Two-stage perishable inventory models

Article Abstract:

Inventory models of perishable goods given two types of demand are examined. The two types of demand are for fresh goods or for somewhat older stock. A two-stage inventory system is modeled wherein the first and second levels hold the fresh and the older items, respectively. A one-moment approximation method which uses first-moment information is considered. This method assumes a Jackson (1963) queueing network, and that all processes are Poisson. A second approximation method is analyzed that accounts for outdate and shrtage process information. Using this second method, single stage models are evaluated given batch Poisson arrival and request processes. Finally, approximation of the performance of a two-stage system given an unrestricted first-in, first-out policy is considered. In this approximation, the first configuration assumes noinventory in the second stage, which, in turn, involves the two-stage inventorysystem.

Management, Inventory control, Perishable goods

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Repetitive testing strategies when the testing process is imperfect

Article Abstract:

A study was conducted to examine repetitive testing strategies in the semiconductor industry when the testing process is flawed. Testing imperfection occurs when items classified as conforming turn out to be nonconforming or when items classified as nonconforming are actually conforming. This research aimed to answer if repeatedly testing rejected items is better than repeatedly testing acceptance items. It also sought to determine the association between the two testing policies, the precision and capacity of testing equipment, and the requirements for incoming and outgoing quality. Findings revealed that retesting accepted items is recommendable only when the testing accuracy is low, the incoming product quality is bad or the outgoing product requires a very low proportion of nonconforming items.

Semiconductors and related devices, Semiconductor Devices, Semiconductor and Related Device Manufacturing, Evaluation, Product quality, Testing, Quality control, Tests, Semiconductors

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Optimal order of servers for tandem queues in light traffic

Article Abstract:

The order of stations that minimizes customer delay is selected using light traffic approximation with various joint distributions of service time. It is assumed that the order of the stations is irrelevant to the quality of service that customers receive. Single server stations are studied simultaneously while customers arrive according to a Poisson process and are served by each of the two servers.

Customer service, Queuing theory, Poisson distribution

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