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相似事例检索算法是计算机辅助复合材料成型工艺设计中的关键技术。研究了事例推理机制,给出了基于粗糙集理论的事例推理流程,对相似事例算法进行改进,采用粗糙集理论中属性重要性对事例索引属性进行约简,约简掉对检索结果影响较小的属性,并采用粗糙集属性重要性理论确定索引属性的权值。研究了索引属性中数值类型和集合类型的相似性计算算法,最后通过实例对算法进行验证,结果表明该算法提高了事例检索的速度和正确性。
A similar case retrieval algorithm is the key technology in the design of computer aided composite molding process. Case-based reasoning mechanism is studied. The case-based reasoning process based on rough set theory is given. The algorithm of similar case is improved. The attribute importance of the rough set theory is used to reduce the case index attributes. The reduction has little effect on the search results The attribute of rough set attribute is used to determine the weight of index attribute. The algorithm of similarity calculation between numerical types and set types in indexed properties is studied. Finally, an example is given to validate the algorithm. The results show that the algorithm improves the speed and correctness of case retrieval.