不完备信息系统中基于联系度的粗集模型拓展  

Extension of Rough Set Model Based on Connection Degree under in Complete Information Systems

作　　者：黄兵[1] 周献中[1] 

机构地区：[1]南京理工大学自动化系1004教研室,江苏南京210094

出　　处：《系统工程理论与实践》2004年第1期88-92,共5页Systems Engineering-Theory & Practice

摘　　要：　在分析几种已有的针对不完备信息系统的粗集拓展模型基础上,提出了一种基于联系度的粗集拓展模型.该模型的方法是:通过引入阈值将原不完备信息系统进行划分,再利用基于联系度的容差关系确定类,利用产生的这些类得到上下近似.通过例说明该模型是符合客观实际的,更重要的是在容差类的划分中通过引入阈值考虑了根据人的主观要求,这与人机结合以人为主的系统方法论是一致的.In this paper, several extended rough set models are analyzed and another model is presented. In this model, thresholds are introduced and an incomplete system is divided into two parts. The aim of tolerant relation based on connection degree is to ascertain classes by which the lower approximation set and upper approximation set of a set in universe are confirmed. By an example, this model presented in this paper is accord with facts. It is important that man can control the partition of universe in some way by thresholds. Accordingly, rough set models under incomplete system are extended effectively.

关 键 词：粗集 等价关系 容差关系 相似关系 限制容差关系 联系度容差关系 不完备信息系统 模型 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]