• 한국반도체및디스플레이장비학회:학술대회논문집
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• 한국반도체및디스플레이장비학회 2007년도 춘계학술대회
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• pp.34-38
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• 2007

청, 황 2-파장 발광층의 구성에서 청색층으로 GDI602를, 황색층으로 GD1602:Rubrene(10%)를 사용하여 2-파장 백색 유기발광다이오드(WOLED)를 제작하고 이들의 특성을 분석하였다. 실험에서는 GDI602:Rubrene (10%)-황색층의 두께를 $220\{AA}$으로 일정하게 두고, GDI602-청색층의 두께를 달리하여 소자들을 제작하였다. 제작된 소자들의 발광 스펙트럼 특성으로는 GDI602 층의 두께에 따라 중심파장의 위치는 거의 일정하나 2-파장 사이의 상대적 세기가 변화되었으며, GDI602 층의 두께가 얇아질수록 황색파장의 상대적 세기가 강해지는 것을 볼 수 있었다. GDI602 층이 $60{\AA}$인 소자는 11V, $70{\AA}$인 소자는 9V, $80{\AA}$인 소자는 8V, $90{\AA}$인 소자는 7V 에서 순수 백색광(x=0.33, y=0.33)에 가까운 발광 특성을 나타내었다. 또한 GDI602 층의 두께에 따른 효율과 휘도는 백색발광 조건에서 각각 0.51m/W와 $3650cd/m^2(60{\AA})$, 0.61m/W와 $1050cd/m^2(70{\AA})$, 0.91m/W와 $490cd/m^2(80){\AA}$, 1.61m/W와 $250cd/m^2(90){\AA}$을 나타내었다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2005년도 춘계학술대회 논문집
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• pp.148-151
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• 2005

A study on the microstructure and the texture of the samples after ECAP and subsequent heat treatment has been carried out. The specimens after ECAP showed a very fine grain size, a decrease of <100> // ND, and an increase of <111> // ND textures. The $\{111\}<112>,\;\{123\}<634>,\;\{110\}<001>,\;\{112\}<111>,\;\{110\}<111>,\;and\;\{013\}<231>$ texture components were increased in the specimens after the ECAP and subsequent heat-treatment at $400^{\circ}C$ for 1 hour. One of the most important properties in sheet metals is formability. The r-value or plastic strain ratio has been used as a parameter that expresses the formability of sheet metals. The change of the plastic strain ratios after the ECAP and subsequent heat-treatment conditions has been investigated and it was found that they were two times higher than those of the initial Al sheets. This could be attributed to the formation above texture components through the ECAP and subsequent heat-treatment.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 춘계학술대회논문집
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• pp.92-95
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• 2003

Asymmetric rolling of AA1050 Al alloy sheets was performed to obtain the shear textures for improving the deep drawability and the grain refinement. The effect of roll velocity ratio on the texture and the grain refinement of 50％ asymmetrically rolled sheets was studied. The textures of the asymmetrically rolled sheets after annealing at 400$^{\circ}C$ for 1 h was also investigated.

• Journal of Welding and Joining
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• 제3권2호
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• pp.10-15
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• 1985

Roughness of the surface to be welded is one of the important factors affecting the weldabilities on the pressure welding. The purpose of this study is to investigate the influences of the surface roughness upon the welding process and the weldability of pressure welds, using Aluminium AA1050 plates treated by various surface polishing The results obtained are as following. 1. The optimum welding deformation is about 38(%)-42(%) in cold pressure weld. 2. The grinding work on the weld surface is superior to milling and paper polishing. 3. Weld pressure must be beyond $0.5kg/mm^2$ in order that the bond may be achieved.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 추계학술대회 논문집
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• pp.471-475
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• 2000

P-type (100) Si wafer patterned with 1000$\AA$ SiO$_2$island was used as substrate and the Si films were deposited under low pressure using Si$_2$H$_{6}$-H$_2$gas mixture where the total gas flow rate and deposition pressure were 16.6sccm and 3.5mtorr, respectively. In this condition, we selectively obtained high-quality epitaxial Si layer of the 350~1050$\AA$ thickness. In order to extend the incubation period, we kept high pressure H$_2$ environment without Si$_2$H$_{6}$ gas for few minutes after first incubation period and then we conformed the existence of second incubation period.iod.

