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고 자장에서 Dynamic Susceptibility Contrast 효과에 관한 연구 : Gradient EPI와 Spin-EPI기법의 비교
구은회,채홍인,박종배,임청환,김정구,Goo, Eun-Hoe,Chae, Hong-In,Park, Jong-Bae,Im, Cheong-Hwan,Kim, Jeong-Koo 대한디지털의료영상학회 2007 대한디지털의료영상학회논문지 Vol.9 No.2
We have evaluated and compared of gradient echo and spin echo EPI for compensating about deeply distortion aspect in case of post-operation patients in magnetic resonance image. A total of 100 patients were performed on 3.0 T(GE Signa Excite E2, USA) with 8ch head coil. As a result of analysis, The SNRs of whiter and gray matter areas were 36.74 $\pm$ 06 and 39.96 $\pm$ 09 in the gradient echo EPI, the SNRs which white and gray matter areas were slightly higher than gradient echo EPI(P<0.005, paired student t-test). It was 46.24 $\pm$ 11 and 51.38 $\pm$ 13 in gradient and spin echo EPI, respectively. The signal intensity in the whiter and gray matter areas also were 87.33 $\pm$ 15.24 and 140.66 $\pm$ 13.45 in the gradient echo EPI techniques, The signal intensity of gradient echo EPI showed higher values compared to spin echo EPI. Otherwise, gradient echo EPI technique is distortion enough to operation wound and edge of the image, while spin echo EPI technique did not appear almost. In this point, the spin echo EPI technique, after surgical operation according to patient state beside gradient echo EPI techniques that signalbeside gradient echo EPI techniques that signal intensity is high and patient's case which image distortion is serious by metal etc, will be provide the useful information in adults and pediatric patients.
Pb complex perovskite 계 세라믹의 유전특성
채홍인,임기조,이정구,유영각 ( Hong In Chae,Kee Joe Lim,Jeong Gu Lee,Young Kag Yoo ) 충북대학교 산업과학기술연구소 1990 산업과학기술연구 논문집 Vol.4 No.2
Abstract_Roman In this study, we suggest new dieler:tric cornposition and their preparing rnethod The dielectric compositions which is compri*sed PMN-PZN-PLiW can be fired at a temperature between 1000 1050 C and ean thus be used with high silver cooten
디스크형 압전변압기의 전극 면적비에 따른 구동 메카니즘에 관한 연구
이종필,채홍인,홍진웅,Lee, Jong-Pil,Chae, Hong-In,Jin, Woong-Hong 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.5
본 연구에서는 직경이 50[mm], 두께가 4.5[mm]인 디스크형 압전 변압기의 구동부와 발전부의 전극 면적비를 각각 1.4:1, 2:1 및 3:1로 분할하여, 부하 저항을 변화(100${[\Omega]}\~70{[k\Omega]}$)시키면서 전기적 특성을 측정하고, 이를 토대로 한 압전변압기의 승압비에 관한 메카니즘을 정량적 및 정성적으로 해석하였다. In this study, a disk-type piezoelectric transformer was fabricated. Its diameter was 50[mm] and thickness was 4.5[mm]. The driving and generating electrode with their gap of 1[mm] were fabricated on the top surface. But the common electrode was fabricated on the whole bottom surface. The electrode surface ratio of driving and generating part on the top surface was the range of 1.4:1 to 3:1. We investigated the electrical characteristics with the variation of its thickness and the electrode surface ratio of driving and generating part in the range of load resistance of 100${[\Omega]}\~70{[k\Omega]}$.. Form the experimental results, their influence on the set-up voltage ratio were investigated quantitively and qualitatively.