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In this paper, we propose the concept of Voronoi-based potentially visible set, called V\text underscore PVS, to facilitate the visibility computation. Given a polygon $P$, we first compute the Voronoi diagram of $P$, i.e., $\text{VD}(P)$. Then we refine $\text{VD}(P)$ into $\text{VD}(P')$, so that $\text{VD}(P')$ only contains triangular or quadrangular cells. For each Voronoi edge, a V\text underscore...
Efficient and timely response during accidents has received increased attention from practitioners and researchers. The sitting of emergency service facilities plays a crucial role in determining the efficiency of safety protection and emergency response. This article presents a fuzzy location-allocation model for large-scale emergencies. The previous efforts in this area have concentrated on enhancing...
Apriori algorithm is a classical mining algorithm uses the association rules. After analyzing the Apriori algorithm, this algorithm is inefficient due to it scans the database many times. Based on the strategy of accessing to database once, a new improved algorithm founded on the Apriori is put forward in this paper. Experiments show that it can significantly improve computation efficiency, i e reduce...
To deal with distribution network reconfiguration, a hierarchical structure poly-particle swarm optimization (HSPPSO) approach using the hierarchical structure concept of control theory is presented. In the bottom layer, parallel optimization calculation is performed on poly-particle swarms. In the top layer, each particle swam in the bottom layer is treated as a particle. The best position found...
A hierarchical structure poly-particle swarm optimization (HSPPSO) approach using the hierarchical structure concept of control theory is presented. In the bottom layer, parallel optimization calculation is performed on poly-particle swarms, which enlarges the particle searching domain. In the top layer, each particle swam in the bottom layer is treated as a particle of single particle swarm. The...
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