• Title, Summary, Keyword: simulation

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Integrated Simulation System of Aircraft

  • Wang, Xingren
    • Proceedings of the Korea Society for Simulation Conference
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    • pp.68-71
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    • 2001
  • Integrated Simulation System of Aircraft is a networked virtual synthetic environment. This paper presents hardware-in-the-loop simulation, man-in-the-loop simulation, computer generated aircraft, virtual prototype of aircraft dynamics, and networked simulation system.

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Effects of Web-based Simulation and High-fidelity Simulation of Acute Heart Disease Patient Care (급성 심장질환자 간호에 대한 웹기반 시뮬레이션과 고충실도 시뮬레이션 교육 효과)

  • Chu, Min Sun;Hwang, Yoon Young
    • The Journal of Korean Academic Society of Nursing Education
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    • v.23 no.1
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    • pp.95-107
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    • 2017
  • Purpose: The aim of this study was to assess the efficacy of web-based simulation and high-fidelity simulation on acute heart disease patient care. Methods: The project used a comparative study design with two simulation-based training modalities. A total of 144 nursing students participated in this study: 76 students in a web-based simulation, and 68 students in a high-fidelity simulation. Participants rated their self-efficacy, problem-solving ability, interest in learning, level of stress, satisfaction with the simulation experience, and level of difficulty of the simulation. Results: The scores for self-efficacy, problem-solving ability, and interest in learning including interest in clinical training in the high-fidelity simulation group was higher than in the web-based simulation group. However, there were no significant differences in interest in learning, including interest in nursing knowledge, and in lab training, level of stress, satisfaction with the simulation experience, and level of difficulty of the simulation. Conclusion: A high-fidelity simulation of acute heart disease patient care might be beneficial to developing many more abilities for nursing students than would a web-based simulation. Also, since the web-based simulation improved interest in nursing knowledge, it could be a viable alternative to high-fidelity simulation. Further study is needed to verify the effects of varied levels of simulation-based care with more rigorous outcomes.

A Simulation Modeling Methodology by Integrating Distributed Simulation Objects on the Web (웹상에 분산되어 있는 시뮬레이션 객체들의 통합에 의한 시뮬레이션 모델링 방법론)

  • 심원보;이영해
    • Proceedings of the Korea Society for Simulation Conference
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    • pp.325-330
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    • 1999
  • Web-based simulation is one of the most interesting field of simulation research today. Among many research area of web-based simulation, we concern about what a effective way of building simulation model is since creating comprehensive simulation models can be expensive and time consuming. So this paper discusses how to integrate distributed simulation sub-models as objects for constructing the required simulation model which is more large and complex. We introduce two web-oriented methodologies (such as JIDL, CORBA) and the concepts of agent for assisting modelers to integrate simulation models scattered over the web. SINDBAD, which we designed, is a simulation environment which makes it possible constructing a simulation model with distributed model objects on the web and performing the parallel simulation in a distributed way. It is organized according to design patterns in the object oriented concept. Actually we are on the premise that all the distributed objects are originally composed in a CORBA-compatible way to start with our prototype of SINDBAD.

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Methods for the Modularization of Simulation Model and the Management Scheme of Simulation Scenario for Shipbuilding Process Planning (조선 공정 계획을 위한 시뮬레이션 모델의 모듈화 및 시나리오 처리 방법론)

  • Cha, Ju-Hwan;Ku, Nam-Kug;Roh, Myung-Il;Cho, Doo-Yeoun;Lee, Kyu-Yeul
    • Korean Journal of Computational Design and Engineering
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    • v.17 no.1
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    • pp.17-25
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    • 2012
  • Recently, requests for accurate process planning using simulation have been increasing in many engineering fields including the shipbuilding industry, and many application systems for simulation have been developed. It is difficult, however, for a user to reuse the developed systems, because simulation models in the system are defined by its own method. In addition, the simulation model should be modified whenever a simulation sequence, which is called simulation scenario, is changed. Therefore, in this study, an elementary simulation object is proposed to modularize a simulation model. And the management scheme of simulation scenario is proposed to manage the scenario outside of the simulation models. Also, a simulation template is proposed to increase the development efficiency. To verify the efficiency of the proposed methods, application examples for shipbuilding process planning are implemented.

Performance Improvement of ASIP Assembly Simulator Using Compiled Simulation Technique (컴파일방식 시뮬레이션 기법을 이용한 ASIP 어셈블리 시뮬레이터의 성능 향상)

  • 김호영;김탁곤
    • Journal of the Korea Society for Simulation
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    • v.12 no.2
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    • pp.45-53
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    • 2003
  • This paper presents a retargetable compiled assembly simulation technique for fast ASIP(application specific instruction processor) simulation. Development of ASIP which satisfies design requirements in various fields of applications such as telecommunication, wireless network, etc. needs formal design methodology and high-performance relevant software environments such as compiler and simulator In this paper, we employ the architecture description language(ADL) named ${HiXR}^2$ to automatically synthesize an instruction-level compiled assembly simulator. A compiled simulation has benefit of time efficiency to interpretive one because it performs instruction fetching and decoding at compile time. Especially, in case of assembly simulation, instruction decoding is usually a time-consuming job(string operation), so the compiled simulation of assembly simulation is more efficient than that of binary simulation. Performance improvement of the compiled assembly simulation based on ${HiXR}^2$ is exemplified with an ARM9 architecture and a CalmRISC32 architecture. As a result, the compiled simulation is about 150 times faster than interpretive one.

