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SPHLU: An Efficient Algorithm for Processing PRkNN Queries on Uncertain Data

机译:SPHLU:一种处理不确定数据的PRkNN查询的高效算法

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摘要

Query on uncertain data has received much attention in recent years, especially with the development of Location-based services (LBS). Little research is focused on reverse k nearest neighbor queries on uncertain data. We study the Probabilistic reverse k nearest neighbor (PRkNN) queries on uncertain data. It is succinctly shown that, PRkNN query retrieves all the points that have higher probabilities than a given threshold value to be the Reverse k-nearest neighbor (RkNN) of query data Q. The previous works on this topic mostly process with k > 1. Some algorithms allow the cases for k > 1, but the efficiency is inefficient especially for large k. We propose an efficient pruning algorithm Spatial pruning heuristic with louer and upper bound (SPHLU) for solving the PRkNN queries for k > 1. The experimental results demonstrate that our algorithm is even more efficient than the existent algorithms especial for a large value of k.
机译:近年来,尤其是随着基于位置的服务(LBS)的发展,对不确定数据的查询受到了广泛关注。很少有研究集中在对不确定数据的反向k最近邻查询。我们研究了不确定数据上的概率反向k最近邻(PRkNN)查询。简明地表明,PRkNN查询将所有具有比给定阈值高的概率的点检索为查询数据Q的反向k最近邻(RkNN)。有关该主题的先前工作大多处理k> 1。某些算法允许k> 1的情况,但是效率低下,尤其是对于大k。我们提出了一种有效的修剪算法,用于解决k> 1的PRkNN查询,并具有较大的上下限空间修剪启发式(SPHLU)。实验结果表明,对于较大的k值,我们的算法比现有的算法更为有效。

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