Aller au contenu principal
FR

Jessica BOUCHEZ

Villeneuve d'Ascq Cedex

Bâtiment: Building: E

Bureau: Office: 109

Qui contacter en cas d'absence: In case of emergency:
Olivier DELAFRAYE

Jessica BOUCHEZ

- Gestion des publications,  visibilité des publications et des chercheurs,  identité numérique
scientifique..), culture de diffusion en accès libre

- Administration de l'archive institutionnelle Madis

-Administration du portail Hal Univ-Eiffel

- Politique de signature des publications

- Repérage des publications, fourniture d'indicateurs bibliométriques

- Fonds documentaire du Campus de Lille

-ITRD

Mes dernières références

My latest references

UMRESTTE test


publi test


pierre rss

HAL : Dernières publications

  • [hal-00850910] Energy consumption induced by operation phase of railways and road infrastructures

    Up to now, transport systems have mainly been designed by considering time-efficiency, mobility and safety criteria. Today hard constraints on resources savings and environment preservation have to be taken into account at the different phases of design, maintenance and operation of these networks. This study, focused on the operation phase, aimed to provide a common framework for rail and roads energy consumption assessment. For that, the influence of infrastructure characteristics on energy consumption of vehicles was assessed, in a optimization perspective. A method for energy consumptions evaluation by exploiting contact forces models was proposed. Two models were developed, for a road and for a railway, and validated with experimental data of a vehicle on a test track and full-scale measurement of a high speed train on a given line. At last, numerical simulations are worked out with the validated models to exhibit the influence of successions of uphill and downhill on energy consumptions. These simple mechanical models pointed out the differences of the two transportation systems, in terms of developed contact forces and consumed energy.

  • [hal-02193741] Overview of Solutions for Reducing CO2 Emissions during the Use Phase of Passenger Cars

    Road transport largely dominates the transportation demand and energy consumption. Passenger light-duty vehicles (passenger cars and light trucks) are responsible for almost half of the energy consumption of road transport. This energy is mainly supplied by fuels produced using oil resources, increasingly difficult and expensive to exploit. The use of these fuels also generates greenhouse gases, mainly carbon dioxide. This paper analyzes and compares strategies from different domains – the vehicle, the driver and the environment – for reducing carbon dioxide emissions from the use phase of passenger cars. This analysis is based on a general litterature review primarily focused on strategies applicable to OECD countries. A framework for classifying these strategies and the interactions between measures coming from different domains is proposed. The results highlight the possibilities of integration between domains that remain unexplored and that could bring significant gains in terms of emissions reductions.

  • [hal-04312243] Modeling Exposure to Mobility-Related Pollution: Review and Key Challenges

    The health and equity issues related to urban pollution, coupled with the need to assess the consequences of implementing transport policies or new mobility solutions, make it imperative to provide decision-makers with a relevant modeling framework. The coupling of activity-based travel models with environmental models presents a promising approach to thoroughly investigate the interconnected issues related to the impact of road traffic on individual exposure to noise and air pollution. Integrated modeling chains provide a robust framework to comprehensively assess traffic scenarios on a city scale and address issues related to environmental inequalities. This article reviews the recent work in this field to identify both the main contributions and key challenges still to be addressed. It illustrates how the use of a dynamic approach, which considers the intraday dynamics of individual mobilities and pollution concentrations, can contribute to more accurate estimates of the exposure of individuals to pollutants. This modeling approach also has the potential to investigate how the level of exposure depends on the characteristics of the individuals (socioeconomic factors, commuting patterns, location of residence, and main activities). Nonetheless, there are still important challenges to overcome to further enhance the accuracy and applicability of these models: taking into account all types of traffic and transport modes; refining the modeling of exposure to pollution during travel; taking better consideration of microenvironments; and so forth.

  • [hal-04312241] Experimental assessment of wind influence on high-speed train energy consumptions

    Ifsttar and RFF have developed an energy model of high-speed trains in order to determine the influence of infrastructure geometry and environment on train power consumptions. Validation of this model is based on full scale tests performed for the Rhine-Rhone high-speed line acceptance of work (in 2011). This paper aims to evaluate if wind influence is a relevant parameter for the model. This involves numerical determination of aerodynamic coefficients for various wind and ground configurations and their use for the calculation of the aerodynamic efforts. Atmospheric characteristics are extrapolated from meteorological measurements thanks to the AROME numerical model, over the whole Rhine-Rhone line. Most remarkable results show for a moderate train speed (about 47 m/s), a rearward oriented wind of only 5,5 m/s lowers by 30% the power due to aerodynamic forces applied on the train, or raises it similarly if it is forwardly oriented. In conclusion, this work points out that wind influence is of first importance for computing energy consumption.

  • [hal-04312233] Influence of railway gradient on energy efficiency of high speed train

    In the context of reducing the global energy consumptions in transport systems, railways offer many advantages. Therefore the construction of new high speed railways has been planned. This article assesses the impact of the gradient of the railway on the train energy efficiency. This key parameter has a direct influence on the construction and operation phases energy amounts, since low gradients could require considerable civil engineering works. The energy model of the railway operation phase presented in this paper takes into account the infrastructure geometry, the train characteristics and the speed profiles. It is applied to different generic cases in order to illustrate the impact of the infrastructure gradients. The corresponding trajectories are compared from an energy efficiency point of view. Results show that the gradient is not the only one element to take into account. The associated length of ramp or slope is crucial too. For example, it is shown that short section with an important gradient can require less operation energy than lower gradient on longer distances. It is therefore possible to determine a couple of slope/ramp length and gradient for a given rolling stock which contributes to the minimization of the global construction cost and of the operating energy consumption.

  • [hal-04298022] The Use of FTIR Spectroscopy as a Tool for the Seasonal Variation Analysis and for the Quality Control of Polysaccharides from Seaweeds

    Macroalgae are a potentially novel source of nutrition and biologically active molecules. Proliferative species such as Eucheuma denticulatum, Solieria chordalis (red algae) and Sargassum muticum (brown alga) constitute a huge biomass that can be exploited. In this study, we focus on the extraction of polysaccharides from these three macroalgae species and the characterization of cell wall polysaccharides such as carrageenans, fucoidans and alginates by Fourier Transform Infrared spectroscopy with Attenuated Reflectance Module (FTIR-ATR). The comparison of purified extracts with commercial solutions of fucoidans, alginates or carrageenans shows a strong similarity between the spectra. It demonstrates that the methods of extraction that have been used are also suitable purifying technics. Moreover, it validates infrared spectroscopy as a quick, simple and non-destructive method for the accurate analysis of polysaccharides. The FTIR technique applied to samples collected at different periods of the year allowed us to highlight differences in the composition of fucoidans, alginates and carrageenans. Different classes corresponding to the season can be distinguished by statistical multidimensionnal analysis (Principal Component Analysis) showing that the structure of algal polysaccharides, related to bioactivity, depends on the period of harvest. FTIR results showed that S. chordalis and E. denticulatum possess a dominant type of carrageenan called iota-carrageenan. This type of carrageenan is in the majority when the alga is at maturity in its development cycle. During its growth phase, iota-carrageenan precursors can be detected by FTIR spectra, enabling a better control of the extraction and an application of these compounds in various economic sectors. When the alga E. denticulatum is in its juvenile stage, we found traces of kappa-carrageenan and nu-carrageenan polysaccharides in some extracts.

  • [hal-02469476] Fractionation of fish protein hydrolysates by ultrafiltration and nanofiltration: impact on peptidic populations

    The production by enzymatic treatment of fish protein hydrolysates (FPH) is a promising route to add value to fisheries proteinic co-products (fish frames, heads etc.). Indeed, FPH possess good nutritional properties and biological activities for food and feed uses. Pressure-driven membrane separations such as ultrafiltration (UF) and nanofiltration (NF) can be used after the hydrolysis to increase the specific activities of the FPH. This paper discusses the impact of a two-step UF/NF process producing four different fractions on two industrial FPH with different hydrolysis degrees. Fractionation is carried out in “realistic” conditions for an industrial process, on highly concentrated FPH solutions (about 100 g of dry matter/L) at a high volume reduction factor. For each step, UF or NF, the variation of the permeation flux in the course of the fractionation is discussed according to the FPH hydrolysis degree and the membranes cut-offs. The values of performance indicators defined in terms of nitrogen content are also examined, including the concentration factor (CF), the relative recovery in the retentate (ηR) and the mean and final retention factors (RFm and RFf). Computed values of these indicators are validated through the setting of volume and mass balances around each step. The impact of fractionation on the FPH peptidic population is shown. Peptidic populations are described in terms of chromatographic profiles (SEC–FPLC). The UF fractionation produces a permeate enriched with respect to the FPH smaller than a molecular weight of about 600–750 Dalton, and a retentate enriched in large peptides (above the same MW). A similar behaviour is found for the NF fractionation. Comparing the impact of the UF fractionation on the two hydrolysates allows to conclude that the membrane cut-off is well-suited when comprised between the MWs of the biggest and the most abundant peptides in the FPH.

  • [hal-01614736] Seasonal Variation of Sargassum Muticum Biochemical Composition Determined by Fourier Transform Infra-Red Spectroscopy

    Proliferation of the introduced brown macro alga Sargassum muticum is known as a natural and hard to control phenomenon occurring along the Atlantic coasts. The phenomenon causes serious troubles for local ecosystems including the alteration of ecosystem structure, the reduction in indigenous biodiversity and economic losses (tourism, aquaculture). However, despite the serious troubles caused by S. muticum, this species contains highly remarkable bioactive metabolites. This macro alga is at present under-exploited and the valorization of its metabolites to give a positive value to this seaweed could be a solution of ecosystemic service. Biorefinery process could be one solution to valorize S. muticum. Comprehensive knowledge concerning the biochemical composition of S. muticum and the impact of environmental factors, particularly seasons, on its composition is a prerequisite before its valorization. In this study, the biochemical composition of S. muticum was evaluated by using classic colorimetric methods based on chemical analysis and Fourier Transform Infra-Red spectrometry (FTIR), and was used as a rapid and safe method that could bring advantages in screening studies and a more comprehensive management and use of seaweed products. Our results are globally in accordance, notably for phenolic compounds, showing the relevance of the use of infrared spectrometry. Moreover, based on the absorption bands of some specific and valuable compounds shown by FTIR, there was a seasonal variation in the polysaccharides, i.e., uronic acids and sulphated compounds, together with phenolic contents of S. muticum.

  • [hal-04030611] Enhancement of Vehicle Eco-Driving Applicability through Road Infrastructure Design and Exploitation

    Energy moderation of the road transportation sector is required to limit climate change and to preserve resources. This work is focused on the moderation of vehicle consumption by optimizing the speed policy along an itinerary while taking into account vehicle dynamics, driver visibility and the road's longitudinal profile. First, a criterion is proposed in order to detect speed policies that are impeding drivers' eco-driving ability. Then, an energy evaluation is carried out and an optimization is proposed. A numerical application is performed on a speed limiting point with 20 usage cases and 5 longitudinal slope values. In the hypothesis of a longitudinal slope of zero, energy savings of 27.7 liter per day could be realized by a speed sign displacement of only 153.6 m. Potential energy savings can increase to up to 308.4 L per day for a −4% slope case, or up to 70.5 L per day for an ordinary −2% slope, with a sign displacement of only 391.5 m. This results in a total of 771,975 L of fuel savings over a 30 year infrastructure life cycle period. Therefore a methodology has been developed to help road managers optimize their speed policies with the aim of moderating vehicle consumption.

  • [hal-03676872] Statistical analysis of fluvial trajectories based on AIS database for the construction of a bridge

    The French metropolis, Rouen Normandie, has a project of a new bridge requiring temporary pier in the river Seine during the building phase. The location of this pier in the river is constrained by mechanical reasons related to the construction of the bridge. The purpose of this study is to find a position of this pier in the mechanically constrained area which minimizes vessel traffic obstruction and therefore collision risk. This type of study is classically carried out by using complex and multiple vessel dynamics simulation software in order to assess the risk for a given vessel to crash into the pier. The novelty of this study is to propose a statistical study based on the database of Automatic Identification System (AIS) of the Vessel Traffic Service (VTS) that is an automatic tracking system relying on ships transceivers. The technical objective is to identify low risk areas according to vessel speeds and sizes. Both factors should have an impact on the maneuverability of ships to avoid pier collision risk. Among all trajectories, straight line trajectories are selected based on statistical methods. The computation of prediction intervals of these trajectories delimits navigation zone. If all the straight trajectories are taken into account, the navigation zone extends to the whole river surface, which is not an helping result. However, by focusing on large and high speed vessels trajectories the navigation zone of these weak maneuverable ships is more centered in the middle of the river and represents only 25% of the river area. The complement of this area delineates possible locations of the temporary pier of the bridge in the river that do not disrupt vessel traffic.

  • [hal-03675707] Road safety assessment in curves based on a road embedded tire to road friction sensor

    Road safety relies mostly on available tire to road grip regarding to the forces required by a vehicle in a given dynamic situation. For example safety issues can occur when deceleration required forces exceeding the tire/road grip potential. Issues are much critical while traveling in a curve with a coupled longitudinal/transverse grip demand. Instrumented vehicles can be used in order to evaluate the available tire to road grip in rolling situations, but it remains linked to a dedicated vehicle and models have to be use to extrapolate these evaluations to various vehicles. The aim of this work is to propose a sensor embedded in the road infrastructure to evaluate the longitudinal and transverse grip demand of any traveling vehicle. A 6 axis sensor is embedded in a road test track, under a piece of the real road upper layer. Measurement are made at a acquisition rate of 2500 Hz and forces measuring ranges are of 2500 daN (vertical axis) and 750 daN (tangential). Measurements are compared to on-board measurement with a vehicle instrumented with dynamometric wheels. Three situations are experienced in a 100 meters curve: traveling at a given speed and traveling while accelerating or braking moderately, and for three vehicle speeds of 40, 60 and 80 km/h. Force evaluation from the two systems are differing of only 5% for the vertical force and 10% for the tangential forces. The differences are lower for the higher grip demands. For example moderate braking from 70 km/h in curve lead to 0.23 and 0.25 longitudinal friction coefficients (LFC) for road sensor and dynamometric wheel, and to 0.17 and 0.19 transversal friction coefficients (TFC). In perspectives, evaluations of an excessive grip demand could result in solutions as lowering the designed speed or improving the road surface layer.

  • [hal-01346110] Valorization of the macroalga Sargassum muticum by enzymatic hydrolysis. Interest of surfactants to improve the extraction of phlorotannins and polysaccharides

    [...]

  • [hal-03262825] Optimisation of road speed-sectioning by assessing the impact of a road speed limitation sign

    Energy consumed by road vehicles has a high impact on climate changes; indeed this energy use accounts for 23% of total energy-related Green House Gases (GHG) emissions of 2014 global GHG emissions. GHG emissions are growing constantly year after year, in spite of global objectives (COP) and researches on vehicle efficiency and modal shift. The contribution of the infrastructure to lower this energy is less studied, since it is often seen as immuable or too costly. This paper aims to demonstrate that simple and low-cost solutions exist for that purpose. Particularly a methodology has been developed, based on an optimization of the speed layout over an itinerary in order to improve the eco-driving potential of a given road infrastructure. The key point of this work is that inconsistency often exists between vehicle dynamics, road longitudinal profile and changes in regulation speeds. These changes in speed are defining the speed-sectioning of a route, and an optimization of this speed-sectioning can be easily carried out while displacing or modifying speed signs. The objective of this study is to build an optimized speed sectioning which minimizes the fuel consumption for realistic traffic and various driver behaviours, while maintaining the required safety levels. A progressive optimization loop has been worked out with a Python script including an embedded microscopic road traffic simulator. As a result an optimized speed-sectioning is leading to a gain of 227 ml for 60 minutes of simulated flow of 100 veh/h/lane, for a modification of a single speed changing point. The overall benefits are reduced energy consumption, air pollution and noise which otherwise would have been produced by braking. This work brings an effective optimization tool for road managers and its practical application is passive and inexpensive. This methodology is suitable for rural and urbanized territories and easily adaptable to any type of traffic in various countries. In perspectives, the optimization process could be extended to a full road route and to a wide range of different speed-sectioning layouts.

  • [hal-03262747] Simulation of road speed-sectioning by assessing the impact of traffic and road infrastructure

    In a context of climate change, lowering road vehicles consumption is a key point to meet CO2 reduction requirements. In addition to car technological advances, eco-driving is part of the solution but the road infrastructure should ensure its development. In a previous study, a gain of 5% in the spent energy was estimated on specific route by slightly moving some speed signs, but under the assumptions that drivers practice eco-driving and the traffic is free-flow. This paper deepens and widens these first results. The base of this research is to provide a simulation model to study the impact of traffic and speed-sectioning on the environment. Inside this model, the impact of different approach speeds to a speed-sectioning is assessed. The simulation is conducted within the Trafficware Synchro environment where parameters according to road infrastructure, vehicle and driver are based on real traffic data. Moving a speed limitation sign can contribute to a reduction of fuel consumption up to 8% depending on driver structure. This new methodology improves the accuracy of our first results and detects adverse effects as the possible emergence of congestion due to the modification of speed sectioning. In perspective this methodology represents a significant argument in road managers strategy. In addition it also represents an orienting point to investigate different action scenarios and a first step to a global optimization policy in managing road infrastructure.

  • [hal-02303574] Management of road speed sectioning to lower vehicle energy consumption

    Efforts to limit climate change should concern the transportation sector which is responsible for roughly a quarter of greenhouse gas emissions. Aside from vehicle's technical progress and driver eco-driving awareness, road infrastructure has a role to play in this environmental aim. At the project stage, the design of roads can avoid energy losses linked to marked ramps, but afterwards, during the use phase, road management can be a lever too. In this use phase framework, our paper is focused on energy saving that can be achieved by managing speed sectioning. The key point is to ensure consistency between vehicle dynamics, road longitudinal profile and speed policy. Indeed, eco-driving could be impeded if a limiting speed sign is encountered on a steep slope or in a sharp turn. In such a situation the speed sign will be qualified as misplaced. Mechanical braking has then to be used instead of simple natural deceleration. In 2018 the French government lowered authorized speed on secondary roads, from 90 to 80 km/h, with road safety as the primary motivation. In order to assess energy impact of speed-sectioning for these two speed limits, experiments have been carried out in four experimental sites. Furthermore criterion and dissipated energy computation have been developed. The developed energy computation yields to determine the expected fuel economy for the entire traffic over a day on a selected route or network. As a result, over consumption for a misplaced speed sign can reach up to 40 liters of fuel per day with an approaching speed of 80 km/h and 50 liters of fuel per day with an approaching speed of 90 km/h according to traffic data. Significant energy savings could therefore be achieved by sign placement optimization.

  • [hal-02005356] Longitudinal profile optimization for roads within an eco-design framework

    This paper proposes a methodology to optimize the longitudinal profile of roads according to either an energy consumption or Global Warming Potential (GWP) criterion calculated for both construction and operation phases. For the construction phase assessment, this methodology is based on a earthworks model that computes the geometric differences between the natural terrain and the longitudinal road profile and moreover uses environmental data validated with real experiments. The operation phase is assessed by simulating traffic over a ten-years period. Traffic simulations are based on vehicle dynamic models, also validated with real experiments. The optimization problem is set up in a finite dimensional optimization. A case study illustrates this methodology. By taking into account actual traffic measurements, the optimized profile decreases by 6% the total primary energy consumption and by 8% the GWP.

  • [hal-03027667] Initiative ciblée VibraSimu - Rapport final

    Le projet VibraSimu, financé par la direction scientifique de l'IFSTTAR, a été conduit de 2017 à 2019 par trois laboratoires de l'établissement : le Lepsis, Ease et le LPC. Le projet vise à mesurer les vibrations d'un vélo, à les modéliser et les reproduire sur simulateur immersif et enfin, à en évaluer l'impact sur le ressenti des participants. Le projet offre ainsi une meilleure connaissance des vibrations transmises au vélo et au cycliste lors de la circulation sur différents revêtements et améliore le simulateur vélo de l'institut en produisant les vibrations liées aux irrégularités de la chaussée. Il montre également la limite des dispositifs grand public (smartphones) pour mesurer ces vibrations.

  • [hal-02987426] Overview of strategies for reducing co2 emissions during the use phase of passenger cars

    [...]

  • [hal-02868022] Vehicle energy savings by optimizing road speed-sectioning

    In a context of decreasing resources and of climate change, lowering road vehicles consumption is a key point to meet CO2 reduction requirements. In addition to car technological advances, eco-driving is part of the solution but the road infrastructure should ensure its development. This work aims to demonstrate that road energy demand and associated pollutant emissions can be reduced by working out minor optimization of road infrastructure itself. For this to happen, a simple eco-driving potential criterion is built upon infrastructure parameters such as slopes and sight distances. This criterion aims to detect Misplaced Speed-sectioning Positions (MSP) with regard to the Starting Point of Deceleration (SPD); with speed-sectioning being the succession of speed changes along a given route. An enhanced energy waste formulation is then developed to quantify the vehicles energy waste due to misplaced road-signs. Thirdly, a traffic simulation constitutes a framework for energy evaluation; considering a full flow of vehicles, based on real traffic data, and by modeling several driver behaviors. Simulation results show that a significant fuel reduction of up to 5.5% can be achieved locally, simply by moving a road sign, for rural areas and without degrading road safety.

  • [hal-02613238] Comparison of Different Membrane Filtration Systems for Recovering Active Phenolic Compounds from the European Spread Macroalga Sargassum muticum

    Sargassum muticum is an invasive macroalga that uncontrollable widely grows on the European Atlantic coasts. This macroalga is particularly rich in phenolics (phlorotan-nins) presenting biological activities such as antioxidant, radical-scavenging, antibacte-rial, photoprotective properties, etc. Among the diversity of metabolites produced by the species, phenolic compounds could constitute one of the potential ways of valorization of Sargassum muticum.For the needs of the study, algae were harvested along a latitudinal gradient in Norway, Ireland, France, Spain and Portugal.After extraction, the highest phenolic contents and bioactivities were measured for the samples coming from Norway and Portugal. Consequently, both these countries have been retained in the present work.The extracts are composed of a “pool” of phenolic compounds of molecular weight varying, according to the literature, from 126 Da (phloroglucinol) to 650 kDa. But the most common compounds are comprised between 10 and 100 kDa. With the aim of concentrating and eventually fractionating (i.e. isolating the most active fractions) the phenolic extracts of Sargassum muticum, a few membranes of Molecular Weight Cut-Off 10 kDa were chosen. These membranes were tested by using different technologies: ultrafiltration, centrifugal tube and dialysis.Results show that there is no significant activity in the permeates signifying that the retention rate is about 100 % for the active fractions. Concerning the retentates, results show clearly an increase of the total phenolic contents as well as antioxidant and radical scavenging activities. The best performances are obtained with the centrifugal tubes using 10 kDa membranes.

  • [hal-02482046] Analyse de trajectoires fluviales à partir de données SIA pour la conception d’une passerelle

    La Métropole Rouen Normandie souhaitait concevoir une nouvelle passerelle nécessitant des appuis provisoires en Seine. Aussi a-t-elle sollicité l’Ifsttar pour conduire une étude statistique des données de trajectoires, afin de définir les fuseaux de mobilité des navires en fonction notamment de leur vitesse et de leur gabarit, deux facteurs susceptibles d’avoir un impact sur la manoeuvrabilité des navires. Le traitement des données au format SIA a nécessité de recourir à des outils dédiés aux gros fichiers de données. Puis un modèle de régression linéaire a été retenu pour l’analyse des trajectoires rectilignes hors manoeuvres d’accostage. La détermination d’intervalles de prédiction a permis de délimiter les zones de navigation, et donc de mettre en évidence les surfaces du fleuve aptes à accueillir les appuis provisoires.

  • [hal-02469451] Application of Response Surface Methodology to Optimise the Antioxydant Activity of a Saithe (Pollachus Virens) Hydrolysate

    The objective of this study was to produce, by an enzymatic hydrolysis process at a pilot scale, a saithe (Pollachius virens) hydrolysate with a high antioxidant activity. Design of experiment methodology, based on laboratory-scale experiments, was used to obtain a behavioral reduced model that allows one to determine the optimal operating conditions maximizing the antioxidant activity. Two specifications were studied: the degree of hydrolysis and the antioxidant activity. The effects of the following hydrolysis parameters (temperature, pH, enzyme concentration, and operating time) were studied and presented as response surfaces. From these results, a multifactorial optimization was performed and the Pareto optimal set of efficient solutions was evaluated. The optimal conditions were tested at laboratory scale and then validated by comparison with tests carried out on a pilot plant.

  • [hal-02469398] Performances of ultrafiltration membranes for fractionating a fish protein hydrolysate: Application to the refining of bioactive peptidic fractions

    Ultrafiltration membranes can be advantageously used to improve the bioactivity of a saithe protein hydrolysate containing peptides having a size lower than 7 kDa, by fractionating or concentrating some specific molecular weight peptide classes. The aim of this study is to evaluate the behaviour of a 4 kDa membrane in modified polyethersulfone in conditions close to industrial exploitation. This work consists in evaluating the effect of the initial peptide content (30, 90 and 150 mg/mL), the transmembrane pressure (10 and 30 bar), in total recycling modes and the volume reduction factor (until 5) on membrane performances, in terms of permeation flux and selectivity. The peptide content and mass repartition profiles are measured by size exclusion chromatography.It is observed that the pressure and the peptide content, which can act as complementary or antagonist factors, can be adjusted to modify the transmission of peptides and consequently the apparent molecular weight cut-off (MWCO) of the membrane. These results have been directly applied to study the refining of a peptidic fraction lower than 1 kDa having a potential bioactivity (i.e. antioxidant and hypotensive). The change in refining performances with the volume reduction factor (VRF) are discussed, including the recovery yield and the purity of the interesting fraction in permeate and the energy requirements.

  • [hal-02336441] Influence de la saisonnalité sur la composition biochimique de Sargassum muticum, estimée par spectrométrie Infra-Rouge.

