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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 17, Issue 4 - Dec 2008
Volume 17, Issue 3 - Sep 2008
Volume 17, Issue 2 - Jun 2008
Volume 17, Issue 1 - Mar 2008
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A Case Study of Simulation for the Design of Crankshaft Line in an Automotive Engine Shop
Moon, Dug-Hee ; Xu, Te ; Shin, Woo-Young ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 1~12
The major components of an engine are the cylinder block, cylinder head, crankshaft, connecting rod, and camshaft, which are more popularly known as the 5 C's. Thus, the engine shop usually consists of six sub-lines, including five machining lines and one assembly line. The flow line is the typical concept of the layout when the engineer designs the engine shop. This paper introduces a simulation study regarding the new crankshaft machining line in a Korean automotive factory. The major factors for designing the machining line are considered, and their effects on the system performance are evaluated with a three-dimensional(3D) simulation model that is developed with
. The initial layout is analyzed using the simulation model, and we suggest some ideas for improvement.
A Study on Buffered Deposition Device Structure to Improvement for High Density Chip Realiability
Kim, Hwan-Seog ; Yi, Cheon-Hee ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 13~19
New Buffered deposition is proposed to decrease junction electric field in this paper. Buffered deposition process is fabricated after first gate etch, followed NM1 ion implantation and deposition & etch nitride layer. New Buffered deposition structure has buffer layer to decrease electric field. Also we compared the hot carrier characteristics of Buffered deposition and conventional. Also, we design a test pattern including NMOSFET, PMOSFET, LvtNMOS, High pressure N/PMOSFET, so that we can evaluate DC/AC hot carrier degradation on-chip. As a result, we obtained 10 years hot carrier life time satisfaction.
Design and Implementation of Data Distribution Management Module for IEEE 1516 HLA/RTI
Ahn, Jung-Hyun ; Hong, Jeong-Hee ; Kim, Tag-Gon ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 21~29
The High Level Architecture(HLA) specifies a framework for interoperation between heterogeneous simulators, and Run-Time Infrastructure(RTI) is a implementation of the HLA Interface Specification. The Data Distribution Management(DDM) services, one category of IEEE 1516 HLA/RTI management services, control filters for data transmission and reception of data volume among simulators. In this paper, we propose design concept of DDM and show its implementation for light-weighted RTI. The design concept of DDM is to minimize total amount of message that each federate and a federation process generate using the rate of RTI service execution. The design of our proposed DDM follows that a data transfer mechanism is differently applied as the rate of RTI service execution. A federate usually publishes or subscribes data when it starts. The federate constantly updates the data and modifies associated regions while it continues to advance its simulation time. Therefore, the proposed DDM design provides fast update or region modification in exchange of complex publish and subscribe services. We describe how to process the proposed DDM in IEEE 1516 HLA/RTI and experiment variable scenarios while modifying region, changing overlap ratio, and increasing data volume.
Experiment and Simulation for Evaluation of Jena Storage Plug-in Considering Hierarchical Structure
Shin, Hee-Young ; Jeong, Dong-Won ; Baik, Doo-Kwon ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 31~47
As OWL(Web Ontology Language) has been selected as a standard ontology description language by W3C, many ontologies have been building and developing in OWL. The lena developed by HP as an Application Programming Interface(API) provides various APIs to develop inference engines as well as storages, and it is widely used for system development. However, the storage model of Jena2 stores most owl documents not acceptable into a single table and it shows low processing performance for a large ontology data set. Most of all, Jena2 storage model does not consider hierarchical structures of classes and properties. In addition, it shows low query processing performance using the hierarchical structure because of many join operations. To solve these issues, this paper proposes an OWL ontology relational database model. The proposed model semantically classifies and stores information such as classes, properties, and instances. It improves the query processing performance by managing hierarchical information in a separate table. This paper also describes the implementation and evaluation results. This paper also shows the experiment and evaluation result and the comparative analysis on both results. The experiment and evaluation show our proposal provides a prominent performance as against Jena2.
