Dissertation physico-mathématique sur les roulements du cercle

Notes sur les Ixodidés du genre Hyalomma (Koch)

Les inscriptions du temps sur les cadrans solaires

Analyse mathématique du tri du couvain par les fourmis : auto-organisation fonctionnelle dénuée d'intelligence collective

Brood sorting, observed in some ant colonies, is a major example of social insects ability to solve problems at the collective level. Two processes characterize this phenomenon : a process of aggregation of all brood items in a single cluster, coupled with a process of segregation of items in concentric annuli, each containing items of different type. The mechanism of brood sorting, though it h...

Interrogation de données multimédia fondée sur les connaissances du domaine

In this paper, we present a domain knowledge based approach to retrieve multimedia data described by using the MPEG-7 standard. This standard is used since it provides tools to represent, in the same description, the structural and semantic aspects of the multimedia content. However, due to its XML schema based definition, MPEG-7 lacks ability to describe implicit information and to integrate d...

Sur les sous-groupes nilpotents du groupe de Cremona

We describe the nilpotent subgroups of the group Bir(P(C)) of birational transformations of the complex projective plane. Let N be a nilpotent subgroup of class k > 1; then either each element of N has finite order, or N is virtually metabelian.