Granular Structure of Type-2 Fuzzy Rough Sets over Two Universes

Granular Structure of Type-2 Fuzzy Rough Sets over Two Universes
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两个域上2型模糊粗糙集的粒结构

DOI:
10.3390/sym9110284
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发表时间:
2017-11
期刊:
影响因子:
2.7
通讯作者:
Bai Hexiang
Bai Hexiang
中科院分区:
综合性期刊4区
文献类型:
--
作者:
Lu Juan;Li Deyu;Zhai Yanhui;Bai Hexiang

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粒结构在粒计算方法的模型构建、理论分析和算法设计中起着非常重要的作用。经典粗糙集和模糊粗糙集的粒度结构已经被证明是清晰的。在经典粗糙集理论中,等价类是基本粒,集合的上、下近似可以由这些基本粒来计算。在模糊粗糙集理论中,粒模糊集可以用来描述模糊集的上、下近似。讨论了两个论域上的二型模糊粗糙集的粒结构。基于二型模糊集的波片表示,给出了两个论域上的二型模糊粗糙集的定义。推导了两个粒度的二型模糊集,并证明了它们是两个论域上的二型模糊粗糙集的基本粒。然后,研究了上、下近似算子以及这两个粒2型模糊集的性质。最后,通过实例说明了二类模糊粗糙集在两个论域上的应用。
Granular structure plays a very important role in the model construction, theoretical analysis and algorithm design of a granular computing method. The granular structures of classical rough sets and fuzzy rough sets have been proven to be clear. In classical rough set theory, equivalence classes are basic granules, and the lower and upper approximations of a set can be computed by those basic granules. In the theory of fuzzy rough set, granular fuzzy sets can be used to describe the lower and upper approximations of a fuzzy set. This paper discusses the granular structure of type-2 fuzzy rough sets over two universes. Definitions of type-2 fuzzy rough sets over two universes are given based on a wavy-slice representation of type-2 fuzzy sets. Two granular type-2 fuzzy sets are deduced and then proven to be basic granules of type-2 fuzzy rough sets over two universes. Then, the properties of lower and upper approximation operators and these two granular type-2 fuzzy sets are investigated. At last, several examples are given to show the applications of type-2 fuzzy rough sets over two universes.
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