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Adaptive Clutter Prewhitening Filter와 Doppler Filter Bank를 이용한 레이다 Clutter 제거 알고리듬의 성능에 관한 연구
김용호,이황수,은종관,이원길,Kim, Yong-Ho,Lee, Hwang-Soo,Un, Chong-Kwan,Lee, Won-Kil 대한전자공학회 1989 전자공학회논문지 Vol. No.
일반적으로 레이다 표적은 클러터 환경에 있으며 클러터 제거가 요구된다. 클러터는 지표, 기상 조건의 변화로 부터 발생되는 원하지 않는 레이다 반사파로 클러터의 통계적 특성은 시간, 거리 그리고 방향에 따라 변화함으로 효과적인 클러터 제거를 위하여 적응 신호 처리가 필요하다. 본 논문에서는 clutter whitening filter와 doppler filter bank를 이용한 클러터 제거 알고리듬을 제안하였으며 그 성능을 종래의 비적응 클러터 제거 알고리듬의 성능과 비교하였다. Clutter whitening filter 알고리듬 Burg가 제안한 최대 엔트로피 방법을 이용하였다. In many situations, radar targets are embedded in a clutter environment and clutter rejection is required. The clutter is unwanted radar echoes and may arise owing to reflections from ground and weather disturbances and statistical properties of the clutter vary with range and azimuth as well as time. That is, adaptive signal processing is required. In this paper, a clutter suppression algorithm based on the clutter whitening filter (WF) and doppler filter bank(DFB) is described which provides improved performance compared with conventional nonadaptive clutter suppression algorithm that is the cascaded moving target indicator (MTI) and (DFB). The clutter whitening filter algorithm is based on the Burg's maximum entropy method.
4-carbamidopyridinium cyclopentadienylide의 Solvatochromism에 대한 이론적 연구
김용호 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-
Solvatochromic shift of UV/VIS absorption wavelength in various solvents has been calculated for 4-carbamidopyridinium cyclopentadienylide (4-CPCP). Kirkwood-Onsager reaction field theory has been used to calculate the solvent effect. Since the Onsager factor g varies with dielectric constant in a specific fashion (non-linear), the calculated solvation energies also vary in the similar way. The calculated solvatochromic shift of the wavelength by INDO/S method show very similar pattern in terms of dielectric constant as Onsager factor g. However the plot of experimental solvatochromic shift vs. dielectric constant is linear. The discrepancy between experiment and theory can be corrected by using the different structure depending on the dielectric medium. For the solvent with low dielectric constant, the gas phase structure was used, and for the solvent with high dielectric constant, the structure calculated under water environment using ab initio SCRF method was used to calculate the solvatochromic shift. This approach shows better agreement with experiment.