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CFUBMS을 이용한 TiZrAlN 나노복합 박막의 미세 구조와 기계적 특성
김연준(Youn J. Kim),이호영(Ho Y. Lee),김용모(Yong M. Kim),김갑석(Kab S. Kim),한전건(Jeon G. Han) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.1
Quaternary TiZrAlN nanocomposite thin films were synthesized by Closed-Field Unbalanced Magnetron Sputtering (CFUBMS), and their microstructure and mechanical characteristics were examined. The grain refinement of the TiZrAlN nanocomposite thin films was controlled by adjusting the N₂ partial pressure. The hardness of the film varied with the N₂ partial pressure and the maximum value was obtained approximately 47 ㎬. It was also confirmed that there is a critical value of the grain size (dc) to need maximum hardness.
폴리머 기판상에 합성된 저온 ITO 박막에 미치는 Ar + H₂ 플라즈마의 영향
문창성(Chang S. Moon),정윤모(Yun M. Chung),이호영(Ho Y. Lee),김용모(Yong M. Kim),김갑석(Kab S. Kim),M. Gaillard,한전건(Jeon G. Han) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.5
Indium tin oxide (ITO) films were synthesized on polymer (PES, polyethersulfone) at room temperature by pulsed DC magnetron sputtering. By the control of introducing hydrogen to argon atmosphere, the resistivity of ITO films was obtained at 5.27 × 10<SUP>?4</SUP> Ω · ㎝ without substrate heating in comparison with 2.65 × 10<SUP>?3</SUP> Ω · ㎝ under hydrogen free condition. ITO film synthesized at Ar condition was changed from amorphous to crystalline. These result from the enhancement of electron temperature in Ar + H₂ plasma, which induces the increase of ionization of target materials and argon. The dominant increase of ions such as In Ⅱ and O Ⅱ and neutral Sn Ⅰ was monitored by optical emission spectroscopy (OES). Thermal energy required for the crystalline film formation is compensated by kinetic energy transfer through ion bombardments to substrate.
고압 분무 연소장에서 연료 분무의 자발화 및 연소 과정 해석
강성모,김용모,유용욱 한국액체미립화학회 2000 한국액체미립화학회지 Vol.5 No.4
The present study is mainly motivated to investigate the vaporization, auto-ignition and combustion processes in the high-pressure engine conditions. The high-pressure vaporization model is developed to realistically simulate the spray dynamics and vaporization characteristics in high-pressure and high-temperature environment. The interaction between chemistry and turbulence is treated by employing the Representative Interactive Flamelet (RIF) Model. The detailed chemistry of 114 elementary steps and 44 chemical species is adopted for the n-heptane/air reaction. In order to account for the spatial inhomogeneity of the scalar dissipation rate, the multiple RIFs are introduced. Numerical results indicate that the RIF approach together with the high-pressure vaporization model successfully predicts the ignition delay time and location as well as the essential features of a spray ignition and combustion processes.