Assessing Automatically Extracted Bilingual Lexicons for CLIR in Vertical Domains: XRCE Participation in the GIRT Track of CLEF 2002

In this paper, we describe the approach we used in the Cross-Language Evaluation Forum CLEF 2002, and more specifically in the GIRT Task. The approach is based on (1) the extraction of two bilingual lexicons, one from parallel corpora and the other one from comparable corpora, (2) the optimal combination of these bilingual lexicons for Cross-Language Information Retrieval and (3) the combination with monolingual IR on parallel corpora. While our original submission to CLEF2002 was restricted to short queries (using only the title field), we present here the results extended to complete queries.

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