Reverse direction-based surrounder queries for mobile recommendations
Reverse direction-based surrounder queries for mobile recommendations
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DOI：
10.1007/s11280-016-0422-0
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
G. Xi;Y. Ishikawa;Yonghong Xie;A. Wulamu
中科院分区：
文献类型：
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作者：
G. Xi;Y. Ishikawa;Yonghong Xie;A. Wulamu
本文提出了一种新的空间查询方法，称为基于反向方向的代理查询(RDBS)，该查询将看到兴趣点(POI)的用户作为其基于方向的环绕(DBSS)之一来检索。根据用户，如果一个POI在方向上接近并且第一个POI比第二个POI离用户更远，则一个POI可以由第二个POI支配。如果两个POI相对于用户的夹角小于角度阈值𝜃，则它们在方向上接近。如果一个POI不能由另一个POI主导，则它是用户的DBS。我们还提出了一种称为竞争者关系数据库查询的扩展查询。与另一POI共享相同RDB的POI被定义为该POI的竞争对手。我们设计了算法来回答关系数据库的查询和竞争对手的查询。实验结果表明，该算法能够有效地回答查询问题。
This paper proposes a new spatial query called areverse direction-based surrounder(RDBS)query, which retrieves a user who is seeing a point of interest (POI) as one of their direction-based surrounders (DBSs). According to a user, one POI can be dominated by a second POI if the POIs are directionally close and the first POI is farther from the user than the second is. Two POIs are directionally close if their included angle with respect to the user is smaller than an angular threshold𝜃. If a POI cannot be dominated by another POI, it is a DBS of the user. We also propose an extended query calledcompetitor RDBS query. POIs that share the same RDBSs with another POI are defined as competitors of that POI. We design algorithms to answer the RDBS queries and competitor queries. The experimental results show that the proposed algorithms can answer the queries efficiently.