邮箱 English

数学大讲堂

【Math Department Invited Talk】Operator Splitting in Action: Original Ideas, Derivations and Global Error Analysis

Abstract

Splitting methods have been used for solving a broad spectrum of scientific problems. They are designed for the numerical solutions to not only differential equations, but also statistical and optimization approximations. A splitting method decomposes an original problem to several subproblems, computes separately the solution of each of them, and then combines all sub-solutions to form an approximation of the solution to the original problem. A canonical example is splitting of diffusion and convection terms in a convection-diffusion partial differential equation. The splitting ideas simplify problems with multiple operators in natural ways. In all cases, the computational advantage is that it is faster to compute the solution of the split components separately, than to compute the solution directly when they are treated together. However, this comes at the cost of an error introduced by the splitting, so strategies must be devised for controlling the error. This talk studies splitting methods via operator computations. It also surveys recent developments in several areas. An interesting investigation is given in global error analysis of popular exponential splitting formulations. One recent development, adaptive splitting, deserves and receives a special mention in this talk: it is a new splitting method to collaborate with possible deep machine learning strategies.


Biography

Dr. Sheng received his BS and MS in Mathematics from Nanjing   University in 1982, 1985,respectively. He then obtained a Ph.D. degree from the University of Cambridge under the supervision of Professor Arieh Iserles. After his postdoctoral research with Professor Frank T. Smith,   FRS, in University College London, he joined National University of Singapore in 1990. Since then, Dr. Sheng was on faculty of several major   universities till his joining Baylor University, which is one of known  research institutions and the second biggest private university in the United States. He has been associated with the Mathematics Department andCenter for Astrophysics, Space Physics and Engineering Research (CASPER). See moredetails from Dr. Sheng's website https://sites.baylor.edu/qin_sheng/ .

Prof. Sheng has been interested in adaptive and splitting computations for solving linear and nonlinear partial differential equations. He is also known for the Sheng-Suzuki theoremin numerical analysis. He has published over 110 refereed articles as well as several joint research monographs. He has been an Editor-in-Chief of the SCI journal, International Journal of Computer Mathematics by Taylor and Francis Group since 2010. He gives invited presentations,including keynote lectures, in international conferences each year. Dr. Sheng's projects have beensupported by several research agencies. He currently advises 2 doctoral students and 2postdoctoral research fellows. He also has several academic   visitors from overseas institutions.