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Design and Fabrication of High Temperature Superconducting Rapid Single Flux Quantum T Flip-Flop
김준호,김상협,정구락,강준희,성건용,Kim, J. H.,Kim, S. H.,Jung, K. R.,Kang, J. H.,Syng, G. Y. 한국초전도학회 2001 Progress in superconductivity Vol.3 No.1
We designed a high temperature superconducting rapid single flux quantum(RSFQ) T flip-flop(TFF) circuit using Xic and WRspice. According to the optimized circuit parameters, we fabricated the TFF circuit with $Y_1$$Ba_2$Cu$_3$$O_{7-x}$(YBCO) interface-controlled Josephson junctions. The whole circuit was comprised of five epitaxial layers including YBCO ground plane. The interface-controlled Josephson junction was fabricated with natural junction barrier that was formed by interface-treatment process. In addition, we report second design for a new flip-flop without ground palne.e.
김준호,박종혁,김상협,정구락,강준희,성건용,한택상,Kim, J. H.,Park, J. H.,Kim, S. H.,Jung, K. R.,Kang, J. H.,Sung, G. Y.,Hahn, T. S. 한국초전도학회 2001 Progress in superconductivity Vol.3 No.1
We have fabricated a single flux quantum 4-stage shift register with interface-controlled $Y_1$$Ba_2$$Cu_3$$O_{7-x}$(YBCO) Josephson junction. The YBCO Josephson junctions showed RSJ-like current-voltage(I-V) curves at temperatures 45~80K. We tested load and shift operation of shift register with binary data sequences “1000”, “1010”, “1011”, and “1111” at 58K. For all the binary data sequences, the shift register operated successfully. By operating the circuit with proper current pulses, we observed no errors during at least 12 hours operation for all the data sequences.s.
김준호(J. H. Kim),하태권(T. K. Ha) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
High temperature ageing behavior of heat-resisting duplex stainless steel for retort used in Pidgeon process for Mg production was investigated in this study. 25Cr-8Ni based duplex stainless steels were cast into rectangular ingots of which the dimension was 350×350×100mm³. Nitrogen and Yttrium were added up to 0.4 weight per cent. Phase equilibrium was calculated using the thermodynamic software FactSage® and the database of FSStel. For comparison, 310S steel, widely used heat-resisting austenitic stainless steel, was also cast in this study. Addition of N and Y had no effect on the thermal expansion behavior. High temperature tensile and compression tests were conducted on the ingots at 1230℃, which is operation temperature employed for Mg production by Silicothermic reduction. The steel with N and Y showed much higher strength than 310S in both tensile and compression tests. By thermal exposition at 1230℃ for 64 hrs, hardness of duplex stainless steel containing N and Y was found to increase, while that of 310S decreased.
김준호(J. H. Kim),민석홍(S. K. Min),문정호(J. H. Moon),하태권(T. K. Ha) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Single crystals of pure Magnesium, Mg-1 Y, and Mg-1Ce alloy were successfully fabricated in this study by employing the modified Bridgman method. To determine the exact orientation of crystals, Laue back-reflection method and pole figure measurement were carried out on each single crystal. Dimensions of single crystals were 10 mm in diameter and 120 mm in length. Hardness and compression tests were conducted and the results revealed that hardness and the strength strongly depended on the orientation. The closer to basal one the orientation was, the higher hardness and compressive strength were. The effect of alloying was not higher than that of orientation. After compressive deformation of single crystals, the orientation of the crystals was found to rotate and to be parallel to the basal orientation. In this study, the anisotropic diffusion behavior of Al and Zn in Mg was also investigated using diffusion couple technique with single crystal of pure Mg at the temperatures ranging from 365 to 420℃ for Al and from 280 to 330℃ for Zn. The diffusion coefficients of Al and Zn within the basal plane are about 1.3 and 1.23 times, respectively, greater than that along normal direction of basal plane at the experimental temperatures.