Title: A stochastic lot sizing model with partial backordering and imperfect production processes

Authors: Ata Allah Taleizadeh; Negin Zamani-Dehkordi

Addresses: School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran ' School of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran

Abstract: This research presents an inventory system with partial backordering and imperfect process with a stochastic numbers of products that are defective per order. This problem is known and there are some customers that do not wait for their orders to be fulfilled so a particular proportion of backordered items become lost sales. This paper considers both mentioned situations simultaneously while the number of defective items follows a uniform distribution and the proportion of backordering is constant. This condition is modelled. The cost function of this inventory model includes order cost, holding cost and two types of shortage costs, one of them is related to backordered items and the other one is related to lost sales. This paper also provides a solution method to obtain optimum values for the decision variables, order quantity and total shortage, then we derive the value of the total cost function according to the optimum values obtained for the decision variables. Finally, some numerical results and diagrams are provided to show how some parameters affect the values of the decision variables and the cost function.

Keywords: inventory; EOQ model; defective items; partial backordering.

DOI: 10.1504/IJIR.2017.085356

International Journal of Inventory Research, 2017 Vol.4 No.1, pp.75 - 96

Received: 29 Oct 2016
Accepted: 16 Nov 2016
Published online: 24 Jul 2017 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article