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  • Other research product . Other ORP type . 2010
    Open Access English
    Authors: 
    Chabot, Armelle;
    Publisher: HAL CCSD
    Country: France

    Invited presentation - Visiting University of Reno, USA

  • Other research product . Other ORP type . 2020
    Open Access English
    Authors: 
    ZEGHNI, Sylvain;
    Publisher: HAL CCSD
    Country: France

    Il y a quelques jours, Stephen Roach, économiste renommé, a publié un remarquable article d'opinion dans le "Financial Times". Il a esquissé un avenir de stagflation (faible croissance et de forte inflation) en raison de la fragilité croissante des chaînes et de la baisse de la demande des consommateurs que le confinement a imposée.Selon nous, Stephen Roach a fondamentalement tort. En substance, cet argument réitère la crainte de nombreux nouveaux économistes classiques qui s'inspirent de l'affirmation de Milton Friedman selon laquelle l'inflation est toujours un phénomène monétaire.

  • Open Access English
    Authors: 
    RODRIGUEZ, J;
    Publisher: HAL CCSD
    Country: France

    C06-32 - PROJET RECIFE Convention N° 02 31 0045; Rapport de recherche; Scheduling is the process of allocating resources to activities over time. In a scheduling problem, resources are scarce and constrained in various ways (e.g. in the order of activities and the capacity of resources), and one is looking for a schedule of the activities that both satisfies the constraints and is optimal according to some criteria. This paper deals with an extension of a constraint-based scheduling model of real time management of train traffic through junctions and large stations. This extension allows the improvement of the model of conflicts between trains running in opposite directions with the use of state resources. To tackle large instances, a temporal decomposition has been used. We tested the model and algorithms by applying to problem instances of a real terminal station. Computational results show that with the temporal decomposition method we are able to obtain good solution in short computation time

  • Other research product . Other ORP type . 2005
    Open Access English
    Authors: 
    MARKEWITZ, K; JOUMARD, R;
    Publisher: HAL CCSD
    Country: France

    N° contrat, conv. 1999-RD.10429; Rapport de recherche; L'objectif du travail présenté dans ce document est de définir un modèle d'émission pour les polluants à l'échappement (CO, CO2, HC, NOx et particules) et de consommation de carburant des petits véhicules utilitaires. Un recueil des données a été effectué au sein de différents laboratoires européens et les émissions gazeuses de 150 véhicules testés selon différentes conditions de conduites et de charge ont été recueillies. Le classement des véhicules a été effectué selon le carburant, la norme européenne d'émissions (pre-Euro-1 à Euro-2) et la classification européenne (N1-I, N1-II et N1-III). 24 groupes ont ainsi été distingués. Pour chaque groupe et chacun des polluants réglementaires, un facteur d'émission présenté sous la forme d'une fonction continue du second degré a été établi en fonction de la vitesse moyenne et de la charge et a été statistiquement validé par le test de Pearson

  • Other research product . Other ORP type . 2009
    Open Access English
    Authors: 
    SELLOUM, Ahmed; BETAILLE, David; LE CARPENTIER, Eric; PEYRET, François;
    Country: France

    GPS positioning and map-matching are key technologies used in Car Navigation Systems. Next generation of Cooperative Vehicle Infrastructure Systems (CVIS) will surely require positioning component with higher accuracy, integrity and availability, for instance for the needs of lanelevel applications. The concept of Map Aided Location (MAL) was introduced recently: it consists in considering the map contents (geometry and topology) as constraints in the positioning problem. The main contribution of the work reported in this article concerns the evolution model of the vehicle : whereas previous research investigations were based on usual models in plane coordinates, we propose here an evolution model adapted to the local curvature of the road. Therefore, road constraints are emphasized, particularly when GPS outages occur. An enhanced map (Emap) - where all lanes are represented with decimeter accuracy - is used in this Map Aided Location process.

  • Open Access English
    Authors: 
    BROSSEAUD, Yves;
    Publisher: HAL CCSD
    Country: France

    Présentation des missions et activités du LCPC.

