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강동민(D. M. Kang),정영래(Y. R. Jung),박원규(W. G. Park),하성도(S. D. Ha) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
This paper describes the flow field analysis of an automobile with crosswind effects of 15˚, 30˚, 45˚ and 60˚ of yaw angles. The governing equations of the 3-D incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. The computated surface pressure coefficients have been compared with experimental results and a good agreement has been achieved. The A- and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown. The variation of aerodynamic coefficients of drag. lift. side force and moments with respect to yaw angle is systematically studied.
강동민(D. M. Kang),정영래(Y. R. Jung),박원규(W. G. Park) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
This paper describes the flow analysis of the automobile with crosswind effects of 15˚, 30˚ and 45˚ of yaw angle. The governing equations of the 3-D unsteady incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The Chimera grid technique has been applied to efficiently simulate the flow around the side-view mirror. The A- and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown.
40W GaN-on-SiC HEMT 소자를 이용한 X-대역 전력증폭기
강동민(Dong-Min Kang),민병규(Byung-Gyu Min),이종민(Jong-Min Lee),윤형섭(Hyung-Sup Yoon),김성일(Sung-Il Kim),안호균(Ho-Kyun Ahn),임종원(Jong-Won Lim),남은수 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
This paper describes the successful development and the performance of X-band 40 W pulsed power amplifier using a 40 W GaN-on-SiC High Electron Mobility Transistor(HEMT). The GaN HEMT with a gate length of 0.25 ㎛ and a total gate width of 12 mm were fabricated. The GaN HEMT provide a linear gain of 6 dB with 42 W output power operated at 30V drain voltage in pulse operation with a pulse width 100 ㎲ and 10 % duty cycle at X-band. It also shows a maximum output power density of 3.3 W/mm. The X-band pulsed power amplifier exhibited an output power of 42 W(46.2 dBm) with a power gain of 6 dB in a frequency range of 9.2 - 9.5 GHz.. This 40 W GaN HEMT and X-band 40 W pulsed power amplifier are suitable for the radar systems and related applications in X-band.
[차량운동성능부문] 후미경사각 변화에 따른 자동차 저저항 설계에 관한 수치적 연구
강동민(Dongmin Kang),이종칠(Jongchil Lee),박원규(Warngyu Park),정영래(Youngrae Jung) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, numerical analysis is used to find the effects of rear end slant angle acting on low drag design of an automobile. The rear end slope angles used in this study are 24', 26.6', 28.6', 31.6', 36.4'. The governing equations of the 3-D incompressible Navier-Stokes equations are solved by the iterative time marching scheme. The computed surface pressure coefficients have been compared with experimental results and a good agreement has been achieved. The A- and C-pillar vortex and other flow phenomena around the ground vehicle are evidently shown. The variation of aerodynamic coefficients of drag, lift with respect to rear end slant angle are systematically studied.