Computer Science ›› 2017, Vol. 44 ›› Issue (1): 214-218.doi: 10.11896/j.issn.1002-137X.2017.01.041

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Query Expansion Method Based on Ontology and Local Co-occurrence

WANG Xu-yang and WEI Xing-xing   

  • Online:2018-11-13 Published:2018-11-13

Abstract: Combining the semantic expansion and the statistics expansion,a method of query expansion based on ontologyand local co-occurrence was proposed.The set of semantics candidate expansion concepts and the set of statistics candidate expansion concepts are respectively obtained by ontology and local co-occurrence.Then the final query expansion concepts are got by secondary filter.The method was presented to calculate the weight of expansion words.The results show that the query after expanding can reflect the user’s query better.In the design of semantic retrieval system,the method can effectively improve recall and precision.

Key words: Ontology,Local co-occurrence,Query expansion,Semantic retrieval

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