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오제명 ( Ze Myoung Oh ) 한국브레히트학회 2007 브레히트와 현대연극 Vol.16 No.-
In der Weimarer Zeit traten die neuen technischen Medien wie das Radio, der Film und die Schallpatten mit den traditionellen Medien wie der Buhne und der Literatur in Konkurrenz. Bei dem Dramatiker Bertolt Brecht, der schon in den zwanziger Jahren mit verschiedenen Medien gearbeitet hatte, ubten die Erfahrungen mit den technischen Medien auf die Entwicklung seiner Theaterkonzeption und Asthetik einen wesentlichen Einfluß aus. Andererseits hat sich seit dem 2. Weltkrieg eine starke Bedeutung von Medien durchgesetzt, vor allem dem Einfluss des kanadischen Medientheoretiker Marschall McLuhan. Er betrachtet das Medium als einen Trager von Informationen, der diese nicht mehr oder weniger neutral vermittelt, sondern sie grundsatzlich pragt, sich ihnen medienspezifisch einschreibt und dadurch dem menschlichen Zugriff auf Wirklichkeit Form verleiht. In dieser Untersuchung wird versucht, durch den Vergleich zwischen den Medientheorien von Brecht und McLuhan die Position der Brechtschen Medienkonzeptionen zu bestimmen. Bei den Medienkonzeptionen von Brecht und McLuhanIn ist es gemeinsam, dass die Anwendung der Medien fur die Menschen notwendig ist und die Medien die Wahrnemuhung der Menschen beeinflußen. In seinem "Dreigroschenprozeß" legte Brecht fest, daß die Geistesarbeiter in dem technischen Zeiteralter ganz wie die Korperarbeiter nicht mehr in der Lage sind, ohne Instrumet eine konkurrenzfahiges Produkt zu erzeugen. Dadurch sind die Schriftsteller und die Kunstler, bewußt oder unbewußt, schon Produzenten geworden, fur die die Produktionsmittel notig sind. Brecht betrachtet das Medium als die unentbehrliche Produktionsmittel, wahrend McLuhandie Medien fur "an extention of man" hielt. McLuhan behauptete, dass das Medium an sich die Botschaft sei, und dass der Inhalt des Mediums dabei ganz irrelevant sei. Fur Brecht ist nicht nur die Form des Mediums, sondern auch dessen Inhalt auch wichtig. Fur McLuhan durchsetzt sich die Technik fur sich, aber die Verwirklichung der Medien hielt Brecht fur sozial und geschichlich bedingt.
세라믹 분말을 이용한 오일 기지 나노유체의 열적거동 평가
최철,유현성,오제명,Choi, Cheol,Yoo, Hyun-Sung,Oh, Je-Myung 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
Oil-based nanofluids were prepared by dispersing spherical and fiber shaped $Al_2O_3$ and AlN nanoparticles in transformer oil. Two hydrophobic surface modification processes using oleic acid (OA) and polyoxyethylene alkyl acid ester (PAAE) were compared in this study. The dispersion stability, viscosity and breakdown voltage of the nanofluids were also characterized. $(Al_2O_3+AlN)$ mixed nanofluid was prepared to take an advantage of the excellent thermal conductivity of AlN and a good convective heat transfer property of fiber shaped $Al_2O_3$. For $(Al_2O_3+AlN)$ particles with 1 % volume fraction in oil, the enhancement of thermal conductivity and convective heat transfer coefficient was nearly 11 % and 30 %, respectively, compared to pure transformer oil. The nanofluid, containing $Al_2O_3+AlN$, successfully lowered the temperature of the heating element and oil itself during a natural convection test using a prototype transformer.
