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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society for Simulation
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Journal DOI :
The Korea Society for Simulation
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Volume & Issues
Volume 20, Issue 4 - Dec 2011
Volume 20, Issue 3 - Sep 2011
Volume 20, Issue 2 - Jun 2011
Volume 20, Issue 1 - Mar 2011
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A Simulation Study on the Variability Function of the Arrival Process in Queueing Networks
Kim, Sun-Kyo ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 1~10
DOI : 10.9709/JKSS.2011.20.2.001
In queueing network analysis, arrival processes are usually modeled as renewal processes by matching mean and variance. The renewal approximation simplifies the analysis and provides reasonably good estimate for the performance measures of the queueing systems under moderate conditions. However, high variability in arrival process or in service process requires more sophisticated approximation procedures for the variability parameter of departure/arrival processes. In this paper, we propose an heuristic approach to refine Whitt's variability function with the k-interval squared coefficient of variation also known as the index of dispersion for intervals(IDI). Regression analysis is used to establish an empirical relationships between the IDI of arrival process and the IDI of departure process of a queueing system.
The Implementation of Drilling Simulation for Offshore Rig Education
Park, Ju-Yong ; Jo, Hyo-Jae ; Lee, Jee-Hoon ; Lim, Young-Jin ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 11~17
DOI : 10.9709/JKSS.2011.20.2.011
The purpose of this study is 3 dimensional modeling of lower part of drilling system in offshore rig and simulation of drilling process. Recently, shipbuilding companies have been focusing on offshore rigs due to their high added-value and the reduced demand of new shipbuilding. In most cases, however, the basic design, installation and management of offshore rig are carried out by foreign companies. Therefore, it is difficult to obtain the knowledge and information of drilling system. In this study drilling devices, BOP(Blowout Preventor) and cementing job and mud circulation related components are included as the main components of offshore rig. The structure and function of them were analyzed from a viewpoint of object-oriented technique. On the basis of this analysis they were modeled in the 3 dimensional structure with 3D software tool such as CATIA and 3DVIA Composer. The drilling process was simulated according to the scenario of drilling operation. This simulation system can be effectively used for an educational tool for students and engineers in ocean plant industries.
Impact of Smoothed Replenishment Ordering Policy on the Performance Measures in Supply Chain
Cho, Myeon-Sig ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 19~27
DOI : 10.9709/JKSS.2011.20.2.019
This study investigates impact of smoothed replenishment ordering policy on the performance measures such as lead time, order fulfillment ratio, and inventory cost. We consider a two-echelon supply chain: a single retailer orders using smoothed order up to replenishment policy and a manufacturer produces the retailer's orders on a make to order basis. Simulation result confirms that lead time from the manufacturer can be reduced by smoothed ordering policy as expected. However, smoothing orders may deteriorate the customer order fulfillment ratio and inventory cost in a retailer. We also observe that variance of manufacturing time contributes more than mean of manufacturing time to both order fulfillment ratio and inventory cost. Therefore, variability of upstream manufacturing time should be minimized.
Consumer-Agent Based Sensitivity Analysis of Product Diffusion Dynamics for Domestic Automobile Market
Kim, Shin-Tae ; Kim, Chang-Ouk ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 29~40
DOI : 10.9709/JKSS.2011.20.2.029
This paper focuses on the sensitivity analysis for the calibration of an agent-based simulation that analyzes the brand-level diffusion dynamics of competing products in the domestic premium mid-sized car market. In this paper, we employ a consumer-agent model that imitates the purchasing characteristics and behaviors of the consumers. The group of consumer agents that are socially interconnected represents a virtual market. By spreading the product information from previous adopters to potential consumer agents in the virtual market, the word-of-mouth phenomenon emerges like in the real market. The phenomenon influences the product choice of potential consumer agents that causes the variation of the product diffusion dynamics. In this simulation model, it is important to calibrate the virtual market parameters(e.g., ratio of innovators, social network structure, purchase time decision method) so that the virtual market can simulate the real market. However, it is difficult to measure these parameters directly from the real market. In this paper, we analyze the diffusion dynamics of simulations under various conditions in comparison with real sales data to calibrate the parameters.
