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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 21, Issue 4 - Dec 2012
Volume 21, Issue 3 - Sep 2012
Volume 21, Issue 2 - Jun 2012
Volume 21, Issue 1 - Mar 2012
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Simulation-based Design and Performance Analysis of Two Phase Banker's Algorithm for Efficient Operation of Capacitated Automated Production Systems
Shin, Hee Chul ; Choi, Jin Young ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 1~9
DOI : 10.9709/JKSS.2012.21.4.001
This paper suggests a two-phase look-ahead Banker's algorithm for efficient operation of capacitated automated production systems. The algorithm improves the ability of detecting safe states of the previous one by considering the possibility of processing each job to completion at once as well as partial movement between jobs. The improved performance of the proposed algorithm is testified by performing numerical experiment in terms of (i) detection rate of safe states and (ii) system throughput and verified by using paired t-test.
Comparison of DBR with CONWIP in a Production Line with Constant Processing Times
Lee, Hochang ; Seo, Dong-Won ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 11~24
DOI : 10.9709/JKSS.2012.21.4.011
We compared a DBR(drum-buffer-rope) system with a CONWIP(constant work-in-process) system in a production line with constant processing times. Based on the observation that a WIP-controlled line production system such as DBR and CONWIP is equivalent to a m-node tandem queue with finite buffer, we applied a max-plus algebra based solution method for the tandem queue to evaluate the performance of two systems. Numerical examples with 6 workstations were also used to demonstrate the proposed analysis. The mathematical analyses support that CONWIP outperforms DBR in terms of expected waiting time and WIP. Unlike the CONWIP case, sequencing workstations in a DBR affects the performance of the system. Delaying a bottleneck station in a DBR reduces expected waiting time.
Mission Task & Workload Analysis of Armed Helicopter
Park, Hyojin ; Lee, Jinwoo ; Lee, Minwoo ; Park, Sang C. ; Kwon, Yongjin ; Lee, Jonghoon ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 25~33
DOI : 10.9709/JKSS.2012.21.4.025
Armed helicopter is an integral part of armed forces, which conducts vital missions, such as anti-armor attack, close air support, escorting air assault operations, and reconnaissance. A typical cockpit arrangement of armed helicopters has been a tandem configuration. This is to reduce the frontal area, which in turn increases the forward speed as well as reduces the chance of being hit by enemy fires. However, many armed helicopters in the world are now being developed as a side-by-side configuration. Such configuration is quite different from the conventional cockpit arrangement in light of the crew communications and situational awareness. Therefore, the main objective of this study is to find the optimized combination of mission tasks among pilots in a side-by-side configuration cockpit by measuring the workload using the NASA Task Load Index method. The experimental results indicate that the workload of crew members differ as disparate tasks are being performed.
Logical Analysis of Real-time Discrete Event Control Systems Using Communicating DEVS Formalism
Song, Hae Sang ; Kim, Tag Gon ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 35~46
DOI : 10.9709/JKSS.2012.21.4.035
As complexity of real-time systems is being increased ad hoc approaches to analysis of such systems would have limitations in completeness and coverability for states space search. Formal means using a model-based approach would solve such limitations. This paper proposes a model-based formal method for logical analysis, such as safety and liveness, of real-time systems at a discrete event system level. A discrete event model for real-time systems to be analyzed is specified by DEVS(Discrete Event Systems Specification) formalism, which specifies a discrete event system in hierarchical, modular manner. Analysis of such DEVS models is performed by Communicating DEVS (C-DEVS) formalism of a timed global state transition specification and an associated analysis algorithm. The C-DEVS formalism and an associated analysis algorithm guarantees that all possible states for a given system are visited in an analysis phase. A case study of a safety analysis for a rail road crossing system illustrates the effectiveness of the proposed method of the model-based approach.
Performance Analysis of Hierarchical Routing Protocols for Sensor Network
Seo, Byung-Suk ; Yoon, Sang-Hyun ; Kim, Jong-Hyun ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 47~56
DOI : 10.9709/JKSS.2012.21.4.047
In this study, we use a parallel simulator PASENS(Parallel SEnsor Network Simulator) to predict power consumption and data reception rate of the hierarchical routing protocols for sensor network - LEACH (Low-Energy Adaptive Clustering Hierarchy), TL-LEACH (Two Level Low-Energy Adaptive Clustering Hierarchy), M-LEACH (Multi hop Low-Energy Adaptive Clustering Hierarchy) and LEACH-C (LEACH-Centralized). According to simulation results, M-LEACH routing protocol shows the highest data reception rate for the wider area, since more sensor nodes are involved in the data transmission. And LEACH-C routing protocol, where the sink node considers the entire node's residual energy and location to determine the cluster head, results in the most efficient energy consumption and in the narrow area needed long life of sensor network.
