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유체를 이용하여 위상응답을 제어하기 위해 잉크젯 프린팅으로 구현한 미세유체채널 복합 좌·우향 전송선로
최성진(Sungjin Choi),임성준(Sungjoon Lim) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.1
본 논문은 미세유체채널에 채워진 유체를 이용하여 위상응답을 제어하는, 잉크젯 프린터로 인쇄된 미세유체채널 복합 좌·우향 전송선로(CRLH TL: Composite Right/Left Handed Transmission Line)를 제안한다. 제안된 CRLH TL은 종이 위에 은 나노입자 잉크를 이용하여 인쇄되었으며, Poly Methyl Methacrylate(PMMA)에 레이저 식각을 이용하여 제작된 미세유체채널은 잉크젯 프린터로 인쇄된 접착물질인 SU-8을 이용하여 CRLH TL 위에 부착되었다. 제안된 CRLH TL은 미세유체채널에 채워진 유체에 따라서 위상응답을 변화시킬 수 있으며, 미세유체채널에 각기 다른 유체가 흐를 때, 900 MHz에서 ?10 dB 이하의 반사계수를 유지한 상태로 위상 지연, 0° 위상, 위상 앞섬 특성을 모두 나타낼 수 있음을 확인하였다. 제안된 CRLH TL의 성능은 시뮬레이션 결과와 측정 결과를 통하여 성공적으로 증명되었다. In this paper, a novel fluid controlled phase tunable line using inkjet printed microfluidic composite right/left-handed(CRLH) transmission line(TL) is proposed. A CRLH-TL prototype has been inkjet-printed on a paper substrate using silver nano particle ink. In addition, a laser-etched microfluidic channel in poly methyl methacrylate(PMMA) has been integrated with the CRLH TL using inkjetprinted SU-8 as a bonding material. The proposed TL provides excellent phase-tuning capability that is dependent on the different fluidic materials used. As the fluid is changed, the proposed TL can have negative-phase, zero-phase, and positive-phase characteristics at 900 MHz and reflection coefficient is maintained to below ?10 dB. The performance of the proposed TL is successfully validated using simulation and measurement results.
토션빔액슬 성능 평가를 위한 해석 모델 검증에 관한 연구
최성진(Sungjin Choi),한상원(Sangwon Han),박정원(Jungwon Park),전광기(Kwangki Jeon),최규재(Gyoojae Choi),고형규(Hyunggyu Ko),이동재(Dongjae Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The torsion beam axle type is widely used in the rear suspension for small passenger cars due to low cost. good performance. etc. To develop the torsion beam axle. it is necessary to estimate of the characteristics of rear suspension from the design process. The characteristics estimation of the torsion beam axle is performed using FEM. dynamic simulation and is veri fied the real test. In this study. the natural frequency and roll stiffness of the torsion beam axil: were measured by FEM. and the reliability of the FE model was evaluated according to the comparison of test data. This study presents a unique method for the finite element modeling and analysis of the torsion beam axle. The results of the FEA were verified using test data.
DC/DC 컨버터의 파라미터 변화를 고려한 구간분석법 기반 제어기 설계
최성진(Sungjin Choi) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.10
By performing interval analysis on the system transfer function, we propose an improved method of control loop design for a DC/DC converter. In conventional design methods, the effect of system parameter change due to the specified range of operating conditions and production tolerances in power components should be checked a posteriori, because this may result in a transfer function shift and performance degradation. In the proposed method, a possible parameter change is considered a priori in the design step in order that the desired crossover frequency and sufficient phase margin can be achieved even in the worst case condition. As an illustrative example, a buck dc/dc converter is designed by two different methods and performance comparisons are performed to verify the feasibility of the proposed scheme.