• Title/Summary/Keyword: Computer simulation experiment

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Analysis on Simulation and Experiment for Fault Current Limiting Characteristics of SFCL using Magnetic Coupling of Two Coils with Series Connection (직렬연결된 두 코일의 자기결합을 이용한 초전도 전류제한기의 사고전류제한 특성 시뮬레이션 및 실험 분석)

  • Kim, Jae-Chul;Lim, Sung-Hun;Kim, Jin-Seok;An, Jae-Min;Moon, Jong-Fil
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.8
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    • pp.26-30
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    • 2008
  • The simulation and experiment for the fault current limiting characteristics of the superconducting fault current limiter (SFCL) using the magnetic coupling of series connected two coils were performed. The magnetic fluxes generated from two coils were canceled out during a normal time. However, the resistance generation of high-Tc superconducting (HTSC) element after a fault occurrence allows the magnetic fluxes of two coils and contributes to the fault current limiting operation. Through the computer simulation and the current limiting experiment for this SFCL, the operational current and the limiting impedance of the SFCL could be confirmed to be improved by adjusting the inductance ratio of two coils.

Simulation of Fire Evacuation Induction System Using Smartphone Navigation Application

  • Shin, Dongmin;Jeon, Seongman;Lee, SungPil;Cho, Byungjun
    • Journal of the Korea Society of Computer and Information
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    • v.25 no.12
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    • pp.243-251
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    • 2020
  • This study is intended to verify the efficiency of the information system by using the navigation application in case of fire. In the demonstration scenario simulation, it was assumed that a fire occurred 6th floor in Korea Institute of Industrial Design Promotion located in C city, K province. Eighty juniors students from K University's department of paramedics of science participated. As a result of the experiment, the demonstration simulation using the navigation application showed that the evacuation time was faster than the case of evacuation guidance in a fire situation. The need for a fire prevention system and fire prevention awareness before and after the implementation of the demonstration scenario simulation increased the need for a fire prevention system and fire prevention awareness score after the experiment.

Asymptotic Comparison of Latin Hypercube Sampling and Its Stratified Version

  • Lee, Jooho
    • Journal of the Korean Statistical Society
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    • v.28 no.2
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    • pp.135-150
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    • 1999
  • Latin hypercube sampling(LHS) introduced by McKay et al. (1979) is a widely used method for Monte Carlo integration. Stratified Latin hypercube sampling(SLHS) proposed by Choi and Lee(1993) improves LHS by combining it with stratified sampling. In this article it is shown that SLHS yields an asymptotically more accurate than both stratified sampling and LHS.

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Active Structural Vibration Control using Forecasting Control Method (예측 제어기법을 이용한 기계 구주물의 능동 진동제어)

  • 황요하
    • Journal of KSNVE
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    • v.2 no.4
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    • pp.293-304
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    • 1992
  • Active vibration control is presented with simulation and experiment. Dynamic Data System(DDS) method is used for system modeling and this model is combined with an forecasting control technique to derive a control equation. In the experiment, on-line digital computer monitors structural vibration and calculates control input. The control input is sent to an electromagnetic actuator which cancels the structural vibration. Experiment is performed first with a simple beam setup to demonstrate the effetiveness of this method. This method is then applied to a color laser printer to actively modify the structure. The beam experiment showed vibration reduction of over 60% with one-and two-DOF models. In the printer structure experiment, the first mode of 308 Hz was successfully controlled with a one-DOF model.

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A study of the determination of off-set position for Nd:YAC laser welding between SCP steel sheet and STS304 sheet (Nd:YAG 레이저빔을 이용한 SCP 강판과 STS304강판 용접시 오프셋(off-set) 위치 결정에 관한 연구)

  • Yoon B. S.;Kim T. H.;Park G. Y.;Lee G. D.
    • Laser Solutions
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    • v.7 no.2
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    • pp.1-10
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    • 2004
  • This work was attempted to join SCP sheet and STS304 sheet by using Nd:YAC laser beam. SCP sheet has good formability and low cost, while STS304 has excellent corrosion resistance and mechanical properties in high temp. In this experiment, butt joint type was used to develop the tailored blank welding for dissimilar steel. Sheets which have different thermal properties. Computer simulation was conducted to obtain the off-set position for efficient welding by considering laser power, scanning speed, focal length and basic properties. The result showed that the optimum thermal distribution was obtained when the laser beam was irradiated at $0.05{\sim}0.1$ mm off-set toward the SCP sheet side. The experiment was conducted based on the result of computer simulation to show the same optimum conditions. Optimum conditions were 3KW in laser beam power, 6m/min in scanning speed, -0.5mm in focal position, 0.1mm off-set toward SCP. Microhardness test, tensile test, bulge test, optical microscopy, EDS, and XRD were performed to observe the microstructure around fusion zone and to evaluate the mechanical properties of optimum conditions, The weld zone had high microhardness values by the formation of the martensitic structure. Tensile test measured the strength of welded region by vertical to strain direction and the elongation of welded region by parallel to strain direction. Bulge test showed $52\%$ formability of the original materials. Bead shape, grain size, and martensitic structure were observed by the optical microscopy in the weld zone. Detailed results of EDS, XRD confirmed that the welded region was connected of martensitic structure.