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Fire Simulations (화재시뮬레이션)

  • Kim Sang-Moon;Yoon Sang-Youl;Kim Kyung-Chun
    • Journal of the Korean Society of Visualization
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    • v.4 no.1
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    • pp.8-13
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    • 2006
  • Fire simulation has been developed for decades to analyze fire cases and provide a tool to study fundamental fire dynamics and combustion. There are three way of fire simulation which are a full scale simulation, an experimental simulation and a computational simulation. In case of a full scale simulation, because a higher cost, a higher risk, more efforts are needed, a demand for it has been decreased. But recently a demand for an experimental simulation and a computational simulation has been increased. A computational simulation has several advantages; lower cost, short period, many case studies, more visual results, a quantitative result and etc. FDS(Fire Dynamics Simulator) which has been developed in BFRL(Building and Fire Research Laboratory), NIST(National Institute of Standards and Technology) is a popular world wide code for fire simulation. Lack of accurate predictions by the model could lead to erroneous conclusions with regard to fire safety. All results should be evaluated by the informed judgment of the qualified user.

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Distributed Web-based Simulation with Server Application Approach using Callback Mechanism

  • Shim, Won-Bo
    • Proceedings of the Korea Society for Simulation Conference
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    • pp.152-157
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    • 1999
  • In this paper, we introduce the concept of web-based simulation and some reviews on the distributed simulation on the World Wide Web (WWW) and classify the features of current web-based simulation under the distributed way. And then we suggest the structure of distributed web-based simulation which can achieve parallel simulation and reduce simulation run time and show how the callback mechanism works to enable the distributions of jobs to clients with push service in Remote Method Invocation (RMI). Finally we present a prototype of distributed web-based simulation.

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Combined Discrete-Continuous Modeling for Supply Chain Simulation

  • Cho, Min-Kwan;Lee, Young-Hae;Kim, Seo-Jin
    • Proceedings of the Korea Society for Simulation Conference
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    • pp.405-424
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    • 2001
  • Many simulation models have been built to facilitate simulation technique in designing, evaluating, and optimizing supply chains. Simulation is preferred to deal with stochastic natures existing in the supply chain. Moreover simulation has a capability to find local optimum value within each component through entire supply chain. Most of supply chain simulation models have been developed on the basis of discrete-event simulation. Since supply chain systems are neither completely discrete nor continuous, the need of constructing a model with aspects of both discrete-event and continuous simulation is provoked, resulting in a combined discrete-continuous simulation. In this paper, an architecture of combined modeling for supply chain simulation is proposed, which includes the equation of continuous portion in supply chain and how these equations are used in the supply chain simulation models. A simple example of supply chain model dealing with the strategic level of supply chain presented in this paper shows the possibility and the prospect of this approach.

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Combined Discrete-Continuous Modeling Methodology for Supply Chain Simulation (공급사슬 시뮬레이션을 위한 이산-연속 혼합 모델링 방법에 관한 연구)

  • 김서진;이영해;조민관
    • Journal of the Korea Society for Simulation
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    • v.10 no.2
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    • pp.75-89
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    • 2001
  • Many simulation models have been built to facilitate simulation technique in designing, evaluating, and optimizing supply chains. Simulation is preferred to deal with stochastic natures existing in the supply chain. Moreover simulation has a capability to find local optimum value within each component through entire supply chain. Most of supply chain simulation models have been developed on the basis of discrete-event simulation. Since supply chain systems are neither completely discrete nor continuous, the need of constructing a model with aspects of both discrete-event and continuous simulation is provoked, resulting in a combined discrete-continuous simulation. In this paper, an architecture of combined modeling for supply chain simulation is proposed, which includes the equation of continuous portion in supply chain and how these equations are used in the supply chain simulation models. A simple example of supply chain model dealing with the strategic level of supply chain presented in this paper shows the possibility and the prospect of this approach.

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Reverse-Simulation Method for Single Run Simulation Optimization (단일 실행 시뮬레이션 최적화를 위한 Reverse-Simulation 기법)

  • 이영해
    • Journal of the Korea Society for Simulation
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    • v.5 no.2
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    • pp.85-93
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    • 1996
  • Simulation is commonly used to find the best values of decision variables for problems which defy analytical solutions. This objective is similar to that of optimization problems and thus, mathematical programming techniques may be applied to simulation. However, the application of mathematical programming techniques, e.g., the gradient methods, to simulation is compounded by the random nature of simulation responses and by the complexity of the statistical issues involved. In this paper, therefore, we explain the Reverse-Simulation method to optimize a simulation model in a single simulation run. First, we point the problem of the previous Reverse-Simulation method. Secondly, we propose the new algorithm to solve the previous method and show the efficiency of the proposed algorithm.

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