-
About RISS
-
RISS 처음 방문 이세요?
-
고객센터
-
RISS 활용도 분석
-
최신/인기 학술자료
-
해외자료신청(E-DDS)
-
RISS API 센터
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 전재훈 (검색결과 226 건)
- 무료
- 기관 내 무료
- 유료
-
-
-
전재훈,김지원,권유리,엄광문,고성범,이봉수,김형식,이정한,탁계래 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
The purpose of this study is to develop a more convenient system for measurement of hand rotation, and to validate the system by correlation of performance indices derived from the system with the bradykinesia score of hand rotation movement during on-medication state. Forty patients with Parkinson's disease and 14 age-matched control subjects participated in this study. The measurement system was developed using a ceramic gyroscope that is significantly smaller and lighter than those in the literature. The sensor signal was bandpass filtered and action tremor was eliminated by additional lowpass filtering (fc=5Hz) with automated tremor discrimination. Four performance indices (RMS velocity and RMS angle, peak power and total power) were derived from the angular velocity signal. Correlations of performance indices with clinical scores and difference of performance indices among subject groups were investigated. Correlations of all performance indices were far better with bradykinesia score of hand rotation (best r=-.78) than with the other categorized subscores of UPDRS (bradykinesia subscore, axial symptom subscore, and total motor score; best r=-.64). Elimination of action tremor resulted in improvement in correlations of RMS velocity and total power with bradykinesia score for hand rotation (r=-.84 from -.81). Differences between low scores were greater in total power and differences between high scores were greater in RMS velocity, suggesting that use of more than one PI would be beneficial for diagnosis of a wide range of patients. The convenient sensor system, action tremor elimination, and performance indices suggested in this study are expected to be useful in clinical situations.
-
-
-
-
-
Zero Voltage Switching을 이용한 저전압 DC/DC 컨버터의 고집적회로 설계
전재훈,김종태,홍병유 전력전자학회 2001 전력전자학회 논문지 Vol.6 No.6
본 논문은 휴대용 기기를 위한 고효율의 저전압용 DC/DC 컨버터의 고집적회로에 관한 연구이다. 컨버터의 모든 능동 소자들은 0.65$\mu\textrm{m}$표준 CMOS 공정을 사용하여 단일 칩으로 구현하였다 수종 소자들의 크기를 줄이기 위해서 1MHz의 주파수에서 동작하며 높은 주파수에서 의스위칭 손실을 최소화하기 위하여 ZVS 방식으로 설계하였다. 시뮬레이션 결과 출력 전압이 2V일때 1W의 출력을 가지며 full 부하에서 95%의 효율을 보였다. This paper presents the VLSI design of highly efficient low voltage DC/DC converter for portable devices. All active devices are integrated on a single chip using a standard 0.65$\mu\textrm{m}$ CMOS process. The converter operates at the switching frequency of 1MHz for reducing the size of passive elements and uses a ZVS for minimizing the switching loss at high frequency. Simulation results show that the circuit can achieve a 95% efficiency when the output voltage is controlled to be 2V with the load of lW.
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
