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Improvement of Existing Expand-based Approaches for Construction of Lexical Ontologies with Bi-lingual Dictionaries

Seraj, Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41754 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Abolhassani, Hassan
  7. Abstract:
  8. Nowadays the importance of ontologies in various domains such as semantic web and NLP is obvious. Manually construction of ontologies is a time-consuming, costly and error prone. The non-manual building of ontologies approaches are divided to the expand approach and the merge approach, each has pros and cons. The expand approach is preferred upon the merge approach for languages with few lingual resources. The most important thing in the expand approach, which is building an ontology from another existing ontology, is making distinction between the different meanings of polysemous words. This activity is called word sense disambiguation(WSD). The existing approaches usually give attention to the monosemous words and also making intersection between the words in a synset(synonym set).In this thesis we extended the existing approaches, to improve their results: to disambiguate more words, and to find translations for more synsets. To accomplish this aim, we have presented various approaches, like using an aligned ontology of a third language as an interface between the two languages. Our approaches have improved the previous approaches more than 30 percent in respect to F-Measure.
  9. Keywords:
  10. Ontology ; Alignment ; Wordnet ; Word Sense Disambiguation (WSD) ; Non-Manual Construction of Ontologies ; Expand Approach ; Antology Mapping

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