Interface de détection térahertz par imagerie en realite augmentée

Neuvième Conférence Plénière du GDR ONDES les 30 novembre et 1er décembre 2021, au pôle évènementiel de LILLIAD, Université de LilleAfin de pouvoir cartographier des mesures issues d'un capteur térahertz, nous avons développé un banc de test combinant un radar à onde continue à modulation de fréquence (FMCW) couplé à un scanphone qui va permettre de placer en réalité augmentée une grille de mesure a un emplacement voulu. L'architecture réalisée assure une manipulation simple pendant le processus d'acquisition tandis que la visualisation des résultats peut être effectuée en direct directement avec un smartphone, avec une vue 3D en réalité augmentée superposée en direct

Mining Tracks of Competitive Video Games

The development and professionalization of a video game requires tools for analyzing the practice of the players and teams, their tactics and strategies. These games are very popular and by nature numerical, they provide many tracks that we analyzed in terms of team play. We studied Defense of the Ancients (DotA), a Multiplayer Online Battle Arena (MOBA), where two teams battle in a game very similar to rugby or American football. Through topological measures - area of polygon described by the players, inertia, diameter, distance to the base - that are independent of the exact nature of the game, we show that the outcome of the match can be relevantly predicted. Mining e-sport's tracks is opening interest in further application of these tools for analyzing real time sport.http://wikicfp.com/cfp/servlet/event.showcfp?eventid=35698©ownerid=518

Immunité aux interférences des systèmes de communication à lumière visible

International audienceLes systèmes de communication basées sur la lumière visible recourent au double usage des infrastructures d'éclairage pour transmettre données. Cette technologie est considérée sécure, à bon marché et immune aux interférences causées par les fréquences radio. L'interférence optique est l'unique source de perturbation externe normalement considéré dans les modèles de canal. Néanmoins, toutes les interférences sur les composants électroniques, susceptibles d'avoir un impact sur les performances du système, doivent être intégrées dans le modèle de transmission afin d'améliorer les performances du système de communication. Dans ce papier, on analyse l'interférence et l'immunité des systèmes VLC en ce qui concerne les fréquences couvrant tout le spectre jusqu' à 1 GHz. Nous fournissons une évaluation détaillée de l'immunité d'un système VLC réalisé en chambre anéchoïque, en considérant des interférences avec différents niveaux de puissance. Les résultats sont très intéressants. En considérant des valeurs de fréquence spécifiques, le signal transmis par VL est trop perturbé pour être correctement récupéré. Afin d'évaluer l'impact de cette interférence, on a estimé le Bit Error Rate (BER) pour différentes indexes de modulation, en considérant une modulation de position d'impulsions (mPPM)

On the Interference Immunity of Visible Light Communication (VLC)

International audienceVisible Light Communication (VLC) relies on the dual use of existing light infrastructure for wirelessly send data. VLC is regarded as a "green", cost-effective and secure communication technology. Moreover, VLC has been always considered immune to Radio Frequency (RF) waves. The only type of interference that has always been included in the channel model is the optical interference. Nevertheless, all the interference components potentially impacting on the performance of the system should be integrated in the transmitting model in order to improve the performance of the communication system. In this paper, we investigate on the interference and immunity of the VLC systems in respect of frequencies spanning the spectrum up to 1 GHz. We provide a detailed evaluation of the immunity of a VLC system by the means of experiments realized in "controlled" environment, i.e. an anechoic chamber, by considering interference at different power levels. Results are very interesting, since at specific frequency values, the VL transmitted signal results too "interfered" and noisy to be correctly recovered. In order to evaluate the impact of this interference, we have estimated the Bit Error Rate (BER) for different index modulations of Pulse-Position Modulation (mPPM)

Real-time 3D electromagnetic field measurement instrument with direct visualization

Nowadays, a wide variety of terminals are proposed to nomadic users. Generally these terminals provide wireless communication operating at frequencies between one and a few GHz. For technical reasons, including multiple access to the communication channel and battery autonomy, these terminals transmit only during very short periods i.e. transmission bursts. For a direct observation of certain characteristics of the transmitted signals radiated by such terminals, only a few measurement setups exist. This article proposes such a novel real-time 3D electromagnetic field measurement instrument with direct visualization. The prototype used for validation is based on an array of probes regularly attached on a non-conductive rigid loop which is put into fast rotation around the terminal under test. To cite this article: J. Rioult et al., C. R. Physique 10 (2009). (C) 2008 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved

