%0 Journal Article
%T Research on Reduction Relationships of Nested Granularities<br>嵌套决策粒度约简关系的研究
%A LI Dao-Guo
%A MIAO Duo-Qian
%A ZHANG Nian-Qin
%A <br>李道国
%A 苗夺谦
%A 张年琴
%J 计算机科学
%D 2006
%I 
%X Knowledge Reduction plays an important role in knowledge discovery based on rough set theory.In this pa- per,therefore,the reduction relationships of nested granularities are theoretically analyzed in consistent information ta- bles.We educe and prove that relative core of coarser decision granularity must be a subset of relative core of finer deci- sion granularity.At the same time,a relative reduction of coarser decision granularity that satisfies consistency can be extended into a relative reduction of its finer decision granularity.Inversely,a relative reduction of finer decision granu- larity can also be cut back a relative reduction of its coarser decision granularity.The conclusions are helpful for knowl- edge reduction and knowledge discovery based on rough sets.
%K Relative core
%K Relative reduction
%K Inclusion degree
%K Information granular partition<br>相对D核
%K 相对D约简
%K 包容强度
%K 偏序关系
%K 粒划分
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=64A12D73428C8B8DBFB978D04DFEB3C1&aid=FF77F7BF168A6ECA&yid=37904DC365DD7266&vid=27746BCEEE58E9DC&iid=0B39A22176CE99FB&sid=4609832E4B5C797B&eid=7EBE588F611589FC&journal_id=1002-137X&journal_name=计算机科学&referenced_num=0&reference_num=6