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Novel Semiconductor Devices for High Speed VLSI and Ultra-High Frequency Applications
Shur,Michael S.,Lee,Kwy Ro,Peatman,William C. B.,Gelmont,Boris 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
We discuss novel device structures which may present an alternative to conventional technology choices for ultra-high speed integrated circuits. These devices include n-HFETs, Dipole HFETs, complementary HFETr (C-HFETs), split-gate and Variable Threshold voltage HFETs (VTHFETs), Tunneling Emitter Bipolar Transistors (TEBTs), and heterodimensional transistors. π-HFETs are most suitable far digital VLSI applications, C-HFETs hold promise of low power VLSI. Splitgate FETs and Tunneling Emitter Bipolar Transistors devices may find applications in millimeter and submillimeter range. Heterodimensional Transistors have a potential of ultra-low power applications.
Shur, J. W.,Lee, H. J.,Yoon, D. H. WILEY-VCH Verlag 2010 Crystal research and technology Vol.45 No.2
<P>Crack-free, rod-shaped single crystals of undoped and 0.5, 0.7 and 1.0 mol% ZrO<SUB>2</SUB>-doped LiNbO<SUB>3</SUB> with a near-stoichiometric composition were grown by the micro-pulling down (μ-PD) method. The structural properties of the grown crystals were examined by powder X-ray diffraction (XRD). Electron probe micro analysis (EPMA) of the near-stoichiometric LiNbO<SUB>3</SUB> single crystals revealed the homogeneous incorporation of Zr ions. The change in the refractive index and IR transmission spectra of the grown crystals were examined as a function of the Zr concentration. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
단열 ZrO2 Coating 의 내구성에 미치는 NiCrAl 조성의 영향
서동수 ( D . S . Shur ) 대한금속재료학회 ( 구 대한금속학회 ) 1987 대한금속·재료학회지 Vol.25 No.2
The present study examined influence of oxygen-active elements in the bond coating of thermal barrier coating on a nickel-base superalloy. Utilizing plasma spray techniques, bond coating of Ni-Cr-Al alloys containing various additions of Zr, Y, Hf and Si were coated on a substrate and, then, ceramic layer of ZrO2(Y2O3-stabilized) was coated. After static exposure at 1200℃, Al-depleted zones were formed at the ceramic coating side due to selective oxidation of Al and at the substrate side due to interdiffusion of Al. Cracks appeared to initiate at the Al2O3-bond coating interface, and to propagate into the ceramic coating. Resistance against cracking increased in the order of Y-, Zr- and Hf-addition in the bond layer, while additional Si always improved the cracking resistance.
Al-8%Mg 合金의 機械的 性質에 미치는 加工熱處理의 影響
徐昌濟 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.1
The tensile and toughness tests were made on the Al-8%Mg alloy aged at 200℃ for various periods after aging at 150℃ for 24 hr followed cold rolling by 0, 30 and 50%. Behaviors of micro-shrinkage during rolling were correlated mechanical properties. Rolling in the reduction ratio from 30%, or more ensured a satisfactory repairing effect on the micro-shrinkages and good properties. The two step aging is not effective, but the thermo-mechanical treatment is effective in strengthening; of the alloy. The effect of theromo-mechanical treatment is due to synergetic effect of refining the structure of precipitates and presence of dislocations.
서정훈,최은아 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.4
본 연구는 열을 이용한 금속 브라켓의 재생 처리시, 기저부 형태와 브라켓 재생 방법에 따른 전단접착강도 및 브라켓 탈락 양상을 비교하고자 시행되었다. 교정 치료를 위해 발거된 건전한 소구치 252개를 수집하고, Type I, Type II, Type III 스탠다드 브라켓을 각각 재생 방법에 따라 네 군으로 나누어 준비된 소구치에 접착하고, Instron Universal Testing Machine(Model 4466)으로 전단접착강도를 측정하였으며, 브라켓의 타락 양상을 관찰하고 브라켓 기저부의 주사전자현미경 소견을 관찰하였다. SP SS 통계처리 프로그램을 이용하여 일원분산분석(oneway ANOVA), Scheffe`s multiple range test를 실시하여 다음과 같은 결론을 얻었다. 1. 브라켓 기저부 형태에 따른 전단접착강도는 유의차가 있었으며(P<0.001), 그 크기는 Type III(round indentation, micro-etched base), Type I(foil-mesh base), Type II(grooved integral base, micro-etched)의 순이었다. 2. 재생 방법에 따른 전단접착강도는, Type I, Type II 브라켓에서는 Big Jane에 1분간 처리시 우수한 결과를 보였고(p<0.05), Type III 브라켓에서는 각 군간 유의한 차이를 보이지 않았다.(p>0.05). 3. Type I, Type II 브라켓은 기저부-레진 계면에서 가장 높은 빈도로 탈락하였고, Type III 브라켓에서는 레진의 절반가량이 치면에 잔존하는 탈락 양상이 가장 많았다. 4. 탈락 양상에 따라 탈락시의 전단접착강도가 유의성 있는 차이를 보였는데(p<0.05), 브라켓 탈락시 접착제의 절반가량이 치면에 잔존하는 경우 전단접착경우가 가장 큰 것으로 나타났다. 5. 브라켓 재생 후 기저부에 남아 있는 접착제는 전단접착강도의 감소에 영향을 미치지 않았다. This study was undertaken to compare the bond strength and the fracture site of new and recycled brackets according to the base design. 252 sound premolars extracted for orthodontic treatment were collected, and Type I, Type II, Type III brackets were divided into four groups by recycling method. Each bracket was then bonded to an extracted premolar. Instron Universal Testing Machine(model 4466) was used to measure the shear bond strength, and the surface of the recycled brackets were viewed in SEM. For the analysis of the results, one way ANOVA and Scheffe`s multiple range test was executed using the SPSSWIN program. 1. The shear bond strength showed statistically significant difference according to the bracket base design (P<0.001). Type III bracket(round indentation base, micro-etched) showed the highest bond strength, Type I bracket(foil-mesh base) was second, and Type II bracket(grooved integral base, micro-etched) was last. 2. The effect of recycling on the bond strength was different according to bracket type. The shear bond strength of Type I, Type II brackets showed the smallist reduction when treated for 1 minute in Big Jane(p<0.05), but the shear bond strength of Type III brackets showed no statistically significant difference according to recycling method(p>0.05). 3. In Type I, Type II brackets, frequent fracture site was bracket-resin interface, but in Type III brackets, about half of the resin was retained on the tooth surface frequently. 4. The shear bond strength was highest when about half of the resin was retained on the tooth surface(p<0.05). 5. The resin remnant on the bracket base after recycling had no effect on the shear bond strength.
徐昌濟 成均館大學校 1983 論文集 Vol.33 No.-
In the dendrite structures of unidirectionally and freely solidified Al-Cu and Al-Mg alloys, the effect of cooling rate on microsegregation and the solution kinetics of nonequilibrium second phase were studied by means of X-ray diffraction and method of point count. The main conclusions obtained are as follows; 1) It was found that lattice parameter (a) of alloys change with only the cooling rate without the solidification modes and the kind of alloys. 2) As the cooling rate increases, the solute content in the Al matrix increases while the amounts of nonequilibrium second phase decreases. 3) Nonequilibrium second phase is limited the primary dendrite arm spacing in the later stages of solution treatment. 4) The dissolution time of nonequilibrium second phase is propertionated the square of primary dendrite arm spacing.