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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 16, Issue 2 - Dec 1990
Volume 16, Issue 1 - Jun 1990
Selecting the target year
Variables Sampling Inspection Procedures and Tables with Severity Adjustment
Bai, Do-Sun ; Hong, Sung-Hoon ; Sohn, Mi-Ae ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 1~15
An AQL type variables sampling system with switching rules is proposed. Comparative studies of existing variables sampling standards - MIL-STD-414, ANSI Z1.9, ISO 3951, and BS 6002 - are made, and simulation studies on switching procedures are conducted. Based on comparative and simulation studies, a variables sampling standard for Korean industry is proposed. The master sampling tables of the proposed standard are taken from the variables standard ANSI Z 1. 9 and the switching rules are matched to the attributes standard KS A 3109 to enable us to move between the proposed variables standard and KS A 3109. Composite OC and ASN curves of the proposed standard are calculated for selected combinations of lot sizes and AQL's and they are compared with those of ANSI Z1.9.
A Polynomial Algorithm for the Minimum Spanning Arborescence in Transportation Networks with Bitype Arc Costs
Sim, Hyun-Taek ; Park, Soon-Dal ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 17~25
Most of the least cost transportation network design problems are frequently formulated as the minimum spanning arborescence problems in directed networks with bitype are costs. These costs are classified whether the arc is included in the path from the root to a specified node over a given spanning arborescence. We prove that this problem is NP-hard, and develop a polynomial time algorithm for acyclic networks. The probelm in acyclic networks is initially formulated as 0-1 integer programming. Next, we prove that the 0-1 relaxed linear programming has an integral optimum solution by complementary slackness conditions. In this paper, we present an
algorithm based on a shortest path algorithm.
A Dynamic Transportation-Inventory Model with Quantity Discounts and Disposals
Shon, Kweon-Ik ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 27~36
This study deals with the dynamic transportation-inventory model for a single product from which the optimal procurement quantities and the transportation modes are determined simultaneously over a finite planning horizon. Moreover, it covers the situation where quantity discounts are applied to the transportation cost as well as the purchase cost and disposals of the excess are possible at the end of each period. For a relevant mathematical model formulated, the theorems and properties of an optimal solution are discussed to present the efficient algorithm. A numerical example is solved to illustrate the algorithm developed.
A Study on the ISDN Traffic Engineering
Lee, Kang-W. ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 37~50
It has been recognized several years ago that traffic engineering in the multiservice environment of future ISDN will bring an incredible amount of work to be done. It is also true that ISDN traffic studies have been performed in case by case with traffic engineers' own discipline and with a poor knowledge on traffic characteristics and user behavior. In this study three major mainstreams of the currently active research topics are identified, which need to be standardized and analyzed under some unifying concepts. Based on the results of CCITT discussions, an attempt is made to answer the each question. The standardized analysis method will be most important for the design, engineering and operation of the ISDN in future.
A Capacity Expansion Planning Model for Single-Facility with Two Distinct Capacity Type
Chang, Suk-Hwa ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 51~58
A deterministic capacity expansion planning model for a two-capacity type facility is analyzed to determine the sizes to be expanded in each period so as to supply the known demands for two distinct capacity type(product) on time and to minimize the total cost incurred over a finite planning horizon of T periods. The model assumes that capacity unit of the facility simultaneously serves a prespecified number of demand units of each capacity type, that capacity type 1 can be used to supply demands for capacity type 2, but that capacity type 2 can't be used to supply demands for capacity type 1. Capacity expansion and excess capacity holding cost functions considered are nondecreasing and concave. The structure of an optimal solution is characterized and then used in developing an efficient dynamic programming algorithm that finds optimal capacity planning policy.
Determination of Optimal Number of AGV by Simulation
Lee, Mun-Sup ; Yi, Sang-Yong ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 59~65
In the design of AGVS (Automated Guided Vehicle Systems), one of the important problem is to determine the number of AGVs required to provide a given level of transport service. At present, there are two kind of methods to determine the number of AGVs, the one is to use the mathematical model, the other is to use the simulation technique. Among these, simulation based technique is more reliable than analytical method. In this sense, this paper intend to determine the optimal number of AGVs using personal computer simulation by SIMAN Ver.3.5.
