• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 전력전자학술대회 논문집
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• pp.359-360
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• 2014

본 논문은 Y-capacitor와 미분기를 이용한 절연형 AC/DC컨버터의 제어신호 전송기법을 제안한다. 기존 SSR(Secondary Side Regulation)의 제어단(Photo-coupler, TL431 및 부가회로)은 바이어스 전류에 의한 대기전력 손실이 크다. 하지만 제안된 방식은 기존 SSR의 제어단을 제거하고, 2차 측 제어신호를 EMI노이즈 경로로 사용되는 Y-capacitor와 저항, 커패시터만을 이용하여 1차 측으로 전송한다. 제안 신호전송기법의 이론적 해석과 PSIM Tool을 이용한 Simulation 결과를 통하여 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 전력전자학술대회 논문집
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• pp.313-314
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• 2012

In this paper presents study of T-Type multi level inverter for utility interactive photo voltaic inverter. In order to increase efficiency and performance of utility interactive photo voltaic (UIPV) system, we propose multi level PCS topology, such as T-type inverter. The control algorithm for utility interactive inverter is implemented by simulation and experimentation, which includes dc-bus and midpoint voltage controller, ac-grid current controller and PLL algorithm.

• 전기학회논문지
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• 제58권11호
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• pp.2175-2184
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• 2009

This paper describes operational analysis results of the DC micro-grid using detailed model of distributed generation. Detailed model of wind power generation, photo-voltaic generation, fuel-cell generation was implemented with the user-defined model of PSCAD/EMTDC software that is coded with C-language. The operation analysis was carried out using PSCAD/EMTDC software, in which the power circuit is implemented by built-in model and the controller is modelled by user-defined model that is also coded with C-language. Various simulation results confirm that the DC micro-grid can operate without any problem in both the interconnected mode and the islanded mode. The operation analysis result confirms that the DC micro-grid make it feasible to provide power to the load stably. And it can be utilize to develop the actual system design and building.

• 조명전기설비학회논문지
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• 제17권4호
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• pp.1-7
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• 2003

본 연구의 목적은 야간경관조명의 다양한 조명기법을 대상으로 컴퓨터 시뮬레이션을 통한 이미지 예측실험을 통해 조명기법별 평가특성을 분석하기 위한 기초연구로서 현장실험을 기준으로 물리량 및 주관 평가의 유효성을 검증하는데 있다. 연구는 우선 예비실험을 통해 선정된 평가어휘를 바탕으로 현장실험의 실험조건별 사진촬영과 물리량 측정 및 주관평가를 수행하여 조명 해석 프로그램에서 계산된 물리량과, 현장 실험에서 측정된 물리량을 비교하였으며 각각의 주관평가 결과를 가지고 현장과 CG, 현장과 사진에 대한 유효성을 검증하였다. 연구결과 1) 물리량의 유효성 검증결과 유의차가 5% 내외로 유의차가 없었으며 2) 현장실험과 CG, 현장실험과 사진실험의 주관평가 유효성 검증 결과 일부 항목을 제외한 대부분의 항목에서 유의차가 없는 것으로 나타났다.

• 전기전자학회논문지
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• 제26권3호
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• pp.373-379
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• 2022

LTV(Light to Voltage) 변환을 위한 APD(Avalanche Photo Diode)는 다른 PD(Photo Diode)와 다르게 높은전압의 동작영역을 사용하므로 TIA(Transimpedance Amplifier) 사용시 과전류 방지를 위해 Quenching 저항을 직렬로 연결하여야 한다. 그러한 경우 Quenching 저항이 TIA 전달함수에 영향을 미쳐 안정도에 심각한 결과를 초래할 수 있다. 본 논문에서는 APD Quenching 저항이 TIA의 전압과 전류 루프 전달함수에 미치는 영향을 분석하여 안정도 개선을 위한 Quenching 저항 값 결정 방법을 제안하고자 한다. 제안된 방법에 의하여 Quenching 저항을 가지는 TIA 회로를 설계하여 시뮬레이션 및 칩 제작을 통하여 동작의 안정도를 검증하였다.

