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Choi, Jin-Hwan,Kim, Young-Min,Park, Young-Wook,Park, Tae-Hyun,Jeong, Jin-Wook,Choi, Hyun-Ju,Song, Eun-Ho,Lee, Jin-Woo,Kim, Cheol-Ho,Ju, Byeong-Kwon IOP Pub 2010 Nanotechnology Vol.21 No.47
<P>The present study demonstrates a flexible gas-diffusion barrier film, containing an SiO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> nanolaminate on a plastic substrate. Highly uniform and conformal coatings can be made by alternating the exposure of a flexible polyethersulfone surface to vapors of SiO<SUB>2</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB>, at nanoscale thickness cycles via RF-magnetron sputtering deposition. The calcium degradation test indicates that 24 cycles of a 10/10 nm inorganic bilayer, top-coated by UV-cured resin, greatly enhance the barrier performance, with a permeation rate of 3.79 × 10<SUP> − 5</SUP> g m<SUP> − 2</SUP> day<SUP> − 1</SUP> based on the change in the ohmic behavior of the calcium sensor at 20 °C and 50% relative humidity. Also, the permeation rate for 30 cycles of an 8/8 nm inorganic bilayer coated with UV resin was beyond the limited measurable range of the Ca test at 60 °C and 95% relative humidity. It has been found that such laminate films can effectively suppress the void defects of a single inorganic layer, and are significantly less sensitive against moisture permeation. This nanostructure, fabricated by an RF-sputtering process at room temperature, is verified as being useful for highly water-sensitive organic electronics fabricated on plastic substrates. </P>
Depth sensitivity of stereoscopic displays
Choi, Byeong-Hwa,Choi, Dong-Wook,Lee, Ja-Eun,Lee, Seung-Bae,Kim, Sung-Chul The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.1
Depth sensitivity is considered one of the factors influencing 3D displays the most. In this paper, the perceptual 3D depth was quantitatively measured to compare the depth difference among the display devices. No difference was found in the typical display performance among the devices, but the subjective evaluation of the depth sensitivity where the disparity was varied showed that the organic light emitting diode (OLED) had the highest performance, mainly due to its almost 0% crosstalk, one of the features of OLED. Crosstalk is a form of image superposition that greatly affects the depth sensitivity. The experiment results showed that the quantitative depth sensitivity varies due to geometric factors such as disparity, viewing distance, and subjective sensitivity, depending on the display image characteristics, such as crosstalk and contrast.
Young Wook Park,Young Min Kim,Jin Hwan Choi,Tae Hyun Park,Jin-Wook Jeong,Hyun Ju Choi,Byeong Kwon Ju IEEE 2010 IEEE electron device letters Vol.31 No.5
<P>This letter reports on the effect of the triplet energy (<I>E</I> <SUB>T</SUB>) of the hole-blocking layer (HBL) on triplet exciton quenching between the emissive layer (EML) host and the HBL of phosphorescent organic light-emitting diodes (PHOLEDs). Using different EML hosts and HBLs having different <I>E</I> <SUB>T</SUB>'s and electron mobilities, the effects of the <I>E</I> <SUB>T</SUB>'s of the HBL have been analyzed. When the <I>E</I> <SUB>T</SUB> of the HBL is lower than that of the EML host, the PHOLEDs show significant dependence of reduced device performances. PHOLEDs having a 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole HBL show 65% improved external quantum efficiency (EQE) at 500 cd/m<SUP>2</SUP> with a 4, 4',4'-tris( <I>N</I>-carbazolyl)-triphenyl-amine host than that with an <I>N</I>,<I>N</I>' -dicarbazolyl-4-4<SUP>'</SUP>'biphenyl host, while PHOLEDs having a 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline HBL show 41% reduced EQE. To solve the remaining key issue of developing highly efficient PHOLEDs, the <I>E</I> <SUB>T</SUB> of matching the EML and the HBL is extremely desirable and is also explored.</P>
민병욱(Byeong-Wook Min),신태우(Tai-Woo Shin),최인혁(In-hyuk Choi),최한열(Han-Yeol Choi),박재웅(Jae-Ung Park),유근양(Kun-Yang Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Porcelain insulators have generally been used in Korea but polymer insulators which are superior in that they are light weight, explosion proof, impact proof, economical with construction characteristics, have been in use for the 154㎸ transmission line since 1999 following a worldwide trend towards the reduced weight, simplification and compact usage of new material insulators. However there have been approximately 500 cases of forest fires in Korea, so the transmission lines that for the most part pass through mountainous areas have been highly effected and the highly polymerized compound polymer insulator has raised concern about reliability in cases of exposure to forest fires. Therefore for the reliability assessment of the effect of forest fires on polymer insulators, mechanical and electrical characteristics are analyzed by an artificial flare test device and transmission facility surrounding conditions along with forest fire characteristics are surveyed. In addition to this, actual 90 ㎸ energized transmission line was tested with an artificial forest fire and the expanded usage of polymer insulators is presented through the analysis of mechanical and electrical characteristics and physical properties, and a study on the influence of forest fires on polymer insulators.