    [...]

  • [hal-02115032] Total phenolic content and biological activities of enzymatic extracts from Sargassum muticum (Yendo) Fensholt

    Seaweeds are potentially excellent sources of bio- active metabolites that could represent useful leads in the de- velopment of new functional ingredients in pharmaceutical and cosmetic industries. In the last decade, new marine bioprocess technologies have allowed the isolation of sub- stances with biological properties. The brown alga Sargassum muticum (Yendo) Fensholt (Ochrophyta) was en- zymatically hydrolyzed to prepare water-soluble extracts by using six different commercially available carbohydrate- degrading enzymes and two proteases. Evaluation of 2,2- diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antiox- idant power (FRAP) antioxidant, tyrosinase, elastase, and bio- film inhibition, antibacterial and antiviral activities as well as evaluation of cytotoxicity were realized for each extract. Total phenolic content was measured for extract characterization, and solid-phase extraction was useful to purify the enzymatic extract. Soluble total phenolic content of S. muticum Viscozyme extract was highest with 6.4% of dry weight. Enzymatic Celluclast and Viscozyme extracts had the lowest value of DPPH IC50 indicating a strong antiradical activity, 0.6 mg mL−1, in comparison with other enzymes. The ferric reducing antioxidant power ranged between 48.7 μM Fe 2+ Eq, digested with Viscozyme, and 60.8 μM Fe 2+ Eq, digested with Amyloglucosidase. Tyrosinase inhibition activity of S. muticum Neutrase extract was 41.3% higher compared to other enzymes. Elastase inhibition activity of S. muticum Shearzyme extract had highest activity (32.8%). All enzymat- ic extracts showed no cytotoxic effect towards the kidney Vero cells. Meanwhile, only S. muticum Neutrase and Alcalase ex- tracts exhibited potential antiviral activity. In addition, S. muticum Viscozyme and Shearzyme extracts showed prom- ising activity in suppressing the biofilm formation against Pseudomonas aeruginosa and Escherichia coli, respectively. Purification of S. muticum Viscozyme extracts by solid-phase extraction managed to concentrate the phenolic content and improve the bioactivity. These results indicate the promising potential of enzyme-assisted followed by solid-phase extrac- tion in recovering phenolic content and in improving its bioactivity.

  • [hal-02081082] Ecodriving potential of roads according to their speed sectioning : Bosnia and France cases

    Eco-driving is an efficient way to preserve energy resources and limit environment impacts. It is first of all a question of driver behaviour and motivation, vehicle characteristics, but infrastructure parameters could favour - or impede- ecodriving. This study aims to qualify this infrastructure influence, for the speed sectioning parameter of roads. A research evaluating the adequacy between speed changes along a route, vehicle dynamics and the road gradient constitute the frame of this work. Indeed this adequacy has been proven to be descriptive of the ecodriving potentiality of a route, as detailed in a previous experimental evaluation in France (Coiret et al [8]). It is reinforced here with the help of experimental evaluation in Bosnia, with a metro-logical reinforcement : differential gps, temporal tagging system at points of interest, roof anemometer for the influence of wind, is now used to have more accurate data. In particular the better altitude measurements increase results quality, with achievable reductions of 5 % of energy consumptions for given route sections with sectioning optimisation (ie : simple speed limit panels repositioning) We have also researched crucial points on how to compare different countries and their legislation, geography, and traffic conditions. Bosnia and Herzegovina and France are in the context, to indicate that an assessment of quality level in eco-driving of the two countries is taken in consideration. Perspectives are given in terms of traffic software generalization of the experimental results and in terms of speed sectioning revisions in order to reduce linked energy losses and CO2 emissions. A route model could then be evaluated, for which speed-sectioning and positioning of amenities (speed bumper, traffic lights) could be optimized in energy use of infrastructure, with a concern not to alter the security features.

  • [hal-02012129] Model of High-Speed train energy consumption

    The current transport system is not sustainable because of its high consumption of finite resources (mainly oil) and its impact on the environment (air quality, global warming, etc.). In this context, rail has several advantages: lower consumption and emissions than road and air modes, larger passenger flow, etc. That is why, many rail infrastructures are planned in the world. Today, the impact of energy is not taken into account during the project design. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-01741653] Model of high-Speed Train Energy Consumption

    The current transport system is not sustainable because of its high consumption of finite resources (mainly oil) and its impact on the environment (air quality, global warming, etc.). In this context, rail has several advantages: lower consumption and emissions than road and air modes, larger passenger flow, etc. That is why, many rail infrastructures are planned in the world. Today, the impact of energy is not taken into account during the project design. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-01670595] Évaluation de l’adhérence de pneumatiques sur pistes comme un paramètre de la sécurité des métros automatiques

    Les métros automatiques, sans conducteurs, sont en déploiement important depuis des décennies et offrent de hauts niveaux de service et de sécurité. S’affranchir du facteur humain peut en effet augmenter ces niveaux en exploitation courante mais des protocoles robustes de commande sont alors requis pour pallier l’absence des qualités humaines d’anticipation et d’adaptation en situations exceptionnelles. De tels protocoles, dits d’anti‐collision, sont généralement basés sur une performance minimale de freinage garantie associée à un découpage de l’infrastructure en cantons, fixes ou mobiles, assurant qu’il ne puisse y avoir simultanément plus d’un véhicule sur le même canton. En particulier, un système de métro automatique sur pneu est présenté dans cet article. Des résultats d’essais de freinage de rames montrent l’efficacité de traitements visant à améliorer l’adhérence pneumatique/piste de roulement. L’entretien des pistes pour maintenir un bon niveau de freinage est discuté pour les techniques courantes de striage et de grenaillage des pistes. Enfin, une méthodologie pour permettre le suivi des pistes en temps et en espace est proposée. Elle inclut la sélection et l’emploi de matériels d’évaluation de l’adhérence issus du domaine routier.

  • [hal-01631564] Étude de trajectoires fluviales pour la métropole Rouen Normandie

    Rouen métropole a sollicité les capacités de l'Ifsttar dans le domaine du traitement du signal appliqué à l'usage des infrastructures à travers un courriel envoyé le 1er mars 2017 par M Toynan, responsable du service Ouvrage d'art de la métropole de Rouen, à MM Coiret et Vandanjon, chercheurs à l'Ifsttar. Cette sollicitation concerne un ouvrage en projet pour le franchissement de la Seine. L'ouvrage sera de type léger, sous la forme d'une passerelle dédiée aux modes doux (cycles, piétons). Il complètera l'offre de franchissement existante et reliera efficacement des pôles générateurs de déplacements dans l'agglomération, et notamment l'Ecoquartier Luciline en cours de réalisation en rive droite et l'Ecoquartier Flaubert en projet en rive gauche dans le cadre du projet global Seine Cité. L'ouvrage est donc envisagé dans le secteur Ouest de l'agglomération rouennaise, entre les ponts Guillaume Le Conquérant et Gustave Flaubert, soit en traverse de la partie de Seine accueillant régulièrement la grande Armada. Les appuis principaux de la structure seraient situés dans l'alignement des hangars existants. La structure provisoire dite > sera déconstruite préalablement aux travaux de passerelle. A ce jour, il n'est pas envisagé d'implanter d'appui définitif en Seine. Néanmoins, le recours à des appuis intermédiaires en phase réalisation semble incontournable. De même, la définition d'un gabarit de passe navigable influe sur la définition de la limite basse d'intrados d'ouvrage et donc sur la définition des accès. Seule une connaissance plus précise des trajectoires fluviales entre le Pont Guillaume le Conquérant en amont et le Pont Flaubert en aval permettra donc de gagner en précision sur la définition des implantations possibles d'appuis provisoires puis sur la définition du gabarit fluvial définitif. À cet effet, l'Ifsttar a été sollicité pour une étude statistique de trajectoire de navires, selon un cahier des charges qui est donné en annexe au présent document. L'Ifsttar a répondu à ce cahier des charges en rédigeant une proposition technique, également en annexe à ce document, dont le produit est un rapport d'étude sur les trajectoires fluviales sur la section considérée. Une réunion de lancement a eu lieu le 11 mai 2017 dans les locaux de Rouen métropole. Ce document est la troisième version de ce rapport d'étude. Une première version a été envoyée le 17 juin afin d'échanger avec la Métropole Rouen Normandie. Ce document a été le support d'une réunion téléphonique avec la métropole de Rouen le 27 juin afin, notamment, de préparer une réunion entre la métropole et le grand port maritime de Rouen. Nous avons abouti à une deuxième version envoyée le 3 juillet 2017 afin de fournir des données opérationnelles pour la métropole. Suite à des relectures internes, nous avons modifié cette deuxième version en améliorant sa forme afin d'aboutir à cette version qui est remise lors de la réunion de présentation des résultats du 11 juillet 2017. Ce rapport est découpé en 10 chapitres. Tout d'abord, la structure des données, que nous avons obtenues par le port maritime, est expliquée. Les grandes étapes du traitement de ces données sont présentées dans le chapitre suivant. Puis, les résultats de ce traitement sont affichées sous forme de graphiques pour chaque trimestre de l'année 2016 dans les chapitres 4 à 8. Enfin, les deux dernier chapitres discutent les résultats et conclut le rapport.

  • [hal-01470518] Pistes cyclables et innovation dans les marchés publics

    Nova'TP, commission TP de NOVABUILD, a initié un groupe de travail visant à favoriser l'innovation dans les marchés publics de travaux, grâce à l'élaboration de cahier des charges décrivant les performances attendues plutôt que les moyens de les atteindre. Cette démarche s'est appuyée sur l'exemple concret du choix des matériaux des pistes cyclables, qui sont intégrées à la plupart des aménagements réalisés sur l'espace public. La première étape du projet a consisté à définir les critères objectifs de performance de ces matériaux, afin de répondre aux enjeux de confort, de développement durable, de coût... exprimés par les maitres d'ouvrage. Sur certains critères, comme le confort, l'absence de référentiel existant pour les infrastructures cyclables, nous a conduit à développer une démarche innovante, en adaptant l'usage du Vel'Audit (Îlo instrumenté, prévu initialement pour l'inspection à haut rendement d'aménagements cyclables). Les matériaux déjà couramment utilisés pour ce type d'infrastructure ont été caractérisés selon ces critères. Ces données ont ensuite été regroupées dans une application, développée pour faciliter l'analyse et la comparaison des offres par les maîtres d'ouvrage. Cette application permet de comparer des matériaux conventionnels entre eux ou avec des matériaux innovants sous un aspect performentiel. Ce logiciel d'aide à la décision a été testé par Nantes Métropole sur plusieurs opérations d'aménagement, pour Îrifier sa pertinence et proposer certaines évolutions.

  • [hal-01470514] Transposability of road management devices to the evaluation of comfort and safety of cycling lanes

    Les collectivités françaises développent de plus en plus d'aménagement cyclables, et il apparaît donc plus d'attentes concernant la sécurité de ces aménagements, leur confort, leur durabilité, leur gestion et entretien... Si pour le réseau routier général, les maîtres d'ouvrages disposent d'outils d'aide à la décision, basés sur des critères tels que la sécurité, la mobilité, l'environnement et le coût, les voies cyclables ne sont que partiellement concernées par ces outils. Ce travail vise à répondre aux attentes des gestionnaires de réseaux cyclables et a été réalisé dans le cadre du groupe de travail « Nova-TP » sur l'innovation dans les transports. En première partie de ce travail, L'outil Vel'audit est présenté. DériÎ des outils routiers, Vel'Audit est un Îlo instrumenté qui permet de réaliser des releÎs d'images ensuite exploitables à l'aide du logiciel IREVE. Ce diagnostic permet à la fois de caractériser l'infrastructure et d'identifier des défauts de cyclabilité. Vél'audit dispose aussi d'une centrale inertielle mesurant les vibrations subies par le Îlo et conduisant au calcul d'un indicateur confort indexé à la vitesse d'avancement. Pour l'aspect sécurité, le SRT (Skid Resistance Tester) est ensuite présenté, comme un des moyens de mesure de l'adhérence exploité pour les routes et pouvant être directement transposé aux pistes cyclables. Des essais de validité sur piste cyclable sont ensuite discutés et, en perspectives, le développement d'un matériel utilisable continûment sur itinéraire, inspiré du Grip-Tester, est envisagé en prolongement des mesures ponctuelles du SRT. Ainsi différentes techniques d'auscultations routières éprouÎes peuvent répondre aux besoins émergents des gestionnaires d'infrastructures cyclables, tout en s'adaptant aux caractéristiques de ces déplacements cyclables. Ces transpositions sont encore peu investie alors même que les besoins existent et qu'en finalité cela pourrait aboutir à la construction d'un indice de qualité cyclable (IQCy) à l'image de l'IQRN routier.

  • [hal-01346183] Extraction de composés phénoliques et autres substances d'intérêt contenus dans les algues brunes Sargassum muticum par hydrolyse enzymatique et procédés membranaires

    [...]

  • [hal-01346177] Enzymatic extraction of phenolic compounds in different species of French and Indonesia Sargassum

    [...]

  • [hal-01346174] Influence de la saisonnalité sur la composition biochimique de Sargassum muticum, estimée par spectrométrie IR

    [...]

  • [hal-01346170] Use of membrane systems for recovering phenolic compounds from the invasive macroalgae Sargassum muticum

    [...]

  • [hal-01346168] Biorefining of a proliferative macroalga Sargassum muticum by enhanced enzymatic hydrolysis

    [...]

  • [hal-01346164] Enzymatic extraction of molecules from brown macroalgae

    [...]

  • [hal-01346155] Total phenolic content and biological activity of French Sargassum muticum enzymatic hydrolysates

    [...]

  • [hal-01346137] Biorefining of proliferative macroalgae Sargassum muticum by enzymatic hydrolysis

    [...]

  • [hal-01326825] Ecodriving potentiality assessment of road infrastructures according to the adequacy between infrastructure slopes and speeds limits

    The energy associated with the use of road infrastructure exceeds in few years the energy needed for its construction. The link between infrastructure and use energy has not been, however, studied in depth, particularly as the legitimate transport societal expectations are related to efficiency and safety. However, we can consider reducing the energy use by working out minor optimizations of the road infrastructure itself, which is a major challenge in a context of overall decrease of resources and increasing pressures on the environment. Experimental work is carried out here to develop one of these optimizations by improving the eco-driving potential of roads. It is based on the adequacy between vehicles dynamics, the road longitudinal profile and the speed sectioning of the infrastructure. This sectioning corresponds to the succession of speed limitations (road signs, roundabouts, intersections ...). It may allow drivers to eco-drive or not, depending on dynamics, slopes, and secondary parameters as driver reaction time or distance of visibility. Optimal speed sectioning aims to limit the mechanical braking needed by potential energy reduction, due to slopes, which can be encountered simultaneously with the needed kinetic energy reduction. Evaluation has been made on actual road sections, while recording both vehicle dynamics, driver commands, road signs positions and road longitudinal profile. Results show that energy consumption of vehicles approaching a speed reduction sign can be reduced by moving backward this sign of about 700 meters, without penalizing the primary safety function. The associated gain, for this optimization, has been evaluated to 14 liters of fuel per day for one of the experimental sites, considering traffic data. Application of this method on a network could then lead to considerable energy saving by allowing eco-driving.

  • [hal-01078844] Chemical characterization and photoprotective activity measurement of extracts from the red macroalga Solieria chordalis

    The photoadaptive responses of macroalgal communities to abiotic stresses have been studied, and a number of UV-absorbing molecules have been identified. Among these compounds, photoprotective compounds such as mycosporine-like amino acids and carotenoids have been isolated from various red macroalgal species. However, several substances still need to be characterized. We describe the preparation of photoprotective extracts obtained from Solieria chordalis. Two solvents, 2-octyl dodecanol and octyldodecyl ester of L-pyrrolidone carboxylic acid, were selected based on their cosmetic functions for performing an ultrasound-assisted extraction. The efficiency of extraction was monitored by spectrophotometry and in vitro photoprotective activity measurements. 2-Octyl dodecanol and octyldodecyl ester of L-pyrrolidone carboxylic acid extracts showed maximum absorption wavelengths ranging from 280 to 340 nm and 270 to 350 nm, respectively. The anti UV-B capacity for protecting a synthetic chlorophyll solution was assessed by measuring its pseudo first-order degradation kinetics at room temperature. Under irradiation at 312 nm, chlorophyll introduced in the 2-octyl dodecanol S. chordalis extract showed the slowest degradation kinetics with a half-life t(1/2) of 121.0 min. Several compounds were detected in the seaweed

  • [hal-00960384] Practical guidelines for Life Cycle Assessment applied to railways project

    Current transport systems are not likely to be sustainable, since energy resources may be less accessible, facing a rapidly growing demand and because of environmental constrains. In this context a great interest arose for sharing environmental assessment practices between infrastructures owners and researchers. For this present work a partnership between RFF and Ifsttar was decided to study environmental effects and energy consumption for railways life cycle. It paves the way to a full life cycle analysis (LCA) for environmental burdens of railway infrastructures and aims at identifying the best design practices at the project level related to environmental criteria. This LCA takes into account earthwork, railway structure and the operation phase, i.e., the analysis performed is based on the estimation of energy consumptions due to construction, maintenance and on the traffic. Results of this work could enhance practices for environment preservation for the plan of building 4000 kilometres of new high-speed railways, decided in the French National Transport infrastructure scheme. Applying LCA to the project phase is a rather new approach. It requires defining a global functional unit as a basic hypothesis of any study, different from the previous studies. Then, the lifecycle subsystems are successively investigated (construction, maintenance and use) to determine the best way for project Functional Unit definition and further assessment method application.

  • [hal-00960333] Application of viability theory for road vehicle active safety during cornering manoeuvres

    Viability theory proposes geometric metaphors in addition to classical ordinary differential equation analysis. In this paper, advantages of applying viability theory to road safety domain are presented. The exact issue is to determine if, from an initial state of a vehicle/road/driver system, a soft controls strategy is compatible with a safe driving sequence. The case of a car negotiating a curve is considered. The application of the viability theory to this issue offers the advantage to avoid classical full computing of the system. Instead of that, it consists on verifying that the states and the controls belong to a subset called the viability kernel. The construction and the use of the viability kernel for a vehicle system dynamic is proposed by using support vector machines algorithm. Then, the applicability of this theory is demonstrated through experimental tests. This innovative application of the viability theory to vehicle dynamics with road safety concerns could benefit to robust embedded warning systems.

  • [hal-00943273] Assessment of the spatial variability of phenolic contents and associated bioactivities in the invasive alga Sargassum muticum sampled along its European range from Norway to Portugal

    Sargassum muticum, an invasive brown macroalga presently distributed along European Atlantic coasts from southern Portugal to the south coast of Norway, was studied on a large geographical scale for its production of phenolic compounds with potential industrial applications and their chemical and biological activities. S. muticum can produce high biomass in Europe, which could be exploited to supply such compounds. S. muticum was collected in Portugal, Spain, France, Ireland and Norway (three sites/country) to examine the effect of the latitudinal cline and related environmental factors. Assays focused particularly on polyphenols and their activities. Crude acetone-water extracts were purified using solid phase extraction (SPE) and antioxidant and antimicrobial activities of crude extracts and semi-purified fractions measured. Total phenolic content was assessed by colorimetric Folin-Ciocalteu assay and reactive oxygen species activities by 2,2-diphenyl-1-picrylhydrazyl, reducing power, β-carotene bleaching method and xanthine oxidase assay. Antibacterial activities were tested on terrestrial and marine strains to evaluate potential use in biomedical and aquaculture fields. Purified active phlorotannins, isolated by SPE, were identified using NMR. Phenolic contents differ clearly among countries and among sites within countries. Quality did not change between countries, however, although there were some slight differences in phlorethol type. Additionally, some fractions, especially from the extreme north and south, were very active. We discuss this in relation to environmental conditions and the interest of these compounds. S. muticum represents a potential natural source of bioactive compounds and its collection could offer an interesting opportunity for the future management of this species in Europe.

  • [hal-00914588] Model of high-speed train energy consumption

    In the hardening energy context, the transport sector which constitutes a large worldwide energy demand has to be improving for decrease energy demand and global warming impacts. In a controversial situation where subsists an increasing demand for long-distance and high-speed travels, high-speed trains offer many advantages, as consuming significantly less energy than road or air transports. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-00841179] Green improved processes to extract bioactive phenolic compounds from brown macroalgae using Sargassum muticum as model.

    A comparative study between "alternative" extraction processes such as centrifugal partition extraction (CPE), supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE) and classical solid/liquid used in the laboratory are currently focusing on the efficiency (selectivity and productivity) to obtain bioactive phenolic compounds from the phaeophyte Sargassum muticum model. The choice of the best process was based on several measurements: (i) the total phenolic content measured by the colorimetric Folin-Ciocalteu assay, (ii) radical scavenger and antioxidant activities assessed by the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging assay, and the β-carotene bleaching method and finally (iii) the method productivity. Irrespective of the solvent used in the processes, alternative methods are always sharply more effective than classical ones. With the exception of SFE which does not allow extracting the totality of the active phenolic compounds, two of the other extraction methods were particularly promising. First, CPE afforded the most important yields in concentrated phenolic compounds (PC) (22.90±0.65% DW) also displaying the best activities (0.52±0.02 and 0.58±0.19 mg/mL for IC50 and AAC700, respectively). Secondly, PLE using an EtOH:water mixture 75:25 (v/v) allowed a good PC extraction (10.18±0.25% DW) with huge efficiency. Despite a lesser activity of the extracts (0.77±0.01 and 1.59±0.15 mg/mL for IC50 and AAC700, respectively) PLE is a green process and potentially complies European norms requirements for the prospective valorization of phenolic compounds from S. muticum in Brittany.

  • [hal-00776297] Viability Theory and Road safety

    Viability theory proposes geometric metaphors in addition to classical ordinary differential equation analysis. This theory is applied on a vehicle cornering. The issue is to determine if a state of the system is compatible with a soft controls strategy which leads the car to the end of the corner. The viability theory offers tools which enable to answer to this question without computing in real time these controls. The issue resumes to verify that this state belongs to a set called the viability kernel. The construction and the use of the viability kernel for a vehicle system dynamic is proposed by using Support Vector Machines algorithm. The applicability of this theory is demonstrated through experimental tests. It is the first time that the viability theory is applied to vehicle dynamics with road safety concerns.

  • [hal-00669664] Fractionation by ultrafiltration of a saithe protein hydrolysate (Pollachius virens): Effect of material and molecular weight cut-off on the membrane performances

    Five organic tubular nanofiltration membranes of various material and molecular weight cut-off (MWCO) were tested for the enrichment of a fish (saithe, Pollachius virens) hydrolysate in low molecular weight antioxidant peptides (< 2 kDa). The effect of membrane material and MWCO on permeation flux, hydrolysate adsorption extent, membrane cleaning and peptides retention was investigated in low fouling conditions in order to limit concentration polarization effects. Water permeation fluxes appeared sensitive both to the MWCO and the membrane material. Membranes in polyethersulfone (PES), a highly hydrophobic material, exhibited lower fluxes than modified polyethersulfone (m-PES) and polysulfone (PS) membranes. The 4 kDa m-PES membrane was found to be the most adapted to the objective in terms of flux and retention factor. The 4 kDa m-PES and 8 kDa PS membranes could also be used in series to recover medium-size peptides. (c) 2008 Elsevier Ltd. All rights reserved.

  • [hal-00668508] Impact of ultrafiltration and nanofiltration of an industrial fish protein hydrolysate on its bioactive properties

    BACKGROUND: Numerous studies have demonstrated that in vitro controlled enzymatic hydrolysis of fish and shellfish proteins leads to bioactive peptides. Ultrafiltration (UF) and/or nanofiltration (NF) can be used to refine hydrolysates and also to fractionate them in order to obtain a peptide population enriched in selected sizes. This study was designed to highlight the impact of controlled UF and NF on the stability of biological activities of an industrial fish protein hydrolysate (FPH) and to understand whether fractionation could improve its content in bioactive peptides. RESULTS: The starting fish protein hydrolysate exhibited a balanced amino acid composition, a reproducible molecular weight (MW) profile, and a low sodium chloride content, allowing the study of its biological activity. Successive fractionation on UF and NF membranes allowed concentration of peptides of selected sizes, without, however, carrying out sharp separations, some MW classes being found in several fractions. Peptides containing Pro, Hyp, Asp and Glu were concentrated in the UF and NF retentates compared to the unfractionated hydrolysate and UF permeate, respectively. Gastrin/cholecystokinin-like peptides were present in the starting FPH, UF and NF fractions, but fractionation did not increase their concentration. In contrast, quantification of calcitonin gene-related peptide (CGRP)-like peptides demonstrated an increase in CGRP-like activities in the UF permeate, relative to the starting FPH. The starting hydrolysate also showed a potent antioxidant and radical scavenging activity, and a moderate angiotensin-converting enzyme (ACE)-1 inhibitory activity, which were not increased by UF and NF fractionation. CONCLUSION: Fractionation of an FPH using membrane separation, with a molecular weight cut-off adapted to the peptide composition, may provide an effective means to concentrate CGRP-like peptides and peptides enriched in selected amino acids. The peptide size distribution observed after UF and NF fractionation demonstrates that it is misleading to characterize the fractions obtained by membrane filtration according to the MW cut-off of the membrane only, as is currently done in the literature. Copyright © 2010 Society of Chemical Industry


Pierrebis

HAL : Dernières publications

  • [hal-00850910] Energy consumption induced by operation phase of railways and road infrastructures

    Up to now, transport systems have mainly been designed by considering time-efficiency, mobility and safety criteria. Today hard constraints on resources savings and environment preservation have to be taken into account at the different phases of design, maintenance and operation of these networks. This study, focused on the operation phase, aimed to provide a common framework for rail and roads energy consumption assessment. For that, the influence of infrastructure characteristics on energy consumption of vehicles was assessed, in a optimization perspective. A method for energy consumptions evaluation by exploiting contact forces models was proposed. Two models were developed, for a road and for a railway, and validated with experimental data of a vehicle on a test track and full-scale measurement of a high speed train on a given line. At last, numerical simulations are worked out with the validated models to exhibit the influence of successions of uphill and downhill on energy consumptions. These simple mechanical models pointed out the differences of the two transportation systems, in terms of developed contact forces and consumed energy.

