Espace et temps

Recommandation et analyse de sentiments dans un espace latent textuel

Recommender systems were developed to cherry-pick interesting content in an always growing environment to help users discover new products or information that they might like. Traditional collaborative filtering methods mainly focus on the ratings to establish user profiles, ignoring the joint review text. Our work does the opposite. We use the written comments as the primary source of informat...

Analysis and design of space-time block codes for coded MIMO transmissions. (Analyse et conception de code espace-temps en blocs pour transmissions MIMO codées)

Most of the modern wireless communication systems as WiMAX, DVB-NGH, WiFi, HSPA+, LTE and 4G have adopted the use of multiple antennas at the transmitter and the receiver, called multiple-input multiple-output (MIMO). Space time coding for MIMO systems is a promising technology to increase the data rate and enhance the reliability of wireless communications. The diversity-multiplexing tradeoff ...

Les temps du document et la recherche d'information

This article presents a survey of the interactions between information retrieval and temporal aspects of documents. First the time evoked by the discourse and the historic situation time of the documents themselves are distinguished. The universe of discourse time should be taken into account in the indexation step of information retrieval. It can be processed by named entities extraction and m...

Contributions à l'ordonnancement et l'analyse des systèmes temps réel critiques

Automates temporisés et systèmes multi-agents temps-réel

RÉSUMÉ. La conception de systèmes réactifs répond à des impératifs de correction logique (le système fait ce qu’il doit) et de correction temporelle (le système se conforme à un ensemble de contraintes temporelles). Nous proposons dans cet article une approche globale de conception de systèmes réactifs adaptatifs, c’est-à-dire adaptant dynamiquement leur architecture en fonction du contexte. Po...