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Search Results: 1 - 10 of 600 matches for " Maxime Pelcat "
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An Open Framework for Rapid Prototyping of Signal Processing Applications
Maxime Pelcat,Jonathan Piat,Matthieu Wipliez,Slaheddine Aridhi
EURASIP Journal on Embedded Systems , 2009, DOI: 10.1155/2009/598529
Abstract: Embedded real-time applications in communication systems have significant timing constraints, thus requiring multiple computation units. Manually exploring the potential parallelism of an application deployed on multicore architectures is greatly time-consuming. This paper presents an open-source Eclipse-based framework which aims to facilitate the exploration and development processes in this context. The framework includes a generic graph editor (Graphiti), a graph transformation library (SDF4J) and an automatic mapper/scheduler tool with simulation and code generation capabilities (PREESM). The input of the framework is composed of a scenario description and two graphs, one graph describes an algorithm and the second graph describes an architecture. The rapid prototyping results of a 3GPP Long-Term Evolution (LTE) algorithm on a multicore digital signal processor illustrate both the features and the capabilities of this framework.
An Open Framework for Rapid Prototyping of Signal Processing Applications
Pelcat Maxime,Piat Jonathan,Wipliez Matthieu,Aridhi Slaheddine
EURASIP Journal on Embedded Systems , 2009,
Abstract: Embedded real-time applications in communication systems have significant timing constraints, thus requiring multiple computation units. Manually exploring the potential parallelism of an application deployed on multicore architectures is greatly time-consuming. This paper presents an open-source Eclipse-based framework which aims to facilitate the exploration and development processes in this context. The framework includes a generic graph editor (Graphiti), a graph transformation library (SDF4J) and an automatic mapper/scheduler tool with simulation and code generation capabilities (PREESM). The input of the framework is composed of a scenario description and two graphs, one graph describes an algorithm and the second graph describes an architecture. The rapid prototyping results of a 3GPP Long-Term Evolution (LTE) algorithm on a multicore digital signal processor illustrate both the features and the capabilities of this framework.
Optimization of automatically generated multi-core code for the LTE RACH-PD algorithm
Maxime Pelcat,Slaheddine Aridhi,Jean Fran?ois Nezan
Computer Science , 2008,
Abstract: Embedded real-time applications in communication systems require high processing power. Manual scheduling devel-oped for single-processor applications is not suited to multi-core architectures. The Algorithm Architecture Matching (AAM) methodology optimizes static application implementation on multi-core architectures. The Random Access Channel Preamble Detection (RACH-PD) is an algorithm for non-synchronized access of Long Term Evolu-tion (LTE) wireless networks. LTE aims to improve the spectral efficiency of the next generation cellular system. This paper de-scribes a complete methodology for implementing the RACH-PD. AAM prototyping is applied to the RACH-PD which is modelled as a Synchronous DataFlow graph (SDF). An efficient implemen-tation of the algorithm onto a multi-core DSP, the TI C6487, is then explained. Benchmarks for the solution are given.
Useful or Not? How Schizophrenic Patients Process the Relevance of a Visual Stimulus  [PDF]
Maxime Bubrovszky, Pierre Thomas
Journal of Behavioral and Brain Science (JBBS) , 2011, DOI: 10.4236/jbbs.2011.13015
Abstract: Introduction: The impairment of relevant information selection results in clinical symptoms of schizophrenia. Previous studies assessing visual modality, have reported an impairment of automatic sensory information processing related to abnormal irrelevant stimuli processing. In healthy subjects, neurophysiologic studies have distinguished two early posterior components which the second could be considered as a deviant processing marker. We propose to explore early selective properties of attention in acute patients using event related potential (ERP) methods. We hypothesize an impairment of the detection of deviant stimuli processing, supported by sensory integration neural region. Materiel and method: Ten patients suffering from an acute episode of schizophrenia and ten controls were assessed with a simple three stimuli oddball paradigm analysed by principal components analysis (PCA) method which allows to separate overlapping components and to evaluate their modifications. Result: PCA distinguished two posterior negative components between 100 and 230 msec. The early one was not different between controls and patients. The later one was significantly decreased in the patients group. Discussion: two different physiological components involved in stimuli detection were clearly isolated. The earliest, reflecting elementary perceptive process seems to be preserved in patients with acute schizophrenia whereas the later component, reflecting integrative processing involved in detection of deviance was impaired. These results could be a clue to understand clinical distractibility.
Lipooxygenase inhibition in osteoarthritis: a potential symptomatic and disease modifying effect?
