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유성재,신호철,김영섭,이상범,장지근,공명선,장호정,이준영,이영관,Yu, Sung-Jae,Shin, Ho-Chul,Kim, Young-Sup,Rhew, Sang-Burm,Jang, Ji-Geun,Gong, Myung-Seon,Chang, Ho-Jung,Lee, Jun-Young,Lee, Young-Kwan 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.2
This paper presents a optimizing algorithm getting through analyzing a image improvement algorithm using retinex theory. Improving a existing retinex theory's slow process speed, our proposal is that it controls a small filter size of surrounding function by comparing with original algorithm. So slow process speed decreased drastically. For filling a short of lighting information by small filter, we also selected gray image as a forth channel. Using the color constancy, we got fast process time like linear color correction and could do comfortable auto color rectification according to other images.
Cross-Linked PVP 게이트 유기 박막트랜지스터
장지근,오명환,장호정,김영섭,이준영,공명선,이영관,Jang Ji-Geun,Oh Myung-Hwan,Chang Ho-Jung,Kim Young-Seop,Lee Jun-Young,Gong Myoung-Seon,Lee Young-Kwan 한국마이크로전자및패키징학회 2006 마이크로전자 및 패키징학회지 Vol.13 No.1
유기 박막트랜지스터(OTFTs)제작에서 PVP-게이트 절연막의 형성과 처리가 소자성능에 미치는 영향을 조사하였다. 유기 게이트 용액의 제조에서는 polyvinyl 계열의 PVP(poly-4-vinylphenol)를 용질로, PGMEA (propylene glycol monomethyl ether acetate)를 용매로 사용하였다. 또한 열경화성 수지인 poly(melamine-co-formaldehyde)를 경화제로 사용하여 유기 절연막의 cross-link를 시도하였다. MIM 시료의 전기적 절연 특성을 측정한 결과, PVP-기반 유기 절연막은 용액의 제조에서 PGMEA에 대한 PVP와 poly (melamine-co-formaldehyde)의 농도를 증가시킬수록 낮은 누설전류 특성을 나타내었다. OTFT 제작에서는 PGMEA에 대해 PVP를 20 wt%로 섞은 PVP(20 wt%) copolymer와 5 wt%와 10 wt%의 poly(melamine-co-formaldehyde)를 경화제로 추가한 cross-linked PVP(20 wt%)를 게이트 유전 재료로 사용하였다. 제작된 트랜지스터들에서 전계효과 이동도는 5 wt % cross-linked PVP(20 wt%) 소자에서 $0.31cm^2/Vs$로, 그리고 전류 점멸비는 10 wt% cross-linked PVP(20 wt%) 소자에서 $1.92{\times}10^5$으로 가장 높게 나타났다. The preparation and processing of PVP-gate insulators on the device performance have been studied in the fabrication of organic thin film transistors (OTFTs). One of polyvinyl series, poly-4-vinyl phenol(PVP) was used as a solute and propyleneglycol monomethyl etheracetate(PGMEA) as a solvent in the formation of organic gate solutions. The cross-linking of organic insulators was also attempted by adding the thermosetting material, poly (melamine-co-formaldehyde) as a hardener in the compounds. From the measurements of electrical insulating characteristics of metal-insulator-metal (MIM) samples, PVP-based insulating layers showed lower leakage current according to the increase of concentration of PVP and poly (melamine-co-formaldehyde) to PGMEA in the formation of organic solutions. The PVP(20 wt%) copolymer with composition of 20 wt% PVP to PGMEA and cross-linked PVPs in which 5 wt% and 10 wt% poly (melamine-co-formaldehyde) hardeners had been additional]y mixed into PVP(20 wt%) copolymers were used as gate dielectrics in the fabrication of OTFTs, respectively. In our experiments, the maximum field effect mobility of $0.31cm^2/Vs$ could be obtained in the 5 wt% cross-linked PVP(20 wt%) device and the highest on/off current ratio of $1.92{\times}10^5$ in the 10 wt% cross-linked PVP(20 wt%) device.
