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OFDM/CDMA 통신용 부분 병렬 FWHT 프로세서 설계
황지우(Jiwoo Hwang),황용택(Yongtaek Hwang),김민수(Minsu Kim),유호영(Hoyoung Yoo) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
In this paper, we propose an efficient FWHT architecture for OFDM and CDMA communications, aiming to achieve low hardware complexity and intuitive structure compared to previous designs. Since FWHT is based on Cooley-Tukey algorithm, it has a similar data flow to FFT. Previous research has explored applying FFT structures to FWHT architectures but encountered the trade-off issues between hardware complexity and process ing throughput in limited hardware resources. The proposed Partially parallel FWHT architecture utilizes an efficient data reordering process to provide improved performance in terms of hardware complexity and efficiency compared to previous architecture.
가시화 엔진을 이용한 직분식 디젤엔진의 유동장 측정에 관한 연구
한용택(Yongtaek Han),황규민(Kyumin Hwang),이기형(Kihyung Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This paper studies the effects of the swirl for the variation of intake port configuration that is key parameters in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on air-fuel mixing, combustion, and emissions. To investigate the effects of the swirl flow, various rpm(250, 500, 750) and two different intake port were used. And to evaluate the swirl motion in the flow field visualization engine, steady state flow test was conducted. Helical port intake port and SCV(Swirl Control Valve) were selected as the design parameters to increase the swirl flow and parametric study was performed. In the case of non-SCV, intake flow rate and non-dimensional swirl ratio were higher than those of SCV for the swirl head type. So, we could strengthen the swirl in the flow field with the swirl head type and don't using SCV. From the results of steady state flow test, non-swirl head type has the most good advantage for intake flow rate, and also the flow rate could be increased by using the SCV slightly. The effects of the type of engine head on intake air flow capability are dominant with respect to the existence of the SCV. We could measure the qualitative grade of swirl by capturing the scattering signal of microballoon from ICCD camera in the visualization diesel engine.
가시화 엔진을 이용한 직분식 디젤엔진내의 유동장 측정에 관한 연구
한용택(Yongtaek Han),황규민(Kyumin Hwang),이기형(Kihyung Lee) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.1
This paper studies the effects of the swirl for the variation of intake port configuration that is key parameters in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on air-fuel mixing, combustion, and emissions. To investigate the effects of the swirl flow, various rpm(250, 500, 750) and two different intake port were used. And to evaluate the swirl motion in the flow field visualization engine, steady state flow test was conducted. Helical port intake port and SCV(Swirl Control Valve) were selected as the design parameters to increase the swirl flow and parametric study was performed. In the case of non-SCV, intake flow rate and non-dimensional swirl ratio were higher than those of SCV for the swirl head type. So, we could strengthen the swirl in the flow field with the swirl head type and don't using SCV. From the results of steady state flow test, non-swirl head type has the most good advantage for intake flow rate, and also the flow rate could be increased by using the SCV slightly. The effects of the type of engine head on intake air flow capability are dominant with respect to the existence of the SCV. We could measure the qualitative grade of swirl by capturing the scattering signal of microballoon from ICCD camera in the visualization diesel engine.