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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 21, Issue 4 - Dec 1995
Volume 21, Issue 3 - Sep 1995
Volume 21, Issue 2 - Jun 1995
Volume 21, Issue 1 - Mar 1995
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A Study on Modeling of FMS using Closed Queueing Network
Jeong, Seok-Chan ; Cho, Kyu-Kab ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 153~165
Many closed queueing network models have been used as an effective tool to make a preliminary design of FMS. Although a loading/unloading function is an important factor to effect the utilization and throughput of FMS as well as a transfer function and a processing function, the Solberg's model did not clarify the loading/unloading function. In this paper, we propose a closed queueing network model for analyzing a flexible manufacturing system that consists of a load/unload station, a material handling system and a group of workstations for processing jobs, and define the expected utilization and the expected throughput of the FMS. As applications of the proposed model, the cases of a material handling system consisting of a conveyor and the FMS including an inspection station are also formulated.
Estimation of the Expected Time in System of Trip-Based Material Handling Systems
Cho, Myeon-Sig ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 167~181
We develop an analytical model to estimate the time a workpiece spends in both input and output queues in trip-based material handling systems. The waiting times in the input queues are approximated by M/G/1 queueing system and the waiting times in the output queues are estimated using the method discussed in Bozer, Cho, and Srinivasan . The analytical results are tested via simulation experiment. The result indicates that the analytical model estimates the expected waiting times in both the input and output queues fairly accurately. Furthermore, we observe that a workpiece spends more time waiting for a processor than waiting for a device even if the processors and the devices are equally utilized. It is also noted that the expected waiting time in the output queue with fewer faster devices is shorter than that obtained with multiple slower devices.
USEFUL REDUNDANT TECHNIQUES FOR BUILT -IN -TEST RELATED SYSTEM
Yoo, Wang-Jin ; Oh, Hyun-Seung ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 183~194
This research paper describes several possible suggestions which are essential to develop for Built-In-Test(BIT) related systems, such as more precise BIT parameter analysis, sensitivity analysis of the impact of BIT on redundant systems, statistical inference of field data for BIT performance parameters, methods of reducing BIT false alarms, BIT application in industrial automation and remote control, prevent the system from the impact of BIT failure, undetections and false alarms, life cycle cost analysis for BIT. And, it is mainly focused on redundancy technique for solving BIT diagnostic problems. Algorithms for redundant systems : overlapping technique, flexible redundant BITs are presented and case study will be shown based on various experiment.
Travel-Time Analysis for an Automated Mobile Racking System
Lee, Moon-Kyu ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 195~206
Higher utilization of warehouse space can be achieved by using automated mobile racking systems. Therefore, those systems may be employed for factories or distribution centers as a good option of increasing the storage capacity. In this paper, travel-time models are developed to estimate the average performance of the system assuming randomized storage. Expected travel times are determined for both single- and dual-command cycles. Two extreme input/output-point locations are considered. Some numerical results obtained from the models are given.
A Study on the Dynamic Scheduling for Distributed Management Systems
Chung, Nam-Kee ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 207~216
Constructing a distributed management system has its own advantages in addressing the issue of implementing a quick responsive management system in dynamically changing environment of enterprise. We suggest a basic scheduling methodology applicable to a distributed production management system. A new concept of "flexible schedule" is introduced as a tool to accommodate dynamically changing situations of job shops. Then a search technique (referred to as CSP-CBA search) is presented to obtain such a schedule for the job shop scheduling problem, which is converted into a constraint satisfaction problem(CSP), by using the constraint based analysis(CBA). This approach is tested on more than 100 test problems. The results show that the suggested approach required shorter CPU time and solved more problems in given time than another fixed schedule method.
Five-Axis Machining with Three-Axis CNC Machine
Lee, Jung-Jae ; Suh, Suk-Hwan ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 217~237
One of the most distinguished advantages of five-axis machining is that complex free surfaces(such as impeller) can be machined by one setup. Five-axis CNC machine, however, is very expensive so that its usage is restricted to a few large companies. As an economical approach to five-axis machining, this paper presents a method for machining the five-axis free surfaces(using ball-end mill) on a three-axis CNC machine with an index table. The method developed consists of: a) determining the minimum number of part setups and their interference-free and collision-free potential machining area, b) calculating actual machining area for each setup, and c) generating 3-axis cutter path for each part setup. The method has been successfully tested via computer simulations for several complex surfaces including impeller.
Multi-load Automated Storage/Retrieval Systems
Rim, Suk-Chui ; Kim, Yong-Jin ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 239~254
Automated Storage/Retrieval (AS/R) systems have been used mostly in manufacturing or distribution industry in order to store or retrieve palletized items automatically. Since the items ore heavy or bulky, only one pallet at a time is moved by the stacker crane In this study, however, we introduce the "multi -load" AS/R system in which the items to be stored are data storage devices of equal size such as video tape or compact disc. Since the items are small and light multiple items can be stored and retrieved in each trip by using a magazine and a robot arm mounted on the crane Given the magazine capacity, and the locations of retrieval items and empty cells in the rack, the throughput of the multi-load AS/R system will depend on the selection of storage locations and the sequence of visits. We propose four heuristic algorithms for the multi-command. Computer simulation is used to evaluate the four algorithms in terms of throughput and number of back tracking of the crane.
Determination of the Optimal Specification Limits for Complete Inspection Plans
Hong, Sung-Hoon ; Kim, Sang-Boo ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 255~265
Due to advances in automated manufacturing systems and automatic inspection equipment, complete inspection has drown increased attention recently and has become a widespread practice. In a complete inspection plan all of the items are subject to acceptance inspection If an item fails to meet the predetermined specifications, it is rejected. In this paper, economic complete inspection plans are developed in situations where rejected items are reworked Complete inspections based on the performance variable of interest or a variable which is correlated with the performance variable are considered. Cost models are constructed which involve cost incurred by imperfect quality rework cast and quality inspection cost Methods of finding the optimal complete inspection plans are presented and numerical examples are given.
Analysis of Priority Systems with a Mixed Service Discipline
Hong, Sung-Jo ; Hirayama, Tetsuji ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 267~288
We investigate a multiclass priority system with a mixed service discipline, and propose a new approach to the analysis of performance measures (mean waiting times) of the system. Customers are preferentially served in the order of priority. The service discipline at each station is either gated or exhaustive discipline. We formulate mean waiting times as functions on the state of the system. We first consider the system at an arbitrary system state to obtain explicit formulae for the mean waiting times, and then derive their steady state values by using the property of Poisson arrivals to see time averages and the generalized Little's formula.
Balancing / Unbalancing in General Queueing Networks with Multi-Server Stations
Kim, Sung-Chul ;
Journal of Korean Institute of Industrial Engineers, volume 21, issue 2, 1995, Pages 289~298
We consider a general queueing network with multi-server stations. The stations are under heavy traffics or moderate variable conditions. We develope an algorithm to determine the optimal loading policy, which minimizes the congestion in a network. Under more specified condition, majorization and arrangement orderings are established to compare, respectively, various loading and assignment policies. Implications of results are also discussed.