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구연 / 제 4 회의장 / 간 4 : 비대상성 B 형 간경변증 환자들에 대한 장기간 Iamivudine 치료효과
박태옥(T . W . Park),박영민(Y . M . Park),배시현(S . H . Bae),변병훈(B . H . Byun),윤승규(S . K . Yoon),안병민(B . M . An),한준열(J . Y . Han),이창돈(C . D . Lee),차상복(S . B . Cha),정규원(K . Y . Chung),선희식(H . S . Sun),박두호(D . 대한소화기학회 1999 대한소화기학회 추계학술대회 Vol.1999 No.-
신명철,지광구,한준현,미서군 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1
Temperature response is tested for a Ni-Ti shape memory spring with prestrain or a constant load. An apparatus for measuring variation in deflection of the spring with temperature and DSC are employed to evaluate the characteristics. Localized elastic stress, accumulating on thermo-mechanical cycling, give rise to excess recovery, i.e., continuance of shape change at temperatures well above Af. The accumulation of even apparently elastic stress concentration can initiate dislocation slip, causing a SMA spring to lose its precision. Thus it is strongly advised that SMA thermo-actuator be cycled until no further permanent is induced, before its parameters are evaluated for designing.
스퍼터링한 반금속 Bi 박막의 미세조직과 자기저항특성에 미치는 후열처리의 영향
전민홍,장준연,한석희,한준현,이우영 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.7
We explore the possibility of sputtered Bi thin film applicable for the spin device by investigating the change in microstructure and magneto-resistance (MR) of post-annealed Bi film. Randomly oriented fine grains of which size was measured to about 100 nm (nano meter) were found in as-sputtered Bi. Careful annealing done at only 1.4℃ below the melting temperature of Bi results in not only grain growth up to 1.2 pm but also textured grains well aligned to [003] preferred orientation of Bi. The MR for as-sputtered Bi film was hardly observed regardless of measuring temperature, whereas those of annealed were found to reach 30,000% at 4 K and 600% at 300 K respectively. The drastic change in MR after annealing is largely attributed to the significant grain growth decreasing grain boundary scattering as well as to the trigonal-axis oriented microstructures diminishing anisotropy scattering of moving electron. Our results demonstrate sputtered Bi thin film can be usable for spintronic devices by employing a suitable post annealing treatment. (Received March 29, 2004)