  • [hal-02193741] Overview of Solutions for Reducing CO2 Emissions during the Use Phase of Passenger Cars

    Road transport largely dominates the transportation demand and energy consumption. Passenger light-duty vehicles (passenger cars and light trucks) are responsible for almost half of the energy consumption of road transport. This energy is mainly supplied by fuels produced using oil resources, increasingly difficult and expensive to exploit. The use of these fuels also generates greenhouse gases, mainly carbon dioxide. This paper analyzes and compares strategies from different domains – the vehicle, the driver and the environment – for reducing carbon dioxide emissions from the use phase of passenger cars. This analysis is based on a general litterature review primarily focused on strategies applicable to OECD countries. A framework for classifying these strategies and the interactions between measures coming from different domains is proposed. The results highlight the possibilities of integration between domains that remain unexplored and that could bring significant gains in terms of emissions reductions.

  • [hal-04312243] Modeling Exposure to Mobility-Related Pollution: Review and Key Challenges

    The health and equity issues related to urban pollution, coupled with the need to assess the consequences of implementing transport policies or new mobility solutions, make it imperative to provide decision-makers with a relevant modeling framework. The coupling of activity-based travel models with environmental models presents a promising approach to thoroughly investigate the interconnected issues related to the impact of road traffic on individual exposure to noise and air pollution. Integrated modeling chains provide a robust framework to comprehensively assess traffic scenarios on a city scale and address issues related to environmental inequalities. This article reviews the recent work in this field to identify both the main contributions and key challenges still to be addressed. It illustrates how the use of a dynamic approach, which considers the intraday dynamics of individual mobilities and pollution concentrations, can contribute to more accurate estimates of the exposure of individuals to pollutants. This modeling approach also has the potential to investigate how the level of exposure depends on the characteristics of the individuals (socioeconomic factors, commuting patterns, location of residence, and main activities). Nonetheless, there are still important challenges to overcome to further enhance the accuracy and applicability of these models: taking into account all types of traffic and transport modes; refining the modeling of exposure to pollution during travel; taking better consideration of microenvironments; and so forth.

  • [hal-04214083] Drag force parameters identification for a cargo-bike based on free deceleration measurement

    Identifying the drag force coefficient and the rolling resistance coefficient of a vehicle is not an easy task, especially when not using a wind tunnel. This paper proposes an easy method using light experimental means to assess these coefficients in the case of a cargo-bike. Free deceleration measurement is performed. An identification method based on the least squares method is then proposed and discussed.

  • [hal-04030611] Enhancement of Vehicle Eco-Driving Applicability through Road Infrastructure Design and Exploitation

    Energy moderation of the road transportation sector is required to limit climate change and to preserve resources. This work is focused on the moderation of vehicle consumption by optimizing the speed policy along an itinerary while taking into account vehicle dynamics, driver visibility and the road's longitudinal profile. First, a criterion is proposed in order to detect speed policies that are impeding drivers' eco-driving ability. Then, an energy evaluation is carried out and an optimization is proposed. A numerical application is performed on a speed limiting point with 20 usage cases and 5 longitudinal slope values. In the hypothesis of a longitudinal slope of zero, energy savings of 27.7 liter per day could be realized by a speed sign displacement of only 153.6 m. Potential energy savings can increase to up to 308.4 L per day for a −4% slope case, or up to 70.5 L per day for an ordinary −2% slope, with a sign displacement of only 391.5 m. This results in a total of 771,975 L of fuel savings over a 30 year infrastructure life cycle period. Therefore a methodology has been developed to help road managers optimize their speed policies with the aim of moderating vehicle consumption.

  • [hal-01061188] Méthode à erreur de sortie pour l'identification en boucle fermée des paramètres dynamiques d'un robot à flexibilité localisée, sans mesure de flexibilité

    Ce papier présente une nouvelle méthode à erreur de sortie en deux étapes pour l'identification en boucle fermée des paramètres inertiels, de frottements et de raideur d'un axe de robot avec flexibilité articulaire localisée. Cette méthode utilise uniquement l'effort et la position du moteur, sans aucune mesure de flexibilité. La première étape identifie la fréquence du mode rigide asservi et la fréquence du mode flexible à entrée bloquée, en utilisant un modèle haute fréquence double intégrateur du robot. L'identification utilise une méthode à erreur de sortie sur la position du moteur. Ces deux paramètres de fréquence optimaux sont ensuite utilisés dans la deuxième étape pour l'identification des paramètres dynamiques du robot par une méthode à erreur de sortie sur l'effort moteur. Cette méthode récente (DIDIM) qui utilise les modèles d'identification directe et inverse du robot permet d'obtenir une convergence des paramètres très rapide et insensible aux conditions initiales. Une validation expérimentale sur un robot un axe montre l'efficacité de la nouvelle méthode comparée à deux méthodes à erreur de sortie classiques.

  • [hal-03676872] Statistical analysis of fluvial trajectories based on AIS database for the construction of a bridge

    The French metropolis, Rouen Normandie, has a project of a new bridge requiring temporary pier in the river Seine during the building phase. The location of this pier in the river is constrained by mechanical reasons related to the construction of the bridge. The purpose of this study is to find a position of this pier in the mechanically constrained area which minimizes vessel traffic obstruction and therefore collision risk. This type of study is classically carried out by using complex and multiple vessel dynamics simulation software in order to assess the risk for a given vessel to crash into the pier. The novelty of this study is to propose a statistical study based on the database of Automatic Identification System (AIS) of the Vessel Traffic Service (VTS) that is an automatic tracking system relying on ships transceivers. The technical objective is to identify low risk areas according to vessel speeds and sizes. Both factors should have an impact on the maneuverability of ships to avoid pier collision risk. Among all trajectories, straight line trajectories are selected based on statistical methods. The computation of prediction intervals of these trajectories delimits navigation zone. If all the straight trajectories are taken into account, the navigation zone extends to the whole river surface, which is not an helping result. However, by focusing on large and high speed vessels trajectories the navigation zone of these weak maneuverable ships is more centered in the middle of the river and represents only 25% of the river area. The complement of this area delineates possible locations of the temporary pier of the bridge in the river that do not disrupt vessel traffic.

  • [hal-03675707] Road safety assessment in curves based on a road embedded tire to road friction sensor

    Road safety relies mostly on available tire to road grip regarding to the forces required by a vehicle in a given dynamic situation. For example safety issues can occur when deceleration required forces exceeding the tire/road grip potential. Issues are much critical while traveling in a curve with a coupled longitudinal/transverse grip demand. Instrumented vehicles can be used in order to evaluate the available tire to road grip in rolling situations, but it remains linked to a dedicated vehicle and models have to be use to extrapolate these evaluations to various vehicles. The aim of this work is to propose a sensor embedded in the road infrastructure to evaluate the longitudinal and transverse grip demand of any traveling vehicle. A 6 axis sensor is embedded in a road test track, under a piece of the real road upper layer. Measurement are made at a acquisition rate of 2500 Hz and forces measuring ranges are of 2500 daN (vertical axis) and 750 daN (tangential). Measurements are compared to on-board measurement with a vehicle instrumented with dynamometric wheels. Three situations are experienced in a 100 meters curve: traveling at a given speed and traveling while accelerating or braking moderately, and for three vehicle speeds of 40, 60 and 80 km/h. Force evaluation from the two systems are differing of only 5% for the vertical force and 10% for the tangential forces. The differences are lower for the higher grip demands. For example moderate braking from 70 km/h in curve lead to 0.23 and 0.25 longitudinal friction coefficients (LFC) for road sensor and dynamometric wheel, and to 0.17 and 0.19 transversal friction coefficients (TFC). In perspectives, evaluations of an excessive grip demand could result in solutions as lowering the designed speed or improving the road surface layer.

  • [hal-03500363] Multi-scale spatial analysis of household car ownership using distance-based Moran's eigenvector maps: Case study in Loire-Atlantique (France)

    Analyzing spatial structures of transportation data at various scales can be of prime interest to transportation planning and governance. In recent years, multi-scale spatial analysis methods have been developed and used in fields like ecology and geography, but only a few studies have applied these methods to transportation data. However, such methods can provide an efficient exploratory tool for: identifying those scales at which transportation data vary spatially; modeling the spatial structures at each scale; and determining the processes at work that explain these spatial structures. This paper describes and demonstrates how a multi-scale spatial analysis method, namely distance-based Moran's eigenvector maps (dbMEM), can be applied to study the spatial layout of car ownership. For this analysis, we rely on aggregated census data for small statistical areas within France's Loire-Atlantique administrative region. At first, 176 spatial vectors representing spatial patterns with a positive autocorrelation are constructed. Among the 176 vectors, only 23 significant ones are retained after performing a regression with car ownership as the dependent variable. Next, we divide these spatial vectors into three sub-models representing three spatial scales: broad scale, medium scale, and fine scale. Lastly, we identify a set of sociodemographic factors capable of explaining the spatial variation at each scale, i.e.: the broad-scale variation is mainly explained by population density, couples with children and income variables; the medium scale by couples with children, share of individuals in the 25-54 year age range and income; and the fine scale by couples with children and income variables.

  • [hal-03326458] Simulation d'une population synthétique : méthodologie et cas d'application sur Nantes SNCF TER Mobilités Pays de la Loire - Ifsttar / Livrable 2

    Ce rapport est le deuxième rapport prévu au sein de ce contrat, écrit par l'équipe universitaire à destination de la SNCF dans le cadre de la convention de co-encadrement SNCF/UniversitéGustaveEiffel (anciennement Ifsttar) accompagne cette thèse (No Ifsttar : RP1-E19045) sous la responsabilité scientifique de Jean Calio, expert Data, Mobilité et Territoires et Développement Durable de la SNCF et de Pierre-Olivier Vandanjon.

  • [hal-03282111] Methodology for Adding a Variable to a Synthetic Population from Aggregate Data: Example of the Income Variable

    This paper presents a framework to tackle the problem, which has received little attention in the literature, of adding variables to a synthetic population from aggregate data. The work herein thus enriches the existing literature by proposing a new and e icient methodology to meet this practical need. The methodology integrates three distinct stages, the first of which theoretically models the problem as a multinomial distribution. The addition of a new variable is formulated as an entropy maximization using the variables available in both the synthetic population and aggregate data. Solving this problem (in our specific case study) is not possible due to the large number of constraints involved. The second stage then presents a heuristic yielding a practical solution to the problem. This heuristic combines Bayes' theorem with the cross-entropy minimization algorithm. However, given the large number of parameters to be estimated by the proposed heuristic, some of the results obtained prove to be invalid. To rectify this shortcoming, a post-processing method is applied during a third stage to ensure the consistency of our results. The methodology is described in great detail, and examples are provided for a better understanding of these three stages. Also, this methodology is applied to a real-world case study. An income is allocated to each of the 157 000 households in the French city of Nantes based on aggregate data from the FiLoSoFi database. Income constitutes an essential microsimulation variable for taking many social and economic aspects into account (e.g. household purchasing power, redistribution policy, tax policy). Special attention is also paid to the reproducibility of our results with the databases and R-scripts used, all of which are freely available. This method remains general and is indeed applicable to other variables with available aggregate data.

  • [hal-03262825] Optimisation of road speed-sectioning by assessing the impact of a road speed limitation sign

    Energy consumed by road vehicles has a high impact on climate changes; indeed this energy use accounts for 23% of total energy-related Green House Gases (GHG) emissions of 2014 global GHG emissions. GHG emissions are growing constantly year after year, in spite of global objectives (COP) and researches on vehicle efficiency and modal shift. The contribution of the infrastructure to lower this energy is less studied, since it is often seen as immuable or too costly. This paper aims to demonstrate that simple and low-cost solutions exist for that purpose. Particularly a methodology has been developed, based on an optimization of the speed layout over an itinerary in order to improve the eco-driving potential of a given road infrastructure. The key point of this work is that inconsistency often exists between vehicle dynamics, road longitudinal profile and changes in regulation speeds. These changes in speed are defining the speed-sectioning of a route, and an optimization of this speed-sectioning can be easily carried out while displacing or modifying speed signs. The objective of this study is to build an optimized speed sectioning which minimizes the fuel consumption for realistic traffic and various driver behaviours, while maintaining the required safety levels. A progressive optimization loop has been worked out with a Python script including an embedded microscopic road traffic simulator. As a result an optimized speed-sectioning is leading to a gain of 227 ml for 60 minutes of simulated flow of 100 veh/h/lane, for a modification of a single speed changing point. The overall benefits are reduced energy consumption, air pollution and noise which otherwise would have been produced by braking. This work brings an effective optimization tool for road managers and its practical application is passive and inexpensive. This methodology is suitable for rural and urbanized territories and easily adaptable to any type of traffic in various countries. In perspectives, the optimization process could be extended to a full road route and to a wide range of different speed-sectioning layouts.

  • [hal-03262747] Simulation of road speed-sectioning by assessing the impact of traffic and road infrastructure

    In a context of climate change, lowering road vehicles consumption is a key point to meet CO2 reduction requirements. In addition to car technological advances, eco-driving is part of the solution but the road infrastructure should ensure its development. In a previous study, a gain of 5% in the spent energy was estimated on specific route by slightly moving some speed signs, but under the assumptions that drivers practice eco-driving and the traffic is free-flow. This paper deepens and widens these first results. The base of this research is to provide a simulation model to study the impact of traffic and speed-sectioning on the environment. Inside this model, the impact of different approach speeds to a speed-sectioning is assessed. The simulation is conducted within the Trafficware Synchro environment where parameters according to road infrastructure, vehicle and driver are based on real traffic data. Moving a speed limitation sign can contribute to a reduction of fuel consumption up to 8% depending on driver structure. This new methodology improves the accuracy of our first results and detects adverse effects as the possible emergence of congestion due to the modification of speed sectioning. In perspective this methodology represents a significant argument in road managers strategy. In addition it also represents an orienting point to investigate different action scenarios and a first step to a global optimization policy in managing road infrastructure.

  • [hal-02303574] Management of road speed sectioning to lower vehicle energy consumption

    Efforts to limit climate change should concern the transportation sector which is responsible for roughly a quarter of greenhouse gas emissions. Aside from vehicle's technical progress and driver eco-driving awareness, road infrastructure has a role to play in this environmental aim. At the project stage, the design of roads can avoid energy losses linked to marked ramps, but afterwards, during the use phase, road management can be a lever too. In this use phase framework, our paper is focused on energy saving that can be achieved by managing speed sectioning. The key point is to ensure consistency between vehicle dynamics, road longitudinal profile and speed policy. Indeed, eco-driving could be impeded if a limiting speed sign is encountered on a steep slope or in a sharp turn. In such a situation the speed sign will be qualified as misplaced. Mechanical braking has then to be used instead of simple natural deceleration. In 2018 the French government lowered authorized speed on secondary roads, from 90 to 80 km/h, with road safety as the primary motivation. In order to assess energy impact of speed-sectioning for these two speed limits, experiments have been carried out in four experimental sites. Furthermore criterion and dissipated energy computation have been developed. The developed energy computation yields to determine the expected fuel economy for the entire traffic over a day on a selected route or network. As a result, over consumption for a misplaced speed sign can reach up to 40 liters of fuel per day with an approaching speed of 80 km/h and 50 liters of fuel per day with an approaching speed of 90 km/h according to traffic data. Significant energy savings could therefore be achieved by sign placement optimization.

  • [hal-03196270] Generating a two-layered synthetic population for French municipalities: Results and evaluation of four synthetic reconstruction methods

    This article describes the generation of a detailed two-layered synthetic population of households and individuals for French municipalities. Using French census data, four synthetic reconstruction methods associated with two probabilistic integerization methods are applied. The paper offers an in-depth description of each method through a common framework. A comparison of these methods is then carried out on the basis of various criteria. Results show that the tested algorithms produce realistic synthetic populations with the most efficient synthetic reconstruction methods assessed being the Hierarchical Iterative Proportional Fitting and the relative entropy minimization algorithms. Combined with the Truncation Replication Sampling allocation method for performing integerization, these algorithms generate household-level and individual-level data whose values lie closest to those of the actual population.

  • [hal-02005356] Longitudinal profile optimization for roads within an eco-design framework

    This paper proposes a methodology to optimize the longitudinal profile of roads according to either an energy consumption or Global Warming Potential (GWP) criterion calculated for both construction and operation phases. For the construction phase assessment, this methodology is based on a earthworks model that computes the geometric differences between the natural terrain and the longitudinal road profile and moreover uses environmental data validated with real experiments. The operation phase is assessed by simulating traffic over a ten-years period. Traffic simulations are based on vehicle dynamic models, also validated with real experiments. The optimization problem is set up in a finite dimensional optimization. A case study illustrates this methodology. By taking into account actual traffic measurements, the optimized profile decreases by 6% the total primary energy consumption and by 8% the GWP.

  • [hal-03081480] Comparing Methods for Generating a Two-Layered Synthetic Population

    Synthetic population is used in many transport models ranging from trip-based, hybrid trip, tour-based, and activity-based models. As mobility decisions depend on both individuals' characteristics and family situation, generating a two-layered population that takes into account not only the individual level but also household level is essential. In the literature, three main categories of methods for two-layered population generation have been proposed. These categories are synthetic reconstruction (SR), combinatorial optimization (CO), and statistical learning (SL). SR and CO methods produce synthetic populations by means of replicating individuals, whereas SL methods generate a population following a joint probability estimation. However, selecting a generation process is not straightforward as it depends on input data and synthetic population characteristics. To the best of our knowledge, no clear methodology for selecting between these methods exists. The main objectives of this paper are to provide (1) a detailed description of the available methods, (2) a comparison between these methods, and (3) a decision-making procedure for selecting between these methods. The description and comparison of the methods relies on different criteria: marginals availability, sample size, number of potential attributes that can be handled, population size to generate, possibility of zero-cell problem, and so forth. The advantages and shortcomings of each method are illustrated, and method performance is assessed. The decision-making procedure is carried out through the proposal of a decision tree. Researchers and practitioners have now access to a comprehensive and unified framework to select the appropriate method depending on available data and features of their modeling purposes.

  • [hal-03027667] Initiative ciblée VibraSimu - Rapport final

    Le projet VibraSimu, financé par la direction scientifique de l'IFSTTAR, a été conduit de 2017 à 2019 par trois laboratoires de l'établissement : le Lepsis, Ease et le LPC. Le projet vise à mesurer les vibrations d'un vélo, à les modéliser et les reproduire sur simulateur immersif et enfin, à en évaluer l'impact sur le ressenti des participants. Le projet offre ainsi une meilleure connaissance des vibrations transmises au vélo et au cycliste lors de la circulation sur différents revêtements et améliore le simulateur vélo de l'institut en produisant les vibrations liées aux irrégularités de la chaussée. Il montre également la limite des dispositifs grand public (smartphones) pour mesurer ces vibrations.

  • [hal-02987426] Overview of strategies for reducing co2 emissions during the use phase of passenger cars

    [...]

  • [hal-02868022] Vehicle energy savings by optimizing road speed-sectioning

    In a context of decreasing resources and of climate change, lowering road vehicles consumption is a key point to meet CO2 reduction requirements. In addition to car technological advances, eco-driving is part of the solution but the road infrastructure should ensure its development. This work aims to demonstrate that road energy demand and associated pollutant emissions can be reduced by working out minor optimization of road infrastructure itself. For this to happen, a simple eco-driving potential criterion is built upon infrastructure parameters such as slopes and sight distances. This criterion aims to detect Misplaced Speed-sectioning Positions (MSP) with regard to the Starting Point of Deceleration (SPD); with speed-sectioning being the succession of speed changes along a given route. An enhanced energy waste formulation is then developed to quantify the vehicles energy waste due to misplaced road-signs. Thirdly, a traffic simulation constitutes a framework for energy evaluation; considering a full flow of vehicles, based on real traffic data, and by modeling several driver behaviors. Simulation results show that a significant fuel reduction of up to 5.5% can be achieved locally, simply by moving a road sign, for rural areas and without degrading road safety.

  • [hal-02482046] Analyse de trajectoires fluviales à partir de données SIA pour la conception d’une passerelle

    La Métropole Rouen Normandie souhaitait concevoir une nouvelle passerelle nécessitant des appuis provisoires en Seine. Aussi a-t-elle sollicité l’Ifsttar pour conduire une étude statistique des données de trajectoires, afin de définir les fuseaux de mobilité des navires en fonction notamment de leur vitesse et de leur gabarit, deux facteurs susceptibles d’avoir un impact sur la manoeuvrabilité des navires. Le traitement des données au format SIA a nécessité de recourir à des outils dédiés aux gros fichiers de données. Puis un modèle de régression linéaire a été retenu pour l’analyse des trajectoires rectilignes hors manoeuvres d’accostage. La détermination d’intervalles de prédiction a permis de délimiter les zones de navigation, et donc de mettre en évidence les surfaces du fleuve aptes à accueillir les appuis provisoires.

  • [hal-00782079] Utilisation de polynômes de Tchebychev pour l'identification de modèles à temps continu de robots

    Dans cet article, une présentation des propriétés des polynômes de Tchebychev et une formulation dérivée utilisant ces polynômes sont effectuées. La méthode d'identification présentée consiste à appliquer une transformation linéaire sur le système d'équations qui régit le processus. Pour cela, l'opérateur mathématique utilisé s'appuie sur une décomposition du signal dans une base formée de polynômes orthogonaux. Nous montrons que cette projection se comporte comme un filtre passe-bande, de telle sorte qu'une seule opération est nécessaire pour le pré-traitement des données avant le processus d'identification, à savoir choisir la dimension de la base des polynômes Tchebychev. Une identification expérimentale en boucle fermée d'un robot à 2 axes avec cette méthode est effectuée dans une dernière partie. Les résultats obtenus sont comparés et analysés avec d'autres techniques utilisées en robotique.

  • [hal-02081082] Ecodriving potential of roads according to their speed sectioning : Bosnia and France cases

    Eco-driving is an efficient way to preserve energy resources and limit environment impacts. It is first of all a question of driver behaviour and motivation, vehicle characteristics, but infrastructure parameters could favour - or impede- ecodriving. This study aims to qualify this infrastructure influence, for the speed sectioning parameter of roads. A research evaluating the adequacy between speed changes along a route, vehicle dynamics and the road gradient constitute the frame of this work. Indeed this adequacy has been proven to be descriptive of the ecodriving potentiality of a route, as detailed in a previous experimental evaluation in France (Coiret et al [8]). It is reinforced here with the help of experimental evaluation in Bosnia, with a metro-logical reinforcement : differential gps, temporal tagging system at points of interest, roof anemometer for the influence of wind, is now used to have more accurate data. In particular the better altitude measurements increase results quality, with achievable reductions of 5 % of energy consumptions for given route sections with sectioning optimisation (ie : simple speed limit panels repositioning) We have also researched crucial points on how to compare different countries and their legislation, geography, and traffic conditions. Bosnia and Herzegovina and France are in the context, to indicate that an assessment of quality level in eco-driving of the two countries is taken in consideration. Perspectives are given in terms of traffic software generalization of the experimental results and in terms of speed sectioning revisions in order to reduce linked energy losses and CO2 emissions. A route model could then be evaluated, for which speed-sectioning and positioning of amenities (speed bumper, traffic lights) could be optimized in energy use of infrastructure, with a concern not to alter the security features.

  • [hal-02012129] Model of High-Speed train energy consumption

    The current transport system is not sustainable because of its high consumption of finite resources (mainly oil) and its impact on the environment (air quality, global warming, etc.). In this context, rail has several advantages: lower consumption and emissions than road and air modes, larger passenger flow, etc. That is why, many rail infrastructures are planned in the world. Today, the impact of energy is not taken into account during the project design. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-01467446] A revised Durbin-Wu-Hausman test for industrial robot identification

    This paper addresses the topic of robot identification. The usual identification method makes use of the inverse dynamic model (IDM) and the least squares (LS) technique while robot is tracking exciting tra- jectories. Assuming an appropriate bandpass filtering, good results can be obtained. However, the users are in doubt whether the columns of the observation matrix (the regressors) are uncorrelated (exo- genous) or correlated (endogenous) with the error terms. The exogeneity condition is rarely verified in a formal way whereas it is a fundamental condition to obtain unbiased LS estimates. In Econometrics, the Durbin-Wu-Hausman test (DWH-test) is a formal statistic for investigating whether the regressors are exogenous or endogenous. However, the DWH-test cannot be straightforwardly used for robot identifi- cation because it is assumed that the set of instruments is valid. In this paper, a Revised DWH-test suitable for robot identification is proposed. The revised DWH-test validates/invalidates the instruments chosen by the user and validates the exogeneity assumption through the calculation of the QR factor- ization of the augmented observation matrix combined with a F-test if required. The experimental results obtained with a 6 degrees-of-freedom (DOF) industrial robot validate the proposed statistic.

  • [hal-01835743] Eco-design model of a railway: A method for comparing the energy consumption of two project variants

    In accordance with the environmental concerns that national policies still address throughout the world, railways have been extensively studied to provide quantified indicators for assessing construction/operations practices. It is essential to take energy consumption, into account since energy can be measured worldwide, in addition to constituting a global environmental load that is time-limited as regards resource availability and known as a discriminating criterion in comparing transport infrastructure. This article introduces an innovative, generic and systemic method dedicated to determining the energy consumption of a railway line during the pre-project phase by taking into account the complete life cycle of the rail infrastructure, including construction, maintenance and operations. The method developed (called PEAM ) focuses on assessing project variants during the design stage and therefore integrates both the geometric longitudinal constraints of the line and the thicknesses/volumes over the entire itinerary as design parameters for input into the various construction scenarios. PEAM combines methodologies stemming from life cycle assessment with a consumption model derived from physical modeling. The models associated with this method are then applied to study the energy consumption of a new high-speed line located in France that also has major implications for the European connections currently under investigation as well. Two project variants are compared in terms of total energy for a 50-year service life and a given characteristic rail traffic, including passenger and freight flows. Results obtained reveal a 30% difference between the two variants, which prior to applying PEAM were considered to be relatively similar.

