集值信息系统基于优势关系下的知识约简

在集值信息系统中,把所有属性看成是一种准则,然后利用属性集值的取值分布定义了两种不同的优势关系,它们都是经典信息系统上优势关系的推广.针对这两种优势关系,给出了集值信息系统的知识约简与对象的相对约简的判定,定义了基于区分矩阵的区分函数,并利用布尔推理方法得到了这两种优势关系下的知识约简与对象的相对约简的具体操作方法.

Knowledge Reduction of Set-valued Information Systems Based on Dominance Relation

We proposed two different types of dominance relations in set-valued information systems by the distribution of set-valued when all attributes were considered as criterions, and generalized the dominance relations in classical information systems. The judgment of knowledge reduction and relative reduction of each object were studied for two types of dominance relations in set valued information systems, from which we defined discernibility function based on discernibility matrix, and got approach computing knowledge reduction and relative reduction of each object.