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서동현(Donghyun Seo),최유준(Youjun Choi),김범진(Beomjin Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
In this paper, we developed a precise driving system of a vehicle by using a magnet for precise driving of a vehicle and a Hall Effect Sensor IC of low price. First, using the Gauss meter, the magnetic field by the magnet was measured, the characteristics of the magnetic field was confirmed, and the arrangement method of the sensor was decided. For the performance test, we constructed a test environment in the Testbed and the road, attached the sensor module developed to the vehicle and confirmed that it is possible to driving with high accuracy through the test.
초발수 표면 위 마이크로 구조물의 기하학적 패턴에 따른 물 수집 성능의 영향
서동현(Donghyun Seo),이충엽(Choongyeop Lee),남영석(Youngsuk Nam) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
On superhydrophobic (SHPo) surfaces, either of two wetting states ?the Cassie state (i.e., non-wetted state) and the Wenzel state (i.e., wetted state) ? can be observed depending on the thermodynamic energy of each state and experimental conditions. Each wetting state leads to quite a distinctive dynamic characteristic of the liquid drop on SHPo surfaces and it has been of primary interest to understand or induce the desirable wetting state for relevant thermofluid engineering applications. In this study, we investigate how the wetting state of microstructured SHPo surfaces influences water harvesting performance of the SHPo surface via dewing by testing two different surface patterns of posts and grates with varying structural parameters. On grates, the observed wetting state during condensation is well described by the thermodynamic energy criteria and it is seen that the Cassie state is associated with the faster removal of smaller droplets due to the higher drop mobility compared with the Wenzel state. Meanwhile, on posts, the observed wetting state is dominantly the Wenzel state regardless of the thermodynamic energy of each state, and due to much larger pinning force of the Wenzel state the condensates are shed slowly only after they grow to a sufficiently large size. Based on a simple modeling, we attribute this difference in the droplet shedding characteristics to the different dynamic pathway from the Wenzel state to the Cassie state between posts and grates. Overall, the faster drop removal on the SHPo surface helps enhance the water harvesting performance of the SHPo surfaces by facilitating the condensation on the droplet-free area, as manifested by the best water harvesting performance of gratings on the Cassie state amongst the tested surfaces.
내비게이션을 이용한 DBL (Dynamic Bending Light) 시스템의 평가방법 개발
서동현(Donghyun Seo),신외경(Waegyeong Shin),문희석(Heeseok Moon),손영호(YoungHo Son),한덕구(Deokgu Han) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Technologies have been developed actively to enhance safe driving in the intelligent automobile technology field and the head lamp technology is taking an important part of the development. Currently, adaptive front lighting system integrated with GPS and digital map or navigation is under development, and it provides the beam pattern actively optimized according to various road conditions to give a wider view to enhance safe driving, and this study intends to develop an optimized method for evaluating the system which integrates the navigation technology and the head lamp technology. An environment capable of evaluating the bending angle of the head lamp system integrated with the navigation was developed in a simple actuator control technology oriented evaluation environment by using the vehicle simulator and GPS radiation system, and this predicts the road curvature using the navigation and evaluates the change in the beam pattern of the head lamp according to the road curvature.
서동현(Donghyun Seo),최유준(Youjun Choi),김범진(Beomjin Kim),신희성(Heesung Shin) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
In this paper, we developed a sensor module using the characteristics of an MR sensor and developed a system capable of precise parking using magnets. First, using the Gauss meter, the magnetic field by the magnet was measured, the characteristics of the magnetic field was confirmed, and the arrangement method of the sensor was decided. For the performance test, we constructed a test environment in the Testbed and the road, attached the sensor module developed to the vehicle and confirmed that it is possible to parking with high accuracy through the test.