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저잡음 심자도측정시스템 개발을 위한 고온초전도 SQUID 센서의 제작
김인선,유권규,박용기,Kim I. S,Yu K. K,Park Y. K 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
YBCO do superconducting quantum interference device (SQUID) magnetometers based on bicrystal Josephson junctions on 10 mm ${\times}$ 10 mm $SrTiO_3$ substrates have been fabricated. The pickup coil of the device was designed to have 16 parallel loops with 50-fm-wide lines. We could obtain optimised direct coupled YBCO SQUID magnetometer design with field sensitivity $B_{N}$ $\Phi$/ of $4.5 nT/\Phi_{0}$ and magnetic field noise $B_{N}$ of about $22 fT/Hz^{1}$2/ with an I/f corner frequency of 2 Hz measured inside a magnetically shielded room. Preliminary results of magnetocardiograph measurement using the HTS SQUID magnetometers show signal to noise ratio of about 110, which is comparable to the quality of a commercial MCG system based on Nb-SQUIDs.
김인선,안산,권혁찬,송종현,Kim, I.S.,Ahn, San,Kwon, H.C.,Song, J.H. 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
We have developed a high-$T_c$ SQUID magnetocardiogram (MCG) system for small laboratory animals. White noise of the measurement system was about 30 fT/$Hz^{1/2}$ when measured in a magnetically shielded room. We optimized the measurement position to obtain clear MCG wave from rat's small heart by using grid measurements. With the optimization, the MCG signal was successfully detected with the peak amplitude of about 30 pT. We could observe well defined P-, QRS-, and T-waves from the rat MCG. The results suggest that the developed system has a strong potential to monitor the progress of the heart disease model by using a laboratory rat.
YBCO SQUID 자력계를 이용한 자기심장검사장치 개발
김인선,오수호,임현균,이용호,이순걸,박용기,Kim, I.S.,Oh, S.H.,Lim, H.K.,Lee, Y.H.,Lee, S.G.,Park, Y.K. 한국초전도학회 2007 Progress in superconductivity Vol.8 No.2
YBCO do superconducting quantum interference device (SQUID) magnetometers based on bicrystal junctions have been fabricated for magnetocardiograph (MCG) measurements. We could fabricate YBCO SQUID magnetometers having magnetic field noise of about $20fT/Hz^{1/2}$ at white noise region. We have developed an MCG system employing the high performance SQUID magnetometers. The lightweight MCG system, requiring liquid nitrogen as a coolant, consists of 6-channel SQUID sensors, an adjustable patient bed with sliding motion, and data analyses software. The MCG system could record quite clear MCG signals in a room with moderate magnetic shielding. In normal operation with multi-position MCG measurements, we could obtain clear 48-point mappings of magnetic field map and current source map with high enough signal qualities far clinical trials.
순수유체와 다공성물질의 경계면에서 압력구배의 수치적 처리에 관하여
김인선(I. S. Kim),남진현(J. H. Nam),김찬중(C.-J. Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
The objective of this study is to present a numerical treatment of the pressure gradient when control volumes are sharing the interface between a homogeneous fluid and a porous medium. Two possible approaches, e.g. linear interpolation and extrapolation, are considered, and they are applied to the case of a steady and two-dimensional curved channel flow which is partially filled with a porous medium. It was found that the linear extrapolation produces a continuous velocity field at the interface and thus is recommended. On the contrary, the linear interpolation entails a discontinuous velocity field at the interface, thereby warning its use in connection with the Brinkman-Forchheimer-extended Darcy flow model.
순수유체와 다공성물질의 경계면에서 압력구배의 수치적 처리에 관하여
김인선(I. S. Kim),남진현(J. H. Nam),김찬중(C.-J. Kim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
The objective of this study is to present a numerical treatment of the pressure gradient when control volumes are sharing the interface between a homogeneous fluid and a porous medium. Two possible approaches, e.g. linear interpolation and extrapolation, are considered, and they are applied to the case of a steady and two-dimensional curved channel flow which is partially filled with a porous medium. It was found that the linear extrapolation produces a continuous velocity field at the interface and thus is recommended. On the contrary, the linear interpolation entails a discontinuous velocity field at the interface, thereby warning its use in connection with the Brinkman-Forchheimer-extended Darcy flow model.
김지은,김인선,강찬석,권혁찬,김진목,이용호,김기웅,Kim, J.E.,Kim, I.S.,Kang, C.S.,Kwon, H.,Kim, J.M.,Lee, Y.H.,Kim, K. 한국초전도학회 2011 Progress in superconductivity Vol.13 No.1
We developed a four-channel first order gradiometer system to measure magnetoencephalogram for mice. We used double relaxation oscillation SQUID (DROS). The diameter of the pickup coil is 4 mm and the distance between the coils is 5 mm. Coil distance was designed to have good spatial resolution for a small mouse brain. We evaluated the current dipole localization confidence region for a mouse brain, using the spherical conductor model. The white noise of the measurement system was about 30 fT/$Hz^{1/2}$/cm when measured in a magnetically shielded room. We measured magnetic signal from a phantom having the same size of a mouse brain, which was filled with 0.9% saline solution. The results suggest that the developed system has a feasibility to study the functions of brain of small animals.