Institute Francais des science

Villeurbanne, France

Institute Francais des science

Villeurbanne, France
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Preteseille M.,Institute Francais Des science | Hornych P.,Institute Francais Des science | Lenoir T.,Institute Francais Des science
Advances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012 | Year: 2012

High Speed Rail (HSR) projects are multiplying and need technological innovations to be economically, socially and environmentally reliable. The reuse of in-situ materials treated with lime and/or hydraulic binders for the capping layer of HSR infrastructures is a process in accordance with sustainable development. However, although stress paths in the treated capping layer are now well characterized thanks to numerical modelling, the long term mechanical performances of treated materials are not well defined. For the design of HSR structures, an estimation of these performances must be known. Stress paths induced by fatigue tests referenced from the literature are studied and compared with those obtained in the HSR capping layer. The results show that no existing test is currently able to reproduce the stress paths and the principle of a consistent test is presented. © 2012 Taylor & Francis Group.

Da Fonseca R.,Ampere Laboratory | Bideaux E.,Ampere Laboratory | Sari A.,Ampere Laboratory | Gerard M.,CEA Grenoble | And 3 more authors.
2013 9th Asian Control Conference, ASCC 2013 | Year: 2013

In this paper, a non linear control strategy is applied to the air supply subsystem of a polymer electrode membrane fuel cell (PEMFC). Based on a simplified control model and using the differential flatness control theory, a controller is designed in order to regulate the most important variables in the air supply subsystem: the oxygen stoechiometry and the cathode pressure. The non linear control approach is validated using a real fuel cell system, presenting a good response compared with a PID classical approach. © 2013 IEEE.

Roge J.,Institute Francais des science | Roge J.,University of Lyon | El Zufari V.,Institute Francais des science | El Zufari V.,University of Lyon | And 4 more authors.
Safety Science | Year: 2015

Objective: The aim of this study was to evaluate the possibility of enhancing the visibility of motorcycles and pedestrians for motorists via safety messages concerning the vulnerability of these road users. Background: In several cases of collision between cars and vulnerable road users (VRU), car drivers failed to detect the latter in time to avoid collision because of their low conspicuity. Method: 2 groups of 17 motorists (23.6. years old) carried out a VRU detection task in 2 sessions in a car-driving simulator after either watching or not watching a film presenting safety messages about the vulnerability of these road users. Participants had to detect pedestrians and motorcyclists standing at the road side or who appeared on different parts of the road. Results: The group of motorists who watched the film detected these VRUs at a greater distance and drove safely in zones which constitute a high risk of collision for pedestrians (key areas). Only the intensity of anger felt after the film can explain the improvement in VRU visibility distance. Moreover, this improvement was also associated with a modification in speed management in key areas. This last result provides evidence of the importance of top down processes in the detection of VRUs by motorists. Conclusion: The film enhanced VRU visibility and led to safer driving behaviour for pedestrians. Application: The practical implications of these results for safety campaigns and future directions of research on the emotional states of motorists and their perception during driving are considered. Short abstract: We examine motorists' ability to detect motorcycles and pedestrians (VRUs) in a simulated car-driving task after watching a film presenting safety messages about VRU vulnerability. Informed motorists detect VRU sooner and drive in a safer way for pedestrians. We also consider practical implications and futures lines of research related to safety campaigns. © 2015 Elsevier Ltd.

Betaille D.,Institute Francais des science | Peyret F.,Institute Francais des science | Ortiz M.,Institute Francais des science | Miquel S.,Societe de Calcul Mathematique SA | Fontenay L.,Societe de Calcul Mathematique SA
IEEE Intelligent Transportation Systems Magazine | Year: 2013

Abstract?Digital maps with 3D data proved to make it possible the determination of Non-Line-Of-Sight (NLOS) satellites in real time, whilst moving, and obtain significant benefit in terms of navigation accuracy. However, such data are difficult to handle with Geographical Information System (GIS) embedded software in real time. The idea developed in this article consists is proposing a method, light in terms of information contents and computation throughput, for taking into account the knowledge of the 3D environment of a vehicle in a city, where multipath phenomena can cause severe errors in positioning solution. This method makes use of a digital map where homogeneous sections of streets have been identified, and classified among different types of urban trenches. This classification is so called: ?Urban Trench Model?. Not only NLOS satellites can be detected, but also, if needed, the corresponding measurements can be corrected and further used in the positioning solver. The paper presents in details the method and its results on several real test sites, with a demonstration of the gain obtained on the final position accuracy. The benefit of the Urban Trench Model, i.e. the reduction of positioning errors as compared to conventional solver considering all satellites, gets up to an amount between 30% and as much as 70% e.g. in Paris. © 2009-2012 IEEE.

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