Stacked GDI602(691)/GDI602(Rubrene) 형광층을 갖는 2-파장 유기발광소자
장지근,장호정,오명환,강정원,이준영,공명선,이영관,김희원,Jang, Ji-Geun,Chang, Ho-Jung,Oh, Myung-Hwan,Kang, Jung-Won,Lee, Jun-Young,Gong, Myoung-Seon,Lee, Young-Kwan,Kim, Hee-Won 한국재료학회 2007 한국재료학회지 Vol.17 No.4
A new organic light emitting device(OLED) with two peak wavelength(blue and yellow) emission was fabricated using the selective doping in a single fluorescent host , and its electrical and optical characteristics were investigated. The fabricated device showed the luminance and efficiency of 1600 $Cd/m^2$ and 2.4 Im/W under the applied voltage of 10V, respectively. And its electroluminescent spectra had two peak wavelengths of 470nm and 560nm emitting bluish white light. The OLED with dual wavelength emission in this experiment is likely to be developed as a white OLED with simpler fluorescent system than conventional devices.
GDI 호스트-도펀트 형광체를 이용한 청색 OLED의 제작과 특성 평가
장지근,신세진,강의정,김희원,장호정,오명환,김영섭,이준영,공명선,이영관,Jang, Ji-Geun,Shin, Se-Jin,Kang, Eui-Jung,Kim, Hee-Won,Chang, Ho-Jung,Oh, Myung-Hwan,Kim, Young-Seop,Lee, Jun-Young,Gong, Myoung-Seon,Lee, Young-Kwan 한국재료학회 2006 한국재료학회지 Vol.16 No.4
The blue emitting OLEDs using GDI host-dopant phosphors have been fabricated and characterized. In the device fabrication, 2-TNATA [4,4',4'-tris(2-naphthylphenyl-phenylamino)- triphenylamine] as a hole injection material and NPB [N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine] as a hole transport material were deposited on the ITO(indium thin oxide)/glass substrate by vacuum evaporation. And then, blue color emission layer was deposited using GDI602 as a host material and GDI691 as a dopant. Finally, small molecule OLEDs with structure of ITO/2-TNATA/NPB/GDI602:GDI691/Alq3/LiF/Al were obtained by in-situ deposition of Alq3, LiF and Al as the electron transport material, electron injection material and cathode, respectively. Blue OLEDs fabricated in our experiments showed the color coordinate of CIE(0.14, 0.16) and the maximum power efficiency of 1.1 lm/W at 11 V with the peak emission wavelength of 464 nm.
공명선,조현기 단국대학교 신소재기술연구소 1991 신소재 Vol.1 No.-
고분자막 습도 센서의 감습 재료를 합성하기 위하여 4-chloromethyl styrene(4-CMSt)과 methylmethacrylate(MMA)의 여러 가지 조성의 공중합체를 합성하여, 이를 전극에 도포하고 N, N, N', N'-tetramethyl ethylene diamine으로 4차 암모늄화 시켰다. 상대 습도에 따른 impedance 변화를 측정한 결과, 공중합체에서 MMA의 비율이 많아지면서 impedance가 감소하였으며, 폴리 비닐 알콜을 첨가하면 impedance가 증가하였다. 또한 4CMst/MMA=1, 경우 hysteresis는 ±5% RH 내외이며, 온도 의존계수는 -0.5% RH/℃이었다. 30% RH, 60% RH, 90% RH에서의 평균 저항 값은 각각 3.0×10^6Ω, 200KΩ 9KΩ이었다. The various composition of copolymers of 4-chloromethyl styrene(4-CMS5) and methyl methacrylate(MMA) were synthesized as a humidity sensitive meterial and quartenized N, N, N', N'-tetramethylethylene diamine(TMED). Impedance versus relative humidity decreased as the content of MMA in the copolymer increased. Addition of polyvinyl alcohol increased the impedance of the humidity sensor. In the case of 4-CMSt/MMA=1, the hysteresis and temperature coefficient were ±5% RH and -0.5% RH/℃. The average resistance at 30% RH, 60% RH and 90% RH are 3.0×10^6Ω, 200KΩ and 9KΩ respectively.