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소 동물 <sup>1</sup>H 1.5 T 자기공명영상 장치용 유연인쇄기판 기반 새장형 수신 코일 센서
세이크 파이잘 아마드,김현덕,Ahmad, Sheikh Faisal,Kim, Hyun Deok 한국센서학회 2017 센서학회지 Vol.26 No.4
A novel method to implement a birdcage-type receiving coil sensor for use in a magnetic resonance imaging(MRI) system has been demonstrated employing a flexible printed circuit board (FPCB) fabrication technique. Unlike the conventional methods, the two-dimensional shape of the coil sensor is first implemented as a FPCB and then it is attached to the surface of a cylindrical supporting structure to implement the three-dimensional birdcage-type coil sensor. The proposed method is very effective to implement object-specific MRI coil sensors especially for small animal measurements in research and preclinical applications since the existing well-developed FPCB-based techniques can easily meet the requirements on accuracies and costs during coil implement process. The performances of the coil sensor verified through $^1H$ 1.5T MRI measurements for small animals and it showed excellent characteristics by providing a high spatial precision and a high signal-to-noise ratio.
반무한 전기 쌍극자층에 의한 정전계 해석과 앙페르 법칙에 자계와 커패시터의 누설 전계간의 이중성 유사 관계
조영기(Young Ki Cho),Sheikh Faisal Ahmad,손혁우(Hyeok Woo Son),김현덕(Hyun Deok Kim),유형석(Hyoungsuk Yoo) 대한전기학회 2012 전기학회논문지 Vol.61 No.4
The similarity, analogy and equivalence between the phenomenon due to electric and magnetic dipoles have been discussed in the open literature for different situations. Here we are presenting the numerical proof of the trajectory of leakage electric field due to a semi-infinite electric dipole layer in the external periphery and the electric field in the space between oppositely charged surfaces. The result is also valid for the fringing electric field of a parallel plate capacitor. The result is also proved to be a dual of Ampere’s law in the electrostatics due to a semi-infinite electric dipole layer.
김영철 ( Young Cheol Kim ),세이크파이잘아마드 ( Sheikh Faisal Ahmad ),김현덕 ( Hyun Deok Kim ) 한국센서학회 2017 센서학회지 Vol.26 No.2
A novel intravenous (IV) infusion monitoring sensor is presented to measure the drop rate in the drip chamber of an IV infusion set. It is based on a capacitive proximity sensor and detects the variation of the longitudinal electric field induced by the drop falling into the drip chamber. Unlike the conventional capacitor sensor with two semi-cylindrical conductor plates, the proximity sensor for IV monitoring is composed of a pair of conductor rings which are mounted on the outer surface of the drip chamber with a specific gap between them. The characteristics of the proximity sensor for IV monitoring were investigated through three dimensional electrostatic simulations. It showed quite superior performances in comparison with the conventional capacitor sensor. Especially, the proposed proximity sensor exhibits consistent sensitivity regardless of its mounting position on the drip chamber, operates normally though the drip chamber is tilted and shows robustness to the changes of the drop size and the drip factor of the IV infusion set. Thus, the proximity sensor for IV monitoring is more suitable for use in actual environment of IV therapy compared with the conventional capacitor sensor.