• Title/Summary/Keyword: simulation application

Search Result 5,608, Processing Time 0.032 seconds

Parallel VHDL Simulation on IBM SP2 and SGI Origin 2000 (IBM SP2와 SGI Origin 2000에서의 병렬 VHDL 시뮬레이션)

  • 정영식
    • Journal of the Korea Society for Simulation
    • /
    • v.7 no.1
    • /
    • pp.69-83
    • /
    • 1998
  • In this paper, we present the results of simulation by running parallel VHDL simulation on typical MPP(Massively Parallel Processor) systems such as IBM SP2 and SGI Origin 2000. Parallel simulation uses the synchronous protocol and parallel program is implemented using MPI(Message Passing Interface) based on message passing model, so that it can urn on any parallel programming environment which supports MPI, a standard communication library. And then GVT(Global Virtual Time) computation for parallel simulation is based on the global broadcasting with MPI_Bcast(), which is a standard function in MPI and piggybacking. Our benchmark exhibits that as size of VHDL grows, the parallel simulation has a better performance compared with the sequential simulation. In addition, we also show the results of comparison between IBM SP2 and SGI Origin 2000 by applying the same application to those indirectly.

  • PDF

A Unity-based Simulator for Tsunami Evacuation with DEVS Agent Model and Cellular Automata (DEVS 에이전트 모델과 셀 오토마타를 사용한 유니티엔진 기반의 지진해일 대피 시뮬레이터 개발)

  • Lee, Dong Hun;Kim, Dong Min;Joo, Jun Mo;Joo, Jae Woo;Choi, Seon Han
    • Journal of Korea Multimedia Society
    • /
    • v.23 no.6
    • /
    • pp.772-783
    • /
    • 2020
  • Tsunami is a frightful natural disaster that causes severe damages worldwide. To minimize the damage, South Korea has built a tsunami warning system and designated evacuation sites in the east and south coasts. However, such countermeasures have not been verified whether they are adequate to minimize casualties since tsunami rarely occurs in South Korea. Recently, due to increasing earthquakes in the west coast of Japan, the likelihood of South Korea entering the damage area of tsunami rises; thus, in this paper, we develops a simulator based on Unity game engine to simulate the evacuation from tsunami. In order to increase the fidelity of the simulation results, the simulator applies a tsunami simulation model that analyzes coastal inundation based on cellular automata. In addition, the objects included in tsunami evacuation, such as humans, are modeled as an agent model that determines the situation and acts itself, based on the discrete-event system specification (DEVS), a mathematical formalism for describing a discrete event system. The tsunami simulation model and agent models are integrated and visualized in the simulator using Unity game engine. As an example of the use of this simulator, we verify the existing tsunami evacuation site in Gwangalli Beach in Busan and suggest the optimal alternative site minimizing casualties.

Application of SDAHL-74 Watershed Model to a Long Term Runoff Analysis in the Mountainous Watershed (산지유역에 대한 USDAHL-74 유역수문모형의 장기유출 해석적용)

  • 권순국;고덕구
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.29 no.2
    • /
    • pp.53-63
    • /
    • 1987
  • Due to their wide range of application, deterministic comprehensive hydrologic models using digital computers have been developed in all countries of the world and researches are being undertaken for their appropriate applications. The aim of this study has been to demonstrate the practical implementation of a physically based distributed hydrologic model, the USDAHL-74 model and to investigate its ability to simulate the long term estimate of water balance quantities in a Korean mountainous watershed. Application of the model to Dochuk watershed indicates the following results. 1.Since the USDAHL-74 model includes all the major components of the hydrologic cycle in agricultural watersheds, thus is comprehnsive, the model seems to have a wide range of application from the fact that simulation results obtained are not only runoff volumes m various time units but their spatial variation as well as even soil moisture within the watershed. 2.An approximate calibration to determine the parameter values in the model using various data obtained from D0chuk shed shows that the simulation error of yearly runoff volume is only 0.6 % and a correlation coefficient between observed daily runoff volume and simulated one is 0.91 in all calibrated period.3.As a verification test of the model, runoff volumes are simulated using 1986 year data without changing the parameter values determined by 1985 year data. The tests show that the USDAHL-74 model is a flexible tool and that realistic production to simulate the long term estimate of runoff in Korean mountainous watershed could be obtained using only a short period of calibration.4. Despite of the encouraging results, there still remain minor problems concerning the practical application of the model to improve the result of simulations. Some of these are the small descrepancies between observed and simulated daily runoff volume appeared in the vicinity of peaks and the recession of1 the daily hydrographs and the model performance for the frozen ground and melting process in the model. 5. Alough the use of parameter with physical significance and the ability to improve calibrations on the basis of physical reasoning represents advantages in the simulation for ungaged watersheds, further researches are needed to use the USDAHL-74 mode to simulate runoff in ungaged watersheds.

