报告1题目:Digitization and Data Processing of Strong-Motion Earthquake Accelerograms
报告2题目:Wave Diffraction in Layered media
报告人：Vincent W Lee(教授,美国南加州大学)
报告时间：2017年4月26日（周三）下午2:30
报告地点：南京航空航天大学航空宇航学院18-529报告厅
报告内容简介：
报告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.
报告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
报告人简介：
Vincent W Lee 教授，毕业于美国加州理工大学(California Institute of Technology)，目前是美国南加州大学(University of Southern California)的资深教授。主要研究方向为：局部场地地震波散射和地震动数据处理。Lee教授上世纪70年代就致力于局部场地地震反应研究，在场地地震反应解析方法方面有着突出的贡献，在国际上有很高的影响力。Lee教授是“大圆弧假定方法”的提出者，是国际上第一个采用波函数展开法结合大圆弧假定给出凹陷地形和沉积谷地对P和SV波散射解析解的学者,其提出的研究方法被国内外众多学者采用。Lee教授在《ASCE Journal of Engineering Mechanics》、《Earthquake Engineering and Structural Dynamic》和《Soil Dynamic and Earthquake Engineering》等著名国际期刊上发表研究论文100余篇。
