• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권2호
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• pp.62-67
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• 2002

This paper provides the results of accelerated aging test of 18kV ZnO lightning arresters to investigate the leakage current characteristics. It was impossible to establish the replacement criterion for field operating lightning arrester because conventional aging test was only focused on the aging of ZnO elements. In general, it is possible to replace the aged arresters before the failure in the field using the leakage current measurement because it must be increased by the aging. But we can not use the method because we don't know the characteristics of the installed lightning arresters. Therefore in this paper we applied operating voltage and accelerating cycle which consists of temperature and humidity to the arresters. Then we measured the variation of total and resistive leakage current and found out the characteristics of the acted lightning arresters.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권6호
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• pp.271-277
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• 2002

In this paper, a MEMS silicon package is newly designed, fabricated for HMIC, and characterized for microwave and millimeter-wave device applications. The proposed package is fabricated by using two high resistivity silicon substrates and surface/bulk micromachining technology. It has a good performance characteristic such as -20㏈ of $S_11$/ and -0.3㏈ of $S_21$ up to 20㎓, which is useful in microwave region. It has also better heat transfer characteristics than the commonly used ceramic package. Since the proposed silicon MEMS package is easy to fabricate and wafer level chip scale packaging is also possible, the production cost can be much lower than the ceramic package. Since it will be a promising low-cost package for mobile/wireless applications.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권9호
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• pp.468-474
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• 2003

This paper describes the development of an open frame type high power density switching converter. It is based on the active clamp forward converter with synchronous rectifier, and packaged by using the open frame and multi-layer printed circuit board (PCB) technology to achieve the higher power density. Furthermore, the windings of transformer and inductor are also realized by multi-layer PCB so that it also contributes to achieve higher power density. Through the experiment on the prototype converter of 50[W], it is confirmed that power density of 50[W/i$n_3$] and maximum efficiency of over 91[%] are obtained.

• E2M - 전기 전자와 첨단 소재
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• 제10권1호
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• pp.61-67
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• 1997

We have studied dielectric properties of sol-gel derived tantalum oxide thin films as the insulators. As the sample is annealed from 300.deg. C to 700.deg. C, it is found amorphous below 600.deg. C and crystalline over it. Dielectric constant is maximum(18.6) when Ta$_{2}$O$_{5}$ film was annealed at 400.deg. C. It is found that dielectric strength in Ta$_{2}$O$_{5}$ film annealed at 400.deg. C (1.5MV/cm) increases and then decreases over annealed at 500.deg. C. This phenomenon was attributed to pinhole effect and crystallization. The de conduction properties can be interpreted by Poole-Frenkel effect.ect.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집 방전 플라즈마 유기절연재료 초전도 자성체연구회
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• pp.34-37
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• 2004

It is well known that Ag-CdO alloy for electrical contactor has been widely used in weak or middle electric current field. But it is necessary to decrease Cd contents without decrease of contactor property because Cd is harmful to human body. The present work has been carried out to investigate effects of Mm (misch metal) addition on the property of Ag-CdO alloy for electrical contactor. As the results of present works, hardness and strength was improved and arc resistance was improved, also, in spite of decrease Cd contents by the Mm addition. It was estimated that Ag-oxide particle was refined by Mm addition.

• 전기학회논문지
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• 제59권11호
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• pp.2089-2092
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• 2010

There are many cases that interrupt the production process because of malfunctions caused by electronic circuit boards which control equipment, but it is difficult to distinctly identify the causes in many cases. Especially, CMOS devices with the control logic circuit return automatically to normal state after their own faults. Therefore it is not easy to analyze the problems with electronic circuit boards. Recently, nuclear power plant experienced a failure due to the malfunction of electronic circuit boards and it was identified that the reason of the malfunction was because of latch-up phenomenon caused by external surge in electronic devices. This paper presents the causes and the phenomenon of latch-up by experiment and also a way using counter EMF diodes, noise filters and surge protective devices to prevent latch-up phenomenon from electronic circuit boards, finally confirms the effectiveness of the result by experiment.

• 조명전기설비학회논문지
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• 제29권2호
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• pp.91-96
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• 2015

There are provision for risk analysis in IEC standards. It is to determine the need for installation of a surge protection device (SPD) in order to protect the low-voltage electrical installations from overvoltages caused by atmospheric phenomena and the like. However, scattered many related standards, the lack of details are not easy to apply it in the field. We investigated the relevant domestic and international standards for applies to the international standards in domestic. And we proposed the flow chart for determining the need for protection of the low-voltage electrical installations from overvoltage due to atmospheric phenomena and it set the appling target facility.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.102-103
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• 2007

The electrical characteristics of high power LIGBT implemented by CMOS process are described and compared with those of high voltage LDMOSFET with the same device dimensions. LIGBT has exhibited approximately 8 times superior current drive capability than LDMOSFET. The proposed p+/n+ anode structure resulted in the significant increase of on-state breakdown voltage of LIGBT. Therefore, LIGBT suggested in this paper is one of the promising candidate for smart power IC applications.

• 한국전기전자재료학회논문지
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• 제32권6호
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• pp.466-471
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• 2019

Road photovoltaic power generation is a technology that combines photovoltaic power generation while maintaining the function of the existing road by installing special photovoltaic modules on it. In this paper, we developed three types of modules and structures suitable for sidewalk blocks and element technology for the development of a solar road module for a sidewalk and bicycle road. The road solar potential in Korea is 10 GW. After analyzing the daily data obtained after the construction of a 10 kW solar road testbed, it was found that its utilization rate compared to the general photovoltaic energy is 80%.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2011년도 제44차 하계학술발표논문집 19권2호
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• pp.165-169
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• 2011

저탄소 녹색성장 정책의 일환으로 추진되는 Smart Grid 사업은, 전력인프라와 IT인프라가 융합 되면서 지능화된 전기 에너지의 효율성 향상을 목적으로 전기망 내 송배전을 실시간으로 관리할 수 있게 운영하는 지능형 전기망이다. 하지만 기존의 인터넷망과 IT 통신 인프라와 융합되면서 Smart Grid 인프라에서도 IT보안 취약점 문제가 존재한다. 본 논문에서는 Smart Grid 인프라를 요소별로 분석한다. 그리고 Smart Grid 인프라의 보안성 분석을 통하여 보안의 취약점을 가져 올 수 있는 Smart Grid에 대한 보안 이슈를 분석한다. 그리고 Smart Grid 보안성 기준에 따른 보안기술정책을 연구하고, 보안 표준과 보안 방안을 제시한다. 본 연구를 통하여 안전한 Smart Grid 보안기술정책을 위한 법 제정에 기초자료가 될 것이다.