Metin Çakanyildirim

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We consider a discrete-time capacity expansion problem involving multiple product families, multiple machine types, and nonstationary stochastic demand. Capacity expansion decisions are made to strike an optimal balance between investment costs and lost sales costs. Motivated by current practices in the semiconductor and other high-tech industries, we(More)
In many inventory control contexts, inventory levels are only partially (i.e., not fully) observed. This may be due to non-observation of demand, spoilage, misplacement, or theft of inventory. We study a discrete-time periodic-review inventory system where the unmet demand is backordered. When inventory level is nonnegative, the inventory manager does not(More)
This paper revisits the finite-horizon model of a censored newsvendor by Ding, Puterman and Bisi (2002). An important result claimed there without a proper proof is that the myopic order quantity is always less than or equal to the optimal order quantity. Lu, Song and Zhu (2005b) has supplied a correct proof of the result. We analyze the same model using(More)
In many inventory control contexts, inventory levels are only partially (i.e., not fully) observed. This may be due to non-observation of demand, spoilage, misplacement, or theft of inventory. We study a partially observed inventory system where the demand is not observed, inventory level is noticed when it reaches zero, the unmet demand is lost, and(More)
This paper introduces two-dimensional (weight and volume) overbooking problems arising mainly in the cargo revenue management, and compares them with one-dimensional problems. It considers capacity spoilage and cargo offloading costs, and minimizes their sum. For one-dimensional problems, it shows that the optimal overbooking limit does not change with the(More)