Analysis of serial inventory systems under nonstationary demand

Baskan, Fevzi
In this study we consider a two-echelon supply chain with a nonstationary demand process. The retailer batches the customer demand for a predetermined number of periods before placing an order to the supplier. We show that the demand process for the supplier is more variable than that for the retailer. It is observed that the supplier can reduce the variability of orders by tracking the exogenous demand occurring at the retailer's side.


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Öztop, Muin Süleyman; Dursunkaya, Zafer; Department of Mechanical Engineering (2006)
In this study, a novel incremental ring rolling process used in production of rings with various cross sections is examined. A basic type of this process is investigated numerically, using commercial finite element programs; MSC Superform, MSC Marc. The user defined subroutines are also utilized for flexibility in modeling. The aim of modeling is to determine the material flow for geometrical analysis, strain/stress distribution for tool force analysis and residual stresses, in a cost effective way. The pro...
Analysis of an inventory system under backorder correlated deterministic demand and geometric supply process
Argon, NT; Gullu, R; Erkip, N (2001-05-06)
In this article we propose a single item, periodic review model that investigates the effects of changes in the demand process that occur after stockout realizations. We investigate a system where the demands in successive periods are deterministic but affected by the backorder realizations. In order to capture the effects of changes in the demand process we use a geometric type supply availability. We analytically derive the necessary components for obtaining profit related performance measures and provide...
Analysis of an inventory system under supply uncertainty
Gullu, R; Onol, E; Erkip, N (Elsevier BV, 1999-03-20)
In this paper, we analyze a periodic review, single-item inventory model under supply uncertainty. The objective is to minimize expected holding and backorder costs over a finite planning horizon under the supply constraints. The uncertainty in supply is modeled using a three-point probability mass function. The supply is either completely available, partially available, or the supply is unavailable. Machine breakdowns, shortages in the capacity of the supplier, strikes, etc., are possible causes of uncerta...
Optimal pricing and production decisions in utilizing reusable containers
Atamer, Busra; Bakal, İsmail Serdar; Bayındır, Zeynep Pelin (2013-06-01)
In this study, we focus on pricing and production decisions in utilizing reusable containers with stochastic customer demand. We consider a manufacturer that sells a single product to the customers in reusable containers with two supply options: (i) brand-new containers and (ii) returned containers from customers. The return quantity depends on both customer demand and the acquisition fee determined by the manufacturer. The unit cost of production using brand-new containers is different than the unit cost o...
Analysis of an options contract in a dual sourcing supply chain under disruption risk
Köle, Hüseyin; Bakal, İsmail Serdar; Department of Industrial Engineering (2012)
In this study, value of demand information and the importance of option contracts are investigated for a supply chain consisting of a buyer and two suppliers in a single period setting. One supplier is cheap but prone to disruptions whereas the other one is perfectly reliable but expensive. At the beginning of the period, buyer orders from the unreliable supplier and reserves from the reliable supplier through a contract that gives buyer an option to use reserved units after getting disruption information o...
Citation Formats
F. Baskan, “Analysis of serial inventory systems under nonstationary demand,” M.S. - Master of Science, Middle East Technical University, 2004.