eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
1
11
129
Scheduling of a flexible flow shop with multiprocessor task by a hybrid approach based on genetic and imperialist competitive algorithms
Javad Rezaeian
j.rezaeian@ustmb.ac.ir
1
Hany Seidgar
hany_seidgar@yahoo.com
2
Morteza Kiani
morteza.kiyany@gmail.com
3
Department of industrial engineering, Mazandaran University of Science and Technology, Babol, Iran
Department of industrial engineering, Mazandaran University of Science and Technology, Babol, Iran
Department of industrial engineering, Mazandaran University of Science and Technology, Babol, Iran
This paper presents a new mathematical model for a hybrid flow shop scheduling problem with multiprocessor tasks in which sequence dependent set up times and preemption are considered. The objective is to minimize the weighted sum of makespan and maximum tardiness. Three meta-heuristic methods based on genetic algorithm (GA), imperialist competitive algorithm (ICA) and a hybrid approach of GA and ICA are proposed to solve the generated problems. The performances of algorithms are evaluated by computational time and Relative Percentage Deviation (RPD) factors. The results indicate that ICA solves the problems faster than other algorithms and the hybrid algorithm produced best solution based on RPD.
http://www.qjie.ir/article_129_40dd7b5e8fb719178570651eef549774.pdf
Hybrid flow shop scheduling
Multi processor tasks
sequence dependent setup time
Preemption
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
13
25
137
A cost-oriented model for multi-manned assembly line balancing problem
Abolfazl Kazemi
abkaazemi@gmail.com
1
Abdolhossein Sedighi
ab_kaazemi@yahoo.com
2
Department of industrial engineering, Islamic Azad University, Qazvin Branch, Qazvin Iran
Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran
In many real world assembly line systems which the work-piece is of large size more than one worker work on the same work-piece in each station. This type of assembly line is called multi-manned assembly line (MAL). In the classical multi-manned assembly line balancing problem (MALBP) the objective is to minimize the manpower needed to manufacture one product unit. Apart from the manpower, other cost drivers like wage rates or machinery are neglected in this classical view of the problem. However due to the high competition in the current production environment, reducing the production costs and increasing utilization of available resources are very important issues for manufacturing managers. In this paper a cost-oriented approach is used to model the MALBP with the aim of minimizing total cost per production unit. A mathematical model is developed to solve the problem. Since the proposed model is NP-hard, several heuristic algorithms and a genetic algorithm (GA) are presented to efficiently solve the problem. Parameters and operators of the GA are selected using the design of experiments (DOE) method. Several examples are solved to illustrate the proposed model and the algorithms.
http://www.qjie.ir/article_137_66232200736f343a352a980af9cb8521.pdf
Multi-manned assembly line
Cost-oriented approach
Heuristic
Genetic Algorithm
Design of experiments
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
27
37
144
A New Algorithm for the Discrete Shortest Path Problem in a Network Based on Ideal Fuzzy Sets
Sadollah Ebrahimnejad
1
Seyed Meysam Mousavi
2
Behnam Vahdani
3
Assistant Professor, Department of Industrial Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran
Ph.D. Student, Young Researches Club, South Tehran Branch, Islamic Azad University, Tehran, Iran
Assistant Professor, Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran
A shortest path problem is a practical issue in networks for real-world situations. This paper addresses the fuzzy shortest path (FSP) problem to obtain the best fuzzy path among fuzzy paths sets. For this purpose, a new efficient algorithm is introduced based on a new definition of ideal fuzzy sets (IFSs) in order to determine the fuzzy shortest path. Moreover, this algorithm is developed for a fuzzy network problem including three criteria, namely time, cost and quality risk. Several numerical examples are provided and experimental results are then compared against the fuzzy minimum algorithm with reference to the multi-labeling algorithm based on the similarity degree in order to demonstrate the suitability of the proposed algorithm. The computational results and statistical analyses indicate that the proposed algorithm performs well compared to the fuzzy minimum algorithm.
