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박성창,임영진,강성구,정준기,김찬중,김철진,Park, S.C.,Lim, Y.J.,Kang, S.G.,Chung, J.K.,Kim, C.J.,Kim, C.J. 한국초전도저온학회 2008 한국초전도저온공학회논문지 Vol.10 No.1
Spherical $MgB_2$ powders was synthesized with the ultrasonic spray pyrolysis(USP) process using aqueous solutions of boron and magnesium ion. The properties of synthesized $MgB_2$ powder were characterized by XRD, SEM and EDS. A small amount of MgO was detected as the secondary phase out of the synthesized powder and the ratios of $MgB_2$ to MgO increased with increasing furnace temperature. The particle size and morphology of $MgB_2$ powder were investigated with varying molar concentration of the boron and magnesium solution and furnace temperature between $600^{\circ}C$ and $1000^{\circ}C$ in $Ar/H_2$. The average particle size of $MgB_2$ showed narrow distribution ranging from 300nm to 400nm. The morphology of particles exhibited mostly spherical shapes and uniform distribution.
다양한 산소분압에서 소결한 NdBCO 초전도체의 열적 안정성
정준기,김원정,박성창,강성구,임영진,김철진,Chung, J.K.,Kim, W.J.,Park, S.C.,Kang, S.G.,Lim, Y.J.,Kim, C.J. 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
The $Nd_{1+x}Ba_{2-x}Cu_3O_{7-{\delta}}$(Nd123) superconductor exhibits high performance in high magnetic field and high temperature. We have studied phase stability for Nd123 under reduced oxygen partial pressure and various heat-treatment conditions. The main phase is Nd123 and some samples contain small amounts of Nd422 depending on the temperature and oxygen partial pressure. The decomposition temperature decreases with decreasing oxygen partial pressure from $1052^{\circ}C(P(O_2)$=150 Torr) to about $845^{\circ}C(P(O_2)$=0.1 Torr). The liquidus line was steeper temperature with decreasing oxygen partial pressure. In same condition of oxygen partial pressure, the region of stable Nd123 phase was formed at slightly higher temperature than the region of stable YBCO phase.
Row Driver 회로가 집적된 2.2-inch QCIF+ a-Si TFT-LCD
윤영준,한승우,정철규,정경훈,김하숙,김서윤,임영진,Yun, Y.J.,Han, S.W.,Jung, C.G.,Chung, K.H.,Kim, H.S.,Kim, S.Y.,Lim, Y.J. 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.3
A 2.2-inch QCIF+(176${\times}$RGB${\times}$220) TFT-LCD with integrated row driver was developed using a standard amorphous silicon TFT technology. At low temperature, the integrated row driver operation is dramatically effected by the electron drift mobility reduction(■50 %) and the threshold voltage shift (■1V) of the a-Si TFT. We studied the dependency of circuit design and found that higher on-current circuit is important to guarantee good operation in wide temperature range.
임영진,김국기,김태성,김광명,이봉암,임언 대한신경외과학회 1985 Journal of Korean neurosurgical society Vol.14 No.1
The authors present two cases of interesting intraventricular meningiomas. One of these is located in the left lateral ventricle of 26 years old female with no neurologic deficit, which has moderate vascularity. The other case is located in the right "lateral ventricle of 5 years old female with very large size" The preoperative diagnosis should be reached by means of both computerized tomography and carotid angiography. The selection of surgical approach is very important, especially in left lateral ventricular tumor, which is determined by neurologic deficit, vascularity of tumor and tumor size. Total removal has been accomplished by superior parietal approach in left lateral ventricular tumor and right temporal approach in child ventricular meningioma. Literatures concerned were reviewed.