http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
PMMA 유기 게이트 절연막의 농도와 두께에 따른 특성
유병철,공수철,신익섭,신상배,이학민,박형호,전형탁,장영철,장호정,Yoo, Byung-Chul,Gong, Su-Cheol,Shin, Ik-Sub,Shin, Sang-Bea,Lee, Hak-Min,Park, Hyung-Ho,Jeon, Hyung-Tag,Chang, Young-Chul,Chang, Ho-Jung 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.4
The MIM(metal-insulator-metal) capacitors with the Al/PMMA/ITO/Glass structures were manufactured according to various PMMA concentration of 1, 2, 4, 6, 8 wt%. The lowest leakage current and the largest capacitance were found to be 2.3 pA and 1.2 nF, respectively, for the device with 2 wt% PMMA concentration. The measured capacitance of the devices was almost same values with the calculated one. The optimum film thickness was obtained at the value of 48 nm, showing that the capacitance and leakage current were 1.92 nF, 0.3 pA at 2 wt%, respectively. From this experiment, the PMMA gate insulator films can be applicable to the organic thin film transistors.
크롬 취급 사업장의 작업환경 및 근로자 폭로 실태에 관한 연구
유병철,손병철,전진호,손혜숙,한용수,이채언,정운,Yu, Byung-Chul,Son, Byung-Chul,Jun, Jin-Ho,Han, Yong-Soo,Son, Hye-Sook,Lee, Chae-Eun,Jeong, Woon 대한예방의학회 1994 예방의학회지 Vol.27 No.3
For the purpose of providing the basic data for health management of workers who are exposed to chromium and for improving the quality of working environment, the authors evaluated blood and urinary level of chromium, the occupational history. AST, ALT, Hb, Hct, nasal specular examinaton on 287 workers who have been dealed chromium compounds in 56 manufacturing Industries of five types, that is, 38 metal plating services(plating),4 manufacture of other fabricated metal products (fabricated metal product), 5 manufacturing of dyestuff(dyestuff), 6 dressing and dyeing of leather(leather), 3 others(manufacture of pottery and ceramic househod wares, motor vehicles, electronic valves and tubes and other electronic components) and also measured the level of chromium in air from February to October 1993. The results were as follows ; 1. The utilized type of chromium compounds was the hexavalent state in plating fabricated metal product dyestuff, leather and the trivalent state in .other, and atmosperic chromium concentration as geometric mean was $0.0138mg/m^3(0.001{\sim}0.068mg/m^3)$ in plating, $0.0115mg/m^3(0.006{\sim}0.015mg/m^3)$ in fabricated matal product, $0.068mg/m^3(0.002{\sim}0.019mg/m^3)$ in dyestuff, $0.0083mg/m^3(0.002{\sim}0.028mg/m^3)$ in leather $0.0039mg/m^3(0.003{\sim}0.005mg/m^3)$ in other by the type of industry and it exceeded TLV-TWA ($0.05mg/m^3$) in five (13.6%) of plating services. 2. The geometric mean of chromium in blood was $1.54{\mu}g/dl(0.10{\sim}3.62{\mu}g/dl)$ in Plantng, $0.94{\mu}g/dl(0.27{\sim}2.82{\mu}g/dl)$ in fabricated metal product, $0.51{\mu}g/dl(0.10{\sim}3.25{\mu}g/dl)$ in dyestuff, $0.87{\mu}g/dl(0.15{\sim}8.00{\mu}g/dl)$ in leather, $0.55{\mu}g/dl(0.20{\sim}2.28{\mu}g/dl)$ in other by the type of industry(p<0.001). 3. The geometric mean of chromium in urine was $14.47{\mu}g/l(6.90{\sim}28.00{\mu}g/l)$ in planting, $4.63{\mu}g/l(0.24{\sim}43.00{\mu}g/l)$ in fabricated metal product, $5.93{\mu}g/l(1.00{\sim}33.00{\mu}g/l)$ in dyestuff, $11.09{\mu}g/l(0.80{\sim}48.00{\mu}g/l)$ in leather, $12.41{\mu}g/l(10.10{\sim}41.00{\mu}g/l)$ in other by the type of industry(p<0.001). 4. As the result of nasal specular examination, twenty four cases (8.4%) of nasal septal perforation among 287 total subjects was observed, and there were 17 (9.7%) cases in plating, 4 csaes (14.3%) in dressing and dyeing of leather. In the comparison of chromium concentration in blood and urine between the perforated group and non-perforated group, the perforated group showed a significantly higher value as $1.883{\pm}3.055{\mu}g/dl\;and\;0.793{\pm}0.815{\mu}g/dl$(P<0.001), $21.31{\pm}34.610{\mu}g/L\;and\;9.304{\pm}11.079{\mu}g/L$ (P<0.001). 5. The mean concentration of chromium in blood, urine and the mean level of AST, ALT, Hb and Hct in exposure group were higher than those of control group(p<0.001).
