基于自顶向下的投影挖掘策略,提出一种无需多遍扫描数据库的 Web 访问模式算法 TAM-WAP.其特点是用当前所挖掘数据的特征去驱动一个预测算法,根据预测结果,有选择性地生成中间数据.对多种实际数据和模拟数据的实验表明,本文算法优于传...基于自顶向下的投影挖掘策略,提出一种无需多遍扫描数据库的 Web 访问模式算法 TAM-WAP.其特点是用当前所挖掘数据的特征去驱动一个预测算法,根据预测结果,有选择性地生成中间数据.对多种实际数据和模拟数据的实验表明,本文算法优于传统算法.展开更多
We present the first efficient sound and complete algorithm （i.e., AOMSSQ） for optimizing multiple subspace skyline queries simultaneously in this paper. We first identify three performance problems of the na/ve app...We present the first efficient sound and complete algorithm （i.e., AOMSSQ） for optimizing multiple subspace skyline queries simultaneously in this paper. We first identify three performance problems of the na/ve approach （i.e., SUBSKY） which can be used in processing arbitrary single-subspace skyline query. Then we propose a cell-dominance computation algorithm （i.e., CDCA） to efficiently overcome the drawbacks of SUBSKY. Specially, a novel pruning technique is used in CDCA to dramatically decrease the query time. Finally, based on the CDCA algorithm and the share mechanism between subspaces, we present and discuss the AOMSSQ algorithm and prove it sound and complete. We also present detailed theoretical analyses and extensive experiments that demonstrate our algorithms are both efficient and effective.展开更多
基金This work is supported by the NSF of USA under Grant No.IIS-0308001the National Natural Science Foundation of China under Grant No.60303008the National Grand Fundamental Research 973 Program of China under Grant No.2005CB321905.
文摘We present the first efficient sound and complete algorithm （i.e., AOMSSQ） for optimizing multiple subspace skyline queries simultaneously in this paper. We first identify three performance problems of the na/ve approach （i.e., SUBSKY） which can be used in processing arbitrary single-subspace skyline query. Then we propose a cell-dominance computation algorithm （i.e., CDCA） to efficiently overcome the drawbacks of SUBSKY. Specially, a novel pruning technique is used in CDCA to dramatically decrease the query time. Finally, based on the CDCA algorithm and the share mechanism between subspaces, we present and discuss the AOMSSQ algorithm and prove it sound and complete. We also present detailed theoretical analyses and extensive experiments that demonstrate our algorithms are both efficient and effective.
