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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 36, Issue 4 - Dec 2010
Volume 36, Issue 3 - Sep 2010
Volume 36, Issue 2 - Jun 2010
Volume 36, Issue 1 - Mar 2010
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Comparison of Reliability Estimation Methods for One-shot Systems Using Accelerated Life Tests
Son, Young-Kap ; Jang, Hyun-Jung ;
Journal of Korean Institute of Industrial Engineers, volume 36, issue 4, 2010, Pages 212~218
This paper shows accuracy comparison results of reliability estimation methods for one-shot systems with respect to sample sizes. To compare accuracy in reliability estimation methods, quantal-response data, characterizing one-shot systems, were simulated using failure times of LED obtained through the accelerated life test, and then the true reliability over time was evaluated using the failure times. The simulated quantal-response data were used to estimate the true reliability through applying reliability estimation methods in open literature. Accuracy of each reliability estimation method was compared in terms of both SSE (Sum of Squared Error) and MSE (Mean Squared Error), and then estimation trend for each method is found. Feasible bounds which true reliability would exist within were estimated through applying the found trends to quantal-response data set of a real weapon system.
A Study on Project Scheduling under Multiple Resource Constraints
Lee, Jeong-Hun ; Kim, Pan-Sool ; Moon, Il-Kyeong ;
Journal of Korean Institute of Industrial Engineers, volume 36, issue 4, 2010, Pages 219~229
The PERT/CPM are considered as the base procedures for the most successful project scheduling programs. Unfortunately, it is not easy to apply these procedures to real-life projects. This is due to the fact that PERT/CPM assume an infinite number of resources for each activity in project networks. Obviously, the completion time under no constraints is less than when constraints are imposed. One way of approaching this problem is to use heuristic solution techniques. In this paper, we present three heuristics; MRU (Maximum Resource Use) rule, STU (Shortest Time Use) rule, MRUP (Max Resource Use and Period) rule for allocating resources to activities of projects under multiple resource constraints. Comparisons of the project durations show that these heuristic rules are superior to AG3 rule that has been widely used in practice (Elsayed and Boucher, 1994).
Ubiquitous Computing Technology Based Environmental Monitoring and Diagnosis System : Architecture and Case Study
Yoon, Joo-Sung ; Hwang, Jung-Min ; Suh, Suk-Hwan ; Lee, Chang-Min ;
Journal of Korean Institute of Industrial Engineers, volume 36, issue 4, 2010, Pages 230~242
In this paper, an environmental monitoring and diagnosis system based on ubiquitous computing technology, shortly u-Eco Monitoring System, is proposed. u-Eco Monitoring System is designed to: 1) Collect information from the manufacturing processes via ubiquitous computing technology, 2) Analyze the current status, 3) Identify the cause of problem if detected by rule-based and case-based reasoning, and 4) Provide the results to the operator for proper decision making. Based on functional modeling, a generic architecture is derived, followed by application to a manufacturing system in iron and steel making industry. Finally, to show the validity of the proposed method, a prototype is developed and tested. The developed methods can be used as a conceptual framework for designing environmental monitoring and diagnosis system for industrial practices by which monitoring accuracy and response time for abnormal status can be significantly enhanced, and relieving operator pressure from manual monitoring and error-prone decision making.
Quality Control with Tolerance Analysis
Lee, Jang-Yong ;
Journal of Korean Institute of Industrial Engineers, volume 36, issue 4, 2010, Pages 243~247
Every products, which made by mass production, is not identical in their size but have variations in some intervals specified by tolerance dimensions. Tolerances play major role in standardization of part and its quality, and also make a huge impact on manufacturing cost. The optimal condition for tolerances is giving the values as loose as possible for low production cost while satisfying quality specification, which usually demand tight control of tolerances. Tolerance analysis is necessary to get an optimal solution for this conflict situation. This paper have studied tolerance analysis for universal joint assembly of vehicle steering system and tried to find useful results of the study for product design and quality control.
Parallel Machines Scheduling with GoS Eligibility Constraints : a Survey
Lim, Kyung-Kuk ;
Journal of Korean Institute of Industrial Engineers, volume 36, issue 4, 2010, Pages 248~254
In this paper, we survey the parallel machines scheduling problem with GoS eligibility constraints so as to minimize the makespan. Our survey covers off-line, online and semi-online scheduling problems. In the case of online scheduling, we only focus on online scheduling one by one. Hence we give an introduction to the problem and present important results of the problem.