유병철,Yoo, Byung Chul 대한기계학회 1979 대한기계학회논문집 Vol.3 No.1
Methanol was examined as supplemental fuel for open chamber type and pre-combustion chamber type diesel engine. Pre-determined quantities of diesel oil were injected as ordinary diesel engines and methanol was added at inlet pipe using venturi, nozzel and and float chamber for the rest of the charge. In this mode of operation, addition of methanol reduced inlet and exhaust temperature. Inlet air quantities were essentially unchanged in spite of lower inlet temperature. Exhaust smoke was significantly reduced At light load when both diesel oil and methanol were introduced with small quantities, specific heat consumption was considerably increased. However, with the increase of the quantity of methanol or diesel oil, specific heat consumption was improved. With sufficient quantities of diesel oil enough to produce the power above 3/4 load, addition of methanol showed better thermal economy.
유병철(Byung Chul Yoo),김정순(Jung Soon Kim) 한국자동차공학회 1986 오토저널 Vol.8 No.1
The simulation of power cycle and unsteady gas exchange processes in the inlet and exhaust systems of the single-cylinder 2-stroke cycle compression ignition engine was studied in this paper.<br/> In power cycle process, the single-zone model proposed by Whitehouse and Way was used, and the convective and radiative heat transfer from cylinder contents to surroundings was considered. To solve the equations for gas exchange process, the generalized method of characteristics including area change, friction, heat transfer and entropy gradients was used. Also with the path line calculation, the entropy change along the path line and the variation of specific heat due to the change of temperature and the composition of cylinder gas were considered.<br/> As a result of the simulation, the change of pressure and temperature in the cylinder against the crank angle, the rate of net heat release, and the change of properties at each point in the inlet and exhaust pipe against the crank angle were obtained. The engine performances under various operating conditions were also calculated.
[論文] 4氣筒 4사이클 스파크 點火機關 吸·排氣 系統의 流動에 關한 硏究
유병철(Byung Chul Yoo),이정현(Jung Hyun Lee) 한국자동차공학회 1988 오토저널 Vol.10 No.1
When gas exchange process is to be calculated, the evaluation of the variation of the thermodynamic properties with time and position in the intake and exhaust system is required. For this purpose the application of the method of characteristics to the gas exchange process is known as the best method. In order to apply the method of characteristics, the gas flow at carburettor and inlet and exhaust valves must be replaced by some simple models by which thermodynamic properties can be calculated easily giving good agreement with actual values.<br/> In this study, the carburettor is represented by an adiabatic pressure loss model. In this model resistance coefficients of carburettor are obtained by experiment. Using these resistance coefficients the pressure drop at carburettor can be calculated.<br/> In order to select adequate average discharge coefficients for the inlet and exhaust valves, mass flow rate through intake and exhaust system is calculated by the method of characteristics using above resistance coefficient at specific engine operating condition and then it is compared with measured mass flow rate. The discharge coefficient is determined so that calculated mass flow rate gives good agreement with the measured mass flow rate.<br/> For the engine used in this study average discharge coefficient of 0.6 gives good agreement with the measured mass flow rate over the whole engine operating conditions.
유병철(Byung-Chul You),조인희(In-Hee Cho) 한국엔터테인먼트산업학회 2014 한국엔터테인먼트산업학회 학술대회 논문집 Vol.2014 No.5
본 연구의 목적은 뉴스 특보가 보도전문채널의 시청률 변화에 어떤 영향을 미치는지를 알아보는 것이다. 분석을 위해 세월호 침몰 사고 기간의 뉴스Y(연합뉴스TV) 뉴스 특보 시청률를 분석했다. 사고 이전과 사고 이후 특보 체제, 종일 특보 이후로 기간을 설정해 비교분석했다. 연구 결과 특보 이후 시청률이 증가했고, ‘특보-특보 후’를 제외하곤 모두 통계적으로 유의한 차이가 있었다. 시청자 층에서도 젊고, 고소득, 고학력 시청자들의 시청률이 높아졌다. 탐색적으로 홈페이지 PV(page view)를 분석한 결과 ‘특보 전-특보’ 기간의 차이가 나타났다 The object of this study is to analyze how breaking news reports effect the broadcaster"s rating. In order to get this analysis, this study drew a comparison and analyzed "News Y"(Yonhapnews TV)"s special reports, during the Sewol ferry disaster. News Y"s rating was caompared before covering the Sewol ferry disaster after the covering these reports and analyzed the channel rating. This study concluded that News Y"s rating was increased after covering the disater. Special news reports were a great factor to program rating in the news channel.