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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),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.
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
중앙 분사방식의 직분식 가솔린 기관에서 연료 혼합기 형성에 미치는 분사시기와 캐비티 형상의 영향
김태안(Taean Kim),강정중(Jeongjung Kang),김덕줄(Duckjool Kim) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.2
This study was performed to investigate the behavior of liquid and vapor phase of fuel mixtures with different piston cavity diameters in a optically accessible engine. The conventional engine was modified as Central Injected DI gasoline engine with swirl motion. Two dimensional spray fluorescence images of liquid and vapor phase were acquired to analyze spray behavior and fuel distribution inside of cylinder using exciplex fluorescence method. Piston cavity geometries were set by Type S, M and L. The results obtained are as follows. In the spray formation after SOI, the cone angle and width of the spray were decreased at late injection timing. With a fuel injection timing of BTDC 180˚ fuel was not greatly affected in a piston cavity but generally distributed as homogeneous mixture in the cylinder. With a fuel injection timings of BTDC 90˚ and 60˚ fuel mixture was widely distributed in near the cavity center. As a injection timing was late in the compression stroke, residual width of fuel mixture was narrow in proportion to piston cavity.
직분식 가솔린엔진에서 피스톤 형상이 연료 혼합기의 형성과 거동에 미치는 영향
김동욱(Dongwook Kim),강정중(Jeongjung Kang),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.5
This study was performed to investigate the behavior and spatial distribution of fuel mixtures with different wall angle and diameter of piston cavity in a DI gasoline engine. The spatial distribution of fuel mixtures after impingement of the spray against a piston cavity is one of the most important factors for the stratification of fuel mixture. Thus, it is informative to understand in detail the behavior and spatial distribution of fuel mixtures after impingement in the cavity. Two dimensional spray fluorescence images of liquid and vapor phase were acquired to analyze the behavior and distribution of fuel mixtures inside cylinder by exciplex fluorescence method. The exciplex system of fluorobenzene / DEMA in non-fluorescing base fuel of hexane was employed. Cavity wall angle was defined as an exterior angle of piston cavity. Wall angles of the piston cavity were set to 30, 60 and 90 degrees, respectively. The spray impinges on the cavity and diffuses along the cavity wall by its momentum. In the case of 30 degrees, the rolling-up moved from the impinging location to the round and fuel-rich mixture distributed at periphery of cylinder. In the case of 60 and 90 degrees, the rolling-up recircurated in the cavity and fuel mixtures concentrated at center region. High concentrated fuel vapor phase was observed in the cavity with 90 degrees. From present study, it was found that the desirable cavity wall angle with cavity diameter for stratification in a DI gasoline engine was demonstrated.
직접분사식 가솔린기관에서 분사시기와 흡기유동이 연료분포에 미치는 영향
이정훈(Jeonghoon Lee),강정중(Jeongjung Kang),김덕줄(Duckjool Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to investigate the effect of the in-cylinder 리ows and different injection timings on fuel distributions in the cylinder of a direct-injection S.I engine. Three different flow types induced by using masked port, unmasked port, and port deactivation were tumble, swirl&tumble, and high swirl respectively. Injection timings of 180, 90 and 60 degrees<br/> before TDC were examined. LIEF techniques was applied to visualize the mixture formatio<br/> and spatial distribution of fuel in the transparent engine with optical access through the pisto top and the upper part of cylinder liner.<br/> It was found that tumble now is more effective on the homogeneous mixture formation tha other 리ow at early injection mode and moderately swirl is needed to concentrate fuel vapo around the spark plug at late injection mode.<br/>