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각종 용매계에서 Poly ( Acrylic Acid ) 와 Poly ( Ethylene Oxide ) 의 착체형성에 관한 점성 연구
허득범,강성원,장춘학,송기원,이장우 ( Deuk Beom Heo,Seong Won Kang,Chun Hag Jang,Ki Won Song,Jang Oo Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.4
수용액 중에서 poly (acrylic acid)(PAA)와 poly (ethylene oxide)(PEO)간의 수소결합을 통한 고분자 착체형성에 있어서 용매 및 외부조건의 변화가 미치는 영향을 모세관점도계 및 전위차계를 사용하여 조사하였다. 수용액의 pH가 낮을수록 PAA의 해리도의 감소로 인하여 착체형성이 더욱 유리하였으며, 물-알코올 혼합용매계에서는 알코올의 영향으로 착체형성의 극대점이 PAA/PEO=1 : 1에서 2 : 3으로 이동하였으며, 착체형성의 정도 또한 감소하였다. 그리고, 물에 요소 및 무기염의 첨가는 소수성상호작용 및 정전상호작용의 결과로 수소결합을 통한 착체형성에 방해요인이 되었음을 점도측정을 통한 고분자의 수력학적 크기의 변화를 통하여 확인하였다. A study on polymer complexation between poly (acrylic acid) (PAA) and poly (ethylene oxide)(PEO) via hydrogen bonding in aqueous media was made under different solvent and surrounding conditions using the Ubbelohde viscometer and pH meter. The lower pH condition of aqueous medium was favorable for complex formation due to the decreased dissociation of the PAA carboxyl groups. In water-ethanol (18wt%) mixed solvent system, the most optimum stoichiometric ratio for complexation was shifted from [PAA]/[PEO]=1 : 1 (in pure water) to 2 : 3 with a fairly weakened complexing ability. The addition of ureas and inorganic salts in water seemed to impede the hydrogen-bonded complexation probably due to the combined effects of hydrophobic and electrostatic interactions involved, as judged from the variation in hydrodynamic dimension of the polymer molecules via (reduced) viscosity measurements in dilute solution.
곽경진 ( Kyoung Jin Kwak ),전현아 ( Hyun Ah Jun ),김홍배 ( Hong Bae Kim ),이근영 ( Keun Young Lee ),강성원 ( Song Won Kang ),유종우 ( Jong Woo Yoo ),박희철 ( Hee Chul Park ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.8
Primary malignant melanoma of the vagina is a very rare disease with incidence of 0.026 per 100,000 women. The opinion of several types of treatment is suggested but the prognosis is extremely poor. Although malignant melanoma is generally regarded as a r
부인과 복강경 수술시 이산화탄소 기복형성 후 트렌델렌버그 자세가 동맥혈 가스 분석과 중대뇌동맥 혈류속도에 미치는 영향
조현진 ( Hyun Jin Cho ),김정식 ( Jung Sik Kim ),이주열 ( Ju Yeul Lee ),전현아 ( Hyun Ah Jun ),김홍배 ( Hong Bae Kim ),이근영 ( Keun Young Lee ),강성원 ( Song Won Kang ),원임수 ( Im Su Won ) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.11
목적: 부인과 복강경 수술은 수술시야를 좋게 하고 기구조작을 하는 공간을 확보하기 위하여 복강 내로 가스 주입과 트렌델렌버그 자세를 유지하게 되는데 이러한 과정은 환자에서 여러 가지 생리적인 변화를 일으킨다. 본 연구는 동맥혈 가스분석과 중대뇌동맥 혈류속도에 미치는 영향을 알아보고자 하였다. 연구 방법: 환자 20명을 대상으로 동맥혈가스분석, 중대뇌동맥 혈류속도, resistance index, pulsatile index를 마취 후 바로 누운 자세에서 Objective: The purpose of this study was to identify arterial acid-balance and cerebral hemodynamics in patients undergoing gynecologic laparoscopic operations according to induction of CO2 pneumoperitoneum and Trendelenburg position. Methods: Twenty pati
김지연 ( Ji Yeon Kim ),이우영 ( Woo Young Lee ),김정만 ( Jung Man Kim ),곽경진 ( Kyoung Jin Kwak ),전현아 ( Hyun Ah Jun ),김홍배 ( Hong Bae Kim ),이근영 ( Keun Young Lee ),강성원 ( Song Won Kang ),원임수 ( Rim Soo Won ) 대한주산의학회 2003 大韓周産醫學會雜誌 Vol.14 No.3
