International Journal of Industrial MathematicsInternational Journal of Industrial Mathematics
http://iranjournals.nlai.ir/1249/
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http://iranjournals.nlai.ir/1249/
Feed provided by International Journal of Industrial Mathematics. Click to visit.A New Approach for Solving Fully Fuzzy Bilevel Linear Programming Problems
http://iranjournals.nlai.ir/1249/article_628455_85049.html
This paper addresses a type of fully fuzzy bilevel linear programming (FFBLP) wherein all the coefficients and decision variables in both the objective function and constraints are triangular fuzzy numbers. This paper proposes a new simple-structured, efficient method for FFBLP problems based on crisp bilevel programming that yields fuzzy optimal solutions with unconstraint variables and parameters. some examples have been provided to illustrate these methods.Tue, 31 Dec 2019 20:30:00 +0100Defuzzification Method for Solving Fuzzy Linear Programming Problems
http://iranjournals.nlai.ir/1249/article_628456_85049.html
Several authors have proposed different methods to find the solution of fully fuzzy linear programming (FFLP) problems. But all the existing methods are based on the assumption that all the fuzzy coefficients and the fuzzy variables are non-negative fuzzy numbers. in this paper a new method is proposed to solve an FFLP problems with arbitrary fuzzy coefficients and arbitrary fuzzy variables, that is, there is no restriction on the elements that have been used in the FFLP problems. By using the radius of gyration function (ROG) we show that fuzzy solution obtained of solving FFLP problems, is exact fuzzy optimal solution of FFLP problems. The introduce method are very easy to understand and to apply for fully fuzzy linear systems occurring in real life situation.Tue, 31 Dec 2019 20:30:00 +0100Local Annihilation Method and Some Stiff Problems
http://iranjournals.nlai.ir/1249/article_628457_85049.html
In this article, a new scheme inspired from collocation method is presented for numerical solution of stiff initial-value problems and Fredholm integral equations of the first kind based on the derivatives of residual function. Then, the error analysis of this method is investigated by presenting an error bound. Numerical comparisons indicate that the presented method yields accurate approximations in many cases in which the collocation method is failed.Tue, 31 Dec 2019 20:30:00 +0100Identification and Ranking Effective Factors in Increasing Personnel Satisfaction with ...
http://iranjournals.nlai.ir/1249/article_628458_85049.html
The main purpose of this study was to investigate employees and managers’ satisfaction of transportation system in the steal and rolling Units of Saba in Mobarakeh Steel Company using the intuitionistic fuzzy data. The statistical population included the personnel of Saba Steel and Rolling Units from Mobarakeh Steel Company including 1800 people.Sat, 02 Nov 2019 20:30:00 +0100A Hybrid DEA Based CHAID and Imperialist Competitive Algorithm for Stock Selection
http://iranjournals.nlai.ir/1249/article_628459_85049.html
In this paper, the investment portfolio is formed based on the data mining algorithm of CHAID on the basis of the risk status criteria. In the next step, the second investment portfolio is created based on the decision rules extracted by the DEA-BCC model. The final portfolio is created through a two-objective mathematical programming model based on the Imperialist Competitive algorithm.Tue, 31 Dec 2019 20:30:00 +0100Solving a Joint Availability-Redundancy Optimization Model with Multi-State Components with ...
http://iranjournals.nlai.ir/1249/article_628460_85049.html
This paper has been worked on a RAP with multi-state components and the performance rate of each component working state may increase by spending technical and organizational activities costs. Whereas RAP belongs to Np-Hard problems, we used Genetic algorithm (GA) and simulated annealing (SA) and for solving the presented problem and calculating system reliability universal generating function (UGF) have been used.Tue, 31 Dec 2019 20:30:00 +0100Computing the Matrix Geometric Mean of Two HPD Matrices: A Stable Iterative Method
http://iranjournals.nlai.ir/1249/article_628461_85049.html
A new iteration scheme for computing the sign of a matrix which has no pure imaginary eigenvalues is presented. Then, by applying a well-known identity in matrix functions theory, an algorithm for computing the geometric mean of two Hermitian positive definite matrices is constructed. Moreover, another efficient algorithm for this purpose is derived free from the computation of principal matrix square root. Finally, several experiments are collected.Tue, 31 Dec 2019 20:30:00 +0100Performance Measurement Techniques In the Presence of Undesirable Products
http://iranjournals.nlai.ir/1249/article_628462_85049.html
Performance measurement with undesirable outputs is an important subject in production processes. There are papers in which works can be divided into two groups. First group develops production models which undesirable outputs are considered as inputs and in second one undesirable outputs are modeled as outputs. We provide a comparison between these two groups and we axiomatically show that production technology with weak disposability assumption is complete and correct technology.Tue, 31 Dec 2019 20:30:00 +0100Window Network Data Envelopment Analysis: An Application to Investment Companies
http://iranjournals.nlai.ir/1249/article_628463_85049.html
In this study, the window network data envelopment analysis (WNDEA) model will be proposed, that is capable to be used in the presence of panel data. Additionally, the proposed model is applied to evaluate the dynamic efficiency of 5 investment companies in Tehran stock exchange during the period from 2013 to 2017.Tue, 31 Dec 2019 20:30:00 +0100