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채수조(Chae, Soo-Joh) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
반사와 굴절이 합쳐진 새로운 형태의 하이브리드 태양광 집광 장치로 기존 집광 장치에 비해 초점 거리가 짧게 설계되었다. 프레넬 렌즈 형태의 굴절부와 프레넬형의 다수의 포물선 반사경이 공통으로 후면 초점(rear focus)을 가지도록 배치하여 기존 프레넬 렌즈만으로 구성된 것보다 선형 집광의 경우는 3배, 점 집광의 경우는 10배 이상 집광비를 높일 수 있다.아울려 이를 이용한 선형 집광형 발전 시스템과 점형 집광 장치는 나름대로 장점을 가진다.
Jay Yatulis,Ryan Butler,Mathew Higgins,La Plante Curtis,Soo Joh Chae,Chul Gyu Jhun,Woo Young Kim 대한금속재료학회 ( 구 대한금속학회 ) 2009 ELECTRONIC MATERIALS LETTERS Vol.5 No.4
This research entailed the development of cost effective method to re-size LCD glass with a Mean Time to Failure (MTF) of greater than or equal to uncut glass. A Carbon Dioxide laser was completed on a standard 3-axis materials processing platform with alignment tolerances of up to 50 microns. The many key cutting factors and the variables that generated the most success included the operation of the laser in pulsed mode, the incorporation of a dry Nitrogen gas assist at close proximity to the LCD glass, relatively slow translational speeds, and laser output powers of up to up to 7 Joule 20ns pulse widths before focusing optics were used. Only at these higher output powers could the display be completely penetrated with minimal thermal damage, but in conjunction with the slower translational speeds and moderate gas assists pressures of approximately 15PSI, adequate cooling was provided to salvage most types of LCD technologies tested.
Fabrication of White Organic Light-Emitting Diodes Using Two Complementary Color Methods
Kim, You-Hyun,Seo, Ji Hoon,Hyung, Gun Woo,Lee, Sang Youn,Ryu, Dae Hyun,Chae, Soo Joh,Shin, Sung Sik,Kim, Young Kwan,Kim, Woo Young TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.510 No.1
<P> White organic light-emitting diodes (WOLEDs) were fabricated using two complementary color methods with two emissive layer structure such as NPB (500 Å)/DPVBi (65 Å)/MADN:DCM2-0.5% (170 Å)/Bphen (300 Å)/Liq (20 Å)/Al (1000 Å). A deep blue and orange emissions were obtained from DPVBi layer and MADN host doped with a red fluorescent DCM2 dopant each. White emission was achieved through controlling hole-electron recombination by optimization of emissive layers thicknesses and DCM2 concentrations. Optimized WOLED device shows emission efficiency of 5.04 cd/A, current density of 2.64 mA/cm2 and luminance of 938 cd/m2 at 6 V with CIEx,y color coordinate of (0.338, 0.330). These results indicate that DPVBi layer effects on hole blocking and the exciton generation due to difference of energy level in highest occupied molecular orbital. The CIEx,y coordinates of device was slightly changed change from (0.338, 0.330) at 6 V to (0.341, 0.333) at 12 V, which is almost independent on driving voltages.</P>