Fouille de traces dans le sport électronique : recommandation stratégique, analyse spatiale et enjeux pour le sport réel

International audienceLe développement et la professionnalisation du jeu vidéo suscitent le besoin d'outils adaptés à l'analyse de la pratique des joueurs, selon des axes sportif, tactique et stratégique. Très populaires et par nature informatique, ces jeux fournissent de nombreuses traces. Dans le cadre d'un jeu opposant deux équipes de cinq joueurs (un MOBA, Multiplayer Online Battle Arena), analogue au Rugby, nous montrons que la fouille de ces traces est fructueuse. Elle permet d'émettre des recommandations stratégiques et l'analyse des configurations spatiales des joueurs fournit des indications précieuses sur l'issue du match. La fouille de traces de sport électronique ouvre des perspectives intéressantes pour l'analyse stratégique du sport réel. ABSTRACT. The development and professionalization of video game require tools for analysing the practice of the players and teams, their tactics and strategies. Very popular and by nature numerical, these games provide many tracks that we analyze in terms of team play. We study DotA, a MOBA-like (Multiplayer Online Battle Arena), where two teams battle in a game very similar to rugby or American football. We show through topological measures-area of polygon described by the players, inertia, diameter, distance to the goal-that are independent with the exact nature of the game, that simple measures on spacial tracks allow for relevantly predicting the outcome of the match. MOTS-CLÉS : jeu vidéo, sport électronique, fouille de traces, recommandation, stratégie KEYWORDS: video game, electronic sport, track mining ICT10, le 25 mai 2010. 2 ICT1

Mussel as a Tool to Define Continental Watershed Quality

Bivalves appear as relevant sentinel species in aquatic ecotoxicology and water quality assessment. This is particularly true in marine ecosystems. In fact, several biomonitoring frameworks in the world used mollusks since several decades on the base of contaminant accumulation (Mussel Watch, ROCCH) and/or biological responses called biomarker (OSPAR) measurements. In freshwater systems, zebra and quagga mussels could represent alternative sentinels, which could be seen as the counterparts of mussel marine species. This chapter presents original studies and projects underlying the interest of these freshwater mussels for water quality monitoring based on contaminant accumulation and biomarker development measurements. These sentinel species could be used as a tool for chemical/biological monitoring of biota under the European water framework directive and for the development of effect-based monitoring tools

Occlusion of LTP-Like Plasticity in Human Primary Motor Cortex by Action Observation

Passive observation of motor actions induces cortical activity in the primary motor cortex (M1) of the onlooker, which could potentially contribute to motor learning. While recent studies report modulation of motor performance following action observation, the neurophysiological mechanism supporting these behavioral changes remains to be specifically defined. Here, we assessed whether the observation of a repetitive thumb movement – similarly to active motor practice – would inhibit subsequent long-term potentiation-like (LTP) plasticity induced by paired-associative stimulation (PAS). Before undergoing PAS, participants were asked to either 1) perform abductions of the right thumb as fast as possible; 2) passively observe someone else perform thumb abductions; or 3) passively observe a moving dot mimicking thumb movements. Motor evoked potentials (MEP) were used to assess cortical excitability before and after motor practice (or observation) and at two time points following PAS. Results show that, similarly to participants in the motor practice group, individuals observing repeated motor actions showed marked inhibition of PAS-induced LTP, while the “moving dot” group displayed the expected increase in MEP amplitude, despite differences in baseline excitability. Interestingly, LTP occlusion in the action-observation group was present even if no increase in cortical excitability or movement speed was observed following observation. These results suggest that mere observation of repeated hand actions is sufficient to induce LTP, despite the absence of motor learning

Ile-et-Vilaine. Un devis inédit de Viollet-le-Duc aux Archives départementales

Rioult Jean-Jacques. Ile-et-Vilaine. Un devis inédit de Viollet-le-Duc aux Archives départementales. In: Bulletin Monumental, tome 145, n°2, année 1987. pp. 205-206

A reappraisal of Lignier's Mesozoic fossil wood collection: Ages, nomenclature and taxonomy

International audienc