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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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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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A Simulation Model for the Study of the Territorial Behavior of Subterranean Termites
Jeon, Won-Ju ; Lee, Sang-Hee ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 1~9
DOI : 10.9709/JKSS.2012.21.2.001
Subterranean termites forage by constructing tunnel networks in soil and encounter food resources during tunnel excavation. Some species of termites can travel up to 150 m underground. They often travel to the surface to find wood cellulose to feed their colony, which in turn causes extensive damage to wooden architecture, such as timber-frame houses. This type of damage has been constantly increasing along with global warming because higher temperatures provide an ecological niche for termites. The damage is closely related to termite territory size and distribution. Recently, as a way to research termite control, the necessity of a mathematical model to simulate termite territory formation in relation to damage has increased. So far, however, few studies have been conducted on the development of a model because it is difficult to quantify or characterize the relationship between territorial behavior and field conditions including complicated environmental factors. In the present study, we suggest a simulation model of the territoriality of the Formosan subterranean termites, Coptotermes formosanus (Shiraki), and Reticulitermes flavipes (Kollar), based on empirical data. The model consists of 2 procedures. One describes tunnel network growth for each colony, and the other represents territoriality based on tunnel-tunnel interactions between different colonies. Using the model, we show changes in territorial competition according to the termination probability of tunnel growth.
A Study on the Terrain Information Effects in Combat Simulation
Kim, Gak-Gyu ; Choi, Kyung-Hwan ; Lee, Sang-Heon ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 11~17
DOI : 10.9709/JKSS.2012.21.2.011
The past combats depended often on a number of firepower and manpower. However, integrated decision support viewpoint from communications, surveillance, reconnaissance, intelligence and so forth in combats witnessed in the Gulf, the Middle East, and Afghanistan have changed the trends of combat. That is, the force multipliers which many support systems enhance the combat potential of the fighting forces significantly become big issues to win or not in that combat. According to changing recent combat trend, Lanchester's combat model is being challenged to develop keeping pace with the new trend. We approach this paper as mathematical modeling about how the effect of terrain affects in the combat. Terrain information is invisible, but it is necessary to consider for analysis of warfare. Additionally, tangible or intangible elements affecting to attrition coefficients are continuely reflected to the combat model from decision-makers, then it will be a model closer to the reality and very suggestive to the actual world.
Structured DEVS Formalism: A Structural Modelling Method of Discrete Event Systems
Song, Hae-Sang ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 19~30
DOI : 10.9709/JKSS.2012.21.2.019
In recent decades, it has been known that the Discrete Event System Specification, or DEVS, formalism provides sound semantics to design a modular and hierarchical model of a discrete event system. In spite of this benefit, practitioners have difficulties in applying the semantics to real-world systems modeling because DEVS needs to specify a large size of sets of events and/or states in an unstructured form. To resolve the difficulties, this paper proposes an extension of the DEVS formalism, called the Structured DEVS formalism, with an associated graphical representation, called the DEVS diagram, by means of structural representation of such sets based on closure property of set theory. The proposed formalism is proved to be equivalent to the original DEVS formalism in their model specification, yet the new formalism specifies sets in a structured form with a concept of phases, variables and ports. A simplified example of the structured DEVS with the DEVS diagram shows the effectiveness of the proposed formalism which can be easily implemented in an objected-oriented simulation environment.
The Development of a MATLAB-based Discrete Event Simulation Framework for the Engagement Simulations of the Weapon Systems
Hwang, Kun-Chul ; Lee, Min-Gyu ; Kim, Jung-Hoon ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 31~39
DOI : 10.9709/JKSS.2012.21.2.031
Simulation Framework is a basic software tool used to develop simulation applications. This paper describes the development of a discrete event simulation framework based on DEVS(Discrete EVent System Specification) formalism, using MATLAB language which is widely used in technical computing and engineering disciplines. The newly developed framework utilizing MATLAB object oriented programming combines the convenience of MATLAB language and the sophisticated architecture of the DEVS formalism. Hence, it supports the productivity, flexibility, extensibility that are required for the simulation application software development of the weapon systems engagement. Moreover, it promises a simulation application the increased the computation speed proportional to the number of CPU of a multi-core processor, providing the batch simulation functionality based on MATLAB parallel computing technology.
A Case Study for Modeling and Simulation Analysis of the In-Line EFEM Cluster Tool Architecture
Han, Yong-Hee ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 41~50
DOI : 10.9709/JKSS.2012.21.2.041
In this study we first explain details of the semiconductor manufacturing processes and cluster tools. Then we discuss the problems in current fab layout and cluster tool architecture. As a solution to these problems, we propose the ILE (In-Line EFEM) architecture in which wafer movements are conducted through interconnected EFEMs (Equipment Front End Modules) instead of AMHS (Automated Material Handling System). Then we model the pilot ILE system using discrete event simulation and analyze the cycle time. Finally we compare three different scenarios of equipment layout in the ILE system in terms of cycle time.
