• 한국시뮬레이션학회논문지
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• 제8권2호
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• pp.57-72
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• 1999

With the rapidly increasing complexity of decision-marking or system development in the fields of industry, management, etc., modelling techniques using simulation has become more highlighted. Particularly, the advent of parallel computer systems not only has opened a new horizon of parallel simulation, but also has greatly contributed to the speed-up of the execution of simulation. The implementation of parallel simulation, however, is not a easy job for those who accustomed to the existing computer systems. And it is also necessarily confronted with the problem of synchronization conflict in the process. Thus, how to allow a wider community of users to gain access to parallel simulation while solving synchronization conflicts has become an important issue in simulation study. As a method to solve these problems, this paper is primarily concerned with the implementation of GPSS which is a generally used simulation language for discrete event simulation, onto a parallel computer using C-LINDA. For that, this paper, is to suggest a model and algorithm and to experiment it using a case.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1661-1664
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• 1994

In designing $SF_6$ puffer circuit breakers, analyzing are behavior during current zero region and thermal recovery characteristics after current interrupt ion is very important. In this paper, a mathematical are model based on the integral method has been based to analyze them. The pressure rise in the puffer chamber and the distributions of pressure, density, velocity and enthalpy inside nozzle are calculated and analyzed at current zero region. The influence of fault current magnitude and change of di/dt at current zero on the interruption capability of puffer circuit breakers is investigated. Finally, the calculated results are compared with the available results from experiment.

• 대한전자공학회논문지
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• 제27권7호
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• pp.1049-1058
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• 1990

Mathematical modeling equations of a parallel plate type reactor were obtained in the PECVD process in preparing hydrogenated amorphous silicon. Velocity profiles, temperature profiles and concentration profiles in the reactor were calculated from the model. The theoretical approach was attempted to obtain the deposition rate and film uniformity at different operating conditions by calculating RF discharge parameters and establishing the reaction mechanisms of a-Si:H thin film. The modelling equations are solved by a finite difference method with control volume balance. The mean electrom energy in discharge was applied to model simulation parameter. The magnitudes of the predicted deposition rate are in good aggrement with those of experiment. The results of computer simulation shows that uniform deposition profiles can.

• 한국지반환경공학회 논문집
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• 제9권3호
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• pp.5-9
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• 2008

하수관거는 지중에 매설되기 때문에 균열발생 시 오염원이 빠르게 지하로 침투되어 오염을 야기한다. 본 연구에서는 하수관거 균열발생 시의 오염원의 확산에 대한 수치모델링을 수행하였다. 모델링 수행 결과를 이용하여 오염원의 이동경로를 예측해보았으며, 다음과 같은 결론을 얻었다. 오염원의 이동방향은 지표면의 지형경사에 따른 흐름과 비슷한 경향을 보이는 것으로 나타났으며, 지하방향으로는 약 8~10m 깊이까지 침투되는 것으로 나타났다. 본 연구를 통하여 장래 하수관거 관리에 효율성을 제공할 것으로 기대된다.

• 유공압시스템학회:학술대회논문집
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• 유공압시스템학회 2010년도 춘계학술대회
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• pp.75-80
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• 2010

The paper is that study method to reduce bad influence that act to the floating fish cage by effect of environment in sea. Fish cage is controlled buoyancy using air control. According to marine environment, it is descend automatically to set-up depth and rise on the surface of the sea. The paper is the preceding research for a practical application. The fish cage simplified with the spherical float body. Then a control algorithm and a program developed by the experiment. And we did modelling by bond graph technique, and controlled by the practical reference model for PID control.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.134-136
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• 1998

When a MCCB Instant trip spring which is adjusted to notrip at -20% of each current from $5{\times}In$ to $10{\times}In$ and trip +20% of those is designed, we should know attraction force between Fixed Magnet and Armature. So we first made some samples, do experiments of weight, and simulated the modelling by 3D Maxwell S/W. With values of experiment and simulated values, we do design instant trip springs and repeat the above process. Finally we set up the Process of designing Instant spring. With it, we can save time and R&D cost.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.354-356
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• 1999

Through the Standard of MCCB, the Adjustable Type Instant Trip Unit should NO trip at -20% of each current from $5{\times}In$ to $10{\times}In$ and trip +20% of those. In this paper, we obtain the attraction force between Fixing Magnet and Moving Armature. So we first made some samples. do experiments of weight, and simulated the modelling by 3D Maxwell S/W. With values of experiment and simulated values, we do design instant trip springs by using the ADAMS S/W of kinematic simulation. Finally we product the 250A Adjustable Instant Trip Unit, and it is very useful to our customers.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.54-60
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• 2010

액체로켓엔진 시스템의 시동 및 정지 또는 추력 제어와 같은 천이 작동시 동특성을 예측하기 위한 선행 연구로서 추진제 공급 시스템의 구성품에 대한 동특성 모델링을 수행하였다. 연료 공급계통과 산화제 공급 계통의 구성품들은 재생냉각채널을 제외하고 같은 것으로 가정하였다. 동특성 모델링의 대상 구성품은 펌프, 관로, 오리피스, 제어 벨브, 재생냉각채널, 인젝터 등이며 실제 엔진 시스템의 축소모형에 대한 수력시험을 통해 각 구성품의 동특성 모델링을 검증하였다.

• 센서학회지
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• 제14권2호
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• pp.109-115
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• 2005

Calibration is a prerequisite procedure for employing a camera as a 3D sensor in an automated machines like robots. As accurate sensing is possible only when the vision sensor is calibrated accurately, many different approaches and models have been proposed for increasing calibration accuracy. Particularly an important factor which greatly affects the calibration accuracy is the nonlinearity in the mapping between 3D world and corresponding 2D image. In this paper GMDH algorithm is used to learn the nonlinearity without physical modelling. The technique proposed can be effective in various situations where the levels of noises and characteristics of nonlinear distortion are different. In simulations and an experiment, the proposed technique showed good and reliable results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.190-191
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• 2007

This paper proposes a novel simulation method of grid connected 3MW wind power generation system using RTDS(Real Time Digital Simulator). RTDS can perform the simulation as well as the experiment in real time. Also for the purpose of accurate simulation, real wind velocity is measured by anemometer. So measured wind velocity is applied to the simulation. And 3MW wind power generation system circuit is made by RSCAD.