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김성우,최우창,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and DMA gas concentration. The ZnO-based thin film sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3) and V_(2)O_(5) and sputtered in oxygen atmosphere showed the maximum sensitivity of 218(working temperature, 250 ℃, DMA gas, 160 ppm) and speedy response time. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3), TiO_(2) and V_(2)O_(5), sputtered in oxygen atmosphere and aged at 330 ℃ showed the maximum sensitivity of 156(working temperature, 250 ℃, DMA gas, 160 ppm).
DMA 가스 검지를 위한 ZnO 박막의 aging 효과
김성우,최혁환,이명교,권태하 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. The characteristics of the sensors to aging conditions were investicated. The sensors with ZnO-based thin films aged for 72hrs at a temperature of 330 ℃ in oxygen showed high sensitivity, low working temperature and good linearity. The sensors with ZnO-based thin film doped with 0.1 wt.% Pt catalytics and aged for 72hrs at a temperature of 330 ℃ in oxygen showed the maximum sensitivity of 90 at a working temperature of 150 ℃ and to DMA gas of 160 ppm. The sensor was electrically stablized.
박성현,최우창,김성우,류지열,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The microheaters with Si_(3)N_(4)(1500Å)/SiO_(2)(3000Å)/Si_(3)N_(4)( 1500Å) diaphragm were fabricated by thin film technology and silicon micromachining techniques. Pt and poly-Si(n+) materials were used as heater materials of microheater. Pt temperature sensor was fabricated to detect the temperature of microheaters. The thermal analysis including temperature distribution on diaphragm and power consumption of the microheater were executed by the FEM method and heat transfer equations. The power consumption of the Pt and poly-Si(n+) heaters were measured and compared to that of thermal analysis by FEM simulation.
최우창,김성우,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The ammonia gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and ammonia gas concentration. The sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The Au(0.3 wt.%) doped-ZnO thin film sensors aged at 330 ℃ showed the maximum sensitivity of 28 and good response time at a working temperature of 250 ℃ and to 160 ppm ammonia gas. The Pt(0.1 wt.%) doped-ZnO thin film sensors showed the maximum sensitivity at a low working temperature of 200 ℃.
미얀마에서 유입된 뎅기쇽 증후군(Dengue Shock Syndrome) 1례
문성용,노영준,김종혁,김지연,김진건,김현우,이정훈,남상민 대한감염학회 2003 감염과 화학요법 Vol.35 No.4
저자들은 미얀마에서 현지 상사원 부인으로 2년간 거주 중 발병한 뎅기쇽 증후군 1예를 경험하였다. 환자는 내원 6일전부터 발열, 오한, 전신쇠약, 근육통, 오심 등의 증상이 있었으나 치료를 지연하다가 귀국하였으며 환자는 내원당시 점상 출혈 및 쇼크를 보였고 적절한 수액요법 등을 시행하였으나 내원 2일째 사망하였다. 환자는 국립보건원에 의뢰한 뎅기바이러스에 대한 IgM antibody capture ELISA 검사에서 양성반응을 보여 뎅기쇽 증후군으로 확진되었다. Dengue fever/dengue shock syndrome is an acute febrile illness caused by a Flaviviridae virus. Dengue virus infection can cause a wide spectrum of illness, and disease is characterized by sudden onset of high fever, chill, severe headache, skin rash, general malaise and thrombocytopenia with hemoconcentration. Dengue fever is endemic in most tropical areas of world, including the Caribbean, Central and South America, Africa, and Southeast Asia. Tourists to these areas are liable to infection. We experienced a Korean female who returned to Korea from Myanmar in severely ill state. She was confirmed serologically to be inblieted with Dengue shock syndrome. In spite of intensive medical care, she died of Dengue shock syndrome. We emphasize that favorable prognosis depends mainly on the early recognition and treatment of shock.
궤양성 대장염 치료 중 합병된 거대세포바이러스 대장염 1예
김성국,정준모,최용환,권혁만,이창형,김영탁,조제현,권영오 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.4
Cytomegalovirus colitis has been reported infrequently in patients with underlying inflammatory bowel disease, and usually in those who are taking corticosteroid drugs. It has been implicated as a possible exacerbating factor of ulcerative colitis. We experienced a case of cytomegalovirus colitis developed in patient with ulcerative colitis during corticosteroid therapy. So we report the case with a brief review of literatures.
김성국,조재현,정준모,최용환,권영오,탁원영,김영탁,권혁만 대한소화기학회 1998 대한소화기학회지 Vol.31 No.4
Abdominal actinomycosis is often difficult to diagnose before operation because of no reliable clinical features and relative infrequency of the diasease. The diagnosis is usually made during exploratory laparotomy by staining and culture of Actinomyces israelii or histologic demonstration of sulfur granules in pus from fistulae or surgically resectes specimen. Treatment consists of surgical resection of infected lesion and long-term antibiotic therapy. We report a case of abdominal actinornycosis suggesting periappendiceal abscess, mesenteric tuberculosis or retroperitoneal tumor preoperatively.
김성국,정준모,최용환,김영탁,권영오,권혁만,금민수,이창형 대한간학회 1997 Clinical and Molecular Hepatology(대한간학회지) Vol.3 No.1
Portal vein occlusion has previously been considered as a contraindication for TIPS placement. Several recent reports have suggested that placement of TIPS may be effective in patients with occluded portal veins to embolize varices and recanalize venous obstruction. We experienced a case of variceal bleeding associated with portal vein thrombosis who was success- fully treated with TIPS placement. So we report the case with a brief review of literatures.