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Publications scientifiques

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High fidelity numerical simulation of 3d arc extinction in a high voltage circuit breaker

...----------AbstractThis research aims at 3D numerical simulation of arc inside an SF6 high voltage circuit breakerat current zero. With the goal of capturing and quantifying the arc 3D instabilities at currentzero, FVM is used to solve real-gas-modified Euler equations. A Weighted Essentially Non-Oscillatory (WENO) method is employed to reach a 5th order spatial accuracy for a betterunderstanding of complex phenomena involved in the arc simulation. The ohmic heating issolved using a 4th order compact finite difference method and the radiative energy transfer ismodelled via P1 method. A 3rd order TVD Runge-Kutta integration method is implementedto represent the solver evolution in time....

général - core.ac.uk -

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Modélisation procédurale par composants

...The realism of computer graphics images requires the creation of objects (or scenes) of increasing complexity, which leads to considerable costs. Procedural modeling can help to automate the creation process, to simplify the modification process or to generate multiple variations of an object instance. However although several procedural methods exist, no single method allows the creation of all types of complex objects, including in particular a complete building. This thesis proposes two solutions to the problem of procedural modeling: one solution addressing the geometry level, and the other introducing a general system suitable for complex object modeling....

général - core.ac.uk -

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New postcranial bones of elasmotherium peii from shanshenmiaozui in nihewan basin, northern china

...Elasmotherium or the Giant Siberian Unicorn is quite common in Siberia and adjacent regions during the Quaternary Period, but it only appeared in very few sites of Early Pleistocene age in northern China. In the past century, quite a number of specimens of Elasmotherium were recovered in Nihewan Basin, most of which are disarticulated postcranial bones, among which the tibia was absent. Recently, not only dental materials, but also a nearly complete tibia and other podial as well as metapodial bones of Elasmotherium were recovered in Nihewan Basin....

recherche et propriété intellectuelle - core.ac.uk -

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Pour la caractérisation et la classification des images tep-fdg : application du diagnostic assisté par ordinateur de la maladie d'alzheimer

...Alzheimer's disease (AD) is becoming the dominant type of neurodegenerative brain disease in elderly people, which is incurable and irreversible for now. It is expected to diagnose its early stage, Mild Cognitive Impairment (MCI), then interventions can be applied to delay the onset. Fluorodeoxyglucose positron emission tomography (FDG-PET) is considered as a significant and effective modality to diagnose AD and the corresponding early phase since it can capture metabolic changes in the brain thereby indicating abnormal regions. Therefore, this thesis is devoted to identify AD from Normal Control (NC) and predict MCI conversion under FDG-PET modality. For this purpose, three independent novel methods are proposed. The first method focuses on developing connectivities among anatomical regions involved in FDG-PET images which are rarely addressed in previous methods. Such connectivities are represented by either similarities or graph measures among regions. Then combined with each region's properties, these features are fed into a designed ensemble classification framework to tackle problems of AD diagnosis and MCI conversion prediction. The second method investigates features to characterize FDG-PET images from the view of spatial gradients, which can link the commonly used features, voxel-wise and region-wise features. The spatial gradient is quantified by a 2D histogram of orientation and expressed in a multiscale manner. The results are given by integrating different scales of spatial gradients within different regions. The third method applies Convolutional Neural Network (CNN) techniques to three views of FDG-PET data, thereby designing the main multiview CNN architecture....

général - core.ac.uk -

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