• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2004년도 하계종합학술대회 논문집(2)
• /
• pp.379-382
• /
• 2004

In this paper we fabricated a test panel for AMOLED on glass and PET substrate. The test panel consisted of the various size of OTFTs and OLEDs and the current driving capability of OTFTs for OLEDs has been investigated. OTFTs were made of the inverted staggered structure and employed polyvinylphenol (PVP) as the gate insulator and pentacene thin film as the active layer. The OTFTs produced the filed effect mobility of $0.3 cm^2/V.sec$ and on/off current ratio of $10^5$. OLEDs consisted of TPD for HTL and Alq3 for EML with 35nm thick, generating green monochrome light. We found that OTFT with channel length of 70${\mu}m$ and channel width of over 3.5mm provided the sufficient current to OLED to generate the luminescence of $0.3Cd/m^2$.

• KIEAE Journal
• /
• 제1권2호
• /
• pp.47-54
• /
• 2001

Single sound absorbers such as porous materials, panels, and Helmholts resonators have limited performance with some extents of frequency region. For example, porous materials do not attenuate low frequency sounds, while panels do not absorb high frequency sounds. Composite absorption structure with coverings, porous materials, and air gaps are an alternative for wide band sound absorption. Slits, panels, perforated panels are those materials for coverings, glass wool, mineral wool, polyester, and polyurethane are frequently used porous materials. Air gap between the porous material and background surface is one of major factors which governs the absorption characteristics of composite absorption structures, especially in the low frequency area. Calculations and measurements show that the absorption coefficients of composite absorption structure, in mid and low frequency bands, are getting higher with increased air gaps. Perforated panels rather than slits and panels are good coverings with higher number as far as absorption coefficient is concerned. Perforated panels with porous materials and 37 cm of air gaps in background have high absorption coefficients for all frequency bands, above 0.7 to 1.0. All measurements are performed in reverberation chamber, Mokpo National University, according to ISO 354 and ISO 3382.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2000년도 춘계학술대회 논문집 디스플레이 광소자 분야
• /
• pp.133-138
• /
• 2000

MgO thin films were deposited using $Mg(tmhd)_2$ as a precursor dissolved in a solvent by electrostatic spray pyrolysis. When a pure tetra hydro furan was used as a solvent, a large number of particles appeared on the MgO thin film surface due to homogeneous nucleation. However, by adding 1-butyl alcohol or 1-octyl alcohol to THF, homogeneous nucleation was restricted and the number density of the large particles was also drastically reduced. X-ray diffraction analysis showed that the MgO films had a (100) preferred orientation regardless of the type of solvents used. Characterization using Fourier Transformed-Infrared and spectroscopic photometer revealed that the crystallized MgO thin films on the glass substrate had a high optical transmittance (> 85 %) in the visible range. Discharge characteristics of MgO thin films deposited by ESP method on an alternating-current plasma display panel were compared with a MgO thin film prepared by reactive radio-frequency planar magnetron sputtering.

• 한국산학기술학회논문지
• /
• 제6권6호
• /
• pp.497-501
• /
• 2005

Dry film 공정에 의해 PDP(Plasma Display Panel)용 무연 투명유전체를 제조하였다. 여러 슬러리 조성으로부터 고밀도 green sheet를 제조하는데 최적의 조성을 선정하였다. 한편, 슬러리는 양질의 green sheet를 제작하는데 적합한 shear thinning 특성을 나타냈다. 제조한 투명유전체의 열팽창계수는 유리기판인 PD-200과 유사한 $97{\times}10^{-7}/^{\circ}C$로 측정되었다. PD-200에 접합된 투명유전체의 단면 주사현미경 관찰로부터 두 층은 갭이 없이 매우 견실히 접합되어 있음을 확인할 수 있었다.

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2003년도 추계학술발표강연 및 논문개요집
• /
• pp.196-196
• /
• 2003

현재 PDP(Plasma Display Panel) 상판의 유전체층은 저온에서 소성이 가능한 저융점 유리가 요구되기 때문에 융점을 낮추기에 용이한 PbO계가 주 성분으로 사용되어 오고 있으나. 최근 환경오염 등의 문제점으로 인해 Pb-free을 추구하는 새로운 유리조성의 연구가 많이 수행되고 있다. 이에 본 연구는 이미 PDP의 격벽과 봉착용 조성으로 많이 연구되어진 비스무스계 유리를 고려하여 PDP의 투명유전체용 조성을 찾고자 한다. Bi$_2$O$_3$-ZnO-SiO$_2$3원계를 기본으로 하는 유리조성에 유리망목형성제등을 첨가하여 열적특성과 광학적 특성을 조사하였다. 열적특성은 DTA를 이용하여 유리 전이 점(Tg) 및 융점(Tl)등을 측정하였고 TMA를 이용하여 선팽창계수(CTE)를 측정하였으며 유리섬유를 제조한 후 Littleton softening point (Ts)를 측정하였다. 광학적 특성은 페이스트를 제조하여 스크린프린팅 후 54$0^{\circ}C$~$600^{\circ}C$에서 1-2 h동안 소성하여 투광성을 조사하였다. 그 결과로, 열적특성으로는 400~5$50^{\circ}C$의 Tg, 450~$600^{\circ}C$의 Ts 및 5~11$\times$$10^{-6}$K의 CTE 값을 나타 내었고 광학적 특성으로 투광성은 양호한 특성(60% 이상)을 나타내었다. Bi$_2$O$_3$ 계를 현재 PDP의 투명유 전체에 적용시키기에는 유리용융시에 높은 점도와 환원 등의 문제점을 갖고 있지만 열적특성과 광학특성면에서는 가능성을 제시하여 향후 연구를 할 가치가 있다고 본다.

