• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.10 no.3
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• pp.43-46
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• 1996

This paper shows a reasonable design standard of lighting system in underground streets, that was made by the systematic and statistical way considering actual conditions, such as investigated lighting transformer capacity, electric power consumption for lighting, load characteristics, etc for 5 underground streets.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.4
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• pp.46-53
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• 2008

In this study, we developed RBFN(Radial Basis Function Networks) based load modeling method with harmonic components. The developed method considers harmonic information as well as fundamental frequency and voltage considered as essential factors in conventional method. Thus, the reposed method makes it possible to effectively estimate load characteristics in power lines with harmonics. RBFN has some advantage such as simple structure and rapid computation ability compared with multi-layer perceptorn which is extensively applied for load modeling. To verify the effectiveness, the proposed method has been intensively tested with various dataset acquired under the different frequency and voltage and compared it with conventional methods such as polynomial method, MLPN and RBFN with no harmonic components.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.3
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• pp.20-27
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• 2006

Power line for digital home appliances has own property that transmitting power connected to loads. Especially, power line communication(PLC) for the home network which has characteristics of load fluctuation makes variable noise characteristics. It becomes serious problems to maintain efficient communication performance. Thus, in this paper, we present an optimal modulation and demodulation method through mathematical analysis of each measured load fluctuation based on PLC for home appliances. To analyze and compare various modem methods presented in this paper, we analyzed them normally via computer simulation under various noise channel environments according to various load fluctuations. In addition, we certified its availability through hardware implementation.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.1043-1048
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• 2006

This paper aimed to verify and develop lighting design data for offices in Korea. It focused on a Korean standard office value relative to lighting density and the evaluation of lighting energy and cooling load. When planning indoor lighting design, we generally utilize the lighting density value which is set $14W/m^2$ by the ASHRAE/IES standard office value. However, the value is not appropriate to apply in Korea where higher efficiency lamps are more popular than others. For calculation of a proper lighting density of Korea, we analysed distribution curves of luminous intensity(2-lamp fluorescent lighting fixture with Parabolic) and derived the new lighting density $12.64W/m^2$ as Korea standard office value. In the simulation using this value, it was shown that lighting energy and cooling load could be reduced.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.3
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• pp.69-74
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• 2007

Flux level is low in the maximum efficiency control of a stator flux-oriented control of induction motor under the light load. In this cast if the loaf torque is suddenly increased, torque component current is limited to the low level by torque-limit condition because of the low flux level. In this paper, a technique to solve the problem is proposed.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.12 no.1
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• pp.69-77
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• 1998

The uninterruptible power supply (UPS) has become an integral part of modern computer and communication system to assure a continued and stable operation by providing an uninterruptible power to vital equipments. Various control methods have come to the fore in recent times with the advent of high frequency switching technologies. This paper describes the DSP control method for three phase UPS inverter which guarantees the sinusoidal output voltage under nonlinear load conditions. The proposed control scheme is verified by simulation and experiment.riment.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.1 no.2
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• pp.82-87
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• 1987

본 연구에서는 GTO Thyristor로 구성하고 개선한 대용량 전류형GTO Inveter를 설계하였다. 부하로서는 유도전류기를 사용하였으며, 그 동작 특성을 비교 검토한 결과 전류콘덴서를 사용하지 않으므로 전류시 Chopper 회로에 과도현상을 줄였으므로 회로에 안정성이 향상됨을 나타내었다.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.653-656
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• 2009

본 논문에서는 태양전지-LED 시스템을 설계하여 부하 발전 배터리 용량을 산정하고, 상용 예비전력을 도입한 독립형 태양광발전시스템을 구현하였다. 또한, LED 조명부하에 대한 휘도 시뮬레이션 및 균일성 검사를 거친 후, 이를 태양광발전시스템과 함께 설치하였다. 태양전지-LED 시스템에 대하여 설계, 설치 및 운영에 관한 현장 시험을 통해 시스템의 신뢰성과 성능 및 제반 문제점을 확인하고, 태양광 에너지를 이용한 LED 표식장치의 다양한 응용을 위한 기초적 근거를 마련하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1995.10a
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• pp.75-79
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• 1995

전기재해(전기재해)라 함은 전력 계통의 이상이나 또는 전기 설비의 누전과 합선 및 과부하나 스파크 등에 의해서 전기 화재를 유발시키거나 전기기기에 이상을 주는 것을 말한다. 그러나 전기재해의 징후를 검출할 수 있다면 최근 들어 계속 늘어만 가는 전기재해의 피해를 줄일 수 있다. 본 논문에서는 전기재해 징후로서의 스파크 현상 검출과 이와 유사한 현상을 보이는 정상 부하의 동작 현상을 비교하고 구분하는 법을 제시하고 있다. 이를 바탕으로 스파크를 수반하는 전기화재의 조기 검출 알고리즘을 소개하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1996.11a
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• pp.95-100
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• 1996