• 전기전자학회논문지
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• 제6권1호
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• pp.1-9
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• 2002

통합 LAN은 다양한 트래픽을 수용해야 하므로 통합LAN의 성공적 개발을 위해서는 통합 LAN 구성을 분석하고 평가하는 것이 매우 중요하다. 본 논문에서는 SLAM II를 이용한 성능 분석 프로그램을 개발하고, 큐 관리 방식과 스케줄 알고리즘 등을 시뮬레이션 하였다. 시뮬레이션 결과, cyclic 서비스 알고리즘이 가중치에 의한 우선순위 알고리즘보다 성능에 더 큰 영향을 주는 것으로 평가되며, Back Pressure 구현은 큐 관리를 용이하게 할 수 있을 것으로 판단된다.

• 한국국방경영분석학회지
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• 제23권2호
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• pp.1-14
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• 1997

TPNSim++ is the object-oriented framework for the discrete event simulation of military systems, developed by authors. The simulation world view of TPNSim++ is on the basis of activity scanning. TPNSim++ is implemented as C++ class library under Windows 95/NT. It uses the extended timed Petri nets which are called TPNSim nets for simulation modeling tool. The aim of this study is to conduct a comparative study of TPNSim++ and SLAM II in the simulation of military maintenance systems for the validation and the applicability of TPNSim++. From this study, TPNSim++ and SLAMII have given the same results under the equivalent assumption. Thus we can get the validation of TPNSim++ and its applicability to the simulation of maintenance systems.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 1998년도 가을 학술발표논문집 Vol.25 No.2 (3)
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• pp.571-573
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• 1998

본 논문에서는 Ka-band을 On Board Processing기술로 이용하는 위성 B-ISDN 중계망을 설계하였다. 지상망과의 연동을 위해 SDH 접속/관리, SSOH처리 방안 등에 대하여 기술하였다. 그리고 설계된 위성 중계망의 성능을 분석하기 위하여 SLAM II를 사용하여 시뮬레이터를 구성하였다. 시뮬레이션연구는 한국 실정을 고려한 Population-Distance-Gross group Product(PDG) 트래픽 모델에 위한 트래픽 값을 적용하였다. 그리고 시뮬레이션 연구 결과를 이용하여 제안된 위성 중계망과 다중 접속 프로토콜의 성능 특성을 고찰하였다.

• 한국시뮬레이션학회논문지
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• 제3권1호
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• pp.29-42
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• 1994

The architecture of a MIMD-type parallel computer system is specified: a simulator is developed to support design and evaluation of systems based on the architecture: and conducted with the simulator to evaluate system performance. The horizontal/vertical-bus(H/V-bus) system architecture provides an NxN array of processing elements which communicate with each other through a network of N horizontal buses and N vertical buses. The simulator, written in SLAM II and FORTRAN, is designed to provide high-resolution in simulating the IPC mechanism. Parameters provide the user with independent control of system size, PE speed and IPC mechanism speed. Results generated by the simulator include execution times, PE utilizations, queue lengths, and other data. The simulator is used to study system performance when a partial differential equation is solved by parallel Gauss-Seidel method. For comparisons, the benchmark is also executed on a single-bus system simulator that is derived from the H/V-bus system simulator. The benchmark is also solved on a single PE to obtain data for computing speedups. An extensive analysis of results is presented.

• 한국시뮬레이션학회논문지
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• 제3권1호
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• pp.89-98
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• 1994

In this paper, a criteria for selecting an appropriate load redistribution algorithm is devised so that a fault-tolerance distributed system can operte at its optimal efficience. To present the guideline for selecting redistributing algorithms, simulation models of fault-tolerant system including redistribution algorithms are developed using SLAM II. The job arrival rate, service rate, failure and repair rate of nodes, and communication delay time due to load migration are used as parameters of simulation. The result of simulation shows that the job arrival rate and the failure rate of nodes are not deciding factors in affecting the relative efficiency of algorithms. Algorithm B shows relatively a consistent performance under various environments, although its performance is between those of other algorithms. If the communication delay time is longer than average job processing time, the performance of algorithm B is better than others. If the repair rate is relatively small or communication delay time is longer than service time, algorithm A leads to good performance. But in opposite environments, algorithm C is superior to other algorithms.