• 노동경제논집
• /
• 제40권4호
• /
• pp.61-89
• /
• 2017

본 연구는 여성관리자패널조사(Korean Women Manager Panel)를 이용하여 한국 여성 근로자의 직장 내 스트레스 및 승진에 상사의 성별이 미치는 영향을 분석한다. 분석결과 직속 상사가 여성일 때 여성 근로자의 직장 내 스트레스는 높았고, 사원 및 대리 직급 여성의 승진에 부의 영향을 미치는 것으로 나타났다. 여왕벌 현상과 역할일치이론에 따르면 한국과 같이 유리천장이 견고하고 상위 직급의 남성 밀집도가 높은 구조에서는 여성 리더십의 긍정적인 특성이 발휘되기보다 다른 여성에 대해 높은 인정 기준을 요구하거나 경쟁적인 모습을 보여 여성 상사를 둔 여성 근로자의 직장 내 스트레스는 높고 낮은 직급의 여성 승진확률은 낮추는 것으로 해석할 수 있다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
• /
• pp.1466-1469
• /
• 2008

We have fabricated 2.5 inch QQCIF AM-OLED panel driven by ZnO-TFT on a plastic substrate for the first time. The number of photo mask for the whole panel process was 5 and the TFT structure was top gate with active protection layer as a first gate insulator. Optimizing the process for the substrate buffer layer, active layer, ZnO protection layer, and gate insulator was key factor to achieve the TFT performance enough to drive OLED. The ZnO TFT has mobility of $5.4\;cm^2/V.s$, turn on voltage of -6.8 V, sub-threshold swing of 0.39 V/decade, and on/off ratio of $1.7{\times}10^9$. Although whole process temperature is below $150^{\circ}C$ to be suitable for the plastic substrate, performance of ZnO TFT was comparable to that fabricated at higher temperature on the glass.

• 한국디지털건축인테리어학회논문집
• /
• 제11권3호
• /
• pp.35-42
• /
• 2011

The exterior system of buildings, which is the typical curtain wall, has been made with glass and metal. Theses materials, however, have weaknesses such as inadequate insulating quality, short durability, combustibility and toxic substance. On the other hand, Autoclaved Aerated Concrete(AAC) or Autoclaved Lightweight Concrete(ALC) possess the great energy efficiency and the superb insulating quality as substitute of existing exterior system materials. In this research, strength characteristics and bubble dispersion of hydrothermal synthesis process of AAC based on CaO/$SiO_2$(C/S) ratio are analyzed. C/S ratio is determinated and bubble distribution and compressive strength are studied through the test of varied water-to-solid mineral ratio(W/S). In hydrothermal synthesis program, final C/S ratio is determined as 0.7 consider of the manufacturing process and hydrothermal synthesis is done at $180^{\circ}C$ for 7 hours. The analysis shows slurry has about 2,300cP viscosity and 0.56 specific gravity therefore it is expected AAC has the appropriate facility in the manufacturing process and Hydrates of AAC's Expansion.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
• /
• pp.281-285
• /
• 2006

Recently LG.Philips LCD (hereafter "LPL") has announced the development of the world's largest 100-inch TFT-LCD with Advanced Super IPS technology. This magnificent LCD achieves the feature of a full high definition resolution $1920{\times}1080(16:9)$, 600nit brightness, 3000:1 dynamic contrast ratio, 92% color gamut, 180 degree viewing angle, and 5msec response time at all grays, targeted for HDTV and public display applications. Some unique technologies such as Cu bus line, advanced wide view polarizer, and high color gamut lamp were applied. A new stitching free technology was developed to overcome the size limitation of photo mask in both the TFT and CF processes. The size of the panel (100-inch) based on the wide format (16:9) is determined by the maximum efficiency of world's $1^{st}$ seventh generation line (glass size:$1950{\times}2250mm$) in LPL's Paju display cluster. In this paper, we will discuss the issues of 100-inch TFT-LCD.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
• /
• pp.953-956
• /
• 2003

Transparent conductive ZnO:Ga thin films were deposited on glass substrates using rf magnetron sputtering method for flat panel display. The ZnO:Ga films were preferentially oriented to c-axis (002) of on substrates. The surface morphology was smooth and had not porous whatever substrate temperature was. The electrical conductivity of the thin films were in the range of $1.6{\times}10^2{\sim}6.7{\times}10^3\;{\Omega}^{-1}cm^{-1}$ at the growth temperature from 50 to $400^{\circ}C$, whereas has a maximum at around $250^{\circ}C$. By combining of XRD and EXAFS, the crystallinity and grain size decreased with increasing substrate temperature corresponding to the reduction of the grain-boundary scattering. The optical transmittance of sputtered ZnO:Ga thin films had an improved about 86% in the UV-visible region.