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우종관(Jong Kwan Woo),배준우(Joon Woo Bae),이춘열(Choon Yeol Lee),채영석(Young Suck Chai) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
In nuclear power plant, fretting wear, caused by flow induced vibration (FIV), can make a serious problem in a U-tube bundle in steam generator. In this study, finite element analysis of the fretting wear on the secondary side of the steam generator was investigated which arises between U-tubes and their supports or foreign objects. Using finite element method, two-dimensional models with cylindrical or plate supports were adopted to investigate the fretting wear problems. As boundary conditions, various combinations of loads are applied to verify different fretting mechanisms, such as stick only, stick-slip and gross slip wear. For this purpose, four different load conditions are considered and in the finite element analysis, ABAQUS are used with the program which is developed to calculate wear depth and modify input files at each cycle. As a result, regions for each wear mechanism are found and fretting wear map is constructed, which can be used as a reference or criterion for fretting wear experiments.
A Low Noise Amplifier for Neural Recording System
나승인(Seung-in Na),이상훈(Sang Hoon Lee),이현중(Hyunjoong Lee),우종관(Jong-Kwan Woo),김선권(Sun Kwon Kim),김수환(Suhwan Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
This paper describes a low-power and low-noise amplifier for neural recording application. This amplifier adopts the concept of active low frequency suppression. An integrator located in the amplifier is employed for placing high cutoff frequency in the transfer function. This circuit has been implemented in the 0.35μm CMOS process. the current consumption of the amplifier is 3.83μA at 3.3V supply voltage. The low noise amplifier achieves midband gain of 43dB and -3dB bandwidth of 100Hz~11.5kHz. The input-referred noise is 11.94μ Vrms corresponding to an NEF of 8.05.