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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 31, Issue 4 - Dec 2005
Volume 31, Issue 3 - Sep 2005
Volume 31, Issue 2 - Jun 2005
Volume 31, Issue 1 - Mar 2005
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A Mixed-Integer Programming Model to Draw the Concordance Level and the Kernel Set for the Implementation of ELECTRE IS
Park, Seokyoung ; Kim, Jaehee ; Kim, Sheung-Kown ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 265~276
ELECTRE IS requires the decision maker (DM) to specify several parameters such as weights, pseudo-criteria thresholds and the concordance level. Among these parameters, the concordance level has a significant effect on the outranking relation. And the number of alternatives selected may be sensitive to the value of these parameters. Therefore the DM may have to perform many iterations to obtain the desired number of alternatives in the kernel set. In this study, we developed a mixed-integer programming (MIP) model to elicit the concordance level and thereby to choose the desired number of alternatives in the kernel set. The MIP model can be applied in the interactive process so that the pseudo-criteria thresholds are adjusted according to the results of MIP model. Using the MIP model in the interactive process, we can reduce the number of iterations needed to perform ELECTRE IS.
Strategic Analysis of the Competition between Internet Seller and Conventional Retailer Selling Single Commodity
Cho, Hyung-Rae ; Kwon, Hyo-Seok ; Cha, Chun-Nam ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 277~288
The proliferation of the internet technologies and applications has intensified business activities on the Internet. This study considered the price competition between two shopping channels, one on-line seller and the other traditional off-line retailer. Based on the Hotelling's linear market model, we derive the Nash and Stackelberg equilibria as a function of the cost parameters which represent the characteristics of the online and off-line channels. By analyzing the equilibrium solutions, the following significant findings were obtained. First, pricing by Stackelberg equilibrium always outperformed that of Nash equilibrium. However the value of the cost parameters played a crucial role in determining both channels' preferred position (price leader or follower). Second, the online seller could benefit more in terms of profit by lowering its efficiency when its efficiency belongs to a certain interval. Third, when the online seller's efficiency is low, lowering its delivery cost has no contribution to its profit. To benefit more from lowering its delivery cost, increasing its channel efficiency to a certain level should be preceded.
Comparison of Observational Posture Evaluation Methods based on Maximum Holding Times
Moon, Chanyoung ; Na, Seokhee ; Kee, Dohyung ; Chung, Min K. ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 289~296
This study aims to measure maximum holding times(MHTs) of symmetric and asymmetric whole body postures, and to compare three representative observational methods including OWAS, RULA, REBA, based on the MHTs. An experiment was conducted for obtaining the MHTs, in which hand position was used as experimental variable, and the MHT and subjective discomfort rating as dependent variables. The hand position was defined by the percentage of the shoulder height(%SH), the percentage of the arm reach(%AR) and rotation angle(R). The results showed that three independent variables of %SH, %AR and R significantly affected on the MHTs at
=0.01, and that the MHTs were negatively linearly related to the discomfort scores of Borg CR10. It was also revealed that OWAS and REBA were less sensitive to postural stress than RULA. In addition, OWAS and REBA underestimated postural load of given postures compared to RULA. Therefore, it is recommended that among the three observational methods investigated in this study, RULA be used for a more precise evaluation of postural load.
Analysis of the Push-Pull Queueing System under the N-Policy
Kim, Soo Yeon ; Kim, Nam Ki ; Kim, Jin Dong ; Lee, Sang Min ; Chae, Kyung Chul ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 297~302
Kopzon and Weiss adopted the notion of push-pull into the queueing system recently. We extend this queueing system to the (
)-policy version such that the original system corresponds to the special case
. For the extended system, we perform the cycle analysis and obtain the PGF of the stationary number of customers in the system.