  • [hal-01741653] Model of high-Speed Train Energy Consumption

    The current transport system is not sustainable because of its high consumption of finite resources (mainly oil) and its impact on the environment (air quality, global warming, etc.). In this context, rail has several advantages: lower consumption and emissions than road and air modes, larger passenger flow, etc. That is why, many rail infrastructures are planned in the world. Today, the impact of energy is not taken into account during the project design. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-01670595] Évaluation de l’adhérence de pneumatiques sur pistes comme un paramètre de la sécurité des métros automatiques

    Les métros automatiques, sans conducteurs, sont en déploiement important depuis des décennies et offrent de hauts niveaux de service et de sécurité. S’affranchir du facteur humain peut en effet augmenter ces niveaux en exploitation courante mais des protocoles robustes de commande sont alors requis pour pallier l’absence des qualités humaines d’anticipation et d’adaptation en situations exceptionnelles. De tels protocoles, dits d’anti‐collision, sont généralement basés sur une performance minimale de freinage garantie associée à un découpage de l’infrastructure en cantons, fixes ou mobiles, assurant qu’il ne puisse y avoir simultanément plus d’un véhicule sur le même canton. En particulier, un système de métro automatique sur pneu est présenté dans cet article. Des résultats d’essais de freinage de rames montrent l’efficacité de traitements visant à améliorer l’adhérence pneumatique/piste de roulement. L’entretien des pistes pour maintenir un bon niveau de freinage est discuté pour les techniques courantes de striage et de grenaillage des pistes. Enfin, une méthodologie pour permettre le suivi des pistes en temps et en espace est proposée. Elle inclut la sélection et l’emploi de matériels d’évaluation de l’adhérence issus du domaine routier.

  • [hal-01631564] Étude de trajectoires fluviales pour la métropole Rouen Normandie

    Rouen métropole a sollicité les capacités de l'Ifsttar dans le domaine du traitement du signal appliqué à l'usage des infrastructures à travers un courriel envoyé le 1er mars 2017 par M Toynan, responsable du service Ouvrage d'art de la métropole de Rouen, à MM Coiret et Vandanjon, chercheurs à l'Ifsttar. Cette sollicitation concerne un ouvrage en projet pour le franchissement de la Seine. L'ouvrage sera de type léger, sous la forme d'une passerelle dédiée aux modes doux (cycles, piétons). Il complètera l'offre de franchissement existante et reliera efficacement des pôles générateurs de déplacements dans l'agglomération, et notamment l'Ecoquartier Luciline en cours de réalisation en rive droite et l'Ecoquartier Flaubert en projet en rive gauche dans le cadre du projet global Seine Cité. L'ouvrage est donc envisagé dans le secteur Ouest de l'agglomération rouennaise, entre les ponts Guillaume Le Conquérant et Gustave Flaubert, soit en traverse de la partie de Seine accueillant régulièrement la grande Armada. Les appuis principaux de la structure seraient situés dans l'alignement des hangars existants. La structure provisoire dite > sera déconstruite préalablement aux travaux de passerelle. A ce jour, il n'est pas envisagé d'implanter d'appui définitif en Seine. Néanmoins, le recours à des appuis intermédiaires en phase réalisation semble incontournable. De même, la définition d'un gabarit de passe navigable influe sur la définition de la limite basse d'intrados d'ouvrage et donc sur la définition des accès. Seule une connaissance plus précise des trajectoires fluviales entre le Pont Guillaume le Conquérant en amont et le Pont Flaubert en aval permettra donc de gagner en précision sur la définition des implantations possibles d'appuis provisoires puis sur la définition du gabarit fluvial définitif. À cet effet, l'Ifsttar a été sollicité pour une étude statistique de trajectoire de navires, selon un cahier des charges qui est donné en annexe au présent document. L'Ifsttar a répondu à ce cahier des charges en rédigeant une proposition technique, également en annexe à ce document, dont le produit est un rapport d'étude sur les trajectoires fluviales sur la section considérée. Une réunion de lancement a eu lieu le 11 mai 2017 dans les locaux de Rouen métropole. Ce document est la troisième version de ce rapport d'étude. Une première version a été envoyée le 17 juin afin d'échanger avec la Métropole Rouen Normandie. Ce document a été le support d'une réunion téléphonique avec la métropole de Rouen le 27 juin afin, notamment, de préparer une réunion entre la métropole et le grand port maritime de Rouen. Nous avons abouti à une deuxième version envoyée le 3 juillet 2017 afin de fournir des données opérationnelles pour la métropole. Suite à des relectures internes, nous avons modifié cette deuxième version en améliorant sa forme afin d'aboutir à cette version qui est remise lors de la réunion de présentation des résultats du 11 juillet 2017. Ce rapport est découpé en 10 chapitres. Tout d'abord, la structure des données, que nous avons obtenues par le port maritime, est expliquée. Les grandes étapes du traitement de ces données sont présentées dans le chapitre suivant. Puis, les résultats de ce traitement sont affichées sous forme de graphiques pour chaque trimestre de l'année 2016 dans les chapitres 4 à 8. Enfin, les deux dernier chapitres discutent les résultats et conclut le rapport.

  • [hal-01578913] Towards eco-aware timetabling: evolutionary approach and cascading initialisation strategy for the bi-objective optimisation of train running times

    In railway planning, the timetabling step needs, as input, the train running times, which are calculated from a train dynamic model. Usually, this model determines the most energy-efficient train trajectory for a predefined time. However, this time may not correspond to the timetable-makers' needs. They should have the choice among a set of solutions, more or less energy-consuming. This study proposes a method capable of producing a set of alternative running times with the associated mechanical energy required. To this end, the authors' contribution is to set up an efficient evolutionary multi-objective algorithm builds a set of well-spread and diversified solutions which approximate a Pareto front. The solutions are all compromises between running time and energy-consumption, the two minimisation objectives concurrently optimised. Given that an evolutionary algorithm is strongly dependent on the initialisation phase, the efficiency of the algorithm is improved through a specific and original mechanism connecting multiple initialisations in cascade in order to accelerate the convergence towards the best solutions. A set of results obtained on randomly-generated instances is analysed and discussed.

  • [tel-01518299] Quelques applications des techniques robotiques d'identification à des problèmes du Génie Civil

    Le fil conducteur de ma recherche est l'application des techniques robotiques en identification des modèles inverses aux systèmes de transport routier et ferroviaire. Mes compétences scientifiques sont dans le domaine des mathématiques appliquées : statistiques, analyse numérique matricielle, théorie de la viabilité. Travaillant dans un organisme de recherches finalisées, ces compétences ont été mises en oeuvre pour résoudre des questions pratiques - souleÎes par les chantiers du génie civil : estimation du torseur des efforts de contact lors du compactage des enrobés, évaluation de différents systèmes de malaxage des bétons [10] ; - provenant de la sécurité routière : mesures de la courbe reliant le taux de glissement au frottement pneumatique/chaussée d'un Îhicule routier en freinage [1], évaluation de l'état d'un Îhicule en conduite apaisée[9], - en écoconception : évaluation de la consommation des trains circulant sur une ligne à grande vitesse [2], établissement des fiches horaires pour les conducteurs (article accepté). Ces problèmes pratiques - ont nécessité des expérimentations de grandes ampleurs : 50 % de mes publications sont liés à des expérimentations que j'ai souvent organisées ; - ont dépassé mon champ disciplinaire : tous mes travaux sont effectués en collaboration avec d'autres laboratoires et avec des industriels. D'un point de vue théorique, j'ai contribué à l'établissement des méthodes d'identifications : IDIM-LS, IDIM-IV, DIDIM. ([3, 5, 6, 7, 4, 8]). Une contribution théorique complètement différente et fortuite est l'introduction des concepts issus de la théorie de la viabilité en sécurité routière [9]. Mon activité de recherche en terme d'encadrement et de publications. Publications : 10 revues, 1 brevet (français et mondial), 29 congrès internationaux sur article dont 22 Ifac-Ieee, 11 congrès internationaux sur résumé, 5 revues techniques francophones, 7 congrès francophones. Encadrement de thèses et de post-doctorant : 1,88 sur 4 thèses (3 Bourses Cifre, 1/2 Bourse Région, 1/2 Bourse Ifsttar), 1 post-doctorant (financé sur projet Européen).

  • [hal-01502084] ACV des projets d'infrastructures route/rail à l'échelle d'un réseau avec prise en compte des paramètres d'éco-conception

    Le point de départ de notre recherche était la comparaison environnementale de différentes techniques de construction d'infrastructure de transport. Ce travail est matérialisé par le logiciel Ecorce. Il s'agissait de sélectionner et d'améliorer les techniques de construction pour réduire les impacts environnementaux. Cependant, les impacts environnementaux d'une infrastructure de transport sont, pour des critères comme les GES ou l'énergie, imputables pour une grande partie à la phase d'usage. L'idée initiale de notre recherche fut donc d'évaluer et de proposer des solutions afin de limiter les impacts de la phase d'usage dès la conception du projet par l'optimisation des matériaux ou des tracés. Aborder la phase d'usage étend considérablement les domaines à étudier. Pour arriver à des résultats concrets, nous avons restreint notre champ d'investigation à deux critères : les GES et l'énergie. Par ailleurs, nous avons travaillé en collaboration : avec la SNCF réseau sur la partie ferroviaire, avec le Laboratoire Transport et Environnement sur la partie routière. Ainsi, dans le domaine ferroviaire, nous avons proposé une méthodologie d'évaluation appelée PEAM (Project Energy Assessment Method) que nous avons appliquée pour évaluer et comparer deux tracés sur le projet de ligne à grande vitesse Montpellier-Perpignan. Dans le domaine ferroviaire, nous sommes allés au bout des objectifs initiaux du livrable, car nous avons aussi considéré la ligne classique existante, nous nous sommes donc situés au niveau d'un réseau. Dans le domaine routier, nous avons proposé une méthodologie appelée Sloop (Slope optimisation) afin d'optimiser le profil longitudinal d'un tracé routier pour limiter l'énergie ou les émission de GES pendant les phases de construction, de maintenance et d'usage. Nous l'avons appliqué sur un projet récent de modification du tracé de la RN7 afin d'évaluer son potentiel. Ainsi, sur ce cas, nous avons montré que nous pouvions baisser de 10% les émissions de GES en phase d'usage en proposant un profil longitudinal optimisé et réaliste au regard des critères de conception routière. Nous avons également contribué à démontrer l'influence de la texture sur la consommation de carburant en étudiant l'impact de la résistance au roulement du reÐtement de chaussée. Ceci ouvre des perspectives importantes concernant la gestion des réseaux d'infrastructure. En effet, certaines techniques bas coût comme les enduits ont des macrotextures importantes qui pourraient être à l'origine de surconsommation. Alors que le domaine routier était notre domaine de prédilection, nous sommes allés moins loin que dans le domaine ferroviaire en n'atteignant pas l'échelle du réseau comme le titre initial du livrable le présuppose. Cela tient à la différence de culture entre les deux domaines. Le propriétaire de lgv tient compte explicitement de l'énergie qu'il va facturer à l'entreprise ferroviaire. Le propriétaire d'un réseau routier n'est pas dans cette situation. Il a, donc, été, pour nous, plus facile de susciter des collaborations avec des entreprises du domaine ferroviaire que dans le domaine routier. Cependant, nos résultats récents nous rendent optimistes pour nouer de nouvelles collaborations dans ce secteur. Nous avons proposé une suite à ce travail pour le contrat d'objectif et de performance 2017-2021. Cette proposition a été validée par l'Ifsttar et ses tutelles. Nous utiliserons nos acquis concernant l'évaluation de la phase d'usage pour orienter nos travaux vers l'écoexploitation des infrastructures de transport. Il s'agira de proposer un outil d'évaluation des impacts environnementaux qui prendra en compte la phase d'usage ce qui permettra de synthétiser nos résultats et de les proposer via un logiciel adapté à la profession. Nous travaillerons également sur la potentialité d'éco-conduite des infrastructures routières selon l'adéquation entre tracé et vitesse d'usage à travers une thèse qui a commencé fin 2016 en cotutelle avec l'université de Sarajevo. Nous continuerons à travailler sur la résistance au roulement et sur l'influence des paramètres géométrique des tracés sur la consommation au sein du projet Danois Rose. Nous avons prévu une ouverture au mode doux en étudiant l'usage des pistes cyclables en développant un appareil permettant de mesurer la « cyclabilité » des itinéraires à Îlo, la « cyclabilité » étant la mesure de l'énergie d'usage. Lors de la prise en compte de la phase d'usage, nous avons concentré nos travaux sur deux critères : les GES et l'énergie. Sans se disperser, nous nous intéresserons progressivement à d'autres indicateurs comme les émissions de particules fines.Enfin, nous sommes, actuellement, limités dans nos évaluations par nos hypothèses simplistes sur le trafic. Nous devrons monter des collaborations afin de construire différents scénarios d'évolution permettant de fournir des évaluations plus riches tenant compte, notamment, de l'arriÎe du Îhicule autonome.

  • [hal-01470518] Pistes cyclables et innovation dans les marchés publics

    Nova'TP, commission TP de NOVABUILD, a initié un groupe de travail visant à favoriser l'innovation dans les marchés publics de travaux, grâce à l'élaboration de cahier des charges décrivant les performances attendues plutôt que les moyens de les atteindre. Cette démarche s'est appuyée sur l'exemple concret du choix des matériaux des pistes cyclables, qui sont intégrées à la plupart des aménagements réalisés sur l'espace public. La première étape du projet a consisté à définir les critères objectifs de performance de ces matériaux, afin de répondre aux enjeux de confort, de développement durable, de coût... exprimés par les maitres d'ouvrage. Sur certains critères, comme le confort, l'absence de référentiel existant pour les infrastructures cyclables, nous a conduit à développer une démarche innovante, en adaptant l'usage du Vel'Audit (Îlo instrumenté, prévu initialement pour l'inspection à haut rendement d'aménagements cyclables). Les matériaux déjà couramment utilisés pour ce type d'infrastructure ont été caractérisés selon ces critères. Ces données ont ensuite été regroupées dans une application, développée pour faciliter l'analyse et la comparaison des offres par les maîtres d'ouvrage. Cette application permet de comparer des matériaux conventionnels entre eux ou avec des matériaux innovants sous un aspect performentiel. Ce logiciel d'aide à la décision a été testé par Nantes Métropole sur plusieurs opérations d'aménagement, pour Îrifier sa pertinence et proposer certaines évolutions.

  • [hal-01470514] Transposability of road management devices to the evaluation of comfort and safety of cycling lanes

    Les collectivités françaises développent de plus en plus d'aménagement cyclables, et il apparaît donc plus d'attentes concernant la sécurité de ces aménagements, leur confort, leur durabilité, leur gestion et entretien... Si pour le réseau routier général, les maîtres d'ouvrages disposent d'outils d'aide à la décision, basés sur des critères tels que la sécurité, la mobilité, l'environnement et le coût, les voies cyclables ne sont que partiellement concernées par ces outils. Ce travail vise à répondre aux attentes des gestionnaires de réseaux cyclables et a été réalisé dans le cadre du groupe de travail « Nova-TP » sur l'innovation dans les transports. En première partie de ce travail, L'outil Vel'audit est présenté. DériÎ des outils routiers, Vel'Audit est un Îlo instrumenté qui permet de réaliser des releÎs d'images ensuite exploitables à l'aide du logiciel IREVE. Ce diagnostic permet à la fois de caractériser l'infrastructure et d'identifier des défauts de cyclabilité. Vél'audit dispose aussi d'une centrale inertielle mesurant les vibrations subies par le Îlo et conduisant au calcul d'un indicateur confort indexé à la vitesse d'avancement. Pour l'aspect sécurité, le SRT (Skid Resistance Tester) est ensuite présenté, comme un des moyens de mesure de l'adhérence exploité pour les routes et pouvant être directement transposé aux pistes cyclables. Des essais de validité sur piste cyclable sont ensuite discutés et, en perspectives, le développement d'un matériel utilisable continûment sur itinéraire, inspiré du Grip-Tester, est envisagé en prolongement des mesures ponctuelles du SRT. Ainsi différentes techniques d'auscultations routières éprouÎes peuvent répondre aux besoins émergents des gestionnaires d'infrastructures cyclables, tout en s'adaptant aux caractéristiques de ces déplacements cyclables. Ces transpositions sont encore peu investie alors même que les besoins existent et qu'en finalité cela pourrait aboutir à la construction d'un indice de qualité cyclable (IQCy) à l'image de l'IQRN routier.

  • [hal-01326825] Ecodriving potentiality assessment of road infrastructures according to the adequacy between infrastructure slopes and speeds limits

    The energy associated with the use of road infrastructure exceeds in few years the energy needed for its construction. The link between infrastructure and use energy has not been, however, studied in depth, particularly as the legitimate transport societal expectations are related to efficiency and safety. However, we can consider reducing the energy use by working out minor optimizations of the road infrastructure itself, which is a major challenge in a context of overall decrease of resources and increasing pressures on the environment. Experimental work is carried out here to develop one of these optimizations by improving the eco-driving potential of roads. It is based on the adequacy between vehicles dynamics, the road longitudinal profile and the speed sectioning of the infrastructure. This sectioning corresponds to the succession of speed limitations (road signs, roundabouts, intersections ...). It may allow drivers to eco-drive or not, depending on dynamics, slopes, and secondary parameters as driver reaction time or distance of visibility. Optimal speed sectioning aims to limit the mechanical braking needed by potential energy reduction, due to slopes, which can be encountered simultaneously with the needed kinetic energy reduction. Evaluation has been made on actual road sections, while recording both vehicle dynamics, driver commands, road signs positions and road longitudinal profile. Results show that energy consumption of vehicles approaching a speed reduction sign can be reduced by moving backward this sign of about 700 meters, without penalizing the primary safety function. The associated gain, for this optimization, has been evaluated to 14 liters of fuel per day for one of the experimental sites, considering traffic data. Application of this method on a network could then lead to considerable energy saving by allowing eco-driving.

  • [hal-01308894] Physical parameter identification of a one-degree-of-freedom electromechanical system operating in closed loop

    This paper deals with the identification of physical parameters of a one-degree-of-freedom electromechanical system that operates in closed loop. Two models are considered: the inverse dynamic model which is linear in relation to the physical parameters to be identified and the direct dynamic model which is linear in relation to a nonlinear combination of the physical parameters. Three methods are considered and compared: the traditional method which makes use of the inverse dynamic model, tailormade data prefiltering and the least-squares method, an instrumental variable approach which makes use of the direct and inverse dynamic models and another instrumental variable approach which makes use of the direct dynamic model only. The experimental results show that the instrumental variable method based on the use of the inverse and direct dynamic models seems to be more appropriate than the two others because it is robust against noise and the physical parameters are directly identified.

  • [hal-00973430] Experimental Joint Stiffness Identification Depending on Measurements Availability

    This paper addresses the important topic of joint flexibility identification. Three dynamic models depending on measurements availability are compared. The parameters are estimated by using the ordinary least squares of an over linear system obtained from the sampling of the dynamic model along a closed loop tracking trajectory. An experimental setup exhibits the experimental identification results.

  • [hal-00960384] Practical guidelines for Life Cycle Assessment applied to railways project

    Current transport systems are not likely to be sustainable, since energy resources may be less accessible, facing a rapidly growing demand and because of environmental constrains. In this context a great interest arose for sharing environmental assessment practices between infrastructures owners and researchers. For this present work a partnership between RFF and Ifsttar was decided to study environmental effects and energy consumption for railways life cycle. It paves the way to a full life cycle analysis (LCA) for environmental burdens of railway infrastructures and aims at identifying the best design practices at the project level related to environmental criteria. This LCA takes into account earthwork, railway structure and the operation phase, i.e., the analysis performed is based on the estimation of energy consumptions due to construction, maintenance and on the traffic. Results of this work could enhance practices for environment preservation for the plan of building 4000 kilometres of new high-speed railways, decided in the French National Transport infrastructure scheme. Applying LCA to the project phase is a rather new approach. It requires defining a global functional unit as a basic hypothesis of any study, different from the previous studies. Then, the lifecycle subsystems are successively investigated (construction, maintenance and use) to determine the best way for project Functional Unit definition and further assessment method application.

  • [hal-00960333] Application of viability theory for road vehicle active safety during cornering manoeuvres

    Viability theory proposes geometric metaphors in addition to classical ordinary differential equation analysis. In this paper, advantages of applying viability theory to road safety domain are presented. The exact issue is to determine if, from an initial state of a vehicle/road/driver system, a soft controls strategy is compatible with a safe driving sequence. The case of a car negotiating a curve is considered. The application of the viability theory to this issue offers the advantage to avoid classical full computing of the system. Instead of that, it consists on verifying that the states and the controls belong to a subset called the viability kernel. The construction and the use of the viability kernel for a vehicle system dynamic is proposed by using support vector machines algorithm. Then, the applicability of this theory is demonstrated through experimental tests. This innovative application of the viability theory to vehicle dynamics with road safety concerns could benefit to robust embedded warning systems.

  • [hal-00954732] An instrumental variable approach for rigid industrial robots identification

    This paper deals with the important topic of rigid industrial robots identification. The usual identification method is based on the use of the inverse dynamic model and the least-squares technique. In order to obtain good results, a well-tuned derivative bandpass filtering of joint positions is needed to calculate the joint velocities and accelerations. However, we can doubt whether the bandpass filter is well-tuned or not. Another approach is the instrumental variable (IV) method which is robust to data filtering and which is statistically optimal. In this paper, an IV approach relevant for identification of rigid industrial robots is introduced. The set of instruments is the inverse dynamic model built from simulated data which are calculated from the simulation of the direct dynamic model. The simulation assumes the same reference trajectories and the same control structure for both the actual and the simulated robot and is based on the previous IV estimates. Furthermore, to obtain a rapid convergence, the gains of the simulated controller are updated according to IV estimates. Thus, the proposed approach validates the inverse and direct dynamic models simultaneously and is not sensitive to initial conditions. The experimental results obtained with a 2 degrees of freedom (DOF) planar prototype and with a 6 DOF industrial robot show the effectiveness of our approach: it is possible to identify 60 parameters in 3 iterations and in 11 s.

  • [hal-00941612] Generic instrumental variable approach for industrial robot identification

    This paper deals with the important topic of industrial robot identification. The usual identification method is based on the inverse dynamic identification model and the least squares technique. This method has been successfully applied on several industrial robots. Good results can be obtained, provided a well tuned derivative band-pass filtering of joint positions is used to calculate the joint velocities and accelerations. However, one cannot be sure whether or not the band-pass filtering is well tuned. An alternative is the instrumental variable (IV) method, which is robust to data filtering and is statistically optimal. In this paper, a generic IV approach suitable for robot identification is proposed. The instrument set is the inverse dynamic model built from simulated data calculated from simulation of the direct dynamic model. The simulation is based on previous estimates and assumes the same reference trajectories and the same control structure for both actual and simulated robots. Finally, gains of the simulated controller are updated according to IV estimates to obtain a valid instrument set at each step of the algorithm. The proposed approach validates the inverse and direct dynamic models simultaneously, is not sensitive to initial conditions, and converges rapidly. Experimental results obtained on a six-degrees-of-freedom industrial robot show the effectiveness of this approach: 60 dynamic parameters are identified in three itérations.

  • [hal-00914588] Model of high-speed train energy consumption

    In the hardening energy context, the transport sector which constitutes a large worldwide energy demand has to be improving for decrease energy demand and global warming impacts. In a controversial situation where subsists an increasing demand for long-distance and high-speed travels, high-speed trains offer many advantages, as consuming significantly less energy than road or air transports. At the project phase of new rail infrastructures, it is nowadays important to characterize accurately the energy that will be induced by its operation phase, in addition to other more classical criteria as construction costs and travel time. Current literature consumption models used to estimate railways operation phase are obsolete or not enough accurate for taking into account the newest train or railways technologies. In this paper, an updated model of consumption for high-speed is proposed, based on experimental data obtained from full-scale tests performed on a new high-speed line. The assessment of the model is achieved by identifying train parameters and measured power consumptions for more than one hundred train routes. Perspectives are then discussed to use this updated model for accurately assess the energy impact of future railway infrastructures.

  • [hal-00851519] A Durbin-Wu-Hausman Test for Industrial Robots Identification

    This paper deals with the topic of industrial robots identification. The usual identification method is based on the use of the inverse dynamic model (IDM) and least squares (LS) technique. Good results can be obtained provided that a well-tuned bandpass filtering is used. However, we are always in doubt if regressors are exogenous i.e. statistically uncorrelated with error terms. Surprisingly, in papers dealing with identification of real-world systems, exogeneity assumption is never verified whereas it is a fundamental condition to obtain unbiased estimates. In Econometrics, the Durbin-Wu-Hausman test (DWH-test) is a theoretical method for investigating whether regressors are exogenous or not. The DWH-test makes of the Two Stage Lesat Squares estimator (2SLS) and an augmented LS regression. However, this test cannot be used as is for robots identification: instruments set is supposed to be valid and restrictive statistical assumptions are made while they are quite implausible in practice. In this paper, we aim at bridging the gap between Econometrics and Control engineering practices by introducing a revisited version relevant for robots identification. An experimental validation performed on a 2 degrees of freedom (DOF) robot shows the effectiveness and the usefulness of this revisited DWH-test.

  • [hal-00851515] Identification of 6 DOF Rigid Industrial Robots with the Instrumental Variable Method

    This paper deals with the topic of robots dynamics identification. In this paper, we focus on the instrumental variable (IV) technique. For robots, the set of instruments is the inverse dynamic model built from simulated data which are calculated from the integration of the direct dynamic model, assuming the same reference trajectories and the same control law structure for both actual and simulated robots. The integration of the direct dynamic model is based on previous IV estimates. This defines an iterative algorithm. Furthermore, gains of the simulated controller are updated to get a fast convergence. Experimental results obtained on a six degrees of freedom robot manufactured by Stäubli show the effectiveness of our approach: 60 dynamic parameters are estimated in only two iterations.