• Journal of Power Electronics
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• 제12권1호
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• pp.19-23
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• 2012

This paper presents a practical methodology for realistic simulation on reverse characteristics of Wide Bandgap (WBG) SiC and GaN p-n junctions. The adjustment on certain physic-based model parameters, such as the trap density and photo-generation for SiC junction, and impact ionization coefficients and critical field for GaN junction are described. The adjusted parameters were used in Synopsys Medici simulation to obtain a realistic p-n junction avalanche breakdown voltage. The simulation results were verified through benchmarking against independent data reported by others.

• Nuclear Engineering and Technology
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• 제54권11호
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• pp.4231-4235
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• 2022

Considering the importance of deuterium in nuclear science including medical and industrial researches such as (BNCT) and nuclear reactors respectively, it is important to study various possible ways in addition to common methods for measuring its concentration. This study is an effort to measure deuterium concentration using PGNAA. The main idea is to calculate the area under 2.23 MeV gamma-rays photo peak resulting from neutron collision with Hydrogen atoms which are in mix with deuterium in samples. The study carried out by both simulation and experiment. Monte Carlo MCNPX2.6 code has been used for simulation and based on its acceptable results an experimental setup has been arranged. The coordination of results was in the range of R = 0.99 and R = 0.98 in simulation and experiment respectively. The accuracy of the study has been investigated by measuring the concentration of an unknown sample by both PGNAA and Fourier transform infrared spectroscopy (FT-IR) methods in which there were acceptable correlation between these two methods.

• 한국전기전자재료학회논문지
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• 제28권5호
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• pp.306-313
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• 2015

In this study, the change of optical characteristics was studied according to the micro optical pattern provided by photo lithography followed by thermal reflow process. The shape and luminance variation with micro pattern was evaluated by SEM and spectrometers. Also, we analyzed the luminance characteristics using the 3D-optical simulation (Optis works) program. As a result, we found that the radius of curvature(R) in micro pattern is decreased up to 77%($150^{\circ}C$) compared to the radius of curvature at the condition $100^{\circ}C$, which is caused by efficient reflow of organic material without chemical changes. The highest enhancement of brightness with optimum micro pattern was obtained at the condition of $120^{\circ}C$ reflow process. The brightness gain with optical micro patterns is more than 15% at the condition of R=16.95 um, ${\Theta}=77.14^{\circ}$ compared to original optical source. The results of light simulation with various radius of curvature and side angle of pattern shows the similar result of experiment evaluation of light behavior on optical micro patterns. It is regarded that the more effect on light enhancement was contributed by side angle which is effective factor on light reflection, rather than the curvature of micro-patterns.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.342-347
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• 2002

After the industrial revolution in 20 century, the world are preparing for new revolution that is society with knowledge for a basis such as IT(Information Technology), NT(Nano Technology) and BT(Bio Technology). Recently, NT is applied to various fields that are composed of science, industry, media and semiconductor-micro technology. It has need of IT that is ultra-precision positioning technology with strokes of many hundreds mm and maintenance of nm precision in fields of ultra micro process, ultra precision measurement, photo communication part and photo magnetic memory. Performance test of servo control system that is used ultra-precision positioning system with single plane X-Y stage is performed by simulation with Matlab. Analyzed for previous control algorithm and adapted for modern control theory, dual servo algorithm is developed by minimum order observer, and stability and priority on controller are secured. Through the simulation and experiments on ultra precision positioning, stability and priority on ultra-precision positioning system with single plane X-Y stage and control algorithm are secured by using Matlab with Simulink and ControlDesk made in dSPACE

• 전기학회논문지
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• 제62권7호
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• pp.969-973
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• 2013

To simulate the effect of high dose-rate radiation on semiconductor devices, device modeling work has been performed especially in the area of photo-current generation by a PIN diode. The resultant analytical values were compared with experimental ones that were specially designed and performed to benchmark the simulation results. Initial results showed 27.85% error between the simulation and the experiment. The error can be further reduced by improvement both in simulation and in related experiments. The developed technique from the study can be applicable to radiation dosimetry and to analysis on the radiation effects in electronics.