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Image segmentation is a fundamental problem in image processing and computer vision. Its goal is to separate an image into a collection of distinct regions, after which other high-level tasks can be performed. Nomalized cut (Ncut) algorithm is the most popular one in image segmentation algorithms. However, the number of segmentation regions needs to be specified by users or experts before the Ncut...
In Wireless Mesh Networks (WMNs), many applications are based on broadcast, such as the public security information, weather forecast and live show for users. Besides, broadcast is also a fundamental component of network protocols. Many broadcast approaches has been proposed like flooding and node-based CDS(N-CDS) scheme, but few have promising performance when used in multi-channel scenarios. In...
Lower upper (LU) factorization for sparse matrices is the most important computing step for circuit simulation problems. However, parallelizing LU factorization on the graphic processing units (GPUs) turns out to be a difficult problem due to intrinsic data dependence and irregular memory access, which diminish GPU computing power. In this paper, we propose a new sparse LU solver on GPUs for circuit...
Via analyzing characters of vast disaster news on the internet, a new topic detection algorithm based on Group Average Hierarchical Clustering (GAHC), which is suitable for the processing of big data on the network, is proposed in this paper. The core idea of GAHC is to divide big data into smaller groups, and then cluster groups hierarchically to generate final topics. During the process of clustering,...
For the drawbacks of application in general function optimization using Ant Colony Optimization (ACO), ant's move method and pheromone updating strategy is modified on ACO. And typical problems are used to demonstrate its validation. The results show that after modification, the convergence process is quicker and the approach is found to give accuracy. At the end of this paper, the parameters selection...
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