Generally ordering policies are done by two methods, including fix order quantity (FOQ) and fix order period (FOP). These methods are static and either the quantity of ordering or the procedure of ordering is fixing in throughout time horizon. In real environments, demand is varying in any period and may be considered as uncertainty. When demand is variable in any period, the traditional and st...

This paper describes the impact of two different information sharing strategies – decentralized and centralized information – combined with two inventory control policies – min-max and stock-to-demand inventory control – on the bullwhip effect. To investigate and measure this impact, simulation models are developed using the Arena 5.0 software package for a four-stage supply chain, consisting o...

We derive stationary distributions of joint queue length and inventory processes in explicit product form for various M/M/1-systems with inventory under continuous review and different inventory management policies, and with lost sales. Demand is Poisson, service times and lead times are exponentially distributed. These distributions are used to calculate performance measures of the respective ...

A multi-item model of a production-inventory system incorporating deterioration, shortages and capacity/budge constraints is considered. An optimal control policy for the model is developed using linear quadratic (LQ) theory for the case of deterministic demands. The problem of controlling large-scale production-inventory facilities is also considered, and the interaction prediction method is u...

We have considered a distribution inventory system with one warehouse and several retailers. Customer demand arrives at the retailers and the material flow between echelons is driven by reorder point/order quantity inventory control policies. Our objective is to calculate the long-run inventory statistics. The challenge in this system is to characterize the demand arrival process at the warehou...

A set of neural networks is employed to develop control policies that are better than fixed, theoretically optimal policies, when applied to a combined physical inventory and distribution system in a nonstationary demand environment. Specifically, we show that model-based adaptive critic approximate dynamic programming techniques can be used with systems characterized by discrete valued states ...

This paper makes use of a database of Spanish manufacturing firms to explore the effect of a firm’s ownership structure on its inventory policy. We have argued that the presence of institutional investors reduces a firm’s liquidity needs and nts overinvestment policies. This, in turn, leads to lower equilibrium inventory levels. Also, we expect, on average, ventory investment when bank-equity f...

This article considers the deterministic singular optimal control problem of profit maximisation for inventory replenished at a variable rate and depleted by demand which is assumed to vary with price and stock availability. Optimal policies for the product order rate and price are derived using the maximum principle. Several initial inventory regions are identified as potential inventory state...

An inventory scheduling model with forbidden time intervals is analyzed The objective is to minimize the long term average cost per time unit Unlike most of the literature on inventory theory no restrictive assumptions are made apriori about the nature of optimal solutions It is rather proved that optimal policies exist and that some of them are cyclic with cycles of a particular structure It i...