A Design of Capacitated Hub-and-Spoke Networks with Direct Shipment: Evolutionary Algorithm based Approach
Lee, Hyun Soo ; Shin, Kyoung Seok ; Kim, Yeo Keun ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 303~315
In this paper we address a design problem for hub-and-spoke networks and then consider a capacitated hub locations problem with direct shipment (CHLPwD). We determine the location of hubs, the allocation of nodes to hubs, and direct shipment paths in the network, with the objective of minimizing the total cost in the network. In this paper, CHLPwD is formulated as 0-1 integer programming. We develop an evolutionary algorithm here to solve the large sized CHLPwD. To do this, we present the representation and the genetic operators suitable for the problem and propose a heuristic method for the allocation of nodes to hubs. To enhance the search capability, problem-specific information is used in our evolutionary algorithm. The proposed algorithm is compared with the heuristic method in terms of solution quality and computation time. The experimental results show that our algorithm can provide better solutions than the heuristic.
Setup and Operation Sequence Generation from Manufacturability Evaluation for Prismatic Parts
Choi, Hoo Gon ; Han, Jung Hyun ; Kang, Mujin ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 316~333
Although some successful recognition algorithms have been developed, most of them did emphasize on extracting accurate interpretations without considerations of manufacturability. Evaluating the manufacturability for multiple features leads to produce the machining sequences. In this paper, the A* algorithm guarantees the optimal setup sequences with minimizing the machining cost. Also, tolerances including surface roughness are converted to STEP formats to be utilized for more reliable process plans. Finally, decision tables are used to create the detailed operational sequences based on geometric tolerances and surface roughness. Machining parameters such as feed, depth of cut, and cutting speed for each operation are added to the routing sheet. Windows are presented to show how the entire system works for a sample part.
A Time Prediction Model of Cursor Movement with Path Constraints
Hong, Seung-Kweon ; Kim, Sung-Il ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 334~340
A mouse is an important input device that is used in most of all computer works. A mouse control time prediction model was proposed in this study. Especially, the model described the time of mouse control that made a cursor to move within path constraints. The model was developed by a laboratory experiment. Cursor movement times were measured in 36 task conditions; 3 levels of path length, 3 levels of path width and 4 levels of target's width. 12 subjects participated in all conditions. The time of cursor movement with path constraints could be better explained by the combination of Fitts' law with steering law(
) than by the other models; Fitts' law(
), Steering law(
) and Crossman's model(
). The proposed model is expected to be used in menu design or computer game design.
Repair-Replacement Strategies for Warranted Items with Phase-Type Lifetimes
Kim, Ho-Gyun ; Rao, B. Madhu ; Bae, Chang-Ok ; Kim, Seung-Chul ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 341~348
This paper is concerned with the question of servicing warranties for repairable items. During the warranty period, each time an item fails the manufacturer has the obligation to restore the item to operational condition either by repairing the item or by replacing it with a new item. In this paper, we consider repair-replacement strategies based on the condition of the failed item. For products with phase-type lifetime distributions where the phases represent the condition of the item, we develop algorithms to determine the expected cost of servicing a warranty and use it in making the repair-replacement decision. Illustrative numerical examples are presented. We also propose a dynamic strategy by taking the expected remaining warranty cost into consideration.
Performance Comparison of AMR Codec Mode Allocations in Downlink WCDMA System
Jeong, S.H. ; Hong, J.W. ; Lee, S.C. ; Lie, C.H. ;
Journal of Korean Institute of Industrial Engineers, volume 31, issue 4, 2005, Pages 349~357
The Adaptive Multi-Rate (AMR) speech codec is the mandatory for voice service in WCDMA systems. The AMR codec can be used efficiently to provide a balanced trade-off between the capacity and quality of voice by adjusting various service rates. In this paper, three ways of AMR mode allocation schemes on the downlink in WCDMA system are evaluated. To evaluate users satisfaction efficiently, new system performance measure and analytic models are proposed. The proposed analytic models can be applied to obtain optimal mode allocation ways while considering the system capacity and quality of voice. In numerical examples, the ways of finding optimal parameters are illustrated for the given traffic loads and the performances of three mode allocation schemes are compared.