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NEC와 IEC 저압간선의 허용전류 감소계수에 관한 연구
임명환(Myung-Hwan Lim),최홍규(Hong-Kyoo Choi),박준열(Joon-Yeal Park),유해출(Hai-Chool Yoo),최대원(Dae-Won Choi),이정은(Jung-Eun Lee) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
The lower voltage is used, the more important the issue of current transmission becomes. The low-voltage feeder should be carefully selected am used, as its low-voltage is the one to be ultimately used. As the Korean Agency for Technology and Standards under The Ministry of Industry and Resource (current Ministry of Knowledge and Economics) announced, the production on the old standard (NEC) was abated since July 1st of 2006, as the new standard (IEC) was introduced. This suggests the reed of further study on the appropriate wire width under IEC standard. This article compares the application methods of calculating the low-voltage wire width of the reduction factors am voltage drop under NEC and IEC standards. This article also compares am provides a unified calculation formula for each of NEC and IEC standards, in order In analyze am reduce the errors caused by the difference between the roost widely-used simplified calculation am the formal calculation in estimating the voltage drop.
송영주(Young-Joo Song),임명환(Myung-Hwan Lim),최대원(Dae-Won Choi),김도형(Do-Hyung Kim),염성배(Sung-Bae Yeum) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.12
A low voltage wire should be used considering that a load used in the end is a low voltage. In regard to these wires, there are needs for research about the wire thickness calculation in accordance with IEC standard because the standardization process for IEC (KS standard) was completed on June 30, 2005, and they stopped producing NEC-standard products by the order from Korean Agency for Technology and Standards under Ministry of Knowledge Economy (former Ministry of Commerce, Industry and Energy) since July 1, 2006. This study compared, in terms of the thickness calculation of low voltage wire, a reduction factor application by IEC standard about allowed current and an application for calculation of voltage drop. It also proposed the formula for IEC standard to decrease errors and resolve the difficulty of standardized calculation by analyzing the difference between simplified formula and standardized formula that are the most frequently used calculation method of voltage drop.
2-parameter criterion에 의한 탄소성 파괴확률 예측수법
김태식(Tae-Sik Kim),윤한용(Han-Yong Yoon),임명환(Myung-Hwan Lim),정의정(Ui-Chung Chung) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Put Many researchers have made much progress in studying an estimate for fracture probability of brittle materials. However, studies of the fracture probability for the elastic-plasticity have not been made yet. An estimate method for fracture probability which is grafted onto 2-parameter criterion and statistical probability analysis is not only introduced in this study, but also applied to the simple 2-dimensional model and carbon steel piping to evaluate the effect of random variable.
전기철도 누설전류의 희생양극법을 이용한 전식 방지에 관한 연구
염성배(Yeom Sung-bae),박준열(Park Joon-Yeal),임명환(Lim myung-hwan),박상욱(Park Sang-wook),강아람(Kang A-ram) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.10월
최근 KTX의 등장으로 기존에 조금씩 논의 되어오던 누설전류에 의한 전기부식이 전면적으로 등장하고 있다. 대전류를 필요로하는 KTX의 주면 지하매설물의 부식이 심각한 수준에 이르렀다. 따라서 이에 대한 대책이 시급한 상황이다. 전기부식을 방지하는 방법에는 몇 가지가 대두되고 있으나 경제성과 효율성을 고려하여 희생양극법을 이용하는 방법이 가장 알맞다고 판단한 바 본 논문에서는 이에 대해 기술하였다.
