Browsing by Subject "Inventories--Management."

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Open Access
An application of Silver Meal Heuristic to MRP lot sizing decisions at Turk Traktor Fabrikasi
(1995) Esmer, Berkhan N.
MRP does not consider setup and inventory holding costs for lot sizing but very quick algorithms like Silver-Meal can be used for lot sizing decisions. A module to apply Silver-Meal Heuristic to manufacturing work order releases at Türk Traktör Fabrikasy, Ankara, Turkey is designed and tested for 3 months. The module processes demand for finished goods, determines lot sizes, checks capacities by loading machines according to the schedule and reports the setup, inventory holding and overtime costs. These cost figures are compared with the MRP lot sizes. It is observed that, the planning time decreased by 90% by designing module in PCs connected to the main databases, and the total costs decreased by 50%.
Open Access
Essays on non-cooperative inventory games
(2012) Körpeoğlu, Evren
In this thesis we study different non–cooperative inventory games. In particular, we focus on joint replenishment games and newsvendor duopoly under asymmetric information. Chapter 1 contains introduction and motivation behind the research. Chapter 2 is a preliminary chapter which introduce basic concepts used in the thesis such as Nash equilibrium, Bayesian Nash equilibrium and mechanism design. In Chapter 3, we study a non-cooperative game for joint replenishment of multiple firms that operate under an EOQ–like setting. Each firm decides whether to replenish independently or to participate in joint replenishment, and how much to contribute to joint ordering costs in case of participation. Joint replenishment cycle time is set by an intermediary as the lowest cycle time that can be financed with the private contributions of participating firms. We consider two variants of the participation-contribution game: in the single–stage variant, participation and contribution decisions are made simultaneously, and, in the two-stage variant, participating firms become common knowledge at the contribution stage. We characterize the behavior and outcomes under undominated Nash equilibria for the one-stage game and subgame-perfect equilibrium for the two-stage game. In Chapter 4, we extend the private contributions game to an asymmetric information counterpart. We assume each firm only knows the probability distribution of the other firms’ adjusted demand rates (demand rate multiplied by inventory holding cost rate). We show the existence of a pure strategy Bayesian Nash equilibrium for the asymmetric information game and provide its characterization. Finally, we conduct some numerical study to examine the impact of information asymmetry on expected and interim values of total contributions, cycle times and total costs. quantities for all firm types except the type that has the highest possible unit cost, who orders the same quantity as he would as a monopolist newsboy. Consequently, competition leads to higher total inventory in the industry. A firm’s equilibrium order quantity increases with a stochastic increase in the total industry demand or with an increase in his initial allocation of the total industry demand. Finally, we provide full characterization of the equilibrium, corresponding payoffs and comparative statics for a parametric special case with uniform demand and linear market shares.
Open Access
An inventory model for randomly perishing goods
(2000) Yüksel, Banu
In this study, we consider an (s, S) ordering policy with backordering for a continuous review inventory system, where the items have a random shelflife. Assuming zero lead time and no decay until the shelflife, we derive the exact expressions for both unit and random batch demand cases with renewal demand arrivals. We present some analytical results on the cost rate function for unit demand case. A detailed numerical analysis is also provided to investigate the performance of the model which incorporates the random shelflife and comparisons with flxed shelflife are given.
Open Access
Multicriteria ABC classification with AHP method: an application
(1996) Erdinç, Emrah
The traditional ABC classification is an inventory management technique that is applied by many companies in different industries. The method classifies the items in the inventory as class A. B. and C. The classification enables the managers to exert different levels of control on each class according to their importance for the company. Class A is constituted of the most important items and class C is constituted of the least important ones. Class B items have intermediate importance for the company. The Traditional ABC Classification method uses only one criterion in order to classify the items, however management may need to consider multiple criteria. The Multicriteria ABC Classification method provides a solution to this problem. This method also enables the managers to incorporate their judgments into the analysis. In this thesis both the traditional and the multicriteria ABC classification methods are applied to the inventory of a Turkish pharmaceutical company and the results are compared. The Analytic Hierarchy Process (AHP) technique is utilized in order to conduct the multicriteria inventory classification.
Open Access
Robustness of buffer allocation in multi-product multi-batch deterministic flow lines
(1993) Kurucu, A. Akın
Today in industry flow lines are not just for a single end product. There is a stochasticity, such that there are various demand scenarios at hand, to be satisfied by the flow line. The performance of the flow line should not be very sensitive to demand changes. Aim of this study is to develop buffer allocation guidelines to help flow line designers.