%0 Journal Article
%T A Further Investigation of Characteristic Relation in Incomplete Information System<br>不完备信息系统中的特征关系进一步研究
%A YANG Xi-bei
%A YANG Jing-yu
%A WU Chen
%A YU Dong-jun
%A <br>杨习贝
%A 杨静宇
%A 吴 陈
%A 於东军
%J 系统工程理论与实践
%D 2007
%I 
%X 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.
%K incomplete information system
%K characteristic relation
%K compatible relation
%K complete covering
%K rough sets<br>不完备信息系统
%K 特征关系
%K 相容关系
%K 完全覆盖
%K 粗糙集
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=962324E222C1AC1D&jid=1D057D9E7CAD6BEE9FA97306E08E48D3&aid=595DD458F5EB5DC3&yid=A732AF04DDA03BB3&vid=DB817633AA4F79B9&iid=B31275AF3241DB2D&sid=7CE3F1F20DE6B307&eid=1B97AE5098AEB49C&journal_id=1000-6788&journal_name=系统工程理论与实践&referenced_num=0&reference_num=15