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publication name DEVELOPMENT OF FUZZY LOGIC-BASED ARITHMETIC AND VISUAL REPRESENTATIONS FOR SYSTEMS’ MODELING AND OPTIMIZATION IN FULLY FUZZY ENVIRONMENT
Authors HASSEN TAHER DORRAH, WALAA IBRAHIM MAHMOUD GABR
year 2009
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Abstract

This paper presents the development of fuzzy logic-based representations using the notion of normalized fuzzy matrices as recently developed by Gabr and Dorrah for solving modeling and optimization problems in a fully fuzzy environment. The first is the arithmetic type based on dual cell representation, expressed by replacing each parameter with a pair of parentheses, the first is the actual value and the second is corresponding fuzzy level, (Value, Fuzzy Level). The second is the visual type based on colored cells representation expressed by replacing each parameter by its value and coded (negative or positive) color based on the color Hue circle corresponding to its fuzzy level. The linear and quadratic programming problems formulations in their general form are developed as demonstrations of the proposed concept in a fully fuzzy environment. A modified dual simplex method algorithm is depicted for the representation of the equivalent linear optimization problem. The problem is represented in a spreadsheet model with built-in programmed Visual Basic Applications macros. The proposed fuzzy logic algebra is then used in a straightforward manner inside this spreadsheet model. The fuzzy logic levels can be easily transferred at the end of the solution to equivalent uncertainties (each level is substituted by a corresponding actual mean and actual standard deviation). Finally, two numerical examples are provided to illustrate the efficacy of the developed formulations

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