• Journal of the Korean Society for Precision Engineering
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• v.22 no.11 s.176
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• pp.104-110
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• 2005

GIS(Gas Insulated Switchgear) is used in electric power system, to insure non conductivity, breaking capacity and operating reliability. The commercial dynamic analysis code COSMOS MOTION and 3-D modeling program SOLID WORKS were used to simulate dynamic analysis of the closing resistors of the GIS in this paper. To reduce chatter vibration of closing resistors, the motion of moving and fixed parts of closing resistors were simulated by varying the spring constant, the damping coefficient and the mass of moving and fixed parts. The simulated results were compared with experimental results. As a result, chatter vibration of closing resistors of the GIS could be reduced by using the results. These data can be used to determine the spring constant, the damping coefficient and mass of a moving part to reduce chatter vibration when the next model is developed.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2002.04a
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• pp.39-39
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• 2002

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2002.04a
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• pp.58-58
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• 2002

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2002.04a
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• pp.72-72
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• 2002

No Abstract, See Full Text

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2003.04a
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• pp.67-67
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• 2003

The NAD$^{+}$-dependent 15-hydroxyprostagladin dehydrogenase (15-PGDH) is a key catabolic enzyme responsible for the control of the biological activities of prostagladins. So far the gene has been found in a diverse organism including three insect dipteran species and one lepidopteran species. In this study, a cDNA encoding the 15-PGDH gene homologue was isolated from the cDNA library of the mole cricket, Gryllotalpa orientalis. (omitted)d)

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2005.05a
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• pp.151-153
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• 2005

군포시내 중, 소기업의 산업 활동으로 배출된 오염물질과 인간의 생활로 인해 발생된 오염원들이 도시권역 하천에 미치는 영향을 알아보고 과거와 현재의 수질개선 정도를 알아보기 위해 지난 4년(2000~2004)간의 수질 분석하였다. 도시권역 조사지점 중 수질이 가장 악화된 지점은 당정천 하류 지점으로 이는 주변 산업시설에 의한 영향이 가장 큰 것으로 판단되며 비도시권역 중 수질이 가장 악화된 지점은 죽암천으로 이는 인접주변의 생활하수와 소규모 축산농가의 유기물 유입이 원인인 것으로 판단된다. 특히 강우시 축산분뇨 등이 비점오염원으로 배출되는 것을 방지하여야한다.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.370-372
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• 1995

This paper mainly, describes the electrical characteristics caused by the change of structure in solid state of specimen by electron beam irradiation of high temperature-low expension type molding materials of power semiconductor element. The experiments on physical properties and electrical characteristics for the specimen irradiated electron beam are carried ont. For the investigation on physical properties, XRD analysis is used. And for the experiment of electrical characteristics, measurement of volumn resistivity is used.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1042-1043
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• 2008

본 논문에서는 국내 경전철에 사용되는 선형유도전동기의 성능 분석을 통하여 지상 2차측의 방식을 선정하고자 한다. 일반적으로, 등가회로를 이용한 해석적 방법은 선형전동기의 커다란 공극, 단부효과, 횡방향 효과, 3차원 형상, 회전기에 비해 상대적으로 큰 누설 등으로 인하여 성능을 정확히 예측할 수 없다. 또한, 수치해석적 방법은 고용량의 메모리와 해석시간을 요구한다. 그러나 본 논문에서는 등가회로법과 수치해석법을 혼용하여 좀 더 빠르고 정확한 성능 분석을 수행하였으며 제안된 방법을 통하여 도시철도차량용 선형유도전동기에 적합한 2차측 방식을 선정하였다.

• 대한방사선방어학회:학술대회논문집
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• 2010.04a
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• pp.54-55
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• 2010

• Journal of Advanced Marine Engineering and Technology
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• v.28 no.2
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• pp.217-227
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• 2004

The bowl in a ship purifier suffers from high stress and high temperature in a detrimental heavy fuel oil environment. Duplex stainless steel(DSS) is a primary material to withstand this harsh condition. Newly-manufactured STS 329 grade DSS has been evaluated by various mechanical and electrochemical test methods. Eight heat treatment(HT) conditions with different temperature and time were applied to the DSS samples to improve corrosion resistance. Microstructure and polarization test results concluded the optimum HT condition was $1.090^{\circ}C$-60 minutes. Confirmation experiments for applying to a real bowl including stress corrosion cracking test exhibited the reproducibility of the optimum HT condition.