지방간 자체는 위험한 질병이 아니지만 임신 시 동반된 급성 지방간은 갑작스럽게 발생하고 산모 및 태아에게 치명적일 수 있다. 임신 중 급성 지방간은 임신 제 3분기에 나타나며 오심, 구토, 황달, 응고장애 등이 임상적인 특징이다. 이는 간 기능에 영향을 미칠 수 있는 자간전증, HELLP 증후군, 간염에 의한 전격성 간부전, 임신 중 간내 담즙 정체 등과 구별을 요하는데 임상적 특징과 혈액검사 그리고 합병증으로 구분이 가능하며 신속한 진단과 빠른 대처로 산모와 태아의 유병률과 사망률을 낮출 수 있다. 이에 저자들은 본원에서 경험한 임신 중 급성 지방간 1례를 문헌 고찰과 함께 보고하는 바이다. Acute fatty liver of pregnancy(AFLP) is rare, potentially fatal disorder developing in the third trimester of pregnancy. It is characterized by nausea, vomiting, jaundice and malaise. Initially the disease is often mistaken for preeclampsia, HELLP(hemolysis, elevated liver enzymes, low blood platelet count)syndrome, fulminant hepatitis and cholestasis of pregnancy. But acute fatty liver of pregnancy has clinical manifestations, biochemical findings and complications clearly distinguished of HELLP syndrome, fulminant hepatitis and cholestasis of pregnancy. We report a case of pregnancy complicated with fatty liver with brief review of the common causes of acute hepatic failure associated with pregnancy.
질식 자궁경관봉축술을 적용하기 어려운 자궁경관무력증 환자에서 복식 자궁경협부 원주봉합술의 임상적 유용성
박성호(Sung Ho Park),허진숙(Jin Sook Heo),이상헌(Sang Hun Lee),박기한(Ki Han Park),정태범(Tae Bum Choung),전현아(Hyun Ah Jun),김홍배(Hong Bae Kim),이근영(Keun Young Lee),강성원(Song Won Kang) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10
N/A Objective : Our purpose was to review the clinical use of transabdominal cervicoishmic cerclage to determine whether it is a valid alternative to transvaginal cerclage. Study design : A retrospective review was carried out of transabdominal cerclage patients at our hospital from Jan. 1999 to May. 2001. Analysis of the clinical use of transabdominal rather than the vaginal approach in some IIOC patients was performed and fetal outcomes was evaluated. Results : Fifteen patients underwent transabdominal cerclages. The primary indication for transabdominal cervicoisthmic cerclage was failed transvaginal cerclage in 9 patients and anatomic unsuitability for transvaginal cerclage in 6 patients. Follow-up was conducted for all except one patient. All patients were successfully delivered of live babies by Cesarean section. Complications including blood loss requiring transfusion did not occur. However one baby died at postpartal 1 day because of congenital Tetralogy of Fallot. Conclusion : All patients had histories compatible with incompetent cervix requiring cerclage, and none were suitable candidates for vaginal cerclage. Our results and review of the literature confirm that Transabdominal cervicoisthmic cerclage has an important role to play for carefully selected patients.
벤젠의 파과곡선을 이용한 물질전달계수의 측정에 관한 연구
강성원,송헌택,민병훈,서성섭 한국공업화학회 2003 응용화학 Vol.7 No.1
VOCs(voatile organic compounds) have been known as the source of pollution materials of the atmosphere. VOCs related to removal technologies such as emission adsorption, absorption and condensation are developed. Recently developing VOCs removal technologies aer bio filtration membrane separation, UV oxidation Not available VOCs removal technologies for VOCs, adsorption has been widely recognized as an effective means of controlling emissions to the atmosphere and recovering recycle materials from process exhaust streams. Experimental study was carried out for benzene adsorption in an activated carbon bed. As benzene concentration increased, breakthrough time was decreased. This results due to the pressure increasing in the bed and the higher interstitial linear gas velocity. In this experiment, mass transfer coefficient was measured by numerical simulation and cure fitting for experimental data. This dynamic adsorption data and mass transfer coefficient will be for design of adsorption process.