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분무 열분해법으로 제조된 미세 Bi-2223 전구분말의 특성
김성환,유재무,고재웅,김영국,Kim S. H.,Yoo J. M.,Ko J. W.,Kim Y. K. 한국초전도학회 2005 Progress in superconductivity Vol.6 No.2
Homogeneous and fine powders for Bi-2223 tape were prepared by ultrasonic spray pyrolysis (SP) method from an aqueous solution of metal nitrates. Bi-2223 precursor powders were synthesized with various solutes concentration and pyrolysis temperature. The synthesized precursor powders had a narrow particle size distribution and an average particle size was $\~{\cal}um$. The reactivity of precursor powder by SP method is very high, attributed to the fine and narrow particle size distribution. Bi-2223/Ag tape was prepared using PIT method and followed by various sintering conditions. The precursor powder by SP method promoted a very quick formation of the Bi-2223 phase for short sintering time while the secondary phase such as large AEC phase and $Ca_2PbO_4$ were minimized for SP tapes.
김성환(S.H. Kim),박진수(J.S. Park),박호철(H.C. Park),김동진(D.J. Kim),박명철(M.C. Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The precise alignment of two glasses is a typical procedure in LCD or OLED assembly. For this process, the vision system evaluates position errors between glasses by detecting the pattern markers printed in each glass and the X, Y, R stage moves one glass to another in order to correct the error. Commonly used 2-D moving stage, called the 4-Axes Parallel Stage, has 3 motors at each corner which respectively move in X1, X2, Y or X, Y1, Y2 direction. In this stage, 3 axes motions combine to make the X, Y, R motion. Therefore the required 3 axes feed need to be calculated from the X, Y, R errors using inverse kinematics. But the inverse kinematics conversion has too many possible cases because of the diversity in stage configuration such as the motors positions and directions. In this work, the multi purpose stage is designed to transform into any configuration that can occur in practical application. When the new configuration stage is designed, inverse kinematics conversion is derived and verified in desktop environment using multi purpose parallel stage. Through this work, stage control system can be developed more efficiently.
김성환(S. H. Kim),허민웅(M. W. Heo),박원규(W. G. Park),정성해(S. H. Jung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A solver for icing and condensation of water has been developed. The phase change process was solved by the enthalpy method. For the code validation, the temperature and the phase change from water to ice of the driven cavity were calculated. Also, the melting process of the frost on the windshield glass of an automobile has been simulated. The calculation showed a good agreement with analytical solution and other numerical results. Using the present validated code, the condensation of water vapor has been first tried. The computed results provided some physical features of condensation phenomena even though experimental data and other numerical data were not available. For future work, it is recommended to throughly investigate the effects of boundary conditions on the solution.