This paper considers a multistage serial inventory system with Markov-modulated demand. Random demand arises at Stage 1, Stage 1 orders from Stage 2, etc., and Stage N orders from an outside supplier with unlimited stock. The demand distribution in each period is determined by the current state of an exogenous Markov chain. Excess demand is backlogged. Linear holding costs are incurred at every...

We make a novel connection between an energy-efficient wireless transmission scheduling problem and a multi-period, multi-item inventory control problem with stochastic convex ordering costs, deterministic demands, and a joint budget constraint. In the special case of a single item, we show that a state-dependent modified base-stock policy is optimal when the stochastic ordering costs are linea...

Missing value is an unavoidable problem when dealing with real world data sources, and various approaches for dealing with missing data have been developed. In fact, it is very important to consider the imputation ordering (ordering means which missing value should be imputed at first with the help of a specific criterion) during the imputation process, because not all attributes have the same ...

In this work, we consider a continuous-time inventory system where the demand process follows an inventory-dependent diffusion process. The ordering cost of each order depends on quantity and is given by general function, which not even necessarily continuous monotone. By applying lower bound approach together with comparison theorem, show global optimality (s,S) policy for ergodic control prob...

the planning of production and control of inventory problem is one of most important problems that companies are face with them. some times inattention to uncertainty in these problems causes to increase of costs of inventory control systems. one of the important ways encountering to uncertainty is the widespread of fuzzy sets instead of crisp numbers because in this approach, we can determine ...

Assume that the elements of a finite set N are to be ordered and that some associated precedence costs, {cij : i, j ∈ N, i = j}, are given. For any ordering of the elements of N and any pair of elements i, j ∈ N , whenever i is placed prior to j, one incurs a cost cij . Otherwise, a cost cji is incurred. The Linear Ordering Problem (LOP) is to find an ordering of the elements of N where the tot...

supply chain management is a set of guidelines for integration of chains, which aims to reduce costs and increase system services to customers. one of the most important issues for supply chain stockholders is procuring and purchasing requested items in a timely manner. thus, a variety of models have been proposed as purchasing strategy in supply chains. group purchasing is a system which leads...

This study analyzes an inventory control problem of a company in stochastic demand environment under carbon emissions regulations. In particular, a continuous review inventory model with multiple suppliers is investigated under carbon taxing and carbon trading regulations. We analyze and compare the optimal (Q,R) policies with order splitting under two ordering policies: sequential ordering and...

BACKGROUND The economic consequences of interventions to promote rational, evidence-based use of laboratory tests by physicians are not yet fully understood. We evaluated the cost consequences of a computer-based, guideline-driven decision-support system (CDSS) for ordering blood tests in primary care. METHODS We installed the CDSS in 118 practices [159 general practitioners (GPs)] throughout...