  • [hal-00850643] A New Closed-Loop Output Error Method for Parameter Identification of Robot Dynamics

    Offline robot dynamic identification methods are mostly based on the use of the inverse dynamic model, which is linear with respect to the dynamic parameters. This model is sampled while the robot is tracking reference trajectories that excite the system dynamics. This allows using linear least-squares techniques to estimate the parameters. The efficiency of this method has been proved through the experimental identification of many prototypes and industrial robots. However, this method requires the joint force/torque and position measurements and the estimate of the joint velocity and acceleration, through the bandpass filtering of the joint position at high sampling rates. The proposed new method called DIDIM requires only the joint force/torque measurement, which avoids the calculation of the velocity and acceleration by bandpass filtering of the measured position. It is a closed-loop output error method where the usual joint position output is replaced by the joint force/torque. It is based on a closed-loop simulation of the robot using the direct dynamic model, the same structure of the control law, and the same reference trajectory for both the actual and the simulated robot. The optimal parameters minimize the 2-norm of the error between the actual force/torque and the simulated force/torque. This is a nonlinear least-squares problem which is dramatically simplified using the inverse dynamic model to obtain an analytical expression of the simulated force/torque, linear in the parameters. A validation experiment on a two degree-of-freedom direct drive rigid robot shows that the new method is efficient.

  • [hal-00776297] Viability Theory and Road safety

    Viability theory proposes geometric metaphors in addition to classical ordinary differential equation analysis. This theory is applied on a vehicle cornering. The issue is to determine if a state of the system is compatible with a soft controls strategy which leads the car to the end of the corner. The viability theory offers tools which enable to answer to this question without computing in real time these controls. The issue resumes to verify that this state belongs to a set called the viability kernel. The construction and the use of the viability kernel for a vehicle system dynamic is proposed by using Support Vector Machines algorithm. The applicability of this theory is demonstrated through experimental tests. It is the first time that the viability theory is applied to vehicle dynamics with road safety concerns.

  • [hal-00751410] New Closed-Loop Output Error Method for Robot Joint Stiffness Identification

    This paper deals with joint stiffness identification with a new Closed-Loop Output Error (CLOE) method which minimizes the quadratic error between the actual motor force/torque and the simulated one. This method is based on the DIDIM (Direct and Inverse Identification Model) procedure which has been validated on rigid robots and which is now applied to a flexible joint robot. DIDIM method requires a gain updating in the simulated robot in order to keep the bandwidth of the rigid controlled degree of freedom (dof ) and to keep the natural frequency of the flexible dof, close to the actual ones, at each step of the recursive Gauss Newton non linear programming algorithm. This gain updating requires a first step of estimating the natural frequency of the flexible dof before applying DIDIM method in a second step. An experimental setup exhibits identification results and shows the effectiveness of our approach.

  • [hal-00751406] Méthode à erreur de sortie pour l'identification en boucle fermée des paramètres dynamiques d'un robot à flexibilité localisée, sans mesure de flexibilité

    Ce papier présente une nouvelle méthode à erreur de sortie en deux étapes pour l'identification en boucle fermée des paramètres inertiels, de frottements et de raideur d'un axe de robot avec flexibilité articulaire localisée. Cette méthode utilise uniquement l'effort et la position du moteur, sans aucune mesure de flexibilité. La première étape identifie la fréquence du mode rigide asservi et la fréquence du mode flexible à entrée bloquée, en utilisant un modèle haute fréquence double intégrateur du robot. L'identification utilise une méthode à erreur de sortie sur la position du moteur. Ces deux paramètres de fréquence optimaux sont ensuite utilisés dans la deuxième étape pour l'identification des paramètres dynamiques du robot par une méthode à erreur de sortie sur l'effort moteur. Cette méthode récente (DIDIM) qui utilise les modèles d'identification directe et inverse du robot permet d'obtenir une convergence des paramètres très rapide et insensible aux conditions initiales. Une validation expérimentale sur un robot un axe montre l'efficacité de la nouvelle méthode comparée à deux méthodes à erreur de sortie classiques.

  • [hal-00656825] Experimental Joint Stiffness Identification Depending on Measurements Availability

    This paper addresses the important topic of joint flexibility identification. Three dynamic models depending on measurements availability are compared. The parameters are estimated by using the ordinary least squares of an over linear system obtained from the sampling of the dynamic model along a closed loop tracking trajectory. An experimental setup exhibits the experimental identification results.

  • [hal-00656818] Joint Stiffness Identification from only Motor Force/Torque Data

    This paper deals with joint stiffness identification with only actual motor force/torque data instead of motor and load positions. The parameters are estimated by using the DIDIM method which needs only input data. This method was previously validated on a 6 DOF rigid robot and is now extended to flexible systems. The criterion to be minimized is the quadratic error between the measured actual motor force/torque and the simulated one. The optimal parameters are calculated with the Nelder - Mead simplex algorithm. An experimental setup exhibits the experimental identification results and shows the effectiveness of our approach.


titre

Il n'y a aucune publication pour cette liste.

titre réf

Allocating imprecise safety targets in satellite-based localization systems used in railway signaling operations

SASSI, Insaf ; BEUGIN, Julie ; SALLAK, Mohamed ; AIT TMAZIRTE, Nourdine   /   (2020)

ESREL'20 - PSAM 15, 30th European Safety and Reliability Conference and the 15th Probabilistic Safety Assessment and Management Conference, ITALIE, 8p

https://www.esrel2020-psam15.org/

Plus d'infos

ref decembre

On the robust guidance of users in road traffic networks

FARHI, Nadir ; HAJ SALEM, Habib ; LEBACQUE, Jean Patrick   /   (2014)

ICNAAM - International Conference of Numerical Analysis and Applied Mathematics, GRECE, 4p

Télécharger le document

Un ajout pour mise à jour

Info pour jeudi


madis julie

Démonstration de la sécurité opérationnelle de la téléconduite des trains : contexte, méthodologie et défis

BOUSSIF, Abderraouf ; COLLART-DUTILLEUL, Simon ; BARANOWSKI, François ; BEUGIN, Julie ; SCHON, Walter   /   (2020)

Lambda Mu 22, 22e Congrès de maîtrise des risques et de sûreté de fonctionnement, Les risques au coeur des transitions (e-congrès), FRANCE, pp312-320

https://www.imdr-lm22.fr

Plus d'infos

Proposition d'une approche orientée modèles pour évaluer la sécurité des systèmes de signalisation ferroviaire utilisant les GNSS

HIMRANE, Ouail ; BEUGIN, Julie ; GHAZEL, Mohamed   /   (2020)

Lambda Mu 22, 22e Congrès de maîtrise des risques et de sûreté de fonctionnement. Les risques au coeur des transitions (e-congrès), FRANCE, 10p

https://www.imdr-lm22.fr/
https://hal.archives-ouvertes.fr/hal-03480709

Télécharger le document

Allocating imprecise safety targets in satellite-based localization systems used in railway signaling operations

SASSI, Insaf ; BEUGIN, Julie ; SALLAK, Mohamed ; AIT TMAZIRTE, Nourdine   /   (2020)

ESREL'20 - PSAM 15, 30th European Safety and Reliability Conference and the 15th Probabilistic Safety Assessment and Management Conference, ITALIE, 8p

https://www.esrel2020-psam15.org/

Plus d'infos

Towards a Model-Based Safety Assessment of Railway Operation Using GNSS Localization

HIMRANE , Ouail ; BEUGIN, Julie ; GHAZEL, Mohamed   /   (2020)

ESREL'20 - PSAM 15, 30th European Safety and Reliability Conference and the 15th Probabilistic Safety Assessment and Management Conference, ITALIE, 8p

https://www.esrel2020-psam15.org/

Plus d'infos

Toward Formal Safety and Performance Evaluation of GNSS-based Railway Localisation Function

HIMRANE, Ouail ; BEUGIN, Julie ; GHAZEL, Mohamed   /   (2021)

IFAC-PapersOnLine, 54, 2, pp159-166, doi: 10.1016/j.ifacol.2021.06.049

https://www.sciencedirect.com/science/article/pii/S2405896321004973
https://doi.org/10.1016/j.ifacol.2021.06.049

Télécharger le document

Towards a Specified Operational Design Domain for a Safe Remote Driving of Trains

TONK, Abhimanyu ; BOUSSIF, Abderraouf ; BEUGIN, Julie ; COLLART-DUTILLEUL, Simon   /   (2021)

ESREL 2021, 31st European Safety And Reliability Conference, FRANCE, 8p

https://easychair.org/smart-program/ESREL2021/

Plus d'infos

From French National Signaling Systems to ERTMS: Considering the Evolution of Track-Side Systems

DE ALMEIDA PEREIRA, Dalay Israel ; HIMRANE, Ouail ; BON, Philippe ; BEUGIN, Julie   /   (2021)

International Journal of Signal Processing Systems, 9, 2, pp11-16

http://www.ijsps.com/index.php?m=content&c=index&a=show&catid=77&id=333

Télécharger le document

Hal id

Alain L'Hostis, Ndèye Aïta Cissé, Maxime Hachette
The 15-minute city : a new avatar of proximity and a pillar of the European urban transition: An analysis of the academic knowledge produced by the ENUAC programme and collected by the ACUTE project for the present and future inspiration of urban practice.. Accessibility and Connectivity of the 15-minute-city ACUTE / UERA TWG Urban Accessibility and Connectivity, Oct 2023, Antwerp, Belgium
Alain L'Hostis, Ndèye Aïta Cissé, Maxime Hachette
Implementing the 15-minute city: An accessibility and proximity knowledge hub to bring research and practice closer together. 2023 Annual POLIS Conference, POLIS, Nov 2023, Leuven, Belgium
Johannes Moser, Fabian Wenner, Alain L’hostis
Visualising Transformations of Geographical Time–Space by Transport Systems. The Case of Germany, 1990–2020. KN - Journal of Cartography and Geographic Information, 2023
10.1007/s42489-023-00151-9
Maxime Hachette, Alain L'Hostis
La ville à 15 minutes, nouvel avatar du concept de proximité, pilier de la transition urbaine européenne : Une analyse des connaissances académiques produites par le programme ENUAC et collectées par le projet ACUTE, pour inspirer la pratique urbaine. « Journée d’études – GéoProximitéS : Villes petites et moyennes en transition : quels enjeux, pratiques et modèles de proximités ? », Sylvie Delmer; Marc Dumont, Jun 2023, Villeneuve d’Ascq, France
Dylan Moinse, Alain L'Hostis
Optimizing intermodal commuting by way of detours and breaks: Evidence of micromobility users in France. 2023
Wassim Hached, Alain L'Hostis
Mobility Hubs, from exploring the concept to implementing and assessing its impact. Forum de l'AIT, Feb 2023, Paris, France
Dylan Moinse, Alain L'Hostis
La mise en pratique de parcours commentés en micro-mobilités : Interroger les pratiques intermodales inscrites dans des quartiers de gare de la région Hauts-de-France. Interroger et représenter les territoires à partir des expériences individuelles : L’apport des méthodes sensibles, Laboratoire Ville Mobilité Transport (LVMT), Mar 2023, Paris, France
Alain L'Hostis, Maxime Hachette
Rockets shriveling the world. Journal of Transport Geography, 2022, 104, pp.103423
10.1016/j.jtrangeo.2022.103423
Dylan Moinse, Alain L'Hostis
The Combination of Collective and Individual Modes in the Hauts-de-France Region: A Quantitative Observation of On-board Small Vehicles. Union Géographique Internationale, Jul 2022, Paris, France
Wassim Hached, Alain L'Hostis
Mobility Hubs, a lever for more sustainable mobility?. [Research Report] Université gustave eiffel; LVMT. 2022, pp.75
Wassim Hached, Alain L'Hostis, Albert Gragera
Discover a clearer vision of mobility hubs: With Mobi-Mix, from literature review to implementation, and assessment. TRA - Transport Research Arena, Nov 2022, Lisbon, Portugal
Dylan Moinse, Matthieu Goudeau, Alain L'Hostis, Thomas Leysens
Intermodal use of (e-)scooters with train in the Provence-Alpes-Côte d’Azur region: towards extended train stations areas?. Environmental Economics and Policy Studies, 2022
10.1007/s10018-022-00349-7
Wassim Hached, Alain L'Hostis
Enhancing Mobility Hubs' insights with Mobi-Mix. e smartec and MOBI MIX Joint Final Conference, Nov 2022, Bruxelles, Belgium
Maxime Hachette, Alain L'Hostis
Guidance for infrastructure and investment policies. Université gustave eiffel; LVMT. 2022, pp.44
Dylan Moinse, Alain L'Hostis
La intermodalitat entre el transport públic i els modes individuals. Une observació quantitativa de vehicles petits a bord. Vermuts de la Mobilitat, Institut d'Estudis Regionals i Metropolitans de Barcelona, Oct 2022, Barcelona, Spain. pp.39
Maxime Hachette, Alain L'Hostis
Policy Roadmap and Policy Guide. Université gustave eiffel; LVMT. 2022, pp.55
Wassim Hached, Alain L'Hostis, Albert Gragera
Investigating “mobility hubs“, and assessing their impacts. TRA, Nov 2022, Lisbon, Portugal. 2022
Alain L'hostis, Farouk Abdou
What is the Shape of Geographical Time-Space? A three-dimensional Model made of Curves and Cones. ISPRS International Journal of Geo-Information, 2021, 10 (5), pp1-17
10.3390/ijgi10050340
Dylan Moinse, Matthieu Goudeau, Alain L'Hostis
An Analysis of Intermodal Use of E-scooters with train in the Provence-Alpes-Côte d’Azur Region, in France: Towards Extended Railway Station Areas?. Smart And Sustainable Cities Conference #3 - Session 5: Urban mobility, New Technologies and Urban Development, May 2021, Lille, France
Wassim Hached, Alain L'Hostis
Mobility hubs, new levers for sustainable urban mobility?. Environmental Sustainability & Smart-Cities, May 2021, Lille, France
Alain L'Hostis, Farouk Abdou
Courbes et cônes pour cartographier la possibilité du mouvement : une représentation tridimensionnelle de l’espace-temps géographique Chinois. 2021
Dylan Moinse, Matthieu Goudeau, Alain L'Hostis
Une analyse de l'usage intermodal des trottinettes avec le train dans la région Provence-Alpes-Côte d’Azur. Vers une extension des quartiers de gare ?. Future Days - Mobilité décarbonée (session 2), Nov 2021, Marne-la-Vallée, France
Wassim Hached, Alain L'Hostis
Le Mobility hub : un véritable allié de la mobilité urbaine durable ? Instauration d'un cadre conceptuel pour évaluer deux expériences Européennes à Valenciennes et Norfolk. JM RST 2021 : Journées Mobilités du Réseau Scientifique et Technique, Sep 2021, Lyon, France
Wassim Hached, Alain L'Hostis
Émergence des " Mobility hubs" comme outils d'une mobilité urbaine durable ? Définition et évaluation de deux expériences européennes à Valenciennes et Norfolk. Future Days, Nov 2021, Marne-la-Vallée, France
Alain L'Hostis, Jean-François Barbier
Villes qui se rapprochent, espace qui s'éloigne: outils visuels pour représenter le paradoxe de l'espace-temps géographique. Talweg - La distance, 2021, 06, pp60-67
Benoît Kloeckner, Alain L'Hostis, Thomas Richard
Contextual metrics. A mathematical definition for a comprehensive approach of geographical distances. Geographical Analysis, 2020
10.1111/gean.12260
Mirko Goletz, Sonja Haustein, Christina Wolking, Alain L'Hostis
Intermodality in European metropolises: The current state of the art, and the results of an expert survey covering Berlin, Copenhagen, Hamburg and Paris. Transport Policy, 2020, 94, pp.109-122
10.1016/j.tranpol.2020.04.011
Claire Tollis, Alain L'Hostis, Redha Boubakour
Low Appetite for High Tech: When the Indifference of Inhabitants to Digital Mobilities Impedes a Smart Suburbs Project in Loos-en-Gohelle, France. International Journal of Urban Planning and Smart Cities (IJUPSC), 2020, 1 (1), pp45-57
10.4018/IJUPSC.2020010104
Alain L'Hostis
All geographical distances are optimal. Cybergeo : Revue européenne de géographie / European journal of geography, 2020, 947
10.4000/cybergeo.35048
Arnaud Can, Alain L'hostis, Pierre Aumond, Dick Botteldooren, Margarida C Coelho, et al.
The future of urban sound environments: Impacting mobility trends and insights for noise assessment and mitigation. Applied Acoustics, 2020, 170, pp1-8
10.1016/j.apacoust.2020.107518
Claire Tollis, Alain L'Hostis, Redha Boubakour
Low Appetite for High Tech: When the Indifference of Inhabitants to Digital Mobilities Impedes a Smart Suburbs Project. International Journal of Urban Planning and Smart Cities (IJUPSC), 2020, 1 (1), pp.45-57
10.4018/IJUPSC.2020010104
Claire Tollis, Alain L'Hostis, Redha Boubakour
Quand la participation des habitants retoque le projet d'un périurbain intelligent. Enseignements d'un programme de recherche-action sur les mobilités durables à Loos-en-Gohelle (62). revue Urbanités, 2019, 12, 11p
Nathan Bounie, François Adoue, Martin Koning, Alain L'Hostis
What value do travelers put on connectivity to mobile phone and Internet networks in public transport? Empirical evidence from the Paris region. Transportation Research : Part A, Policy and Practice, 2019, 130, pp158-177
10.1016/j.tra.2019.09.006
Alain L'Hostis, Thomas Leysens, Liu Liu
Contribution de la future ligne ferroviaire à grande vitesse Tours-Bordeaux au développement des réseaux des villes, une évaluation par le potentiel de contact. Cybergeo : Revue européenne de géographie / European journal of geography, 2018
10.4000/cybergeo.29365
Francis Papon, Alain L'Hostis
La mobilité produit l'urbanisme, et inversement. La jaune et la rouge [revue mensuelle de la société amicale des anciens élèves de l'Ecole Polytechnique], 2018, 738, 5p
Eleni Chalkia, Maria Teresa de La Cruz, Imre Keseru, Alain L'Hostis, Beate Muller
Societal Trends Influencing Mobility and Logistics in Europe: A Comprehensive Analysis.. Towards User-Centric Transport in Europe, Challenges, Solutions and Collaborations Challenges, Solutions and Collaborations, Springer Nature, pp. 31-49, 2018, Lecture Notes in Mobility
10.1007/978-3-319-99756-8_3
Alain L'Hostis
Detour and break optimising distance, a new perspective on transport and urbanism. Environment and Planning B: Planning and Design, 2017, 44 (3), pp.441-463
10.1177/0265813516638849
Hélène Jacquot-Guimbal, Jean-Bernard Kovarik, Latifa Oukhellou, Alain L'Hostis, Guillaume Uster
Réussir les transitions que nous sommes en train de vivre. Point de vue de la directrice de l'Institut Francais des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux - Ifsttar. TEC Mobilité intelligente [Revue TEC : Transport Environnement Circulation], 2017, 232, 2p
Alain L'Hostis, Liu Liu, Thomas Leysens
Using contact potential measurements to analyse future intercity links made possible by the Tours-Bordeaux High-Speed Rail line. Belgeo : Revue Belge de Géographie, 2017, 1
10.4000/belgeo.19584
Alain L'Hostis, Claude Soulas, Bogdan Vulturescu
A Multi‐criteria approach for choosing a new public transport system linked to urban development: a method developed in the Bahn.Ville project for a tram‐train scenario in the Saint‐Étienne region. RTS. Recherche, transports, sécurité, 2017, 2016 (01-02), pp.17-25
10.4074/S0761898016002028
Anne Aguilera-Belanger, Nacima Baron, J
Berrada, O. Bonin, V. Boutueil, et al.. Les mots du LVMT (Laboratoire Ville Mobilité Transport). 2017
Eleni Chalkia, Beate Mueller, Alain L'Hostis
The role of societal resistance in transportation innovation. 8th International Congress on Transportation Research: Transportation by 2030: Trends and perspectives, Sep 2017, THESSALONIKI, France. pp.12P
10.5281/zenodo.1216917
Alain L'Hostis
Les périmètres du Transit Oriented Development : caractérisation de la relation entre ville et transport collectifs. 2016
Alain L'Hostis, Beate Muller, Gereon Meyer, Annette Bruckner, Erzsebet Foldesi, et al.
MOBILITY4EU - D2.1 - Societal needs and requirements for future transportation and mobility as well as opportunities and challenges of current solutions. [Research Report] IFSTTAR - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux. 2016, 85p
Alain L'Hostis, Leysens Thomas, Liu Liu
"Potentiel de contact" des villes. FNAU. Abécédaire Systèmes territoriaux régionaux, , 2016
Alain L'Hostis
Shriveling time-space relief representation of the world at the time of Concorde 1977-2003. Computer graphics. France. 2016
Alain L'Hostis
Misunderstanding geographical distances: two errors and an issue in the interpretation of violations of triangle inequality. Cybergeo : Revue européenne de géographie / European journal of geography, 2016
Alain L'Hostis
The first unparametrized image of the shrivelled world. author A L'Hostis 2016. Computer graphics. France. 2016
Monica Coralli, Alain L'Hostis
Le train et la ville : un jeu de distances et de proximités. 2015
Alain L'Hostis, Sébastien Darchen
Characterising Transit Oriented Development in the Paris metropolitan region: what type of TOD are they?. 2015
Liu Liu, Alain L'Hostis
Transport and Land Use Interaction: A French Case of Suburban Development in the Lille Metropolitan Area (LMA). Transportation Research Procedia, 2014, Sustainable Mobility in Metropolitan Regions. mobil.TUM 2014. International Scientific Conference on Mobility and Transport. Conference Proceedings, 4, pp.120 - 139
10.1016/j.trpro.2014.11.011
Alain L'Hostis
Le détour, la pause et l'optimalité, Essai sur la distance et ses apports au transport et à l'urbanisme. Architecture, aménagement de l'espace. Université Paris-Est, 2014
Alain L'Hostis
Theoretical models of time-space: the role of transport networks in the shrinking and shrivelling of geographical space. Rozenblat Céline, Mélançon Guy. Multilevel Analysis and visualization of Geographical Networks, Springer, pp.55-66, 2013, Methodos Series, vol. 11
Alain L'Hostis, E Alexandre, M Appert, C Araud-Ruyant, M Basty, et al.
Rapport intermédiaire du projet Bahn.Ville 2 recherche action pour un urbanisme orienté vers le rail dans la région stéphanoise. 2013
Anne Aguilera, Alain L'Hostis, Neil Paulley
Land-use and transport interactions: Towards a research agenda. European Transport Conference, Sep 2013, Francfort, Germany. pp.x-x
L Halbert, M-N Comin, C Ducruet, Alain L'Hostis, D Peeters, et al.
Analyse comparative des métropoles européennes, rapport final, DATAR. 2013
Alain L'Hostis
Contactability p. 85-90 in Accessibility Instruments for Planning Practice edited by A. Hull, C. Silva, L. Bertolini, COST action Accessibility Instruments. 2013
Alain L'Hostis, Claude Soulas, Gebhard Wulfhorst
La ville orientée vers le rail et l'intermodalité. Gérard Brun. Ville et mobilité, nouveaux regards, Economica, pp.115-126, 2013, Méthodes et Approches, 978-2-7178-6627-8
Alain L'Hostis, E Alexandre, M Appert, C Araud-Ruyant, M Basty, et al.
Concevoir la ville à partir des gares, rapport final du Projet Bahn.Ville 2 sur un urbanisme orienté vers le rail, octobre. 2013
Alain L'Hostis, Thomas Leysens
Les méthodes de mesure et de représentation de l'accessibilité dans les méthodes d'évaluation des projets de transport interurbains et périurbains de voyageurs: méthode, indicateurs, applications et limites de la contactabilité.. 2012
Petter Christiansen, Olav Eidhammer, Jardar Andersen, Alain L'Hostis, G Adamos, et al.
Case studies: results and synthesis projet 7FP CLOSER (Connecting LOng and Short-distance networks for Efficient Transport) Rapport de recherche Deliverable 5.2 project européen CLOSER.. [Research Report] European Commission. 2012
Yves Crozet, Alain L'Hostis, Benjamin Collin, Anne-Laure Jeannez
Transport public et développement urbain durable en France et aux USA; partie relative au cas français. 2012
Alain L'Hostis
Métropoles sans aéroport international ? La contribution de l'intermodalité TGV-aérien au potentiel de contact des villes françaises dans le réseau des métropoles européennes. Colloque : L'intermodalité en questions - Durabilité, accessibilité, mobilité, Jun 2012, Montpellier, France
Alain L'Hostis
Le foncier des environs de gare, enjeu d'un développement urbain orienté vers le rail. Etudes foncières, 2011, 3p
Alain L'Hostis
Le foncier des environs de gare, enjeu d'un développement urbain orienté vers le rail. Etudes foncières, 2011, pp.3
Eftihia Nathanail, G
Adamos, Alain L'Hostis, L. Parra, E. Ruiz-Ayucar, et al.. Deliverable D4.1 Analysis of the Decision-Making framework, projet 7FP CLOSER (Connecting LOng and Short-distance networks for Efficient tRansport), july 2011. Deliverable D4.1, 2011
Nathanail Eftithia, G Adamos, L Parra, E Ruiz-Ayucar, Alain L'Hostis, et al.
Deliverable D32 Core indicators for the interconnection between short and long-distance transport networks ; projet 7FP CLOSER (Connecting LOng and Short-distance networks for Efficient Transport); September 2011. [Research Report] European Commission. 2011
Ludovic Halbert, Patricia Cicille, Marie-Noëlle Cornin, César Ducruet, Alain L'Hostis, et al.
Analyse comparative des métropoles européennes. 2011, 334 p
Alain L'Hostis
Les transports du polycentrisme européen, une analyse par la contactabilité entre métropoles. 11ème colloque du groupe de travail Mobilités Spatiales et Fluidité Sociale (MSFS) de l'Association Internationale des Sociologues de Langue Française (AISLF) : Mobilités spatiales et ressources métropolitaines : l'accessibilité en questions, Mar 2011, Grenoble, France
Alain L'Hostis
Contactability measures for assessing the competitiveness of European cities and networks of cities: the potential for high-speed rail and air to support a polycentric development. European Transport Conference ETC 2011, Oct 2011, Glasgow, United Kingdom
Alain L'Hostis, Thomas Leysens, Johannes Keller
Fostering rail-based accessibility by land management. European Transport Conference ETC 2011, Oct 2011, Glasgow, United Kingdom
Alain L'Hostis
El predial en el entorno de una estación ferroviaria Implicación de un desarrollo urbano orientado hacia el riel. Transporte y ciudad, foro de la movilidad, 2011, 3, pp.40-42
B
Vulturescu, Alain L'Hostis, C. Soulas. Simulation des temps de parcours du transport ferroviaire régional du bassin de vie stéphanois dans le cadre du projet Bahn.Ville. RTS. Recherche, transports, sécurité, 2011, 27 (4), pp.283-297
10.1007/s13547-011-0027-z
Ludovic Halbert, Marie Noëlle Comin, César Ducruet, Alain L'Hostis, D
Peeters, et al.. Analyse comparative des métropoles européennes. 2011, 248 p
Alain L'Hostis, Alexis Conesa
Defining Intermodal Accessibility. in A Banos and Th Thévenin (eds). Geographical Information and Urban Transport System, Geographical Information Series, ISTE/Wiley, pp. 53-81, 2011
Alain L'Hostis, Sandra Bozzani-Franc
Contactability measures for assessing urban competitiveness. 2010
G Wulfhorst, Alain L'Hostis, H Pretsch, S Morkisz, V Stransky, et al.
An urbanism oriented towards rail in Germany and France, three main findings of a research-action program. General Proceedings of the 12th World Conference on Transport Research Society, Jul 2010, Lisbon, Portugal
Sandra Bozzani-Franc, Thomas Leysens, Alain L'Hostis, Claude Soulas, Bogdan Vulturescu
Un Urbanisme orienté vers le rail illustré par le projet Bahn.Ville. Claude Soulas, Martine Wahl. Innovation dans les transports guidés urbains et régionaux, Hermès, p. 253-302, 2010
Alain L'Hostis, Gebhard Wulfhorst, Sabina Morkisz, Hélène Pretsch, Vaclav Stransky, et al.
An Urbanism oriented towards rail in Germany and France: selected findings of the Bahn.Ville project. 2010
Moritz Lennert, Gilles van Hamme, Catherine Patris, Maciej Smętkowski, Adam Płoszaj, et al.
FOCI Future Orientation for Cities. 2010
Alain L'Hostis, Alexis Conesa
Définir l'accessibilité intermodale. Arnaud Banos, Thomas Thévenin. Systèmes de Transport Urbain, Hermès, pp.24, 2010, IGAT
Alain L'Hostis, Elsa Alexandre, Manuel Appert, Catherine Araud-Ruyant, Marius Basty, et al.
Concevoir la ville à partir des gares, Rapport final du Projet Bahn.Ville 2 sur un urbanisme orienté vers le rail. 2009
Alain L'Hostis
The shriveled USA: Representing time-space in the context of metropolitanization and the development of high speeds. Journal of Transport Geography, 2009, 17, pp.433-439
10.1016/j.jtrangeo.2009.04.005
Alain L'Hostis
Mesurer l'accessibilité intermodale pour mieux relier l'organisation des réseaux et l'organisation territoriale dans la région urbaine de Lille. MobilTUM, Apr 2008, München, Allemagne
Alain L'Hostis, S Bozzani-Franc
Air and high-speed rail, territorial impact and opportunities for metropolitan performance. LINK european project final conference, Jun 2008, Köln, Germany
Reg Harman, Philippe Menerault, Alain L'Hostis
Public transport in cities and regions, Facing an uncertain future?. Ph. Booth, M. Breuillard, C. Fraser, D. Paris. Spatial Planning Systems of Britain and France, A comparative analysis, Routledge, pp.188-205, 2007
Alain L'Hostis
Graph theory and representation of distances : chronomaps, and other representations. Mathis Ph. Graphs and networks, multilevel modelling,, Lavoisier, pp.177-191, 2007
Alain L'Hostis, Gebhard Wulfhorst, Benjamin Puccio, Catherine Araud-Ruyant
Urbanisme et transport dans les régions urbaines : enjeux et perspectives d'un urbanisme orienté vers le rail. RTS. Recherche, transports, sécurité, 2007, 94, pp.11-26
10.3166/rts.94.11-26
Alexis Conesa, Alain L'Hostis
Accessibilité horaire des transports collectifs, un outil d'analyse pour la relation entre transport et aménagement du territoire. Journée d’échanges sur l’accessibilité des voyageurs en interurbain : enjeux et méthodes, Réseau des Economistes Transport et Aménagement (RETA), Apr 2007, La Défense, Paris, France
Sabine Avril, Sandra Bozzani-Franc, Alain L'Hostis, Francesca Pico, Jacques Bize, et al.
Strategic Research Agenda for Urban Mobility. 2007
Alain L'Hostis, Sandra Bozzani
Lille, une métropole sans aéroport international ? Analyse de la performance territoriale du nœud air-fer à grande vitesse de Roissy Charles de Gaulle dans l'accessibilité lilloise. RTS. Recherche, transports, sécurité, 2006, 46, pp.157-170
10.3166/rts.92.155-170
Philippe Menerault, Alain Barré, Alexis Conesa, Alain L'Hostis, Paola Pucci, et al.
Multipolarités urbaines et nouvellles organisations intermodales. 2006
Philippe Menerault, Alain Barré, Alexis Conesa, Alain L'Hostis, Paola Pucci, et al.
Multipolarités urbaines et nouvelles organisations intermodales. 2006, 126p
Céline Rozenblat, G
Melançon, D. Auber, C. Discazeaux, Alain L'Hostis, et al.. Worldwide Multi-Level Networks of Cities Emerging From Air Traffic (2000). Rubén C. Lois González. Urban changes in differents scales. Systems and structures, University of Santiago de Compostela, Publications Service, pp.n.c., 2006
Alain L'Hostis, Hervé Baptiste
A Transport network for a City network: Analysing the quality of the public transport service in the Nord-Pas-de-Calais region. European Journal of Spatial Development, 2006, 20, 18 p
Alain L'Hostis, Philippe Menerault, Christophe Decoupigny
Assessing Spatial Planning Policy with Accessibility Indicators: the case of Lille's Metropolis Scenario. Beuthe M., Himanen V., Reggiani A., Zamparini L. Transport Development and Innovation in an Evolving world, Springer, pp.293-312, 2004
Philippe Menerault, Alain L'Hostis
Projets de grande vitesse ferroviaire en Grande-Bretagne : lignes ou réseau ?. Hommes et Terres du Nord, 2003, 3, pp.43-54
Alain L'Hostis
Théorie des graphes et représentations des distances : chronocartes et autres représentations. Philippe Mathis. Graphes et réseaux, modélisation multiniveau, Lavoisier, pp.215-230, 2003, Information Géographique et Aménagement du Territoire
Alain L'Hostis
De l'Espace contracté à l'espace chiffonné : Apports de l'animation à la cartographie en relief des distances-temps modifiées par les réseaux de transport rapides. Revue Internationale de Géomatique, 2003, 13, pp.69-80
Alain L'Hostis, Christophe Decoupigny, Philippe Menerault, Nicolas Morice
Cadencement et intermodalité de l'offre en transport collectif en Nord-Pas-de-Calais, Analyse et propositions d'amélioration. 2001, 121p
Philippe Menerault, Alain L'Hostis
Analyse des relations réseaux/territoires : restructuration de l'offre ferroviaire de l'axe Lille/Valenciennes/Jeumont. 2000, 85p
Alain L'Hostis
Images de synthèse pour l'Aménagement du territoire : la déformation de l'espace par les réseaux de transport rapide. Géographie. Université François Rabelais - Tours, 1997. Français
Alain L'Hostis
Transports et aménagement du territoire : cartographie par images de synthèse d'une métrique réseau. M@ppemonde, 1996, 3, pp.37-43
Alain L'Hostis
The first time-space relief cartography, analog photo of cathodic screen, Europe. Computer graphics. France. 1994
Alain L'Hostis, Philippe Mathis, Nadine Polombo
Les grandes vitesses. Alain Bonnafous; François Plassard; Bénédicte Vulin. Circuler demain, Datar / éditions de l'aube, 1993, 2-87678-126-3

