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권성진(Seong-Jin Kwon),전지훈(Jee-Hoon Chun),구태윤(Tae-Yun Koo),조기용(Ki-Yong Cho),서명원(Myun-Won Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
The main system function of the FVCWS (Forward Vehicle Collision Warning System) is to warn the driver when the following vehicle encounters the situation when a leading vehicle in the following vehicle's trajectory becomes a potential hazard. Much research on the warning algorithms for the FVCWS has been carried out. However, human factors to design the warning algorithms for the FVCWS must be considered to decide the suitable warning critical distance. In this study, the driver's perception response experiment is carried out on the VR (Virtual Reality) based vehicle simulator. The experimental results against driver's perception response time and the maximum vehicle deceleration corresponding to leading vehicle's sudden braking are reflected to the forward vehicle collision warning algorithm which decides the warning critical distance. It can be useful in the design of the FVCWS with due regard to human factors such as driver's behavior and driving characteristics on various driving conditions.
브레이크 패드 마찰재의 탄성 물성 측정을 이용한 NVH 해석
권성진(Seong-Jin Kwon),이동원(Dong-Won Lee),배철용(Chul-Yong Bae),이봉현(Bong-Hyun Lee),서병연(Byoung-Youn Seo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The elastic properties of friction materials in brake pads are important design parameters because modulus variations may be significant in noise generation of automotive braking systems. In this paper, the elastic properties of friction materials have been investigated through the precise ultrasonic velocity measurements. By exploiting the fundamental relationship among sound speed in specific propagation directions and the elastic constants, the engineering constants, i.e. Young’s modulus, shear modulus, and Poisson’s ratio, have been determined. With the measured elastic constants and engineering constants, the vibration characteristic analysis based on finite elements method has been carried out to analyze the modal characteristics and the squeal noise characteristics of the target disc brake systes.
권성진,최완성,권선옥,송광섭,김화진,김윤숙 한국통합생물학회 2014 Animal cells and systems Vol.18 No.2
Continuous exercise and bright light affect brain function, particularly in seasonal affective disorders. However,the underlying mechanism of action remains unclear. In this study, we examined whether low-intensity treadmillexercise and 4 weeks of bright light exposure change the expression of brain-derived neurotrophic factor(BDNF), phosphoinositide 3-kinase/AKT (PI3K/AKT) pathway, protein kinase C (PKC), extracellular signalregulatedkinases (ERK1/2), cyclic adenosine monophosphate (cAMP) response element-binding protein(CREB), vascular endothelial growth factor (VEGF), and glycogen synthase kinase-3β (GSK-3β) in the brainof 5-week old Sprague–Dawley male rats by performing western blot analysis. We demonstrated that BDNFexpression significantly increased with exercise and light exposure compared to a control group. Moreover, wefound that the expression levels of PI3K, PKC, p-ERK1/2, p-CREB, p-AKT, and VEGF increased significantly inthe hippocampus and cortex with exercise and light exposure compared to the levels from a control group. However, phosphorylated GSK-3β level was unchanged, and even slightly decreased with exercise and lightexposure. These results suggest that low-intensity treadmill exercise and bright light exposure induce BDNFexpression and activate its downstream kinase signaling pathway, which in turn activate CREB-mediatedtranscription of neurotrophic factors and may stimulate neurogenesis and improve neuronal functions.