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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society for Simulation
Journal Basic Information
Journal DOI :
The Korea Society for Simulation
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Volume & Issues
Volume 14, Issue 3 - Dec 2005
Volume 14, Issue 4 - Dec 2005
Volume 14, Issue 2 - Jun 2005
Volume 14, Issue 1 - Mar 2005
Selecting the target year
Making Semiconductor Production Plan using the past marketing pattern reference
Park, Dong-Sik ; Han, Young-Shin ; Lee, Chil-Gee ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 1~12
Designing a production and equipment investment plan for semiconductors, many variables must be taken into account. However, depending on these variables could bring many changes to the plans, and the end result is hard to predict. Because it's hard to predict the end result, it's never easy to make a standard production plan. So, the goal of this project is to design a production plan based on past marketing patterns to satisfyall the variables and come up with a reasonable thesis on a standardized process.
A Study on the Improvement of Database Construction using ENC and DTED
Kim, Won-Ouk ; Kim, Jong-Su ; Hong, Jeong-Hyuk ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 13~19
Path-finding by using generalized visibility graphs in computer game environments
Yu, Kyeon-Ah ; Jeon, Hyun-Joo ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 21~31
In state-of-the-art games, characters can move in a goal-directed manner so that they can move to the goal position without colliding obstacles. Many path-finding methods have been proposed and implemented for these characters and most of them use the A* search algorithm. When .the map is represented with a regular grid of squares or a navigation mesh, it often takes a long time for the A* to search the state space because the number of cells used In the grid or the mesh increases for higher resolution. Moreover the A* search on the grid often causes a zigzag effect, which is not optimal and realistic. In this paper we propose to use visibility graphs to improve the search time by reducing the search space and to find the optimal path. We also propose a method of taking into account the size of moving characters in the phase of planning to prevent them from colliding with obstacles as they move. Simulation results show that the proposed method performs better than the grid-based A* algorithm in terms of the search time and space and that the resulting paths are more realistic.
Simulation for the Efficient Utilization of Energy in Wireless Sensor Network
Baeg, Seung-Beom ; Cho, Tae-Ho ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 33~42
One of the imminent problems to be solved within wireless sensor network is to balance out energy dissipation among deployed sensor nodes. In this paper, we present a transmission relay method of communications between BS (Base Station) and CHs (Cluster Heads) for balancing the energy consumption and extending the average lifetime of sensor nodes by the fuzzy logic application. The proposed method is designed based on LEACH protocol. The area deployed by sensor nodes is divided into two groups based on distance from BS to the nodes. RCH (Relay Cluster Head) relays transmissions from CH to BS if the CH is in the area far away from BS in order to reduce the energy consumption. RCH decides whether to relay the transmissions based on the threshold distance value that is obtained as a output of fuzzy logic system, Our simulation result shows that the application of fuzzy logic provides the better balancing of energy depletion and prolonged lifetime of the nodes.
A Study for Design of Distribution Center using Compromise Programming
Heo Byoung-Wan ; Lee Hong-Chul ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 43~54
For the effective design of automated distribution center composed of Automated Storage/Retrieval System, Automated Guided Vehicle System, and Conveyor System, we proposed an analysis method to determining. design and control parameters with multiple performance objectives using Compromise Programming, which can resolve the dilemma of conflicting objectives. The Evolution Strategy generates the optimal solutions for each objectives. The Analytic Hierarchy Process selects the best solution among the alternatives generated from Evolution Strategy. The Regression Analysis formulates the objective functions for each objectives. By reducing deviations between goal values and target values generated from Analytic Hierarchy Process, Compromise Programming determines design and control parameters by compromising the multiple objectives formulated using Regression Analysis. When the parameters of system are changed, this proposed analysis method has a benefit of reducing costs and time without repeating whole simulation run.
