| 动态粒度下的粗糙集双向近似 |
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| 引用本文： | 吕国英,钱宇华,王宝丽,李茹.动态粒度下的粗糙集双向近似[J].计算机工程与应用,2009,45(4):165-168. |
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| 作者姓名： | 吕国英 钱宇华 王宝丽 李茹 |
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| 作者单位： | 1.山西大学 计算智能与中文信息处理省部共建重点实验室，太原 030006 2.山西大学 计算机与信息技术学院，太原 030006 3.运城学院 应用数学系，山西 运城 044000 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，山西省自然科学基金，山西省高等学校拔尖创新基金，太原市科技项目 |
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| 摘 要： | 经典的粗糙集理论刻画目标概念运用静态的粒度分析，不便于刻画人们问题求解的动态认知过程。已有文献分别用正向近似和逆向近似对目标概念和目标决策进行刻画，并成功地应用于分层聚类算法和规则提取方面。基于动态粒度原理，提出双向近似的概念，获得双向近似的一些重要性质，并将其应用于决策表中决策规则的获取。
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| 关 键 词： | 粗糙集 正向近似 逆向近似 双向近似 |
| 收稿时间： | 2008-1-9 |
| 修稿时间： | 2008-4-24
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Bidirectional approximation under dynamic granulation in rough sets theory |
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| LV Guo-ying,QIAN Yu-hua,WANG Bao-li,LI Ru.Bidirectional approximation under dynamic granulation in rough sets theory[J].Computer Engineering and Applications,2009,45(4):165-168. |
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| Authors: | LV Guo-ying QIAN Yu-hua WANG Bao-li LI Ru |
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| Affiliation: | 1.Key Laboratory of Ministry of Education for Computation Intelligence and Chinese Information Processing，Shanxi University，Taiyuan 030006，China 2.School of Computer & Information Technology，Shanxi University，Taiyuan 030006，China 3.Department of Applied Mathematics，Institute of Yuncheng，Yuncheng，Shanxi 044000，China |
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| Abstract: | In classical rough set theory,a target concept can usually be depicted via static granulation,which cannot well characterize dynamic cognitive process in problem solving.A target concept and a target decision were approximated using positive approximation and converse approximation,respectively,and they have been effectively applied in clustering algorithm and rule extracting.Based on dynamic granulation principle,the concept of bidirectional approximation is proposed,some important properties are obtained.... |
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| Keywords: | rough set theory positive approximation converse approximation bidirectional approximation |
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