In this paper we consider a single item, discrete time, lot sizing situation where demand is random and its parameters (e.g., mean and standard deviation) can change with time. For the appealing criterion of minimizing expected total relevant costs per unit time until the moment of the next replenishment we develop two heuristic ways of selecting an appropriate augmentation quantity beyond the ...

T article studies a single-location inventory model with random leadtimes. Inventory is replenished by a single supplier who, at the time a replenishment order is received, knows exactly when the order will be delivered. In other words, the supplier knows the leadtime for every replenishment order. Suppose the singlelocation inventory system is managed by a retailer. The objective of this artic...

Advance Demand Information can improve the performance of production/inventory systems with random demand considerably. However, to exploit the potential of such information, replenishment policies must be adapted to the available information. We explore the impact and the benefits of Advance Demand Information under optimal replenishment policies for two different supply chain structures, one ...

The advent of e-commerce has prompted many manufacturers to redesign their traditionalchannel structure by engaging in direct sales. In this paper, we present a dual channel inventory modelbased on queuing theory in a manufacturer-retailer supply chain, consisting of a traditional retailchannel and a direct channel which stocks are kept in both upper and lower echelon. The systemreceives stocha...

EPQ model; Replenishment lot size; Multiple deliveries; Random defective items; Production; Rework; Scrap items. Abstract This paper derives the optimal replenishment lot size and shipment policy for an Economic Production Quantity (EPQ) model with multiple deliveries and rework of random defective items. The classic EPQmodel assumes a continuous inventory issuing policy for satisfying demand a...

Advance demand information, when used effectively, improves the performance of production/inventory systems. The extent of improvement however depends on certain factors. We investigate the influence of random supply lead times on a single-stage inventory system with advance demand information. It is found that the supply lead time variability diminishes the benefits of advance demand information.

Supply chain coordination has received substantial attention in the operations literature in recent years. Coordination issues in supply chains arise due to several factors, an important one being the difference in the cost impact of inventory and replenishment decisions on the manufacturer and retailer. In this paper, we address this asymmetry in cost impact that can lead to sub-optimal channe...

In this paper, an extended economic production quantity (EPQ) model is investigated, where demand follows a random process. This study is motivated by an industrial case for precision machine assembly in the machinery industry. Both a positive resetup point s and a fixed lot size Q are implemented in this production control policy. To cope with random demand, a resetup point, i.e., the lowest i...