A Framework for VR Effects with Multi-sensory Motional Display
Yoo, Byoung-Hyun ; Han, Soon-Hung ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 55~66
Virtual reality (VR) simulators have been extended to transfer knowledge and education, and demands for exhibition systems for science education and cultural experiences has also increased. Existing VR simulators, which are based on the dynamics equations of motion, cannot easily be adapted to changes in simulation contents. In order to effectively transfer knowledge and maintain interests through educational applications, an experiential system that has multi-sensory effects as well as motion effects is required. In this study, we designed and implemented a motion generation that is tailored to experiential exhibition systems and multi-sensory VR effects. Both the sense of motion which is generated from the movement of the viewpoint of the visual image, and motion effects which are constructed in advance, are applied to motion simulation. Motion effects which occur during interaction between the user and the exhibition system can be easily added. Various sensory cues that are appropriate to the exhibition system are also considered.
Simulation Anaysis for Determining Location and Size of Logistic Network
Jeong, Suk-Jae ; Lee, Jae-Jun ; Kim, Kyung-Sup ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 67~77
Logistics network of the enterprise is defined to determine the optimal node and link considering the production, inventory and transportation based on the demand forecasting. This study consider the optimal logistics network of A painter company which maintain the existing transportation network and plan to relocate its plants and build new distribution centers. For this, we design possible alternative scenarios and install the simulation models for analysis of each scenario. The result of simulation will help the proper logistic network and determining the size of distribution center further.
Development of Traffic Simulation Using High Level Architecture/Run Time Infrastructure
Lee, Sang-Heon ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 79~90
There are plenty of optimization models for the signal-system of a single intersection and area traffic. Some of those models are adopted for the real traffic signal control system. The simulators for a single crossroad have been developed, so that we could evaluate optimization models and traffic control systems. However, the simulators for the area traffic are still being developed. Therefore, there are many limitations in the analysis and evaluation for area traffic control system. The area traffic is consisted of several intersections which are very complicated and many traffic strategies are adopted for the control system. This paper features an effective area traffic control system based on the High Lever Architecture(HLA). In this paper, we discuss the design of HLA-based area traffic control simulation. We describe technical motivations for the HLA, the key elements of the architecture and how they are minimum and essential to the goal of reuse and interoperability. A distributed simulation with HLA/RTI provides stable and satisfactory experimental results. Moreover, the prototype traffic control system provides reliable accomplishment compared to the NETSIM and TRANSYT-7F models.
Service Prediction-Based Job Scheduling Model for Computational Grid
Jang Sung-Ho ; Lee Jong-Sik ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 91~100
Grid computing is widely applicable to various fields of industry including process control and manufacturing, military command and control, transportation management, and so on. In a viewpoint of application area, grid computing can be classified to three aspects that are computational grid, data grid and access grid. This paper focuses on computational grid which handles complex and large-scale computing problems. Computational grid is characterized by system dynamics which handles a variety of processors and jobs on continuous time. To solve problems of system complexity and reliability due to complex system dynamics, computational grid needs scheduling policies that allocate various jobs to proper processors and decide processing orders of allocated jobs. This paper proposes a service prediction-based job scheduling model and present its scheduling algorithm that is applicable for computational grid. The service prediction-based job scheduling model can minimize overall system execution time since the model predicts the next processing time of each processing component and distributes a job to a processing component with minimum processing time. This paper implements the job scheduling model on the DEVS modeling and simulation environment and evaluates its efficiency and reliability. Empirical results, which are compared to conventional scheduling policies, show the usefulness of service prediction-based job scheduling.
Simulation of Slotted CSMA/CA MAC in IEEE 802.15.4 WPAN
Lee Hae Rim ; Chung Min Young ; Lee Tae-Jin ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 101~108
IEEE 802.15.4 low-rate Wireless Personal Area Networks (WPAN) are expected to provide ubiquitous networking between small personal/home devices and sensors with low power consumption and low cost features. The technology employs special CSMA/CA (Carrier Sense Multiple Access/collision Avoidance) to save power consumption for small or portable WPAN-enabled devices. In this paper, we simulation the slotted CSMA/CA of IEEE 802.15.4 MAC and evaluate its performance limit in order to grasp the characteristics of Medium Access Control (MAC) of IEEE 802.15.4 WPAN.
