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In order to meet the need of incomplete emergency case reasoning, an emergency case correspondence degree algorithm based on the rough similarity relationship was proposed. Firstly, the characteristics of emergency case was analyzed, and the define of rough similarity relationship was proposed; secondly, on the basic of analysis of the classic concept correspondence degree algorithm, the nearest ancestor node-based concept rough correspondence degree algorithm was proposed; thirdly, an emergency case correspondence degree algorithm based on rough similarity relationship was proposed; finally, an experiment was done to evaluate the algorithm, and the experiment results shown that it can effectively improve the case retrieval results.
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