http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박형렬,여재진,노정진,Park, Hyung-Ryul,Yeo, Jae-Jin,Roh, JeongJin 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.4
This paper presents the design of dual mode boost converter for energy harvesting. The designed converter boosts low voltage from energy harvester through a startup circuit. When the voltage goes above predefined value, supplied voltage to startup circuit is blocked by voltage detector. Boost controller makes the boosted voltage into $V_{OUT}$. The proposed circuit consists of oscillator for charge pump, charge pump, pulse generator, voltage detector, and boost controller. The proposed converter is designed and fabricated using a $0.18{\mu}m$ CMOS process. The designed circuit shows that minimum input voltage is 600mV, output is 3V and startup time is 20ms. The boost converter achieves 47% efficiency at a load current of 3mA. 본 논문은 에너지 하베스팅용 이중 모드 부스트 컨버터 설계에 관한 것이다. 설계된 회로는 에너지 하베스팅에 의해 출력된 작은 전압으로부터 startup 회로를 통해 승압된 전압을 얻는다. 이 전압이 일정 전압 이상이 되면, 전압 감지기에 의해 startup 회로에 공급되는 전압이 차단이 된다. 승압된 전압은 부스트 컨트롤러에 의해 최종적으로 $V_{OUT}$이 된다. 회로는 크게 전하 펌프를 위한 오실레이터, 전하 펌프, 펄스 생성기, 전압 감지기, 부스트 컨트롤러로 구성되어있다. 매그나칩 / SK하이닉스의 $0.18{\mu}m$ CMOS 공정을 사용하였다. 설계된 회로는 테스트 결과 최소 입력 전압은 600mV이며, 출력은 3V이고, startup time은 20ms이다. 제작된 부스트 컨버터의 효율은 load current가 3mA일때, 47%로 측정되었다.
요골접근법에 의한 관상동맥 스텐트 시술의 가능성과 안정성
차광수(Kwang Soo Cha),김무현(Moo Hyun Kim),김혜진(Hye Jin Kim),양두경(Doo Kyung Yang),조정환(Jeong Whan Cho),박태호(Tae Ho Park),박형렬(Hyung Ryul Park),김봉근(Bong Keun Kim),김영대(Young Dae Kim),김종성(Jong Seong Kim) 대한내과학회 1999 대한내과학회지 Vol.56 No.2
Objectives : Powerful anticoagulant and antiplatelet therapies after coronary stenting may carry the risk of increased bleeding complications if large-bore guiding catheters are introduced via the femoral artery. Recently smaller radial artery is introduced as an entry site for coronary interventions owing to miniaturization of equipments, easy hemostasis and lower access site complications, and little hand ischemia. The purpose of this study is to evaluate the feasibility and safety of coronary stent implantation via the radial artery. Methods : After a learning curve for transradial diagnostic coronary angiography, stent implantation was attempted in 131 consecutive patients, 135 lesions. Immediately after procedure, the introducer sheath was withdrawn and mobilization was initiated. Clinical follow-up was done for punctured radial arteries. Results : Procedural success and uncomplicated clinical course was achieved in 129(98%) patients, 133(99%) lesions. No stent embolization or migration within the coronary artery, and no procedure-related death, Q wave myocardial infarction or emergent bypass surgery were happened. No stroke or severe arm vessel complications were happened except 4(3%) cases of moderate hematoma. Failed 2 cases were in early period and stents did not pass the lesions due to inappropriate selection and poor backup of guiding catheters. During follow-up of 124±36 days, punctured radial arteries showed weak or absent radial pulse in 10(7%) patients, but no claudication or ischemia of hand was observed. Conclusion : Transradial coronary stenting was performed safely with high success rate and low complication rate. This study supports that transradial approach is a promising primary route for coronary stenting.