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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 26, Issue 4 - Dec 2000
Volume 26, Issue 3 - Sep 2000
Volume 26, Issue 2 - Jun 2000
Volume 26, Issue 1 - Mar 2000
Selecting the target year
Characterizing the Independent Cells by Increasing Grouping Efficiency
Cho, Moon-Soo ; Jeong, Byung-Hee ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 1~8
We extended a minimum spanning tree algorithm (Cho et al., 1997) by characterizing the mutually independent cells with maximizing the grouping efficiency referring to few propositions developed by Shu, 1990 in cellular manufacturing system. Each row of the machine-part incidence matrix is regarded as a node in a graph, and a distance function is defined for every pair of nodes. It shows that there are K mutually independent cells in the cellular manufacturing system if only if there are K-1 arcs of length 1 in the minimum spanning tree of the graph, and gives an effective policy for sub-cell formation from larger cells.
A study for the development of Blind-Pointing Method to extract drivers' cognitive map on Instrument Panel
Yu, Seung-Dong ; Park, Peom ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 9~16
In these days, the interior interface design for vehicle drivers was recognized as important affairs. Thereby, many studies are being performed for this. These studies emphasize the physical factors and usability of human, but those for the cognitive factors are not enough. Cognitive factors are very important elements to determine the drivers' performance. In this study, it was studied about the method to extract a driver's cognitive map on IP(Instrument Panel) in dynamic situation, and BPM(Blind-Pointing Method) was proposed for this. The BPM is the method to extract a cognitive map by subject's pointing action under the blinded condition. The experiment was conducted to validate compatibility of BPM as the method to extract a cognitive map. In the experiment, subjects were divided in two groups, the first group of subjects has their own vehicle and driver license, and the second group of subjects doesn't have own vehicle but has driver license. The result shows that the IP form of cognitive map is not different between two groups, and BPM is the compatible method to extract a cognitive map.
Integrated Order Scheduling with Limited Production Capacity of Multiple Producers in Distribution Requirement Planning Systems ( DRPs )
Yoo, Yeong-Joon ; Rhee, Jong-Tae ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 17~26
This paper presents an integrated order scheduling method with the improved DRP concept for multi-echelon distribution system that has the constraint of limited production capacity of producers. The proposed method reflects the dynamic characteristics of inventory level changes in the regional and central distribution center. The simulation is done with two models : the traditional DRP method and the proposed method presented in this paper. From the results, the latter is more efficient than the former in cost, customer's service level as well as balanced production load on each producer.
Practical Validity of Weighting Methods : A Comparative Analysis Using Bootstrapping
Jeong, Ji-Ahn ; Cho, Sung-Ku ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 27~35
For a weighting method to be practically valid, it should produce weights which coincide with the relative importance of attributes perceived by the decision maker. In this paper, 'bootstrapping' is used to compare the practical validities of five weighting methods frequently used; the rank order centroid method, the rank reciprocal method, the rank sum method, the entropic method, and the geometric mean method. Bootstrapping refers to the procedure where the analysts allow the decision maker to make careful judgements on a series of similar cases, then infer statistically what weights he was implicitly using to arrive at the particular ranking. The weights produced by bootstrapping can therefore be regarded as well reflecting the decision maker's perceived relative importances. Bootstrapping and the five weighting methods were applied to a job selection problem. The results showed that both the rank order centroid method and the rank reciprocal method had higher level of practical validity than the other three methods, though a large difference could not be found either in the resulting weights or in the corresponding solutions.
Fuzzy DEA under Uncertainty
Choi, Hong ; Sohn, So-Young ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 36~47
DEA has been effectively applied to various areas which need the evaluation of relative efficiency. We propose a DEA model based on fuzzy LP in order to consider uncertain synergy effects due to M&A of existing organization. We apply the suggested approach to forecasting the efficiency of merged academic departments in a university in Korea. We expect that our approach can be utilized to effectively realign existing departments.
