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김우철(U Chul Kim),임수빈(Soo Bin Yim),박운호(Woon Ho Park),정해련(Hae Ryon Jung),이호(Ho Lee),이정은(Jung Eun Lee),이지영(Ji Young Lee),이우영(Woo Young Lee) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.8
Misoprostol (Cytotec) is a prostaglandin E, analog used in prevention of nonsteroidal anti-inflammatory drugs induced gastric ulcer and has a uterotonic effect. It has been used to terminate pregnancy at any stage by promoting uterine contractions and for ripening the cervix before induced labor or abortion. Recently, it is known to reduce postpartum hemorrhage. Very little experience has been reported acute misoprostol toxicity in contrast with its usages. We have experienced a case of acute toxicity of misoprostol used for management of postpartum hemorrhage. We report this case with a review of literatures.
조기진통이 있는 산모에게 투여된 Dexamethasone 1 주기 요법이 산모와 태아의 부신에 미치는 영향
김종필(Jong Pil Kim),임대훈(Dae Hun Lim),김현미(Hyun Mi Kim),김우철(U . Chul Kim),이정례(Jeong Rye Lee),이지영(Ji Young Lee),고승권(Seung Kwon Ko),임문환(Mun Hwan Lim),이우영(Woo Young Lee) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.2
목적 : 본 연구의 목적은 조기분만의 위험성이 있는 임산부에게 투여된 덱사메타손이 산모와 태아의 부신 억제를 야기 시킬 수 있는 지에 대하여 평가하고자 하였다. 연구 방법 : 임신하지 않은 여성 10명을 대상군으로 하여 기초 혈청 코르티솔 수치와 저용량 (1 g) 부신피질자극 호르몬 자극 검사 후 혈청 코르티솔 수치를 측정하였다. 조기진통이 있는 10명의 여성에게 1주 간격으로 저용량 (1 g) 부신피질자극호르몬 자극 검사 시행하였으며, 첫 번째는 입원 시 시행하였다. 처음 저용량 부신피질자극호르몬 자극 검사 후, 덱사메타손 5 mg을 12시간 간격으로 2일간 시행하였다. 혈청 코르티솔 수치는 각각 기초 수치 (부신피질자극호르몬 자극 검사 시행 전)와 자극된 수치 (부신피질자극호르몬 자극 검사 30분 뒤)를 측정하였다. 결과 : 총 대상 환자은 10명이었으며, 모든 환자에서 정상 기초 코르티솔 수치와 자극된 코르티솔 (처음 부신피질자극호르몬 자극 검사 후)를 나타내었다. 부신 억제가 발생한 환자는 총 5명이었고 나머지는 부신 억제가 발생하지 않았다. 부신 억제가 발생된 집단에서는 평균 기초 코르티솔 수치는 덱사메타손 투여 전 38.52 g/dL에서 1주기 덱사메타손 투여 후 1주일 뒤에는 33.26 g/dL로 감소하였다. 또한 부신 억제가 발생된 집단서는 평균 자극된 코르티솔 수치는 덱사메타손 투여 전 46.40 g/dL에서 1주기 덱사메타손 투여 후 1주일 뒤에는 45.02 g/dL로 감소하였다. 결론 : 조기분만의 위험성이 있는 여성에게 1주기의 덱사메타손을 투여 시 다소 부신 기능 억제를 초래할 수 있지만 부신피질 기능저하증은 초래하지 않으며, 태아나 산모의 부신 기능 장애를 야기 시키지는 않을 것이다. Objective : The aim of this study was to determine whether 1 cycle of dexamethasone administration to women at risk of preterm delivery causes adrenal suppression Methods : Nonpregnant ten control subjects were checked baseline cortisol and stimulated cortisol level after low-dose (1 g) ACTH stimulation test. Ten women at risk of preterm delivery had two weekly low-dose (1 g) ACTH stimulation tests with the first one at admission. Immediately after the first ACTH stimulation test, we gave each women a 5 mg dexamethasone dose intramuscularly and repeated it 12 hours later for two days. Serum cortisol levels were measured before (baseline) and 30 minutes after ACTH administration. Results : All ten subjects had normal baseline and stimulated cortisol levels for the first ACTH stimulation test. The adrenal suppressed Group was composed of 5 patients. But the remainders was not suppressed. Mean baseline serum cortisol levels decreased from 38.52 g/dL (before dexamethasone) to 33.26 g/dL (1 week after 1 cycle of dexamethasone) in adrenal suppressed Group. The mean stimulated cortisol levels also decreased from 46.40 g/dL (before dexamethasone) to 45.02 g/dL (1 week after 1 cycle of dexamethasone) in adrenal suppressed Group.Conclusions : Antenatal administration of 1 cycle dexamethasone produced slightly adrenal suppression, but no adrenal insufficiency, in some women at risk of preterm delivery and may be harmless to maternal and fetal adrenal function.
