Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Hyung-Do Yoon"'
Publikováno v:
ICTC
Detection of chemical agents is important because some chemical agents have high toxic effects and can be used as chemical weapons. In this case, the power system plays an important role for stable power distribution of the detection device. In this
Publikováno v:
Journal of the Korean Physical Society. 72:1174-1178
UV LED lightings have been displacing conventional UV lamps due to their high efficiency, long lifetime, etc. A sterilizing lighting was prepared by assembling a UV LED module composed of 265-nm UVC LEDs and a silica lens array with a driver module c
Publikováno v:
Journal of Nanoscience and Nanotechnology. 15:7787-7790
In-plane structural anisotropy is characteristic of nonpolar (1120) a-plane GaN (a-GaN) films grown on r-plane sapphire substrates. The anisotropic peak broadenings of X-ray rocking curves (XRCs) are clearly observed with M- or W-shaped dependence on
Autor:
Hyung-Do Yoon, Jae-Hyoun Park
Publikováno v:
Journal of Sensor Science and Technology. 21:1-6
Using a current-mode multiple reset, a current-to-voltage(I-V) converter with a wide dynamic range was produced. The converterconsists of a trans-impedance amplifier(TIA), an analog-to-digital converter(ADC), and an N-bit counter. The digital output
Publikováno v:
Journal of Nanoscience and Nanotechnology. 11:10339-10343
The authors report on an improved light extraction method from large-area vertical light emitting diodes (VLEDs) with deep hole-patterns fabricated using nanosphere lithography. In order to produce the ordered deep-hole patterns on the n-type GaN sur
Autor:
Choeun Lee, Eunhee Shim, Youngmin Lee, Sejoon Lee, Eiwhan Jung, Hyung Do Yoon, Dejun Fu, Deuk Young Kim, Jinyong Lee
Publikováno v:
Journal of the Korean Physical Society. 59:2774-2777
Autor:
Jae-Hyoun Park, Hyung-Do Yoon
Publikováno v:
IEICE Electronics Express. 8:556-560
A novel multi-channel LED driver is presented, consisting of an active current regulator and a switch-mode voltage regulator for each channel. This driver is implemented using a 0.35µm 40V high voltage process. The active current regulator directly
Autor:
Dae-Woo Jeon, Sung-Min Hwang, Myoung Kim, Hyung-Do Yoon, Lee Woon Jang, Mi Hee Lee, Ju Won Jeon, In Hwan Lee
Publikováno v:
Journal of the Korean Physical Society. 57:1867-1870
Autor:
Kyunghwan Oh, Hyung-Do Yoon, Jae Hyoun Park, Keun Man Song, Kwang Hyeon Baik, Seok Woo Lee, Sung-Min Hwang, Yong Gon Seo
Publikováno v:
Current Applied Physics. 10:1407-1410
Non-polar a-plane ( 11 2 ¯ 0 ) light-emitting diodes (LEDs) in InGaN/GaN multiple quantum well structures were successfully fabricated by metal organic chemical vapor deposition (MOCVD) directly grown on r-plane ( 1 1 ¯ 20 ) sapphire substrates. Th
Autor:
Trilochan Sahoo, Jung Hun Choi, Yeon-Tae Yu, Seong Ran Jeon, Hyung Do Yoon, Jong Hyeob Baek, In Hwan Lee, Sung-Min Hwang, Ju Wan Yoo
Publikováno v:
Journal of Crystal Growth. 312:2857-2860
ZnO nanorod arrays are grown on a-plane GaN template/r-plane sapphire substrates by hydrothermal technique. Aqueous solutions of zinc nitrate hexahydrate and hexamethylenetetramine were employed as growth precursors. Electron microscopy and X-ray dif