  • PDF

A Study on the Application Strategies of Renewable Energy Systems Considering Layout and Block Plan in Apartment Building (공동주택의 배치 및 블록별 재생에너지 시스템의 적용성에 관한 연구)

  • Lee, Kwan-Ho
    • Journal of the Korean Solar Energy Society
    • /
    • v.26 no.3
    • /
    • pp.79-87
    • /
    • 2006
  • This study aims to presents the applicability of apartment building for renewable energy systems using method of uncomplicated calculation and computer simulation. According to the weather conditions (NASA Surface meteorology and Solar Energy) analysis, it has been found that photovoltaic and wind power system can be applied to apartment buildings application. In case study considering layout and block plan, adaptation of solar water heating, photovoltaic and wind energy system to apartment buildings was proved to produce a profit. And the application strategies of renewable energy systems can be used not only for the investment decisions for economic analysis but also for the comparative analysis of uncomplicated calculation and computer simulation.

A Study on the STATCOM Application for Efficient Operations of Wind Farm (풍력발전단지의 효율적인 운전을 위한 STATCOM 적용 가능성 연구)

  • 장성일;최정환;박인기;황혜미;최돈만;김광호;유능수
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.52 no.5
    • /
    • pp.250-256
    • /
    • 2003
  • In this papur, the STATCOM (STATic synchronous COMpensator) application for efficient operations of wind farm is described. The wind farm connected with the electric power network is one of good alternative energy sources. However, it would be also highly possible that interconnection of wind farm causes unwanted influences on distribution system operation, protection and control. This paper proposes the STATCOM application for reducing the negative effects from interconnection of wind farm with distribution networks. The simulation results show that STATCOM would be on effective and useful device to resolve the bad influences from wind farm on distribution networks and improve the operational efficiency of wind farm. In the simulation, the radial distribution network of IEEE 13 bus was modeled using PSCAD/EMTDC.

Application of Thermal Discharge Dispersion Model on Cheonsu Bay (천수만 해역에서 온배수 확산모델의 적용)

  • 박영기
    • Journal of Environmental Science International
    • /
    • v.4 no.2
    • /
    • pp.169-180
    • /
    • 1995
  • This Daper presents effective simulation of the dispersion of thermal discharge which can be relesed at Boryong power plant. Applied numerical models are finite difference method for hydrodynamic analysis and Masch-model comprised of conditions for ambient current velocity. Application of these models is done in Cheonsu Bay Summing up the results of this study are as follows; 1. It is found that the result for measurements of temperature appears high at southwardly Songdo on flood. The reason is that tidal currents which flowed north direction were accompanied with southwardly dispersed thermal discharge. A minute Particle of thermal Plume has a tendency to dispels inward Deacheon Bay. 2. According to the results of numerical experiment, maximum distance for thermal discharge dispersion appeared 10.8 km at lower part and 8.6 km at upper part with power plant outlet as starting point. 3. Comparative the numerical simulation and Airbone Multispectral Scanner indicated that thermal discharge should be verified separative phenomena. The simulated results were compared with field data set showing good agreement. It is concluded that these model can be simulated well.