Effectiveness of Physical Exercises for VDT Operators
Lee, K.S. ; Waikar, A.M. ; Oh, Y. ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 67~81
Effectiveness of physical exercise in reducing work-related musculoskeletal stress was investigated. This was compared to the stress alleviation accomplished by using ergonomically designed work station. Tasks chosen for the study were data entry and file maintenance on the video display terminal (VDT). Three different measures, namely root-mean-square (RMS) values of electromyogram (EMG), subjective rating and task performance were used for the evaluation. Electromyograms were recorded from the neck, the left and right trapezius muscles in the shoulder region, and L2/L3 region of the back. Subjects rated discomfort levels for the same parts of their body. Task performance was measured by recording typing speed and errors. Each of the five subjects was tested for two days (8 hours/day) in two different work stations. These were the ergonomically designed adjustable work station and the fixed work station of traditional design with no adjustable features. Assigned physical exercises were performed for four minutes, every two hours during the breaks, by the subjects while working in the fixed work station. It was concluded that the physical exercise could be helpful in reducing musculoskeletal stress as effectively as the ergonomic design of the VDT work station.
A Study on the Effects of Information Characteristics on the Overconfidence Phenomenon in Intuitive Probability Judgements
Cho, Sung-Ku ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 83~98
Previous studies have shown strong tendancy toward overconfidence in intuitive probability judgements. The purpose of the present study is to investigate the relations between this overconfidence phenomenon and the three major characteristics of information, namely, the pertinance, the redundancy and the quantity. An experiment was conducted where the subjects were asked to respond to 120 questions of the same type. In each question, the subjects' task was to predict, in the light of given information, which of the two given countries would have had higher GNP in 1979 and to give the probability that their choice would be correct. The results suggests that only the pertinance of information has significant influence on the degree of overconfidence.
An Optimal Boundary Shape for Class-Based Storage Assignment Policy in Automated Storage/Retrieval Systems
Hwang, Hark ; Ha, Jae-Won ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 99~106
With two-class-based storage assignment policy and dual command cycle in Automated Storage/Retrieval Systems(AS/RS), the problem of determining the region dedicated for class-one item is considered. First, the expected travel time of the S/R machine is derived when the boundary of the class-one region is square. Secondly, a heuristic procedure is proposed which determines sequentially the class-one region in a discrete rack. An application of the procedure generates leaf shape region which confirms that the L-shape partition is not necessarily optimal.
Modeling of Vacation Queues by Supplementary Variables
Lee, Soon-Seok ; Lee, Ho-Woo ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 107~114
A queueing system with compound Poisson arrival and server vacation is analyzed by including supplementary variables. We consider a vacation system in which the server leaves for a vacation as soon as the system empties. When he returns, if no customer is waiting for service, he waits until a group of customers arrive and then begins to serve. We obtain the system size distribution and the waiting time distribution. Additional performance measures will be also considered.
Lot Size Determination in the Kanban System
Kang, Suk-Ho ; Kang, Jin-Young ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 115~122
Kanban, a pull system for inventory control is in direct contrast to conventional push systems. In the pull system, the kind and quantity of items needed by the succeeding stage are withdrawn from the preceding stage, only at the rate and at the time they are consumed. In this paper, lot size models are formulated in two special cases of practical interests and simple solution procedures are adapted to minimize the total cost of the kanban system. An numerical example is solved to illustrate the method.
A Survey on the Application of Expert System and Artificial Intelligence in Production Planning
Hong, Yu-Shin ; Seong, Deok-Hyun ; Park, Kee-Jin ;
Journal of Korean Institute of Industrial Engineers, volume 16, issue 1, 1990, Pages 123~135
An extensive survey is carried out on the applications of AI (Artificial Intelligence) and ES (Expert System) in mathematical programming and simulation, which are the most frequently used tools in production planning. A scheduling field is also reviewed. The scheduling problem is one of the most attractive area for AI and ES researchers, since any practical algorithmic solution methods are not available. The current practice and difficulty of applying AI and ES to production planning are discussed and future research directions are identified.