A Further Investigation of Characteristic Relation in Incomplete Information System
不完备信息系统中的特征关系进一步研究

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 by new-defined characteristic relation to explain it's validity.