Simulation Analysis for a Partial Appointment System of Outpatients in a Private Clinic
La, Soonyoung ; Jeong, Byung Ho ; You, Taiwoo ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 57~64
DOI : 10.9709/JKSS.2012.21.4.057
The waiting time of patients is an important factor related with service quality of a hospital system. An appointment system of patients is not popular, in special, in a private hospital. An appointment system is expected to diversify patients in time and to reduce patient's waiting time. Three appointment rules are suggested and analyzed to compare the waiting time of appointment and walk-in patients using simulation analysis. The results of two way ANOVA show that the time slot of 30 minutes for allocating appointment patients is better than the time slot of 60 minites in view of patient's waiting time. The results of the appointment level 1 also show that the constant pattern rule and the zigzag pattern rule give shorter waiting time for walk-in patient and for appointment patient, respectively.
The Battle Warship Simulation of Agent-based with Reinforcement and Evolutionary Learning
Jung, Chan-Ho ; Park, Cheol-Young ; Chi, Sung-Do ; Kim, Jae-Ick ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 65~73
DOI : 10.9709/JKSS.2012.21.4.065
Due to the development of technology related to a weapon system and the info-communication, the battle system of a warship has to manage many kinds of human intervention tactics according to the complicated battlefield environment. Therefore, many kinds of studies about M&S(Modeling & Simulation) have been carried out recently. The previous M&S system based on an agent, however, has simply used non-flexible(or fixed) tactics. In this paper, we propose an agent modeling methodology which has reinforcement learning function for spontaneous(active) reaction and generation evolution learning Function using Genetic Algorithm for more proper reaction for warship battle. We experiment with virtual 1:1 warship combat simulation on the west sea so as to test validity of our proposed methodology. We consequently show the possibility of both reinforcement and evolution learning in a warship battle.
Virtual Simulation for Assembly and Maintenance Tasks
Park, Young-Keun ; Ju, Hyun-Jun ; Kim, Cheon-Young ; Jung, Na-Hyeon ; Lee, Jun-Kyu ; Lee, In-Won ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 75~80
DOI : 10.9709/JKSS.2012.21.4.075
This paper describes the development and applications of maintainability simulation system based on virtual reality technology. The immersive type maintainability simulator using virtual reality is developed and assembly simulation using DELMIA software is conducted for an air-to-ground munition as an example. The simulation processes and result validate the feasibility and effectiveness of maintainability simulation system for logistic element development.
A Study on Agent based Simulation System Architecture for the Engagement of Ground Weapon Systems
Hwam, Won K. ; Chung, Yongho ; Na, Jaeho ; Park, Sang C. ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 81~90
DOI : 10.9709/JKSS.2012.21.4.081
Presented in this paper is a study for construction of a simulation system for the engagement of ground weapon systems. This paper proposes architecture for the simulation system based on agent simulation design methodology. Every entity of the proposed architecture is developed by assembling modularized agent components, and it enhances the reusability and composability of the entity. Consequently, time, costs, and efforts that are required to develop a new simulation system is able to be reduced by the enhancement. In the case of ground engagement simulation, it is very important to reflect environmental effects. Synthetic battlefield of the proposed architecture has environmental data of the battlefield and interacts with entities in the simulation system. The proposed architecture based simulation system can build swiftly various simulation models by the objectives and derive reasonable results from behaviors of entities that include environmental effects. This paper contains the construction of an example system based on the proposed architecture to verify the advantages of the architecture.
A Method for Quantifying the Risk of Network Port Scan
Park, Seongchul ; Kim, Juntae ;
Journal of the Korea Society for Simulation, volume 21, issue 4, 2012, Pages 91~102
DOI : 10.9709/JKSS.2012.21.4.091
Network port scan attack is the method for finding ports opening in a local network. Most existing IDSs(intrusion detection system) record the number of packets sent to a system per unit time. If port scan count from a source IP address is higher than certain threshold, it is regarded as a port scan attack. The degree of risk about source IP address performing network port scan attack depends on attack count recorded by IDS. However, the measurement of risk based on the attack count may reduce port scan detection rates due to the increased false negative for slow port scan. This paper proposes a method of summarizing 4 types of information to differentiate network port scan attack more precisely and comprehensively. To integrate the riskiness, we present a risk index that quantifies the risk of port scan attack by using PCA. The proposed detection method using risk index shows superior performance than Snort for the detection of network port scan.