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The Computed Tomography (CT) is a imaging method based on X-rays to obtain cross-sectional images from an object. It is a widely used method in several areas, such as medicine, archeology or material sciences. Tomographic reconstruction techniques, use the projections of images from multiple directions. There are several algorithms for this purpose but can be classified according to their reconstruction...
The identification of network motifs has important applications in numerous domains, such as pattern detection in biological networks and graph analysis in digital circuits. However, mining network motifs is computationally challenging, as it requires enumerating subgraphs from a real-life graph, and computing the frequency of each subgraph in a large number of random graphs. In particular, existing...
In various applications where the problem domain can be modeled into graphs, the shortest path computation in the graph is an indispensable challenge. In applications like online social networks and shortest route computation problems, the size of the graph is so large; the number of nodes have become close to hundreds of billions. Shortest path graph algorithms like SSSP (Single Source Shortest Path)...
ChaCha20 is an encryption cipher selected by Google to replace the now obsolete RC4 in the Chrome browser and Android devices. The current article discusses the performance implications of parallelizing ChaCha20 across multicore CPU and GPU. The serial implementation used to derive the parallel code is part of BoringSSL encryption library. We used OpenMP and OpenCL to accelerate the cipher and obtain...
In this paper, we would like to introduce a GPU accelerated solver for systems of linear equations with an infinite precision. The infinite precision means that the system can provide a precise solution without any rounding error. These errors usually come from limited precision of floating point values within their natural computer representation. In a simplified description, the system is using...
Scientific applications need to be moved among supercomputers, such as Tianhe-2 and TSUBAME 2.5. OpenACC provides a directive-based approach for a single source code base with function portability across different accelerators used in the supercomputers. However, the performance portability is not guaranteed by the OpenACC standard. Therefore, we propose a systematic optimization method, instead of...
HEVC (High Efficiency Video Coding) is the newest video compression standard. Compared with the previous standards, the Coding efficiency is greatly improved at the cost of much higher codec complexity. So, many people improve the HEVC algorithm from the hardware level and software level. For the IQ/IT (inverse quantization/inverse transform) part, HEVC just processes one TU block one by one. And...
Cloud detection and removal forms an important need for change detection studies. A small amount of cloud cover may misinterpret the crucial information in disaster management applications. Although several cloud detection techniques exist, there is a critical need to apply these techniques in real time and obtain the cloud free images quickly to support real time decisions.
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