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이양두,이정아,문승일,박정훈,한종훈,유재은,이윤희,남산,주병권,Lee, Yang-Doo,Lee, Jung-Ah,Moon, Seung-Il,Park, Jeung-Hoon,Han, Jong-Hun,Yoo, Jae-Eun,Lee, Yun-Hi,Nahm, Sahn,Ju, Byeong-Kwon 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.5
Multi- wall carbon nanotubes(MWNTs) were synthesized by thermal chemical vapor deposition. The paste for screen printing was composed of MWNTs, organic vehicle and glass frit. Carton nanotube paste was screen-printed on ITO(indium tin oxide) deposited soda lim을 glass, and then heat treatment was performed. Before the surface treatment, turn on field of derive was 2.6 V/$\mu\textrm{m}$. After the surface treatment, the value was changed into 1.8 V/$\mu\textrm{m}$. The anode current of the derive with 2.83 V/$\mu\textrm{m}$(turn on field) was changed 4 $\mu\textrm{A}$ into 390 $\mu\textrm{A}$ at 1,700 V. Adsorption effect of MWNTs onto phosphor of anode plate was observed by the field emission measurement and resulted in bad effects on properties of devices lifetime and emission lighting.
유리기판 위에 성장된 탄소나노튜브를 이용한 평판 램프의 전계방출 특성
이양두,문승일,한종훈,이윤희,주병권,Lee, Yang-Doo,Moon, Seung-Il,Han, Jong-Hun,Lee, Yun-Hi,Ju, Byeong-Kwon 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
We fabricated the 1-inch diode type flat lamp using CNTs, which were grown directly on soda-lime glass substrate at 600 ∼ 650 $^{\circ}C$ by thermal chemical vapor deposition(CVD) of acetylene gas. Turn- on field was about 2.8 V/${\mu}{\textrm}{m}$. We observed that uniform and high brightness had been obtained. The brightness of CNT flat lamp was measured up to about 14 kcd/$m^2$ at 2000V in spacing of 500 ${\mu}{\textrm}{m}$. The results showed that the CNTs were very good emission source and suitable for application in the lamp.
양두용,이규송 한국생태학회 2010 Journal of Ecology and Environment Vol.33 No.3
This research identified a disturbance regime caused by wild boar in a mature Quercus mongolica forest and analyzed the impact of this disturbance on the structure and distribution of herbaceous plants in Mt. Jeombong, Korea. We demonstrate that disturbance by wild boar was most frequent from winter to early spring, but also occurred year round. Areas which were frequently disturbed by wild boar included the mountain ridge, the mild slope on the north face, and sites with high concentration of Erythronium japonicum. The disturbance cycle by the wild boar in this region was estimated at approximately 2.8 years. The wild boar’s reduced the community’s species diversity and herbaceous coverage, and increased its evenness. This disturbance reduced the coverage of spring ephemeral; Veratrum nigrum var. ussuriense, Symplocarpus niponnicus, Anemone koraiensis and Corydalis turtschaninovii were particularly sensitive. In addition, summer green herbaceous plants such as Astilbe chinensis, Ainsliaea acerifolia, Meehania urticifolia, and Pimpinella brachycarpa were sensitive to the wild boar’s. It was found that wild boar ate E. japonicum most selectively of all plants in this investigation area. In conclusion, together with micro-topography, wind, formation of gaps of a forest and rearrangement of litter layer, wild boar’s disturbance is an important factor influencing the dynamic changes of an herbaceous community in a mature temperate hardwood forest.
광기능 폴리다이아세틸렌 초분자의 Chemical-Chip 응용
양두호,최현,김은진,안동준 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
생체막을 모방한 폴리다이아세틸렌(polydiacetylene) 초분자는 온도, 기계적자극, pH 그리고 solvent 등의 외부자극에 의하여 청색(640nm)에서 적색(540nm)으로 색전이된다. 그리고 이러한 특성을 이용하여 cholera toxin, influenza virus, E-coli. 등을 검출할 수 있는 센서에 응용하고자 하는 연구가 진행되어 왔다. 본 연구에서는 DNA 칩이나 단백질 칩과 같이 micro array 형태로 폴리다이아세틸렌 초분자를 NH2로 처리한 유리 기판에 표면 패턴화한다. 표면 패턴화는 NHS와 NH2 사이에 amidization으로 유리 기판에 고정화한다. 패턴화된 유리 기판에 cyclodextrin(CD), polyallylamine (PAA), polyvinylalcohol(PVA), Glucose, vapor phase인 NH3과 HCl을 반응시켰다. CD, PAA, PVA, NH3, HCl는 초분자와 직접, Glucose는 Enzyme을 초분자에 고정화한 후 반응하였다. 그 결과 특정 초분자만 반응하여 색전이 되는 것을 fluorescence로 확인하였다. 그리고 초분자 표면에 ligands를 고정화하여 다양한 물질을 검출 가능할 것이다. 이는 유리 기판상에 센서의 기능을 가지고 있는 다양한 폴리다이아세틸렌 개발에 적용될것이다.
NOISE Spectroscopy: Applications to Solid State NMR
양두경,D. B. Zax 한국자기공명학회 2002 Journal of the Korean Magnetic Resonance Society Vol.6 No.2
One of the oldest, still unsolved, and often ignored problems in magnetic resonance remains the issue of how to observe undistorted, normal one-dimensional spectra where the frequencies and their relative intensities represent faithfully the distribution of spins and sites in the sample within the magnet. Often distortions in these parameters are accepted, as the price of sensitivity enhancement, or because it is unclear just how these distortions might be avoided. Surprisingly enough, the problem is exacerbated by the use of modern techniques of pulsed Fourier transform NMR. Noise spectroscopy is an approach to solving the problem of distorted NMR spectra, which is largely under appreciated; it promises virtually “unlimited” distortionless bandwidths without costly hardware investments. Nonetheless, its exploitation remains limited. We will discuss why noise spectroscopy belongs in the arsenal of tricks spectroscopists should be aware of, show examples where its use is essential if accurate, quantitative NMR is to be expected, and discuss some recent approaches which extend its applicability yet further, particularly in solid state NMR and in applications to quadrupolar nuclear spins. 영어논문