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유희욱,박강 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
This paper presents the algorithm and structure of a 3D dental model scanner that can obtain the 3D point data of the plaster dental model of human. Since the shape of dental model is complicated, the scanner is designed to have the measuring pose changing mechanism driven by three stepping motors. An automatic teaching algorithm is developed to automatically find the series of measuring poses (in terms of three angles of the stepping motors) and finally produce the optimal scanned data with minimal unscanned area. The dental model is designed as a parametric model that can change the position and the orientation of an individual tooth to match the model with the shape of patient's teeth.
다층 PCB에서의 $BaTiO_3$ 세라믹 Embedded capacitors
유희욱,박용준,고중혁,You, Hee-Wook,Park, Yong-Jun,Koh, Jung-Hyuk 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.2
Embedded capacitor technology is one of the effective packing technologies for further miniaturization and higher performance of electric packaging system. In this paper, the embedded capacitors were simulated and fabricated in 8-layered printed circuit board employing standard PCB processes. The composites of barium titanante($BaTiO_3$) powder and epoxy resin were employed for the dielectric materials in embedded capacitors. Theoretical considerations regarding the embedded capacitors have been paid to understand the frequency dependent impedance behavior. Frequency dependent impedance of simulated and fabricated embedded capacitors was investigated. Fabricated embedded capacitors have lower self resonance frequency values than that of the simulated embedded capacitors due to the increased parasitic inductance values. Frequency dependent capacitances of fabricated embedded capacitors were well matched with those of simulated embedded capacitors from the 100MHz to 10GHz range. Quality factor of 20 was observed and simulated at 2GHz range in the 10 pF embedded capacitors. Temperature dependent capacitance of fabricated embedded capacitors was presented.
RF 마그네트론 스퍼터법을 사용한 전도성 SrMoO<sub>3</sub> 박막 제조 및 전기전도특성 평가
유희욱,선호정,Ryu, Hee-Uk,Sun, Ho-Jung 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6
Conductive $SrMoO_3$ thin films were fabricated by RF magnetron sputtering with the powder-type sputtering target, and annealed for crystallization. When RTP (rapid thermal processing) in vacuum was applied, the fabricated thin films showed the mixed phases of $SrMoO_3$ and $SrMoO_4$, but $SrMoO_3$ phase could be promoted by the lowering of the working pressure during deposition. In order to eliminate $O_2$ gas during deposition and annealing, further lowering of the working pressure and furnace annealing in hydrogen atmosphere were tried. With the optimization of the deposition and annealing conditions, the thin film with nearly single-phase of $SrMoO_3$ was obtained, and it showed good electrical conduction properties with a low resistivity of $2.5{\times}10^{-3}{\Omega}{\cdot}cm$ at room temperature.