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RISS 인기검색어
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- 저자 : 박동훈(Park Dong-Hoon) (검색결과 44 건)
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근거리 무선 전력 전송을 위한 평형 증폭기 구조의 10MHz 10W급 전력원 설계
박동훈(Dong-Hoon Park),김귀성(Gui-Sung Kim),임은천(Eun-Cheon Lim),박혜미(Hye-Mi Park),이문규(Moon-Que Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
In this paper, we have designed and manufactured 10MHz power source for the application of short distance wireless power transmission. The designed power source consists of a DDS(direct digital synthesizer) signal generator, a buffer driver and a balanced power amplifier. Short range wireless power transmission is usually carried out by near-field inductive coupling between source and load. The distance variation between source and load gives rise to the change of load impedance of power amplifier, which has effect on the operation of power amplifier. To overcome this problem due to load variation of power amplifier, we have adopted the balanced power amplifier using the quadrature hybrid implemented by lumped capacitors and a mutually coupled coil. The experiment results show the above 40dBm output power, frequency range of 9 to 11MHz, and total DC power consumption of 36W.
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슬관절 굴곡력강화운동프로그램 적용에 따른 인라인 롤러스피드스케이팅 선수의 슬관절 근기능 변화
박동훈(Park, Dong-Hoon),장지훈(Jang, Jee-Hun),유호(Yoo, Ho),정태상(Jung, Tae-Sang) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.1
The purpose of this study was to identify the changes of muscular function in the knee joint after application of knee flexor strengthening program(KFSP) during 12-week-winter training period, and to present the basal data for development of muscular strengthening program for prevention of injury and improvement of athletic performance. Participants were 15 male in-line roller speed skaters, and assigned to middle school group(MI, n-S) and university group(UN, n=7). KFSP was applied to both groups for 12 weeks, 4 times per week, 23~36 minutes per day. Muscular function in the knee joint was repeatedly measured with isokinetic dynamometer before and after application of KFSP. As a result, all muscle strength and power related variables except dominant-side flexion peak torque were tended to be decreased in MI. In UN, all muscle strength and power related variables were tended to be increased. Dominant-side flexion peak torque and average power, and dominant-side ipsilateral balance ratio were significantly increased(p<.01) in post-test. All muscle endurance related variables in both groups showed the positive changing tendency. Dominant-side extension and flexion fatigue index were significantly decreased(P<.05) in post-test. In conclusion, KFSP in this study was effective in the improvement of muscular function and ipsilateral balance ratio in UN. And it is suggested that KFSP after puberty should be more effective than that during puberty. Ipsilateral balance ratio in pre-test suggested that intervention program for prevention of sports injury in in-line roller speed skaters should be introduced.
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박동훈(Dong-Hoon Park),최명진(Myung-Jin Choi) Korean Society for Precision Engineering 2003 한국정밀공학회지 Vol.20 No.5
An Amplitude Proportional Friction Damper (APFD) is considered in order to improve the characteristics of Coulomb friction damper. The frictional force is proportional to the amplitude in APFD system and the system is non-linear as is Coulomb damper system. A free vibration analysis on the 1-DOF system has made to demonstrate the characteristics of the APFD system. The results show that APFD system has similar damping characteristics to the viscous damper. Also, the solution for the response of a base-excited system with APFD is developed through the application of a Fourier series to represent the frictional force of APFD. It is assumed that no stick-slips occur during any portion of the steady-state oscillation.
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박동훈(Dong-Hoon Park),노성찬(Sung-Chan Rho),유광균(Kwang-Kiun Yoo) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
열차의 위치를 파악하기 위한 궤도회로는 궤도구간을 일정한 간격으로 분할하고 있다. 이렇게 궤도구간을 분할하는 방식으로는 레일을 절단하고 중간에 레일절연을 설치하는 유절연 궤도회로와 전기적으로 전류를 차단하여 분할하는 무절연 궤도회로가 있다. 전기적으로 분리하는 무절연 궤도회로 방식은 궤도경계가 유절연 궤도회로 방식보다는 명확히 분할되지 않고 일정구간의 중첩되는 구간이 발생하게 된다. AF 무절연 궤도회로 중 S자 형태의 S-BOND는 약 7m 가량 궤도경계 중첩구간이 있다. 본 논문은 궤도회로 경계구간에 설치된 S-BOND의 중첩된 경계구간을 줄였을 때 궤도회로 동작의 정확성 향상 및 선로이용 효율증대에 관한 연구이다. A track circuit to determine a movement position of a train is divided at a regular distance. These methods of dividing the track have Joint type and Jointless type. The Joint Track Circuit has cut the rail and installs the Joint between rails. The Jointless Track Circuit without the Joint has electrically divided to cut off a current. The track boundary is not clearly separated than the Joint Track Circuit and an overlapping section is generated in the Jointless Track Circuit system. S-form S-BOND of the AF Track circuit has a track boundary overlap of approximately 7m. This paper has studied about an increase accuracy of track circuit operation and about the improvement efficiency of the line use when reduced the overlap of the SBOND installed in the track circuit boundary.
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식도-위 정맥류를 동반한 간경변증 환자에서 성공적으로 시술한 경피내시경하 위루술 1예
박동훈 ( Dong Hoon Park ),김재우 ( Jae Woo Kim ),김규홍 ( Kyu Hong Kim ),김혜정 ( Hye Jung Kim ),지명관 ( Myeong Gwan Jee ),박용순 ( Yong Soon Park ),백순구 ( Soon Koo Baik ),김현수 ( Hyun Soo Kim ),권상옥 ( Sang Ok Kwon ) 대한소화기학회 2006 대한소화기학회지 Vol.48 No.1
Malnutrition in patients with liver disease is common. Consequently, percutaneous endoscopic gastrostomy may be needed for the correction of malnutrition. Percutaneous endoscopic gastrostomy is rarely performed in patients with liver cirrhosis because of the presence of varices and coagulation abnormalities. However, if careful insertion technique along with thorough clinical assessment is undertaken, percutaneous endoscopic gastrostomy may be successfully performed in patients with liver cirrhosis. Here, we report successful application of percutaneous endoscopic gastrostomy in a patient with liver cirrhosis accompanied by both gastric and esophageal varices. (Korean J Gastroenterol 2006;48:51-54)
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박동훈(Park, Dong-Hoon),최명진(Choi, Myung-Jin) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.9
A variable friction damper for vehicle driveline has been proposed. This new torsional damper system uses a solenoid as an actuator to vary friction force of the damper. To verify the idea of using a solenoid in a variable damper system, the test fixture and the dampers are made and tested. Also, to find out the range of damper friction forces that influence the vehicle driveline vibration, a mathematical model of the driveline had been developed and simulated. Test and simulation results show that, within electric current used in the vehicle electric system, the solenoid can develop enough friction force that will surpass resonance in the driveline of 1.5 L Gasoline engine vehicle during acceleration.
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박동훈(Dong-Hoon Park),김귀성(Gui-Sung Kim),김형은(Hyung-Eun Kim),박혜미(Hye-Mi Park),위개(Kai Wei),임은천(Eun-Cheon Lim),이문규(Moon-Que Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In this paper, we propose an antenna module with high isolation between Tx and Rx in RFID reader module. The proposed module consists of a quadrafilar antenna and a directional coupler with a switchable dummy load to improve the directivity. The proposed module achieves the isolation higher than 20 ㏈ between Tx and Rx. To show the validity of the proposed scheme, we have performed the measurement of tagging range and multi-tagging ability. The experiment results show that the detecting range and multi-tagging ability are enhanced by 81% and 200%, respectively.
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