Execution of arithmetic operations involving the second-order fuzzy numbers

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.210103

Keywords:

fuzzy numbers of (L-R)-type, second-order fuzziness, algebra of operations, arithmetic operations, execution rules

Abstract

The need to improve the adequacy of conventional models of the source data uncertainty in order to undertake research using fuzzy mathematics methods has led to the development of natural improvement in the analytical description of the fuzzy numbers' membership functions. Given this, in particular, in order to describe the membership functions of the three-parametric fuzzy numbers of the (L-R)-type, the modification implies the following. It is accepted that these functions' parameters (a modal value, the left and right fuzzy factors) are not set clearly by their membership functions. The numbers obtained in this way are termed the second-order fuzzy numbers (bi-fuzzy). The issue, in this case, is that there are no rules for operating on such fuzzy numbers. This paper has proposed and substantiated a system of operating rules for a widely used and effective class of fuzzy numbers of the (L-R)-type whose membership functions' parameters are not clearly defined. These rules have been built as a result of the generalization of known rules for operating on regular fuzzy numbers. We have derived analytical ratios to compute the numerical values of the membership functions of the fuzzy results from executing arithmetic operations (addition, subtraction, multiplication, division) over the second-order fuzzy numbers. It is noted that the resulting system of rules is generalized for the case when the numbers-operands' fuzziness order exceeds the second order. The examples of operations execution over the second-order fuzzy numbers of the (L-R)-type have been given.

Author Biographies

Lev Raskin, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor, Head of Department

Department of Distributed Information Systems and Cloud Technologies

Oksana Sira, National Technical University «Kharkiv Polytechnic Institute» Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor

Department of Distributed Information Systems and Cloud Technologies

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Published

2020-08-31

How to Cite

Raskin, L., & Sira, O. (2020). Execution of arithmetic operations involving the second-order fuzzy numbers. Eastern-European Journal of Enterprise Technologies, 4(4 (106), 14–20. https://doi.org/10.15587/1729-4061.2020.210103

Issue

Vol. 4 No. 4 (106) (2020): Mathematics and Cybernetics - applied aspects

Section

Mathematics and Cybernetics - applied aspects

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Copyright (c) 2020 Lev Raskin, Oksana Sira

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