| 一种应用于Deep Web数据集成系统中的查询松弛策略 |
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| 引用本文： | 申德荣,马也,聂铁铮,寇月,于戈.一种应用于Deep Web数据集成系统中的查询松弛策略[J].计算机研究与发展,2010,47(1). |
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| 作者姓名： | 申德荣 马也 聂铁铮 寇月 于戈 |
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| 作者单位： | 东北大学信息科学与工程学院,沈阳,110004 |
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| 基金项目： | 国家自然科学基金项目(60673139,60973021);;国家“八六三”高技术研究发展计划基金项目(2008AA01Z146) |
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| 摘 要： | 针对Deep Web环境中存在的失败查询,提出了一种有效的查询松弛策略.所有Deep Web资源按查询接口属性分组,组成全局数据源关系图(DRG);针对特定查询将DRG转换为对应该查询请求的数据源关系图;利用该DRG,按照特定的规则进行查询松弛和执行处理.针对查询松弛导致的部分结果可能与用户查询请求的相似度较低的问题,提出先通过Skyline方法对结果进行筛选,然后再根据各个结果实例与用户查询的相似度进行Top-k排序,最后将最接近用户要求的结果集返回给用户.通过实验验证了提出的查询松弛策略的有效性.
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| 关 键 词： | Deep Web 查询松弛 数据源关系图 Top-k Skyline |
A Query Relaxation Strategy Applied in a Deep Web Data Integration System |
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| Shen Derong,Ma Ye,Nie Tiezheng,Kou Yue,Yu Ge.A Query Relaxation Strategy Applied in a Deep Web Data Integration System[J].Journal of Computer Research and Development,2010,47(1). |
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| Authors: | Shen Derong Ma Ye Nie Tiezheng Kou Yue Yu Ge |
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| Affiliation: | School of Information Science & Engineering;Northeastern University;Shenyang 110004 |
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| Abstract: | In the process of query in Deep Web data integration system,it is hard to avoid the so-called failed query that brings unsatisfactory result. So it is more cooperative to modify the raw query to return non-empty result set than to notify the user that there is no result corresponding to the query at all. Inspired by the observations and analysis on deep Web,a query relaxation solution applied in a deep Web data integration system is proposed in this paper,in which,all the Deep Web sources are grouped based ... |
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| Keywords: | Deep Web query relaxation database relationship graph Top-k skyline |
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