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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 2, Issue 1 - Dec 1993
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PETSIM : 생산시스템의 설계 및 분석을 위한 Simulation 도구
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 1~12
Simulation has been recognized as an invaluable tool in designing and analyzing manufacturing system. In this paper, a Petri net based simulation tool to facilitate the simulation project in manufacturing area is presented . To simulate a manufacturing system, three models are developed ; a Petrinet model, a monitor, and a token control function. While hardware objects in manufacturing systems are modeled by Petri net objects, cell level control functions are separately modeled and integrated with a Petri net model so that they resolve conflicts occuring in Petri net execution. The monitor is a model regarding the information flow between Petri nets and token control functions. The facilities of the developed tool are presented. Also, a modeling procedure with the tool is illustrated via a case study.
Performance Analysis of Bus Arbitration Schemes for Multiple-bus Multiprocessor System
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 13~22
In a multiple-bus multiprocessor system in which processors and memory modulus are interconnected through system buses, time delay due to bus contention degrades system performance. In order to reduce such a problem , and optimal bus arbitration scheme and its hardware are neccessary. In this study, performaces of four arbitration schemes are analyzed and compared : fixed-priority, equal-priority, rotating-priority and round-robin priority schemes. For the study, the software simulator of a multiple-bus multiprocessor system is developed by using SLAM II. Simulation results show that, when memory sccesses are evenly distributed to all memory modulus, round-robin priority scheme provides the best performance. But when a hot spot exists, the use of the fixed priority scheme results in the shortest access time.
Simulation based Automatic Knowledge Acquistion
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 23~30
Performance Evaluation of a Parallel DEVS Simulation Environment of P-DEVSIM ++
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 31~44
Zeigler's DEVS(Discrete Event Systems Specification) formalism supports formal specification of discrete event systems in a hierarchical , modular manner. Associated are hierarchical, distributed simulation algorithms, called abstract simulators, which interpret dynamics of DEVS models. This paper deals with performance evaluation of P-DEVSIM ++, a parallel simulation environment which implements the DEVS formalism and associated simulation algorithms in a parallel environment. Performance simulator has been developed and used to experiment models of parallel simulation executions in different conditions. The experimental result shows that simulation time depends on both the number of processors in the parallel system and the communication overheads among such processors.
Modelingof Prioritized Token Ring
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 46~54
Analytic and simulation models for prioritized token ring are presented in this paper. Its protocol is based on prioritized token ring with reservation (R-PTR). Since the protocol of the R-PTR is simple and the performance of the R-PTR is not inferior to that of the IEEE-PTR under almost all traffic load environments, we use the R-PTR as our token ring model. By using the properties of Markovian process, the expressions for average throughput and average packet transmission delay are derived. The results obtained from the analytic model are compared with that of the discrete event simulation model.
Numericla Solution for the Pontryagin's Maximum Principle Problem
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 55~66
Although the Pontryagin's maximum principle theory is widely applied in control problems, its contribution to the solution procedure have been restricted just to figure out the rough picture of true solutions, probably due to the complexity of the two-point boundary value problems. This paper discusses a numerical approach to solve the control problems in connection with the two -point boundary value problems. A model of labor management negotiation during a strike has been constructed and solved explicitly by us of DVCPR subroutine introduced in IMSL. The results have been turned out that the management is better increase wage very slowly during the strike period, while , on the labor side, it is more effective to show the high intensity of demonstration against the company at the outset and gradually decrease it.
A Causal Loop Analysis in Organization Theory : Simulating Lotka -Volterra Moel of Population Ecology Theory
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 67~77
Development of a User-friendly continuous-system
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 78~90
Analysis of transient Characteristics of Load Sharing Algorithms In Distributed Systems
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 91~106
Load sharing in distributed systems improves systems performance. Research in the field has been focused on steady state performance for load sharing algorithms. However, transient characteristics of such algorithms may be important in a distributed system in which workload for some node is changing. Simulation is the only means to analyze such characteristics. This paper presents a simulation-based analysis of the transient characteristics of four load sharing algorithms ; forward probing, reverse probing, symmetric probing, and multi-threshold symmetric probing algorithms. Discrete event system models for execution of the algorithms in a distributed system has been developed in a SIMSCRIOT II.5 environment. Simulation results indicate that the MSYM algorithm shows the shortest response time in the transient period.
Object -Oriented Simulation Approach for AGV Systems
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 107~124
This paper presents an object -oriented simulation approach. AgvTalk, to design and analze AGV system configuration and control. Smalltalk-80 is used as an implementation language in AgvTalk. AgvTalk includes 25 object classes and more than 300 object methods in its library. Compared to general purpose simulation languages. AgvTalk provides several important benefits. First, the hierarchical features and modularity create possibilities for the extension and reuse of simulation object components. This extensibility and reusability provide more flexible modeling capabilities for simulation of many alternative AGV systems. Second, detailed behavior of each object in the AGV system can be modeled easily and exactly in AgvTalk because there are no limiting modeling constructs. Third, AgvTalk provides a user -friendly simulation modeling environment through the MVC -triad of Smalltalk-80.
An Estimation of The Unknown Theory Constants Using A Simulation Predictor
Journal of the Korea Society for Simulation, volume 2, issue 1, 1993, Pages 125~133
A statistical method is described for estimation of the unknown constants in a theory using both of the computer simulation data and the real experimental data, The best linear unbiased predictor based on a spatial linear model is fitted from the computer simulation data alone. Then nonlinear least squares estimation method is applied to the real experimental data using the fitted prediction model as if it were the true simulation model. An application to the computational nuclear fusion devices is presented, where the nonlinear least squares estimates of four transport coefficients of the theoretical nuclear fusion model are obtained.