test geoloc

Tijero, E. Domínguez, Fernández, L. Martínez, Herrero Zarzosa, Jorge Javier, Ibañez-Guzmán, J., Stawiarski, E., Xu, Philippe, Avellone, G., Pisoni, F., Falletti, E., ORTIZ, Miguel, 2018, High Accuracy Positioning Engine with an Integrity Layer for Safety Autonomous Vehicles, Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation , MIAMI, ETATS-UNIS, 2018-09-24, Wiley-Blackwell, pp. 1566-1572, DOI: 10.33012/2018.15843

https://www.ion.org/publications/abstract.cfm?articleID=15843

Plus d'infos

ANTIGNY, Nicolas, SERVIERES, Myriam, RENAUDIN, Valérie, 2018, Continuous Pose Estimation for Urban Pedestrian Mobility Applications on Smart-Handheld Devices, 2018 International Conference on Indoor Positioning and Indoor Navigation (IPIN), Nantes, FRANCE, 2018-09-24, IEEE, 8 p, DOI: 10.1109/IPIN.2018.8533680

https://ieeexplore.ieee.org/abstract/document/8533680/citations#citations

Plus d'infos

TAIA ALAOUI, Fadoua, 2018, Navigation des personnes aux moyens des technologiesdes smartphones et des données d'environnements cartographiés, Thèse de doctorat de l'école centrale de Nantes, Spécialité: Signal, Image, Vision, Université Bretagne-Loire, 153 p

Télécharger le document

ORTIZ, Miguel, PERUL, Johan, TORRES-SOSPEDRA, Joaqim, RENAUDIN, Valérie, 2018, Datasets and Supporting Materials for the IPIN 2018 Competition Track 4, IPIN 2018, 9th International conference on Indoor Positioning and Indoor Navigation, Nantes, FRANCE, 2018-09-24, DOI: 10.5281/zenodo.3228012

https://zenodo.org/record/3228012#.XPUsb4_fPmE

Plus d'infos

ANTIGNY, Nicolas, SERVIERES, Myriam, RENAUDIN, Valérie, 2018, Continuous Pose Estimation for Urban Pedestrian Applications on Hand-held Mobile Device, IPIN' 18, International Conference on Indoor Positioning and Indoor Navigation, Nantes, France, 2018-09-24, Institute of Electrical and Electronics Engineers - IEEE

Plus d'infos

ABID, Mahdi, RENAUDIN, Valérie, ROBERT, Thomas, AOUSTIN, Yannick, LE CARPENTIER, Eric, 2018, A Simulation-based Approach to Generate Walking Gait Accelerations for Pedestrian Navigation Solutions, IPIN'18, International Conference on Indoor Positioning and Indoor Navigation, Nantes, France, 2018-09-24, Institute of Electrical and Electronics Engineers - IEEE, 8 p.

Plus d'infos

PERUL, Johan, RENAUDIN, Valérie, 2018, Building individual inertial signals models to estimate PDR walking direction with smartphone sensors, IPIN'18, International Conference on Indoor Positioning and Indoor Navigation, NANTES, FRANCE, 2018-09-24, September, Institute of Electrical and Electronics Engineers - IEEE, p. 24-27

Plus d'infos

ZHU, Ni, 2018, Modélisation du canal de propagation GNSS en milieu contraint: Contribution à l'amélioration de la qualité de service de géolocalisation , Thèse de Doctorat, Discipline Sciences de l'information et de la communication, Université de Lille, 220p

Télécharger le document

ABIB, Mahdi, 2018, Walking gait features extraction and characterization using wearable devices, Thèse de doctorat de l'Ecole Centrale de Nantes, spécialité : Automatique, productique, robotique, L'ÉCOLE CENTRALE DE NANTES, Ecole Centrale de Nantes, 168

Télécharger le document

ANTIGNY, Nicolas, 2018, Estimation continue de la pose d'un équipement tenu en main par fusion des données visio-inertielles pour les applications de navigation piétonne en milieux urbains, Thèse de doctorat. Spécialité : Signal, Image, Vision, Université Loire Bretagne, 114 p

Télécharger le document

RENAUDIN, Valérie, 2018, Integrating human dimension in the development of pedestrian navigation, ITSNT 2018, International Technical Symposium on Navigation and Timing, TOULOUSE, FRANCE, 2018-11-13, 34p

http://www.itsnt.fr/

Télécharger le document

RENAUDIN, Valérie, KHAMITOVA, Aigul, ORTIZ, Miguel, 2018, IPIN 2018 - Ninth International Conference On Indoor Positioning And Indoor Navigation, IPIN 2018, Nantes, France, 2018-09-24, IFSTTAR, 183 p.

Télécharger le document

MANZINI, Nicolas, ORCESI, André, THOM, Christian, CLEMENT, Antoine, BOTTON, Serge, ORTIZ, Miguel, DUMOULIN, John, 2018, Structural Health Monitoring using a GPS sensor network, EWSHM'18, 9th European Workshop on Structural Health Monitoring Series, MANCHESTER, ROYAUME-UNI, 2018-07-10, British Institute of Non Destructive Testing, 12 p.

Plus d'infos

MANZINI, Nicolas, ORCESI, André, THOM, Christian, BOTTON, Serge, CLEMENT, Antoine, ORTIZ, Miguel, DUMOULIN, John, 2018, Use of low-cost GNSS receivers for Structural Health Monitoring, 40th IABSE Symposium : Tomorrow's Megastructures, NANTES, FRANCE, 2018-09-19, International Association for Bridge and Structural Engineering - IABSE, 8 p.

Plus d'infos

RENAUDIN, Valérie, 2018, Human dimensions of navigation, The Israel Navigation Workshop and Exhibition INWE18, Hertzliya, ISRAEL, 2018-01-29

Plus d'infos

RENAUDIN, Valérie, 2018, Préparation de la compétition internationale de localisation intérieure IPIN : cartographie de parcours piétons, Forum de l'Association Française de Topographie , Anglet, FRANCE, 2018-03-29

Télécharger le document

RENAUDIN, Valérie, MOREAU, Nicolas, BILLEY, Antoine, LAMBLIN, Alexandre, VOS, Jasper, PERUL, Johan, ORTIZ, Miguel, 2018, Préparation de la compétition internationale de localisation intérieure IPIN : cartographie de parcours piétons, XYZ, 155, Association Française de Topographie - AFT, pp. 17-21

Plus d'infos

ANTIGNY, Nicolas, SERVIERES, Myriam, RENAUDIN, Valérie, 2018, Fusion of 3D GIS, Vision, Inertial and Magnetic Data for Improved Urban Pedestrian Navigation and Augmented Reality Applications, Navigation, WILEY, DOI: 10.1002/navi.254

http://doi.wiley.com/10.1002/navi.254

Plus d'infos

PEYRET, François, GILLIERON, Pierre Yves, EUROPEAN COOPERATION IN THE FIELD OF SCIENTIFIC AND TECHNICAL RESEARCH - COST, 2018, SaPPART Guidelines: Performance assessment of positioning terminals, Techniques et méthodes, TMI 3, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux - IFSTTAR, 45p

Télécharger le document

DOMINGUEZ TIJERO, Enrique, CHAMORRO MORENO, A, FERNANDEZ CALZON, Maria-theresa, GARCIA, J, IBANEZ GUZMAN, J, XU, Philippe, AVELLONE, GIUSEPPE, PISONI, Fabio, FALLETTI, Emmanuela, ORTIZ, Miguel, 2019, Autonomous vehicle high-accuracy position and integrity engine performance results , 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), MIAMI, ETATS-UNIS, 2019-09-16, Institute of Navigation, 9 p, DOI: 10.33012/2019.16872

Télécharger le document

PERUL, Johan, RENAUDIN, Valérie, 2019, Fusion of Attitude and Statistical Walking Direction Estimations with Time-Difference Carrier Phase Velocity Update for Pedestrian Dead Reckoning Method, ION GNSS+'19, 32nd International Technical Meeting of the Satellite Division of The Institute Of Navigation, MIAMI, ETATS-UNIS, 2019-09-16, WILEY, p. 367-377, DOI: 10.33012/2019.17035

Télécharger le document

ZHU, Ni, ORTIZ, Miguel, RENAUDIN, Valérie, 2019, Seamless Indoor-Outdoor Infrastructure-free Navigation for Pedestrians and Vehicles with GNSS-aided Foot-mounted IMU, 2019 International Conference on Indoor Positioning and Indoor Navigation (IPIN), PISE, ITALIE, 2019-09-30, Institute of Electrical and Electronics Engineers - IEEE, 8 p.

Plus d'infos

GRENIER, Antoine, RENAUDIN, Valérie, 2019, Efficient Use of SSR RTCM Streams For Real-Time Precise Point Positioning on Smartphones, WPNC19, 16th Workshop on Positioning, Navigation and Communications, BREME, ALLEMAGNE, 2019-10-23, Institute of Electrical and Electronics Engineers - IEEE, 28 p.

Plus d'infos

GRENIER, Antoine, RENAUDIN, Valerie, 2019, Efficient Use of SSR RTCM Streams For Real-Time Precise Point Positioning on Smartphones Main objective Investigate precise positioning , in real-time , on Android Device using RTCM streams for low computation costs, WPNC'19, 16th Workshop on Positioning, Navigation and Communications, BREME, ALLEMAGNE, 2019-10-23, Institute of Electrical and Electronics Engineers - IEEE, p. 1-18

Plus d'infos

RENAUDIN, Valérie, ORTIZ, Miguel, PERUL, Johan, TORRES-SOSPEDRA, Joaquín, RAMON JIMENEZ, Antonio, PEREZ-NAVARRO, Antoni, MENDOZA-SILVA, German Martin, SECO, Fernando, LANDAU, Yaël, MARBEL, Retival, BEN-MOSHE, Boaz, ZHENG, Xingyu, YE, Feng, KUANG, Jian, LI, Yu, NIU, Xiaoji, LANDA, Vlad, HACOHEN, Shlomi, SHVALD, Nir, LU, Shuanhua, UCHIYAMA, Ideaki, THOMAS, Diego, SHIMADA, Atsushi, TANIGUCHI, Rin-Ichiro, KRONENWETT, Nikolai, VLADIMIROV, Blagovest, LEE, Soyeon, CHO, Eunyoung, JUN, Sungwoo, LE, Changeun, -, -, 2019, Evaluating Indoor Positioning Systems in a Shopping Mall: The Lessons Learned From the IPIN 2018 Competition, IEEE ACCESS, 7, Institute of Electrical and Electronics Engineers - IEEE, 148594 - 148628, DOI: 10.1109/ACCESS.2019.2944389

https://ieeexplore.ieee.org/document/8852722/keywords#keywords

Télécharger le document

ANTIGNY, Nicolas, UCHIYAMA, Hideaki, SERVIERES, Myriam, RENAUDIN, Valérie, THOMAS, Diego, TANIGUCHI, Rin-ichiro, 2019, Solving Monocular Visual Odometry Scale Factor with Adaptive Step Length Estimates for Pedestrians Using Handheld Devices, sensors, 19, Multidisciplinary Digital Publishing Institute - MDPI, 1-18, DOI: 10.3390/s19040953

https://www.mdpi.com/1424-8220/19/4/953

Télécharger le document

PERUL, Johan, RENAUDIN, Valérie, 2019, Learning individual models to estimate the walking direction of mobile phone users, IEEE Sensors Journal, 10 p, IEEE, DOI: 10.1109/JSEN.2019.2940138

https://ieeexplore.ieee.org/document/8827533

Télécharger le document

RENAUDIN, Valérie, ORTIZ, Miguel, 2019, véhicules autonomes, 59e congrès annuel du club EEA , RENNES, FRANCE, 2019-06-12

https://clubeea2019.sciencesconf.org/

Télécharger le document

RENAUDIN, Valérie, 2019, Indoor positioning: towards an infinite number of technologies?, 10th Chinese Satellite Navigation Conference, BEIJING, CHINE, 2019-05-22, 20p

https://www.beidou.org/

Télécharger le document

PERUL, Johan, 2020, Localisation autonome par apprentissage des dynamiques de déplacement en transport multimodal, Thèse de doctorat, Mathématiques et Sciences et Technologies de l'Information et de la Communication. Spécialité : Automatique, Productique, Robotique, Ecole centrale de Nantes, 156p

https://www.ec-nantes.fr/centrale-nantes/actualites/soutenance-de-these-de-johan-perul-ed-mathstic

Télécharger le document

ZHU, Ni, ORTIZ, Miguel, RENAUDIN, Valérie, ICHARD, Cécile, RICOU, Sander, 2020, Dataset of the intermediate competition in Challenge MALIN: Indoor-outdoor inertial navigation system data for pedestrian and vehicle with high accuracy references in a context of firefighter scenario, Data in Brief, 34, Elsevier, 14p, DOI: 10.1016/j.dib.2020.106626

https://www.sciencedirect.com/science/article/pii/S2352340920315067

Télécharger le document

AL ABIAD, Naïma, RENAUDIN, Valérie, ROBERT, Thomas, 2020, Assessing gait variability from cellphone IMU placed in several locations: a feasibility study, Computer Methods in Biomechanics and Biomedical Engineering, 23, S1, TAYLOR AND FRANCIS, s1-s3, DOI: 10.1080/10255842.2020.1811490

https://www.tandfonline.com/doi/full/10.1080/10255842.2020.1811490

Télécharger le document

ORTIZ, Miguel, BENMEZIANE , Karim, 2020, CEN standards in GNSS for Road/Automotive. Benefits of using EN16803 series for the automotive sector, UCP, 3rd edition of the User Consultation Platform, Virtuel, 2020-12-01, 15p

https://www.gsa.europa.eu/user-consultation-platform-2020-ucp

Télécharger le document

MANZINI, Nicolas, ORCESI, André, THOM, Christian, BROSSAULT, Marc-Antoine, BOTTON, Serge, ORTIZ, Miguel, DUMOULIN, John, 2020, Performance analysis of low-cost GNSS stations for structural health monitoring of civil engineering structures, Structure and Infrastructure Engineering, Taylor & Francis Ltd, 61 p., DOI: 10.1080/15732479.2020.1849320

https://hal.archives-ouvertes.fr/hal-03032752
https://doi.org/10.1080/15732479.2020.1849320

Télécharger le document

RENAUDIN, Valérie, ORTIZ, Miguel, RAGOIN, Céline, 2020, Positionnement GNSS précis sur smartphone : une réalité proche ?, Groupede Travail GNSS et Positionnementde la CNIG, Bouguenais, FRANCE, 2020-10-16, 13p

http://cnig.gouv.fr/?page_id=12592

Télécharger le document

POTORTÌ, FRANCESCO, PARK, SANGJOON, CRIVELLO, ANTONINO, PALUMBO, FILIPPO, GIROLAMI, MICHELE, BARSOCCHI, PAOLO, LEE, SOYEON, TORRES-SOSPEDRA, JOAQUÍN, JIMENEZ, ANTONIO RAMÓN, PÉREZ-NAVARRO, ANTONI, MENDOZA-SILVA, GERMÁN M., SECO, FERNANDO, ORTIZ, Miguel, PERUL, JOHAN, RENAUDIN, Valérie, KANG, HYUNWOONG, PARK, SOYOUNG, LEE, JAE-HONG, PARK, CHAN GOOK, HA, JISU, HAN, JAESEUNG, PARK, CHANGJUN, KIM, KEUNHYE, LEE, YONGHYUN, GYE, SEUNGHUN, LEE, KEUMRYEOL, KIM, EUNJEE, CHOI, JEONGSIK, CHOI, YANG-SEOK, TALWAR, SHILPA, CHO, SEONG YUN, BEN-MOSHE, BOAZ, SCHERBAKOV, ALEX, ANTSFELD, LEONID, SANSANO-SANSANO, EMILIO, CHIDLOVSKII, BORIS, KRONENWETT, NIKOLAI, PROPHET, SILVIA, LANDAU, YAEL, MARBEL, REVITAL, ZHENG, Lingxiang, PENG, Ao, LIN, Zhichao, WU, Bang, MA, Chengqoi, POSLAD, Stefan, SELVIAH, David, WU, Wei, MA, Zixiang, ZHANG, Wenchao, 2020, The IPIN 2019 Indoor Localisation Competition - Description and Results, IEEE Access, Institute of Electrical and Electronics Engineers Inc., 46p, DOI: 10.1109/ACCESS.2020.3037221

10/11/2020

Télécharger le document

PERUL, Johan, RENAUDIN, Valérie, 2020, HEAD: smootH Estimation of wAlking Direction with a hand-held device embedding inertial, GNSS and magnetometer sensors, Navigation, Journal of the Institute of Navigation, WILEY, 17p, DOI: 10.1002/navi.389

https://onlinelibrary.wiley.com/doi/pdf/10.1002/navi.389

Télécharger le document

PONTE MULLER, Fabian, MUNOZ DIAZ, Estefania, PERUL, Johan, RENAUDIN, Valérie, 2020, Urban vulnerable road user localization using gnss, inertial sensors and ultra-wideband ranging, IEEE-IV'2020, IEEE Intelligent Vehicles Symposium, LAS VEGAS, ETATS-UNIS, 2020-10-20, Institute of Electrical and Electronics Engineers - IEEE, 7p

https://elib.dlr.de/134960/

Plus d'infos

ZHU, Ni, BETAILLE, David, MARAIS, Juliette, BERBINEAU, Marion, 2020, GNSS Integrity Monitoring Schemes for Terrestrial Applications in Harsh Signal Environments, IEEE Intelligent Transportation Systems Magazine , Institute of Electrical and Electronics Engineers - IEEE, 11p, DOI: 10.1109/MITS.2020.2994076

https://ieeexplore.ieee.org/document/9113715

Plus d'infos

KONE, Yacouba, ZHU, Ni, RENAUDIN, Valérie, ORTIZ, Miguel, 2020, Machine Learning-Based Zero-Velocity Detection for Inertial Pedestrian Navigation, IEEE Sensors Journal, Institute of Electrical and Electronics Engineers - IEEE, 11p, DOI: 10.1109/JSEN.2020.2999863

https://ieeexplore.ieee.org/document/9107252

Télécharger le document

RUOTSALAINEN, Laura, RENAUDIN, Valérie, PEI, Ling, PIRAS, Marco, MARAIS, Juliette, CAVALHERI, Emerson, KAASALAINEN, Sanna, 2020, Toward Autonomous Driving in Arctic Areas, IEEE Intelligent Transportation Systems Magazine, IEEE, 15 p., DOI: 10.1109/MITS.2020.2994014

https://ieeexplore.ieee.org/document/9115644
https://hal.archives-ouvertes.fr/hal-02877232

Télécharger le document

RAGOIN, Céline, RENAUDIN, Valérie, ORTIZ, Miguel, 2020, Precise positioning on smartphones: which implementation strategy to adopt?, GNSS'20, 4th Global Navigation Satellite Systems Raw Measurements Taskforce Workshop, PRAGUE, TCHÈQUE, RÉPUBLIQUE, 2020-05-27, 12p.

https://www.gsa.europa.eu/sites/default/files/expo/3.5_celine_ragoin_miguel_ortiz_-_uni_gustave_eiffel.pdf

Télécharger le document

DULERY, Christelle, ORTIZ, Miguel, LEBLAN, Xavier, 2020, EN 16803/ Référentiel Européen de géolocalisation pour certifier les solutions de Mobilité, RDMI'20, 47ème Congrès ATEC ITS France, les Rencontres De la Mobilité Intelligente, Montrouge, FRANCE, 2020-01-22, 9p

https://guide-gnss.com/wp-content/uploads/2020/01/ATEC-ITS-Metrologie-GNSS-Referentiel-Europeen-de-geolocalisation-pour-certifier-les-solutions-de-Mobilite.pdf

Télécharger le document

Html

Ma liste perso html

Voici ma page web

Ceci est maliste html Ceci est mon texte.