최준영(June-Young Choi),최홍규(Hong-Kyoo Choi),이근무(Guen-Moo Lee),최경한(Kyung-Han Choi),임명환(Myung-Hwan Lim),최신권(Shin-Gwon Choi),이정렬(Jung-Youl Lee),황상구(Sang-Gu Hwang) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
최근 교토의정서 협약 체결 후 전 세계적으로 각종 환경 관련 규제가 강화되고 있으며, 고유가에 따른 지속 가능한 에너지원의 필요성 확대에 따른 재생에너지분야의 연구가 집중적으로 이루어지고 있다. 이에 본 논문에서는 재생에너지 분야 중 풍력발전시스템에 적용하고자 우리나라의 지형 및 풍속을 조사 · 분석하여 풍력에너지를 검토해보고자 한다. each kind environment connection regulation is solidified worldwide after kyoto protocol recently, and research of revival energy field by necessity extension of source of energy that continuance is possible that follow to high oil price is consisting concentrically. In treatise that see hereupon to apply to wind force development system of revival energy field topography of our country and wind speed investigation · analyze and examine wind force energy wish to.
Pattern Search법을 이용한 강의실 조명 향상
심용식(Yong-Sik Shim),최홍규(Hong-Kyoo Choi),박승원(Seung-Won Park),서범관(Beom-Gwan Seo),임명환(Myung-Hwan Lim),신혜영(Hye-Young Shin) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
강의실은 학생들이 학습을 하는 공간으로 정확한 정보취득과 시작업을 요한다. 강의실의 조명환경에 대한 문제점은 학습효과의 저하뿐만 아니라 학생들의 시력에도 악영향을 미치게 된다. 따라서 학생들이 대부분의 시간을 보내는 강의실의 알맞은 조명을 얻기 위한 연구가 필요하다. 현재의 대학 강의실의 일반조명시스템과 다운라이트를 적용한 조명시스템을 컴퓨터 시뮬레이션을 통하여 비교, 검토해보면 다운라이트를 적용한 조명 시스템은 강의실의 조도를 개선하며, 등기구 초기 투자 비용의 절감으로 경제성을 향상시키고 에너지 절약을 가져올 수 있다. Lecture room, for student to study, need to get exactly information and show up what students are required. So, problems for illuminated environments are low effect of studying, and that students may get weak-sighted. Research is required to get enough lighting for lecture room which students spend most their time. If we compare lighting system for recent college lecture room with computer simulation, lighting system at the lecture room with down light will be improve intensity of illumination. Therefore we can get economical benefit and save energy.
신혜영(hye-young Shin),최홍규(hong-kyoo Choi),김용규(young-kyu Kim),안윤기(youn-ki An),최준영(June-young Choi),윤철구(cheol-gu Yoon),임명환(myung-hwan Lim),김종수(jong-soo Kim),서범관(beom-gwan Seo) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
화석연료의 문제점을 보완하고 있는 태양광발전 시스템은 태양전지 모듈의 온도에 따라 출력량이 급격히 변화하는 특성을 가지고 있다. 이러한 특성을 잘 이해하고 전력생산을 극대화 하기위해 태양전지의 온도를 낮추기 위한 방법을 고려하였다. 본 논문에서는 모듈의 앞면과 뒷면에 똑같은 온도 감소 설비를 한 후 뒷면의 온도를 낮추는 것이 발전량에 더 큰 도움을 준다는 결론을 도출하였다. Photovoltaic system that is overcoming the problem of fossil fuel, changes the output quantity rapidly according to the temperature of module. so, we studied this principle and considered the method making lower the temperature of module for maximization of electric power production. In this thesis, we concluded that, we fit on below and upper direction of the module to decrease at the same temperature. lower temperature of below direction is more useful for the generating quantity.
임명환,정의정,윤한용 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Bending and fracture damages occur on marine propellers in services. A method by heating and hammering is generally used to repair the propellers. However, it is inevitable that the strength is degraded by using the method. A new method to increase the fatigue strength of propeller materials was suggested in the previous study. In this study, we adapted the method to repair bended propeller materials and proved its usefulness by the static and fatigue testing.
김태식,윤한용,임명환,정의정 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
Many researchers have made a lot of progress in studying the evaluation of fracture probability of brittle materials. However, studies of fracture probability for elastic-plasticity have not been made yet. An evaluation method for fracture probability which is grafted onto a 2-parameter criterion and statistical probability analysis is not only introduced in this study, but also applied to the simple 2-dimensional model and carbon steel piping to evaluate the effect of statistical variables.