An Optimal Ordering Policy under the Condition of a Free Addition
Shinn, Seong-Whan ; Song, Chang-Yong ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 48~53
This paper deals with the problem of determining the optimal ordering quantity under the condition of a free addition. It is assumed that the supplier permits a fixed free addition depending on the amount of the quantity purchased by the customer. Investigation of the properties of an optimal solution allows us to develop an algorithm whose validity is illustrated through an example problem.
An Evaluation of Operator Performance Related to the Switch Types in Man Control Rooms of the Nuclear Power Plants
Byun, Seung-Nam ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 54~65
The objective of this study is to evaluate the operator performance relating to hand switches with two or three buttons in the main control rooms of nuclear power plants. Based on the comparative analysis of the nuclear power plants, two different subjective workload-rating scales were used to evaluate the performance of 48 operators: the Overall Workload(OW) and National Aeronautics and Space Administration Task Load Index (NASA TLX). The survey questions consisting of the eight-items were asked to evaluate the operating experiences for the two different switch types. The OW scales ratings were applied to measure the workload of the switch-related tasks. The ratings revealed that signal detection tasks caused less workload in the three-buttoned-switch operators than the other switch group. However, in the switch operation tasks, the switch types did not show statistically significant effects on workload level. The NASA TLX scale ratings were performed based on detailed task scenarios that assumed the accident of small break loss of coolant, what we call, the small LOCH. The NASA TLX was administered to three different task groups: the reactor, the turbine, and the electric operator groups. Based on the NASA TLX, the two-buttoned switch groups showed higher workload than those with the three-buttoned switches. However, a statistically significant difference was found only in the reactor operator groups. When the current switch type was assumed to be changed for the other type, all of the three-buttoned switch groups were predicted to have higher workload than the other switch groups, respectively. The implications of these findings were discussed.
Dynamic Clearance Pricing Policy for Durable Goods
Lee, Kyung-Keun ; Kim, Young-Seok ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 66~72
Inventory management of a product not to be produced any more has a great impact on the financial status of a company. Clearance pricing can make bigger sales volume together with great savings of inventory holding cost specially for a durable goods with relatively large inventory carrying cost and accordingly cash inflow can be improved. This paper deals with the inventory management by non-linear clearance pricing with the sales rate which depends on the accumulated sales volume and selling price.
Determination of the Elbow Transverse Joint Using the Helical Axis Concept and its Application to the Development of a Kinematic Arm Model
Woo, Bum-Young ; Jung, Eui-S. ; Yun, Myung-Hwan ;
Journal of Korean Institute of Industrial Engineers, volume 26, issue 1, 2000, Pages 73~80
To determine the exact direction and location of the human joint in motion is crucial in developing a more accurate human model and producing a more fitting artificial joint. There have been several reports on the biomechanical analysis of the joint to determine the anatomy and movement of joints. However, all the previous researches were made in vitro study, that is, they investigated the passive movement of the joint from cadavers and the suggested location of the joint axis was difficult to make practical applications due to the lack of the direction of joint axis. Also, in many biomechanical models, each joint axis is assumed to lie horizontally or vertically to the adjacent links. Such an assumption causes inherent inaccuracy. In this study, the direction and location of the transverse elbow axis was obtained with respect to the global coordinate system whose origin is on the lateral epicondyle of the humerus. The suggested result based on the global coordinate system lying on the external landmark will be helpful to understand the information of the axis and to make an application. From the experiments conducted for five subjects, the direction and location of the elbow transverse joint was determined for each subject by the helical axis method. A statistical validation was also performed to confirm the result. Finally, the result was applied to develop a simple elbow model which is a part of the kinematic arm model. The simple elbow movement model was developed to validate the significance of the result and the kinematic arm model was able to describe the geometry of any complex linkage system. As a result, the errors incurred from the proposed model were significantly reduced when compared to the ones from the previous approach.