The PUCRS-PLN Group participation at CLEF 2006
Marco González, Vera Lúcia Strube de Lima · 2006
This paper presents the 2006 participation of the PUCRS-PLN Group in CLEF Monolingual Ad Hoc Task for Portuguese. We participated with the TR+ Model based on nominalization, binary lexical relations (BLR), Boolean queries, and the evidence concept. Our alternative strategy for lexical normalization, the nominalization, is the transformation of a word (adjective, verb, or ad-verb) into a semantically corresponding noun. BLRs, which identify relationships between nominal-ized terms, capture phrasal cohesion mechanisms, like those that occur between subject and predi-cate, subject and object (direct or indirect), noun and adjective or verb and adverb. In our strategy, an index unit may be a single term or a BLR, and we adopt the evidence concept, i.e., the index unit weighting depends on the occurrence of phrasal cohesion mechanisms, besides the frequency of oc-currence. We detail here these features, which implement lexical normalization and term depend-ence in an information retrieval system.