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Symmetric space, geometry and topology
김인강 대한수학회 2007 대한수학회지 Vol.44 No.5
In this note we survey some recent results on symmetricspace, and related topics like rigidity, exibility and geometry-topologyaspect of symmetric space, specially in the line of hyperbolic 3-manifolds.
Optical characteristics of amorphous V2O5 thin films colored by an excimer laser
강만일,오은지,김인구,김석원,류지욱,김용기 한국물리학회 2012 Current Applied Physics Vol.12 No.2
The V2O5 films were prepared by an RF sputtering method, and the amorphous films were colored by an UV excimer laser. The crystallinity of the as-grown V2O5 film was degenerated greatly by laser irradiation,as determined by X-ray diffraction (XRD) and Raman studies. The transmission and complex refractive index spectra of the V2O5 film were affected by variations in the microstructure, including the surface morphology, crystalline structure, and substoichiometry with an oxygen deficiency. Considerable emissions due to oxygen vacancies and band transition of photoluminescence (PL) peaks were observed,and the peaks were significantly changed after laser irradiation. The variations in the optical properties in both films may be attributed to oxygen deficiency induced by laser irradiation.
Optical Properties of Sputtered Indium-tin-oxide Thin Films
강만일,김인구,추민우,김석원,류지욱 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
Indium-tin-oxide (ITO) thin films, used as transparent conductive electrodes in various optoelectronics fields, were prepared via RF sputtering at different substrate temperatures. The effects of substrate temperature on the optical properties were investigated. The structures and the optical constants of the films were successfully analyzed using the classical formula. The microstructures and the resistances of ITO films were strongly influenced by the substrate temperature, and the optical properties of the films significantly changed with variations in the microstructure and the resistance induced by increasing the substrate temperature. The reduction of the resistance, indicating an increase in the free electron concentration, induced a Burstein-Moss shift in the UV region and a Drude absorption in the near infrared (NIR) region.
추민우,김인구,강만일,김석원 한국물리학회 2010 새물리 Vol.60 No.5
In order to investigate the influence of heat generated in electric wires on Ohm's law, we constructed solenoids by winding enamel wires on cylindrical cores made of aluminum and copper, and we observed the variations in the I-V curves with changing temperature caused by the applied current. The result shows that the non-linearity of Ohm's law increased with rising temperature of the coils. A qualitative analysis was realized by using the thermal conductivity and the specifics of the cores and showed that the variation of the resistance caused by the generation of heat in the coils was inversely proportional to the thermal coupling coefficient of the cores and that the non-linearity of Ohm's law was larger for cores with increased thermal coupling coefficients. 전선에서의 발열이 옴(Ohm)의 법칙에 미치는 영향을 알아보고자 Al과 Cu 코어에 에나멜선을 감아서 솔레노이드 형태로 제작하여 전류가 흐를 때의온도 변화에 따른 전류-전압 그래프의 변화를 고찰하였다. 그 결과코일의 온도가 증가함에 따라 옴의 법칙의 비선형성은 증가하였으며코어의 열전도도와 비열을 이용하여 정량적인 해석이 이루어졌다. 또한발열에 의한 저항변화는 코어의 열류계수에 반비례적인 의존성을보였으며 또한 코어의 열류계수가 증가함에 따라 옴의 법칙의 비선형성은증가하였다.