Abstract
Expressing knowledge by ontology is favorable for reuse and reasoning of knowledge. The structure of domain ontology for question answering system (QA) was formally defined, and the relations between ontology elements and semantic analysis of question and answer extraction were illustrated. The method of reusing Chinese ontology was proposed in the same domain, and the method can construct new initial ontology after extracting and classifying new instances based on the existing ontology using support vector machine (SVM) and reuse the other elements of the existing ontology. By the experiment of ontology reuse in certain medical domain, the average F-value of extraction and classification of instances reached 82.8%, and it verified validity of the method. The proposed method has significance for fast constructing Chinese ontology for QA in same domain.
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