Opérateurs de type Fourier–Grassmann sur1UGLn(2q)

Opérateurs D'amélioration

We introduce a new class of change operators. They are a generalization of usual iterated belief revision operators. The idea is to relax the success property, so the new information is not necessarily believed after the improvement. But its plausibility has increased in the epistemic state. So, iterating the process sufficiently many times, the new information will be finally believed. We give...

A propos de la sémantique de divers opérateurs de division de relations

This paper is concerned with flexible queries addressed to regular relational databases whose main goal is to overcome some of the limitations of Boolean queries. Introducing preferences inside selection conditions allows for the discrimination between more or less satisfactory answers according to the preferences appearing in the query. The operation known as the relational division whose inte...

Généralisation des opérateurs de dérivation de Galois en recherche d'information basée sur l'analyse formelle de concepts

RÉSUMÉ. La recherche d’information basée sur l’analyse formelle de concepts repose généralement sur l’utilisation de la structure de treillis des concepts formels. Les noeuds de ce treillis (i.e. les concepts formels) peuvent être interprétés comme des paires 〈réponse,requête〉. A ce jour, la quasi-majorité des travaux existant en ce sens utilisent l’opérateur de dérivation de Galois classique (...

Extraction de sous-ontologies autonomes par fermeture des opérateurs hyponymie et hyperonymie

Facing the exponentially increasing amount of data, new challenges consist in retrieving the good information at the right time, organizing and filtering data, visualizing them and using them in a specific decision context. For a decade, ontologies have been successfully used as semantic guides for these tasks. Nevertheless the size of ontologies that are shared and accepted as standards in a g...

Etude serologique comparée de différentes souches de virus aphteux de type A isolées au Moyen-Orient et en Europe