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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Institute of Industrial Engineers
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Korean Institute of Industrial Engineers
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Volume & Issues
Volume 15, Issue 2 - Dec 1989
Volume 15, Issue 1 - Jun 1989
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An Analysis of Operating Policies for Multi-Product Unit Load AS/RS
Park, Yang-Byeong ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 1~15
In the past few years, increasing numbers of automatic storage/retrieval system (AS/RS) using computer controlled storage/retrieval machine have been installed. This paper introduces two modeling approaches to determine the best operating policy for AS/RS : an M/G/1 queueing model and a computer simulation model. The operating policy consists of three elements. : the operation command cycle, the storage location method, and the operation dispatching rule. The analysis based on M/G/1 model is suitable for a quick and approximate evaluation, due to its inherent strict assumptions. The computer simulation can be used to perform a more realistic analysis. It is shown through the study that a significant improvement in the throughput and/or the space requirement can be expected by determining the best operating policy to a particular system. Most important, the computer simulation demonstrates its powerful capability in evaluating dynamic stochatic systems with imperfect information.
Economic Order Quantities with Quantity Discounts Based on Package Unit
Kim, Gap-Hwan ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 17~21
The problem to determine Economic Order Quantity(EOQ) occurs when price discounts or uncharged additions are offered for the purchase in the unit of package. It is found that the annual inventory cost needs to be evaluated for at most three alternative order sizes to find EOQ, which is easier than the case of all-unit or incremental quantity discount. Numerical examples are presented.
A Study on Information Flow and Routing in a Class of Flexible Manufacturing Systems
Kim, Sung-Chul ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 23~30
The routing flexibility in FMSs can be achieved through two levels : the parallel operations and the alternative stations. To accommodate this pertaining flexibility for part routing in FMSs, a hierarchical routing principle is developed which considers both the routing flexibility and the performance effectiveness, which can also be easily implemented. For the proper implementation of this routing algorithm, the required information flow is identified which turns out to be very simple.
Machine Layout Problem in a Production Line
Han, Min-Hong ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 31~39
The throughput of a production line can be improved by a proper layout of machines and also by meterial flow control between machines. This paper presents a heuristic method of determining machine layout in one-dimensional space to reduce travel distance of material transporters. The heuristic method is compared to an optimum solution method to measure its performance.
Density-Order Index Rule for Stock Location in a Distribution Warehouse
Hwang, Hark ; Cha, Chun-Nam ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 41~50
This paper deals with the problem of space allocation of items within a warehouse. Recognizing the importance of weights associated with material handling, mathematical models are developed for two cases, out-and-back selection and storage retrieval interleaving. It is proved that the density order index rule we proposed generates an optimal solution for the first model. An example problem solved with the pairwise interchange method indicates that the rule is also fairly efficient for the second model. The proposed rule is compared with other assignment rules of warehouse space such as COI rule, space and popularity.
Optimal Software Release Policies under Increasing Error Correction Cost
Bae, Do-Seon ; Yun, Won-Yeong ; Lee, Yeong-Bong ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 51~63
This paper considers software release problems based on Goel-Okumoto and S-shaped reliability growth models. Test of the software system is terminated after a preassigned time T, and it is released to the operational phase. It is assumed that correction cost of an error is increasing with test or operation time. Optimum software release time is obtained using total expected cost on the software life time as a criterion for optimization. In addition, optimal software release policies under the constraint of a software reliability requirement are discussed.
The Workload Distribution Problems in a Class of Flexible Manufacturing Systems
Kim, Sung-Chul ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 65~75
This study complements the previous studies on workload distribution problems in Flexible Manufacturing Systems. Specifically, we consider the problem in two perspectives, the long-range policy and the short and medium-term planning and control. The long-term loading policy focusses on identifying the optimal loading of the system characterized by either balanced loading or unique unbalanced loading for which a steepest ascent method is developed. These results are then applied to study the optimal medium and short-term planning and control problems, for which a truncated dynamic programming method is developed in order to obtain the optimal allocation of the given operation mix of part types to work stations.
Travel Time Modeling and Analysis for an Automated Work-in-process Carousel
Lee, Moon-Kyu ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 77~87
This paper deals with an automated storage carrousel which handles work-in-process(WIP) such as small parts for kitting. The system has been used predominately for order picking applications. Throughput performance of the system can be measured by the inverse of the expected order picking time. Analytic models are developed for approximating the expected times under the "nearest-item" sequencing rule. The performance of the models are tested through computer simulation. The gap between the two is shown to be reasonably small.
The Average Outgoing Quality of CSP's for Markov-Dependent Production Processes in Short Production Runs
Park, Heung-Seon ; Kim, Seong-In ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 89~103
In this paper the approximate average outgoing quality and properties of a class of continuous sampling plans in a short production run are investigated when the quality of successive units follows a two-state time-homogeneous Markov chain. The results of previous studies can be obtained as special cases. It is observed that the long-run average outgoing quality limit values under the statistical control differ significantly as compared to the case of short production runs in a Markov-dependent production process.
A Study on Determining the Optimal Configuration of the FMS with Limited Local Buffers
Jeong, Yang-Geun ; Kim, Seong-Sik ; Jang, Dong-Sik ;
Journal of Korean Institute of Industrial Engineers, volume 15, issue 1, 1989, Pages 105~116
This study presents an algorithm that determines the optimal configuration of the FMSs with limited local buffers. The algorithm finds the lowest cost configuration, i.e. the number of tools, the number of pallets as well as the number of buffers to be installed in front of each machine in the system. Thus it assures a given production ratio with a minimum cost. In the algorithm, FMSs are considered as the closed queueing network with limited queue length. System performance evaluation is performed using the Block-&-Recirculation model developed by Yao and Buzacott. The algorithm is composed with three steps. The steps are namely i) determination of a lower configuration, ii) derivation of an heuristic solution, and iii) obtaining the optimal solution. The computational efforts required in the algorithm usually lies within the capability of personal computers.