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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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Journal DOI :
Korean Institute of Industrial Engineers
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Volume & Issues
Volume 24, Issue 4 - Dec 1998
Volume 24, Issue 3 - Sep 1998
Volume 24, Issue 2 - Jun 1998
Volume 24, Issue 1 - Mar 1998
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Group Control Charts with Variable Stream and Sample Sizes
Lee, K.T. ; Bai, D.S. ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 333~343
This paper proposes variable stream and sample size(VSSS) group control charts in which both the number of streams selected for sampling and sample size from each of the selected streams are allowed to vary based on the values of the preceding sample statistics. The proposed charts select a small portion of streams and take samples of size n = 1 if both the largest and smallest of sample means fall between the lower and upper threshold limits, and select a large portion of streams and take samples of size n > 1 otherwise. A Markov chain approach is used to derive the formulas for evaluating the performances of the proposed charts. Numerical comparisons are made between the VSSS and fixed stream and sample size(FSSS) group control charts.
Algorithms for Production Planning and Scheduling in an Assembly System Operating on a Make-to-Order Basis
Park, Moon-Won ; Kim, Yeong-Dae ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 345~357
This paper focuses on production planning and scheduling problems in an assembly system operating on a make-to-order basis. Due dates are considered as constraints in the problems, that is, tardiness is not allowed. Since the planning problem is a higher-level decision making than the scheduling problem, the scheduling problem is solved using a production plan obtained by solving the planning problem. We suggest heuristic procedures in which aggregated information is used when the production planning problem is solved while more detailed information is used when the scheduling problem is solved. Since a feasible schedule may not be obtained from a production plan, an iterative approach is employed in the two procedures to obtain a solution that is feasible for both the production planning and scheduling problems. Computational tests on randomly generated test problems are done to show the performance of these algorithms, and results are reported.
Economic Design of a Process Monitoring Procedure for Dichotomous Performance Variable under 100% Inspection
Kwon, Hyuck-Moo ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 359~365
An economic process monitoring procedure is presented when the major quality characteristic of the item is dichotomous. Every item is inspected and decided whether it is conforming or not. If an item is found to be nonconforming, the previous number of the successive conforming items is compared with a predetermined number r to check the process for existence of any assignable cause of variation. A cost model is constructed on the basis of costs of inspection, illegal signal, undetected out-of-control state and corrective action. By minimizing the expected total cost per unit time, the optimal value of r is obtained. The effects of cost coefficients are studied numerically.
Optimal Designs of Partially Accelerated Life Tests for Weibull Distributions
Chung, Sang-Wook ; Bai, Do-Sun ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 367~379
This paper considers two modes of partially accelerated life tests for items having Weibull lifetime distributions. In a use-to-acclerated mode each item is first run at use condition and, if it does not fail for a specified time, then it is run at accelerated condition until a predetermined censoring time. In an accelerated-to-use mode each one is first run at accelerated condition and, if it does not fail for a specified time, then it is run at use condition. Maximum likelihood estimators of the parameters of the lifetime distribution at use condition, and the 'acceleration factor' are obtained. The stress change time for each mode is determined to minimize the asymptotic variance of the acceleration factor, and the two modes are compared. For selected values of the design parameters the optimum plans are obtained, and the effects of the incorrect pre-estimates of the design parameters are investigated. Minimizing the generalized asymptotic variance of the estimators of the model parameters is also considered as an optimality criterion.
A Note on Common Mistakes about Stopped Random Sums Arising in Queueing Models
Chae, Kyung-C. ; Park, Hyun-M. ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 381~386
We frequently encounter stopped random sums when modelling queueing systems. We also notice occasional mishandling of stopped random sums in the literature. The purpose of this note is to prevent further mistakes by identifying and correcting typical mistakes about stopped random sums. As an example model, we use the two-phase M/G/1 queue with multiple vacations.
An Algorithm to Determine the Spare Inventory Level for Repairable-Item Inventory System with Depot Spares
Kim, Jong-Soo ; Hur, Sun ; Shin, Kyu-Chul ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 387~396
We consider the problem of determining the spare inventory level for a multiechelon repairable-item inventory system. Our model extends the previous results to the system which has an inventory at the central depot as well as at the several bases. We develop an algorithm to find spare inventory levels, which minimize the total expected cost and simultaneously satisfies a specified minimum service level. Comparisons of our algorithm with the simulation show that the algorithm is very accurate and efficient.
