Chinese OOV translation and post-translation query expansion in chinese--english cross-lingual information retrieval

Authors:
Ying Zhang;Phil Vines;Justin Zobel
Affiliations:
School of Computer Science and Information Technology, RMIT University, Melbourne, Australia;School of Computer Science and Information Technology, RMIT University, Melbourne, Australia;School of Computer Science and Information Technology, RMIT University, Melbourne, Australia
Venue:
ACM Transactions on Asian Language Information Processing (TALIP)
Year:
2005

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Abstract

Cross-lingual information retrieval allows users to query mixed-language collections or to probe for documents written in an unfamiliar language. A major difficulty for cross-lingual information retrieval is the detection and translation of out-of-vocabulary (OOV) terms; for OOV terms in Chinese, another difficulty is segmentation. At NTCIR-4, we explored methods for translation and disambiguation for OOV terms when using a Chinese query on an English collection. We have developed a new segmentation-free technique for automatic translation of Chinese OOV terms using the web. We have also investigated the effects of distance factor and window size when using a hidden Markov model to provide disambiguation. Our experiments show these methods significantly improve effectiveness; in conjunction with our post-translation query expansion technique, effectiveness approaches that of monolingual retrieval.