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OLED 발광재료의 합성에서의 커플링 반응 기술 (Coupling reaction technology in the OLED emitting material synthesis)
서성우,박남진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
현재 디스플레이 시장은 이전 LCD가 주류를 이루고 있는 시장에서 차세대 기술인 OLED로 빠르게 변화하고 있다. 적용분야도 스마트폰, TV 뿐만 아니라 다양한 산업에 적용되고 있다. 현재 OLED의 95% 이상이 한국에서 공급하고 있으며, 중소형 OLED 시장은 삼성디스플레이가, 대형 OLED 시장은 LG디스플레이가 선도하고 있다. 이렇게 디스플레이의 적용 범위가 넓어짐에 따라 OLED용 저분자 유기 EL 재료의 수요 또한 급증하고 있으며, 따라서 해당 재료의 합성 기술이 더욱 중요해지고 있다. 본 발표에서는 OLED에 사용되는 유기 EL 재료에 대한 전반적인 소개와 재료의 특성을 알아보고 그에 따른 다양한 합성 기술에 대하여 소개하고자 한다. OLED 소재 합성에 주로 사용하는 반응에는 C-C bond formation : Suzuki Reaction, C-N bond formation : Buchwald-Hartwig Reaction, Ullmann Reaction, Carbazole synthesis : Cyclodehydrogenation of diarylamines, Cadogan synthesis, Borylation, Halogenation 등이 사용된다.
서성우,김한규,문재곤,황용순,이화동 대한신경외과학회 1993 Journal of Korean neurosurgical society Vol.22 No.10
Postoperative brain edema and/or hemorrhage is a serious problem especially arteriovenous malformations(AVM) in an eloquent area. It has been a neurosurgical dilemma whether to surgically remove an unruptured AVM in an eloquent area. It is necessary to define the anatomic location, understand the hemodynamics, vasoreactivity of the adjacent brain parenchyme for safe removal of an AVM in an eloquent area. A successful removal of an AVM at an eloquent motor area without neurological deficit was made. We report method of localization, angiographic anatomy, mechanism of possible hemodynamic insult related to operation.
황색포도알균이 가장 흔한 원인인 우리나라 4개 대학병원의 감염성심내막염의 특징
서성우,김태형,현민수,추은주,전민혁,문철,송단,김종화,이용관,최종효,전웅,조영신,최문한 대한감염학회 2008 Infection and Chemotherapy Vol.40 No.6
Background : To evaluate whether Staphylococcus aureus is actually the leading cause of infective endocarditis in Korea, investigation on updated clinical pictures, treatments, and prognosis was performed. This study also aims to describe differences in clinical characteristics of infective endocarditis in patients undergoing maintenance hemodialysis. Materials and Methods : Fifty five patients who were diagnosed with infective endocarditis, using modified Duke criteria, at 4 Soon Chun Hyang University Hospitals (located in Seoul, Bucheon, Cheonan, and Gumi) from January of 2000 to June of 2007 were enrolled. Patients were separated into two groups; those on hemodialysis and those who were not on hemodialysis (control group). Medical records and laboratory results of each patient were reviewed retrospectively. Results : The positive rate of blood culture was 72.7%. Staphylococcus aureus was isolated in 38.2% of the patients, making it the most common causative organism of infective endocarditis. It was also the most common organism in both hemodialysis group and non-hemodialysis group. Six patients (10.9%) died while admitted to the hospital and the in-hospital death rate for hemodialysis group was significantly higher. Conclusion : In most parts of the world, S. aureus is increasingly becoming the principal causative organism of infective endocarditis. To our knowledge, this is the first study that shows S. aureus to be the most common causative organism of infective endocarditis in Korea, and that Korea is not except from this global epidemiology. Background : To evaluate whether Staphylococcus aureus is actually the leading cause of infective endocarditis in Korea, investigation on updated clinical pictures, treatments, and prognosis was performed. This study also aims to describe differences in clinical characteristics of infective endocarditis in patients undergoing maintenance hemodialysis. Materials and Methods : Fifty five patients who were diagnosed with infective endocarditis, using modified Duke criteria, at 4 Soon Chun Hyang University Hospitals (located in Seoul, Bucheon, Cheonan, and Gumi) from January of 2000 to June of 2007 were enrolled. Patients were separated into two groups; those on hemodialysis and those who were not on hemodialysis (control group). Medical records and laboratory results of each patient were reviewed retrospectively. Results : The positive rate of blood culture was 72.7%. Staphylococcus aureus was isolated in 38.2% of the patients, making it the most common causative organism of infective endocarditis. It was also the most common organism in both hemodialysis group and non-hemodialysis group. Six patients (10.9%) died while admitted to the hospital and the in-hospital death rate for hemodialysis group was significantly higher. Conclusion : In most parts of the world, S. aureus is increasingly becoming the principal causative organism of infective endocarditis. To our knowledge, this is the first study that shows S. aureus to be the most common causative organism of infective endocarditis in Korea, and that Korea is not except from this global epidemiology.