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조형문(Hyung-mun Cho),조성남(Sungnam Cho),김병국(Byeong-guk Kim),최영하(Youngha Choi),윤석주(Suckju Yoon),한종규(Jongkyu Han) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This paper presents the effects of equivalence ratio on the performance of a small spark-ignited gasoline engine. The engine used in this test was a single cylinder, two-stroke, air-cooled 26CC engine for lawn mower. The rpm, torque, power, and fuel consumption were measured under the four different equivalence ratio conditions and the engine loads respectively. In addition, the difference of the rpm on the dynamometer and the engine was confirmed to verify the effect of clutch by using for transfer the engine power. The results showed that the maximum power and minimum fuel consumption could be obtained at =0.9 and 9% load of dynamometer and clutch effect such as the slip on the λ surface was not concerned.
최영하(Youngha Choi),조성남(Sungnam Cho),김병국(Byeongguk Kim),조형문(Hyungmun Cho),윤석주(Suckju Yoon),한종규(Jongkyu Han) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the effects of equivalence ratios and throttle open degrees on the emission and performance of a small spark-ignition gasoline engine. The engine used in this paper was a single cylinder, diaphragm carburetor, two-stroke, air-cooled 26㏄ engine for brush cutter. The rpm, torque, fuel consumption and CO emission were measured under the four different equivalence ratio and three different throttle degree conditions on the engine loads respectively. In addition, the difference of the rpm on the dynamometer and the engine was confirmed to verify the effect of clutch by using for transfer the engine power. The results showed that the maximum power and minimum fuel consumption could be obtained at λ=0.9 and 9% load of dynamometer, and also the leaner mixture tuning develops the lower CO emission.
신귀수(Gwisu Shin),조성남(Sungnam Cho),류신열(Shinyeol Ryu),김근주(Keunjoo Kim) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The high-voltage discharging filter was designed for the purification of the exhaust gases in automobile. The filter was located on the exhaust line after catalyst and front of a muffler. The electric power 3.6 W with the voltage of 12 V and the current of 300 mA was applied and the voltage was transformed to 5 KV. The experimental measurement of smoke density was performed by the implement of the truck named. "Galloper". a product of Hyundai Motor Co at the engine speed of 2000 rpm. The smoke opacity in optical absorption measurement was reduced from 4 to 3% by the operation of the discharge filter.<br/> <br/>
메스암페타민 의존 환자에서 바이오피드백 훈련의 효과 : 정량화 뇌파를 이용한 예비연구
박창교(Changkyo Park),권도훈(Dohoon Kwon),조성남(Sungnam Cho),김양태(Yangtae Kim),김기성(Kiseong Kim),조수현(Soohyun Joe) 한국중독정신의학회 2012 중독정신의학 Vol.16 No.2
Objectives : In this study, authors investigated the neurophysiological effect of biofeedback training in patients with meth-amphetamine dependence using quantitative EEG (qEEG). Methods : Methamphetamine-dependent patients willing to receive biofeedback therapy were recruited in an addiction ward. qEEG measurements were conducted before and after each training session. Theta (4-8 Hz) relative power was measured and com-pared before and after biofeedback qEEG of each session. Results : A total of 49 pairs of relative power before and after bio-feedback qEEGs were obtained from 11 subjects with methamphetamine dependence. The right temporal theta relative power showed a significant decrease after biofeedback training. The right frontal theta relative power in the early biofeedback train-ing sessions showed a significant decrease compared with the later training sessions. Additionally, the right temporal theta relative power after the last-biofeedback training session also showed a significant decrease compared with the biofeedback before the first training session. Conclusion : These results suggested that the application of biofeedback training program changed brain waves and thus, could be a useful method of treat-ment for methamphetamine dependence.
OAI, OpenURL 기반 개방형 학술정보 유통 아키텍처 설계 및 구현
이상기(Sanggi Lee),최성원(Seongwon Choi),조성남(Sungnam Cho),전성진(Sungjin Jhun),최진영(JinYoung Choi),정택영(Taikyeong Chung) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
상업출판사에 의한 학술정보의 무기화 및 독점화로 학술정보 유통이 일대 위기를 맞고 있는 가운데 누구나 자유롭게 학술정보를 이용하자는 운동이 활발하다. 이를 기술적 표준적으로 지원하기 위해 결성된 OAI에서는 OAI 아키텍처와 표준 프로토콜을 개발하였다. OAI는 프로토콜 표준화를 통해 메타데이터의 상호운용성은 크게 증진하였으나, 메타데이터와 전자원문 간 연계를 간과함으로써 정보자원 간 연계가 취약한 맹점이 있다. 본 논문에서는 OAI 아키텍처의 메타데이터와 전자원문 간 연계성을 개선하고 유사 자원으로의 확장성을 제공하기 위해, 국제표준 프레임워크인 OpenURL을 접맥한 개방형 학술정보 유통 아키텍처를 설계 및 구현하였다. 이를 통해 분산 환경에서의 정보자원 간 상호운용성 및 유사자원으로의 확장성을 제고하였다.