title: Multi-item multiperiodic inventory control problem with variable demand and discounts: a particle swarm optimization algorithm.
abstract: A multi-item multiperiod inventory control model is developed for known-deterministic variable demands under limited available budget. Assuming the order quantity is more than the shortage quantity in each period, the shortage in combination of backorder and lost sale is considered. The orders are placed in batch sizes and the decision variables are assumed integer. Moreover, all unit discounts for a number of products and incremental quantity discount for some other items are considered. While the objectives are to minimize both the total inventory cost and the required storage space, the model is formulated into a fuzzy multicriteria decision making (FMCDM) framework and is shown to be a mixed integer nonlinear programming type. In order to solve the model, a multiobjective particle swarm optimization (MOPSO) approach is applied. A set of compromise solution including optimum and near optimum ones via MOPSO has been derived for some numerical illustration, where the results are compared with those obtained using a weighting approach. To assess the efficiency of the proposed MOPSO, the model is solved using multi-objective genetic algorithm (MOGA) as well. A large number of numerical examples are generated at the end, where graphical and statistical approaches show more efficiency of MOPSO compared with MOGA.
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Seyed Mohsen
authors.initials: SM
authors.lastname: Mousavi
authors.affiliation: Department of Industrial Engineering, Sharif University of Technology, P.O. Box 11155-0414 Azadi Avenue, Tehran 1458889694, Iran.
authors.forename: S T A
authors.initials: ST
authors.lastname: Niaki
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Ardeshir
authors.initials: A
authors.lastname: Bahreininejad
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Siti Nurmaya
authors.initials: SN
authors.lastname: Musa
mesh_terms: D000465:Algorithms; D003657:Decision Making; D008962:Models, Theoretical
references.citation: Evol Comput. 2000 Summer;8(2):149-72
references.pmid: 10843519
references.citation: Evol Comput. 2002 Fall;10(3):263-82
references.pmid: 12227996