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5.12 Te/s(128채널 × 43 Gb/s) WDM 신호의 전송실험
전상배,손의승,정승필,정윤철,Jun, S.B.,Son, E.S.,Jung, S.P.,Chung, Y.C. 한국광학회 2005 한국광학회지 Vol.16 No.2
We demonstrated 5.12-Tb/s($l28 ch \times 43 Gb/s$) WDM transmission over 200 km of medium dispersion fiber. The spectral efficiency was 0.8-(bits/s)/Hz. After transmission, the average Q-factor was measured to be 15.2 dB. 본 논문은 5.12-Tb/s(128 채널 ${\times} 43 Gb/s$) WDM 신호의 200 km 전송실험에 관한 것이다. 본 실험에서는 Medium Dispersion Fiber를 사용하여 0.8-(bits/s)/Hz의 스펙트럼 효율을 구현하였다. 전송 후 측정된 평균 Q-factor값은 15.2 dB이었다.
연속주조법으로 제조된 Cu-9Ni-6Sn 합금의 열처리 조건 및 냉간 swaging 량에 따른 기계적 특성의 변화
김창주,류재철,김상식,정윤철,한승전 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.9
In the present study, tensile properties of continuously cast and swaged Cu-9Ni-6Sn alloys were examined. Solutionized and aged Cu-9Ni-6Sn alloys, with 95% swaging, showed a multi-stage change in tensile strength with aging time, probably due to the sequential occurrence of spinodal decomposition, formation of γ' and recrystallization. The change in tensile strength with aging time for the aged specimens without solution heat treatment was, on the other hand, minimal. A complex interaction between the decrease in dislocation density, formation of equilibrium phases and refinement of Sn-rich phases is believed to be responsible for such a lean sensitivity. Spinodal decomposition in Cu-Ni-Sn alloys appears to be restricted with increasing the amount of cold deformation.
류재철,김상식,김창주,정윤철,한승전 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.8
In the present study, tensile properties of continuous casted Cu-9Ni-6Sn alloy, with and without 95% swaging, were examined as a function of continuous casting rates. A large amount of Sn-rich phases were observed in the interdendritic regions of as-casted Cu-9Ni-6Sn alloy, regardless of casting rates. The size and distribution of these phases, however, differ greatly with different casting rates, as well as the amount of Sn in the phase. Slower casting rate tended to increase the size of the phase, but the amount of Sn in the phase increased with faster casting rate. During solutionization, most of Sn-rich phase appeared to decompose into the solid solution. After aging, a significant amount of coarse precipitates were observed in the alloy produced at a casting rate of 280 ㎜/min. It is believed that such coarse precipitates were formed around the Sn-rich phases due to relatively high Sn content after solutionization. SEM fractographic studies indicated that coarse precipitates, as well as weak Sn-rich phases, act as sources for microvoid. Consequently, both tensile strength and elongation of solutionized and aged Cu-9Ni-6Sn alloy increased significantly with decreasing casting rate. Cold swaging greatly improved the tensile properties of Cu-9Ni-6Sn alloy due to the reduced and refined Sn-rich phases and coarse precipitates.