Title: A two-warehouse inventory model for deteriorating item under permissible delay in payment via particle swarm optimisation
Authors: Asoke Kumar Bhunia; Ali Akbar Shaikh; Laxminarayan Sahoo
Addresses: Department of Mathematics, The University of Burdwan, Burdwan – 713104, India ' Department of Mathematics, Krishnagar Govt. College, Krishnagar – 741101, India ' Department of Mathematics, Raniganj Girls' College, Raniganj – 713358, India
Abstract: The objective of this paper is to develop a two-warehouse inventory model for single deteriorating item considering allowable delay in payment with two separate warehouses (one is OW, the owned warehouse and other is RW, the rented warehouse) having different preserving facilities. Shortages, if any, are allowed and partially backlogged with a rate dependent on the duration of waiting time up to the arrival of next lot. To develop this model, two different policies [inventory follows shortage (IFS) and shortage follows inventory (SFI)] have been considered. The corresponding problems have been formulated as nonlinear constrained optimisation problems and solved by different versions of quantum behaved particle swarm optimisation algorithms. Then, to illustrate and validate the model, four numerical examples have been considered and solved. Finally, to study the effect of changes of different parameters, sensitivity analyses have been carried out by changing one parameter at a time and keeping the others at their original values.
Keywords: two-warehouse inventory modelling; deteriorating items; deterioration; time dependent demand; permissible delay; payment delays; partial backlogging; shortages; particle swarm optimisation; PSO; inventory management.
International Journal of Logistics Systems and Management, 2016 Vol.24 No.1, pp.45 - 69
Received: 17 Dec 2014
Accepted: 27 Jan 2015
Published online: 31 Mar 2016 *