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Effects of Transverse Magnetic Field on Laser-produced Carbon Plasma Plume in Nitrogen Atmosphere
남상환,Min Jung Ko,Mi Ae Lee,박혜선,송재규,박승민 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.5
By adopting a time-resolved optical emission spectrometry, we have investigated the effects of transverse magnetic field on C2 and CN molecules produced by laser ablation of a graphite target in nitrogen atmosphere. We found that the spectroscopic temperatures of both species, obtained via simulation of the optical emission spectra, as well as their emission intensities from the electronically excited states increased significantly in the presence of a magnetic field. The cyclotron radii and frequencies for electrons and ions were estimated to explain the increase in the number of collisions in the laser-produced carbon plasma plume under a magnetic field.
남택용(Taekyong Nam),김미순(Misoon Kim),궁상환(Sanghwan Kung),이영희(Younghee Lee),홍진표(Jun Pyo Hong) 한국정보과학회 1990 한국정보과학회 학술발표논문집 Vol.17 No.2
The paper describes an operations system newly designed to establish the network management and provisioning functions for CCS(Common Channel Signaling) network, being currently deployed in Korea. SIGNOS(Signaling Network Operations System), which is a sort of centralized system to accommodate a number of SMX-Is(Signaling Message Exchange), so called STP, consistently monitors and maintains CCS network in the network wide view to assure efficient utilization of the network In the paper, the system architecture and functions of SIGNOS are mainly concerned and, as a introductory remarks, the fundamental concepts of CCS network and its applicable areas referred to related CCITT recommendations are also mentioned.
조상환(Sanghwan Cho),남연우(Younwoo Nam),최유열(Yoo youl Choi),이원남(Wonnam Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
The characteristic of soot formation from the newly developed high-temperature flow reactor type soot generator furnace has been experimentally investigated. The possibility of control of primary particle size and soot concentration was confirmed by experiments using propylene and n-hexane, which are gaseous and liquid fuels. The competition between reaction (soot formation) time scale and flow (residence) time scale seem to be the most important factor for the soot primary particle size and concentration. The desired primary particle size and soot concentration could be obtained by controlling the fuel concentration and residence time at the nominal operating temperature of 1300˚C.