We present the newly developed code, GAMER (GPU-accelerated Adaptive MEsh Refinement code), which has adopted a novel approach to improve the performance of adaptive mesh refinement (AMR) astrophysical simulations by a large factor with the use of the graphic processing unit (GPU). The AMR implementation is based on a hierarchy of grid patches with an oct-tree data structure. We adopt a three-d...

Coarse grid correction is a key ingredient in order to have scalable domain decomposition methods. In this work we construct the coarse grid space using the low frequency modes of the subdomain DtN maps, and apply the obtained two-level preconditioner (the additive Schwarz method together with the new coarse grid) to the extended or the original linear system arising from an overlapping domain ...

This paper presents a fully parallelized domain decomposition (DD) technique for efficient simulation of large-scale linear circuits such as power grids. Domain decompositions using non-overlapping and overlapping partitions are developed to conquer the numerical difficulties in simulation. Experimental results show that by the proposed parallel DD framework, existing linear circuit simulators ...

Polarimetric synthetic aperture radar (PolSAR) image classification has achieved great progress, but there still exist some obstacles. On the one hand, a large amount of PolSAR data is captured. Nevertheless, most them are not labeled with land cover categories, which cannot be fully utilized. other annotating images relies more on domain knowledge and manpower, makes pixel-level annotation har...

This paper presents a 3D reconstruction method for fast elevation determination on construction sites. The proposed is intended to automatically and accurately determine site elevations using drone-based, low–high orthoimage pairs. requires fewer images than other methods covering large target area of site. An up–forward–down path was designed capture approximately 2∶1-scale at different altitu...

We provide a maximum norm analysis of an overlapping Schwarz method on nonmatching grids for second-order elliptic obstacle problem. We consider a domain which is the union of two overlapping subdomains where each subdomain has its own independently generated grid. The grid points on the subdomain boundaries need not match the grid points from the other subdomain. Under a discrete maximum princ...

Abstract. This work presents a patch-based multi-atlas segmentation approach based on non-negative least squares regression. Our approach finds a weighted linear combination of local image patches that best models the target patch, jointly for all considered atlases. The local coe cients are optimised with the constraint of being positive or zero and serve as weights, of the underlying segmenta...