报告题目： A direct method for inverse acoustic scattering in the time domain
报 告 人：郭玉坤 副教授 哈尔滨工业大学
报告时间：2021年9月3日 10:00-11:00
报告地点：数学楼一楼第二报告厅
校内联系人：董和平 dhp@jlu.edu.cn
报告摘要：This talk is concerned with the inverse scattering problems of imaging unknown/inaccessible scatterers by transient acoustic near-field measurements. Based on the analysis of the migration method, we propose efficient and effective sampling schemes for imaging small and extended scatterers from knowledge of time-dependent scattered data due to incident impulsive point sources. Though the inverse scattering problems are known to be nonlinear and ill-posed, the proposed imaging algorithms are totally “direct” involving only integral calculations on the measurement surface. Numerical results will be shown to demonstrate the effectiveness and robustness of our methods.
报告人简介：郭玉坤，哈尔滨工业大学数学学院副教授，博士生导师。毕业于吉林大学数学研究所计算数学专业，获理学博士学位。研究领域为数学物理反问题，主要方向为波动方程反散射问题的数值分析与计算。已在“Inverse Problems”、“Journal of Differential Equations”和“Journal of Computational Physics”等期刊发表学术论文三十余篇。主持国家自然科学基金面上项目、青年基金和数学天元基金项目各1项，参与国家自然科学基金重大研究计划项目1项，面上项目3项。
