On the fractional-order asymptotical regularization of linear ill-posed problems

题目：On the fractional-order asymptotical regularization of linear ill-posed problems

时间：12月24日（周一）16:00-17:00

地点：工商管理楼200-9

报告人：Ye Zhang (Faculty of Mathematics, Chemnitz University of Technology, Germany)

Abstract: I will present a fractional-order variant of the asymptotical regularization method, called Fractional Asymptotical Regularization (FAR), for solving linear ill-posed operator equations in a Hilbert space setting. I will prove that under certain smoothness assumptions, FAR with fractional order in the range (1,2) yields an acceleration with respect to comparable order optimal regularization methods. In comparison with existing acceleration regularization methods, FAR is an accelerated method without saturation. A further acceleration of FAR is obtained in Hilbert scales. For numerical realization of FAR, a novel iterative regularization scheme is developed based on the generalized Adams method.