Design of No-human-in-the-Loop Battleship Warfare M&S System applied to the Korea Yellow Sea Warfare Case using Agent-based Modeling
Chi, Sung-Do ; You, Yong-Jun ; Jung, Chan-Ho ; Lee, Jang-Se ; Kim, Jae-Ick ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 49~61
Most battleship warfare M&S systems run relatively slow and the simulation results are often unfair since the system should interact with human operators(controller and/or gamer). To deal with these problems, we have proposed the agent-based battleship warfare M&S system which interact with multiple agent systems instead of human operators. Agent-based M&S system may be able to efficiently support the analysis of effectiveness and/or the operational tactics development of given warfare by providing autonomous reasoning capabilities without the intervention of human controller. To do this, the paper propose the design concept and methodology using the advanced modeling and simulation framework as well as autonomous agent design principle. Several simulation tests performed on the battleship warfare case study on Korea Yellow sea will illustrate our techniques.
A Simulation Study for Evaluation of Alternative Plans and Making the Upper-limit for Improvement in Productivity of Flow-shop with Considering a Work-wait Time
Song, Young-Joo ; Woo, Jong-Hun ; Lee, Don-Kun ; Shin, Jong-Gye ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 63~74
The design of best efficient production process is common requirements of the production strategy department and the process planning department to maximize the revenue and accomplish target production volumes in the production periods. And they use several general methods for that-line-balancing, removing of the bottle-neck process, facility ramp-up, increasing of the worker's utilization, etc. But, those methods have depended on analytic, static and arithmetic calculations, yet. So, irregular work-waiting time causing the delay time isn't include in extracting production capacity, especially in the line production process. The work-waiting time is changed irregularly along the variation of each machine and very important for calculate real product lead-time and forecasting target production volumes. At this thesis, i'm going to mention the importance of the delay time of conveyor system which can be extracted by discrete-event simulation. And suggest it as a new main variable that must be considered at designing new production system. Then experimented and tested that's effects in the H-company case, conveyor based line production process.
Analysis of Unobservable RSS Queueing Systems
Park, Jin-Soo ; Kim, Yun-Bae ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 75~82
The times of service commencement and service completion had been used for inferring the queueing systems. However, the service commencement times are difficult to measure because of unobservable nature in queueing systems. In this paper, for inferring queueing systems, the service commencement times are replaced for arrival times which can be easily observed. Determining the service commencement time is very important in our methods. The methods for first come first served(FCFS), last come first served(LCFS) queueing discipline are already developed in our previous work. In this paper, we extend to random selection for service(RSS) queueing discipline. The performance measures we used are mean queueing time and mean service time, the variances of two. The simulation results verify our proposed methods to infer queueing systems under RSS discipline.
Modeling and Simulation of security system using PBN in distributed environmen
Seo, Hee-Suk ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 83~90
We introduce the coordination among the intrusion detection agents by BBA(BlackBoard Architecture) that belongs to the field of distributed artificial intelligence. The system which uses BBA for the coordination can be easily expanded by adding new agents and increasing the number of BB(BlackBoard) levels. Several simulation tests performed on the targer network will illustrate our techniques. And this paper applies PBN(Policy-Based Network) to reduce the false positives that is one of the main problems of IDS. The performance obtained from the coordination of intrusion detection agent with PBN is compared against the corresponding non PBN type intrusion detection agent. The application of the research results lies in the experimentation of the various security policies according to the network types in selecting the best security policy that is most suitable for a given network.
Development of Multi-agent Based Deadlock-Free AGV Simulator for Material Handling System
Lee, Jae-Yong ; Seo, Yoon-Ho ;
Journal of the Korea Society for Simulation, volume 17, issue 2, 2008, Pages 91~103
In order to simulate the behavior of automated manufacturing systems, the performance of material handling systems should be measured dynamically. Multi-Agent technology could be well adapted for the development of simulator for distributed and intelligent manufacture systems. A multi-agent system is composed of one coordination agent and multiple application agents. Issues in AGVS simulator can be classified by the set-up and operating problems. Decisions on the number of vehicles, bi- or uni-directional guide-path, etc. are fallen into the set-up problem category, while deadlock tree algorithm and conflict resolution are in operating problem. In this paper, a multi-agent based deadlock-free simulator for automated guided vehicle system(AGVS) are proposed through the use of multi-agent technologies and the development of deadlock-free algorithm. In this AGVS simulator proposed, well-known Floyd algorithm is used to create AGVS Guide path, through which AGVS move. Also, AGVs avoid vehicle conflict and deadlock using check path algorithm. And Moving vehicle agents are operated in real-time control by coordination agent. AGV position is dynamically calculated based on the concept of rolling time horizon. Simulator receives and presents operating information of vehicle in AGVS Gaunt chart. The performance of the proposed algorithm and developed simulator based on multi-agent are validated through set of experiments.