不完备信息系统中的特征关系进一步研究  

A Further Investigation of Characteristic Relation in Incomplete Information System

作　　者：杨习贝[1] 杨静宇[1] 吴陈[2] 於东军[1] 

机构地区：[1]南京理工大学计算机科学与技术学院,南京210094 [2]德瑞索大学信息科学与技术学院,费城pa19104

出　　处：《系统工程理论与实践》2007年第6期155-160,共6页Systems Engineering-Theory & Practice

基　　金：国家自然科学基金(60472060;60572034);南京理工大学科研发展基金(AB96125)

摘　　要：以同时具有遗漏型和丢失型未知属性值的不完备信息系统为研究对象,深入分析了其中的特征关系并讨论了特征类中的两种不合理情形,进而提出了一种新的特征关系.根据新建立的特征关系,构建了论域上的完全覆盖,形成了两种不同类型的知识表达系统,并进行了一些重要性质的研究.最后用一实例分析以验证新的特征关系的有效性.In this paper, the research object is the incomplete information system in which ＂do not care＂ and lost unknown attribute values are coexisting. In this kind of incomplete information system, the characteristic relation is deeply investigated and then two unreasonable situations in characteristic class are discussed. Based on this, a new kind of characteristic relation is proposed. From what have been discussed above, the complete covering on universe is constructed based on the new-defined characteristic relation. Furthermore, two different kinds of knowledge representation system are formed, some important properties of them are investigated. Finally, an illustrative example is analyzed bv new-defined characteristic relation to exolain it＇s validity.

关 键 词：不完备信息系统 特征关系 相容关系 完全覆盖 粗糙集 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]