• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.16_17
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• 2009

지능형 배전망을 추구하기 위해 본 논문에서는 배전계통의 루프 구성과 방사상의 보호협조 방법을 수정한 새로운 루프구성에 대한 보호협조를 제안하였다. 그리고 배전 자동화가 되어 있다는 전제 하에서 제안된 보호협조 방법을 토대로 방사상 계통과 방사상 보호협조를 그대로 적용한 루프 배전계통, 마지막으로 제안된 보호협조 방법을 적용된 루프 계통에 대한 신뢰도 이득을 분석하였다.

• Proceedings of the KWS Conference
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• 2006.10a
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• pp.18-19
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• 2006

The purpose of this study is to evaluate the behavior of residual stress at the weldment of pressure vessel by local Post Weld Heat Treatment(PWHT). In order to do it, residual stress were measured before and after local PWHT by XRD on the test piece first. And then, the results of finite element(FE) analysis based on thermal-elasto-plastic-creep theories were verified by comparing with the measured results.

• Korean Architects
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• no.9 s.317
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• pp.56-63
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• 1995

본지에서 소개하고 있는 '한국의 건축가' 기획연재는 그동안 게재 되었던 이희태(95년 3월호 ~ 5월호), 김정수(95년 6월호 ~ 8월호)에 이어 건축가 김수근(1931~1986)에 대해 소개하고자 한다. 이번호부터 소개되는 건축가 김수근편 에서는 그가 태어난 1931년부터 1960년까지의 유년시절과 건축의 수련기(성장배경과 서울의 북촌, 일본에서의 건축교육)를 시작으로 1960년부터 1972년까지의 한국건축의 새로운 이념형을 찾아서(김수근 건축연구소, 한국종합기술개발공사, 인간환경 계획연구소), 공간시대(1972년~1986년)등으로 구분하여 그의 작품세계를 분석ㆍ소개하고자 한다.

• Proceedings of the Korean Vacuum Society Conference
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• 1992.07a
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• pp.23-27
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• 1992

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.6
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• pp.944-950
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• 2008

When small cogenerators are operated in connected with power system, there are many positive aspects such as the reduction of power plant construction, making a improvement of power security etc. At the same time, there are some negative effects or difficulties such as we should make sure of protective coordination, especially, Actually these are not fault, but it is likely to consider the current as the fault. This is one of major causes of malfunctions for protective relays in power distribution system which is including interconnection point. Thus, in this paper, We showed that the directional protection is necessary to the dispersed generation system which is including connection point. We also executed contingency analysis to find out the magnitude of fault current and direction which are classified by fault points, length of line and kinds of faults using ETAP power system analysis program.

• Korean Journal of Materials Research
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• v.7 no.4
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• pp.330-338
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• 1997

Pb-In솔더를 Si기판에 증착후 리플로시 가열 속도와 플럭스 사용에 따른 솔도볼 형성 거동, 증착 솔더이동, UBM(under Mump Metallurgy)의 Au층과 In간의 금속간 화합물 형성에 관하여 연구하였다. 가열 속도가 1$^{\circ}C$/min에서 1$0^{\circ}C$/min, 2$0^{\circ}C$/min로 증가하고, 플럭스를 적용한 경우 솔더볼은 용이하게 형성되었다. 특히 플럭스를 사용하여 형성시킨 솔더볼에서는 UBM Au층과 In간의 반응에 의하여 Auln 금속간 화합물이 형성되었다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.7
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• pp.1116-1126
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• 1997

The effects of friction between powder and a mandrel on densification behavior of metal powder were investigated under cold isostatic pressing. The elastoplastic constitutive equations based on the yield function of Shima and Oyane were implemented into finite element program (ABAQUS) to simulate compaction responses of metal powders during cold isostatic pressing. The friction coefficients between powder and mandrels with different roughness were determined by comparing experimental data and finite element results. Density distributions in the powder compacts were also studied for different friction coefficients. Finite element results were compared with experimental data for pure iron powder under cold isostatic pressing.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.271-274
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• 2007

In this paper, measuring equipment for arcs which are caused by losing contact between a pantograph and a catenary in the electric train, TTX, was designed and we actually measured arcs of current and voltage at 2007. 5. 16 $\sim$ 17, 2007. 5. 31, 2007. 6. 18 $\sim$ 19 and 2007.6. 30 $\sim$ 31, a total of 4 times. The TTF tool was made by LabVIEW software and the actually measured arc data were analyzed by the FFT tool. The analysis result showed that the arc current and voltage contains much harmonic, so we must consider problems of EMS and EMI in the main circuit system of the electric train TTX.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.6
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• pp.1893-1902
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• 1996

Densification behavior of 316L stainless steel power under die pressing was studied. The efects of friction between the powder and die wall under different die pressing modes were also investigated. The elastoplastic constitutive equations based on the yield functions of Fleck-Gurson and of Shima and Oyane were implemented into finite element program(ABAQUS) to simulate die compaction processes. The finite element results were compared with experimental data for 316L stainless steel powder under die pressing.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1328-1329
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• 2011

풍력발전 시스템의 원리를 이해하고, 대표적인 분산전원인 풍력발전 시스템을 전력계통에 연계시켜 그 특성을 모의, 분석할 수 있도록 전력계통 과도모의해석 프로그램인 PSCAD/EMTDC를 사용하여 현재 사용하고 있는 풍력발전 시스템 그리고 연계계통을 고려하여 구성하였고, 이 분산전원 모델이 유효한지 보이기 위하여 출력파형을 보였다. 그리고 이 분산전원 모델을 연계계통내 보호계전시스템등과 같은 분산전원과 관련된 전반적인 연구분야에 유용하게 이용할 수 있을 것으로 기대된다.