Espaces vectoriels sémantiques : enrichissement et interprétation de requêtes dans un système d'information distribué et hétérogène

Anthony Ventresque 1
1 ATLAS - Complex data management in distributed systems
UN - Université de Nantes, Inria Rennes – Bretagne Atlantique
Abstract : Information systems face a relevance problem in retrieval due to the huge increase of available data. Moreover, the number of networking devices grows up and jeopardizes the client/server architecture model. A new architecture is then emerging: peer-to-peer networks (P2P). But they are greedy in network resources (queries flood the network) and offer limited functionalities (key word search). In both fields, IR and P2P systems, research are going deeper on the use of semantics. In computer science, semantics based approaches generally relies on the definition of ontologies. Huge and distributed development of ontologies leads to a semantic heterogeneity. A classical solution relies on the use of mappings between parts of two ontologies. But this solution is difficult to obtain and not always complete. Unshared parts of two ontologies are often not managed, which leads to a loss of information. Our solution, EXSI2D, uses a special query expansion, called structuring expansion, on query initiator's side. Then she can specify the dimensions of her query without any modification of the query itself. Information provider is also allowed to interpret the structuring expansion within her own ontologies. Thus each participant of a semantic heterogeneous information system is able to use all her ontology, including the unshared parts. We also present a solution to the use of EXSI2D in a P2P system, thanks to SPARTANBFS, a “frugal”protocol for unstructured P2P systems.
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Anthony Ventresque. Espaces vectoriels sémantiques : enrichissement et interprétation de requêtes dans un système d'information distribué et hétérogène. Informatique [cs]. Université de Nantes, 2008. Français. ⟨tel-00457820⟩

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