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성낙진(Nak-Jin Seong),김상남(Sang-Nam Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Energy distribution function for electrons in SF. -Ar mixtures gas used by MCS-BEq algorithm has been analysed over the E/N range 30~300[Td] by a two term Boltzmann equation and by a Monte Carlo Simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2[%] and 0.5[%] SF. -Ar mixtures were measured by time-of-flight (TOF) method, The results show that the deduced longitudinal diffusion coefficients and transverse diffusion coefficients agree reasonably well with theoretical for a rang of E/N values The results obtained from Boltzmann equation method and Monte Carlo simulation have been compared with present and previously obtained data and respective set of electron collision cross sections of the molecules.
MCS-BEq 알고리즘에 의한 SiH₄ 기체의 전자수송특성
김상남(Sang-Nam Kim),성낙진(Nak-Jin Seong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, energy distribution function in SiH₄ has been analysed over the E/N range 0.5~300Td and Pressure value 0.5, 1.0. 2.5 Torr by a two-term approximation Boltzmann equation method and by a Monte Carlo simulation. The motion has been calculated to give swarm parameters for the electron drift velocity, diffusion coefficient. electron ionization, mean energy and the electron energy distribution function. The electron energy distribution function has been analysed in SiH₄ at E/N = 30, 50Td for a case of the equilibrium region in the mean electron energy and respective set of electron collision cross sections. The results show that the deduced electron drift velocities, the electron ionization or attachment coefficients, longitudinal and transverse diffusion coefficients and mean energy agree reasonably well with theoretical for a rang of E/N values.
표적신호 시뮬레이션 요소로서 원통형 몰수체의 충격응답의 특성
김재수,성낙진,이상영,김강,유명종,조운현,Kim, Jae-Soo,Seong, Nak-Jin,Lee, Sang-Young,Kim, Kang,Yu, Myong-Jong,Cho, Woon-Hyun 한국음향학회 1994 韓國音響學會誌 Vol.13 No.e2
능동소나에서 표적에 의해 산란된 표적신호를 합성하기 위해서는 반사점(Highlight, 이하 HL)에서의 산란현상의 이해가 선행되어야 한다. 본 논문에서는 음향수조실험에서 얻어진 자료를 분석하여 표적신호를 특징지우고, HL 모델의 기본 가정의 타당성을 검토한다. 수조실험결과는 산란신호가 시간영역에서 신장되고, 도플러효과가 나타나며, 표적의 내부 구조형상이 표적산한신호에 직접반사 이상의 영향을 미침을 보여준다. 이는 표적산란 신호의 합성에 있어서 사용되는 충격응답 또는 그린 함수(Green's function)가 단순한 델타함수가 아닌 필터역할을 하도록 시뮬레이션해야 함을 보여 준다. Simulation of the target-scattered echo requires the understanding of scattering mechanism at the highlight points. In this paper, the basic assumption of Highlight Model is reviewed through the analyzed data obtained in the acoustic water tank experiment. The analysis shows that the scattering mechanism involves pulse elongation and frequency shift as elements of target-scattered echo, and that the internal structures affect the temporal response of the target-scattered echo significantly. The band-limited impulse response or Green's function due to the diffraction from highlight points of internal structures is not mere delta function, but acts like a filter, which causes frequency shift and is elongated in time.