http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오동주,염기수,Oh Dong-joo,Yeom Kee-soo 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.8
본 논문에서는 차세대 RF 전력 소자로 기대하고 있는 LDMOST의 BV(Breakdown; 항복전압) 특성을 향상시키는 새로운 구조를 제안하였다. 제안한 구조는 외부 전계 링이라 하며 드리프트 영역 둘레에 3차원적인 구조로 형성된다. 외부 전계 링은 드리프트 영역에서 전계를 완화시키는 역할을 함으로써 BV 특성을 향상시키는 효과를 얻을 수 있다. 3차원 TCAD 시뮬레이션 결과, 외부 전계 링의 접합깊이와 도핑 농도의 증가에 따라 LDMOST의 BV가 증가함을 확인할 수 있었다. 따라서 기존의 p+ sinker 공정을 사용하여 외부 전계 링 구조를 추가한다면 LDMOST의 BV 특성을 크게 향상 시킬 수 있다. In this paper, we have proposed a new structure of LDMOST, which has been expected as a next generation RF power device, to improve the BV(Breakdown Voltage) characteristics. The proposed structure, named external field ring, is formed around a drift region by the three dimensional structure. The external field ring relieves the electric field in the drift region and improves the BV characteristics. By the three dimensional TCAD simulations, it was found that the BV of LDMOST was increased by the increase of the junction depth and doping concentration of the external field ring. Therefore, the BV characteristics of the LDMOST can be remarkably improved by addition of external field ring using an existing p+ sinker process.
고농도 Dipyridamole 심초음파를 이용한 관상동맥 질환의 진단
심완주(Wan Joo Shim),서홍석(Hong Seog Seo),안태훈(Tae Hoon Ahn),김영훈(Young Hoon Kim),오동주(Dong Joo Oh),박정의(Jeong Euy Park),노영무(Young Moo Ro) 대한내과학회 1992 대한내과학회지 Vol.43 No.5
N/A Background: Dipyridamole infusion induces myocardial ischemia in the presence of coronary artery stenosis. Regional wall motion abnormality detected by 2-dimensionai echocardiography (2DE) is a reliable sign of mycoardial ischemia. Method: Dipyridamole of 0.56mg/kg was infused over the 4 minutes and followed by 4 minutes of no infusion and then 0.28mg/kg of dipyridamole infusion during 2 minutes in 31 patients. At the baseline, full 2DE was recorded and continuous 2DE was performed during the dipyridamole infusion and 10 minutes thereafter. Blood pressure was measured every 1 minute and ECG was checked at baseline, 4 minutes 10 minutes and at the end of the study. Coronary angiography wa done in all cases within 2 minths of dipyridamole echocardiography. Result: As a criteria of myocardial ischemia, 4 parameters such as emergence of chest pain, ischemic ST change in ECG, reduction of ejection fraction and development of new abnormal regional wall motion was analysed. The sensitvity for each parameter was 52,9%, 72.2%, 77.8% and 83.3% respectively. The specificity was 100% for abnormal regional wall motion, 91.7% for reduction of ejection fraction, 76,9% for ischemic ST change and 53.8% for chest pain. No serious side effect was observed during the procedure. Comclusion: Thus we conclude high dose dipyridamole echocardiography is a safe and useful method to detect coronary artery disease especially who is unable to exercise
변형 협심증에서 운동부하검사 , Thallium - 201 심근관류검사 및 Holter 심전도 검사의 다양성
최석주(Seok Joo Choi),서홍석(Hong Seok Suh),오동주(Dong Joo Oh),박정의(Jeong Euy Park),노영무(Young Moo Ro) 대한내과학회 1989 대한내과학회지 Vol.36 No.3
N/A Variant angina is defined as angina occurring at rest with reversible ST-segment elevation of the ECG. However, the underlying coronary pathology of variant angina can be either a spasm of the coronary artery with fixed stenosis or a spasm of the normal coronary artery. Therefore, the clinical or laboratory features of variant angina may vary according to the underlying coronary pathology. In an attempt to investigate the features of the exercise stress test, Thallium-201 myocardial perfusion scintigraphy (MPS) and Holter ECG monitoring in 14 patients with variant angina were studied. The exercise stress test was positive in 57.1% of patients and negative in 42.9%. There was no relationship between the degree of ST-segment depression and the frequency and severity of attacks of chest pain at rest. Thallium-201 MPS showed reversible perfusion defects in 71.4%. The locations of the perfusion defects were anteroseptal (20%), anterolateral (20%), septal (10%), apical (10%), posterolateral (20%) and inferior walls (20%). Both the exercise stress test and Thallium-201 MPS were positive in 57.1% of patients, which favors the presence of exercise-induced myocardial ischemia due to fixed coronary artery disease. The exercise stress test and Thallium-201 MPS were both negative in 28.6%, and only the Thallium-201 MPS was positive in 14.3%. The Holter ECG during attacks of chest pain at rest showed ventricular tachycardia in 14.3%. The concordance rate of the Holter ECG lead of ST-segment elevation during the attacks of chest pain at rest with the location of the Thallium-201 MPS perfusion defect was 70%, and the discordance rate was 30%. In conclusion, the findings we observed in a limited patient series showed that there was diversity in the features of the exercise stress test and Thallium-201 MPS in patients with variant angina. These results seem to favor the coexistence of fixed coronary artery disease and spasm in a considerable proportion of patients with variant angina.