http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
극초음속 비행체의 구조설계를 위한 공력 열하중 요소 개발
강연철(Yeon Cheol Kang),김규빈(Gyu Bin Kim),김정호(Jeong Ho Kim),조진연(Jin Yeon Cho),김헌주(Heon Ju Kim) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.11
본 연구에서는 극초음속 비행체의 공력/열/탄성학적 거동을 반영할 수 있는 효율적인 공력 열하중 요소를 개발하였다. 빈번하게 설계 변경이 이루어지는 초기 설계 단계에서 효율적으로 사용될 수 있도록 준 해석적인 관계식을 적용하여 공력 하중과 열 하중을 구조 변형의 함수로 기술하고, 이를 기반으로 공력 열하중 요소를 정식화하였다. 정식화된 요소는 상용 프로그램의 사용자 서브루틴 형태로 구현하였으며, 이를 이용하여 극초음속 비행체 조종면의 공력/열/탄성학적 유한요소 연계해석을 수행하고 그 유용성을 확인하였다. An efficient aerodynamic thermal load element is developed to reflect the effect of coupled aero-thermo-elastic behaviors in the early design stage of hypersonic vehicle. To this aim, semi-analytic relationships depending on structural deformation are adopted for pressure and thermal load, and the element is formulated based on the relations. The proposed element is implemented in the form of ABAQUS user subroutine, and coupled finite element analysis is carried out to investigate the aero-thermo-elastic behaviors of control surface of hypersonic vehicle. Through the analysis, usefulness of the proposed aerodynamic thermal load element is identified.
강연위(YW Kang),이춘노(CN Lee),이남훈(NH Lee) 대한산부인과학회 1974 Obstetrics & Gynecology Science Vol.17 No.1
1969년 1월부터 1972년 4월까지 만 3년 4개월 동안 분만한 산모 총 3202예중 조기파막 370 예에 대하여 분석 관찰하여 보면 다음과 같은 결과를 얻었다. 1) 발생빈도는 11.6%였다. 2) 조기파막예에서 발생빈도를 초산부군과 경산부군을 비교한즉 초산부군이 훨씬 높았으며 쌍태임신에서도 조기파막발생률이 높았다. 3) 임신중 산모의 질병은 86예었으며 중요한 것으로는 빈혈이 31예로 가장 많았고 임신중독 증이 30예로 다음 순위였다. 4) 잠재기간 24시간 내에 자연진통발현은 73.6%였으며 임신주수가 길어질수록 잠재시간이 짧았다. 5) 조기파막 370예중 제왕절개는 49예로서 제왕절개율은 1.24%였다. 6) 유도분만 56예중 52예에서 질식분만이 성공하여 유도분만 성공률은 92.9%였다. 7) 합병증으로는 ㄱ) 조산은 17.73% ㄴ) 이상태위는 10.50%였으며 그 중 둔위가 8.87%, 횡위가 0.83%, 안면위가 0.55%였다. ㄷ) 제대탈출은 0.83%였다. 8) 산욕열은 5.95%로 잠재기간이 길어짐에 따라 점차 상승하였다. 9) Prophylactic antibiotics의 사용군과 사용하지 않은 군의 산모이환율은 차이가 없다고 생 각되었다. 10) 백분율로 계산한 주산기사망은 5.8%로 생각되었으며 신생아 사망의 원인은 조산이 많 은 것으로 사료되었다. A clinical observation has been made on 370 cases of spontaneous premature rupture of mambranes out of 3202 deliberies at the Department of Obstetrics & Gynecology, Korea General Hospital from Jan. 1969 to Apr. 1972. The result are as follows : 1) The incidence of S.P.R.M was 11.6%. 2) The incidence of S.P.R.M in relation to parity was higher in primipara group rather than multipara group and also high incidence was noted in twin pregnancies. 3) Anemia and toxemia were the most cimmon disease in S.P.R.M. 4) Spontaneous labor develops in most cases within 24 hours (73.6%). 5) The incidence of cesarean section was 49 cases (13.24%) in all 370 cases with S.P.R.M. 6) The success rate of the vaginal delivery was 92.9% by intravenous oxytocin dripping method. 7) The complication was as follows : a) The incidence of premature birth weight was present in 17.73%. b) Abnormal presentation was present in 10.50% and breech, transverse lie and face presentation were present in 8.87%, 0.83% and 0.55% respectively. 8) Maternal morbidity was present in 5.95% and which was progressively increased according to prolonged lag period. 9) In comparison with used and noused prophylactic antibiotics, maternal morbidity was little change. 10) Perinetal death was present 5.8% and major cause of neonatal death was prematurity.
강연구(Kang, Youn-Ku),유영선(Ryou, Young-Sun),김영화(Kim, Young-Hwa),성문석(Sung, Moon-Seok),김종구(Kim, Jong-Koo),장재경(Jang, Jae-Kyoung),이형모(Lee, Hyoung-Mo) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The districts of underground geologic structure in Jeju island where underground air is distributed are lava cave, pyroclastic, open joint, and crushing zone. Such districts are identified to secure an enough airflow when air ventilation layer is to secure 25-35m in depth. In Jeju, Ground air is used for heating greenhouse and fertilizing natural CO₂ gas by suppling directly into greenhouse. But the heating method by suppling ground air into greenhouse directly bring about several problem. The occurrence of disease of the crops by high humidity is worried because the underground air which becomes discharge from underground air layer has over 90% relative humidity. The underground air is inadequate in heating for crops which need high temperature heating such as mangos, Hallbong and mandarin orange because the temperature of it is 15{sim}18?C. Also There is worry where the ventilation loss becomes larger because the air pressure inside greenhouse is high by supplying underground air directly. In this study the heat pump system using underground air as heat source was developed and heating performance of the system was analysed. Heating COP of the system was 2.5~5.0 and rejecting heat into greenhouse and extracting heat from underground air were 40,000~27,000 kcal/h, 30,000~18,000 kcal/h respectively.