In this paper, we consider a serial two-echelon periodic review inventory system with two supply modes at the most upstream stock point. As control policy for this system, we propose a natural extension of the dual-index policy, which has three base-stock levels. We consider the minimization of long run average inventory holding, backlogging, and both per unit and fixed emergency ordering costs...

We consider a stock point for expensive, low-usage items that is operated by multiple decision makers. Each faces a Poisson demand process, and the joint stock point is controlled by a continuous-review base stock policy with full backordering. We consider penalty costs for backorders and holding costs for stock on hand. For this model, we derive structural properties of the resulting cost func...

Knowledge-refinement is a central problem in the field of expert systems. For rule-based systems, refinement implies the addition, deletion and modification of rules in the system so as to improve the system’s overall performance. The goal of this research effort is to understand the methodology for refining large rule-based systems, as well as to develop tools that will be useful in refining s...

This study aims to determine the application of Good Mining Practice at PT. Bale Mountain. activities Gunung consist processes: Stripping and Top Soil Management, Production Operations, Stock Pile Activities, Quality Control Transportation Consumers. The methodology used is a Practice. Data information are processed tabulated for later analysis descriptively quantitatively. results showed that ...

PURPOSE OF REVIEW This review is designed to aid general pediatricians as they assess cases of possible child maltreatment. The authors have selected salient articles that inform the daily practice of any professional involved in assessing child abuse. RECENT FINDINGS The incidence of child abuse continues to decline in the United States, although a large number of children still suffer from ...

We study the optimal policy for a serial inventory system under periodic review when excess demand at the retailer (i.e., the most downstream stage) is lost. We focus on “high service level environments” (i.e., systems where the cost of a lost sale is high compared to inventory holding costs). These environments are typical of products whose margins are high relative to their holding costs. Whe...

In this paper, we consider a single-stage manufacturing system with one machine, which makes a single product to stock to satisfy random demand. Customers inter-arrival times and production times are all exponential random variables. In order to represent customer impatience behavior caused by backlog, we employ a balking function, which is an arbitrary non-decreasing function of the backlogged...