345㎸ 인천화력 송전선로 철탑도괴 원인분석 및 대책 (pp.323-324)
민병욱(Byeong-Wook Min),신태우(Tai-Woo Shin),최진성(Jin-Sung Choi),최한열(Han-Yeol Choi),박재웅(Jae-Ung Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
345㎸ Incheon Thermal Power Plant Transmission Line Collapse Analysis and Countermeasures. The Typhoon Galmaegi which had been formed in July 15, 2008 diminished into a tropical cyclone and cooled the air above the West Sea. The cooled air colliding with the warm inland air caused a strong whirlwind at some places in the west seaside; the whirlwind battered the 345㎸ Incheon Thermal Power Plant Transmission Line to be collapsed. The resistance against wind pressure, one of the key elements in transmission line engineering, is designed to endure the pressure corresponding to the maximum instantaneous wind speed. Before the above accident happened, no transmission line has ever been collapsed by a whirlwind. So this paper is aimed to analyze causes that collapsed 345㎸ Incheon Thermal Power Plant transmission line and to introduce countermeasures.
Jin Wook Jeong,Young Wook Park,Tae Hyun Park,Jin Hwan Choi,Hyun Ju Choi,Eun Ho Song,Jeong Ik Lee,Hye Yong Chu,Byeong Kwon Ju IEEE 2011 IEEE electron device letters Vol.32 No.3
<P>This letter reports on a study of the emission properties of organic light-emitting diodes (OLEDs) controlled by an organic photo sensor (OPS) based on poly-3-hexylthiophene (P3HT) and [6, 6]-phenyl-C<SUB>61</SUB> butyric acid methyl ester for emotional lighting applications. The emission characteristics exhibit the changes in the current and luminance of an OLED as a function of time when different illumination levels are exposed to the OPS. The luminance of the OLED increases from 283.4 to 1134 cd/m<SUP>2</SUP> when the OPS is exposed to different illumination levels from full dark to 500 mW/cm<SUP>2</SUP> using a xenon lamp.</P>
Young Wook Park,Hyun Ju Choi,Jin Hwan Choi,Tae Hyun Park,Jin-Wook Jeong,Eun Ho Song,Byeong Kwon Ju IEEE 2012 IEEE electron device letters Vol.33 No.8
<P>In this letter, we demonstrate high-performance organic light-emitting diodes (OLEDs) by matching various hole injection-transport layers (HITLs) with plasma surface treatments. The OLED device with pentacene HITL on CF<SUB>4</SUB>-plasma-treated indium tin oxide showed the highest performance due to relatively improved hole injection and the high-hole-mobility characteristics of the pentacene. Using a high-electron-mobility material as an electron transport layer to improve the carrier balance of electrons and holes, the electroluminescent efficiency was further improved. These methods are simple and promising for the enhancement of OLED performances. These findings will be applicable to mobile displays that feature low electric power consumption.</P>