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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.
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>
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.
민병욱(Byeong-Wook Min),김종화(Jong-Hwa Kim),최석준(Seok-June Choi),방항권(Hang-Kwon Bang),최한열(Han-Yeol Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
KEPCO constructed the first 765㎸ 2 circuit transmission line in the world with its home grown technologies. Through this 765 ㎸ transmission system project, KEPCO accumulated experience and technologies related to the 765 ㎸ power system. Based on the successful completion of the 765㎸ transmission project, KEPCO is conducting overseas business by using its abundant experience and know-how. In particular, KEPCO developed the training course for power system, called the ATT (Advanced Transmission Technology) training courses for overseas business, especially for developing countries. Therefore, KEPCO developed the "Transmission line design system for overseas projects". This system supports the calculation of wind pressure load, tower design, wire selection, insulation design, etc. by applying the meteorological data of foreign countries and design standards. And this system is applied to the training program so that the trainees can design the optimal transmission line for their own countries.
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>
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>
최병옥(Byeong Ock Choi),강기문(Ki Mun Kang),장홍석(Hong Seok Jang),이상욱(Sang-wook Lee),강영남(Young Nam Kang),채규영(Gyu Young Chai),최일봉(Ihl Bhong Choi) 대한방사선종양학회 2005 Radiation Oncology Journal Vol.23 No.2
목 적: 원발성 간암에서 근치적 목적의 방사선치료 결과에 대한 문헌상 보고는 드물다. 이에 저자들이 경험한 원발 성 간암의 분할 정위방사선치료에 대한 결과를 보고하고자 하였다. 대상 및 방법: 1999년 7월부터 2002년 3월까지 원발성 간암으로 조직학적 진단을 받은 후 분할 정위방사선치료를 시행한 20명을 대상으로 후향적 분석을 하였다. 종양의 장경은 2∼6.5 cm (평균: 3.8 cm)였다. 분할 정위방사선치료는 1회 조사량으로 5와 10 Gy였고 선량은 계획용 표적체적(planning target volume)에 맞추어 처방하였으며 회전중심점 선량의 85∼90% 등선량 곡선에 치료를 하였다. 주 3∼5회 치료하여 2주 동안 총 50 Gy를 조사하였다(중앙선량: 50 Gy). 추적관찰기간은 3∼55개월(중간 추적관찰기간: 23개월)이었다.결 과: 전체 치료 반응률은 60%이었으며 완전 반응 4명(20%), 부분 반응 8명(40%), 안정성 병변이 8명(40%)이었다. 전체 환자의 1년 및 2년 생존율은 각각 70%, 43.1%이었으며 중앙 생존기간은 20개월이었다. 1년 및 2년 무병 생존 율은 각각 65%, 32.5%이었으며 중앙 무병생존기간은 19개월이었다. 치료 부작용으로 소화장애가 16명(60%), 오심/ 구토가 8명(40%), 간 기능 저하가 6명(30%)에서 발생하였으나 부작용에 의한 사망은 없었다. 결 론: 원발성 간암의 분할 정위방사선치료는 비교적 안전하고 효과적인 방법이었다. 따라서 단일 병변이면서 비교적 종양의 크기가 작은 간암에서 내과적으로 수술이 불가능하거나 수술을 거부하는 환자에서 국소 치료방법으로 고려할 수 있을 것으로 사료된다. Purpose: Reports on the outcome of curative radiotherapy for the primary hepatocellular carcinoma (HCC) are rarely encountered in the literature. In this study, we report our experience of a clinical trial where fractionated stereotactic radiotherapy (SRT) was used in treating a primary HCC. Materials and Methods: A retrospective analysis was performed on 20 patients who had been histologically diagnosed as HCC and treated by fractionated SRT. The long diameter of tumor measured by CT was 2∼6.5 cm (average: 3.8 cm). A single dose of radiation used in fractionated SRT was 5 or 10 Gy; each dose was prescribed based on the planning target volume and normalized to 85∼99% isocenter dose. Patients were treated 3∼5 times per week for 2 weeks, with each receiving a total dose of 50 Gy (the median dose: 50 Gy). The follow up period was 3∼55 months (the median follow up period: 23 months). Results: The response rate was 60% (12 patients), with 4 patients showing complete response (20%), 8 patients showing partial response (40%), and 8 patients showing stable disease (40%). The 1-year and 2-year survival rates were 70.0% and 43.1%, respectively, and the median survival time was 20 months. The 1-year and 2-year disease free survival rates were 65% and 32.5%, respectively, and the median disease-free survival rate was 19 months. Some acute complications of the treatment were noted as follows: dyspepsia in 12 patients (60%), nausea/emesis in 8 patients (40%), and transient liver function impairment in 6 patients (30%). However, there was no treatment related death. Conclusion: The study indicates that fractionated SRT is a relatively safe and effective method for treating primary HCC. Thus, fractionated SRT may be suggested as a local treatment for HCC of small lesion and containing a single lesion, when the patients are inoperable or operation is refused by the patients. We thought that fractionated SRT is a challenging treatment modality for the HCC.