
Operations Research Proceedings 2005
Description
Alles über E-Books | Antworten auf Fragen rund um E-Books, Kopierschutz und Dateiformate finden Sie in unserem Info- & Hilfebereich.
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.
More details
Other editions
Additional editions

Content
Allen H. Tai and Wai-Ki Ching
Department of Mathematics, The University of Hong Kong, Pokfulam Road, Hong Kong, China. h0150695@graduate.hku.hk, wkc@maths.hku.hk
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.
System requirements
File format: PDF
Copy protection: Watermark-DRM (Digital Rights Management)
System requirements:
- Computer (Windows; MacOS X; Linux): Use the free software Adobe Reader, Adobe Digital Editions, or any other PDF viewer of your choice (see eBook Help).
- Tablet/Smartphone (Android; iOS): Install the free app Adobe Digital Editions or another reading app for eBooks, e.g., PocketBook (see eBook Help).
- E-reader: Bookeen, Kobo, Pocketbook, Sony, Tolino and many more (only limited: Kindle).
The file format PDF always displays a book page identically on any hardware. This makes PDF suitable for complex layouts such as those used in textbooks and reference books (images, tables, columns, footnotes). Unfortunately, on the small screens of e-readers or smartphones, PDFs are rather annoying, requiring too much scrolling.
This eBook uses Watermark-DRM, a „soft” copy protection. This means that there are no technical restrictions to prevent illegal distribution. However, there is a personalised watermark embedded in the eBook that can be used to identify the purchaser of the eBook in the event of misuse and to provide evidence for legal purposes.
For more information, see our eBook Help page.