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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 Capacity Planning in Hybrid Flowshops for Maximizing Throughput Under a Budget Constraint
Lee, Geun-Cheol ; Choi, Seong-Hoon ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 1~10
DOI : 10.9709/JKSS.2011.20.3.001
In this study, we consider a capacity planning problem where the number of machines at each workstation is determined in manufacturing systems of top-edge electronic products such as semiconductor or display. The considered manufacturing system is the typical hybrid flowshop which has identical parallel machines at each workstation and the setup operation occurs when the types of consecutively processed products are different. The objective of the problem is finding good combinations of the numbers of machines at all workstations, under the given capital amount for purchasing machines. Various heuristic methods for determining the numbers of machines at workstations are proposed and the performances were tested through a series of computational experiments. In the study, a simulation model has been developed in order to simulate the considered manufacturing system with dynamic orders and complex process. The simulation model is also used for conducting the computational comparison test among various proposed methods.
Operational Effectiveness Analysis of Field Artillery Ammunition Support Vehicle for K-55 Self-Propelled Artillery Using Simulation
Jung, Chi-Young ; Lee, Jae-Moon ; Lee, Jae-Yeong ; Park, Young-Kyu ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 11~18
DOI : 10.9709/JKSS.2011.20.3.011
Korea army is operating K-10 FAASV (Field Artillery Ammunition Support Vehicle) for K-9 SP (Self-Propelled artillery) and examining employment of FAASV for K-55 SP. At present, the FAASV for K-55 SP has been developed as a prototype. To decide the employment of this FAASV for K-55 SP, previous research for operational effectiveness of this equipment is needed. Therefore in this paper, we presented the result of the operational effectiveness of the FAASV for K-55 SP using a wargame model, FEAM (Fire Execution Analytic Model) which is used to analyze formation, weapon system and operation in army artillery field. Based on the result of the FEAM simulation, we introduced the operational effectiveness of FAASV for K-55 SP, which is able to be applied to decide whether employ FAASV for K-55 SP or not.
Adaptive Random Testing for Integrated System based on Output Distribution Estimation
Shin, Seung-Hun ; Park, Seung-Kyu ; Choi, Kyung-Hee ; Jung, Ki-Hyun ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 19~28
DOI : 10.9709/JKSS.2011.20.3.019
Adaptive Random Testing (ART) aims to enhance the performance of pure random testing by detecting failure region in a software. The ART algorithm generates effective test cases which requires less number of test cases than that of pure random testing. However, all ART algorithms currently proposed are designed for the tests of monolithic system or unit level. In case of integrated system tests, ART approaches do not achieve same performances as those of ARTs applied to the unit or monolithic system. In this paper, we propose an extended ART algorithm which can be applied to the integrated system testing environment without degradation of performance. The proposed approach investigates an input distribution of the unit under a test with limited number of seed input data and generates information to be used to resizing input domain partitions. The simulation results show that our approach in an integration environment could achieve similar level of performance as an ART is applied to a unit testing. Results also show resilient effectiveness for various failure rates.
Evaluation of the Staggering Appointment Policy in a Two-Stage Service System
Min, Dai-Ki ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 29~39
DOI : 10.9709/JKSS.2011.20.3.029
The appointment system is widely used to facilitate customer access to service in many industries including healthcare and others. Because of its importance, much research has investigated how to build an effective appointment policy under various environments. However, most research has considered a single-server service system. The objective of this work is to evaluate several appointment policies in a two-stage service system in which multiple servers are available and build separate appointments at the second-stage. In such a system, we propose and evaluate the staggering appointment policy. Simulation experiments indicate that the proposed staggering appointment policy outperforms other traditional appointment policies in terms of customer waiting time, server idle time, and the number of customers who are later to scheduled appointments.
Design for Distributed Simulator using Wired and Wireless Devices
Jo, Soo-Hyun ; Lee, Jong-Sik ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 41~48
DOI : 10.9709/JKSS.2011.20.3.041
Wireless communication technology developed, portable wireless devices based on wireless network including the smartphone rapidly developed, and products with functions similar to highly efficient computer are being launched. Therefore, active studies to enable performance of works, which were previously held in computers, on portable wireless terminal are being held. Until now, simulation was undertaken using computers which satisfy high performance computing resource. Such contains a problem that it cannot break away the limit of space. Portable wireless terminal has the merit that it can break away from the limit of space by using wireless network in comparison to wired environment. In this paper, it suggests a simulator based on wireless devices for distributed simulation. For such purpose, the performance time of simulation will be compared in regards to the case of performing nodes control simulation in a single highly efficient computer and the case of performing distributed simulation in many wired and wireless network environments. Through the comparison, the possibility for utility of portable wireless terminal as the object of distributed simulation will be verified, and it will be presented that simulation can be performed in a shorter time by performing distributed simulation under various wired and wireless network environments away from the limit of space.
