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As a practical and efficient technique to access XML data, keyword query approaches should address two main problems: enable users to express their query intentions accurately and provide matching algorithms to realize users' query intentions faithfully. Most of the existing researches concentrate on the second problem and the first one is always neglected. In this paper, we propose a novel XML keyword...
R-tree is widely used in spatial database as a spatial access method. The node-split algorithm is the key sub-algorithm to generate R-tree. In traditional methods, the one-to-two split mode is applied. However, this leads to uneven node-shape. A brand-new node-split method is put forward. In this method, the 2-to-3 split mode is utilized based on spatial clustering principle, which can guarantee more...
The R*-tree, as a state-of-the-art spatial index, has already been applied in many fields. But in high-dimensional space its performance is not better than sequential scan algorithm. To solve time-series retrieval problem, we introduce a new index structure - Hierarchical Index Tree. Each time-series of database is divided into several segments with same length, each segment of which corresponds to...
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