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채기병,장기성,소대화 明知大學校 産業技術硏究所 1990 産業技術硏究所論文集 Vol.9 No.-
In this study, a new sintered specimens of Y₁-xSmxBa₂Cu₃Oy is composed by substituting Sm for a part of Y in the YBa₂Cu₃Oy high Te superconductor. in order to study of making (Y-Sm)-Ba-Cu-O system sintered specimens and their characteristics. And their change affected on superconductivity and their characteristics are studied by changing the x range of the composition rate. The resistances of electrical characteristics under the conditions of the composition and the temperature are measured by using Ac four probe method in the procedure of this. experiments. And it is confirmed that the Meissner effect from the superconductivity of compose S m system exists in the range of 0 < x 0.5. As for the type of the grain structure, by the SEM photographs, it is observed that the grain structures of the superconductors are formed into the stick type.
채기병,소대화,강기성 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
The superconducting thin films have ben deposited on the SiOx substrate by R.F magnetron sputtering using YBa₂Cu₃Ox single target. The thickness of films was 1000-2000Å with a rate of 20-25Å/min and superconducting properties were studied of thin films depend on the compositions. We have studied the superconducting thin films obtained under the various conditions in this sputtering method of fabrication and aiso analyzed SEM photograph and X-ray diffraction patterns of calcination powder to target and the thin films have an influence in addition. We could measure the annealing condition and the electric properties of superconducting thin films owing to substrate about 50K.
양자교환 방식에 의한 방향성 결합기의 제작 및 특성연구
소대화,채기병,강기성,윤형도 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-
In this study, a directional coupler which is fabricated on X-cut LiNbO₃ substrate by using proton exchange method is described. It is found that the directional coupler waveguide varied widely with controlling diffusion process. On the other hand, the on-off state of modulator is performed by annealing process and self-aligned electrodes are used in fabricating the direction coupler. As a results, the direction coupler has good characteristics : the measured on-off switching voltage of about 2.7-3V.
강기성,채기병,소대화,박정철 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-
In this paper, we calculate refractive index change of optical waveguide and electric field to simulate y-cut LiNbO₃optical waveguide at He-Ne laser (λ=0.6328[㎛]) by BPM mechanism. At waveguide width of 4[㎛], buffer layer of 0.02[㎛] of LiNbO₃ substrate (XI 55[㎛] x ZI 5000[㎛], we observed electric field Ex, Ey in x, y-direction. By applying these parameters of single waveguide to simulate a X-switch, we have chosen index change of 0.002, width of 3[㎛] and angle of 0.4。∼0.6°of optical waveguide and under these conditions, optical beam propagates cross-side at 0.4° When applied switching vlotage of 25[V], optical beam of X-switch turns cross-side to bar-side at intersection angle 0.4° index change of 0.002, wavegulde width of 3[㎛], electrode gap 2[㎛]. By the above results, we can obtain the basis design conditions of X-switch optical modulator. And optical single waveguide is fabricated on the y-cut LiNbO₃ single crystal substrate by Ti-indiffusion method. The line-width of the waveguide was made from 4[㎛] to 6[㎛]that observed single mode at 4[㎛] as a result of propagation of He-Ne(0.6328[㎛]) laser beam.
RIETAN 시뮬레이션에 의한 YBCO 초전도체 결정구조 전이에 관한 연구
이상운,채기병,소대화 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
In this study, we have tried to focus on the practical use of YBCO high temperature superconductor as an excellent part in electronic field. When we verify the characteristic improvement of superconductance and accurate reproduce and so forth, we made use of RIETAN, we changed the lattice constant and oxygen content from 6.0 to 7.0 as for the transition of orthogonal structure and tetragonal structure at superconductor, at the result we proved that transition from tetragonal structure to orthogonal structure was made at the point of 6.6(oxygen content) by using the simualtion. In addition, we proved that the transition peak of structure is transient from 2θ=32.587。 to 2θ =32.908。 at the tetragonal peak. and is transient from 2θ=32.877。 to 2θ= 32.908。. at the tetragonal peak. Also, major oxygens are located at O(2) and O(3) at tetragonal structure and are located at O(3), O(4), and O(5) at orthogonal structure, when tertagonal structure is converted into orthogonal structure. At the result of above passage, we verified that the transition point of oxygen-ion orthorhombic critical Point is 6.6.
강기성,소대화,채기병 明知大學校 産業技術硏究所 1993 産業技術硏究所論文集 Vol.12 No.-
We performed theoretical simulation for directional coupler using BPM program. Simulation results showed that the optimum optical waveguide width and the gap between the guides were 4μm. Using the parametes of n₁=2.25, n₂=2.25, n₃=2.2, gap=4μm, W=30μm, Z=0.1μm, λ=1.5m, we decided other design parametes. Proton exchange of proton diffusion method was applized to pattern a waveguide on a LiNbO₃ substrate.