A Case Study of Comparing the Measuring Methods for Workloads of Resources in a Manufacturing Processes of Semiconductor-Parts
Kim, Dong-Soo ; Moon, Dug-Hee ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 49~58
DOI : 10.9709/JKSS.2011.20.3.049
The workloads of facilities and laborers are important for the capacity planning in a factory. They are always referenced whenever a factory develops a new product, increases the production quantity and makes a plan of new investment. There are many measuring methods for estimating the workload effectiveness of facilities and laborers. In this paper, various measuring methods including survey, work sampling, micro-motion study, data gathering from ERP system and simulation, are analyzed for comparing the accuracy of workload. This case study is conducted in a Korean company that produces semiconductor parts like leadframe and packaging substrate.
The Fault Analysis Model for Air-to-Ground Weapon Delivery using Testing-Based Software Fault Localization
Kim, Jae-Hwan ; Choi, Kyung-Hee ; Chung, Ki-Hyun ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 59~67
DOI : 10.9709/JKSS.2011.20.3.059
This paper proposes a model to analyze the fault factors of air-to-ground weapon delivery utilizing software fault localization methods. In the previous study, to figure out the factors to affect the accuracy of air-to-ground weapon delivery, the FBEL (Factor-based Error Localization) method had been proposed and the fault factors were analyzed based on the method. But in the study, the correlation between weapon delivery accuracy and the fault factors could not be revealed because the firing accuracy among several factors was fixed. In this paper we propose a more precise fault analysis model driven through a study of the correlation among the fault factors of weapon delivery, and a method to estimate the possibility of faults with the limited number of test cases utilizing the model. The effectiveness of proposed method is verified through the simulation utilizing real delivery data. and weapons delivery testing in the evaluation of which element affecting the accuracy of analysis that was available to be used successfully.
Regional Path Re-selection Period Determination Method for the Energy Efficient Network Management in Sensor Networks applied SEF
Park, Hyuk ; Cho, Tae-Ho ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 69~78
DOI : 10.9709/JKSS.2011.20.3.069
A large-scale sensor network usually operates in open and unattended environments, hence individual sensor node is vulnerable to various attacks. Therefore, malicious attackers can physically capture sensor nodes and inject false reports into the network easily through compromised nodes. These false reports are forwarded to the base station. The false report injection attack causes not only false alarms, but also the depletion of the restricted energy resources in a battery powered network. The statistical en-route filtering (SEF) mechanism was proposed to detect and drop false reports en route. In SEF, the choice of routing paths largely affect the energy consumption rate and the detecting power of the false report. To sustain the secure routing path, when and how to execute the path re-selection is greatly need by reason of the frequent network topology change and the nodes's limitations. In this paper, the regional path re-selection period determination method is proposed for efficient usage of the limited energy resource. A fuzzy logic system is exploited in order to dynamically determine the path re-selection period and compose the routing path. The simulation results show that up to 50% of the energy is saved by applying the proposed method.
Many-to-Many Warship Combat Tactics Generation Methodology Using the Evolutionary Simulation
Jung, Chan-Ho ; Ryu, Han-Eul ; You, Yong-Jun ; Chi, Sung-Do ; Kim, Jae-Ick ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 79~88
DOI : 10.9709/JKSS.2011.20.3.079
In most existing warships combat simulation system, the tactics of a warship is manipulated by human operators. For this reason, the simulation results are restricted due to the stereotype of human operators. To deal with this, we have employed the genetic algorithm for supporting the evolutionary simulation environment. In which, the tactical decision by human operators is replaced by the human model with a rule-based chromosome for representing tactics so that the population of simulations are created and hundreds of simulation runs are continued on the basis of the genetic algorithm without any human intervention until to find emergent tactics which shows the best performance throughout the simulation. This paper proposes an evolutionary tactics generation methodology for the emergent tactics in many-to-many warship combat simulation. To do this, 3:3 warship combat simulation tests are performed.
