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Generalized Uncertain Fuzzy Logic Systems

  • Chapter
Advanced Concepts in Fuzzy Logic and Systems with Membership Uncertainty

Part of the book series: Studies in Fuzziness and Soft Computing ((STUDFUZZ,volume 284))

Abstract

In this chapter, basic constructions of fuzzy logic systems with uncertain membership functions are presented. We begin with historical approaches to reasoning with interval-valued fuzzy sets and known formulations of general type-2 fuzzy logic systems. Next we provide new formulations grounded in non-singleton fuzzification. In the context of ordinary fuzzy systems, we demonstrate that variously interpreted non-singleton fuzzification, for typical structures fuzzy logic systems, can be implemented by the classical singleton structures only using modified antecedent fuzzy sets. The first approach to fuzzification of premises is done by the interpretation in terms of possibility distributions of actual inputs. Consequently, the possibility and necessity measures of antecedent fuzzy sets create boundaries for the interval-valued antecedent membership function. The second approach applies rough approximations to antecedent fuzzy sets by non-singleton fuzzy premise sets considered as fuzzy-rough partitions. Two known definitions, the one of Dubois and Prade, and the second proposed by Nakamura, lead to different formulations of fuzzy logic systems. Employing fuzzy-rough sets of Dubois and Prade, we obtain the interval-valued fuzzy logic system. Then, it can be immediately proved that upper approximations in fuzzy-rough systems are concurrent to fuzzification in conjunction-type fuzzy systems. Unexpectedly, lower approximations in fuzzy-rough systems coincide with fuzzification in logical-type fuzzy systems. Therefore, the proposed methods can be viewed as extensions to the conventional non-singleton fuzzification method. Fuzzyrough sets in the sense of Nakamura result with a formulation of a general fuzzy-valued fuzzy logic system. For this purpose, three realizations of general fuzzy-valued fuzzy systems: triangular, trapezoidal and Gaussian, are presented in details.

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  1. Department of Computer Engineering, Czestochowa University of Technology, Al. Armii Krajowej 36, 42-200, Czestochowa, Poland

    Janusz T. Starczewski

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Starczewski, J.T. (2013). Generalized Uncertain Fuzzy Logic Systems. In: Advanced Concepts in Fuzzy Logic and Systems with Membership Uncertainty. Studies in Fuzziness and Soft Computing, vol 284. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29520-1_4

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  • DOI: https://doi.org/10.1007/978-3-642-29520-1_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-29519-5

  • Online ISBN: 978-3-642-29520-1

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