• 전자공학회논문지D
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• 제34D권11호
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• pp.76-82
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• 1997

The characteristics of optical waeguides and IDT electrodes fabricated for acousto-optic tunable filters (AOTE) used for optical communications were analyzed. A $Ti:LiNbO_3$ in-diffusion method was employed for the formation of the optical waveguide with a dimension of width $8\mu\textrm{m}$, length $30000\mu\textrm{m}$, and thickness $1150{\AA}$. The diffusion was carried at $1050^{\circ}C$ for 8 houss to pattern the optical waveguide with Ti. The resulted waveguide exhibited a single mode at a 1550nm wavelength range and its propagation loss was less than 0.5dB/cm. The width of IDT, with 10 SAW periods, was $5000\mu\textrm{m}$, S11 reflection characteristics and impedances of th eelectrodes deposited with Au were analyzed using a network analyzer; $48.1\Omega$ at th ecenter frquency of 193MHz for Au deposition thickness of $1500{\AA}$ and $50.7\Omega$ at the center frequency of 192MHz for au deposition thickness of $1600{\AA}$.

• 전기화학회지
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• 제2권3호
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• pp.117-122
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• 1999

본 연구에서는 알칼리 용액에서 알루미늄의 부식속도를 측정하면서, 합금원소, 알칼리도(KOH농도),용액온도, 그리고 용액에 첨가하는 부식 억제제의 종류와 그 농도 등이 미치는 영향에 대해 조사하였다. 알루미늄 제품에 따라서는 순도 $99\%$ 이상인 AA-1050의 부식속도가 가장 낮은 반면에 Mg나 Mn이 포함된 합금은 상대적으로 높게 측정되었다. KOH 수용액에 ZnO를 포화농도로 첨가하면 부식속도가 $50\%$ 이상 억제되는 효과가 나타났지만. ZnAc는 부식 억제제로서 역할하지 못하였다. 알칼리도와 용액온도가 높을수록 ZnO의 부식 억제효과는 상승하였다 부식속도는 KOH농도에 대해 1차 선형 증가함수 그리고 온도 역수에 대해 지수형 감소함수로 나타났다. SEM과 EDS를 사용하여 부식 표면에 부착된 물질의 성분을 분석하였으며, XRD의 기기분석을 통하여 KOH 용액에서의 알루미늄의 부식 생성물이 $Al(OH)_3$임을 확인하였다.

• 한국전기전자재료학회논문지
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• 제11권8호
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• pp.637-645
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• 1998

The characteristics of waveguide, electrode and packaging fabricated for acousto-optic tunable filters(AOTF) used for optical communications were analyzed. A $Ti:LiNbO_3$in-diffusing method was employed for the formation of the optical waveguide with a dimension of width $8{\mu}m$, length $30000-50000{\mu}m$ and varying the thickness. The diffusion was carried at $1050^{\circ}C$ for 8 hours to pattern the optical waveguide. The resulted waveguide exhibited a single mode at 1550nm optical wavelength. The width of IDT, with 10 SAM periods, was $5000{\mu}m$ . Impedances of the electrodes deposited with Au were analyzed using a network analyzer; $48.1\Omega$ at the center frequency of 193MHz for electrode thickness of $1500{\AA}$ and $50.7\Omega$ at the center frequency of 192MHz for $1600\AA$. And the characteristics of packaged AOTF was analyzed. When the electrical frequency 177.1MHz was applied to the device, the mode conversion efficiency was measured as 63% at the optical wavelength 1515nm.

• 대한금속재료학회지
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• 제49권11호
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• pp.893-899
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• 2011

Fabrication of a complex aluminum alloy by the ARB process using dissimilar aluminum alloys has been carried out. Two-layer stack ARB was performed for up to six cycles at ambient temperature without a lubricant according to the conventional procedure. Dissimilar aluminum sheets of AA1050 and AA5052 with thickness of 1 mm were degreased and wire-brushed for the ARB process. The sheets were then stacked together and rolled to 50% reduction such that the thickness became 1 mm again. The sheet was then cut into two pieces of identical length and the same procedure was repeated for up to six cycles. A sound complex aluminum alloy sheet was successfully fabricated by the ARB process. The tensile strength increased as the number of ARB cycles was increased, reaching 298 MPa after 5 cycles, which is about 2.2 times that of the initial material. The average grain size was $24{\mu}m$ after 1 cycle, and became $1.8{\mu}m$ after 6 cycles.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 추계학술대회논문집
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• pp.132-135
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• 2003

Asymmetric rolling, in which the ratio of the rotation rates of the upper and lower rolls was 2, has been used to introduce an intense plastic shear strain for the purpose of grain refinement and developing shear deformation textures through the sheet thickness to improve the strength and plastic strain ratio of AA1050 aluminum alloy sheets. The alloy sheets were rolled at room temperature without lubrication. The textures and microstructures of the sheets were investigated by x-ray diffraction and electron back-scattered diffraction (EBSD) analyses with emphasis on effects of combinations of rot ling directions.