Agrégation des résultats dans les systèmes de recherche d’information pair-à-pair non structurés

Abstract : A huge part of the impetus of various internet technologies through the Peer-to-Peer (Peer-to-Peer or P2P) system can be seen as a reaction to the content centering detriment on the servers in front of passive clients. One of the distinctive features of any P2P system is what we often call direct connectivity between equal peers. The Peer-to-Peer increased the exchange flows between dynamic communities of users which tend to grow rapidly. We talk, therefore, about large-scale distributed systems in which the exchanged, shared and sought information reaches a more and more impressive volumes. Solving the aggregation problem in P2PIR systems the same way as its resolution in Distributed Information Retrieval (DIR) will miss a lot of intelligibility. In fact, the context has changed in RIP2P, given the scale factor and the lack of a global vision of the system in these networks that extend naturally to thousands or even millions peers. This will involve the removal of a broker server that is inadequate in this context and will raise the problem of finding new policies to aggregate results coming from heterogeneous peers in a single list while reflecting the user’s expectations. All these reasons prompted us to explore an aggregation mechanism based on user profiles deduced from their past behavior due to their interaction with query results. Our contributions, in this thesis, focus on two complementary axes. First, we propose a new vision of results aggregation in a large scale system. In this context, a profiles model and a hybrid score profiles-based approach are proposed. Second, we focused on the development of an evaluation framework of our approach in large-scale systems. In this thesis, we are mainly interested in the Information Retrieval problem in P2P systems (P2PIR) and focusing more specifically on the problem of results’ aggregation in such systems
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Rim Mghirbi. Agrégation des résultats dans les systèmes de recherche d’information pair-à-pair non structurés. Réseaux et télécommunications [cs.NI]. Institut National des Télécommunications; Université de Tunis El-Manar. Faculté des Sciences de Tunis (Tunisie), 2013. Français. ⟨NNT : 2013TELE0003⟩. ⟨tel-01172606⟩



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