Sürekli gözden geçirilen envanter sistemlerinde stok tayınlama politikaları üzerine

ABSTRACTON STOCK RATIONING POLICIES FOR CONTINUOUS REVIEWINVENTORY SYSTEMSÖnder BulutM.S. in Industrial EngineeringSupervisor: Asst. Prof. M. Murat FadıloğluJuly 2005Rationing is an inventory policy that allows prioritization of different demandclasses. In this thesis, we analyze the stock rationing policies for continuousreview systems. We clarify some of the ambiguities present in the currentliterature. Then, we propose a new method for the exact analysis of lot-for-lotinventory systems with backorders under rationing policy. We show that ifsuch an inventory system is sampled at multiples of supply leadtime, the stateof the system evolves according to a Markov chain. We provide a recursiveprocedure to generate the transition probabilities of the embedded Markovchain. It is possible to obtain the steady-state probabilities of interest withdesired accuracy by considering a truncated version of the chain. Finally, wepropose a dynamic rationing policy, which makes use of the information on thestatus of the outstanding replenishment orders. We conduct a simulation studyto evaluate the performance of the proposed policy.Keywords: Stochastic inventory models, stock rationing, multiple demandclasses, embedded Markov chains, solution of infinite state space Markovchains