Naval Gun Fire Control System Simulation for Verification Depending on Development Phase
Kim, Eui-Jin ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 41~48
DOI : 10.9709/JKSS.2011.20.2.041
Naval Gun FCS(Fire Control System) is the most fundamental weapon system in Naval Combat System. Simulationbased verification of FCS is mandatory before sea trial since ballistic solution needs complicated process and uses almost all information produced by own ship sensors. The FCS simulation method is proposed for verification of naval gun FCS and applicable to the FCS design depending on combat system development phase based on available data in each design phase. Verified FCS through proposed simulation method is adapted in real naval combat system and the performance has been proven by sea trial.
A Simulator for the Design and Operation of the Steel Mill
Choi, Seong-Hoon ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 49~57
DOI : 10.9709/JKSS.2011.20.2.049
Stiff competition and skyrocketing prices of raw materials are increasingly demanding the optimal design and operation of iron and steel mills minimizing trial and error. Computer simulation can provide the methodology in accordance with requirements. The purpose of this paper is to suggest a simulator for the design and operation of the steelmaking and continuous casting mill. The simulator was developed using Arena, popular simulation software and input and output interface based on MS Excel. It allows easy access for the maintenance and extension of the model. One of distinct features of the proposed simulator is the inclusion of complex transportation modules composed of transfer cars and overhead cranes. The simulator can be used for evaluating various alternative designs of a projected mill via throughput analysis and material flow analysis. Also, one can utilize it effectively to search for the best product mix suitable for many types of situations. It could be an invaluable tool evaluating the performance of operation patterns and improving the accuracy.
Modeling and Simulation for Evaluating the Submarine Detection Capability of ASW Missions for an Anti Submarine Helicopter
Yu, Chan-Woo ; Kim, Jae-Ick ; Kim, Cheol-Ho ; Jung, Young-Ran ; Park, Sung-Woon ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 59~66
DOI : 10.9709/JKSS.2011.20.2.059
In this paper, a method to allocate a submarine search mission to an ASW(Anti-Submarine Warfare) helicopter is proposed. The aim of the proposed method is to increase the submarine detection capability. For this purpose, we modeled the behaviors that the ASW helicopter conduct during the search mission, and the relations between the behaviors are also modeled. To measure quantitatively the effectiveness of ASW search mission, the measure of effectiveness(MOP) is defined. Scenarios are designed to analyze the effectiveness utilizing the ASW mission model. We conducted simulations applying the designed scenarios and some parameters concerned with the friendly ship and the enemy submarine interacting each other in the ASW missions. We analyzed the result of simulation depending on the dipping interval and the pattern of dipping positions in the situation that the helicopter operates for a long time and should resupply several times on the friendly ship. From the analyzed data, we suggested the practical value of ratio between the detectable range of the sonar and the dipping interval to improve the effectiveness of ASW mission.
An Evaluation of Routing Methods and the Golden Zone Effect in the Warehouses Order Picking System
Li, Jin ; Lee, Yong-Dae ; Kim, Sheung-Kown ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 67~76
DOI : 10.9709/JKSS.2011.20.2.067
Order picking in automotive service parts warehouses is considered to be the most labor-intensive operation. Such warehouses contain hundreds of thousands of items, but normally 20% of products contribute to about 80% of turnover according to Pareto's 80-20 principle. Therefore most fast moving items are located near an outbound area which is called the "Golden Zone". Order picking routing efficiency is related to productivity and labor cost. However, most companies use simple methods. In this paper, we describe a series of computational experiments over a set of test cases where, we compared various previously existing routing heuristics to an optimal algorithm. We focus on examining the influence of the golden zone on the performance and selection of routing methods. The results obtained show that the optimal routing method increases the productivity at least 17.2%, and all the routing methods have better performance as the pick up rate from the golden zone increases.
Cancer Diagnosis System using Genetic Algorithm and Multi-boosting Classifier
Ohn, Syng-Yup ; Chi, Seung-Do ;
Journal of the Korea Society for Simulation, volume 20, issue 2, 2011, Pages 77~85
DOI : 10.9709/JKSS.2011.20.2.077
It is believed that the anomalies or diseases of human organs are identified by the analysis of the patterns. This paper proposes a new classification technique for the identification of cancer disease using the proteome patterns obtained from two-dimensional polyacrylamide gel electrophoresis(2-D PAGE). In the new classification method, three different classification methods such as support vector machine(SVM), multi-layer perceptron(MLP) and k-nearest neighbor(k-NN) are extended by multi-boosting method in an array of subclassifiers and the results of each subclassifier are merged by ensemble method. Genetic algorithm was applied to obtain optimal feature set in each subclassifier. We applied our method to empirical data set from cancer research and the method showed the better accuracy and more stable performance than single classifier.