• 제목/요약/키워드: computer-simulation

검색결과 12,240건 처리시간 0.039초

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

  • 홍석준;임덕선;김원태;조인휘
    • 전기전자학회논문지
    • /
    • 제23권4호
    • /
    • pp.1430-1439
    • /
    • 2019
  • FMI를 기반으로 하는 co-simulation의 마스터 알고리즘(MA)에서 시뮬레이션 결과의 정확도를 높이는 방법으로 zero crossing 포인트를 찾기 위한 Bisectional algorithm을 사용할 수 있다. 그러나 이 알고리즘은 많은 Rollback을 야기한다. 따라서 본 논문에서는 제안하는 MA는 Bisection algorithm을 통해 zero crossing 포인트를 검출하면서도 반복되는 구간 그래프를 분석하여 그 값을 Markov chain을 적용하여 다음 구간을 예측하여 이를 step size에 적용한다. 시뮬레이션에서 실제 Rollback이 발생했을 때 그래프 형태별로 변화되는 step size를 배열로 저장하고, 이룰 다음 예측 구간에 적용함으로서 Rollback을 최소화하는 알고리즘을 제안한다. 시뮬레이션 결과를 통해 제안하는 알고리즘이 기존 알고리즘에 비해 최대 20% 이상의 시뮬레이션 시간이 감소되는 것을 확인하였다.

System Level Simulation of CDMA Network with Adaptive Array

  • Chung, Yeong-Jee;Lee, Jae-Woo
    • 한국정보통신학회논문지
    • /
    • 제3권4호
    • /
    • pp.755-764
    • /
    • 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.

  • PDF

Integrated Simulation System of Aircraft

  • Wang, Xingren
    • 한국시뮬레이션학회:학술대회논문집
    • /
    • 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
    • /
    • pp.68-71
    • /
    • 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.

  • PDF

The AUV design based on component modeling and simulation

  • Kebriaee, Azadeh;Nasiri, Hamidreza
    • Ocean Systems Engineering
    • /
    • 제2권2호
    • /
    • pp.83-97
    • /
    • 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
    • 한국시뮬레이션학회:학술대회논문집
    • /
    • 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
    • /
    • pp.136-140
    • /
    • 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.

  • PDF

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

  • 이흥주;이준하
    • 반도체디스플레이기술학회지
    • /
    • 제4권1호
    • /
    • pp.23-27
    • /
    • 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.

  • PDF

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

  • 노창현;정광호
    • 한국게임학회 논문지
    • /
    • 제2권2호
    • /
    • pp.46-51
    • /
    • 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.

  • PDF

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

  • 김승곤;위경수;이창건;이경수
    • 제어로봇시스템학회논문지
    • /
    • 제21권3호
    • /
    • pp.187-193
    • /
    • 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.