Extraction de concepts sous contraintes dans des données d'expression de gènes

National audienceIn this paper, we propose a technique to extract constrained formal concepts

An average study of hypergraphs and their minimal transversals

International audienceIn this paper, we study some average properties of hypergraphs and the average com-plexity of algorithms applied to hypergraphs under different probabilistic models. Our approach is both theoretical and experimental since our goal is to obtain a random model that is able to capture the real-data complexity. Starting from a model that generalizes the Erdös-Renyi model [9, 10], we obtain asymptotic estimations on the average number of transversals, minimals and minimal transversals in a random hy-pergraph. We use those results to obtain an upper bound on the average complexity of algorithms to generate the minimal transversals of an hypergraph. Then we make our random model more complex in order bring it closer to real-data and identify cases where the average number of minimal tranversals is at most polynomial, quasi-polynomial or exponential

Abitare il tempo. L'anima tra ritmo e cadenza nel pensiero di Simone Weil

Questo breve studio mira a esplorare il concetto di ritmo nell’opera di Simone Weil (1909-1943). Dopo aver compreso l'importanza del ritmo a diretto contatto con il mondo operaio, estenderà le sue riflessioni fino a renderlo un operatore centrale della sua metafisica

Anodal Transcranial Direct Current Stimulation Enhances Procedural Consolidation

n/

High temperature oxidation of a Cu-Ni – based cermet: kinetic and microstructural study

International audienceThe oxidation of a cermet composed of nickel ferrite (NixFe3-xO4), nickel oxide (NiyFe1-yO) and Ni-Cu alloy (CuzNi1-z) (with x=0.8, y=0.84 and z=0.44) has been studied by thermogravimetry, at 960°C, under controlled oxygen partial pressure. The rate of oxidation increases with the oxygen partial pressure up to 5.1 103 Pa, then it becomes independent of the oxygen pressure. This is due to the presence of the two copper oxides, CuO and Cu2O, above this oxygen pressure. SEM observation of oxidized samples has shown that the oxidation mechanism involves both external and internal oxidation

Manipulating the ferroelectric polarization state of BaTiO 3 thin films

International audienceControlling the ferroelectric polarization at macroscopic or microscopic levels is crucial in the framework of the development of ferroelectric materials used in yet challenging photo-electrochemical (PEC) cells and spintronic applications. We report here on polarization methods allowing to electrically polarize prototypical samples of BaTiO 3 (001) films. Epitaxial single crystalline layers were grown up to a thickness of 25 nm by atomic oxygen assisted molecular beam epitaxy on 1 at.% Nb doped SrTiO 3 (001) single crystals. The samples were both microscopically and macroscopically polarized using Piezoresponse Force Microscopy and electrochemical poling in an electrolyte respectively. In addition we demonstrate the possibility to retrieve a quasi-native mixed ferroelectric polarization state after annealing. These polarization methods may be applied to many other ferroelectric thin films

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

Endogenous dopamine transmission is crucial for motor skill recovery after stroke

Ischemic stroke frequently causes motor impairments. Despite exercise can improve motor outcomes, many stroke survivors remain life-long disabled. Understanding the mechanisms associated with motor recovery after a stroke is necessary to develop treatments. Here, we show that endogenous DA transmission is required for optimal motor skill recovery following photothrombotic stroke in rats. Blockade of dopamine D1 and D2 receptors impaired the recovery of a forelimb reaching task and decreased the rats' motivation to complete full training sessions. Our data indicate that dopamine transmission is important to drive motor rehabilitation after stroke through motivational aspects and ultimately suggest that augmented motivation and reward feedback could be an interesting strategy to increase the effectiveness or rehabilitation