報告1題目:Digitization and Data Processing of Strong-Motion Earthquake Accelerograms
報告2題目:Wave Diffraction in Layered media
報告人：Vincent W Lee(教授,美國南加州大學)
報告時間：2017年4月26日（周三）下午2:30
報告地點：南京航空航天大學航空宇航學院18-529報告廳
報告内容簡介：
報告1: Digitization and Data Processing of Strong-Motion Earthquake Accelerograms
1) Current techniques of digitization and data processing of earthquake strong-motion accelerograms were first developed in the late 1960s and early 70s at California Institute of Technology in California (Trifunac and Lee, 1972). At that time, the only available technique was manual hand digitization.
2) With the development of image processing techniques in the 70s, an automatic digitization and data processing systemon a mini-computer was developed (Trifunac and Lee, 1979).
3) Following the development of personal computer (PC) and inexpensive scanner, the current digitization and data processing system can be performed on a PC using a digital scanner (Lee and Trifunac, 1984).
4) In the 21st century, digital accelerograms are now widely available, thus eliminating the digitization step. But the data processing part is still necessary. With advances in digital signal processing in electrical and computer engineering, the data processing part has been continuously evolving, improving the performance of the entire system.
5) Currently, all new recoding instruments are digital. However, it takes time to record a large numbers of strong-motion accelerograms, and as of now, most of the strong-motion data available has been recorded in analog form.
報告2: Wave Diffraction in Layered media
1) Synthetic Translational Motions of Surface and Body Waves in Elastic layered Media Over Half-apace
i) Theory
ii) Numerical Implementation
2) Scattering and Diffraction of Earthquake Motions in Irregular Elastic Layers, I: Love and SH waves
i) The Scattered (out-of-plane) Waves
ii) The out-of-plane Boundary Conditions at each layered interface
iii) The weighted residues (moment) method
3) Scattering and Diffraction of Earthquake Motions in Irregular Elastic Layers, II: Rayleigh and Body P and SV waves
i) The Scattered (in-plane) Longitudinal(P) and Shear (SV) Waves
ii) The in-plane Boundary Conditions at each layered interface
iii) The (same) weighted residues (moment) method
報告人簡介：
Vincent W Lee 教授，畢業于美國加州理工大學(California Institute of Technology)，目前是美國南加州大學(University of Southern California)的資深教授。主要研究方向為：局部場地地震波散射和地震動數據處理。Lee教授上世紀70年代就緻力于局部場地地震反應研究，在場地地震反應解析方法方面有着突出的貢獻，在國際上有很高的影響力。Lee教授是“大圓弧假定方法”的提出者，是國際上第一個采用波函數展開法結合大圓弧假定給出凹陷地形和沉積谷地對P和SV波散射解析解的學者,其提出的研究方法被國内外衆多學者采用。Lee教授在《ASCE Journal of Engineering Mechanics》、《Earthquake Engineering and Structural Dynamic》和《Soil Dynamic and Earthquake Engineering》等著名國際期刊上發表研究論文100餘篇。