Un lien vers mon site Web préféré.


hal api rss

HAL : Dernières publications

  • [hal-04329186] Embedding phylogenetic trees in networks of low treewidth

    Given a rooted, binary phylogenetic network and a rooted, binary phylogenetic tree, can the tree be embedded into the network? This problem, called \textsc{Tree Containment}, arises when validating networks constructed by phylogenetic inference methods.We present the first algorithm for (rooted) \textsc{Tree Containment} using the treewidth $t$ of the input network $N$ as parameter, showing that the problem can be solved in $2^{O(t^2)}\cdot|N|$ time and space.

  • [hal-04322837] Testing Uncorrelation of Multi-Antenna Signals Using Linear Spectral Statistics of the Spatio-Temporal Sample Autocorrelation Matrix

    We consider the use of the spatio-temporal sample autocorrelation matrix in order to determine whether the signals received by a distributed antenna system are spatially correlated. The asymptotic behavior of linear spectral statistics built from this matrix is studied, assuming that (i) the number of antennas, (ii) the sample size and (iii) the number of tested time lags all converge to infinity. In this asymptotic regime, linear spectral statistics of the spatiotemporal sample correlation matrix are shown to be asymptotically equivalent to the corresponding functional average with respect to a Marchenko-Pastur distribution. This means that the eigenvalue distribution of the original sample autocorrelation matrix essentially behaves as a sample covariance matrix of spatio-temporal white noise with equivalent dimensions. This result turns out to be useful in order to address the problem of detecting the presence of wideband directional signals with a number of uncalibrated receivers distributed over a large area.

  • [hal-04328553] Cohérence spectrale et test de corrélation en grande dimension

    Dans cet article, nous étudions un test de corrélation pour les composantes d'une série temporelle gaussienne complexe multivariée de dimension M. Une statistique de test basée sur un estimateur empirique du maximum de la cohérence spectrale est proposée, et son risque de 1ère espèce est étudié dans un régime asymptotique des grandes dimensions où M → ∞. Nous donnons également quelques résultats numériques illustrant les performances de la statistique proposée dans divers scénarios.

  • [hal-04328458] FLAIR: a Country-Scale Land Cover Semantic Segmentation Dataset From Multi-Source Optical Imagery

    We introduce the French Land cover from Aerospace ImageRy (FLAIR), an extensive dataset from the French National Institute of Geographical and Forest Information (IGN) that provides a unique and rich resource for large-scale geospatial analysis. FLAIR contains high-resolution aerial imagery with a ground sample distance of 20 cm and over 20 billion individually labeled pixels for precise landcover classification. The dataset also integrates temporal and spectral data from optical satellite time series. FLAIR thus combines data with varying spatial, spectral, and temporal resolutions across over 817 km2 of acquisitions representing the full landscape diversity of France. This diversity makes FLAIR a valuable resource for the development and evaluation of novel methods for large-scale land-cover semantic segmentation and raises significant challenges in terms of computer vision, data fusion, and geospatial analysis. We also provide powerful uni- and multi-sensor baseline models that can be employed to assess algorithm’s performance and for downstream applications. Through its extent and the quality of its annotation, FLAIR aims to spur improvements in monitoring and understanding key anthropogenic development indicators such as urban growth, deforestation, and soil artificialization. Dataset and codes can be accessed at https://ignf.github.io/FLAIR

  • [hal-04327914] FLOT: Scene Flow on Point Clouds guided by Optimal Transport

    We propose and study a method called FLOT that estimates scene flow on point clouds. We start the design of FLOT by noticing that scene flow estimation on point clouds reduces to estimating a permutation matrix in a perfect world. Inspired by recent works on graph matching, we build a method to find these correspondences by borrowing tools from optimal transport. Then, we relax the transport constraints to take into account real-world imperfections. The transport cost between two points is given by the pairwise similarity between deep features extracted by a neural network trained under full supervision using synthetic datasets. Our main finding is that FLOT can perform as well as the best existing methods on synthetic and real-world datasets while requiring much less parameters and without using multiscale analysis. Our second finding is that, on the training datasets considered, most of the performance can be explained by the learned transport cost. This yields a simpler method, FLOT0, which is obtained using a particular choice of optimal transport parameters and performs nearly as well as FLOT.

  • [hal-04327307] CoVR: Learning Composed Video Retrieval from Web Video Captions

    Composed Image Retrieval (CoIR) has recently gained popularity as a task that considers both text and image queries together, to search for relevant images in a database. Most CoIR approaches require manually annotated datasets, comprising image-text-image triplets, where the text describes a modification from the query image to the target image. However, manual curation of CoIR triplets is expensive and prevents scalability. In this work, we instead propose a scalable automatic dataset creation methodology that generates triplets given video-caption pairs, while also expanding the scope of the task to include composed video retrieval (CoVR). To this end, we mine paired videos with a similar caption from a large database, and leverage a large language model to generate the corresponding modification text. Applying this methodology to the extensive WebVid2M collection, we automatically construct our WebVid-CoVR dataset, resulting in 1.6 million triplets. Moreover, we introduce a new benchmark for CoVR with a manually annotated evaluation set, along with baseline results. Our experiments further demonstrate that training a CoVR model on our dataset effectively transfers to CoIR, leading to improved state-of-the-art performance in the zero-shot setup on both the CIRR and FashionIQ benchmarks. Our code, datasets, and models are publicly available at https://imagine.enpc.fr/~ventural/covr.

  • [hal-04326879] Sorting by prefix block-interchanges

    [...]

  • [hal-03633805] Assessing hierarchies by their consistent segmentations

    Current approaches to generic segmentation start by creating a hierarchy of nested image partitions and then specifying a segmentation from it. Our first contribution is to describe several ways, most of them new, for specifying segmentations using the hierarchy elements. Then, we consider the best hierarchy-induced segmentation specified by a limited number of hierarchy elements. We focus on a common quality measure for binary segmentations, the Jaccard index (also known as IoU). Optimizing the Jaccard index is highly non-trivial, and yet we propose an efficient approach for doing exactly that. This way we get algorithm-independent upper bounds on the quality of any segmentation created from the hierarchy. We found that the obtainable segmentation quality varies significantly depending on the way that the segments are specified by the hierarchy elements, and that representing a segmentation with only a few hierarchy elements is often possible. (Code is available).

  • [tel-04325869] Learning multi-modal distributions and image editing with deep generative models

    The past years have seen a great progress of deep generative models, including Generative Adversarial Networks (GANs). Notably, they can synthesize high-resolution images, sometimes indistinguishable from real images. Deep generative models were also at the root of empirical successes such as music generation or molecular discovery. However, we lack a fundamental understanding of the capabilities and limitations of deep generative models. In this thesis, we first characterize a model misspecification of generative models with connected output distributions, such as GANs or normalizing flows. Indeed, such models can not perfectly fit a target distribution composed of several disconnected modes. We analyse theoretically their best achievable performance in the setting of disconnected target distribution, and which geometrical structure can allow them to achieve best performance. Moreover, we propose methods that the performance of GANs by making them more amenable for disconnected data modelling.In the second part of the thesis, we aim to improve image editing techniques thanks to deep generative models. First, we leverage a pre-trained unconditional generative model and show that it can perform a wide range of image editing tasks without re-training. Second, we build on adversarial learning to improve virtual try-on models, which consist in replacing the clothing item on an image of a person.

  • [hal-04325383] A Tight Analysis of Geometric Local Search

    The last decade has seen the resolution of several basic NP-complete problems in geometric combinatorial optimisation-interestingly, all with the same algorithm: local search. This includes the existence of polynomial-time approximation schemes (PTASs) for hitting set, set cover, dominating set, independent set, and other problems for some basic geometric objects. More precisely, it was shown that for many of these problems, local search with radius λ gives a (1 + O(λ-1 2))approximation with running time n O(λ). Setting λ = Θ (ε-2) yields a PTAS with a running time of n O(ε-2). On the other hand, hardness results suggest that there do not exist PTASs for these problems with running time poly(n) • f (ε) for any arbitrary computable f. Thus the main question left open in previous work is in improving the exponent of n to o(ε-2). Our main result is that the approximation guarantee of the standard local search algorithm cannot be improved for any of these problems, which we show by constructing instances with poor "locally optimal solutions". The key ingredient, of independent interest, is a new lower bound on locally expanding planar graphs. Our construction extends to other graph families with small separators.

  • [hal-04324286] Odd Chromatic Number of Graph Classes

    A graph is called odd (respectively, even) if every vertex has odd (respectively, even) degree. Gallai proved that every graph can be partitioned into two even induced subgraphs, or into an odd and an even induced subgraph. We refer to a partition into odd subgraphs as an odd colouring of G. Scott [Graphs and Combinatorics, 2001] proved that a graph admits an odd colouring if and only if it has an even number of vertices. We say that a graph G is k-odd colourable if it can be partitioned into at most k odd induced subgraphs. We initiate the systematic study of odd colouring and odd chromatic number of graph classes. In particular, we consider for a number of classes whether they have bounded odd chromatic number. Our main results are that interval graphs, graphs of bounded modular-width and graphs of bounded maximum degree all have bounded odd chromatic number.

  • [hal-04323774] Untangling Graphs on Surfaces

    Consider a graph drawn on a surface (for example, the plane minus a finite set of obstacle points), possibly with crossings. We provide an algorithm to decide whether such a drawing can be untangled, namely, if one can slide the vertices and edges of the graph on the surface (avoiding the obstacles) to remove all crossings; in other words, whether the drawing is homotopic to an embedding. While the problem boils down to planarity testing when the surface is the sphere or the disk (or equivalently the plane without any obstacle), the other cases have never been studied before, except when the input graph is a cycle, in an abundant literature in topology and more recently by Despré and Lazarus [SoCG 2017, J. ACM 2019]. Our algorithm runs in O(m + poly(g+b) n log n) time, where g >= 0 and b >= 0 are the genus and the number of boundary components of the input orientable surface S, and n is the size of the input graph drawing, lying on some fixed graph of size m cellularly embedded on S. We use various techniques from two-dimensional computational topology and from the theory of hyperbolic surfaces. Most notably, we introduce reducing triangulations, a novel discrete analog of hyperbolic surfaces in the spirit of systems of quads by Lazarus and Rivaud [FOCS 2012] and Erickson and Whittlesey [SODA 2013], which have the additional benefit that reduced paths are unique and stable upon reversal; they are likely of independent interest. Tailored data structures are needed to achieve certain homotopy tests efficiently on these triangulations. As a key subroutine, we rely on an algorithm to test the weak simplicity of a graph drawn on a surface by Akitaya, Fulek, and Tóth [SODA 2018, TALG 2019].

  • [hal-04323747] Vehicular Cloud Computing for Population Evacuation Optimization

    This study focuses on online evacuation management. We design a framework to solve dynamic population evacuation (DPE) problems by creating an initial evacuation plan and employing inter-vehicle communication under a cloud computing architecture. For creating an initial plan, we formulate and solve dynamically (i) the shelter allocation problem (SAP) to choose a shelter node representing safety, and (ii) dynamic traffic assignment (DTA) to choose the best path leading towards the chosen destinations. The DPE process then begins with the planning phase to design a plan for the evacuation operation. Afterward, a vehicular ad hoc network (VANET) is deployed according to vehicular cloud computing (VCC) to make it possible for evacuees to share information and have online guidance from the server. We use vehicular communication to revise vehicle decisions initially taken by the plan, considering the dynamic progression of the catastrophe risk and congestion levels. To approve our new framework, we apply it to a real test case of Luxembourg city. We measure the clearance time and the mean evacuation time of the proposed solution and compare them with the results of other planning methods in the literature. Results show that online solving of DPE can minimize mean evacuation time and network clearance time by more than 10% compared to other models with only planning optimization. In addition, we analyze the performance of the proposed framework by changing the penetration rate of connected vehicles, and we observe that the increase in penetration rate leads to a decrease in network clearance time.

  • [hal-04323567] Going Beyond Nouns With Vision & Language Models Using Synthetic Data

    Large-scale pre-trained Vision & Language (VL) models have shown remarkable performance in many applications, enabling replacing a fixed set of supported classes with zero-shot open vocabulary reasoning over (almost arbitrary) natural language prompts. However, recent works have uncovered a fundamental weakness of these models. For example, their difficulty to understand Visual Language Concepts (VLC) that go 'beyond nouns' such as the meaning of non-object words (e.g., attributes, actions, relations, states, etc.), or difficulty in performing compositional reasoning such as understanding the significance of the order of the words in a sentence. In this work, we investigate to which extent purely synthetic data could be leveraged to teach these models to overcome such shortcomings without compromising their zero-shot capabilities. We contribute Synthetic Visual Concepts (SyViC) - a million-scale synthetic dataset and data generation codebase allowing to generate additional suitable data to improve VLC understanding and compositional reasoning of VL models. Additionally, we propose a general VL finetuning strategy for effectively leveraging SyViC towards achieving these improvements. Our extensive experiments and ablations on VL-Checklist, Winoground, and ARO benchmarks demonstrate that it is possible to adapt strong pre-trained VL models with synthetic data significantly enhancing their VLC understanding (e.g. by 9.9% on ARO and 4.3% on VL-Checklist) with under 1% drop in their zero-shot accuracy.

  • [hal-04323524] AutoAD II: The Sequel -- Who, When, and What in Movie Audio Description

    Audio Description (AD) is the task of generating descriptions of visual content, at suitable time intervals, for the benefit of visually impaired audiences. For movies, this presents notable challenges -- AD must occur only during existing pauses in dialogue, should refer to characters by name, and ought to aid understanding of the storyline as a whole. To this end, we develop a new model for automatically generating movie AD, given CLIP visual features of the frames, the cast list, and the temporal locations of the speech; addressing all three of the 'who', 'when', and 'what' questions: (i) who -- we introduce a character bank consisting of the character's name, the actor that played the part, and a CLIP feature of their face, for the principal cast of each movie, and demonstrate how this can be used to improve naming in the generated AD; (ii) when -- we investigate several models for determining whether an AD should be generated for a time interval or not, based on the visual content of the interval and its neighbours; and (iii) what -- we implement a new vision-language model for this task, that can ingest the proposals from the character bank, whilst conditioning on the visual features using cross-attention, and demonstrate how this improves over previous architectures for AD text generation in an apples-to-apples comparison.

  • [hal-04323514] AutoAD: Movie Description in Context

    The objective of this paper is an automatic Audio Description (AD) model that ingests movies and outputs AD in text form. Generating high-quality movie AD is challenging due to the dependency of the descriptions on context, and the limited amount of training data available. In this work, we leverage the power of pretrained foundation models, such as GPT and CLIP, and only train a mapping network that bridges the two models for visually-conditioned text generation. In order to obtain high-quality AD, we make the following four contributions: (i) we incorporate context from the movie clip, AD from previous clips, as well as the subtitles; (ii) we address the lack of training data by pretraining on large-scale datasets, where visual or contextual information is unavailable, e.g. text-only AD without movies or visual captioning datasets without context; (iii) we improve on the currently available AD datasets, by removing label noise in the MAD dataset, and adding character naming information; and (iv) we obtain strong results on the movie AD task compared with previous methods.

  • [hal-04323501] Adaptive Shivers Sort: An Alternative Sorting Algorithm

    [...]

  • [hal-04323443] Finding automatic sequences with few correlations

    Abstract Although automatic sequences are very simple algorithmically, some of them have pseudo-random properties. In particular, some automatic sequences such as the Golay–Shapiro sequence are known to be 2-uncorrelated, meaning that they have the same correlations of order 2 as a uniform random sequence. However, the existence of ℓ -uncorrelated automatic sequences (for ℓ ⩾ 3) was left as an open question in a recent paper of Marcovici, Stoll and Tahay. We exhibit binary block-additive sequences that are 3-uncorrelated and, with the help of analytical results supplemented by an exhaustive search, we present a complete picture of the correlation properties of binary block-additive sequences of rank r ⩽ 5, and ternary sequences of rank r ⩽ 3.

  • [hal-04323418] Reduction Ratio of the IS-Algorithm: Worst and Random Cases

    We study the IS-algorithm, a well-known linear-time algorithm for computing the suffix array of a word. This algorithm relies on transforming the input word w into another word, called the reduced word of w, that will be at least twice shorter; then, the algorithm recursively computes the suffix array of the reduced word. In this article, we study the reduction ratio of the IS-algorithm, i.e., the ratio between the lengths of the input word and the word obtained after reducing k times the input word. We investigate both worst cases, in which we find precise results, and random cases, where we prove some strong convergence phenomena. Finally, we prove that, if the input word is a randomly chosen word of length n, we should not expect much more than log(log(n)) recursive function calls.

  • [hal-04323404] Galloping in Fast-Growth Natural Merge Sorts

    [...]

  • [hal-04323382] Work In Progress: A New Task Model for Real-Time DNNs over GPU

    Recently, deep neural networks (DNNs) have been utilized in real-time systems such as autonomous vehicles, where meeting temporal constraints is essential. However, executing such systems on CPU-GPU architectures can make scheduling analysis challenging due to the added delays caused by computing and memory contention. In addition, classic task models are not directly able to model accurately such systems. In this article, we propose a new task model called DNN Task Model (DTM). This model considers both DNN properties and GPU architecture at the same time. It allows us to distinguish between CPU and GPU tasks, provides information about the DNN application and give more accurate execution time analysis through consideration of data quality. We compute DTM from a source CUDA file and a set of real-time specifications of the system. The proposed model is extensible enough to be adopted to various DNN type applications allowing designer to compare candidate software and GPU architectures. Furthermore, we propose a graph optimization inspired by Tensor-RT.

  • [hal-04323285] Automatic Threshold RanSaC Algorithms for Pose Estimation Tasks

    When faced with data corrupted by both noise and outliers robust estimation algorithms like RanSaC are used, especially in the field of Multi-View Stereo (MVS) or Structure-from-Motion (SfM). To find the best model fitting the data, from numerous minimal samples it evaluates models and rates them according to their number of inliers. The classification as inlier depends on a user-set threshold that should be tailored to the noise level of the data. This requires the knowledge of this level, which is rarely available. The few existing adaptive threshold algorithms solve this problem by estimating the value of the threshold while computing the best model. However, it is hard to obtain groundtruth for MVS and SfM tasks and usually test datasets are based on the output on some state of the art algorithm, which prevents the objective evaluation of new algorithms. We propose a new method to generate artificial datasets based on true data to get realistic and measurable results. We use this method to benchmark different automatic RanSaC algorithms and find out how they compare to each other and identify each algorithm's strengths and weaknesses. This study reveals uses cases for each method and the possible tradeoffs between performance and execution time.

  • [hal-04317473] Design of a Robust Radio-Frequency Fingerprint Identification Scheme for Multimode LFM Radar

    Radar is an indispensable part of the Internet of Things (IoT). Specific emitter identification is essential to identify the legitimate radars and, more importantly, to reject the malicious radars. Conventional methods rely on pulse parameters that are not capable to identify the specific emitter as two radars may have the same configuration or a malicious radar can perform spoofing attacks. Radio frequency fingerprint (RFF) is the unique and intrinsic hardware characteristic of devices resulted from hardware imperfection, which can be used as the device identity. This paper proposes a robust and reliable radar identification scheme based on the RFF, taking linear frequency modulation (LFM) radar as a case study. This scheme first classifies the operation mode of the pulses, then eliminates the noise effect, and finally identifies the radar emitters based on the transient and modulation-based RFF features. Experimental results verify the effectiveness of our radar identification scheme among three real LFM radars (same model) operating at four modes, each mode with 2,000 pulses from each radar. The identification rates of the four modes are all higher than 90% when the signal-tonoise ratio (SNR) is about 5 dB. In addition, mode 3 achieves almost 100% identification accuracy even when the SNR is as low as-10 dB.

  • [hal-04317297] How does the dedicated software PLEIA provide computer access assessment for people with physical disabilities?

    Computer tools allow to ease the daily life of everyone, especially for people with disabilities. The optimal choice of pointing interfaces or types of settings can be difficult to achieve. Although there exist a few tests to compare and evaluate the performance of computer access technology (CAT), most of them only provide results as qualitative terms. Besides, the current choice is based mainly on clinical observations or non-standardized tests. To objectify the recommendations in CAT, support funding for people with disabilities and measure the functional repercussions of a therapeutic action, it is necessary to carry out comparative tests with measurable criteria. This paper presents the development of a personalized, free, and dedicated evaluation platform of pointing interfaces and aids. The quantitative evaluation process is described in detail, including the configuration of different exercises with settable parameters that permits to build a customized evaluation process with increased difficulties, the definition of performance indicators and the statistical analysis methods for quantified comparative tests. Finally, we present the assessment results of four people with different disabilities using multiple pointing interfaces, which verify the effectivity of this evaluation platform with the help of occupational therapists.

  • [hal-04322365] Unifying GANs and Score-Based Diffusion as Generative Particle Models

    Particle-based deep generative models, such as gradient flows and score-based diffusion models, have recently gained traction thanks to their striking performance. Their principle of displacing particle distributions using differential equations is conventionally seen as opposed to the previously widespread generative adversarial networks (GANs), which involve training a pushforward generator network. In this paper we challenge this interpretation, and propose a novel framework that unifies particle and adversarial generative models by framing generator training as a generalization of particle models. This suggests that a generator is an optional addition to any such generative model. Consequently, integrating a generator into a score-based diffusion model and training a GAN without a generator naturally emerge from our framework. We empirically test the viability of these original models as proofs of concepts of potential applications of our framework.

  • [hal-04322321] Estimation consistante de la dimension minimale des représentations d'état de séries temporelles multivariables de grandes dimensions

    Cet article est consacré à l'estimation de la dimension minimale P des représentations d'état d'une série temporelle multivariable (yn) n∈Z de dimension M définie comme une version bruitée (le bruit est gaussien et blanc temporellement) d'un signal utile (un) n∈Z dont la densité spectrale est rationnelle et de petit rang. Cette étude est menée dans le régime des grandes dimensions dans lequel le nombre d'échantillons disponibles N et la dimension des observations M sont grands et du même ordre de grandeur. En utilisant des techniques de grandes matrices aléatoires, il est établi que l'analyse des plus grands coefficients de corrélation canonique estimés entre le passé et le futur de y permet d'évaluer de faccon consistante P si des conditions liées au rapport signal sur bruit et aux coefficients de corrélation canonique entre le passé et le futur du signal u sont vérifiées

  • [hal-04322313] Un test d'indépendance mutuelle entre un grand nombre de signaux

    Dans cet article, nous proposons un nouveau test permettant de vérifier l'indépendance mutuelle d'un grand nombre de signaux dans le cas où le nombre d'observations disponible est limité. Le test utilise des statistiques linéaires des valeurs propres de la matrice de cohérence spectrale estimée, évaluées sur une grille de fréquence bien choisie. Nous montrons que sous l'hypothèse d'indépendance, la statistique de test bien recentrée et normalisée converge en loi vers une gaussienne standard. Cela permet d'évaluer l'erreur de première espèce asymptotique du test.

  • [hal-04322300] On the asymptotic distribution of the maximum sample spectral coherence of Gaussian time series in the high dimensional regime

    We investigate the asymptotic distribution of the maximum of a frequency smoothed estimate of the spectral coherence of a M-variate complex Gaussian time series with mutually independent components when the dimension M and the number of samples N both converge to infinity. If B denotes the smoothing span of the underlying smoothed periodogram estimator, a type I extreme value limiting distribution is obtained under the rate assumptions M N → 0 and M B → c ∈ (0, +∞). This result is then exploited to build a statistic with controlled asymptotic level for testing independence between the M components of the observed time series. Numerical simulations support our results.

