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백광선,김형진,김명룡,장동욱,박광복 한국철도학회 2004 한국철도학회논문집 Vol.7 No.3
In this paper, traction system and electric devices of a double deck train were designed to examine technical reasonableness for driving on the ground and underground. Double deck trains operated in other countries were also considered. For designing the electric devices, two types of accelerations and electric devices arrangements which are based on the current subway system were considered.
나노 구조의 패턴을 갖는 n-type GaN 기판을 이용한 380 nm UV-LED의 광 추출 효율 개선
백광선,조민성,이영곤,송영호,김승환,김재관,전성란,이준기,Baek, Kwang-Sun,Jo, Min-Sung,Lee, Young-Gon,Sadasivam, Karthikeyan Giri,Song, Young-Ho,Kim, Seung-Hwan,Kim, Jae-Kwan,Jeon, Seong-Ran,Lee, June-Key 한국재료학회 2011 한국재료학회지 Vol.21 No.5
Ultraviolet (UV) light emitting diodes (LEDs) were grown on a patterned n-type GaN substrate (PNS) with 200 nm silicon-di-oxide (SiO2) nano pattern diameter to improve the light output efficiency of the diodes. Wet etched self assembled indium tin oxide (ITO) nano clusters serve as a dry etching mask for converting the SiO2 layer grown on the n-GaN template into SiO2 nano patterns by inductively coupled plasma etching. PNS is obtained by n-GaN regrowth on the SiO2 nano patterns and UV-LEDs were fabricated using PNS as a template. Two UV-LEDs, a reference LED without PNS and a 200 nm PNS UV-LEDs were fabricated. Scanning Electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Photoluminescence (PL) and Light output intensity- Input current- Voltage (L-I-V) characteristics were used to evaluate the ITO-$SiO_2$ nanopattern surface morphology, threading dislocation propagation, PNS crystalline property, PNS optical property and UVLED device performance respectively. The light out put intensity was enhanced by 1.6times@100mA for the LED grown on PNS compared to the reference LED with out PNS.
백광선(Kwang-Sun Baik),김형진(Hyeong-Jin Kim),김명룡(Myung-Yong Kim),장동욱(Dong-Uk Jang),박광복(Kwang-Bok Park) 한국철도학회 2004 철도저널 Vol.7 No.3
In this paper, traction system and electric devices of a double deck train were designed to examine technical reasonableness for driving on the ground and underground. Double deck trains operated in other countries were also considered. For designing the electric devices, two types of accelerations and electric devices arrangements which are based on the current subway system were considered.