An Operation Simulation of MAGLEV using DEVS Formalism Considering Traffic Wave
Cha, Moo-Hyun ; Lee, Jai-Kyung ; Beak, Jin-Gi ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 89~100
DOI : 10.9709/JKSS.2011.20.3.089
The MAGLEV (Magnetically Levitated Vehicle) system, which is under commercialization as a new transportation system in Korea, is operated by means of unmanned automatic control system. Therefore the plan of train operation should be carefully established and validated in advance. In general, when making the train operation plan, the statistically predicted traffic data is used. However, traffic wave can occur when real train service is operated, and the demand-driven simulation technology is required to review train operation plans and service qualities considering traffic wave. This paper presents a method and model to simulate the MAGLEV's operation considering continuous demand changes. For this purpose, we employed the discrete event model which is suitable for modeling the behavior of railway passenger transportation, and modeled the system hierarchically using DEVS (Discrete Event System Specification) formalism. In addition, through the implementation and experiment using DEVSim++ simulation environment, we tested the feasibility of the proposed model and it is also verified that our demand-driven simulation technology could be used for the prior review of the train operation plans and strategies.
A Simulation Framework of Multi-Agent Based Small Engagement Using Cougaar Architecture
Hwam, Won-K. ; Chung, Yong-Ho ; Park, Sang-C. ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 101~109
DOI : 10.9709/JKSS.2011.20.3.101
M&S in the field of national defense is a battle system has been highly spotlighted for obtaining weapon systems, analyzing and experimentation of battle effects to reduce costs, time, and risks. It is classified as Campaign, Mission, Engagement, and Engineering levels by detail of description. In engagements, many situations on the battle field which are really unpredictable are required to be considered on the view of diverse tactics. Thus, engagement simulation is in demand to use for forecasting real-world battle situations by inserting various components which consists of real engaging situations into virtual local battle field. While developing the engagement simulation, adopting the concept of agent-based simulation gives it benefits which are improved autonomy, composability, and reusability of entities. It means reducing the time, cost and effort to develop the simulations. This paper concentrates on the framework of multi-agent based engagement simulation using Cougaar Architecture.
The Rule-based Agent Modeling and Simulation considering the Evacuation Behavior Characteristics on the Passenger Ship Fire
Lee, Eun-Bok ; Shin, Suk-Hoon ; You, Yong-Jun ; Chi, Sung-Do ; Kim, Jae-Ick ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 111~117
DOI : 10.9709/JKSS.2011.20.3.111
This paper suggests the passenger model considered evacuation behavioral characteristics on the passenger ship fire using a rules-based agent technique. The existing evacuation simulation system was modeled only passenger speed. The speed-based model considered passenger's physical characteristics, so it couldn't consider evacuation behavioral characteristics. For solving this problem, we modeled the passenger model using a rule-based agent applied evacuation behavioral characteristics. The rule-based agent consists of knowledge base and inference engine. In knowledge base, we represented evacuation behavioral characteristics, and chose the examples of the evacuation behavioral characteristics to show various patterns of behavior. And we simulated in the IMO MSC/Circ.1238 example 8 and we proved the simulation results could represent variety patterns of human behavior.
A Simulation Study on the Overhaul Repair Shop of Weapon System
Shin, Kyeong-Wook ; Lee, Geun-Hyu ; Moon, Dug-Hee ;
Journal of the Korea Society for Simulation, volume 20, issue 3, 2011, Pages 119~127
DOI : 10.9709/JKSS.2011.20.3.119
Overhaul and repair service means the sequential processes of disassembly, repair and reassembly for a product which has been used for a long time. Overhaul is required for the companies producing airplanes, ships, trains, military weapons and heavy industrial equipments which are very expensive and have a long life cycle. The most important performance measure of the overhaul repair shop is usually the lead time. Thus, how to design the manufacturing system to meet the delivery date is a major concern in overhaul repair shop. This paper introduces the case study of an overhaul repair shop producing military weapon systems with the 3D simulation tool,
. At first, the characteristics of overhaul shop and what should be considered for simulation modeling are explained. Then, various simulation scenarios including two types of disassembly systems, one is flow line system and the other is cell system, are discussed with the results of simulation experiments.