Worst case and average case cardinality of strictly acute stencils for two dimensional anisotropic fast marching

We study a one dimensional approximation-like problem arising in the discretization of a class of Partial Differential Equations, providing worst case and average case complexity results. The analysis is based on the Stern-Brocot tree of rationals, and on a non-Euclidean notion of angles. The presented results generalize and improve on earlier work

Generalized fast marching method for computing highest threatening trajectories with curvature constraints and detection ambiguities in distance and radial speed

Work presented at the 9th Conference on Curves and Surfaces, 2018, ArcachonWe present a recent numerical method devoted to computing curves that globally minimize an energy featuring both a data driven term, and a second order curvature penalizing term. Applications to image segmentation are discussed. We then describe in detail recent progress on radar network configuration, in which the optimal curves represent an opponent's trajectories

Generalized fast marching method for computing highest threatening trajectories with curvature constraints and detection ambiguities in distance and radial speed

Work presented at the 9th Conference on Curves and Surfaces, 2018, ArcachonWe present a recent numerical method devoted to computing curves that globally minimize an energy featuring both a data driven term, and a second order curvature penalizing term. Applications to image segmentation are discussed. We then describe in detail recent progress on radar network configuration, in which the optimal curves represent an opponent's trajectories

Massively parallel computation of globally optimal shortest paths with curvature penalization

We address the computation of paths globally minimizing an energy involving their curvature, with given endpoints and tangents at these endpoints, according to models known as the Reeds-Shepp car (reversible or forward only), the Euler-Mumford elasticae, and the Dubins car. For that purpose, we numerically solve degenerate variants of the eikonal equation, on a three dimensional domain, in a massively manner on a graphical processing unit. Due to the high anisotropy and non-linearity of the addressed PDE, the discretization stencil is rather wide, has numerous elements, and is costly to generate, which leads to subtle compromises between computational cost, memory usage, and cache coherency.Accelerations by a factor 30 to 120 are obtained w.r.t a sequential implementation.The efficiency and robustness of the method is illustrated in various contexts, ranging from motion planning to vessel segmentation and radar configuration

Sur l’impact des pesticides, la recherche scientifique doit éclairer la décision publique

L’appel à projets annoncé par le gouvernement le 9 mai ne suffira pas à couvrir l’ensemble des problématiques liées à l’utilisation des pesticides, déplore un collectif de près de 260 scientifiques, qui prônent une gestion plus ambitieuse « au nom du bien commun »

Avis en réponse à la saisine du 7 novembre 2013, de Madame Marie-Christine Blandin, relative à l’article de Snell et al. (Food and Chemical Toxicology, 2012)

Le Haut Conseil des biotechnologies (HCB) a été saisi le 7 novembre 2013 par Madame la Sénatrice Marie-Christine Blandin, en vertu de l’article L531-3 du code de l’environnement, d’une demande d’avis relative à l’article de Snell et al., intitulé «Assessment of the health impact of GM plant diets in long-term and multigenerational animal feeding trials: A literature review», publié dans la revue Food and Chemical Toxicology (Snellet al.,2012). Pour répondre aux questions de la saisine, le Comité Scientifique (CS) du HCB a constitué un groupe de travail ad hoc. A la suite du compte-rendu de ce dernier, le CS du HCB a procédé à l’examen du projet de réponse le 25 février 2014 sous la présidence de Jean-Christophe Pagès

Avis concernant les recommandations du Comité de surveillance biologique du territoire relatives à la surveillance des PGM

Conformément au code de l’environnement, le Haut Conseil des biotechnologies (HCB) a été consulté par le Comité de surveillance biologique du territoire (CSBT), le 4 avril 2012, sur les protocoles et méthodologies d’observation qu’il a proposés pour la mise en œuvre de la surveillance biologique du territoire relative à laculture de PGM. Le Comité scientifique (CS) du HCB a procédé à l’examen du dossier le 11 septembre 2012 sous la présidence de Jean-Christophe Pagès