18、al-process parameters. Once the congestion in each queue has been described, the total network performance can be approximated by acting as if all the queues are mutually independent, i.e., the rest of the approximation is performed as if the steady-state distribution of the numbers of customers at。

19、hte queues had a product form 18. In the proposed approach, the whole chain is decomposed into multiple single-stage multi-class inventory queues (an inventory-queue is a queueing model that incorporates certain inventory replenishment policies such as base stock). The inputs (raw materials or compo 。

20、nents arrival processes) of each single-stage multi-class inventory queue are used to capture the characteristics of input flows of the original chain.The rest of the paper is organized as follows. Section 2 provides a review of the relevant literature. In Sect. 3, the operations and the principal c 。

21、haracteristics of the developed model are described. A decomposition method that divides the whole logistics chain into multiple single-stage queuing networks is proposed and the performance measures by analyzing the single-stage queueing network are obtained in Sect. 4. Section 5 presents some nume 。

22、rical results. Section 6 summarizes this research and gives some future research directions. 2 Literature reviewSignificant literature exists on inventory management in logistics chains. In the following, some prior studies devoted to the issues which are similar to the above described problems are。

23、reviewed. Some important work on single-product multi-stage systems is reviewed. Lee and Zipkin 11, 12 and Duri et al. 9 used the decomposition method to analyze the tandem queues and processing networks. They transformed the production system into a multi-echelon model with limited production capac 。

24、ities. Azaron et al. 3 developed an open queueing network for multi-stage assemblies in which each service station represents a manufacturing or assembly operation. In the proposed model, not only the manufacturing and assembly processing times are considered as the functions of the arrival and serv 。

25、ice rates of the various stages of the manufacturing process, but also the role of transport times between the service stations in the manufacturing lead time is considered. An assumption is that the arrival processes of the individual parts of the product are independent Poisson processes with equa 。

26、l rates. In each service station, there is a server with exponential distribution of processing time. The transport times between the service stations are assumed to be independent random variables with exponential distributions. By applying the longest path analysis in queueing networks, the distri 。

27、bution function of time spent by a product in the system or the manufacturing lead time can be obtained. The study in this paper is more similar to Liu et al. 13. They developed a multi-stage inventory queue model and a job-queue decomposition approach that evaluates the performance of serial manufa 。

28、cturing and supply chain systems with inventory control at every stage. In this paper, the proposed method decomposes a queue at each stage into two components, a backlog queue and a material queue. Instead of the single type product queues in their model 13, the queues contain a multi-class of item 。

29、s in the proposed model. The purpose of this paper is threefold: (1) To provide an integrated modeling framework for manufacturing logistics chains in which the interdependencies between model components are captured;
(2) To develop a network of inventory-queue models for performance analysis of an。

30、integrated logistics chain with inventory control at all sites;
and (3) To extend the previous work developed for a supply network model with base-stock control and service requirements. Instead of a single type product produced at each stage with infinite capacity, the problem of multiple types of。

31、products produced at each stage with finite capacity is considered.3 An integrated modeling framework for logistics chainsLogistics chains may differ in the network structure (serial, parallel, assembly and arborescent distribution), product structure (levels of bill-of-materials), transportation mo 。

32、des, and degree of uncertainty that they face. However, they have some basic elements in common 8.3.1 Sites and stores A logistics chain can be viewed as a network of functional sites connected by different material flow paths. Generally, there are four types of sites: (1) Supplier sites which procu 。

33、re raw materials from outside suppliers;
(2) Fabrication sites which transform raw materials into components;
(3) Assembly sites which assemble the components into semi-finished products or finished goods;
and (4) Distribution sites which deliver the finished products to warehouses or customers. All 。

稿源：(未知)

【傻大方】网址：/a/2021/0621/0022536388.html

标题：结合多级排队网络和库存模型用于多产品生产物流链的性能分析|结合多级排队网络和库存模型用于多产品生产物流链的性能分析毕业论文外文翻译( 二 )