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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).
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.
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) 한국형사정책학회 2015 刑事政策 Vol.27 No.1
This article relates to criminological implications how physical circumstances and psychological experiences harmfully affect death-row prisoners. They should have been executed right after their final verdict, however, they have endured their life for long period of time without execution. Since they can be put to death legally and practically at any time, they have lived under the extreme stresses and experienced deathlike fears for the long time. With a stigmatized red name-tag outrightly different from others, their everyday life on a death row has been lonely and disconnected causing the fear of death. None has discussed the so-called death-row syndrome and the circumstances and experiences of death-row prisoners in Korea. As an active prison warden, the author interviewed in-depth thirteen convicts on death-row and analysed qualitatively their narratives about their physical circumstances and psychological experiences. Recently they could get along with other prisoners in prison cells and participated in working at prison factories. For all the changed conditions of death-row prisoners, the article discloses that their conditions and experiences relate to the so-called death-row syndrome. It is proved by delayed execution, poor conditions, and deteriorated psychological sufferings. Therefore, death-row syndrome should be considered on the issues of the abolition and execution of death penalty.
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.