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문창성,김준현,최석우,김주현 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Recently, coated milling cutters are widely used for improving the productivity of cutting processes through high speed cutting and longer tool life. In metal cutting, cutting force increase rate is important factor to diagnose the cutting conditions because the amount of tool wear directly influences the cutting forces. As the cutting length increases, the worn cutter increases the cutting forces. In this study, the effect of coating process of end milling cutter on the cutting performance, especially on the cutting force increase rate, is investigated. The results acquired through the cutting test measuring cutting force increase rate show that not only the injection quantity of N₂ and Ar but also mean temperature influence the cutting force increase rate during the end milling process.
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.
양이온 고분자전해질의 수중 입자의 응집에 미치는 교반강도 및 주입량의 영향
감상규,문창성,김대경,고병철,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-
Using several cationic polyelectrolytes of different charge density and molecular weight as flocculants and a simple continuous optical technique(photometric dispersion analyzer, PDA), the effects of mixing intensity and polyelectrolyte dosage on flocculation of kaoline particles(35 NTU) and particles(34.7 NTU) in Kangjung reversior of heavy rainfall have been examined. The optimum mixing was obtained at the stirring of 200rpm(G= 869 s^-1). The charge density of a polyelectrolyte is important in determining the optimum dosage and in the removl of particles. The optimum dosage is less for the polyelectrolyte of higher charge density and at the dosage, the removal of particles is higher for the polyelectrolyte of higher charge density and zeta potential of particles reaches to near zero. The optimum dosage for the removal of particles should be determined by flocculation test and not be determined by the turbidity of particles in water.