Article ID: | iaor20116818 |
Volume: | 11 |
Issue: | 2 |
Start Page Number: | 160 |
End Page Number: | 178 |
Publication Date: | Jun 2011 |
Journal: | International Journal of Operational Research |
Authors: | Jauhari Wakhid Ahmad, Pujawan I Nyoman, Wiratno Stefanus Eko, Priyandari Yusuf |
Keywords: | iterative methods, lot sizing, safety stock, uncertainty, Operating costs |
In this paper, we consider single vendor single buyer integrated inventory model with probabilistic demand and equal delivery lot size. The model contributes to the current literature by relaxing the deterministic demand assumption which has been used for almost all integrated inventory models. The objective is to minimise expected total costs incurred by the vendor and the buyer. We develop effective iterative procedures for finding the optimal solution. Numerical examples are used to illustrate the benefit of integration. A sensitivity analysis is performed to explore the effect of key parameters on delivery lot size, safety factor, production lot size factor and the expected total cost. The results of the numerical examples indicate our integrated model gives a significant cost savings over independent model.