RÉSUMÉ. Ces dernières années, les besoins en termes de données et de services temps réel se sont beaucoup accrus dans un grand nombre d’applications. Traditionnellement, ces applications sont gérées par des systèmes temps réel, bien adaptés pour la prise en compte des contraintes temporelles. Cependant, ils ne sont pas satisfaisants pour la gestion efficace de grands volumes de données. Les sys...

We present the semi-conductor Boltzmann équation, which is time réversible, and mdicate that it can be formally derived by considermg the large time and small perturbmg potential limit m the Von-Neumann équation (time-réversible) We then rigorously compute the corresponding asymptotics in the case of the Von-Neumann équation on the Torus We show that the limit mg équation we obtam does not coïn...

With the advent of increasingly complex hardware in real-time embedded systems (processors with performance enhancing features such as pipelines, cache hierarchy, multiple cores), many processors now have a set-associative L2 cache. Thus, there is a need for considering cache hierarchies when validating the temporal behavior of real-time systems, in particular when estimating tasks’ worst-case ...

We formulate the question of existence of spatially periodic, time-periodic solutions for evolution equations as a fixed point problem, for certain temporal periods. We prove that if a certain estimate applies for the Duhamel integral, then time-periodic solutions cannot be arbitrarily small. This provides a partial analogue in the spatially periodic case of scattering results for dispersive eq...

The Bayesian Generalised Likelihood Uncertainty Estimation (GLUE) methodology, previously used in rainfall-runoff modelling, is applied to the distributed problem of predicting the space and time varying probabilities of inundation of all points on a flood plain. Probability estimates are based on conditioning predictions of Monte Carlo realizations of a distributed quasi-twodimensional flood r...

BACKGROUND The Temperament Evaluation Memphis, Pisa, Paris and San Diego Auto-questionnaire (TEMPS) is validated to assess temperament in clinical and non-clinical samples. Scores vary across bipolar disorder (BD), major depressive disorder (MDD), attention-deficit/hyperactivity disorder (ADHD), borderline personality disorder (BPD) and healthy controls (HCs), but a meta-analysis is missing. ...

RÉSUMÉ. Si dans la réalité nous ne pouvons que subir le temps, les simulations multi-agents nous permettent de l’utiliser comme moteur d’évolution sur des modèles réduits afin d’en déduire des nouvelles connaissances sur le monde réel. Aussi, la façon dont le temps virtuel est géré par le simulateur joue un rôle prédominant sur le potentiel de ce dernier. Dans cet article nous passons en revue ...

We analyze the notions of monotonicity and complete monotonicity for Markov Chains in continuous-time, taking values in a finite partially ordered set. Similarly to what happens in discrete-time, the two notions are not equivalent. However, we show that there are partially ordered sets for which monotonicity and complete monotonicity coincide in continuous time but not in discrete-time. To cite...

The Discontinuous Galerkin Time Domain (DGTD) methods are now widely used for the solution of wave propagation problems. Able to deal with unstructured meshes past complex geometries, they remain fully explicit with easy parallelization and extension to high orders of accuracy. Still, modal or nodal local basis functions have to be chosen carefully to obtain actual numerical accuracy. Concernin...

An attractive feature of discontinuous Galerkin (DG) spatial discretization is the possibility of using locally refined space grids to handle geometrical details. However, locally refined meshes lead to severe stability constraints on explicit integration methods to numerically solve a time-dependent partial differential equation. If the ratio of fine to coarse elements is small, the time step ...