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Effect of the Axial Heat Flux on the Critical Heat Flux in Low Flow Conditions with Vertical Annuli
MOON, Sang-Ki,CHUN, Se-Young,PARK, Jong-Kuk,BAEK, Won-Pil Atomic Energy Society of Japan 2006 Journal of nuclear science and technology Vol.43 No.11
<P>An experimental study on the critical heat flux (CHF) has been performed for a water flow in vertical annuli with uniform and chopped cosine axial heat flux distributions under low flow and a wide range of pressure conditions. The effect of an axial heat flux distribution on the critical power is large at low-pressure conditions, but the effect decreases rapidly as the pressure increases. The ‘overall power’ hypothesis becomes more accurate as the pressure and critical quality increase, and the ‘local conditions’ hypothesis is not valid at high quality conditions. For a fixed mass flux and pressure, the relationship between the critical quality and the boiling length is represented by a single curve for the whole range of the present experimental conditions, regardless of the axial heat flux distributions. Smolin <I>et al.</I>’s <I>F</I>-factor and Bowring’s <I>Y</I> parameter show good prediction results for the present CHF data.</P>
Kuk Won Ko,Jiyeon Lee,Hongsuk Moon,Sangjoon Lee 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
Biometric techniques for authentication using body parts such as a fingerprint, face, iris, voice, finger-vein and also photoplethysmography have become increasingly important in the personal security field, including door access control, finance security, electronic passport, and mobile device. Finger-vein images are now used to human identification, however, difficulties in recognizing finger-vein images are caused by capturing under various conditions, such as different temperatures and illumination, and noise in the acquisition camera. The human photoplethysmography is also important signal for human identification. In this paper To increase the recognition rate, we develop camera based identification method by combining finger vein image and photoplethysmography signal. We use a compact CMOS camera with a penetrating infrared LED light source to acquire images of finger vein and photoplethysmography signal. In addition, we suggest a simple pattern matching method to reduce the calculation time for embedded environments. The experimental results show that our simple system has good results in terms of speed and accuracy for personal identification compared to the result of only finger vein images.
Jae-Kuk Kim,Sung Sae Lee,Won-Sik Oh,Jung-Eun Kim,Gun-Woo Moon,Chang-Hyun Gil,Ja-Ryong Cho 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
The asymmetrical half-bridge converter is widely used for PC power supply. However, severe inrush current produces in this converter at start-up. This paper presents startup inrush current reduction technique of asymmetrical halfbridge DC/DC converter for PC power supply. The proposed asymmetrical half-bridge converter is composed of series connected two link capacitors, center-tapped transformer and blocking capacitor. The proposed converter can reduce the severe start-up inrush current by using the small blocking capacitor. The validity of this study is confirmed from the experimental results.