  • [hal-04069187] Interactive Segmentation With Incremental Watershed Cuts

    In this article, we propose an incremental method for computing seeded watershed cuts for interactive image segmentation. We propose an algorithm based on the hierarchical image representation called the binary partition tree to compute a seeded watershed cut. We show that this algorithm fits perfectly in an interactive segmentation process by handling user interactions, seed addition or removal, in time linear with respect to the number of affected pixels. Run time comparisons with several state-of-the-art interactive and noninteractive watershed methods show that the proposed method can handle user interactions much faster than previous methods, thus improving the user experience on large images.

  • [hal-04317498] Vibration-based Terrain Classification Recognition Using a Six-axis Accelerometer

    Aging is a key problem in our daily life which demands more technology such as the terrain classification recognition for the detailed path planning. In this article, a six-axis accelerometer was placed on the base of a walking stick to capture walking gait vibration information. The signal features in the collected information were used to reflect the terrain. We used a matching tracking method to decompose the signal data into linear combinations of Gabor atoms and a joint time-frequency analysis method to perform analysis on the topographic features in a three-dimensional space. Three types of terrains were classified from space-time data. Results show that the proposed algorithm could achieve an average accuracy rate of 88.6%, which is 4% higher than conventional methods.

  • [hal-04317291] Editing and Analysing Historical Astronomical Diagrams with Artificial Intelligence

    The EIDA project explores the historical use of astronomical diagrams across Asia, Africa, and Europe. We aim to develop automatic image analysis tools to analyze and edit these diagrams without human annotation, gaining a refined understanding of their role in shaping and transmitting astronomy. In this paper, we present a baseline method to detects lines and circles in historical diagrams, based on text removal, edge detection and RANSAC. We compare this strong baseline to a deep learning approach based on LETR. This work contributes to historical diagram vectorization, enabling novel methods of comparison and clustering, and offering fresh insights into the vast corpus of astronomical diagrams.

  • [hal-04317284] Class Uncertainty: A Measure to Mitigate Class Imbalance

    Class-wise characteristics of training examples affect the performance of deep classifiers. A well-studied example is when the number of training examples of classes follows a long-tailed distribution, a situation that is likely to yield suboptimal performance for under-represented classes. This class imbalance problem is conventionally addressed by approaches relying on the class-wise cardinality of training examples, such as data resampling. In this paper, we demonstrate that considering solely the cardinality of classes does not cover all issues causing class imbalance. To measure class imbalance, we propose CLASS UNCERTAINTY as the average predictive uncertainty of the training examples, and we show that this novel measure captures the differences across classes better than cardinality. We also curate SVCI-20 as a novel dataset in which the classes have equal number of training examples but they differ in terms of their hardness; thereby causing a type of class imbalance which cannot be addressed by the approaches relying on cardinality. We incorporate our CLASS UNCERTAINTY measure into a diverse set of ten class imbalance mitigation methods to demonstrate its effectiveness on long-tailed datasets as well as on our SVCI-20. Code and datasets will be made available.

  • [hal-03765422] TokenCut: Segmenting Objects in Images and Videos with Self-supervised Transformer and Normalized Cut

    In this paper, we describe a graph-based algorithm that uses the features obtained by a self-supervised transformer to detect and segment salient objects in images and videos. With this approach, the image patches that compose an image or video are organised into a fully connected graph, where the edge between each pair of patches is labeled with a similarity score between patches using features learned by the transformer. Detection and segmentation of salient objects is then formulated as a graph-cut problem and solved using the classical Normalized Cut algorithm. Despite the simplicity of this approach, it achieves state-of-the-art results on several common image and video detection and segmentation tasks. For unsupervised object discovery, this approach outperforms the competing approaches by a margin of 6.1%, 5.7%, and 2.6%, respectively, when tested with the VOC07, VOC12, and COCO20K datasets. For the unsupervised saliency detection task in images, this method improves the score for Intersection over Union (IoU) by 4.4%, 5.6% and 5.2%. When tested with the ECSSD, DUTS, and DUT-OMRON datasets, respectively, compared to current state-of-the-art techniques. This method also achieves competitive results for unsupervised video object segmentation tasks with the DAVIS, SegTV2, and FBMS datasets.

  • [hal-04316644] Computer Vision and Historical Scientific Illustrations

    The VHS project (computer Vision and Historical analysis of Scientific illustration circulation) proposes a new approach to the historical study of the circulation of scientific knowledge based on new methods of illustration analysis. Our contributions in this paper are twofold. First, we present a semi-automatic interactive pipeline for scientific illustration extraction that allows and incorporates expert feedback from historians. Second, we introduce a new dataset of scientific illustrations from the Middle Ages to the modern era consisting of 8k illustrations validated by historians and a total number of 235k illustrations obtained from 405k corpora pages. We further discuss our current research for identifying a series of related illustrations from this data.

  • [hal-04316115] Synchronizing Random Almost-Group Automata

    [...]

  • [hal-04316084] Back-To-Front Online Lyndon Forest Construction

    [...]

  • [hal-04316043] A Probabilistic Model Revealing Shortcomings in Lua's Hybrid Tables

    [...]

  • [hal-04316025] One Drop of Non-Determinism in a Random Deterministic Automaton

    [...]

  • [hal-04315981] The Cerny Conjecture Holds with High Probability

    An automaton is synchronizing when there is a word that brings every state into one and the same state. Such a word is called a synchronizing word, and Černý conjectured in 1964 that if a n-state deterministic automaton is synchronizing, then it has a synchronizing word of length at most (n − 1)². The best bound known so far is cubic in n and was obtained by Szykuła in 2017. In this article, we study the synchronization properties of random deterministic automata, for the uniform distribution. Berlinkov recently proved that they are synchronizing with high probability. Our contribution is to study the typical length of the smallest synchronizing word, when such a word exists: we establish that with high probability, such an automaton with n states admits a synchronizing word of length O(n log^3 n). As a byproduct, we get that for most automata, the Černý conjecture holds.

  • [hal-04315975] Simplifications of Uniform Expressions Specified by Systems

    [...]

  • [hal-04315964] Random Regular Expression Over Huge Alphabets

    [...]

  • [hal-04315790] Improving neural implicit surfaces geometry with patch warping

    Neural implicit surfaces have become an important technique for multi-view 3D reconstruction but their accuracy remains limited. In this paper, we argue that this comes from the difficulty to learn and render high frequency textures with neural networks. We thus propose to add to the standard neural rendering optimization a direct photo-consistency term across the different views. Intuitively, we optimize the implicit geometry so that it warps views on each other in a consistent way. We demonstrate that two elements are key to the success of such an approach: (i) warping entire patches, using the predicted occupancy and normals of the 3D points along each ray, and measuring their similarity with a robust structural similarity (SSIM); (ii) handling visibility and occlusion in such a way that incorrect warps are not given too much importance while encouraging a reconstruction as complete as possible. We evaluate our approach, dubbed NeuralWarp, on the standard DTU and EPFL benchmarks and show it outperforms state of the art unsupervised implicit surfaces reconstructions by over 20% on both datasets. Our code is available at https://github.com/fdarmon/NeuralWarp

  • [hal-04315771] Deep Multi-View Stereo Gone Wild

    Deep multi-view stereo (MVS) methods have been developed and extensively compared on simple datasets, where they now outperform classical approaches. In this paper, we ask whether the conclusions reached in controlled scenarios are still valid when working with Internet photo collections. We propose a methodology for evaluation and explore the influence of three aspects of deep MVS methods: network architecture, training data, and supervision. We make several key observations, which we extensively validate quantitatively and qualitatively, both for depth prediction and complete 3D reconstructions. First, complex unsupervised approaches cannot train on data in the wild. Our new approach makes it possible with three key elements: upsampling the output, softmin based aggregation and a single reconstruction loss. Second, supervised deep depthmap-based MVS methods are state-of-the art for reconstruction of few internet images. Finally, our evaluation provides very different results than usual ones. This shows that evaluation in uncontrolled scenarios is important for new architectures.

  • [hal-04315572] Learning to Guide Local Feature Matches

    We tackle the problem of finding accurate and robust keypoint correspondences between images. We propose a learning-based approach to guide local feature matches via a learned approximate image matching. Our approach can boost the results of SIFT to a level similar to state-of-theart deep descriptors, such as Superpoint, ContextDesc, or D2-Net and can improve performance for these descriptors. We introduce and study different levels of supervision to learn coarse correspondences. In particular, we show that weak supervision from epipolar geometry leads to performances higher than the stronger but more biased point level supervision and is a clear improvement over weak image level supervision. We demonstrate the benefits of our approach in a variety of conditions by evaluating our guided keypoint correspondences for localization of internet images on the YFCC100M dataset and indoor images on the SUN3D dataset, for robust localization on the Aachen daynight benchmark and for 3D reconstruction in challenging conditions using the LTLL historical image data.

  • [hal-04314702] Pose from Shape: Deep Pose Estimation for Arbitrary 3D Objects

    Most deep pose estimation methods need to be trained for specific object instances or categories. In this work we propose a completely generic deep pose estimation approach, which does not require the network to have been trained on relevant categories, nor objects in a category to have a canonical pose. We believe this is a crucial step to design robotic systems that can interact with new objects in the wild not belonging to a predefined category. Our main insight is to dynamically condition pose estimation with a representation of the 3D shape of the target object. More precisely, we train a Convolutional Neural Network that takes as input both a test image and a 3D model, and outputs the relative 3D pose of the object in the input image with respect to the 3D model. We demonstrate that our method boosts performances for supervised category pose estimation on standard benchmarks, namely Pascal3D+, ObjectNet3D and Pix3D, on which we provide results superior to the state of the art. More importantly, we show that our network trained on everyday man-made objects from ShapeNet generalizes without any additional training to completely new types of 3D objects by providing results on the LINEMOD dataset as well as on natural entities such as animals from ImageNet.

  • [hal-03329724] Dire le haut degré sans le dire en japonais et en français : exclamatives en "à quel point" et en "donnani

    Le japonais et le français partagent un mécanisme pour exprimer subjectivement le haut degré d’une propriété. Il prend la forme de constructions syntaxiques particulières, ayant leurs propres forme et sens, avec une valeur pragmatique bien délimitée. En japonais, donnani forme une construction indépendante et une construction dépendante, en corrélation avec la fin de phrase kotoka. En français, à quel point se construit presque exclusivement en subordonnée, dépendant de prédicats qui excluent l’interprétation de questionnement. Malgré leur forme interrogative, ils ne sont pas employés pour poser une question dans un dialogue mais pour former l’argument de la prédication d’indicibilité ou d’incompréhension, le tout constituant une exclamation.

  • [hal-04313625] C'est pour moi que tu dis ça ?" Entendre une voix en sourdine et contester

    Le marqueur "C'est pour moi que tu dis ça ?" (CPM) est un signe d'inférence contextuelle qui dénonce et conteste une allusion négative à l'encontre du locuteur du marqueur (L 2), qu'il croit entendre comme une voix masquée sous un énoncé d'un autre locuteur (L 1). L'implicite, volontaire ou involontaire et insaisissable linguistiquement, se dévoile par l'énonciation même de CPM, qui assigne à L 2 , allocutaire ou non de L 1 , le rôle de destinataire de l'implicite. CPM est dialogal : il présuppose l'énonciation préalable de L 1 et l'énoncé de L 1 présente la caractéristique fondamentale d'être interprété comme une allusion par une figure rhétorique d'association. L 2 ne se contente pas de dévoiler une allusion mais la conteste simultanément : CPM est un argument co-orienté avec un énoncé assertant le contraire de ce qui est inféré. L 1 est invité à nier l'intention allusive.

  • [hal-03830513] The Problem of Discovery in Version Control Systems

    Version Control Systems, used by developers to keep track of the evolution of their code, model repositories as Merkle graphs of revisions. In order to synchronize efficiently between different instances of a repository, they need to determine the common knowledge that they share. This process is called discovery. In this paper, we provide theoretical definitions for the problem of discovery and establish some universal upper and lower bounds on its communication complexity. We also present and analyze some algorithms that are used in extant VCSs, such as Mercurial and Git.

  • [hal-04279028] Approche basée sur l'apprentissage automatique pour la détection d'anomalies lors de la surveillance d'ouvrages

    L'un des principaux objectifs de la surveillance de santé structurale (SHM) est de détecter, et éventuellement localiser, quantifier ou prédire les dommages sur les structures. Sans connaissances détaillées du comportement mécanique structurel, l'analyse des données est une tâche complexe, et la surveillance opérationnelle est souvent limitée à l'utilisation de seuils plus ou moins arbitraires. Les approches data-driven qui reposent sur une analyse statistique des données, ont suscité un intérêt croissant ces deux dernières décennies. Cet article propose une approche basée sur plusieurs modèles automatisés construits par apprentissage automatique, pour la détection et la localisation des anomalies dans les données de surveillance d'un grand pont en béton. Pour chaque capteur, plusieurs modèles de régression sont générés à l’aide de réseaux de neurones récurrents en utilisant les données d'autres capteurs déployés sur la structure. Les anomalies sont ensuite identifiées dans le jeu de données en fonction des résidus entre les sorties des modèles et les données mesurées in situ. Pour un capteur donné, les résidus de tous les modèles sont ensuite compilés pour produire un indicateur d'anomalie.

  • [hal-04306324] GPU for Monte Carlo Search

    Monte Carlo Search algorithms can give excellent results for some combinatorial optimization problems and for some games. They can be parallelized efficiently on high-end CPU servers. Nested Monte Carlo Search is an algorithm that parallelizes well. We take advantage of this property to obtain large speedups running it on low cost GPUs. The combinatorial optimization problem we use for the experiments is the Snake-in-the-Box. It is a graph theory problem for which Nested Monte Carlo Search previously improved lower bounds. It has applications in electrical engineering, coding theory, and computer network topologies. Using a low cost GPU, we obtain speedups as high as 420 compared to a single CPU.


Articles principaux

On the Performance of Sliding Window TD-LMMSE Channel Estimation for 5G Waveforms in High Mobility Scenario

SAIDEH, Michel ; BERBINEAU, Marion ; DAYOUB, Iyad   /   (2018)

IEEE Transactions on Vehicular Technology, 5p, doi: 10.1109/TVT.2018.2845551

https://dx.doi.org/10.1109/TVT.2018.2845551
https://ieeexplore.ieee.org/document/8375806/

Télécharger le document

On Doubly selective Channel Estimation for FBMC-OQAM using the LMMSE Filter for Future Railway Communications

SAIDEH, Michel ; BERBINEAU, Marion ; DAYOUB, Iyad   /   (2018)

ITST 2018, 16th International Conference on Intelligent Transport Systems Telecommunications, PORTUGAL, 6p

Plus d'infos

Cyber-Physical Security Risk Assessment for Train Control and Monitoring Systems

REKIK, mouna ; GRANSART, Christophe ; BERBINEAU, Marion   /   (2018)

SSV 2018, 1st International Workshop on System Security and Vulnerability, IEEE CNS Conference on Communications and Network Security, CHINE, 9p

Télécharger le document

Cyber-physical Threats and Vulnerabilities Analysis for Train Control and Monitoring Systems

REKIK, Mouna ; GRANSART, Christophe ; BERBINEAU, Marion   /   (2018)

IEEE ISNCC 2018, International Symposium on Networks, Computers and Communications, ITALIE, 6p

https://ieeexplore.ieee.org/document/8531005

Télécharger le document

A new clustering structure for VANET

RIVOIRARD, Lucas ; WAHL, Martine ; SONDI, Patrick ; BERBINEAU, Marion ; GRUYER, Dominique   /   (2018)

TRA 2018, 7th Transport Research Arena, AUTRICHE, 10p

https://zenodo.org/record/1485695#.XG7Ba7jZCbg
https://dx.doi.org/10.5281/zenodo.1485695

Plus d'infos

A Cooperative Vehicle Ego-localization Application Using V2V Communications with CBL Clustering

RIVOIRARD, Lucas ; WAHL, Martine ; SONDI, Patrick ; GRUYER, Dominique ; BERBINEAU, Marion   /   (2018)

IEEE IV 2018, 29th IEEE Intelligent Vehicles Symposium, CHINE, pp.722-727

https://ieeexplore.ieee.org/document/8500688
https://dx.doi.org/10.1109/IVS.2018.8500688

Plus d'infos

Extended Kalman Filter (EKF) Innovation-based Integrity Monitoring Scheme with C/N0 Weighting

ZHU, Ni ; BETAILLE, David ; MARAIS, Juliette ; BERBINEAU, Marion   /   (2018)

IEEE RTSI 2018, 4th International Forum on Research and Technologies for Society and Industry, ITALIE, 6p

Plus d'infos

Evaluating TCMS Train-to-Ground communication performances based on the LTE technology and discreet event simulations

BOUAZIZ, Maha ; YAN, Ying ; KASSAB, Mohamed ; SOLER, José ; BERBINEAU, Marion   /   (2018)

13th International Workshop on Communication Technologies for Vehicles: Nets4Cars - Nets4Trains - Nets4Aircraft - Nets4Spacecrafts, ESPAGNE, 12p

Plus d'infos

Train-to-Ground communications of Train Control and Monitoring Systems: A simulation platform modelling approach

BOUAZIZ, Maha ; YAN, Ying ; KASSAB, Mohamed ; SOLER, José ; BERBINEAU, Marion   /   (2018)

TRA 2018, 7th Transport Research Arena, AUTRICHE, 10p

Plus d'infos

Proposition d'une structuration dynamique d'un réseau de communication intervéhiculaire pour les ITS

RIVOIRARD, Lucas ; WAHL, Martine ; SONDI, Patrick ; BERBINEAU, Marion ; GRUYER, Dominique   /   (2018)

RDMI 2018, Les rencontres de la mobilité intelligente, ATEC ITS FRANCE, FRANCE, 11p

http://www.congres-atecitsfrance.fr/actualites/programme-2018-telecharger-les-pre-actes

Télécharger le document

Graph-based people segmentation using a genetically optimized combination of classifiers

MEURIE, Cyril ; LEZORAY, Olivier ; CONIGLIO, Christophe ; BERBINEAU, Marion   /   (2018)

Journal of Electronic Imaging, 27p

Télécharger le document

GNSS Integrity Enhancement for Urban Transport Applications by Error Characterization and Fault Detection and Exclusion (FDE)

ZHU, Ni ; BETAILLE, David ; MARAIS, Juliette ; BERBINEAU, Marion   /   (2018)

Géolocalisation et Navigation dans l'Espace et le Temps, Journées Scientifiques 2018 de l'URSI, FRANCE, 11p

https://ursi-france.sciencesconf.org/187025/document

Télécharger le document

Safety Appraisal of GNSS-Based Localization Systems Used in Train Spacing Control

BEUGIN, Julie ; LEGRAND, Cyril ; MARAIS, Juliette ; BERBINEAU, Marion ; EL KOURSI, El Miloudi   /   (2018)

IEEE Access, 6, 99, pp9898-9916, doi: 10.1109/ACCESS.2018.2807127

http://ieeexplore.ieee.org/document/8293773/
http://dx.doi.org/10.1109/ACCESS.2018.2807127

Télécharger le document

GNSS Position Integrity in Urban Environments: A Review of Literature

ZHU, Ni ; MARAIS, Juliette ; BETAILLE, David ; BERBINEAU, Marion   /   (2018)

IEEE Transactions on Intelligent Transportation Systems, 19, 9, pp2762-2778, doi: 10.1109/TITS.2017.2766768

https://doi.org/10.1109/TITS.2017.2766768
https://ieeexplore.ieee.org/document/8248655/

Télécharger le document

Performance Evaluation of Multi-Carrier Modulation Techniques in High Speed Railway Environment with Impulsive Noise

SAIDEH, Michel ; ALSABA, Yamen ; DAYOUB, Iyad ; BERBINEAU, Marion   /   (2019)

5GWF 2019, IEEE 2nd 5G World Forum, ALLEMAGNE, pp243-248

https://doi.org/10.1109/5GWF.2019.8911645

Plus d'infos

A Round Earth Loss Model and Small-Scale Channel Properties for Open-Sea Radio Propagation

YANG, Kun ; F. MOLISCH, Andreas ; EKMAN, Torbjörn ; ROSTE, Terje ; BERBINEAU, Marion   /   (2019)

IEEE Transactions on Vehicular Technology, 68, 9, pp 8449-8460, doi: 10.1109/TVT.2019.2929914

https://doi.org/10.1109/TVT.2019.2929914

Plus d'infos

Joint Interference Cancellation for Multi-Carrier Modulation-Based Non-Orthogonal Multiple Access

SAIDEH, Michel ; ALSABA, Yamen ; DAYOUB, Iyad ; BERBINEAU, Marion   /   (2019)

IEEE Communications Letters, 23, 11, pp2114-2117, doi: 10.1109/LCOMM.2019.2933817

http://dx.doi.org/10.1109/LCOMM.2019.2933817
https://hal.archives-ouvertes.fr/hal-03133339

Plus d'infos

Efficient Equalization for FBMC-OQAM Under Doubly Selective Channel Estimation Errors

SAIDEH, Michel ; DAYOUB, Iyad ; BERBINEAU, Marion   /   (2019)

IEEE Communications Letters, 23, 5, pp863-866, doi: 10.1109/LCOMM.2019.2907938

http://dx.doi.org/10.1109/LCOMM.2019.2907938
https://hal.archives-ouvertes.fr/hal-03142226

Plus d'infos

Hardware-in-the-loop and Software-in-the-loop platform for test and validation of adaptable radio communications systems for railways at IP layer

MORENO, Juan ; BOUAZIZ, Maha ; BERBINEAU, Marion ; YAN, Ying ; SOLER, José ; TORREGO, Raul ; INAKI, Val ; VIZZARRI, Alessandro ; CLAVIER, Laurent ; KASSI, Rédha ; COCHERIL, Yann ; DENIAU, Virginie ; GRANSART, Christophe   /   (2019)

Net4Rails, FRANCE, 9p

https://orbit.dtu.dk/en/publications/hardware-in-the-loop-and-software-in-the-loop-platform-for-test-a

Télécharger le document

The SmartRaCon Concept for advanced train control systems

MEYER ZU HÖRSTE, Michael ; HAINZ, Svenja ; BERBINEAU, Marion ; MARAIS, Juliette ; MASSON, Emilie ; MENDIZABAL, Jaizki ; HUTCHINSON, Michael   /   (2019)

WCRR 2019, 12th World Congress on Railway Research, Railway Research to Enhance the Customer Experience, JAPON, 6p

Plus d'infos

Extraction de silhouettes à partir de boîtes englobantes de détection

MEURIE, Cyril ; LEZORAY, Olivier ; BERBINEAU, Marion   /   (2019)

GRETSI 2019, 27ème Colloque francophone de traitement du signal et des images, FRANCE, 4p

Plus d'infos

Safe satellite-based localization of the train thanks to a combination of accuracy enhancement and fault detection and exclusion schemes

MARAIS, Juliette ; ZHU, Ni ; BERBINEAU, Marion ; BETAILLE, David   /   (2019)

WCRR 2019, 12th World Congress on Railway Research, JAPON, 6p

Plus d'infos

Application of fuzzy theory for identifying the required availability of an autonomous localization unit in European Train Control System

NGUYEN, Khanh ; BEUGIN, Julie ; BERBINEAU, Marion ; MARAIS, Juliette   /   (2019)

Journal of Intelligent Transportation Systems, 18p, doi: 10.1080/15472450.2018.1525533

https://doi.org/10.1080/15472450.2018.1525533
https://www.tandfonline.com/doi/full/10.1080/15472450.2018.1525533

Télécharger le document

On the Sum Rate of MCM-Based NOMA and MCM-Based OMA Systems

ALSABA, Yamen ; SAIDEH, Michel ; DAYOUB, Iyad ; BERBINEAU, Marion   /   (2020)

ICSPCS 2020, 14th International Conference on Signal Processing and Communication Systems, AUSTRALIE, 5p

https://doi.org/10.1109/ICSPCS50536.2020.9310001

Plus d'infos

Emulation of various radio access technologies for zero on site testing in the railway domain - the Emulradio4rail platforms

BERBINEAU, Marion ; MORENO, Juan ; KHARBECH, Sofiane ; YANG, Ying ; VIZZARI, Alessandro ; TORREGO, Raul ; SOLER, José ; CLAVIER, Laurent ; KASSI, Rédha ; MAZZENGA, Franco ; GIULIANO, Romeo ; INAKI, Val ; GRANSART, Christophe ; DENIAU, Virginie ; COCHERIL, Yann ; SVENSSON, Kristina ; CARILLO, Armano   /   (2020)

TRA 2020, 8th Transport Research Arena, FINLANDE, 10p

https://hal.archives-ouvertes.fr/hal-03343233

Télécharger le document

Emulation of end-to-end communications systems in railway scenarios: physical layer results

MORENO GARCIA-LOYGORRI, Juan ; KHARBECH, Sofiane ; CLAVIER, Laurent ; KASSI, Redha ; TORREGO, Raul ; ARRIOLA, Aitor ; VAL, Inaki ; BERBINEAU, Marion ; SOLER, José ; YAN, Ying   /   (2020)

EuCAP 2020, 14th European Conference on Antennas and Propagation, DANEMARK, 5p

http://dx.doi.org/10.23919/EuCAP48036.2020.9135760
https://hal.archives-ouvertes.fr/hal-03270096
https://hal.archives-ouvertes.fr/hal-03270096/file/EuCAP2020_YingYan.pdf

Télécharger le document

GNSS Integrity Monitoring Schemes for Terrestrial Applications in Harsh Signal Environments

ZHU, Ni ; BETAILLE, David ; MARAIS, Juliette ; BERBINEAU, Marion   /   (2020)

IEEE Intelligent Transportation Systems Magazine , 11p, doi: 10.1109/MITS.2020.2994076

https://ieeexplore.ieee.org/document/9113715

Plus d'infos