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Two fuzzy covering rough set models and their generalizations over fuzzy lattices

机译:两种模糊覆盖粗糙集模型及其在模糊格上的推广

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By introducing the new concepts of fuzzy beta-covering and fuzzy beta-neighborhood, we define two new types of fuzzy covering rough set models which can be regarded as bridges linking covering rough set theory and fuzzy rough set theory. We show the properties of the two models, and reveal the relationships between the two models and some others. Moreover, we present the matrix representations of the newly defined lower and upper approximation operators so that the calculation of lower and upper approximations of subsets can be converted into operations on matrices. Finally, we generalize the models and their matrix representations to L-fuzzy covering rough sets which are defined over fuzzy lattices. (C) 2015 Elsevier B.V. All rights reserved.
机译:通过引入模糊β覆盖和模糊β邻域的新概念,我们定义了两种新型的模糊覆盖粗糙集模型,这些模型可以看作是连接覆盖粗糙集理论和模糊粗糙集理论的桥梁。我们展示了这两个模型的属性,并揭示了这两个模型与其他模型之间的关系。此外,我们提出了新定义的上下近似算子的矩阵表示,以便子集的上下近似算子的计算可以转换为对矩阵的运算。最后,我们将模型及其矩阵表示形式推广到覆盖模糊格子上定义的粗糙集的L-fuzzy。 (C)2015 Elsevier B.V.保留所有权利。

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