• Title/Summary/Keyword: computer-simulation

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A Prediction Method using Markov chain for Step Size Control in FMI based Co-simulation (FMI기반 co-simulation에서 step size control을 위한 Markov chain을 사용한 예측 방법)

  • Hong, Seokjoon;Lim, Ducsun;Kim, Wontae;Joe, Inwhee
    • Journal of IKEEE
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    • v.23 no.4
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    • pp.1430-1439
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    • 2019
  • In Functional Mockup Interface(FMI)-based co-simulation, a bisectional algorithm can be used to find the zerocrossing point as a way to improve the accuracy of the simulation results. In this paper, the proposed master algorithm(MA) analyzes the repeated interval graph and predicts the next interval by applying the Markov Chain to the step size. In the simulation, we propose an algorithm to minimize the rollback by storing the step size that changes according to the graph type as an array and applying it to the next prediction interval when the rollback occurs in the simulation. Simulation results show that the proposed algorithm reduces the simulation time by more than 20% compared to the existing algorithm.

System Level Simulation of CDMA Network with Adaptive Array

  • Chung, Yeong-Jee;Lee, Jae-Woo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.4
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    • pp.755-764
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    • 1999
  • In this study, the system level network simulation is considered with adaptive array antenna in CDMA mobile communication system. A network simulation framework is implemented based on IS-95A/B system to consider dynamic handoff, system level network behavior, and deploying strategy into the overall CDMA mobile communication network under adaptive array algorithm. Its simulation model, such as vector channel model, adaptive beam forming antenna model, handoff model, and power control model, are described in detail with simulation block. In order to maximize SINR of received signal at antenna, maximin algorithm is particularly considered, and it is computed at each simulation snap shot with SINR based power control and handoff algorithm. Graphic user interface in this system level network simulator is also implemented to define the simulation environments and to represent simulation results on real mapping system. This paper also shows some features of simulation framework and simulation results.

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Integrated Simulation System of Aircraft

  • Wang, Xingren
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.10a
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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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The AUV design based on component modeling and simulation

  • Kebriaee, Azadeh;Nasiri, Hamidreza
    • Ocean Systems Engineering
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    • v.2 no.2
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    • pp.83-97
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    • 2012
  • In the present work, design procedure and computer simulation of an AUV are documented briefly. The design procedure containing the design of propulsion system and CFD simulation of hydrodynamics behavior of the hull leads to achieve an optimum mechanical performance of AUV system. After designing, a comprehensive one dimensional model including motor, propeller, and AUV hull behavior simulates the whole dynamics of AUV system. In this design, to select the optimum AUV hull, several noses and tails are examined by CFD tools and the brushless motor is selected based on the first order model of DC electrical motor. By calculating thrust and velocity in functional point, OpenProp as a tool to select the optimum propeller is applied and the characteristics of appropriate propeller are determined. Finally, a computer program is developed to simulate the interaction between different components of AUV. The simulation leads to determine the initial acceleration, final velocity, and angular velocity of electrical motor and propeller. Results show the final AUV performance point is in the maximum efficiency regions of DC electrical motor and propeller.

A Study of Performance Evaluation Modeling Method for The 3rd Generation Mobile Communication Network

  • Kim, Young-Joon;Jeong, Dong-Won;Baik, Doo-Kwon
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.10a
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    • pp.136-140
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    • 2001
  • The 3rd generation mobile telecommunication fields are being standardized and developed in two parts, 3GPP and 3GPP2. These two parts have established each Network Architecture Models to achieve the goals basically required in the 3rd generation and to make it progress to IP network in the future. To achieve these goals many system architectures are proposed. Not only functional aspects but also performance aspects are considered as major factors. This paper proposes a new method of performance evaluation modeling and simulation that improved the existing way. The method proposed in this paper is Aspect oriented logical performance analysis Modeling and Simulation method. This proposed method is expected to improve efficiency of performance analysis modeling and simulation on the 3rd generation mobile telecommunication system.

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Simulation Methodology for Diffusion Process in Poly-silicon (다결정 실리콘의 확산 공정 시뮬레이션)

  • Lee, Hoong-Joo;Lee, Jun-Ha
    • Journal of the Semiconductor & Display Technology
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    • v.4 no.1 s.10
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    • pp.23-27
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    • 2005
  • This paper presents a simulation methodology for the poly-silicon oriented TCAD(technology-CAD) system. A computer simulation environment for the poly-silicon processing has been set up with the proper adoption of the two-stream model for ion-doping, diffusion, and defects inside of grain and on the grain boundary. After the simulator calibration, simulation results for the poly-silicon diffusion hat shown a good agreement with the SIMS data.

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A Study on Real-time simulation using Artificial Neural Network (신경회로망을 이용한 실시간 시뮬레이션에 관한 연구 (원자력 발전소 중대사고를 중심으로))

  • Roh, Chang-Hyun;Jung, Kwang-Ho
    • Journal of Korea Game Society
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    • v.2 no.2
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    • pp.46-51
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    • 2002
  • In this study, a real-time simulation method for the phenomena, which are too complex to be simulated during real-time computer games, was proposed based on the neural network. The procedure of proposed method is to 1) obtain correlation data between input parameters and output parameters by mathematical modeling, code analyses, and so on, 2) train the neural network with the correlation data, 3) and insert the trained neural network in a game program as a simulation module. For the case that the number of the input and output parameters is too high to be analyzed, a method was proposed to omit parameters of little importance. The method was successfully applied to severe accidents of nuclear power plants, reflecting that the method was very effective in real time simulation of complex phenomena.

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An Efficient Simulation Technique to Verify Real-time Performance of Vehicle Control Systems (자동차 제어 시스템의 실시간 성능 검증을 위한 효율적인 실시간 시뮬레이션 기법)

  • Kim, Seunggon;We, Kyoung-Soo;Lee, Chang-Gun;Yi, Kyongsu
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.3
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    • pp.187-193
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    • 2015
  • When developing a vehicle control system, simulation methods are widely used to validate the whole system in the early development phase. With this regard, the simulator should correctly behave just like the real parts that are not yet implemented while interacting with already implemented parts in real-time. However, most simulators cannot provide functionally and temporally accurate behaviors of the target system. In order to overcome this limitation, this paper proposes a novel real-time simulation technique that can efficiently simulate the temporal behavior as well as the functional behavior of the simulation target system.