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- 저자 : 정은환(Eun Hwan Jeong) (검색결과 104 건)
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단일 융모막 쌍태아에서 한쪽 태아의 터너 증후군 증례 보고
장정희 ( Jeong Hui Jang ),경규상 ( Kyu Sang Kyeong ),홍덕호 ( Deok Ho Hong ),홍승화 ( Seung Hwa Hong ),지일운 ( Il Woon Ji ),정은환 ( Eun Hwan Jeong ) 대한주산의학회 2014 Perinatology Vol.25 No.4
Monochorionic twins with discordant karyotypes are rare and mostly caused by post-zygotic mitotic nondisjunction. A 32 year old nulliparous woman at 11 weeks of gestation with spontaneous twin pregnancy wasreferred to our hospital. An amniocentesis was performed in both amniotic sacs at 15 weeks of pregnancy. Onefetus in monochorionic twin pregnancy was diagnosed with Turner syndrome with cystic hygroma, and theother fetus was normal. Because of high mortality rate in abnormal fetuses, the umbilical cord coagulation wasperformed using radiofrequency ablation to prevent the damage of co-twin that may be caused by the demiseof one fetus. After delivery, chorionicity of placenta was ascertained by pathologic exam. Postnatal findings ofphysical exam, abdominal and brain sonography were normal in the surviving neonate.
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임신 2기의 임신중절에서 misoprostol과 sulprostone의 임상적 효용성 비교
김정규 ( Jeong Kyu Kim ),문종필 ( Jong Pil Moon ),김용범 ( Yong Beom Kim ),지일운 ( Ill Woon Ji ),정은환 ( Eun Hwan Jeong ),김학순 ( Hak Soon Kim ) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.12
Objective : Our purpose was to compare the clinical efficacy of intravaginal misoprostol and that of intravenous sulprostone for termination of second-trimester pregnancy. Methods : The patients were assigned to misoprostol and sulprostone group, and the
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박편구,정은환,김진한,Park, Pyun-Goo,Jeong, Eun-Hwan,Kim, Jin-Han 한국항공우주연구원 2005 항공우주기술 Vol.4 No.2
Through a preliminary design process, four design candidates for a 1.4MW class partial admission turbine have been chosen and the numerical analyses using a frozen rotor method are applied to estimate their performance. Each flow analysis result was compared with others and the optimum design was selected. Flow characteristics in the passages and some types of losses induced by shocks and wakes were found from calculation results. A new rotor blade was redesigned based on these calculations and this result is compared with previous one through flow analysis.
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원인불명의 심한 복수를 동반한 태아에서 자궁내 복강-양막강 도관단락술
최정원 ( Choe Jeong Won ),문종필 ( Mun Jong Pil ),황태기 ( Hwang Tae Gi ),지일운 ( Ji Il Un ),정은환 ( Jeong Eun Hwan ),김학순 ( Kim Hag Sun ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.12
Although sporadic cases of transient fetal ascites have been described, pulmonary hypoplasia or hydrops fetalis may occur as potentially lethal complications of isolated fetal ascites. Antenatal fetal paracentesis may be useful in improving neonatal pulmo
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고혈압 임부에서 24 시간 활동 중 혈압 측정의 임상적 유용성
전현정(Hyeon Jeong Jeon),고병성(Byeong Seong Ko),곽남주(Nam Ju Kawk),김도형(Do Hyeong Kim),배장환(Jang Hwan Bae),김동운(Dong Woon Kim),남기병(Gi Byoung Nam),조명찬(Myeong Chan Cho),정은환(Eun Hawn Jeong) 대한내과학회 1998 대한내과학회지 Vol.55 No.1
Objectives: In the third trimester hypertensive pregnancies, we would like to evaluate effects of white coat hypertension, severity of hypertension and diurnal variation of blood pressure on the fetal outcome by using 24-hour ambulatory blood pressure monitoring. Methods: Hypertensives(n=50) and normotensives (n=14) in the third trimester of the pregnancy underwent 24-hour ambulatory blood pressure monitoring. We excluded hypertensives(n=5) who became pre-eclampsia patients. Hypertensives(n=45) were classified as white coat hypertensives(n=14, mean ambulatory blood pressure <139/87mmHg) and sustained hyprtensives(n=31). Sustained hypertensives(n=31) were divided as moderate to severe hypertensives(n=5, systolic blood pressure ≥160 mmHg or diastolic blood pressure ≥100mmHg ) and mild hypertensives(n=26). Sustained hypertensives were also divided into two grwps which had diurnal variation of blood pressure or not. To exclude effects of hypertension severity, effects of diurnal variation wane evaluated in hypertensives with similar mean arterial blood pressure. Gestational age, body weight, body weight for gestational age were used as parametars of the fetal outcome. Results : 1) The prevalence of white coat hypertension was 28%(14/50). 