Real Time Engine Quality Inspection System by Image Processing
Jung, Won ; Shin, Hyun-Myung ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 397~406
The purpose of this research is to develop an integrated quality inspection system using machine vision technology in the automotive engine assembly process. The system makes it possible for the inspected data to be entered directly from the machine vision system into the developed system without the need for intermediate operations. Such direct entry enables prompt corrective actions against process problems. An IVP-150 machine vision board is installed an the PC for image processing, and a template matching technology is implemented to precisely verify quality factors. The developed system is successfully installed in a manufacturing process, and it showed robustness to the problems of noise, distortion, and orientation.
Minimum Deficiency Ordering with the Clique Storage Structure
Seol, Tong-Ryeol ; Park, Chan-Kyoo ; Park, Soon-Dal ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 407~416
For fast Cholesky factorization, it is most important to reduce the number of nonzero elements by ordering methods. Generally, the minimum deficiency ordering produces less nonzero elements, but it is very slow. We propose an efficient implementation method. The minimum deficiency ordering requires much computations related to adjacent nodes. But, we reduce those computations by using indistinguishable nodes, the clique storage structures, and the explicit storage structures to compute deficiencies.
Two-sided assembly line balancing using a branch-and-bound method
Kim, Yeo-Keun ; Lee, Tae-Ok ; Shin, Tae-Ho ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 417~429
This paper considers two-sided (left and right side) assembly lines which are often used, especially in assembling large-sized products such as trucks and buses. A large number of exact algorithms and heuristics have been proposed to balance one-sided lines. However, little attention has been paid to balancing two-sided assembly lines. We present an efficient algorithm based on a branch and bound for balancing two-sided assembly lines. The algorithm involves a procedure for generating an enumeration tree. To efficiently search for the near optimal solutions to the problem, assignment rules are used in the method. New and existing bound strategies and dominance rules are else employed. The proposed algorithm can find a near optimal solution by enumerating feasible solutions partially. Extensive computational experiments are carried out to make the performance comparison between the proposed algorithm and existing ones. The computational results show that our algorithm is promising and robust in solution quality.
Dynamic Programming Algorithms for Scheduling Jobs with Sequence-Dependent Processing Times
Lee, Moon-Kyu ; Lee, Seung-Joo ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 431~446
In this paper, we consider the problem of scheduling n jobs with sequence-dependent processing times on a set of parallel-identical machines. The processing time of each job consists of a pure processing time and a sequence-dependent setup time. The objective is to maximize the total remaining machine available time which can be used for other tasks. For the problem, we first propose a dynamic programming(DP) algorithm for sequencing jobs processed on a single machine. The algorithm is then extended to handle jobs on parallel-identical machines. Finally, we developed an improved version of the algorithm which generates optimal solutions using much smaller amount of memory space and computing time. Computational results are provided to illustrate the performance of the DP algorithms.
Development of a Upper Body Micropostural Classification Scheme Based on Perceived Joint Discomfort
Kee, Do-Hyung ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 447~455
It is important to identify and evaluate poor working postures properly to prevent work-related musculoskeletal disorders. The purpose of this study is to develope a new upper body micropostural classification scheme for analyzing postural stress in industry. Most of the existing postural classification schemes were based either on the literature, or on simple biomechanical principles, or on a subjective ranking system. The scheme suggested in this study was based on perceived joint discomfort measured through experiment, in which nineteen subjects participated and the magnitude estimation method was employed to obtain subjects' joint discomfort. Also, the criteria for evaluating postural stress of working postures were presented for practitioners of health and safety to be able to redesign working methods and workplaces, which was based on maximum holding time by Miedema and other people. It is expected that the scheme developed in this study could be used as a valuable tool when evaluating working postures.
The Object-Oriented Design of the Product Structure Based on Options
Ko, Suk-Wan ; Kim, Sunn-Ho ; Jeong, Seok-Chan ;
Journal of Korean Institute of Industrial Engineers, volume 24, issue 3, 1998, Pages 457~473
As a product structure or BOM(bill of material) of products is hierarchically structured, the design based on the concept of relational data base modeling causes low performances in data search or processing. For this reason, an object-oriented approach to designing a product structure is proposed in this paper. Using Rumbaugh's OMT (Object Modeling Technique) method, classes of parts, BOM structure, options, and models are defined and their class-relationship diagrams are proposed. For the representation of the BOM structure suitable for the object-oriented paradigm, a new data architecture called the BOM item class is suggested. It is expected that the proposed data structure ensures better reusability and expandability due to the modularity.