The relationship between similarity measure and entropy
of intuitionistic fuzzy sets
q
Jinquan Li
a
, Guannan Deng
b
, Hongxing Li
c
, Wenyi Zeng
d,
⇑
a
School of Applied Mathematics, Research Center of Fuzzy Systems, Beijing Normal University, Zhuhai, Guangdong 519087, PR China
b
School of Sciences, Northeast Dianli University, Jilin, 132012, PR China
c
School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, PR China
d
College of Information Science and Technology, Beijing Normal University, Beijing 100875, PR China
article info
Article history:
Received 19 May 2008
Received in revised form 6 April 2011
Accepted 13 November 2011
Available online 22 November 2011
Keywords:
Intuitionistic fuzzy set
Fuzzy set
Similarity measure
Entropy
Uncertainty measure
abstract
In this paper, we introduce an axiomatic definition of the similarity measure of intuition-
istic fuzzy sets (IFS) that differs from the definition of Li [15]. The relationship between the
similarity measure and the entropy of IFS is investigated in detail. Six theorems on how the
similarity measure could be transformed into the entropy for IFS and vice versa are pro-
posed based on their axiomatic definitions. Some formulas have been proposed to calculate
the similarity measure and the entropy of IFS. Finally, sufficient conditions to transform the
similarity measures to the entropy for IFS and vice versa are given.
2011 Elsevier Inc. All rights reserved.
1. Introduction
Many new approaches and theories treating imprecision and uncertainty have been proposed since the fuzzy set was
introduced by Zadeh [33]. Some of these theories, such as the interval-valued fuzzy sets [34–36] and the generalized theory
of uncertainty (GTU), both introduced by Zadeh [37], are extensions of the classic fuzzy set theory, and have allowed people
to address uncertainty and information from a much broader perspective. Another well-known generalization of an ordinary
fuzzy set is the intuitionistic fuzzy set (IFS), which was introduced by Atanassov [1]. Since then, many researchers have
investigated this topic and have established some meaningful conclusions. For example, Grzegorzewski [10] discussed the
possible and necessary inclusion of IFS; Casti
^
neira et al. [4] established an axiomatic definition of the incompatibility mea-
sure in the framework of the IFS of Atanassov; Cristea and Davvaz [6] studied the connections between hypergroupoids and
the IFS of Atanassov; and Dudek et al. [8] investigated the intuitionistic fuzzy sub-hyperquasigroups of hyperquasigroups;
Hung and Yang [13] constructed J-divergence between IFS and applied it to pattern recognition; while Liu and Wang [17]
presented new methods to solve multi-criteria decision-making problems in an intuitionistic fuzzy environment. Pankowska
and Wygralak [21] introduced the concept of general IFS with triangular norm-based hesitation degrees and applied it to
construct flexible algorithms of group decision making; Xu [30] developed an approach in group decision making based
on intuitionistic preference relationships and proposed clustering algorithm for IFS in [31]; Szmidt and Kacprzyk [24]
0020-0255/$ - see front matter 2011 Elsevier Inc. All rights reserved.
doi:10.1016/j.ins.2011.11.021
q
This paper is supported by the National 973 Fundamental Research Project of China (2002CB312200, 2009CB320602) and the National Natural Science
Foundation of China (Nos. 10971243, 90818025, 60774049 and 60834004).
⇑
Corresponding author. Tel.: +86 10 62209376.
E-mail address: zengwy@bnu.edu.cn (W. Zeng).
Information Sciences 188 (2012) 314–321
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