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RF Sputtering법으로 제조된 TiO<sub>2</sub> 박막의 광촉매 특성
정민호,진덕용,최대규,Jeong, Min-ho,Jin, Duk-yong,Hayashi, Y.,Choi, Dae-kue 한국재료학회 2003 한국재료학회지 Vol.13 No.3
Titanium dioxide films were prepared by RF sputtering method on glass for various oxygen partial pressures at power 270 W. The crystal structure, photocatalytic property and the hydrophilicity of $TiO_2$thin film the deposition conditions were investigated. Crystallized anatase phase was observed in $TiO_2$film deposited at the ratio of oxygen partial pressure 10% and 20% for 2 hrs. As the increase of deposition time, the grain size and void size of $TiO_2$film have increased and also $V_2$films have been good crystallinity. The ultraviolet-visible light absorption of $TiO_2$films was increased with increasing of deposition time and occured chiefly at the wavelength between 280 and 340 nm. The absorption band was shifted to a longer wave length as deposition time increased. Water contact angle on the X$TiO_2$film of anatase structure was decreased with increasing ultraviolet illumination time and became lower than $11^{\circ}$ from $83^{\circ}$. When hydrophilic $TiO_2$film changed by enough ultraviolet illumination was stored in the dark, the film surface gradually turned to hydrophobic state.
수열법으로 성장한 ZnO Nanorod/ZnO/Si(100)의 특성
정민호,진용식,최성민,한덕동,최대규,Jeong, Min-Ho,Jin, Yong-Sik,Choi, Sung-Min,Han, Duk-Dong,Choi, Dae-Kue 한국재료학회 2012 한국재료학회지 Vol.22 No.4
Nanostructures of ZnO, such as nanowires, nanorods, nanorings, and nanobelts have been actively studied and applied in electronic or optical devices owing to the increased surface to volume ratio and quantum confinement that they provide. ZnO seed layer (about 40 nm thick) was deposited on Si(100) substrate by RF magnetron sputtering with power of 60 W for 5 min. ZnO nanorods were grown on ZnO seed layer/Si(100) substrate at $95^{\circ}C$ for 5 hr by hydrothermal method with concentrations of $Zn(NO_3)_2{\cdot}6H_2O$ [ZNH] and $(CH_2)_6N_4$ [HMT] precursors ranging from 0.02M to 0.1M. We observed the microstructure, crystal structure, and photoluminescence of the nanorods. The ZnO nanorods grew with hexahedron shape to the c-axis at (002), and increased their diameter and length with the increase of precursor concentration. In 0.06 M and 0.08 M precursors, the mean aspect ratio values of ZnO nanorods were 6.8 and 6.5; also, ZnO nanorods had good crystal quality. Near band edge emission (NBE) and a deep level emission (DLE) were observed in all ZnO nanorod samples. The highest peak of NBE and the lower DLE appeared in 0.06 M precursor; however, the highest peak of DLE and the lower peak of NBE appeared in the 0.02 M precursor. It is possible to explain these phenomena as results of the better crystal quality and homogeneous shape of the nanorods in the precursor solution of 0.06 M, and as resulting from the bed crystal quality and the formation of Zn vacancies in the nanorods due to the lack of $Zn^{++}$ in the 0.02 M precursor.
유체 토크 컨버터를 이용한 정회전 정출력 풍력발전시스템 연구 및 개발
이인열(In-Yol Yi),이강일(Kang-Il Lee),심충무(Choong-Moo Shim),최대규(Dae-Kue Choi),임재규(Jae-Kyoo Lim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11
Most of existing wind turbine system is used with geared type; however, this type has lots of problems which are noisy, weight, maintenance and so on. In this paper, wind turbine system with fluid torque converter applied to solve these problems. In case of the proposed wind turbine system, it is possible to transmit torque to adaptable distance. So various sets including generator, inverter and auxiliary motor move from the nacelle to the ground. As a result, Total weight in Nacelle can be decreased. however, the efficiency can be decreased with fluid tourque system.. We also applied auxiliary motor to fluid touque system . So, we also realized rated revolutions and rated output windturbine and could get considerable good data.
최대규,설경원 전북대학교 공업기술연구소 1984 工學硏究 Vol.15 No.-
금속의 일방향 응고시 금속주형과 응고 금속내의 온도구배외 계면에서의 열저항의 존재유무에 따라 응고특성을 4가지 Model을 정하여 조사하였다. 계면에서의 열유동과 열전달계수등을 계산하고 이론적으로 응고시간, 응고두께 및 속도 등을 나타내는 수식을 유도하였다. 또한 과열된 용융금속을 금속주형에 주입할 때 응고시간에 미치는 영향을 사형의 경우와 비교하여 조사하였다.
崔大奎 전북대학교 공업기술연구소 1982 工學硏究 Vol.12 No.-
The elimination of lead in crude Bismuth was studied by adding CuCl_2 to molten metal through exchange reaction. In the temperature range from 300℃ to 550℃ the chemical equation of the exchange reaction was found to be : 2CuCl_2 +Pb = 2CuCl + PbCl_2 and there was found a side reaction also, 3CuCl_2 + Bi = BiCl_3 + 3CuCl The amount of producted BiCl_3 were about 2~3%. The concentration of lead by exchange reaction was reduced to below 50ppm from 2.0% in 1 hr. at 350℃, 400℃, and it was reduced to 45ppm in 30min, 10ppm in 1hr. at 400℃.
전극제조법과 용매 조성의 비가 고분자 전해질 연료전지의 전극 성능에 미치는 영향
임재욱,최대규,류호진 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7
In this study, we have investigated the effect of electrode fabrication methods, catalyst slurry composition and electrode and membrane-electrode-assemble(MEA) preparation conditions on the performance of electrode in polymer electrolyte membrane fuel cells(PEMFCs). We have changed the amount of platinum loading, electrode fabrication method(spraying and brushing) and the composition of electrode catalyst slurry. Better electrode performance was obtained with the increase in the platinum loading. The performance of the fabricated electrode by spraying method was higher than that by brushing method. The electrode catalyst slurry using 1:1, IPA and NBA solvents gave best performance. By optimising electrode preparation conditions, a current density of 700 mA/㎠ at 0.6 V was obtained, at 80℃, with H_(2) O_(2) reactants at 1 atm.