• 한국시뮬레이션학회논문지
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• 제4권1호
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• pp.59-73
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• 1995

Local area networks(LANs) recently become so large that they exceed their architected limits and users on different LANs may need to talk each other. This trend has led to a growth in the practice of interconnecting many heterogeneous LANs. In this paper, we proposed a method to interconnect Ethernets and token rings, which are widely used today, through a fast FDDI network. We also developed a simulation tool to evaluate the performances of the interconnected networks. We used a simulation language SLAM II for modeling and OSF/MOTIF X-window for user interface. The developed tool can be used to make a decision which interconnecting method is suitable for a given environment before interconnecting many heterogeneous LANs.

• 전자공학회논문지A
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• 제33A권10호
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• pp.48-60
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• 1996

This paper focuses on the necessities of interworking and dervation of the requirements of interworking system for interworking between 64 Kbps based N-ISDN (narrowband ISDN) and B-ISDN(broadband ISDN). Furthermore, the design and the implementation of IWF (interworking function) are presentd. We analyze two ISDN signalling systems, and propose the architecture of interworking system. And then we make the baisc call procedure model between N-ISDN and B-ISDN, and verify the dynamic behaviors through the reachability tree of petri net. IWF is designed and implemented for transforming the differences between the two signalling systems. The operational confirmity of th eimplemented program was confirmed by the local test method. The performance of IWF was evaluated throguh the simulation language SLAM-II. As the result of evaluation shows, we confirm that the processing delay is maintained within 3 ms under the utilization 0.9.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1992년도 춘계공동학술대회 발표논문 및 초록집; 울산대학교, 울산; 01월 02일 May 1992
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• pp.466-475
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• 1992

ISDN으로 통합되고 있는 중요한 서비스 중의 하나가 데이터의 효율적인 전달을 위한 패킷모드 서비스이다. 이 패킷모드 서비스는 융통성이 있는 대역폭할당이 가능하고 하나의 물리적 채널을 동시에 복수개의 논리적 채널로 사용할 수 있다. CCITT권고안 X.31은 현존하고 있는 X.25패킷 터미날을 ISDN으로의 액세스를 지원하기 위한 두 가지의 시나리오를 설명하고 있다. ISDN교환기로서 개발되고 있는 TDX-10 전자교환기는 패킷처리기(Packet Handler)가 ISDN내에서 패킷모드 서비스를 제공하는 X.31의 Case B를 채택하고 있다. 본 논문에서는 모든 패킷 트래픽이 집중되어 처리되는 패킷처리기 역할을 하는 패킷처리 서브시스템(Packet Handling Subsystem)의 구조를 간략하게 설명하였다. 또한 TDX-10 패킷처리기의 성능을 제시하기 위하여 패킷처리기를 큐잉 네트워크를 이용하여 모델링하고, SLAM II를 사용하여 시뮬레이션을 수행하였다. 그 결과 부가된 트래픽 변화에 따른 각 프로세서의 CPU점유율 및 입력큐에서의 평균 대기시간, X.25호 요구 지연시간과 데이터 패킷 전송 지연시간등을 분석하고 이를 근거로 TDX-10 패킷교환시스팀의 패킷호 처리용량을 제시하였다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.470-472
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• 1996

POSCO has a plan for facility expansion in plate mill by building No.3 Plate Mill. By No.3 Plate Mill's coming on line, POSCO' current plate production of 2.3 million tons will increase by over 1 million tons to 3.36 million tons (Currently, annual domestic demand for plates is 4.42 million tons). With the plan of facility expansion, POSCO also has the plan of integrating the Plate Warehouse. But, we came to have a question whether the roller table from the mill to the warehouse could carry extended products. Engineers working in the mill wanted to install transfer facility to reduce the load of the roller table, but the engineers in facility purchasing team didn't want to buy the new facility. So, We needed to analyzed the material flow by simulation. The simulation was done on the VAX system by SLAM II. And this project was done by two engineers for 2 months. In the end, we concluded that two transfer facilities are needed for material flow with no bottle neck point.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1990년도 춘계공동학술대회논문집; 한국과학기술원; 28 Apr. 1990
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• pp.299-311
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• 1990

A computer simulation model is proposed for selecting effective agrees paths and estimating the evacuation time in case of evacuating all the residents of a building to the safe area. The physical structure of a building is formulated into a network. The followings are considered in the model : the congestion effect to the velocity, the behavioral pattern of the evacuees, and the probabilistic nature of the evacuation process. Coded in SLAM II/PC, the simulation model can generate the output such as evacuation time(max, average), utilization of exits, utilization of passages, floor clearance times, and bottleneck information. The "rigorous" validation of the proposed model is not completed yet but remains to be a future research topic.rch topic.