http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
홀로그래피 간섭 토모그래피 개발 및 3차원 자연대류 열전달에의 적용
이수만(Soo-Man Lee),강민구(Min-Gu Kang),차동진(Dong-Jin Cha),주원종(Won-Jong Joo),강보선(Bo-seon Kang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this study, a practical holographic interferometric tomography system, which is instantaneous and non-contact for measuring three dimensional flow field, was developed. The system consists of holographic recording reconstruction system, fringe analysis code and computational tomography code and it is developed with GUI environment for general users. The developed system was applied to three-dimensional natural convection from a discrete flush-mounted circular heat source on the bottom of a cubic enclosure. The heat source was located at the offcenter of the bottom plate so that three-dimensional temperature field can be achieved. A set of multi-directional holographic interferograms was recorded by employing a double-reference beam, double-exposure holographic technique. Optical pathlength data were extracted from the recorded interferometric data and finally three dimensional temperature field inside the cube was reconstructed.
이수만(Soo Man Lee),김동윤(Dong Yun Kim),안정혁(Jung Hyuk An),이철성(Cheol Seng Lee),신우철(U Cheul Shin) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.10
In this study, we analyzed the annual heating and cooling energy requirements of reference building with 97 certificated windows using TRNSYS 17, to review the applicability of the “Window Energy Consumption Efficiency Rating System” to the office building. The analyzed model was a medium-size office building with lightweight curtain walls and a window-to-wall ratio of 52%. The results are as follow : First, the annual total thermal load was 60,261 to 111,616 kWh and the ratio of heating load to cooling load was 1:9 showing that cooling was the main factor of the thermal load. Second, the total thermal load by SHGC showing an almost perfect linear relationship. The F-test significance probability in the regression model was 0.000 meaning statistical significance and the coefficient of determination was 0.9656 showing high correlation. In contrast, the F-test significance probability in the regression model by U-value was 0.00484 showing statistical significance but the coefficient of determination was 0.0805 showing low correlation. Third, the SHGC of window was the main factor of the total thermal load in the office building. It showed the limitation of subject in “Window Energy Consumption Efficiency Rating System” which was limited to insulation performance and airtight performance. Thus, in to evaluate the window sets in terms of energy saving, the “Window Energy Consumption Efficiency Rating System” with SHGC should be considered.
이수만(Soo Man Lee),김동윤(Dong Yun Kim),안정혁(Jung Hyuk Ahn),엄재용(Jae Yong Eom),신우철(U Cheul Shin) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
본 논문에서는 국내 건축구법의 창 설치방법과 설치위치에 따른 접합 열교부위의 열성능을 평가하고 이를 설계자료로 제공하고자 한다. 연구방법으로는 시방서를 통한 국내 창호 시공방법을 조사하고 “창호에너지 효율등급” 1등급의 이중창과 “건축물의 에너지 절약 설계기준” 중부지방을 기준으로 하는 벽체를 선정하였다. 내·외단열에 따른 선형열관류율을 분석하였다. 분석결과 이중창의 좌·우 트랙의 위치에 따라 선형열관류율 값이 차이가 났으며, 내단열에 비해 외단열의 경우가 높은 것으로 나타났다.
실증실험을 통한 측정 위치에 따른 주거공간 환기성능 평가
곽병창,이수만,김길태,김종엽,Kwag, Byung Chang,Lee, Soo Man,Kim, Gil Tae,Kim, Jong Yeob 한국토지주택공사 토지주택연구원 2022 LHI journal of land, housing, and urban affairs Vol.13 No.3
Ventilation plays an important role in controlling indoor air quality. Due to the recent spread of infectious diseases such as COVID-19 and with people spending more time indoors, there's been increased attention on the importance of ventilation performance. In many countries, ventilation is regulated by airflow rates and the number of air changes per hour (ACH). However, airflow rates and ACH alone do not provide an accurate account of actual indoor pollutant removal and ventilation uniformity in a space. This study looked into the ventilation performance of an actual residential unit using several sampling points instead of basing it off of airflow and air change rates. Literature review was used to derive relevant influencing factors and the tracer gas dilution method was used for the field test. The study measured air velocity, age of air, and ventilation efficiency at several locations and compared them to the average value at the center of the test space to determine the differences in ventilation performance at the selected measurement points. The study showed that different sampling locations resulted in different ventilation values. Findings of this study will be used to develop an experimental procedure for evaluating indoor ventilation performance of actual residential spaces.
