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미세유체시스템의 유체이송을 위한 탄성체의 복원력을 이용한 흡입형 미세유체펌프
변강일(Kang Il Byun),한의돈(Eui Don Han),김병희(Byeong Hee Kim),서영호(Young Ho Seo) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.1
This paper presents a disposable passive suction pump that uses the restoring force of an elastomeric chamber for liquid transportation in a microfluidic system. The proposed suction pump can be operated by finger pressure without any peripheral equipment. To adjust the generated suction pressure, five different displacements of the suction chamber ceiling, two different chamber shapes, and five different elastic moduli of the elastomer were considered. For a cylindrical chamber with a 5 mm height and 5 ㎜ radius, the generated suction pressure and flow rate increased almost linearly up to about 31 ㎪ and 160.8 μL/min, respectively, depending on the chamber deformation. A maximum suction pressure of 42.9±0.7 ㎪ was obtained for a hemispherical chamber with a 2.1 ㎜ height and 5 ㎜ radius.
나선형 미세채널 내부에 형성되는 딘와류 이용한 미세입자 분리소자
변강일(Kang Il Byun),김형진(Hyung Jin Kim),김병희(Byeong Hee Kim),서영호(Young Ho Seo) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.6
This paper presents a microparticle separator using a spiral microchannel. A particle separator based on the dean vortex was designed, fabricated, and characterized. Two different spiral microchannels were fabricated. Width and initial radius of rotation in the spiral microchannel were fixed to 300 μm and 1.75 mm, respectively. Two different depths of the microchannels were designed at 50 μm and 80 μm. In this experimental study, the equilibrium position of microparticles was monitored by using fluorescent microbeads. In the case of a low dean number (<1.0), lift force and dean drag force were similar, indicating that microbeads were distributed to almost all areas across microchannels. However, in the case of a high dean number (>1.0), dean drag force rather than lift force was dominant, indicating that microbeads moved toward the inner wall of the spiral microchannel.
변강일(Gangil Byun),한원근(Wone Keun Han),추호성(Hosung Choo) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.2
본 논문에서는 커플링 급전 구조를 가지는 항공기용 양면 인쇄형 글래스 안테나를 제안하였다. 제안된 안테나는 한 개의 급전 선로와 다중 루프 형상의 방사 소자로 구성되며, 조종석 좌측 창문의 서로 다른 면에 위치하여 제한된 면적을 효율적으로 사용하도록 하였다. 제안된 안테나는 유전자 알고리즘을 이용하여 최적화 하였으며, 최적화된 안테나를 1/10 크기의 KUH-Surion에 장착하여 안테나 성능을 측정하였다. 최적화된 안테나는 해당 대역의 중심 주파수에서 33 %의 반전력 대역폭을 가지며, 평균 ?3.49 ㏈i의 전면 방향 복사 이득을 갖는다. 제안된 글래스 안테나의 수신 성능을 평가하기 위해 반경 200 ㎞에서의 수신 전력을 시뮬레이션 하였으며, 그 결과 현재 항공기용 FM 안테나로 사용 중인 pole 안테나와 비슷한 ?60 ㏈m의 최소 수신 전력을 유지하는 것을 확인하였다. In this paper, we propose a double-faced window printed antenna for aircraft applications. The proposed antenna structure consists of a feeding line and a multi-loop radiator located on different sides of the window to use the limited given-area effectively. The proposed antenna is optimized by the genetic algorithm in conjunction with the FEKO EM simulator. The optimized antenna is built and installed on a 1/10 sized KUH-Surion mock-up and antenna performances such as the reflection coefficient and the radiation patterns are measured. The optimized antenna shows a half power matching bandwidth of about 33 % at 60 ㎒ and an average bore-sight gain of about ?3.49 ㏈i. To verify the reception capability of the optimized antenna, we simulated the received power according to a flight scenario. The result confirms that the optimized antenna shows a minimum received power level above ?60 ㏈m at a range of 200 ㎞, which is similar to the pole antenna that is currently used as a FM voice antenna for KUH-Surion.
전자식 점화안전장치 회로 시스템 내부 소자 변화에 따른 민감 소자 확인 및 출력 특성에 대한 신뢰성 분석 프로세스
임태흥,변강일,장승교,백승준,손영갑,추호성 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.5
In this paper, we analyzed the operation of the ignition circuit for electronic arm and fire device(EAFD), and investigated the sensitive elements of the circuit system. For reliability analysis, the EAFD ignition circuit was modeled using the PSpice simulation tool, and the output results of the circuit were examined by changing the tolerance of each circuit element. Monte Carlo simulation was used by maintaining the values of the observed sensitive elements at ±10 % of the original values and adjusting the values of the other components according to a random distribution. The histogram results of the output peak currents and pulse widths were represented by Weibull and Burr type XII function fittings in three cases(element values are +10 %, 0 %, -10 % of original). For the output peak currents, mean values were 1.0028, 1.0034, and 1.0050, where the variance values were calculated as 0.0398, 0.0396, and 0.0290 using the Weibull function fitting, respectively. For pulse widths, the mean values of 0.9475, 0.9907, and 1.0293 with the variance values of 0.0260, 0.0251, and 0.0238 were obtained using the Burr Type XII function fittings.