Haasis / Kopfer / Schönberger Operations Research Proceedings 2005

Selected Papers of the Annual International Conference of the German Operations Research Society (GOR)
1. Auflage 2006
ISBN: 978-3-540-32539-0
Verlag: Springer
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, Band 2005, 822 Seiten, eBook

Reihe: Operations Research Proceedings

This volume contains a selection of 128 papers presented in lectures during the international scientific symposium "Operations Research 2005" (OR 2005) held at the University of Bremen, September 7-9, 2005. This international conference took place under the auspices of the German Operations Research Society (GOR).The symposium had about 600 participants from countries all over the world. It attracted academics and practitioners working in various fields of Operations Research and provided them with the most recent advances in Operations Research as well as related areas in Economics, Mathematics, and Computer Science including the special interest streams Logistics and New Maritime Businesses.The program consisted of 3 plenary and 15 semi-plenary talks and about 400 contributed presentations selected by the program committee to be presented in 20 sections.

Zielgruppe

Research

Autoren/Hrsg.

Haasis, Hans-Dietrich

Kopfer, Herbert

Schönberger, Jörn

Inhaltsverzeichnis

Dissertation Award of the GOR.- Diploma Award of the GOR.- Logistics.- New Maritime Businesses.- Production & Supply Chain Management.- Finance, Banking and Insurance.- Artificial Intelligence and Fuzzy Logic.- Discrete and Combinatorial Optimization.- Routing and Networks.- OR Applications in Health and Life Sciences.- Continuous Optimization.- Econometrics, Game Theory and Mathematical Economics.- e-Business and Computer Sciences.- Sustainable Systems.- Revenue Management.- Marketing.- Managerial Accounting.- Tourism, Entertainment and Sports.- Scheduling and Project Management.- Technology and Innovation.- Decision Theory.- Applied Probability.

Leseproben

A Two-echelon Model for Inventory and Returns ( p. 131)

Allen H. Tai and Wai-Ki Ching

Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong, China. [e-mail], [e-mail]

Summary.

We consider an Markovian model for a two-echelon inventory/return system. The system consists of a supply plant with in.nite capacity and a central warehouse for inventory and returns. There is also a number of local warehouses which are also able to re-manufacture products. To obtain a high service level of handling inventory and returns, lateral transshipment of demands is allowed among the local warehouses.

1 Introduction

The efficiency of product/service delivery is one of the major concerns in many industries including re-manufacturing industry. Since customers are usually scattered over a large regional area, a network of locations (local warehouses) for inventory of products and handling of returns is necessary to maintain a high service level. In our study, Lateral Transshipment (LT) is allowed among the local warehouses to enhance the service level. LTs are also very practical in many organizations having multiple locations linked by computers.

Substantial savings can be realized by the sharing of inventory in the local warehouses [15]. A number of research publications have been appeared in this area. Kukreja et. al [9] developed a single-echelon and multi-location inventory model for slow moving and consumable products. Moinzadeh and Schmidt [12] studied the emergency replenishment for a single-echelon model with deterministic lead times.

Aggarwal and Moinzadeh [2] then extended the idea to a two-echelon model. Ching [5] considered a multi-location inventory system where the process of LT is modelled by Markov-modulated Poisson Process (MMPP). Both numerical algorithm and analytic approximation have been developed to solve the steady-state probability distribution of the system [5, 8]. Lee [10] and Axsäter [3] considered a two-echelon system in which the local warehouses are grouped together. Within the group, the warehouses were assumed to be identical.

Simulation study of a two-echelon system can also be found in [14]. Alfredsson and Verrijdt [1] considered a two-echelon inventory system for service parts with emergency supply options in terms of LT and direct delivery. In this paper, we consider an inventory/returns model based on the framework and analysis discussed in [1, 10].

The model of the system consists of a supply plant with infinite capacity, a central warehouse and a number of local warehouses with re-manufacturing capacity. Here we consider a queueing model for a two-echelon inventory system. Queueing model is a useful tool for many inventory models and manufacturing systems [4, 5, 7, 8].

2 The Two-echelon System

In this section, we present a two-echelon system based on the framework discussed in [1, 10]. The system consists of a supply plant with infinite capacity, a central warehouse (maximum capacity C) and n identical local warehouses (each has a capacity of L), see Fig. 1.