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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 9, Issue 4 - Dec 2000
Volume 9, Issue 3 - Sep 2000
Volume 9, Issue 2 - Jun 2000
Volume 9, Issue 1 - Mar 2000
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Improved Design of Engine Manufacturing Line Using Simulation
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 1~9
When a new manufacturing line is constructed, its production capacity can be substantially affected in its design stage. Computer simulation often provides better design by evaluating feasible alternatives. In this paper we study an automobile engine manufacturing line which is under construction. Three alternatives are considered in the design; (1) to use machining tools of longer life; (2) to reassign the buffer space to each sequential processes while maintaining the same total buffer length; and (3) to reduce the machine repair time to 30 minutes using TPM and maintenance team. Simulation results using AutoMod indicates that employing the three alternatives will save about 1.5 million dollars per year.
Load Balancing Analysis For (N＋1) Type Intelligent Network Service Systems
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 11~19
The main idea behind the Intelligent Networks (IN) concept is the separation of switching function from the service control, in order to meet various service requirements of subscribers and development of new services in time. The (N+l) architecture of the IN service system consists of front-end processors (FEP) and back-end processors (BEP), which is in service in a domestic telecommunication company, and balances the traffic load for services among the processors. Under this architecture, the IN service system can distribute the traffic load dynamically, and M services are easily launched and manipulated minimizing impacts on the existing services. This paper traces the performance of the (N＋1) structured system by means of the simulation approach, and shed a light on the result.
A Fuzzy Dispatching Algorithm with Adaptive Control Rule for Automated Guided Vehicle System in Job Shop Environment
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 21~38
A fuzzy dispatching algorithm with adaptable control scheme is proposed for more flexible and adaptable operation of AGV system. The basic idea of the algorithm is prioritization of all move requests based on the fuzzy urgency. The fuzzy urgency is measured by the fuzzy multi-criteria decision-making method, utilizing the relevant information such as incoming and outgoing buffer status, elapsed time of move request, and AGV traveling distance. At every dispatching decision point, the algorithm prioritizes all move requests based on the fuzzy urgency. The performance of the proposed algorithm is compared with several dispatching algorithms in terms of system throughput in a hypothetical job shop environment. Simulation experiments are carried out varying the level of criticality ratio of AGVs , the numbers of AGVs, and the buffer capacities. The rule presented in this study appears to be more effective for dispatching AGVs than the other rules.
GK-DEVS : Geometric and Kinematic DEVS for Simulation of 3 Dimensional Man-Made Systems
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 39~54
Presented in this paper is a modeling and simulation methodology for 3 dimensional man-made systems. Based on DEVS(discrete event system specification) formalism, we propose GK-DEVS (geometrical and kinematic DEVS) formalism to describe the geometrical and kinematic structure and continuous state dynamics. To represent geometry and kinematics, we add a hierarchical structure to the conventional atomic model. In addition, we employ the "empty event" and its external event function for continuous state changing. In terms of abstract simulation algorithm, the simulation method of GK-DEVS, named GK-Simulator, is proposed for combined discrete-continuous simulation. Using GK-DEVS, the simulation of an FMS(flexible manufacturing system) consisting of a luring machine, a 3-axis machine and a RGV-mounted robot has been peformed.en peformed.
A Study on Applying Complex System Theory to Land Warfare using EINSTein Model
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 55~66
This paper deals with complex system theory to describe land combat situation using EINSTein (Enhanced ISAAC Neural Simulation Tool) simulation model. Many studies have shown that existing Lanchester equations used in most wargame models does not describe changes of combat units, real land warfare situation and qualitative factors in combat. Future warfare will be a non-linear combat with various weapon system and complex combat units. EINSTein models is an agent-based simulation tool using complex system theory. We have compared and tested land combat results with Lanchester models and EINSTein models. The results have shown that EINSTein model has a possibility to apply and analyze land warfare more properly than Lanchester models.
Development of a Petri-net-based Simulation Software for Performance Evaluation of the System with Blocking and Deadlock
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 67~81
In this paper, a new software package for modeling and simulating discrete-event dynamic systems is developed. The new software is a general-purpose, graphical tool based on timed Petri-nets and is developed using Visual Basic and Visual C++ for the window environment. It allows the user to graphically build a Petri-net model and enter input data for executing the Petri-net simulation model. It is equipped with a deadlock detection and recovery function as well as an automatic error check function. In addition, the software supports various enabling functions and distribution functions and provides various statistics for the performance measures of interests pertaining to the system. We expect the new software will be used in a wide number of applications including computer, communication and manufacturing systems.
Development of a PC-based Excavator Simulator for Operator Training
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 83~91
Vehicle simulators provide an effective and safe environment for training operators. Many vehicle simulators have been developed but only a few have reached the stage of widely available tools; these tools are usually expensive and run on workstations only We have developed a low-cost, PC-based excavator simulator for training operators. Currently the simulator is dedicated to operating the boom, Em, bucket, and driver's cabin for digging by the action of the operator on two joysticks. This paper presents the implementation of the excavator simulator and some implementation results.
Simulation Optimization for Optimal at Design of Stochastic Manufacturing System Using Genetic Algorithm
Journal of the Korea Society for Simulation, volume 9, issue 1, 2000, Pages 93~108
The stochastic manufacturing system has one or more random variables as inputs that lead to random outputs. Since the outputs are random, they can be considered only as estimates of the true characteristics of the system. These estimates could greatly differ from the corresponding real characteristics for the system. Multiple replications are necessary to get reliable information on the system and output data should be analyzed to get optimal solution. It requires too much computation time practically, In this paper a GA method, named Stochastic Genetic Algorithm(SGA) is proposed and tested to find the optimal solution fast and efficiently by reducing the number of replications.