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한재원(Jae Won Hahn),김용우(Yongwoo Kim),정호원(Howon Jung),김석(Seok Kim),장진희(Jinhee Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
For decays, laser direct writing (LDW) is widely used for material processing of high precision engineering. The technique takes an important role in micro scale fabrication / manufacturing. In general, LDW uses beam spot focused by refractive optics and the scale of processing is mainly determined by diffraction limit. The resolution of commercially available system is about 500 ㎚. In this paper, we introduce high resolution LDW process using solid immersion lens probe or nano aperture probe which scans sample surface in contact mode assembled with LDW system. These probes are protected by diamond like carbon film for high durability. Using these contact probes, we achieved resolution up to 50 ㎚ and relatively high scan speed about 10 ㎜/s, which is several hundred times faster than conventional near-field scanning optical microscope scheme. The speed is comparable to conventional system and we expect these schemes can be practically used for fabrication system.
배연가스의 $NO_x$제거용 코로나 방전장치에서 OH 발광 스펙트럼 측정 및 관련 반응 연구
박철웅,한재원,신동남,Park, Chul-Woung,Hahn, Jae-Won,Shin, Dong-Nam 한국연소학회 1999 한국연소학회지 Vol.4 No.1
We constructed a wire-cylinder type pulsed corona discharge system for $NO_x$ removal, which was operated in room temperature. A emission spectrometer was built with a boxcar averager and monochrometer equipped with photo-multiplier tube detector. The sensitivity of the emission spectrometer was greatly improved by synchronizing the emission spectrometer with pulsed corona discharge system using a triggered spark-gap switch. $N_2$ spectrum($c^3{\Pi}_u{\rightarrow}X^1{\Sigma}_g{^+}$) was measured in the range of 300 - 450 nm and oxidizing OH radical emission($A^2{\Sigma}^+{\rightarrow}X^2{\Pi}$) was measured in case $N_2$ was supplied with water bubbling. As wet gas composition of inlet $N_2$ supplied in the discharge system increased, the intensity of OH emission was increased and saturated at wet gas composition 50%. We also investigated additive effect of $C_2H_4,\;H_2O,\;H_2O_2$ on the intensity of OR emission and $NO/NO_2/NO_x$ reduction and analysed the related reaction mechanism in corona discharge process. $H_2O_2$ additive increased the intensity of OH emission and $NO/NO_x$ reduction.
이종호,이승영,한재원,장영준,전충환,Lee, Jong-Ho,Lee, Seung-Young,Hahn, Jae-Won,Chang, Young-June,Jeon, Chung-Hwan 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.7
Co-flow axisymmetric laminar premixed flame of methane was used to study the influence of air temperature and $N_2$ addition on the flame structure, temperature field and emission characteristics. OH 2-D images and temperatures along the centerline were measured experimentally by PLIF and CARS techniques respectively to observe the influences of dilution and thermal effects of $N_2$ in the gas mixture. Also, the concentration of NOx was measured at each condition by gas analyser to see the suppression effect of N2 addition on NOx emissions. It was found that OH concentrations distribute widely as air temperature goes higher, while the effect of $N_2$ addition is not significant. But $N_2$ addition highly contributes to the flame front and NOx emissions which was argued to be due to the reduction of flame temperature. In accordance with experimental study, numerical simulation using CHEMKlN code was carried out to compare the temperature results with those acquired by CARS measurement, and we could find that there is good agreement between those results.