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  • French
    Authors: 
    Genay, Adélaïde; Lécuyer, Anatole; Hachet, Martin;
    Publisher: HAL CCSD
    Country: France

    En raison de la situation sanitaire actuelle (Covid-19), WACAI est reporté du 02 au 04/06/2021; International audience; L’objectif de cet article est de passer en revue la littérature ayant pour sujet l’incarnation en réalité augmentée et les systèmes permettant de l’expérimenter. Il commence par préciser ce qu’est un “avatar” dans ce contexte et introduit les principaux concepts de la notion d’incarnation. Il décrit ensuite les travaux de recherche qui ont contribué à mieux la comprendre et à la mettre en place au sein d’un environnement réel. Dans cette partie, les connaissances sur les composantes du sentiment d’incarnation et sur les facteurs techniques qui l’affectent sont exposées ainsi que les technologies et modes de visualisation utilisés pour l’étudier. Pour terminer, cet article résume et discute de ces résultats afin d’offrir des perspectives de recherches.

  • English
    Authors: 
    Jon Ander Lopez; Victor Isaac Herrera; Haritza Camblong; Aitor Milo; Haizea Gaztanaga;
    Publisher: HAL CCSD
    Country: France

    This paper is focused on analysing the energetic key performance indicators of a hybrid electric bus fleet in order to improve its energy management (at local and fleet level) and profitability. The analysed fleet is composed of buses with parallel and series configurations and include energy storage systems based on batteries and ultra capacitors. The test routes have been selected from a data base of urban standardised cycles. In a first stage, a dynamic programming approach has been applied to determine the initial optimal operation performance for each bus route. Then, several disruptions (e.g. traffic jams, auxiliary consumption and passenger variations) have been added to the routes to simulate "real" road and daily operation conditions. In this paper, a fleet learning methodology is proposed to analyse, process and decide based on the collected data from "real" conditions of the whole fleet. This data is used for monitoring the energetic key performance factors by learning from the buses with the best energetic behaviour. Finally, a decision making process is applied to improve the local energy management of the less-efficient bus.

  • Open Access English
    Authors: 
    Nuno Amaro; Luís Casimiro; J. Pina; João Martins; J M Ceballos;
    Publisher: HAL CCSD

    Part 12: Energy: Improvement; International audience; Superconducting Magnetic Energy Storage (SMES) is a class of promising superconducting devices, considering its possible applications in power systems. This paper describes a combination of a SMES with a Unified Power Quality Conditioner (UPQC) for power quality improvement in an electric grid. The SMES device is used to improve the UPQC performance by increasing the stored energy in the DC link. Several power quality faults including voltage sags and current harmonics are simulated and the system behavior is demonstrated. This hybrid system has the advantage of being able to overcome different kinds of power quality faults with higher performance than as a set of individual systems, thus increasing power quality in electric grids.

  • Publication . Part of book or chapter of book . Article . Conference object . 2017
    Open Access
    Authors: 
    Sonia Cárdenas-Delgado; M. Carmen Juan; Magdalena Méndez-López; Elena Pérez-Hernández;
    Countries: France, Spain

    Part 2: Aging and Disabilities; International audience; People with stereo-deficiencies usually have problems for the perception of depth using stereo devices. This paper presents a study that involves participants who did not have stereopsis and participants who had stereopsis. The two groups of participants were exposed to a maze navigation task in a 3D environment in two conditions, using a HMD and a large stereo screen. Fifty-nine adults participated in our study. From the results, there were no statistically significant differences for the performance on the task between the participants with stereopsis and those without stereopsis. We found statistically significant differences between the two conditions in favor of the HMD for the two groups of participants. The participants who did not have stereopsis and could not perceive 3D when looking at the Lang 1 Stereotest did have the illusion of depth perception using the HMD. The study suggests that for the people who did not have stereopsis, the head tracking largely influences the 3D experience.