Maxime Dougados
Arthritis Research & Therapy , 2008, DOI: 10.1186/ar2490
Abstract: In the previous issue of Arthritis Research & Therapy, Sengupta and colleagues [1] report the results of a short-term placebo randomized controlled trial evaluating both the symptomatic and biological effects of the compound 5-Loxin?, which is a gum resin extracted from an ancient herb. Despite the small sample size (25 patients per arm) and the short duration of this trial (3 months), the reported results are interesting and intriguing for several reasons.In the field of rheumatology, most new therapeutic compounds are based on our knowledge of the pathophysiological pathways of the disease (for example, targeted therapies against cytokines such as tumor necrosis factor (TNF), interleukin-6, and so on) or against some specific enzyme (for example, cyclooxygenases). The compound evaluated in the trial reported by Sengupta and colleagues [1] is in fact derived from an ancient herb, Boswella. Because of the empirically observed anti-arthritic and analgesic effects of this compound, researchers have tried to understand its mechanism of action. In vitro data suggest that 5-Loxin? might be considered as a potent lipooxygenase inhibitor but also, at a lower magnitude, an inhibitor of the TNFα-induced gene expression of matrix metalloproteinases. Such in vitro findings have to be kept in mind when interpreting the results of the trial. In particular, should we consider that the observed symptomatic treatment effect is related to the lipooxygenase inhibition, to the anti-TNFα inhibition, to both, or to an as yet unknown mechanism?This trial has been conducted in India. The researchers have to be congratulated because of the high quality of both the design, the conduct, the analysis and the reporting of the trial.The observed symptomatic placebo effect is of a similar magnitude as those observed in previous placebo randomized controlled trials in this condition [2,3]. The observed symptomatic effect (for example, the differences in the changes in the active minus the placebo
TOPOGRAFíA Y ASTRONOMíA: DOS HERRAMIENTAS DE APOYO EN ARQUEOLOGíA
Boccas,Maxime;
Chungará (Arica) , 2004, DOI: 10.4067/S0717-73562004000400039
Abstract: in the last decade, multidisciplinary archaeoastronomical investigations have demonstrated some increasing maturity and have brought significant knowledge to prehistory. alignment investigations in a prehistoric site are based on topographic analysis, which allows sometimes to show the relationship that people established with their terrestrial environment (sacred landscape). in some cases, a relationship with celestial objects, especially the sun at the solstice time, was also present in order to measure time and thus organize labor and ritual activities. we will recall some basic concepts for an archaeoastronomy investigation, then we focus on some interesting examples worldwide, and finally we present a few chilean sites that could exhibit archaeoastronomical features
Las movilizaciones sociales: aportes recientes de la sociología francesa
Haubert, Maxime;
Revista mexicana de sociología , 2011,
Abstract: although french social sciences have lost much of their leadership regarding the study of social mobilizations, they have maintained significant specificities, particularly the key explanatory role attributed to relations with global society and the state and the demand for civil rights (as in the suburban riots of 1995). recent studies tend to ignore labor conflicts, focusing instead on the movements of those who have been excluded or marginalized and their militant leaders.
Intermédialité et création musicale : l’exemple des Wirkunst
Maxime McKinley
Synergies Canada , 2012,
Abstract: Ce texte consiste en une réflexion sur l’intermédialité (rapports inter-arts) comme fondement d’une musique narrative, au regard d’une série de huit uvres intitulée Wirkunst. Les Wirkunst sont tous basés sur des uvres provenant des arts visuels, de la littérature ou du cinéma. Dans la première partie, j’explique d’abord les notions de sémiologie sur lesquelles s’appuient mes recherches. Ensuite, je présente la grille d’interprétation musicale des uvres d’art à partir de laquelle je transforme ma réception d’une uvre d’art en uvre musicale. Enfin, je propose une définition de la narrativité musicale inhérente aux Wirkunst en insistant sur le domaine de la perception, notamment sur la pluralité des niveaux de lecture possibles, conceptuels et sonores.
La création d’un réseau de villes : circulations, pouvoirs et territoires
Maxime Huré
Métropoles , 2009,
Abstract: Cet article vise à questionner les effets d’un réseau de villes sur les politiques publiques urbaines à travers la naissance et l’évolution du Club des Villes Cyclables. Autrement dit, il s’agit d’ouvrir la boite noire d’un réseau de villes en analysant sa genèse, sa structure, ses enjeux, son activité, afin de mettre en lumière sa capacité à transformer les cadres de l’action publique urbaine. La description historique et institutionnelle du réseau montre l’importance des circulations dans chaque phase de développement du Club, à la fois à l’intérieur du réseau et sur les territoires urbains. Dans un premier temps, on observe ces circulations dès la genèse du réseau, à une période où le Club des Villes Cyclables souhaite constituer un lobby national du vélo urbain. Dans un deuxième temps, les circulations vont s’orienter vers l’échelle urbaine, à travers l’avènement d’un pouvoir d’agglomération technique et politique. Enfin, le réseau et ses circulations constituent, de plus en plus, un enjeu pour les territoires et les politiques publiques urbaines. What impact a cities network can have on urban public policies ? This article purpose is to enlighten this question through the birth, and evolution, of the Club des Villes Cyclables (Biking Cities Club). In other words to open the black box of a cities network and analyse its genesis, its structure, its stakes, its activity, and eventually show its ability to transform the framework of public urban policies. The historical and institutional description of the network underlines the importance of circulations in each stage of development of the Club, at once within the network and in the urban areas. These circulations can be observed from the genesis of the network, when the Club was willing to constitute a national lobby of urban biking. Later on, circulations will turn onto the urban scale, through the advent of a technical and political urban authority. Now, it appears that the network and its circulations constitute, more and more, a stake for the territories administration and the urban public policy.
Philippe Hamman (dir.), Le Tramway dans la ville. Le projet urbain négocié à l’aune des déplacements
Maxime Huré
Métropoles , 2011,
Abstract: L’ouvrage dirigé par Philippe Hamman est aujourd’hui incontournable pour ceux qui s’intéressent à la fabrique de l’urbain et aux questions de mobilité en ville. Il est incontournable au niveau de son objet d’étude. En effet, le tramway est de retour dans de nombreuses villes européennes. Il participe à transformer l’organisation spatiale, sociale ou encore institutionnelle des villes. Mais l’ouvrage est aussi incontournable car le Tramway dans la ville pose toute une série de question...
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