改进的粗糙集属性重要度  

Improved attribute significance degree based on rough set

作　　者：肖劲森[1] 孙立民[1] XIAO Jinsen;SUN Limin(School of Sciences, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China)

机构地区：[1]广东石油化工学院理学院,广东茂名525000

出　　处：《计算机工程与应用》2017年第3期174-176,210,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(No.11426070);广东省青年创新人才项目(No.2014KQNCX202);广东省普通高校特色创新项目(No.2014KTSCX167)

摘　　要：粗糙集理论知识库的属性重要度,体现的是去掉某个或某些属性前后的知识库分类变化的程度。对现有粗糙集理论的属性重要度确立方法的不足,充分考虑条件属性对决策的直接和间接的影响,提出一种新的基于粗糙集属性依赖度的属性重要度确定方法。此外,针对原有属性重要度与改进重要度的差别,讨论改进的属性重要度的意义,并证明改进的属性重要度更加可信。最后,利用改进的方法对机械故障属性重要度进行仿真;对比原有属性重要度的数据,改进方法获得的数据不但更符合属性约简结果,并且具有更大区分度,十分有利于决策者快速做出判断。The attribute significance degree based on the knowledge base of rough sets shows the classification change afterremoving one or more attributes.For the inadequacy of the method to determine the attribute significance degree,thedirect and indirect effects of the condition attributes acted on the decision attributes are considered,and the method to determinethe attribute significance degree,which is based on the attribute dependency degree in rough sets,is improved.Moreover,after comparing the difference between the original and the improved method,the meaning of the later is discussed,and theorems show that the improved method is more credible.Finally,the simulation on the attribute significancedegree of mechanical faults shows that the attribute significance degrees are more distinguishable and suitable for the attributereduction,which are beneficial to decision-makers’quick judgments.

关 键 词：粗糙集 属性重要度 故障诊断 属性约简 决策 

分 类 号：TP182[自动化与计算机技术—控制理论与控制工程] O189[自动化与计算机技术—控制科学与工程]