  • Open Access English
    Authors: 
    Soldovieri, Francesco; Masini, Nicola; Alvarez de Buergo, Monica; Dumoulin, Jean;
    Publisher: Society of Exploration Geophysicists
    Country: France

    International audience

  • Open Access English
    Authors: 
    AMDITIS, Angelos; BIMPAS, Matthaios; THOMAIDIS, George; TSOGAS, Manolis; NETTO, Mariana; MAMMAR, Said; BEUTNER, Achim; MOHLER, Nikolaus; WIRTHGEN, Tom; ZIPSER, Stephan; +3 more
    Publisher: INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS - IEEE
    Country: France

    Going beyond standard lane-departure-avoidance systems, this paper addresses the development of a system that is able to deal with a large set of different traffic situations. Its foundation lies on a thoroughly constituted environment detection through which a decision system is built. From the output of the decision module, the driver is warned or corrected through suited actuators that are coupled to control strategies. The input to the system comes from cameras, which are supplemented by active sensors (such as radar and laser scanners) and vehicle dynamic data, digital road maps, and precise vehicle-positioning data. In this paper, the presented system design is divided into three layers: the perception layer, which is responsible for the environment perception, and the decision and action layers, which are responsible for evaluating and executing actions, respectively.

  • Other research product . Other ORP type . 2016
    Open Access English
    Authors: 
    KOUTA, Nataly;
    Country: France

    Mémoire de stage; The use of adhesively bonded composite reinforcement for steel structures induce a closer study of the adhesive as it is considered the weakest point in the assembly. A reliable numerical damage model has been developed for the adhesively bonded joints and then verified for different types of configurations. A bi- linear traction separation description of a cohesive zone model was used in ABAQUS to simulate the damage evaluation in the adhesive. It was then compared to experimental results for the global structure behavior (local strains, applied load, applied displacement).; L'utilisation des renforcements par composites collés pour des structures métalliques implique une étude plus approfondie des adhésifs puisqu'il s'agit dans ce cas de l'élément le plus faible dans l'assemblage. Un modèle d'endommagement numérique a été développé pour le joint collé étudié et appliqué pour diffèrent type de configurations. Le modèle bi linéaire de traction- séparation (modèle de zone cohésives) est réalisé sur ABAQUS pour visualiser l'évaluation de l'endommagement de l'adhésive et pouvoir réaliser une comparaison avec les investigations expérimentales (déformation locale, effort appliqué, déplacement appliqué).

  • Other research product . Other ORP type . 2019
    Open Access English
    Authors: 
    Nieuwenhuijsen, Mark J.; Agier, Lydiane; Basagaña, Xavier; Urquiza, José; Tamayo-Uria, Ibon; Giorgis-Allemand, Lise; Robinson, Oliver; Siroux, Valérie; Maitre, Léa; de Castro, Montserrat; +17 more
    Publisher: National Institute of Environmental Health Sciences - NIEHS
    Country: France

    Background: The exposome is defined as the totality of environmental exposures from conception onwards. It calls for providing a holistic view of environmental exposures and their effects on human health by evaluating multiple environmental exposures simultaneously during critical periods of life.Objective:We evaluated the association of the urban exposome with birth weight.Methods:We estimated exposure to the urban exposome, including the built environment, air pollution, road traffic noise, meteorology, natural space, and road traffic (corresponding to 24 environmental indicators and 60 exposures) for nearly 32,000 pregnant women from six European birth cohorts. To evaluate associations with either continuous birth weight or term low birth weight (TLBW) risk, we primarily relied on the Deletion-Substitution-Addition (DSA) algorithm, which is an extension of the stepwise variable selection method. Second, we used an exposure-by-exposure exposome-wide association studies (ExWAS) method accounting for multiple hypotheses testing to report associations not adjusted for coexposures.Results:The most consistent statistically significant associations were observed between increasing green space exposure estimated as Normalized Difference Vegetation Index (NDVI) and increased birth weight and decreased TLBW risk. Furthermore, we observed statistically significant associations among presence of public bus line, land use Shannon's Evenness Index, and traffic density and birth weight in our DSA analysis.Conclusion:This investigation is the first large urban exposome study of birth weight that tests many environmental urban exposures. It confirmed previously reported associations for NDVI and generated new hypotheses for a number of built-environment exposures.

