REINA at CLEF 2009 Robust-WSD Task: Partial Use of WSD Information for Retrieval

3908 2 200 1 474 document 200 zazo-paperCLEF2009.pdf application/pdf 2378a302045428016af63b0d15ef07ce MD5 99419 2012-12-14 17:40:55 https://eprints.rclis.org/3908/1/zazo-paperCLEF2009.pdf 3908 1 1 application/pdf en public

zazo-paperCLEF2009.pdf

198551 2 205112 document 198551 lightbox.jpg image/png 617dffaf6fab1f6849bc11792d81dce5 MD5 51124 2012-12-21 16:41:04 https://eprints.rclis.org/3908/7/lightbox.jpg 3908 7 7 image/png other Thumbnails conversion from application/pdf to thumbnail_lightbox en public

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http://eprints.org/relation/isVersionOf https://eprints.rclis.org/id/document/200 http://eprints.org/relation/isVolatileVersionOf https://eprints.rclis.org/id/document/200 http://eprints.org/relation/isIndexCodesVersionOf https://eprints.rclis.org/id/document/200 archive 6828 disk0/00/00/39/08 2010-02-15 2014-10-02 11:56:43 2012-12-14 17:40:54 confpaper show Zazo Ángel F. G.-Figuerola Carlos Alonso-Berrocal José-Luis Gómez-Díaz Raquel REINA at CLEF 2009 Robust-WSD Task: Partial Use of WSD Information for Retrieval pub LM LL Indexing methods, Thesauruses; Information Search and Retrieval, Query formulation; Machine Translation, Word Sense Disambiguation, Tesauros, recuperación de información, reformulación de consultas, traducción automática, desambiguación semántica This paper describes the participation of the REINA research group at CLEF 2009 Robust-WSD Task. We have participated in both monolingual and bilingual subtasks. In past editions of the robust task our research group obtained very good results for non-WSD experiments applying local query expansion using co-occurrence based thesauri constructed using windows of terms. We applied it again. For WSD experiments, our intention was to use the WSD information and WordNet for expansion, but we did not have time to use them. We only used the lemma proposed by the POS tagger of the WSD collection as a stemmer. In bilingual retrieval experiments, two on-line machine translation programs were used to translate topics, and translations were merged before performing a monolingual retrieval. We also applied the same local expansion technique. Our non-WSD runs obtained the top rank considering the GMAP measure (monolingual and bilingual subtasks). However, regarding expansion we viewed that the settings tuned for a system not always produces retrieval improvement when the conditions change: number of query terms, query language, document or query subject, linguistic approach, etc. Our WSD runs also obtained very good positions in the rankings even thought we only used partial WSD information. However, in comparison with non-WSD runs the retrieval performance made worse. We detected some homonym errors in the POS tagger and probably these errors are worse than the errors carried out by the Porter stemmer used in the non-WSD experiments. 2009 30 september - 2 october CLEF 2009 Workshop Corfu, Greece en FALSE ES- http://hdl.handle.net/10760/3908 public FALSE Peters C. Borri F. Nardi A. info:eu-repo/semantics/other