Homomorphisms Between Covering Approximation Spaces

Homomorphisms Between Covering Approximation Spaces
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覆盖近似空间之间的同态

DOI:
10.3233/fi-2015-1216
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发表时间:
2015-07
影响因子:
0.8
通讯作者:
Guo Lankun
Guo Lankun
中科院分区:
计算机科学4区
文献类型:
--
作者:
Lang Guangming;li Qingguo;Guo Lankun

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信息系统同态的引入为属性约简做出了重要贡献。然而,在同态上所做的努力是远远不够的。本文进一步研究了覆盖逼近空间之间的同态。首先,我们引入了上同态、下同态和同态的概念,研究了覆盖逼近空间之间的关系。然后,我们提出了覆盖逼近子空间和乘积空间的概念。我们还压缩覆盖近似空间和覆盖信息系统的属性约简的目的。然后,利用原空间和原系统的压缩,对动态覆盖近似空间和动态覆盖信息系统进行压缩。最后通过几个例子说明了同态为压缩覆盖逼近空间和覆盖信息系统提供了一种有效的途径。
The introduction of information system homomorphisms has made a substantial contribution to attribute reduction. However, the efforts made on homomorphisms are far from sufficient. This paper further investigates homomorphisms between covering approximation spaces. First, we introduce the concepts of upper and lower homomorphisms as well as homomorphisms in order to study the relationship between covering approximation spaces. Then we present the notions of covering approximation subspaces and product spaces. We also compress covering approximation spaces and covering information systems with the aim of attribute reduction. Afterwards, by utilizing the compressions of the original spaces and systems we compress the dynamic covering approximation spaces and dynamic covering information systems. Several illustrative examples are employed to demonstrate that the homomorphisms provide an effective approach for compressing covering approximation spaces and covering information systems.
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