Search results for "Informatique"
showing 10 items of 121 documents
Télécollaboration asymétrique en réalité virtuelle
2016
National audience; Nous présentons une première étude de combinaison de deux systèmes asymétriques de réalité virtuelle dans un contexte de travail collaboratif : un système de type CAVE et un casque immersif. L’architecture, de type serveur-client, permet une collaboration entre plusieurs utilisateurs. Les expériences sur une tâche de construction de puzzles en un temps limité, seul et en collaboration, montrent que l’utilisation combinée de systèmes asymétriques CAVE et casques permet d’améliorer les performances des utilisateurs. Par ailleurs les utilisateurs préfèrent le travail en collaboration et sont plus efficaces ensemble. Ces résultats ouvrent des perspectives intéressantes de com…
Les usages de la micro-informatique et d'internet dans les écoles primaires francophones
2000
International audience; Le présent article se propose d'apporter un éclairage sur les pratiques pédagogiques en matière d'utilisation de la micro-informatique à l'école. A partir d'un sous-ensemble particulier d'écoles, à savoir des écoles primaires francophones disposant en 1998 d'une connexion Internet, une enquête a été réalisée pour conna\ⁱtre les enseignants qui sont à l'origine de cette connexion, leurs pratiques informatiques personnelles, les pratiques qu'ils encadrent à l'école et le poids de ces pratiques au sein des activités d'apprentissage traditionnelles. Il en ressort que les activités informatiques des élèves francophones sont fortement dépendantes de l'intérêt que leur ense…
A Trusted Hybrid Learning Approach to Secure Edge Computing
2021
Securing edge computing has drawn much attention due to the vital role of edge computing in Fifth Generation (5G) wireless networks. Artificial Intelligence (AI) has been adopted to protect networks against attackers targeting the connected edge devices or the wireless channel. However, the proposed detection mechanisms could generate a high false detection rate, especially against unknown attacks defined as zero-day threats. Thereby, we propose and conceive a new hybrid learning security framework that combines the expertise of security experts and the strength of machine learning to protect the edge computing network from known and unknown attacks, while minimizing the false detection rat…
Weld pool surface temperature measurement from polarization state of thermal emission
2014
This paper presents a passive polarimetry method using a division of aperture optical device in order to measure the temperature distribution at the weld pool surface. Thermal emission from a hot liquid metal was investigated at a near-infrared wavelength corresponding to a blind spectral window of a helium plasma generated during gas tungsten arc welding process. The refractive index of liquid metal and the surface radiance are deduced from the polarisation state of thermal emissions. Based upon the knowledge of both characteristics, the temperature distribution can be calculated. Conseil Régional de Bourgogne
Implicit learning of a repeated segment in continuous tracking: A reappraisal
2006
Several prior studies (e.g., Shea, Wulf, Whitacre, & Park, 2001; Wulf & Schmidt, 1997) have apparently demonstrated implicit learning of a repeated segment in continuous-tracking tasks. In two conceptual replications of these studies, we failed to reproduce the original findings. However, these findings were reproduced in a third experiment, in which we used the same repeated segment as that used in the Wulf et al. studies. Analyses of the velocity and the acceleration of the target suggests that this repeated segment could be easier to track than the random segments serving as control, accounting for the results of Wulf and collaborators. Overall these experiments suggest that lea…
Real time polarization imaging of weld pool surface
2015
The search for an efficient on-line monitoring system focused on the real-time analysis of arc welding quality is an active area of research. The topography and the superficial temperature field of the weld pool can provide important information which can be used to regulate the welding parameters for depositing consistent welds. One difficulty relies on accessing this information despite the bright dazzling welding arc. In the present work, Stokes polarimetry and associated shape-from-polarization methods are applied for the analysis of the weld pool through its 810 nm-wavelength infrared emissions. The obtained information can provide a better understanding of the process, such as the usa…
Mechanical Bistable Structures for Microrobotics and Mesorobotics from Microfabrication to Additive Manufacturing
2018
International audience; The use of mechanical bistable structures in the design of microrobots and mesorobots has many advantages especially for flexible robotic structures. However, depending on the fabrication technology used, the adequacy of theoretical and experimental mechanical behaviors can vary widely. In this paper, we present the manufacturing results of bistable structures made with two extensively used contemporary technologies: MEMS and FDM additive manufacturing. Key issues of these fabrication technologies are discussed in the context of microrobotics and mesorobotics applications.
Retours sur une mise en ligne
2004
http://lemo.irht.cnrs.fr/43/43-08.htm; International audience
L'e-mail et la recherche en histoire médiévale
2004
http://lemo.irht.cnrs.fr/varia/email.htm; International audience
L'informatique à l'école élémentaire en France
1985
Communication faite à l'occasion du "INCONTRO INTERNAZIONALE" Castello Pasquini CASTIGRIONCELLO 29 - 30 MARZO 1985 "IL BAMBINO TECHNOLOGICO 85"; International audience