摘要
改进了基于非对称相似关系的粗集的上、下近似的定义,并从理论上证明了新定义的上、下近似比原来的更合理,并进一步用一个算例来验证。
The paper gives an improved definition of the upper approximation and lower approxi marion of rough set based on nonsymmetric similar relation, proves in theory that the improved definition is better than the orginal and finally illustrates by an examle.
出处
《唐山学院学报》
2007年第2期3-4,共2页
Journal of Tangshan University
关键词
非对称相似关系
粗集
上近似
下近似
不完备信息系统
nonsysmmetric similar relation
rough set
upper approximation
lower approximation
incomplete information system
