• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1490-1491
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• 2007

The salt contamination on the distribution facilities, such as suspension insulator, line post insulator, lightning arrester, COS, is one of the major coastal areas because more than 90% of salt contaminated failure occurs in distribution facilities. Did to stain distribution facilities artificially according to Equivalent Salt Deposit Density(ESDD) grade. The electrical test were performed on the non-polluted and polluted facilities(ESDD B, C, D grade).

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1474-1475
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• 2007

해안거리에 따른 등가염분부착밀도(Equivalent Salt Deposit Density)의 수동오손측정은 동해, 서해, 남해의 해안가 및 제주도, 진도, 거제도의 도서지역에 설치되어 있는 112개소에서 매월 1개월 누적오손을 측정하였다. 이와 같이 수동으로 측정된 ESDD는 전력연구원에서 수행한 "전력설비의 염진해 대책에 관한연구(1988)" 및 "염진해 오손정도 및 기준정립에 관한 연구(2002)"에서 분석기법으로 활용한 통계분석기법을 사용하여 분석하였다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1476-1477
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• 2007

동일한 오손환경에서 자기재, EPDM, 실리콘 alloy 등의 현수애자에 흐르는 누설전류 변화를 관찰하여 오손과의 상관성을 규명하였다. 고창실증시험장에 신품과 경년품의 배전설비를 전주와 동일한 높이의 구조물에 설치하여 2006년 5월1일부터 11일 1일까지 약 6개월 동안의 누설전류를 측정하여 분석하였다.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1558-1560
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• 2004

Liquid-immersed pole transformers have utilized an insulation system consisting of natural cellulose-based materials and mineral oil for many years. If the transformers are installed with the abruptly changing load over limitation, its insulation materials are apt to unexpected aging with high temperature. Therefore we have been conscious of developing a transformer that is more thermally stable then conventional types. To measure temperature distribution in the winding of conventional and newly designed transformers, temperature sensors were installed fordirect reading of oil and conductor temperatures at transformers. And we conducted accelerating aging test for these transformers. The measuring data had made use of the design to hybrid insulation system. Also we could find the possibility of this insulation system to apply in pole mounted transformers.

• Proceedings of the IEEK Conference
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• 2004.06b
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• pp.447-450
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• 2004

The modeling circuit becomes more important in developing various magnetic devices regarding the fact that the competitive architecture and circuitry should be developed simultaneously. In this paper, we introduce a modeling circuit for hysteresis characteristic of a magnetic device, which is a major characteristic in the spin dependent magnetic material. This transistor-level model is conspicuous in that it can be usefully embodied in real circuits rather than conventional SPICE models are only for simulations.

• Journal of Power System Engineering
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• v.21 no.1
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• pp.5-10
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• 2017

Pitch drive system in wind turbine is composed by the planetary gear system to satisfied its required performance such as long life and light weight for gear train. When the planetary gear system can reduce its volume and weight, the power consumption of the wind turbine can be reduced. In this study, the planetary gear system of the pitch drive system in medium-sized wind turbine is obtained for weight reduction by shape optimization method. And the planetary gear system is verified for their strength by the structural analysis.

• 한국생물공학회:학술대회논문집
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• 2005.04a
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• pp.73-73
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• 2005

• Journal of Dairy Science and Biotechnology
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• v.22 no.1
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• pp.1-12
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• 2004

Nanofood is advanced functional food which food industry and food scientist try to develop process foods in near future. To be developed nanofood, nanofood materials are needed, such as biodegradable nanosphere material, biotechnical nanofood material, and protein and nanofood material. There are some food industrial applications with nanotechnology, such as nanoencapsulation, nanomolecule making, nanoparticle and powder making, nano separation, and nano extration. We can find several nanofoods and nanofood materials on the market. In addition, dairy industry is also in the first step for the development of nanofunctional food. However, nanoencapsulations of lactase, iron, vitamin C, isoflavone are developed for functional milk. Dairy industry needs various nanofood materials to be advanced functional dairy products.

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

• Journal of Environmental Science International
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• v.20 no.7
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• pp.919-927
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• 2011

A ecosystem model was applied for understanding of circulation process of state variables in marine ecosystem. A mass balance was conducted by calculating the physical process. The sensitivity analysis was conducted to know which coefficient is the most effective factor to the state variables in the model. The results of the mass balance indicate that the primary production was 58.6 ton C/day in the case of mass flux. DIN and DIP in nutrient ingestion of phytoplankton were each 7.9 ton N/day, 1.1 ton P/day. POC and DOC in mineralization of organic matter were each 10.8 ton C/day, 40.6 ton C/day. The results of sensitivity analysis showed that the maximum growth rate of phytoplankton was the most important factor for overall state variables. In the case of nutrients, Half saturation constant of DIN, and mineralization rate of DOM for COD were important factor.