http://www.qjie.ir/article_144_d85c20492b1a214701dc86923bd91ce6.pdf
Shortest path problem
Single criterion networks
Multiple criteria networks
Fuzzy sets
Ideal fuzzy sets
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-01
6
13
39
47
145
A New Fuzzy Method for Assessing Six Sigma Measures
Seyed Habib A Rahmati
1
Abolfazl Kazemi
2
Mohammad Saidi Mehrabad
3
Alireza Alinezhad
alinezhad_ir@yahoo.com
4
Instructor, Faculty of Industrial and Mechanical Engineering, Qazvin branch, Islamic Azad University, Qazvin, Iran
Assistant Professor, Faculty of Industrial and Mechanical Engineering, Qazvin branch, Islamic Azad University, Qazvin, Iran
Professor, Department of Industrial Engineering, Iran University of Science and Technology, Tehran, , Iran
Faculty of industrial and mechanical engineering, Qazvin branch, Islamic Azad Univeristy, Qazvin, Iran
Six-Sigma has some measures which measure performance characteristics related to a process. In most of the traditional methods, exact estimation is used to assess these measures and to utilize them in practice. In this paper, to estimate some of these measures, including Defects per Million Opportunities (DPMO), Defects per Opportunity (DPO), Defects per unit (DPU) and Yield, a new algorithm based on Buckley's estimation approach is introduced. The algorithm uses a family of confidence intervals to estimate the mentioned measures. The final results of introduced algorithm for different measures are triangular shaped fuzzy numbers. Finally, since DPMO, as one of the most useful measures in Six-Sigma, should be consistent with costumer need, this paper introduces a new fuzzy method to check this consistency. The method compares estimated DPMO with fuzzy customer need. Numerical examples are given to show the performance of the method. All rights reserved
http://www.qjie.ir/article_145_6d0d4db4b9211e3dc5a3e0e959836446.pdf
Six Sigma
Fuzzy set
Fuzzy estimation
DPU
DPO
Yield
DPMO
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
49
54
138
Optimization of Plastic Injection Molding Process by Combination of Artificial Neural Network and Genetic Algorithm
MOHAMMAD SALEH MEIABADI
saleh.meiabadi@yahoo.com
1
abbas Vafaei
abbas_v@yahoo.com
2
Fatemeh Sharifi
3
ARTICLE
THESIS ADVISOR
computer engineering department, chamran university, ahvaz, iran
Injection molding is one of the most important and common plastic formation methods. Combination of modeling tools and optimization algorithms can be used in order to determine optimum process conditions for the injection molding of a special part. Because of the complication of the injection molding process and multiplicity of parameters and their interactive effects on one another, analytical modeling of the process is either impossible or difficult. Therefore Artificial Neural Network (ANN) is used for modeling the process. Process conditions data is needed for modeling the process by the neural network. After modeling step, the model is combined with the Genetic Algorithm (GA). Based on the injection molding goals that have been turned into fitness function, the optimized conditions are obtained.
http://www.qjie.ir/article_138_1c5b28f9870f3292302cdaeffbcbe3e0.pdf
Optimization
Solution space
Control variable
Neural Network
Genetic Algorithm
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
55
64
146
A Multi-level Capacitated Lot-sizing Problem with Safety Stock Deficit and Production Manners: A Revised Simulated Annealing
Esameil Mehdizadeh
1
Mohammad Reza Mohammadizadeh
2
Assistant Professor, Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
M.Sc.Student , Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
[1] Corresponding author e-mail: mehdi.foumani@monash.edu [1] Corresponding author e-mail: mehdi.foumani@monash.edu Lot-sizing problems (LSPs) belong to the class of production planning problems in which the availability quantities of the production plan are always considered as a decision variable. This paper aims at developing a new mathematical model for the multi-level capacitated LSP with setup times, safety stock deficit, shortage, and different production manners. Since the proposed linear mixed integer programming model is NP-hard, a new version of simulated annealing algorithm (SA) is developed to solve the model named revised SA algorithm (RSA). Since the performance of the meta-heuristics severely depends on their parameters, Taguchi approach is applied to tune the parameters of both SA and RSA. In order to justify the proposed mathematical model, we utilize an exact approach to compare the results. To demonstrate the efficiency of the proposed RSA, first, some test problems are generated; then, the results are statistically and graphically compared with the traditional SA algorithm.
http://www.qjie.ir/article_146_5f57175f126121b819ad0d276124cb45.pdf
Lot-sizing problem
simulated annealing
Shortage
Safety stock deficit
Production manners
eng
QIAU
Journal of Optimization in Industrial Engineering
2251-9904
2423-3935
2013-09-02
6
13
65
72
140
The project portfolio selection and scheduling problem: mathematical model and algorithms
Bahman Naderi
bahman.naderi@aut.ac.ir
1
Young Researches Club, Qazvin Branch, Islamic Azad University
This paper investigates the problem of selecting and scheduling a set of projects among available projects. Each project consists of several tasks and to perform each one some resource is required. The objective is to maximize total benefit. The paper constructs a mathematical formulation in form of mixed integer linear programming model. Three effective metaheuristics in form of the imperialist competitive algorithm, simulated annealing and genetic algorithm are developed to solve such a hard problem. The proposed algorithms employ advanced operators. The performance of the proposed algorithms is numerically evaluated. The results show the high performance of the imperialist competitive algorithm outperforms the other algorithms.
http://www.qjie.ir/article_140_73ac9fddc0f128714d5f83a11124b2e2.pdf
Project portfolio selection and scheduling
Imperialist Competitive Algorithm
simulated annealing
Genetic Algorithm
Mixed Integer programming