  • PDF

An Analysis of Location Management Cost by Predictive Location Update Policy in Mobile Cellular Networks (이동통신망에서 예측 위치 등록 정책을 통한 위치관리 비용 감소 효과 분석)

  • Ko, Han-Seong;Hong, Jung-Sik;Chang, In-Kap;Lie, Chang-Hoon
    • Journal of Korean Institute of Industrial Engineers
    • /
    • v.34 no.2
    • /
    • pp.160-171
    • /
    • 2008
  • MU's mobility patterns can be found from a movement history data. The prediction accuracy and model complexity depend on the degree of application of history data. The more data we use, the more accurate the prediction is. As a result, the location management cost is reduced, but complexity of the model increases. In this paper, we classify MU's mobility patterns into four types. For each type, we find the respective optimal number of application of history data, and predictive location area by using the simulation. The optimal numbers of four types are shown to be different. When we use more than three application of history data, the simulation time and data storage are shown to increase very steeply.

An Analysis of Location Management Cost by Predictive Location Update Policy in Mobile Cellular Networks (이동통신망에서 예측 위치 등록 정책을 통한 위치관리 비용 감소 효과 분석)

  • Go, Han-Seong;Jang, In-Gap;Hong, Jeong-Sik;Lee, Chang-Hun
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2007.11a
    • /
    • pp.388-394
    • /
    • 2007
  • In wireless network, we propose a predictive location update scheme which considers mobile user's(MU's) mobility patterns. MU's mobility patterns can be found from a movement history data. The prediction accuracy and model complexity depend on the degree of application of history data. The more data we use, the more accurate the prediction is. As a result, the location management cost is reduced, but complexity of the model increases. In this paper, we classify MU's mobility patterns into four types. For each type, we find the respective optimal number of application of history data, and predictive location area by using the simulation. The optimal numbers of four types are shown to be different. When we use more than three application of history data, the simulation time and data storage are shown to increase very steeply.

  • PDF

Application of AGNPS Water Quality Computer Simulation Model to a Cattle Grazing Pasture

  • Jeon, Woo-Jeong;Parajuli, P.;Yoo, K.-H.
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.45 no.7
    • /
    • pp.83-93
    • /
    • 2003
  • This research compared the observed and model predicted results that include; runoff, sediment yield, and nutrient losses from a 2.71 ha cattle grazing pasture field in North Alabama. Application of water quality computer simulation models can inexpensively and quickly assess the impact of pasture management practices on water quality. AGNPS single storm based model was applied to the three pasture species; Bermudagrass, fescue, and Ryegrass. While comparing model predicted results with observed data, it showed that model can reasonably predict the runoff, sediment yield and nutrient losses from the watershed. Over-prediction and under-prediction by the model occurred during very high and low rainfall events, respectively. The study concluded that AGNPS model can be reasonably applied to assess the impacts of pasture management practices and chicken litter application on water quality.

Improvement of Heating Pattern in RF Hyperthermia -Simultaneous Application of Dielectric Heating and Induction Heating-

  • Sakakibara, Norifumi;Ochiai, Makoto;Hayakawa, Yoshinori
    • Proceedings of the Korean Society of Medical Physics Conference
    • /
    • 2002.09a
    • /
    • pp.478-480
    • /
    • 2002
  • Heating by RF wave is divided into dielectric heating and induction heating. Dielectric heating and induction heating from outside the body have the compensatory heating pattern. While surface fat layer is heated by dielectric heating, it is not heated by induction heating. While the peripheral part at the middle of the electrodes is not heated by dielectric heating, it is heated by induction heating. By the simultaneous application both modalities, heating pattern seems to be more uniform and improved. Computer simulation of Finite Element Method (FEM) using ANSYS was conducted to dielectric heating with the results of above-mentioned feature. Theoretical considerations by the uniform RF magnetic field in a cylinder and textbooks support the feature of the above-mentioned heating pattern of induction heating. Further computer simulation of FEM using ANSYS will be conducted to simultaneous application of dielectric heating and induction heating to verify and will be reported.

  • PDF