• 中国计算机学会会刊
  • 中国科技核心期刊
  • 中文核心期刊

J4 ›› 2010, Vol. 32 ›› Issue (5): 97-99.doi: 10.3969/j.issn.1007130X.2010.

• 论文 • 上一篇    下一篇

粗糙集信息观中的绝对约简

陈凤娟,孙静   

  1. (辽宁对外经贸学院信息技术系,辽宁 大连 116052)
  • 收稿日期:2009-11-15 修回日期:2010-02-09 出版日期:2010-04-28 发布日期:2010-05-11
  • 通讯作者: 陈凤娟 E-mail:ymliusheng @163.com
  • 作者简介:陈凤娟(1979),女,辽宁本溪人,硕士,讲师,CCF会员(E200007832M),研究方向为粗糙集理论和数据挖掘等;孙静,硕士,讲师,研究方向为粗糙集和计算机网络等。

Absolute Reduction in the Information View of Rough Sets

CHEN Fengjuan,SUN Jing   

  1. (Department of Information Technology,Liaoning University of International Business and Economics,Dalian 116052,China)
  • Received:2009-11-15 Revised:2010-02-09 Online:2010-04-28 Published:2010-05-11
  • Contact: CHEN Fengjuan E-mail:ymliusheng @163.com

摘要:

绝对约简是粗糙集理论研究的基本内容之一,而在粗糙集的信息观中,绝对约简的相关定理还存在着一些不足。本文分析了现有的一些关于划分与知识信息熵的关系定理以及绝对约简的充要条件定理,提出新的关于划分和条件信息熵的对应关系定理,并给出其证明过程;依据该定理提出新的粗糙集信息观的绝对约简的充要条件,并给出相关证明。

关键词: 粗糙集, 信息熵, 条件信息熵, 绝对约简

Abstract:

The absolute reduction is a basic element of the rough set theory research. In the information view of rough sets there are still some drawbacks on the relevant theorems of the absolute reduction. Some existing theorems about the relationship between division and information entropy and theorems about the necessary and sufficient conditions of absolute reduction are analyzed. Then some new theorems about the relationship between division and conditional information entropy have been proposed. And the process of proving the theorems is given. Based on these new theorems, a necessary and sufficient condition of absolute reduction in the information view of RS is put forward. Then the relevant proving process is given too.

Key words: rough set;information entropy;conditional information entropy;absolute reduction

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