Université de Sherbrooke

About: Université de Sherbrooke is a education organization based out in Sherbrooke, Quebec, Canada. It is known for research contribution in the topics: Population & Receptor. The organization has 14922 authors who have published 28783 publications receiving 792511 citations. The organization is also known as: Universite de Sherbrooke & Sherbrooke University.

Enhanced robot audition based on microphone array source separation with post-filter

Abstract: We propose a system that gives a mobile robot the ability to separate simultaneous sound sources. A microphone array is used along with a real-time dedicated implementation of geometric source separation and a post-filter that gives us a further reduction of interferences from other sources. We present results and comparisons for separation of multiple non-stationary speech sources combined with noise sources. The main advantage of our approach for mobile robots resides in the fact that both the frequency domain geometric source separation algorithm and the post-filter are able to adapt rapidly to new sources and non-stationarity. Separation results are presented for three simultaneous interfering speakers in the presence of noise. A reduction of log spectral distortion (LSD) and increase of signal-to-noise ratio (SNR) of approximately 10 dB and 14 dB are observed.

Validation de la version française du CTQ et prévalence de l’histoire de maltraitance

Abstract: Cette etude demontre que les cinq echelles de maltraitance des versions longue et courte du CTQ sont valides et utilisables avec la population francophone. Elle montre aussi que la negligence emotionnelle est la forme de maltraitance la plus frequente dans notre echantillon de la population generale, alors que la negligence physique est celle qui est la moins frequente. Les prevalences d’abus physique, d’abus emotionnel et d’abus sexuel de notre echantillon de convenance correspondent grosso modo aux taux generalement obtenus aupres d’echantillons non cliniques. Enfin, les femmes presentent une plus forte co-occurrence des differentes formes de maltraitance que les hommes, impliquant tout particulierement l’abus sexuel.

Cellular prion protein neuroprotective function: implications in prion diseases

Abstract: Prion protein can display two conformations: a normal cellular conformation (PrP) and a pathological conformation associated with prion diseases (PrPSc). Three complementary strategies are used by researchers investigating how PrP is involved in the pathogenesis of prion diseases: elucidation of the normal function of PrP, determination of how PrPSc is toxic to neurons, and unraveling the mechanism for the conversion of PrP to PrPSc. We review the normal function of PrP as an antioxidant and an antiapoptotic protein in vivo and in vitro. This review also addresses contrasting evidence that PrP is cytotoxic. Finally, we discuss the implication of the neuroprotective role of PrP in prion diseases.

The viscosity of aqueous solutions of alkali and tetraalkylammonium halides at 25°C

Abstract: The viscosities of most alkali and tetraalkylammonium halides have been measured in water at 25°C. The relative viscosities can be fitted, up to 1M, with the relationηr=1+Aηc1/2+Bηc+Dη2. TheAη term depends on long-range coulombic forces, andBη is a function of the size and hydration of the solute. When combined with partial-molal-volume data, the difference Bη−0.0025V° is mostly a measure of the solute-solvent interactions. IonicBη are obtained if the tetraethylammonium ion is assumed to obey Einstein's law. TheDη parameter depends on higher terms of the long-range coulombic forces, on higher terms of the hydrodynamic effect, and on structural solute-solute interactions. As such, it cannot be interpreted unambiguously.