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송준형(Junhyung Song),성동현(Donghyun Sung),이동현(Donghyun Lee),이운성(Woon-Sung Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A lane departure warning system uses vision sensors to monitor vehicle position within its travel lane. and warns a driver if the vehicle drifts out of a lane unintentionally as a result of driver drowsiness. distraction or inattention. In this study, we used a driving simulator to evaluate effectiveness of warning methods in the lane departure warning system. We tested three warning methods including visual, audible and combined warning methods. A waring device has been installed on the dashboard next to the steering wheel. Based on time to lane crossing, warning is given twice. First and second warning is given when the time to lane crossing becomes 1.5 and 1 second, respectively. We analyzed frequency of second warning, return time after first warning, maxim departure distance and resultant overall effectiveness rate. The results show that combination of visual and audible warning is most effective. Analysis of variance shows that difference in effectiveness of warning methods is statistically meaningful.
박주호(Jooho Park),성동현(Donghyun Sung),이운성(Woon-Sung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Adaptive cruise control automatically adjusts vehicle speed and distance to a preceding vehicle, thus enhancing driver comfort and safety. Previous studies showed the adaptive cruise control induces positive behavioral adaptation by drawing consistency in driving speed and headway-time regardless of driving styles. However, the studies also showed that the drivers' reliance on the system induced negative adaptation including reduced lane keeping ability and reduced attention during driving. This study further investigated effect of negative behavioral adaptation to adaptive cruise control. Failure of adaptive cruise control was simulated using a full-scale driving simulator and driver behavior under the simulated failure was studied. Twenty drivers participated in the study to compare reaction time, distance and eye movement. Four different driving scenarios were used: ACC off, ACC on, ACC on followed by brake failure, and ACC on followed by distance sensor failure. Experiment results showed that the drivers took longer time to recognize and react to ACC failure. This indicates potential danger of negative behavioral adaptation and requires prevention strategy.