Abstract
Type-2 fuzzy sets (T2FSs) exhibit evident merits when it comes to representing the complex and high uncertainty, which has been encountered in fuzzy optimization and multiple criteria decision making (MCDM) problems. Since T2FSs theory was proposed by Zadeh in 1975, then a series of theories and methods were investigated by more scholars. Type-2 fuzzy aggregation operators, contributing to the fundamental information fusion theory, have been paid more attention and applied to different areas during the last two decades. In this paper, a survey of type-2 fuzzy aggregation and application for MCDM is carried out. We first review some basic knowledge including definitions, operations, type reduction and ranking methods of T2FSs. Then the definitions and properties of some main aggregation operators are introduced. Furthermore, some application categories under type-2 fuzzy environment are given. Finally, we identify some existing shortcomings and point at future research directions on this topic.
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Acknowledgements
We thank Professor Witold Pedrycz very much for his valuable suggestions and comments. The work was supported by the National Natural Science Foundation of China (NSFC) under Project 71701158, MOE (Ministry of Education in China) Project of Humanities and Social Sciences (Project No. 17YJC630114) and the Fundamental Research Funds for the Central Universities 2018IVB036.
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Qin, J. A survey of type-2 fuzzy aggregation and application for multiple criteria decision making. J. of Data, Inf. and Manag. 1, 17–32 (2019). https://doi.org/10.1007/s42488-019-00002-1
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DOI: https://doi.org/10.1007/s42488-019-00002-1