报告人：郭玉坤（哈尔滨工业大学数学系）

时间：2017.06.21 10：00 — 10：45

地点：理科楼LD201

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. Theoretical justifications will be presented and numerical results will be shown to demonstrate the effectiveness and robustness of our methods.
This is a joint work with Dietmar Hömberg, Guanghui Hu, Jingzhi Li and Hongyu Liu.

报告人简介：郭玉坤，男，1981年出生，哈尔滨工业大学数学系副教授。郭玉坤博士于2010年毕业于吉林大学数学研究所计算数学专业，主要研究方向为波动方程的反源和反散射问题的快速数值算法，已发表SCI检索学术论文十余篇，相关研究结果已发表在“Inverse Problems”，“Advances in Computational Mathematics”, “Journal of Computational Physics”等学术期刊。郭玉坤博士主持完成国家自然科学基金数学天元基金项目一项，参与国家自然科学基金重大研究计划项目一项，目前主持国家自然科学基金青年基金项目一项，参与面上项目两项。郭玉坤博士曾先后应邀访问美国特拉华大学，德国威尔斯特拉斯应用数学研究所，香港浸会大学和南方科技大学等单位，进行科研合作。

学院联系人：曾芳