• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1068-1070
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• 2005

This study sorted high voltage motors by the voltage and the capacity and analyzed the property of motor-start. So we found out some problems of the starting circuit from several sites, and made the answers of the problems. If these results of our study are utilized in new WTPs, the safety of the starting circuit will be improved and the life of electric power system will be longer. We recommend this study as a reference when our company founds the standard of electric facility design.

• Management & Information Systems Review
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• v.22
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• pp.61-84
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• 2007

This research aims to find the legal classification of non-profit corporation, to check the pattern of non-profit corporation, to examine thoroughly the present condition of non-profit corporation, and to make a good solution of the problems of non-profit corporation. The findings of this study about the present condition of non-profit corporation are as follows. First, there is an unclear understanding of non-profit corporation and an public fund, Second, a board of directors and a founder control an aim of non-profit corporation freely, Third, there is an unclear management of activity and accounts of non-profit corporation, forth, there is an vague mission of foundation, fifth, some of non-profit corporation supported social welfare project for marketing strategy. and the last non-profit corporation made an competition unnecessarily. On the basis of study result, the researcher make some suggestion for an revitalizing of non-profit corporation. First, it is very important of making a clear mission to manage the non-profit corporation. Second, there is an autonomy and neutrality of non-profit corporation. Third, we make an irrational law better, forth, we make a settled the donation culture. and the last it is necessary of make an foundation for international society.

• Tribology and Lubricants
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• v.27 no.3
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• pp.167-173
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• 2011

In this paper, an actuator model of the thrust magnetic bearing for the flywheel energy storage is derived using magnetic circuit theory. And we compared this result with finite element magnetic field analysis result. Based on the actuator model, we made a simulation model of the thrust magnetic bearing system. We showed the closed loop transfer function and sensitivity function of the thrust magnetic bearing system using both the simulation model and the experiment. The experimental result at rotation velocity 18,000rpm of thrust magnetic bearing system is included.

• 한국약용작물학회:학술대회논문집
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• 2011.04a
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• pp.106-107
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• 2011

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.252-253
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• 2011

Many errors are broken out when hydro power plants are operating connected to electric power system. To minimize ripple effects of accidents, a hydro power plant is separated by a circuit breaker consisting of each protection equipments. In this paper, I will analyze a cause of abnormal events of emergency stop and therefore I take measures and suggest solutions for similar cases.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1840-1841
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• 2011

본 논문은 최근 에너지 절감 및 생산성 향상, 품질 향상, 원가 절감에 지대한 영향을 미치고 있는 인버터의 제어방안에 대한 연구이다. 보다 효율적인 펌프운전을 위해 댐 원수를 취수하는 인라인 가압장에 정밀성과 제어성능이 우수한 가변속 전력변환장치인 인버터가 적용되어 운영되었다. 하지만 인버터 1대 적용시 고 rpm에는 효율이 급격하게 떨어져 전력요금 상승을 가져오고 또한 펌프기동반 내부 온도 상승 및 권선온도 상승을 가져옴으로써 전반적인 효율 저하를 나타나게 됨에 따라 인버터 조합 운전 방안을 찾고 에너지 절감 방안을 모색하고자 실제 적용사례를 중심으로 연구되었다.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.427-428
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• 2006

최근 대기환경 악화로 송전용 철탑 도장의 열화가 촉진되어 내후성이 강한 신도료를 송전철탑에 적용이 필요하게 되었다. 도료 제조업체의 신도료로 도장시편을 제작하여 옥외에 폭로후 전문기관에서 성능을 확인하였으며, 이를 토대로 도료의 재질을 실리콘 아크릴우레탄계로 변경하였으며, 철탑용 도료 성능시험 기준을 강화하여 철탑 재도장에 따른 유지보수 비용 절감이 될 수 있도록 개선하였다.

• 한국가스학회:학술대회논문집
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• 2001.10a
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• pp.231-239
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• 2001

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2160_2161
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• 2009

본 논문에서는 최근 신축된 건축물의 수전실에 설치된 접지단자함 내부의 보호도체와 접지선의 접속실태, 접지방식 및 접지저항 측정용 보조전극의 매설 실태 등을 분석하였다. 또한, 측정용 보조전극의 매설 실태를 토대로 접지전극을 선정하여 보조전극의 위치 변화에 따른 접지저항의 오차를 측정 및 분석하였다.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 1999.05a
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• pp.71-71
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• 1999