XeCI 엑시머 레이저에서의 Pulse Stretching 효과
주홍(Hong Chu),김동환(Dong Hwan Kim),이수만(Soo Man Lee),전영민(Young Min Jhon),최상삼(Sang Sam Choi),박대윤(Dae Yoon Park) 한국광학회 1993 한국광학회지 Vol.4 No.4
용량이행형 방전회로를 이용하여 장펄스 XeCI 엑시머 레이저를 발진 시켰으며, 펄스폭은 150㎱ (FWHM)이었다. 펄스폭에 영향을 미치는 가스분압 및 capacitance의 비에 따른 펄스폭의 변화를 관측하였으며, 이로부터 단펄스에서 장펄스로의 발진을 쉽게 얻을 수 있음을 알았다. 일정 가스 혼합 비율 ([Xe]/[HCI]=15)의 상태에서 HCI과 Xe가스의 분압이 감소함에 따라 광 펄스폭의 최대 변화량은 125㎱이었고, 일정 압력 하에서의 capacitance비(Cm/Cp) 변화에 따라 늘어나는 광 펄스폭의 변화량은 60㎱이었다. Long pulse XeCI excimer laser with 150㎱ (FWHM) pulse duration is developed using a simple capacitor-charge transfer circuit. We measured the laser pulse width varying the gas mixture ratio and capacitance ratio, which dominantly affect the pulse width. In this way we can easily stretch the pulse width from short pulse to long pulse. The pulse width was stretched by 120㎱ as the partial pressure of HCl and Xe gas was reduced under constant gas mixture ratio ([Xe]/[HCI]=15), and by varying the capacitance ratio (Cm/Cp) under fixed pressure, the pulse width was stretched by 60㎱.
김동환(Dong Hwan Kim),주홍(Hong Chu),최상삼(Sang Sam Choi),이수만(Soo Man Lee) 한국광학회 1993 한국광학회지 Vol.4 No.1
용량 이행형 방전여기에 의한 소형 XeCl레이저를 제작하고, 가스 혼합비에 따른 출력특성을 조사하였다. 내장형 capacitor에 의한 자동 예비전리 방식과 2.7 ㎝ 간격의 Chang형상으로 가공된 전극구조의 레이저를 구성하여 2.7 ㎝×1.5 ㎝ 크기의 출력 빔을 얻었고, Xe과 HCl의 농도 변화 및 완충 기체의 종류에 따른 최대 출력 에너지및 최대 효율 조건을 조사하였다. 최대 레이저 펄스 에너지는 Ne 완충기체를 사용시 230 mJ이며, 단위 방전 체적당 1.1J/l의 에너지를 얻었으며, 최대 에너지 효율은 1.6%이었다. 1 : 3의 낮은 비율의 피-킹 캐패시턴스의 구성에 의해 레이저 펄스폭은 장펄스 효과를 나타내 foot-to-foot 200 ㎱로 측정되었다. Small XeCl laser of charge transfer discharge excitation was fabricated and output charateristics were investigated according to gas mixture ratio. Beam cross section of 2.7 ㎝×1.5 ㎝ was obtained by constructing excimer laser which preionization is operated automatically and which has chang profile electrode. According to the component gas mixture ratio, the condition of maximum output energy, efficiency were investigated. The maximum energy, efficiency and specific energy were obtained 230 mJ, 1.6% and 1.1 J/l, respectively. The long pulse effect is observed by constructing low peaking to main capacitance ratio of 1 : 3.