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이창재(Changjae Lee),정호철(Hochul Jung),장유진(Eugene Chang),이인식(Insik Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There has been lots of parking assistant systems have been proposed to give a driver safe guidance for parallel or garage parking. In this paper, a single camera based parking assistant system is proposed, which is composed of steering actuator, image processing unit which has a role of image to world coordinate mapping or vice versa, and main unit. The mapping logic between image and world coordinate using a single camera is implemented to give a start position of a car and given by a lookup table. The reference trajectory of garage parking consists of an arc of circle and a straight line. The constant steering angle calculated based on geometry is commanded to steering actuator in the circular arc section of reference trajectory. Two methods with constant and fuzzy based steering angles are applied for the tracking of line trajectory.
DSP를 이용한 2㎾급 고효율 Bridgeless PFC Converter
이윤재(Yunjae Lee),유광민(Gwangmin Yoo),신헌철(Heoncheol Shin),고돈열(Donyeol Ko),정호철(Hochul Jung),정유석(Yuseok Jeong),이준영(Junyoung Lee) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
최근 에너지의 근원이 되는 원유가의 급등으로 인해 에너지 소비에 대한 국내외적인 관심이 증폭되어 에너지를 소비하는 측의 효율개선에 대한 요구가 급등하고 있으며 전력변환기 시장에서도 효율이 전력변환기의 사용자의 선택기준이 될 정도로 매우 강력한 실정이다. 본 논문에서는 DSP(TMS320F28035)를 이용한 2kW급 고효율 Bridgeless PFC Converter를 제안한다. 제안된 Converter를 실험을 통해 고효율과 고전력밀도의 기능을 검증하였다.
KyongWhan Moon(문경환),YoungWhan Kim(김영환),YunSu Cho(조윤수),HoChul Jung(정호철),OSung Kwon(권오성),JungHan Lee(이정한) 고려대학교 보건과학연구소 2004 보건과학논집 Vol.30 No.1
The objectives of this study are to investigate the relationship between the silver ion concentrations released from the POU devices installed silver impregnated activated carbon filters and the antibacterial activities against HPC bacteria.<BR> Total of 68 POU devices were tested. The concentrations of the eluted silver ion from the silver impregnated activated carbon filter showed the range from 4 ㎍/ℓ to 386 ㎍/ℓ, and the HPC bacteria were found to diversely grow within the range 0-5,200 cfu/mL.<BR> The average silver concentrations released from UF units system and RO units system were 30 ㎍/ℓ and 73 ㎍/ℓ, respectively. The amounts of silver ions in the water passed through RO units system showed about 2.5 times higher than that of UF system units. And the number of colonies were reduced significantly as the elution levels of silver exceeded 100 ㎍/ℓ, however silver ions below the concentration of 100 ㎍/ℓ were not particularly effective for eradicating HPC bacteria from water.<BR> The pHs of permeated water through reverse osmosis membrane were relatively low compare to those of ultra filtration membrane.