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K-ε모형에 의한 가솔린기관의 화염계수 모형 개선에 관한 연구
이홍국(Hong Guk Lee),최영돈(Young Don Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this study, the flame factor which has been a primary parameter in the simulation of internal combustion engine was estimated by a function of the ratio of turbulent intensity to laminar flame speed. This model could give more accurate flame factor than the previous models. The turbulent flows in the cylinders are generated by three types of flows, swirling flow, tumbling flow and unstructured flow. However turbulent kinetic energies can be generated by the difference of a flame propagation speed and burning speed. The simulation showed that the turbulent motions generated by the flame had play the most important role in combustion process.<br/>
화상처리를 이용한 유연성디스크 가공 평면구간 측정에 관한 연구
노대호,박환서,이홍국,신관수,유송민,Roh, Dae-Ho,Park, Hwan-Seo,Lee, Hong-Guk,Shin, Kwan-Soo,Yoo, Song-Min 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.5
The goal of this study is to simplify the measurement process of the flat zone length produced by a flexible disk grinding system for the process automation. The image of workpiece in the grinding process is obtained, and the cutting speed and the feeding speed are controlled carefully to maximize the flat zone length. The gradient, the inflection point and the length of the line in the image are calculated, and the length is also measured by using a projector. Processing conditions and inversely proportional to flat zone length was changing. The flat zone length is estimated by Neural network algorithm considering the process conditions with the estimated error range as 0.06~3.61%, the Neural network algorithm for the grinding process estimation is found to be useful for building the process automation database.
속도제한 지원장치에 대한 운전자 인식도 및 도로환경 분석
이화수,조재호,임종현,이홍국,장경진,유송민,Lee, Hwa Soo,Cho, Jae Ho,Yim, Jong Hyun,Lee, Hong Guk,Chang, Kyung Jin,Yoo, Song Min 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.3
This study examined the Korean drivers' acceptance of SAS(Speed Assistance systems) and traffic sign conditions in Korea roads for SLIF(Speed Limit Information Function) that is a part of SAS. Exceeding the speed limit is a factor in the severity of many road accidents and SAS would help the driver to observe a speed limit by warning and/or effectively limiting the speed of the vehicle. SAS are in the initial phase in Korea, Korean drivers could not be familiar with automatical speed limiting during driving, SAS interface design would be considered to be more readily acceptable to the public. And advanced SAS have been introduced onto the market which are able to inform the driver of the current speed limit based on camera and/or digital maps based SLIF. These systems are based on external data using sensors, so environmental conditions are an important factor which could cause malfunction of SLIF functions.
이화수,조재호,임종현,이홍국,장경진,유송민,Lee, Hwa Soo,Cho, Jae Ho,Yim, Jong Hyun,Lee, Hong Guk,Chang, Kyung Jin,Yoo, Song Min 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.1
This study examined the drivers' acceptance level of various active safety features with Korean drivers on Seoul urban and city roads. The test vehicle, 2013 Cadillac ATS, was equipped with FCA(Forward Collision Alert), LDW(Lane Departure Warning), SBZA(Side Blind Zone Alert), FRPA(Front/Rear Park Assist), RCTA(Rear Cross Traffic Alert), ACC(Adaptive Cruise Control), and AEB(Autonomous Emergency Braking). Participants had chances to run the tests on those systems in the parking lot accompanied by the 106km long stretch of predetermined route including local road and interurban highway in Seoul and Gyeonggi-do under normal traffic flowing environment. After the test, participants completed a series of questionnaires about the features they experienced. The results revealed that RCTA and SBZA systems received more favourable ratings compared to the other features in avoiding crashes. The respondents preferred sound alerts to haptic ones even though haptic warning methods were better in providing directional information.
유송민(Song Min Yoo),박환서(Hwan Seo Park),이홍국(Hong Guk Lee) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
ITS has been implemented in many possible ways to enhance the proficiency of the roadway infrastructure and moving vehicles operated. Among ITS subtechnologies, AVCS would be the last area to be facilitated and adopted onto the vehicle due to its uncertainty in terms of safety. Vehicle longitudinal control embedded platoon operation was introduced to test the safety feature in case of lead vehicle failure propagating increasing delta V causing serious damages. Even though image processing was proven to be the most promising technology applied to identify lane guiding vehicle, it was still susceptible to environmental changes ahead of the vehicle. Both features were studied to suggest and emphasize the importance of the safety issues in implementing AVCS.