Merging Case Relations into VSM to Improve Information Retrieval Precision

  • Wang Hongtao
  • Sun Maosong
  • Liu Shaoming
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3406)


This paper presents an approach that merges case relations into the well-known Vector Space Model (VSM), leading to a new model named C-VSM (Case relation-based VSM). A Chinese case system with 23 case relations is established, and a Chinese Olympic news corpus of 7,662 sentences, denoted COCS, is constructed by manual annotation with these 23 case relations. We use 50 queries on COCS as a test set. Experimental results on the test set show that C-VSM outperforms W-VSM (Word-based VSM) by 3.4% on the average 11-point precision. It is worth pointing out that almost all the previous studies on semantic IR obtained no better, even worse, results than W-VSM, our work thus validates the usefulness of case relations in IR through the validation is still preliminary. The proposed model is believed to be language-independent.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Wang Hongtao
    • 1
  • Sun Maosong
    • 1
  • Liu Shaoming
    • 2
  1. 1.The State Key Laboratory of Intelligent Technology and Systems, Department of Computer Science and TechnologyTsinghua UniversityBeijingChina
  2. 2.Future Technology InstituteFuji Xerox Co. LtdJapan

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