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V2X 및 환경 센서 융합 기반 교차로 안전 시스템 알고리즘 개발
박만복(Manbok Park),이상현(Sanghyun Lee),전시범(Sibum Jun),기석철(Seokcheol Kee),김정범(Jungbeom Kim),기창돈(Changdon Kee),김규원(Kyuwon Kim),이경수(Kyongsu Yi) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.5
This paper describes the development and verification of control algorithms for V2X and environmental sensor integrated intersection support and safety systems. The objective of the research is to develop core technologies for effective fusion of V2X and environmental sensors and to develop new safety function for intersection safety. One of core technologies is to achieve the improvement of GPS accuracy, and the other is to develop the algorithm of a vehicle identification which matches all data from V2X, vehicle sensors and environmental sensors to specific vehicles. A intersection optimal pass (IOP) algorithm is designed based on these core technologies. IOP recommends appropriate speed to pass the intersection in the consideration of traffic light signal and preceeding vehicle existence. Another function is developed to prevent a collision avoidance when car crash caused by traffic violation of surrounding vehicles is expected. Finally all functions are implemented and tested in three test vehicles. It is shown that IOP can support convenient and comfortable driving with recommending optimal pass speed and collision avoidance algorithm can effectively prevent collision caused by traffic sign violation of surrounding vehicles.
Lipid-Hydrogel-Nanostructure Hybrid and Its Anti-Biofilm Properties
Hyun-Ha Park(박현하),Kahyun Sun(선가현),Hoon Yi(이훈),Hangil Ko(고한길),Minho Seong(성민호),Insol Hwang(황인솔),SangHyun Lee(이상현),Minsu Kang(강민수),Hyunwook Ko(고현욱),Hoon-Eui Jeong(정훈의) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Despite extensive efforts toward developing anti-biofilm materials, efficient prevention of biofilm formation remains challenging. Diverse polymeric materials with bactericidal or antifouling properties have strong potential as efficient antibiofilm materials. However, approaches based on a single strategy using either bactericidal polymers, antifouling coatings, or nano-patterning of polymers have shown limited performance in the prevention of biofilm formation. This study presents a lipid-hydrogel-nanotopography hybrid that has highly efficient biofilm-resistant properties. The hybrid material consists of nanostructured antifouling, biocompatible polyethylene glycol (PEG)-based polymer covered with a membrane-mimicking, antifouling, biocompatible zwitterionic polymer of 2-methacryloryloxyethyl phosphorylcholine (MPC). Surface chemistry of the polymeric hybrid is analyzed with attenuated total reflectance-fourier transform infrared (ATR-FTIR) spectroscopy and x-ray photoelectron spectroscopy (XPS). Based on the unique heterogeneous chemical compositions, the lipid-hydrogel-nanostructure hybrid exhibits superior dual functionalities of antifouling and bactericidal activities against gram-negative and -positive bacteria, compared with those of surfaces composed of single type of polymer.
SnO<sub>2</sub> 나노와이어를 이용한 저온동작 고감도 고선택성 NO<sub>2</sub> 가스센서
김유종 ( Yoojong Kim ),박소영 ( So-young Bak ),이정석 ( Jeongseok Lee ),이세형 ( Se-hyeong Lee ),우경완 ( Kyoungwan Woo ),이상현 ( Sanghyun Lee ),이문석 ( Moonsuk Yi ) 한국센서학회 2021 센서학회지 Vol.30 No.3
In this paper, methods for improving the sensitivity of gas sensors to NO<sub>2</sub> gas are presented. A gas sensor was fabricated based on an SnO<sub>2</sub> nanowire network using the vapor-phase-growth method. In the gas sensor, the Au electrode was replaced with a fluorinedoped tin oxide (FTO) electrode, to achieve high sensitivity at low temperatures and concentrations. The gas sensor with the FTO electrode was more sensitive to NO<sub>2</sub> gas than the sensor with the Au electrode: notably, both sensors were based on typical SnO<sub>2</sub> nanowire network. When the Au electrode was replaced by the FTO electrode, the sensitivity improved, as the contact resistance decreased and the surface-to-volume ratio increased. The morphological features of the fabricated gas sensor were characterized in detail via field-emission scanning electron microscopy and X-ray diffraction analysis.