2) There were no significant differences in the fetal outcome between normotensives(n=14) and white coat hypertensives(n=14). 3) Body weight of fetus and body weight for gestational age in moderate to severe hypertensives(n=5) were less than those of mild hypertensives(n=26), but gestational age was not significantly different between two groups. 4) Body weight of fetus and body weight for gestational age in sustained hypertensives without diurnal variation(n=10) were less than those with diurnal variation(n=8), but gestational age was not significantly different between two groups. 5) All hypertensives who became pre-eclampsia (n=5) were severe hypertensives and had no diurnal variation of blood pressure. Conclusion: White coat hypertension in the third trimester was quite often and did not affect on the fetal outcome. The more severe hypertension and/or absence of diurnal variation of blood sure caused poor fetal outcome. Patients who became pre-eclampsia were severe hypertensives and had no diurnal variation of blood pressure. Ambulatory blood pressure monitoring may have several roles in the antenatal management of hypertenison.
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박편구(Pyun-Goo Park),정은환(Eun-Hwan Jeong) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
7톤급 터보펌프 구동을 위한 터빈 설계를 위하여 총 21종의 터빈 설계안에 대한 유동해석을 수행하였다. 계산결과를 바탕으로 가장 우수한 성능의 터빈을 설계하고 동익의 현절비, 코드길이, 그리고 형상이 터빈에 미치는 영향을 분석하였다. 이와 더불어 제작성을 높이기 위한 동익 끝단의 형상 변화가 터빈성능을 크게 저하시키지 않음을 확인하였다. Numerical calculations for the 21 variants of turbine designs for a 7 ton class turbopump have been conducted. The turbine design showing best performance is selected among calculated the turbine designs and the effect of the solidity of a rotor, the chord length of a rotor, and the blade shape on the turbine performance have been analyzed. The results also show that the modified leading and trailing edge shape of a turbine rotor to improve manufacturing performance does not degrade the turbine performance significantly.
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김진한(Jinhan Kim),정은환(Eun-Hwan Jeong),최창호(Chang-Ho Choi),전성민(Seong-Min Jeon),김진선(Jin-Sun Kim) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
본 논문은 유성기어를 적용한 터보펌프의 개념설계에 대하여 기술하였다. 발사체시스템에서는 무게가 가장 중요한 설계인자 중 하나이다. 케로신 혹은 메탄을 연료로 사용하는 터보펌프의 경우 통상 시스템의 간단성 때문에 1축(혹은 동축) 형식이 사용된다. 이 경우 단점은 산화제펌프와 연료펌프의 회전수가 서로 최적이 아닌 상태에서 작동하게 되는 것이다. 각 펌프가 최적 회전수에서 작동하고 또한 증가된 회전속도로 부터 부품의 효율 증대와 무게이득을 최대화하기 위해서는 터보펌프에 유성기어를 적용하는 것이 최선의 방법이 아닐까 판단된다. 본 논문에서는 유성기어를 도입한 터보펌프의 개념설계와 가능성에 대해 제안하였다. The present paper describes a conceptual design of a turbopump which employs a planetary gear system. In a launcher system, weight is one of the most important design factor. In turbopump systems using propellants such as kerosene, or methane, single shaft systems are employed because of simplicity. One of the main disadvantages of this system, however, is the same rotational speed of both pumps and a turbine which forces to operate under non-optimum condition. To operate each component in optimum or favorable rotational speeds, a planetary gear system may be the best choice when the compactness and efficiency of a turbopump system is considered. A conceptual design and feasibility of the turbopump system adopting a planetary gear system is suggested.
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