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The Study on the Visual illusions and the Image of the Clothing by the Computer Simulation through the combination of the collars and the sleeves (Computer Simulation을 이용한 의복의 착시효과와 이미지 연구 Collar와 Sleeve의 조합을 중심으로-)

  • Choi, Jung;Lee, Kyoung-Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.20 no.5
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    • pp.915-929
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    • 1996
  • The purpose of this study is to investigate the visual illusions and image of the combinated collars and sleeves which are combinated by the computer simulation. The detail object of this study as follows; 1) to know the visual illusions of the clothing as the collar and sleeves are combinated 2) to constract the clothing image using sementic differential scales 3) to know the differet image of the clothing as the collars and sleeves are combinted 4) to know the interaction effect of the collars and sleeves of the clothing The detail method of this study is as follows; In the first experiment, there are two groups; the first 8 groups are the combination of the same collar and the different sleeves. The second 8 groups are the combination of the same sleeve and the different collars. The second experiment has done for the 32 clothings which are the combination of the 8 collars and 4 sleeves. For the 14 clothing the image has tested by 13 semantic differential bi- polar scale. The subjects were 50 female students majoring in clothing and textile. The data analyzed by Kendall cofficient of concodance, Factor analysis, Anova and scheffe's test. Briefly the image of the clothing is much influenced by the varing of the collar than that of the sleeve. Thus, we also can conclude that the recognition of the clothing are much more dependent on the collar than sleeve.

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A study for improving passenger service level at the airport security checks by using simulation (시뮬레이션을 이용한 공항 보안검색 시스템 개선으로 이용객 서비스 수준제고 방안 연구)

  • Choi, Sanggyun;Lee, Chulung
    • Journal of the Korea Society of Computer and Information
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    • v.18 no.3
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    • pp.59-68
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    • 2013
  • In this study, airport security check process is analyzed to modeling a simulation. Simulation is compared with real security system to verify. Utilizing verified simulation, spends time in the current security check is calculated and suggests alternatives. Considering the movement of passengers and security check system of all four cases the results yielded by the experiment. The results show that security check time decreased significantly to 20.8%. The simulation was developed in this study; including the introduction of a new security system at security check can be used as a decision support tool is expected.

Measurement System Establishment and Result Comparison for Verification of Train Performance Simulation (열차주행시뮬레이션 검증을 위한 계측시스템 구축과 결과 비교)

  • Lee, Tae-Hyung;Park, Choon-Soo;Mok, Jin-Yong
    • Proceedings of the KIEE Conference
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    • 2003.11b
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    • pp.95-98
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    • 2003
  • Computer aided simulation is becoming an essential part in planning, design, and operation of railway systems. To determine the adequate performance and specification of railway system, it is necessary to calculate rolling stock's performance such as distance, speed, power etc when train's running. This paper presents result of train performance simulation using the program that developed in advance for Korea high speed train. To verify result of simulation, we have developed measurement system and compared simulation result with experiment data.

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Analysis of the Magnetic Field Distribution and the Current Characteristics of Rotating Type Low Tc Superconducting Power Supply (회전자속형 초전도 전원장치의 박막상에서의 2차원 자장분포 및 전류 특성 해석)

  • Sim, Ki-Deok;Kim, Ho-Min;Yoon, Yong-Soo;Chu, Yong;Han, Tae-Su;Ko, Tae-Kuk
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.343-345
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    • 1998
  • By computer simulation, the pattern of magnetic field distribution on the Nb-foil of a rotating flux type superconducting power supply has been calculated. Using the results, the current pumping rate has been calculated and compared with the results obtained by the experiment. The experiment has been executed with small-size flux-rump in the environment of LN2 and LHe in order to compare the pattern of magnetic filed in the superconducting state and in the normal state. Five hall-sensor was located on the center, right side, left-side, upper side, lower side of the Nb-foil in order to obtain more accurate pattern of the magnetic field generated by rotating pole. In the simulation, the effects of the excitation-magnet and the iron core located at the inner-side and circumference of the magnet have been considered. By comparing the data from the experiment and the results from the simulation, the size of normal spot estimated. At the same time, by calculating the linkage flux, the current-pumping-rate has been obtained. Consequently, the results obtained from experiment and simulation coincided as expected.

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A Study on Improvement Effect of voice information transmission using Auralization at the hydraulic turbine dynamo room in Dam (가청화를 이용한 댐 수차 발전기실의 음성정보전달 개선효과에 관한 연구)

  • Kook, Joung-Hun;Ju, Duck-Hoon;Jung, Eun-Jung;Kim, Jae-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.263-267
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    • 2007
  • Even though Waterpower Generation as pollution-free has its own merit of contribution by supply of good quality electricity, due to the noise made at the time of its operation, a normal mutual communication among the workers and technicians engaging at the hydraulic turbine dynamo room is almost impossible, and since those finishing materials had been used mainly by reflection material, it is actual situation that when working for maintenance in the hydraulic turbine dynamo room, as counterpart's voice vibrates, its working efficiency is difficult to ensure. On such view point, this Research has conducted Psycho-acoustics Experiment about voice Definition using Auralizational Technique, on the object for the hydraulic turbine dynamo room that improved its acoustic performance by computer simulation. As the result of Study, it was known that the clearness of sound with regard to voice information transmission was apparently improved in all items than before improvement. Therefore, it is considering that these results would be utilized usefully when renovation on the hydraulic turbine dynamo room in the future.

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