Throughput Analysis of Non-Transparent Mode in IEEE 802.16j Mobile Multi-Hop Relay Networks
Lee, Ju-Ho ; Lee, Goo-Yeon ; Jeong, Choong-Kyo ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 51~58
DOI : 10.9709/JKSS.2012.21.2.051
In IEEE 802.16j MMR protocol, two modes about usage of RS are proposed; one is transparent mode to enhance data throughput and the other is non-transparent mode to extend coverage. In this paper, we focus on non-transparent mode and find that the mode can also improve data throughput. Therefore, we analyze data throughput on various RS topology and their extended coverage area by simulation in IEEE 802.16j non-transparent mode. We also compare the simulation results with the single MR-BS system of which coverage is extended by higher transmission power. From the comparisons of simulation results, we see that higher throughput can be obtained in the proposed non-transparent mode.
Dynamic Available-Resource Reallocation based Job Scheduling Model in Grid Computing
Kim, Jae-Kwon ; Lee, Jong-Sik ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 59~67
DOI : 10.9709/JKSS.2012.21.2.059
A grid computing consists of the physical resources for processing one of the large-scale jobs. However, due to the recent trends of rapid growing data, the grid computing needs a parallel processing method to process the job. In general, each physical resource divides a requested large-scale task. And a processing time of the task varies with an efficiency and a distance of each resource. Even if some resource completes a job, the resource is standing by until every divided job is finished. When every resource finishes a processing, each resource starts a next job. Therefore, this paper proposes a dynamic resource reallocation scheduling model (DDRSM). DDRSM finds a waiting resource and reallocates an unfinished job with an efficiency and a distance of the resource. DDRSM is an efficient method for processing multiple large-scale jobs.
Comparison Study of Helper Node Selection Schemes of Cooperative Communications at Ad Hoc Networks
Jang, Jae-Shin ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 69~78
DOI : 10.9709/JKSS.2012.21.2.069
In this paper, a study on finding an appropriate helper node that can help increase effective frame transmission rate for cooperative communications at ad hoc networks is carried out. Those researches from reference use the reactive helper node selection mechanism which starts its role after exchanging RTS and CTS frames between source and destination nodes, and are implemented into our simulator for performance comparison. System throughput and average channel access delay are used for performance measures and all communicating nodes are assumed to move independently within the communication range. It is anticipated that this research result can be used as basic information for designing a new efficient helper node selection scheme.
Fault Detection of Unbalanced Cycle Signal Data Using SOM-based Feature Signal Extraction Method
Kim, Song-Ee ; Kang, Ji-Hoon ; Park, Jong-Hyuck ; Kim, Sung-Shick ; Baek, Jun-Geol ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 79~90
DOI : 10.9709/JKSS.2012.21.2.079
In this paper, a feature signal extraction method is proposed in order to enhance the low performance of fault detection caused by unbalanced data which denotes the situations when severe disparity exists between the numbers of class instances. Most of the cyclic signals gathered during the process are recognized as normal, while only a few signals are regarded as fault; the majorities of cyclic signals data are unbalanced data. SOM(Self-Organizing Map)-based feature signal extraction method is considered to fix the adverse effects caused by unbalanced data. The weight neurons, mapped to the every node of SOM grid, are extracted as the feature signals of both class data which are used as a reference data set for fault detection. kNN(k-Nearest Neighbor) and SVM(Support Vector Machine) are considered to make fault detection models with comparisons to Hotelling's
Control Chart, the most widely used method for fault detection. Experiments are conducted by using simulated process signals which resembles the frequent cyclic signals in semiconductor manufacturing.
Study on Integrated Storage Systems for Automobile Production
Ok, Chang-Hun ; Kim, Duk-Su ; Gong, Jung-Su ; Seo, Yoon-Ho ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 91~101
DOI : 10.9709/JKSS.2012.21.2.091
Automobile manufacturing consists of body-line, painting-line, and assembly-line. These production lines are disposed in series and go through a flow process, so according to the status of pre & post processing, a suspension happens in a line by a starvation(impossibility of production by insufficient supply) or blocking(impossibility of production by exceed capacity). Therefore, to prevent a loss of production coming from a starvation or blocking, a storage such as WBS or PBS is independently owned and operated. The paper suggests the simulation model of integrated storage which can operate it by integrating each storage performing a role as a buffer of line. Specifically, the paper found the answers about reasonable number of Stacker Crane and AGV(Automatic Guided Vehicle) and suggested a methodology of operation which is available to operate them. Also, it compared an efficiency between a model of current storage and integrated storage through simulation. As a result, it turned out that the model suggested in the paper was more efficient on suspension of painting-line stop than a current storage.
Simulation Model for User-Perceived Service Availability
Ham, Young-Marn ; Lee, Kang-Won ;
Journal of the Korea Society for Simulation, volume 21, issue 2, 2012, Pages 103~112
DOI : 10.9709/JKSS.2012.21.2.103
Traditional system-oriented measures are no longer adequate to describe the availability perceived by the user. In this paper we investigate the service availability model and the user behavior graph. And we propose the simulation model, which determines the sevice availability considering user model, system model and service model at the same time. Through the example, we show how to construct the UBG of user model, system model and service model. And we investigate the effect of the parameters of system model and UBG on the service availability.