Showing papers by "Kamran Moinzadeh published in 2001"
TL;DR: A total of four models are developed for evaluating cycle time and worker allocation alternatives with respect to labor and inventory holding costs and successfully applied these models to an airplane assembly process characterized by low-volume manufacturing.
52 citations
TL;DR: In this paper, the optimality of (s,S) policies in continuous review inventory models where demand forms a renewal process is revisited and a simple but practical ordering policy by introducing a delay in order placement as a policy parameter is proposed.
Abstract: In this paper, we revisit the optimality of (s,S) policies in continuous review inventory models where demand forms a renewal process. We explain why when orders are placed at demand epochs, (s,S) policies are not optimal in general, and propose a simple but practical ordering policy by introducing a delay in order placement as a policy parameter. Under our proposed policy, the operating characteristics of such systems can be evaluated using the existing results in the literature. In order to demonstrate the effectiveness of our policy, we restrict our analysis to a special class of inventory systems where demand follows a counting process, fixed ordering costs are negligible and leadtimes are constant. We derive expressions for the operating characteristics of such systems under our policy and present insights on the behavior of the policy parameters which minimize the average total cost rate under our policy. Using these results, we develop an efficient heuristic for computing the policy parameters. Finally, we investigate the effectiveness of our policy in comparison to policies which place orders only at demand epochs. The results of our numerical experiment indicate that our policy can result in a significant savings.
20 citations