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Hyeonggeun Mun,Gyoungeun Kim,Byeongwoo Kim 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.6
This study developed an algorithm for the determining the application timing of autonomous emergency braking (AEB) under various road friction conditions during driving on a curved road in a vehicle-to-vehicle communication environment. This algorithm, which considers the friction between the tires and the road, was developed to overcome the limitation of the existing algorithm for AEB system brake intervention in which road friction is taken as a constant. The braking and collision avoidance performances of the proposed algorithm were tested in scenarios simulating the velocities of the host and target vehicles and the radii of curvature under various road conditions. The simulation analysis, in which the time-to-collision concept was adopted for braking and collision avoidance tests, revealed that the proposed algorithm provided superior forward collision avoidance performance to the conventional algorithm by adjusting the brake intervention time according to the road friction coefficient.
Photoresist-Free Lithographic Patterning of Solution-Processed Nanostructured Metal Thin Films
Shin, Hyunkwon,Kim, Hyunjun,Lee, Hyeongjae,Yoo, Hyeonggeun,Kim, Jinsoo,Kim, Hyoungsub,Lee, Myeongkyu WILEY-VCH Verlag 2008 ADVANCED MATERIALS Vol.20 No.18
<B>Graphic Abstract</B> <P>Nanostructured Ag thin films solution-deposited on glass and plastic substrates are patterned by direct exposure to a pulsed Nd:YAG laser without using a photoresist layer. Sharp-edged patterns with a feature size scaled down to ca. 2 µm are obtainable. <img src='wiley_img/09359648-2008-20-18-ADMA200800157-content.gif' alt='wiley_img/09359648-2008-20-18-ADMA200800157-content'> </P>
Yoo, Hyeonggeun,Shin, Hyunkwon,Sim, Boyeon,Kim, Sangtae,Lee, Myeongkyu IOP Pub 2009 Nanotechnology Vol.20 No.24
<P>Thin film patterning by the conventional lithographic technique requires a number of steps including the deposition, development, and removal of the photoresist layer. Here we demonstrate that metal thin films evaporated on glass can be directly patterned by a spatially modulated pulsed Nd-YAG laser beam (wavelength = 1064 nm, pulse width = 6 ns) incident from the backside of the substrate. This method utilizes a pulsed laser-induced thermo-elastic force exerted on the film which plays a role in detaching it from the substrate. High-fidelity patterns at the micrometer scale have been fabricated over a few square centimeters by a single pulse with pulse energy of 850 mJ. This is attributed to the fact that deposited metal films are polycrystalline with nano-sized grains, and thus localized etching of the material is possible with shearing along the weakly bonded grain boundary regions. We have also developed a nano-block model to simulate the laser-direct patterning of nanocrystalline thin films. Experimental results could be well described with this simulation model. The patterning process presented here provides a simple photoresist-free route to fabricate metal thin film patterns on transparent substrates.</P>
수냉식 분포권 모터의 사이즈 설계를 위한 손실밀도와 코일 온도의 상관관계 분석
김용호(YongHo Kim),유주성(JuSeong Yu),채승희(SeungHee Chai),박형근(HyeongGeun Park) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
This paper presents improved method for analyze correlation of loss density and coil temperature for a motor size design. Because the current density is unable to reflect on laminating direction of the motor, the conventional method to estimate the temperature of the motor coil considering input current density is limited. The improved method which considers the lamination length and the amount of loss can reflect the cooling phenomenon of the motor. Thus, it can increase the prediction curacy of the coil temperature. In this paper, the heating and cooling characteristics are made into a numerical formula using the heat equivalent circuit. After then, the loss produced by the coil is divided into the flow channel to the cooling system so that the loss per cooling area can be determined to predict the temperature. The performances of the improved method are analyzed and compared with those of the conventional method. Lastly, the result of the both method are compared with the experimental results to verify the validity of the proposed design process.