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In this paper I will introduce the trapezoidal intuitionistic fuzzy numbers (IF numbers) and will prove some operations for them. Also I am going to propose a new ordering method for IF numbers in which I will consider two characteristic values of membership and non-membership functions for an IF number. These values are defined by the integral of the… (More)

The quadratic assignment problem (QAP) belongs to the class of NP-Hard problems and also is one of the hardest problems in this class. Today, regarding current hardware, solving the large size instances of this problem, using exact methods, is not possible in reasonable amount of time. In this way many heuristic (Meta-heuristic) and approximation methods… (More)

In this paper first, we find a canonical symmetrical trapezoidal(triangular) for the solution of the fuzzy linear system Ax̃ = b̃, where the elements in A and b̃ are crisp and arbitrary fuzzy numbers, respectively. Then, a model for fuzzy linear programming problem with fuzzy variables (FLPFV), in which, the right hand side of constraints are arbitrary… (More)

In this paper first we review two ranking methods for intuitionistic fuzzy numbers (IF numbers), then we proposed a new ordering method for IF numbers in which we consider two characteristic values of membership and non-membership for an IF number. Key-Words: Intuitionistic Fuzzy Number, Ranking Function Methods, Characteristic Value

- Hassan Mishmast Nehi, Abazar Keikha
- Journal of Intelligent and Fuzzy Systems
- 2016

- Abazar Keikha, Hassan Mishmast Nehi
- 2015 4th Iranian Joint Congress on Fuzzy and…
- 2015

TOPSIS method is a most useful tool for solving MADM problems, also, Choquet integral method is another powerful method which, is able to manage interaction criteria. In this paper, we combine both methods to use from their benefits. First, we will introduce a new method for computing the distance between IT2FSs. Then, we proposed a hybrid method based on… (More)

- Hasan Ali Ashayerinasab, Hassan Mishmast Nehi, Mehdi Allahdadi
- 2015 4th Iranian Joint Congress on Fuzzy and…
- 2015

In this paper, we review previous methods for solving interval linear programming (ILP) problems. In most of these methods such as BWC, ILP, TSM, and SOM-2 methods, part of solution space is absolutely infeasible and non-optimal. To eliminate infeasible part of solution space, several methods such as MILP, and ITSM are proposed. The solution space of these… (More)

- Ehsan Adili, Mohamad Reza Sohrabi, Hassan Mishmast Nehi
- Journal of Intelligent and Fuzzy Systems
- 2014

- Hamed Farahani, Hassan Mishmast Nehi, Mahmoud Paripour
- Journal of Intelligent and Fuzzy Systems
- 2016

- Neda Amiri, Farhad Hamidi, Hassan Mishmast Nehi
- 2015 4th Iranian Joint Congress on Fuzzy and…
- 2015

In this paper, effort has been made to solve the fuzzy fractional bilevel linear programming (FFBLP) problem with fuzzy parameters in the objective functions and constraints. These are among the problems that have been popular with only a few researchers in the recent years. We will first review the related literature and then study the solution procedures… (More)

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