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완전-차동형 CMOS OTA들을 이용한 시뮬레이티드 플로팅 인덕터의 설계 및 응용
신희종,정원섭,Shin, Hee-Jong,Chung, Won-Sup 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.1
두 개의 완전-차동형 OTA들과 하나의 커패시터를 이용한 시뮬레이티드 플로팅 인덕터를 제안했다. 제안한 플로팅 인덕터의 동작 원리를 기술했고, 실험 결과들을 제시했다. 실험 결과들은 이론적인 예측과 실험적인 성능이 잘 일치한다는 것을 보였고, 제안한 플로팅 인덕터가 기존의 인덕터들보다 약 두 배 큰 Q 인수를 가진다는 것을 보였다. 제안한 인덕터의 3차 일립틱 저역-통과 여파기에 응용 역시 제시하였다. A simulated floating inductor using two fully-differential OTA's and a capacitor is presented. The theory of operation is described and experimental results are used to verify theoretical predictions. The results show close agreement between predicted behavior and experimental performance. The proposed floating inductor has about two times higher Q factor than conventional designs. The application of the inductor to a ladder type third order ellitic low pass filer is also presented.
저전압 저전력 바이폴라 선형 트랜스컨덕터와 이를 이용한 OTA에 관한 연구
신희종,정원섭,Shin, Hee-Jong,Chung, Won-Sup 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.1
저전압 저전력 신호 처리를 위한 새로운 바이폴라 선형 트랜스컨덕터와 이것을 이용한 연산 트랜스컨덕턴스 증폭기를 제안한다. 이 트랜스컨덕터는 이미터 디제네레이션 저항을 갖는 npn 차동쌍과 이 차동쌍에 직렬로 연결된 pnp 차동쌍으로 구성된다. 이 구성에서 넓은 선형성과 온도 안정성을 위해 pnp 차동쌍의 바이어스 전류는 npn 차동쌍의 출력 전류를 사용하고 있다. 제안한 OTA는 선형 트랜스컨덕터와 세 개의 전류 미러를 갖는 트랜스리니어 전류 셀로 구성된다. 제안된 트랜스컨덕터는 종래의 그것과 비교하였을 때 우수한 선형성과 저전압 저전력 특성을 갖는다. 실험 결과, 50 ${\mu}S$의 트랜스컨덕턴스를 갖는 트랜스컨덕턴스가 공급 전압 ${\pm}$3V에서 입력 전압 범위가 -2V에서 +2V 사이에 ${\pm}$0.06% 보다 작은 선형 오차를 갖는다. 전력 소비는 2.44 mW이다. 25 ${\mu}S$의 트랜스컨덕턴스를 갖는 OTA 시작품을 바이폴라 트렌지스터 어레이를 가지고 만들었다. OTA의 선형성은 제안한 트랜스컨덕터와 같다. OTA 회로는 또한 0.5 S/A의 감도로 바이어스 전류 변화에따라 4-디케이드(decade)에 걸쳐서 선형적인 트랜스컨덕턴스를 갖는다. 1A novel bipolar linear transconductor and its application to operational transconductance amplifier(OTA) for low-voltage low-power signal processing is proposed. The transconductor consists of a npn differential-pair with emitter degeneration resistor and a pnp differential-pair connected to the npn differential-pair in cascade. The bias current of the pnp differential-pair is used with the output current of the npn differential-pair for wide linearity and temperature stability. The OTA consists of the linear transconductor and a translinear current cell followed by three current mirrors. The proposed transconductor has superior linearity and low-voltage low-power characteristics when compared with the conventional transconductor. The experimental results show that the transconductor with transconductance of 50 ${\mu}S$ has a linearity error of less than ${\pm}$0.06% over an input voltage range from -2V to +2V at supply voltage ${\pm}$3V. Power dissipation of the transconductor was 2.44 mW. A prototype OTA with a transconductance of 25 ${\mu}S$ has been built with bipolar transistor array. The linearity of the OTA was same as the proposed transconductor. The OTA circuit also exhibits a transconductance that is linearly dependent on a bias current varying over four decades with a sensitivity of 0.5 S/A.
가미귀비탕(加味歸脾湯)으로 호전된 갱년기(更年期) 증후군(症候群) 환자 치험 1례
신희종 ( Hee Jong Shin ),유동열 ( Dong Youl Yoo ) 대전대학교 한의학연구소 2011 혜화의학회지 Vol.20 No.1
Purpose: This paper is aimed to report the effects of Gamiguibitang on the Climacteric Syndrome. Methods: A patient who had been suffering from Climacteric symptoms was enrolled in this study. She received oriental treatment such as herbal medicine for 3 months. We gave her Gamiguibitang five times. During the treatments, we requested her to visit hospital twice a week. If she could not come to hospital, we called her to take follow-up. Results: After oriental medical treatments, several symptoms of Climacteric Syndrome were improved. Conclusion: This clinical case indicate that Gamiguibitang is effective in treatment of the Climacteric Syndrome. More clinical data and studies are requested for the treatment of Climacteric Syndrome Patient.
임플란트 2차 수술 시 porcine collagen matrix 이식을동반한 근단변위판막술의 임상적 평가 증례보고
신희종 ( Hee Jong Shin ),이원표 ( Won Pyo Lee ),정명진 ( Ming Zhen Zheng ),송현종 ( Hyun Jong Song ),유상준 ( Sang Joun Yu ),김병옥 ( Byung Ock Kim ) 조선대학교 치의학연구원 2014 Oral Biology Research (Oral Biol Res) Vol.38 No.1
The significance of keratinized mucosa in implant maintenance is a controversial issue. As such, there is no consensus regarding the relationship between the width of keratinized mucosa and the health of peri-implant tissue. However, clinicians prefer to provide enough keratinized mucosa around implants for long-term implant maintenance and stabilization of the gingival margin position. The purpose of this case report is the clinical evaluation of an apically positioned flap with a porcine collagen matrix to provide keratinized mucosa and deepen the vestibule around implants during second stage implant surgery. In this case report, a clinically relevant amount of keratinized mucosa was achieved around implants and the vestibule was deepened. Thus, an apically positioned flap with a porcine collagen matrix is an available technique for providing keratinized mucosa and deepening the vestibule around implants during second stage implant surgery. This technique could be potentially used in routine autogenous or another graft procedures to provide keratinized mucosa around implants.