In three-dimensional (3D) blood flow simulations, lumped parameter models (0D) are often used to model the neglected parts of the downstream circulatory system. We analyze two 3D-0D coupling approaches in which a fractional-step projection scheme is used in the fluid. Our analysis shows that explicit approaches might yield numerical instabilities, particularly in the case of realistic geometrie...

In this paper, we extend traditional methods of spatial statistics to study spatiotemporal correlations between two different point processes. After introducing the methodology, we apply this analysis to a particular case study of interest in ecology, the interaction between damage by a particular forest pest (western spruce budworm (Choristoneura occidentalis)) and forest fires. Our analysis, ...

– La science réglementaire a été recadrée afin d'évaluer les risques que compor-tent les cultures génétiquement modifiées sur le plan écologique tant aux Etats-Unis qu'en Europe. Alors que se déchaînent des conflits de nature réglementaire de part et d'autre de l'Atlantique, le maïs 'insecticide' Bt fait figure d'étude de cas dans le cadre de deux problèmes de portée générale: comment les opini...

CIRANO is a private non-profit organization incorporated under the Québec Companies Act. Its infrastructure and research activities are funded through fees paid by member organizations, an infrastructure grant from the Ministère de l’Industrie, du Commerce, de la Science et de la Technologie, and grants and research mandates obtained by its research teams. The Scientific Series fulfils one of t...

The sense of feeling can effectively be used to enforce virtual artistic activities like virtual sculpting or modeling. In this paper, we describe how a virtual sculpture system has been extended with haptical feedback. In practice, we use the scalar field defining the implicit surface being modeled to efficiently compute several type of force feedback. We present a method for combining these f...

This Note presents original rates of convergence for the deconvolution problem. We assume that both the estimated density and noise density are supersmooth and we compute the risk for two kinds of estimators. Résumé Vitesses de convergence en déconvolution nonparamétrique. Cette Note présente des vitesses de convergence originales pour le problème de déconvolution. On suppose que la densité est...

In recent years, the eld of active contour based image segmentation has seen the emergence of two competing approaches. The rst and oldest approach represents active contours in an explicit (or parametric) manner corresponding to the Lagrangian formulation. The second approach represents active contours in an implicit manner corresponding to the Eulerian framework. After comparing these two app...

We study two enumeration problems for up-down alternating trees, i.e., rooted labelled trees T , where the labels v1, v2, v3, . . . on every path starting at the root of T satisfy v1 < v2 > v3 < v4 > · · · . First we consider various tree families of interest in combinatorics (such as unordered, ordered, d-ary and Motzkin trees) and study the number Tn of different up-down alternating labelled ...

We describe a set of modular extensions to our Auto/Graph veriication toolset for networks of communicating processes. These software additions operate from a common le exchange format for automata and networks, called fc2. Tool functionalities comprise graphical depiction of objects, global model construction from hierarchical descriptions, varr ious types of model reductions and of veriicatio...

{ We describe a transform for locally reened wavelet bases which employs the cardinal Lagrange function instead of the scaling function. This construction is extended to biorthogonal vaguelettes into which a diierential operator is incorporated. The approach is relevant for the solution of nonlinear parabolic PDEs by an explicit or semi{ implicit time scheme when the nonlinear term is evaluated...