• The Bulletin of The Korean Astronomical Society
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• v.32 no.1
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• pp.66.1-66.1
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• 2007

• The Bulletin of The Korean Astronomical Society
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• v.37 no.1
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• pp.81.2-81.2
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• 2012

Using KVN we made a fringe survey of 44GHz Class I CH3OH maser sources, which have not detected by any VLBI facility. We will present the results and discuss the implications.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.953-956
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• 1997

Micro drilling characteristics by EDM method was investigated. In detail, Micro tool electrode for EDM drilling was machined by use of WEDG method and micro hole was drilled using the machined tool electrode in SUS plate. The machining accuracy and time was compared in a different dielectric fluid. As a result, it was convinced that this method could be utilized as a fabrication technology of micro mold or micro 3 dimensional parts.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.05a
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• pp.894-897
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• 2000

본 연구에서는 초미세 형상부품의 제작기술로서 방전가공기술의 활용을 전제로 하여, WEDG(Wire electric discharge grinding: WEDG)가공에 있어서 가공액의 공급방식을 포함한 공급환경이 표면상태에 미치는 영향에 관하여 조사하였다. WEDG법을 이용한 형상가공에 있어서는 단위 방전 펄스당의 에너지를 극소화하여 제거단위를 미세화함으로서 가공정밀도(가공표면 및 가공형상의 정밀도)를 향상시키는 것이 가능하다.(중략)

• The Bulletin of The Korean Astronomical Society
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• v.35 no.1
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• pp.42.1-42.1
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• 2010

한국천문연구원 한국우주전파관측망(KVN)은 2008년 KVN연세-VERA 간의 프린지 검출에 이어, 2009년 10월 KVN 모든 기선 간의 22GHz와 43GHz 프린지 검출에 성공하였다. 본 발표에서는 KVN 프린지 검출 시험의 과정과 결과를 요약하고, 또한 현재 수행 중인 KVN의 두 주파수 동시 VLBI 시험관측의 진행과정을 보고 하고자 한다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2000.04a
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• pp.246-251
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• 2000

In this paper, Wire electric discharge grinding(WEDG) method for manufacturing the micro shaft was introduced and the machining characteristics was investigated. from the experimental results, it was concluded that high surface integrity could be obtained by use of dielectric fluid spraying method and small capacitive condenser.

• The Bulletin of The Korean Astronomical Society
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• v.33 no.2
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• pp.38.1-38.1
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• 2008

• Journal of Plant Biology
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• v.5 no.3
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• pp.37-38
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• 1962

The original plant for a medicine, Forsythia collected from Wui-Sung country, Kyungsangpuk-do, Korea, was identified as Forsythia viridissima by its characteristic greenish bark and clearly square stem as observed from the culture works at the Forest Experiment Station of Sung Kyung Kwan University. F. viridissima, an indigenic plant of China, is believed to be introduced to Korea as a nursary stock or brought by seeds sometime in the past. In Korea at present two other species of Forsythia, namely, F. suspensaa and F. japonica have also been cultured besides F. viridissima as an ornamental.

• Journal of the Korea Construction Safety Engineering Association
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• s.53
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• pp.52-62
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• 2011

Purpose of this study was to comprehend the influence that worker's lob stress caused by the distinct characteristics of construction work affect on construction management. Proven through previous studies of job stress measurement method, physical environment, job demands, job autonomy, interpersonal conflict are derived as typical factors. We analyzed causal relationships between the factors using structural equation modeling under the hypothesis that job stress have effect on the construction management. As a result, successful job stress management for construction management plan is proposed.

• 전기의세계
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• v.32 no.1
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• pp.5-13
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• 1983

본고의 내용은 다음과 같다. 1. EMTP 개발 및 사용현황 2. EMTP의 기능 3. EMTP의 기본이론 4. 한전의 EMTP의 적용실례