Performance Analysis of A Shuttle Carrier at Automated Container Terminal
Ha, Tae-Young ; Choi, Yong-Seok ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 109~118
The purpose of this paper is to analyze transport ability of AGV(Automated Guided Vehicle) and SHC(SHuttle Carrier). The main difference between two types of transport vehicles is that AGV depends on container crane or transfer crane to do loading/unloading container, but SHC is very independent to it. Therefore, the transport ability of SHC is expected to be higher than AGV. So, in this paper, we established simulation model to evaluate two types of transport vehicles and analyzed the results. Simulation model was established to automated container terminal with perpendicular yard layout, and applied closed loop operation of transport vehicle between apron and stacking yard. In the result, SHC showed very superior than AGV aspect of container crane productivity and vehicle fleets.
sPAC(Web Services Performance Analysis Center): A performance-aware web service composition tool
Chang, Hee-Jung ; Song, Hyung-Ki ; Lee, Kang-Sun ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 119~127
Web services and their composition (web processes) are promising technologies to efficiently integrate disparate software components over various types of systems. As many web services are nowadays available on Internet, quality of services (QoS) and performance/cost become increasingly important to differentiating between similar service providers. In this work, we introduce sPAC (Web Services Performance Analysis Centre) and show how customers can benefit from sPAC to consider performance in composing and commercializing web services. sPAC 1) helps users to graphically describe the workflow of web services, 2) invokes web services to test out performance for light load conditions, 3) automatically converts the web services and the flow between them into a simulation model, 4) conducts extensive simulations for heavy load conditions and various usage patterns, and 5) reports analysis results and estimation data for the web services.
Efficiency of Estimation for Parameters by Use of Variance Reduction Techniques
Kwon Chi-myung ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 129~136
We develop a variance reduction technique applicable in one simulation experiment whose purpose is to estimate the parameters of a first order linear model. This method utilizes the control variates obtained during the course of simulation run under Schruben and Margolin's method (S-M method). The performance of this method is shown to be similar in estimating the main effects, and to be superior to S-M method in estimating the overall mean response in a given model. We consider that a proposed method may yield a better result than S-M method if selected control variates are highly correlated with the response at each design point.
A Technique of Calculating a Weighted Euclidean Distance with a Personalized Feature Set in Parametric Signature Verification
Kim, Seong-Hoon ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 137~146
In parametric approach to a signature verification, it generally uses so many redundant features unsuitable for each individual signature that it causes harm, instead. This paper proposes a method of determining personalized weights of a feature set in signature verification with parametric approach by identifying the characteristics of each feature. For an individual signature, we define a degree of how difficult it is for any other person to forge the one's (called 'DFD' as the Degree of Forgery Difficulty). According to the statistical characteristics and the intuitional characteristics of each feature, the standard features are classified into four types. Four types of DFD functions are defined and applied into the distance calculation as a personalized weight factor. Using this method, the error rate of signature verification is reduced and the variation of the performance is less sensitive to the changes of decision threshold.
A Structural Representation of Handwritings for Automatic On-line Signature Verification
Kim, Seong-Hoon ;
Journal of the Korea Society for Simulation, volume 14, issue 3, 2005, Pages 147~154
In conventional approaches such as a functinal approach or a parametric approach to online signature verification, which could not deal with the local shape of signature, much various important informations inherent in the local part of signature shape have been overlooked. In this paper, we try a structural approach in which a signature is represented as a structural form of handwriting primitives and the local parts along a signature handwriting can be selectively compared according to their discrimination power in the process of signature verification, As a result, the error rate is diminished in the case that the weights of subpattern units is applied into comparing process, which is the degree of discrimination power of local part. And also, the global variation and complexity of each signature extracted from the analysis of local shape is found useful in determining the decision threshold more precisely.