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Nondestmctive Evaluation of Cracks in Metal Plates by using SQUID Gradiometer
황윤석,김진태,이순걸,박용기 한국초전도학회 2002 Progress in superconductivity Vol.3 No.2
We have detected cracks inside multi-layer metal sheets with nondestructive evaluation system consisting of SQUID gradiometer. Double D-shape coil was carefully designed with computer simulation for spatial distribution of magnetic field. It was aligned and placed in between SQUID and metal sheets in order to reduce the field effect to SQUID and to maximize eddy current in the sheets. The metal plate in bottom of the metal stack contained artificial cracks which were scanned by an X-Y scanning system. The information of crack position and size could be estimated by analysis of SQUID signal. Details of the results will be discussed .
황윤석,이원선,백인수,유능수 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B
The wind data measured from automated weather stations (AWS) at complex terrains in Korea was used to predict the wind velocity at nearby sites that are several kilometers away. The ten-minute averaged wind data was measured at a height of 10 meters. A commercial CFD code, WindSIM, based on the weighted averaged Navier-Stokes equation was employed. The results were compared with the data measured using meteorological masts (MM) at a height of 40 meters. The predictions using the AWS data and WindSIM showed good agreements with the measured data.
황윤석 한국헤세학회 2006 헤세연구 Vol.16 No.-
Die romantische Stadt HeidelbergHwang, Youn-Suk (Kyungwon Uni)
황윤석,김진태,문선경,이순걸,박용기,박종철,Yunseok Hwang,Kim, Jin-Tae,Sunkyung Moon,Lee, Soon-Gul,Park, Yong-Ki,Park, Jong-Chul 한국초전도학회 2001 Progress in superconductivity Vol.2 No.2
The effect of annealing step-edges of LaAlO$_3$ and MgO single crystal substrates on YBa$_2$Cu$_3$O$_{7}$ junction has been studied. The step-edge was fabricated by argon ion milling and was annealed at 105$0^{\circ}C$ in 1 attn oxygen pressure. We compared AFM image near step-edge of the substrates between before and after annealing process. And YBa$_2$Cu$_3$O$_{7}$ thin film was deposited on the step-edge by a standard pulsed laser deposition. The step-edge junctions were characterized by current-voltage curves at 77 K. The annealing of step-edges of MgO substrate improved the current-voltage characteristic of Josephson junction: double steps in the current-voltage characteristic disappeared. However the annealing for LaAlO$_3$ did not improve the junction property.rty.