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강정중(Jeongjung Kang),정윤재(Yunjae Jeong),윤영식(Youngsik Yoon),이종현(Jonghyun Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The most important functional aspects of any indirect visibility system for use on motorcycles are how quickly and accurately it enables drivers to detect, locate, and identify targets that are likely to be encountered around the vehicle. The purpose of this comparative study is to identify the data to improve the field of indirect vision of motorcycles in korea. The comparative analysis was made of the rear view mirrors of motorcycles in Korea with ECE Regulation 81, the article 44 of the Safety Regulations for Road Vehicles in Japan, FMVSS and CMVSS. And It was measured to the installation positions, coefficient of reflection, and the radius of curvature of review mirrors sold in Korea. As a result, We found it is necessary to harmonize KMVSS in regards to rear view mirrors with ECE R.81 in order to improve fields of indirect vision and enhance safety of the motorcycle.
DI 가솔린 기관의 피스톤 캐비티 직경에 따른 연료의 액.기상 거동
강정중(Jeong-Jung Kang),김태안(Tae-An Kim),김덕줄(Duck-Jool Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was performed to investigate the behavior of liquid and vapor phases of fuel mixtures with different piston cavity diameters in a optically accessible engine. The images of liquid and vapor phases were measured in the motoring engine using LIEF method. Injection pressure is 5.1 MPa. Two dimensional spray fluorescence images of liquid and vapor phases were acquired to analyze spray behavior and fuel distribution inside of cylinder. Three injection timings were set at bTDC 180°, 90°and 60°. The results obtained are as follows. With a fuel injection timing of bTDC 60°, fuel-rich mixture was concentrated in near the cavity center. With a fuel injection timing of bTDC 90°, fuel-rich mixture level in the center region was highest in the Type-M during the compression stroke. With a fuel injection timing of bTDC 180°, fuel was not affected in a piston cavity and generally distributed as homogeneous mixture. The spray dispersion at injection timing of bTDC 90° was smaller than bTDC 300°.<br/>
분사시기와 피스톤 형상에 의한 연료 증기상의 공간분포에 관한 연구
강정중(Jeong-jung Kang),김덕줄(Duck-jool Kim) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
This work is to investigate the spatial distribution of fuel vapor phase with different injection timing and piston cavity in a optically accessible engine. Two dimensional spray fluorescence image of fuel vapor phase was captured under the motoring condition using LIEF method. Fuel was injected into atmospheric nitrogen to prevent quenching phenomenon by oxygen. To generate swirl motion of intake flow, mask was installed at the inlet of the intake port. Three different piston types, F, Band R-type were used. Four injection timings were set at BTDC 90˚, 80˚ ,70˚ , and 60˚ . At a fuel injection timing of BTDC 90˚ , fuel-rich mixture level in the center region was highest in a B-type piston, while fuel vapor was transported to the exhaust valve by swirl flow in F, R-type pistons. At a fuel injection timing of BTDC 60˚ , R-type piston was better in stratification than the others. It is found that R-type piston was suitable under enhanced swirl ratio condition.
국내 화물자동차의 후방(간접)시계 개선을 위한 기준 비교연구
강정중(Jeongjung Kang),이호상(Hosang Lee),강병도(Byungdo Kang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The most important functional aspects of any indirect visibility system for use on heavy vehicle are how quickly and accurately it enables drivers to detect, locate, and identify targets that are likely to be encountered around the vehicle. The purpose of this comparative study is to identify the data to improve the field of indirect vision of heavy vehicles in korea. The comparative analysis was made of the field of indirect vision of heavy vehicles in Korea with ECE Regulation 46 and the article 44 of the Safety Regulations for Road Vehicles in Japan by Ramsis. And It was measured to the field of indirect vision and the radius of curvature of mirrors on vehicles producted in Korea. As a result, We found it was not enough to maintain KMVSS in regard to the field of indirect vision for heavy vehicles in Korea.
강정중(Jeongjung Kang),강병도(Byungdo Kang),이호상(Hosang Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The objective of this study was to propose proper luminous intensity for standardization of warning arrow panels in express highway. Specially, this study focused on determining the minimum photometric levels required for arrow panel recognition during daylight and the maximum levels necessary to control glare at night. In order to provide various and precise intensity levels from the warning arrow panels, Korea Highway Corporation supported LED and Halogen panels and its controller with type of PWM(Pulse Width Modulation). As a result, We found that luminous intensity is no more than 5,500㏅ in order to avoid glare in the case of LED arrow panel at night and in order to enhance legibility it is not less than 4,000cd by daytime