  • Publication . Conference object . 2017
    Open Access English
    Authors: 
    Oscar Alvear; Nicola Roberto Zema; Enrico Natalizio; Carlos T. Calafate;
    Publisher: HAL CCSD
    Country: France
    Project: ANR | SUPER (ANR-11-IDEX-0004)

    Due to their deployment flexibility, Unmanned Aerial Vehicles have been found suitable for many application areas, one of them being air pollution monitoring. In fact, deploying a fleet of Unmanned Aerial Vehicles (UAVs) and using them to take environmental samples is an approach that has the potential to become one of the key enabling technologies to enforce pollution control in industrial or rural areas. In this paper, we propose to use an algorithm called Pollution-driven UAV Control (PdUC) that is based on a chemotaxis metaheuristic and a Particle Swarm Optimization (PSO) scheme that only uses local information. Our approach will be used by a monitoring Unmanned Aerial Vehicle to swiftly cover an area and map the distribution of its aerial pollution. We show that, when using PdUC, an implicit priority is applied in the construction of pollution maps, by focusing on areas where the pollutants' concentration is higher. In this way, accurate maps can be constructed in a faster manner when compared to other strategies. We compare PdUC against various standard mobility models through simulation, showing that our protocol achieves better performances, by finding the most polluted areas with more accuracy, within the time bounds defined by the UAV flight time.

  • Publication . Article . Conference object . Preprint . Part of book or chapter of book . 2016
    Open Access English
    Authors: 
    Gregory Kucherov; Kamil Salikhov; Dekel Tsur;
    Publisher: HAL CCSD
    Country: France

    International audience; We study strategies of approximate pattern matching that exploit bidirectional text indexes, extending and generalizing ideas of [5]. We introduce a formalism, called search schemes, to specify search strate-gies of this type, then develop a probabilistic measure for the efficiency of a search scheme, prove several combinatorial results on efficient search schemes, and finally, provide experimental computations supporting the superiority of our strategies.

  • Publication . Part of book or chapter of book . Conference object . 2015
    Open Access English
    Authors: 
    Marco Romano; Andrea Bellucci; Ignacio Aedo;
    Publisher: HAL CCSD

    International audience; Considering users preferences and behaviour is a necessity to develop accessible interaction for blind people. Mainstream mobile devices are widely used by people with disabilities but, despite the growing interest of the research community around accessibility issues of touch interfaces, there is still much to understand about how best to design the interaction of blind people with mobile technologies. To this end, we conducted a preliminary elicitation study (8 participants) to understand how blind people perform touch and motion gestures for common tasks on a mobile phone. We found that blind people do not use motion gestures. We provide a discussion of our results according to the type of gestures performed.

  • Publication . Conference object . Part of book or chapter of book . 2018
    Open Access English
    Authors: 
    Wangshu Chen; Julien Colin; Joel Casalinho; Mohammed El Amine Ben Amara; Moncef Stambouli; Patrick Perré;
    Publisher: HAL CCSD
    Countries: France, France, Spain

    Vibration is a promising way to intensify the drying process through heating-up due to viscous dissipation, activation of internal liquid transfer and increase of external transfer. To better assess the possible contribution of these effects, we choose a multiscale approach. This paper is focused on the pore scale, simulated by a capillary tube partially filled with water subjected to sinusoidal vibrations. We studied the displacement of water inside this tube through image analysis. This configuration mimics the moisture transfer inside the pores of a porous media during drying. The experimental device developed in this study is applicable to a wide range of configurations, such as symmetrical or asymmetrical vibrations. Keywords: drying intensification, acoustic vibration, pore scale, symmetrical and asymmetrical signals, image processing.

  • Closed Access
    Authors: 
    Ramon Gonzalez; Mirko Fiacchini; Teodoro Alamo; José Luis Guzmán; Francisco Rodríguez;
    Country: France

    This paper presents a control law for the trajectory tracking of mobile robots under slip conditions and subject to both system constraints and varying dynamics. First, a control law is obtained based on a Lyapunov function to guarantee closed-loop asymptotic stability, resulting in a set of feedback gains, one for each extreme model realization. On-line computation is devoted to determine an adaptive feedback control law for the current realization of the state as a convex combination of the gains previously obtained. Simulations comparing the proposed control law with other strategies under slip conditions are provided. They show the satisfactory behavior of the proposed control strategy.

  • Spanish
    Authors: 
    Cagiao Vila, Pilar;
    Publisher: HAL CCSD
    Country: France

    International audience; La historia de las relaciones entre España y América conoció uno de sus momentos más singulares precisamente durante las celebraciones de los Centenarios de las Independencias y posiblemente fue en la Argentina donde el reencuentro con la antigua Madre Patria encontró una de sus expresiones más acabadas.

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