Advanced search in
Research products
arrow_drop_down
Searching FieldsTerms
Any field
arrow_drop_down
includes
arrow_drop_down
Include:
96 Research products, page 1 of 10
  • Other research product . Other ORP type . 2010
    Open Access English
    Authors: 
    Chabot, Armelle;
    Publisher: HAL CCSD
    Country: France

    Invited presentation - Visiting University of Reno, USA

  • Other research product . Other ORP type . 2020
    Open Access English
    Authors: 
    ZEGHNI, Sylvain;
    Publisher: HAL CCSD
    Country: France

    Il y a quelques jours, Stephen Roach, économiste renommé, a publié un remarquable article d'opinion dans le "Financial Times". Il a esquissé un avenir de stagflation (faible croissance et de forte inflation) en raison de la fragilité croissante des chaînes et de la baisse de la demande des consommateurs que le confinement a imposée.Selon nous, Stephen Roach a fondamentalement tort. En substance, cet argument réitère la crainte de nombreux nouveaux économistes classiques qui s'inspirent de l'affirmation de Milton Friedman selon laquelle l'inflation est toujours un phénomène monétaire.

  • Open Access English
    Authors: 
    RODRIGUEZ, J;
    Publisher: HAL CCSD
    Country: France

    C06-32 - PROJET RECIFE Convention N° 02 31 0045; Rapport de recherche; Scheduling is the process of allocating resources to activities over time. In a scheduling problem, resources are scarce and constrained in various ways (e.g. in the order of activities and the capacity of resources), and one is looking for a schedule of the activities that both satisfies the constraints and is optimal according to some criteria. This paper deals with an extension of a constraint-based scheduling model of real time management of train traffic through junctions and large stations. This extension allows the improvement of the model of conflicts between trains running in opposite directions with the use of state resources. To tackle large instances, a temporal decomposition has been used. We tested the model and algorithms by applying to problem instances of a real terminal station. Computational results show that with the temporal decomposition method we are able to obtain good solution in short computation time

  • Other research product . Other ORP type . 2005
    Open Access English
    Authors: 
    MARKEWITZ, K; JOUMARD, R;
    Publisher: HAL CCSD
    Country: France

    N° contrat, conv. 1999-RD.10429; Rapport de recherche; L'objectif du travail présenté dans ce document est de définir un modèle d'émission pour les polluants à l'échappement (CO, CO2, HC, NOx et particules) et de consommation de carburant des petits véhicules utilitaires. Un recueil des données a été effectué au sein de différents laboratoires européens et les émissions gazeuses de 150 véhicules testés selon différentes conditions de conduites et de charge ont été recueillies. Le classement des véhicules a été effectué selon le carburant, la norme européenne d'émissions (pre-Euro-1 à Euro-2) et la classification européenne (N1-I, N1-II et N1-III). 24 groupes ont ainsi été distingués. Pour chaque groupe et chacun des polluants réglementaires, un facteur d'émission présenté sous la forme d'une fonction continue du second degré a été établi en fonction de la vitesse moyenne et de la charge et a été statistiquement validé par le test de Pearson

  • Other research product . Other ORP type . 2009
    Open Access English
    Authors: 
    SELLOUM, Ahmed; BETAILLE, David; LE CARPENTIER, Eric; PEYRET, François;
    Country: France

    GPS positioning and map-matching are key technologies used in Car Navigation Systems. Next generation of Cooperative Vehicle Infrastructure Systems (CVIS) will surely require positioning component with higher accuracy, integrity and availability, for instance for the needs of lanelevel applications. The concept of Map Aided Location (MAL) was introduced recently: it consists in considering the map contents (geometry and topology) as constraints in the positioning problem. The main contribution of the work reported in this article concerns the evolution model of the vehicle : whereas previous research investigations were based on usual models in plane coordinates, we propose here an evolution model adapted to the local curvature of the road. Therefore, road constraints are emphasized, particularly when GPS outages occur. An enhanced map (Emap) - where all lanes are represented with decimeter accuracy - is used in this Map Aided Location process.

  • Open Access English
    Authors: 
    BROSSEAUD, Yves;
    Publisher: HAL CCSD
    Country: France

    Présentation des missions et activités du LCPC.

