Abstract
Traditional retrieval strategy based on-matching is facing unavoidable bottleneck because of mechanical characters matching and polysemy problems.A retrieval strategy based on domain ontology and semantic expansion of keywords was proposed.On the one hand,the domain ontology concept structure was used to expand the retrieval area;on the other hand,a method was presented to filter the irrelevant results.In this way,both the recall ratio and the precision ratio could be improved simultaneously.After that,an algorithm of sorting the retrieval results by the similarity between ontology and result was given.
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