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中文摘要：
为了从不完备决策信息系统中获取否定决策规则,首次提出了基于相似关系的不相似知识颗粒的概念,研究了如何通过不相似知识粒获取否定决策规则的方法,给出了知识约简的启发式算法,并进行了实例分析,为从不完备信息系统中获取知识提供了新的理论基础与操作手段.
英文摘要：
To derive the negative rules from the incomplete decision information system,the concept of dissimilarity knowledge granule based on similarity relation is firstly proposed.Moreover,the approach to acquire the certain and uncertain negative rules is presented,and heuristic algorithm of the attribute reduction based on the significant attributes is introduced.Finally,an illustrative example is analyzed.These results are meaningful both in the theory and applications for rules＇ acquisition in incomplete decision systems.
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