허도행,이은희,정한섭,김우철,Hur, D.H.,Lee, E.H.,Chung, H.S.,Kim, U.C. Korean Nuclear Society 1994 Nuclear Engineering and Technology Vol.26 No.1
원전 증기발생기 2차측 제철 화학세정을 기존의 93$^{\circ}C$ 표준공정보다 고온인 1$25^{\circ}C$에서 검증시험을 수행하였다. 원전 증기발생기를 1$25^{\circ}C$에서 화학 세정한다는 가정아래 현장세정 조건을 결정하고 이를 다시 모사하여 3l 용량의 소형 검증시험 조건을 결정하였다. 1 gallon 용량의 316 스텐레스강 압력용기를 반응용기로 사용하는 화학세정 시험장치에서 검증시험을 수행하여 스러지 용해거동, 모재 부식률, 세정제 화학조성 변화거동 등을 측정하였다. 1$25^{\circ}C$ 검증시험 결과에서 93$^{\circ}C$ 표준공정보다 세정시간을 절반이하로 단축시키고도 더 효율적인 세정효과를 얻을 수 있을 뿐만이 아니라 2차측 모재의 부식률도 감소함을 확인할 수 있었다. 그러나 고온 세정공정은 아직 현장적용 경험이 없고, 별도의 외부순환 세정 장치를 이용하는 93$^{\circ}C$ 표준공정과는 달리 주냉각재의 잠열로 2차측을 가열하므로 세정이 완료될 때까지 주냉각 펌프를 계속 가동하여야 하는 단점이 있다. 가동중인 증기발생기에 대한 화학세정을 수행할 때 93$^{\circ}C$ 표준공정과 고온공정의 장 단점을 신중히 검토하여 최적공정을 적용하여야 할 것이다. A qualification test was performed for the iron removal chemical cleaning of the secondary side of nuclear steam generators at the selected temperature, 1$25^{\circ}C$, higher than the standard application temperature, 93$^{\circ}C$. The field cleaning condition for a nuclear unit was tested in a bench scale test loop including a SUS 316 stainless steel autoclave with one gallon capacity as a test vessel. The kinetics of sludge dissolution, corrosion of the secondary side materials and change of solvent chemistry were monitored. Test results indicated that more thorough cleaning was accomplished in less than half of the cleaning time required at 93$^{\circ}C$. And the total corrosions of the secondary side materials were found to be less than the values at 93$^{\circ}C$. While the solvent is recirculated and heated by an external chemical cleaning equipment for the conventional 93$^{\circ}C$ process, the secondary side is heated by the lateral heat of the primary coolant without the recirculation of the cleaning solution, and the solvent is mixed by vigorous boiling induced by periodic ventilation for the high temperature process. The requirement that the reactor coolant pumps should be running during the cleaning operation is the major disadvantage of the high temperature process which also should be considered when chemical cleaning is planned for steam generators under operation.
백승헌 ( S H Baek ),김우철 ( U C Kim ),심희상 ( H S Shim ),임경수 ( K S Lim ),원창환 ( C H Won ),허도행 ( D H Hur ) 한국부식방식학회(구 한국부식학회) 2014 Corrosion Science and Technology Vol.13 No.2
The purpose of this work is to investigate the effect of dissolved hydrogen concentration on crud deposition onto the fuel cladding surface in the simulated primary environments of a pressurized water reactor. Crud deposition tests were conducted in the dissolved hydrogen concentration range of 5~70 cc/kg at 325℃ for 14 days. Needle-shaped NiO deposits were formed in the hydrogen range of 5~25 cc/kg, while polygonal nickel ferrite deposits were observed at a hydrogen concentration above 35 cc/kg. However, the dissolved hydrogen content seems to have little effect on the amount of crud deposits.
정재훈(Jae-Hoon Chung),김우철(Woochul Kim),이진호(Jinho Lee),류태우(Tae-U Yu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Only around one-third of energy input is utilized as usable energy in most of fuel operating systems. The remainder of 66% of energy is wasted to atmosphere in the form of waste heat. One possible way to improve the efficiency of such systems is to recover waste heat by using thermoelectric generation systems which can directly convert heat into electricity. In the present study, the thermoelectric generation system operating in temperature higher than 200℃ was constructed to simulate and evaluate the thermoelectric waste heat recovery system. Commercially available thermoelectric modules were attached to a stainless steel duct, and a hot air blower was faced to the duct inlet. By controlling the hot air inlet temperature, open circuit voltage of the thermoelectric generation system was measured. The main feature of this study was to use a high temperature condition up to 200℃ to ensure the reliability of the thermoelectric generation system, especially for the case of diesel vehicles which discharge exhaust gas of as high as around 200~300℃ at the outlet of the catalyst filter.