변압기 냉각용 오일 기지 나노유체의 제조조건이 열 및 전기적 특성에 미치는 영향
최철,유현성,오제명,Choi, Cheol,Yoo, Hyun-Sung,Oh, Jae-Myung 한국재료학회 2007 한국재료학회지 Vol.17 No.9
Oil-based nanofluids were prepared by dispersing nonconducting fibrous $Al_2O_3$ and spherical AlN nanoparticles in transformer oil. In this study, the effects of wet grinding and surface modification of particles on thermal and electrical properties of nanofluids were investigated. Grinding experiments were conducted with high-speed bead mill and ultrasonic homogenizer and nanoparticles were surface modified by oleic acid and polyoxyethylene alkyl acid ester(PAAE) in n-hexane or transformer oil, at the same time. It is obvious that the combination of nanoparticle, dispersant and dispersion solvent is very important for the dispersity of nanofluids. For nanofluids containing 1.0vol.% AlN particles in transformer oil, the enhancement of thermal conductivity was 11.6% compared with pure transformer oil. However, the electric-insulating property of AlN nanofluids was very low due to used dispersant itself. Therefore, the effect of the dispersant on thermal/electrical/physical properties of the transformer oil should be considered before selecting a proper dispersant.
탄소 나노소재를 이용한 윤활유 기반 나노유체의 제조 및 평가
최철,정미희,오제명,Choi, Cheol,Jung, Mi-Hee,Oh, Jae-Myung 한국재료학회 2009 한국재료학회지 Vol.19 No.3
Lubricant-based nanofluids were prepared by dispersing carbon nanoparticles in gear oil. In this study, the effects of the particle size, shape and dispersity of the particles on the tribological properties of nanofluids were investigated. Dispersion experiments were conducted with a high-speed bead mill and an ultrasonic homogenizer, and the surfaces of the nanoparticles were simultaneously modified with several dispersants. The effective thermal conductivity of the nanofluids was measured by the transient hot-wire method, and the tribological behaviors of the nanofluids were also investigated with a disk-on-disk tribo-tester. The results of this study clearly showed that the combination of the nanoparticles, the deagglomeration process, the dispersant and the dispersion solvent is very important for the dispersity and tribological properties of nanofluids. Lubricant-based nanofluids showed relatively low thermal conductivity enhancement, but they were highly effective in decreasing the frictional heat that was generated. For nanofluids containing 0.1vol.% graphite particles in an oil lubricant, The friction coefficient in the boundary and fluid lubrication range was reduced to approximately 70% of the original value of pure lubricant.
최철,정미희,최영민,오제명,Choi, Cheol,Jung, Mi-Hee,Choi, Young-Min,Oh, Jae-Myung 한국재료학회 2008 한국재료학회지 Vol.18 No.11
Oil-based nanofluids were prepared by dispersing Ag, graphite and carbon black nanoparticles in lubricating oil. Agglomerated nanoparticles were dispersed evenly with a high-speed bead mill and/or ultrasonic homogenizer, and the surfaces of the nanoparticles were modified simultaneously with several dispersants. Their tribological behaviors were evaluated with a pin-on-disk, disk-on-disk and four-ball EP and wear tester. It is obvious that the optimal combination of nanoparticles, surfactants and surface modification process is very important for the dispersity of nanofluids, and it eventually affects the tribological properties as a controlling factor. Results indicate that a relatively larger size and higher concentration of nanoparticles lead to better load-carrying capacity. In contrast, the use of a smaller size and lower concentration of particles is recommended for reducing the friction coefficient of lubricating oil. Moreover, nanofluids with mixed nanoparticles of Ag and graphite are more suitable for the improvement of load-carrying capacity and antiwear properties.
송현우,최철,최경식,오제명,Song Hyunwoo,Choi Cheol,Choi Kyungshik,Oh Jemyung 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
Two different nanofluids were prepared by dispersing $Al_{2}O_3$ nanoparticles in transformer oil after hydrophobic surface modification. The agglomerated alumina nanoparticles with diameters from ${\mu}m$ to mm were ball-milled and then treated with surfactants such as lauric acid, stearic acid and oleic acid. The surface characteristics of modified nanoparticles were examined by FTIR spectroscopy. It showed that the hydrophobicity of nanoparticles was caused by esterification between hydroxyl groups on the particle surface and functional groups of surfactant. The shape and size distribution of ball-milled particles were analyzed by TEM and PSA. The results compared with the primary particles indicated that the size distributions of nanoparticles were dependant on milling times. The dispersion stability of modified nanoparticles dispersed in oil was highly dependent on the composition and amounts of surfactants.