  • Open Access English
    Authors: 
    Soldovieri, Francesco; Masini, Nicola; Alvarez de Buergo, Monica; Dumoulin, Jean;
    Publisher: Society of Exploration Geophysicists
    Country: France

    International audience

  • Open Access English
    Authors: 
    AMDITIS, Angelos; BIMPAS, Matthaios; THOMAIDIS, George; TSOGAS, Manolis; NETTO, Mariana; MAMMAR, Said; BEUTNER, Achim; MOHLER, Nikolaus; WIRTHGEN, Tom; ZIPSER, Stephan; +3 more
    Publisher: INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS - IEEE
    Country: France

    Going beyond standard lane-departure-avoidance systems, this paper addresses the development of a system that is able to deal with a large set of different traffic situations. Its foundation lies on a thoroughly constituted environment detection through which a decision system is built. From the output of the decision module, the driver is warned or corrected through suited actuators that are coupled to control strategies. The input to the system comes from cameras, which are supplemented by active sensors (such as radar and laser scanners) and vehicle dynamic data, digital road maps, and precise vehicle-positioning data. In this paper, the presented system design is divided into three layers: the perception layer, which is responsible for the environment perception, and the decision and action layers, which are responsible for evaluating and executing actions, respectively.

  • Other research product . Other ORP type . 2016
    Open Access English
    Authors: 
    KOUTA, Nataly;
    Country: France

    Mémoire de stage; The use of adhesively bonded composite reinforcement for steel structures induce a closer study of the adhesive as it is considered the weakest point in the assembly. A reliable numerical damage model has been developed for the adhesively bonded joints and then verified for different types of configurations. A bi- linear traction separation description of a cohesive zone model was used in ABAQUS to simulate the damage evaluation in the adhesive. It was then compared to experimental results for the global structure behavior (local strains, applied load, applied displacement).; L'utilisation des renforcements par composites collés pour des structures métalliques implique une étude plus approfondie des adhésifs puisqu'il s'agit dans ce cas de l'élément le plus faible dans l'assemblage. Un modèle d'endommagement numérique a été développé pour le joint collé étudié et appliqué pour diffèrent type de configurations. Le modèle bi linéaire de traction- séparation (modèle de zone cohésives) est réalisé sur ABAQUS pour visualiser l'évaluation de l'endommagement de l'adhésive et pouvoir réaliser une comparaison avec les investigations expérimentales (déformation locale, effort appliqué, déplacement appliqué).

  • Other research product . Other ORP type . 2019
    Open Access English
    Authors: 
    Nieuwenhuijsen, Mark J.; Agier, Lydiane; Basagaña, Xavier; Urquiza, José; Tamayo-Uria, Ibon; Giorgis-Allemand, Lise; Robinson, Oliver; Siroux, Valérie; Maitre, Léa; de Castro, Montserrat; +17 more
    Publisher: National Institute of Environmental Health Sciences - NIEHS
    Country: France

    Background: The exposome is defined as the totality of environmental exposures from conception onwards. It calls for providing a holistic view of environmental exposures and their effects on human health by evaluating multiple environmental exposures simultaneously during critical periods of life.Objective:We evaluated the association of the urban exposome with birth weight.Methods:We estimated exposure to the urban exposome, including the built environment, air pollution, road traffic noise, meteorology, natural space, and road traffic (corresponding to 24 environmental indicators and 60 exposures) for nearly 32,000 pregnant women from six European birth cohorts. To evaluate associations with either continuous birth weight or term low birth weight (TLBW) risk, we primarily relied on the Deletion-Substitution-Addition (DSA) algorithm, which is an extension of the stepwise variable selection method. Second, we used an exposure-by-exposure exposome-wide association studies (ExWAS) method accounting for multiple hypotheses testing to report associations not adjusted for coexposures.Results:The most consistent statistically significant associations were observed between increasing green space exposure estimated as Normalized Difference Vegetation Index (NDVI) and increased birth weight and decreased TLBW risk. Furthermore, we observed statistically significant associations among presence of public bus line, land use Shannon's Evenness Index, and traffic density and birth weight in our DSA analysis.Conclusion:This investigation is the first large urban exposome study of birth weight that tests many environmental urban exposures. It confirmed previously reported associations for NDVI and generated new hypotheses for a number of built-environment exposures.

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