| 摘要: |
| 随着无线通信和定位技术的发展,移动对象的追踪已经变得越来越可行和必需.传统空间索引结构因无法适应大量的更新操作而不能应用于移动对象的存储与检索.针对具有层次化编制特征的移动对象集,首先给出了一种实现坐标-编制混合特征索引的C2OR-Tree方法.在C2OR-Tree的基础上,提出了称为"主动插入-延迟删除(AIDD)"技术的移动对象位置更新批处理算法.AIDD算法充分利用了C2OR-Tree在更新批处理时的局部重构特性,通过在新坐标下对象插入过程中结合更新区域标记过程的思想给出了C2OR-Tree更新批处理的高效实现.实验结果显示,采用AIDD技术的C2OR-Tree不仅具有高效的位置更新批处理性能,而且在多次更新后男,副教授,主要研究领域为人工智能,数据库技术.仍能保持令人满意的查询性能. |
| 关键词: R-树 移动对象 索引 更新批处理 |
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| 基金项目:Supported bythe National High-Tech Research and Development Plan of China under Grant No.2002AA131010(国家高技术研究发展计划(863));the National Key Laboratory Foundation of Chinaunder Grant No.51447060101KG0101(国防科技重点实验室基金) |
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| Towards the Hybrid Feature Indexing of Hierarchically Organized Mobile Objects |
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ZHANG Ju,XIAO Yu-Qin,JING Ning,CHEN Hong-Sheng
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| Abstract: |
| With the rapid advances of wireless communication and positioning techniques, tracking the positions of mobile objects is becoming increasingly feasible and necessary. Traditional spatial index structures are not suitable for indexing mobile objects because of numerous updating operations. A coordinates-organization hybrid-feature indexing structure called C2OR-Tree is firstly introduced in this paper to index the current positions of the hierarchically organized mobile objects. Based on C2OR-Tree, a notable activated-insertion and deferred-deletion (AIDD) algorithm is presented to deal with the bulk updates of the objects coordinates. In view of the local reconstruction characteristic of the C2OR-Tree, AIDD algorithm gives an efficient implemention of the bulk updates with the integration of the insert processing of the updated objects and the earmark processing of the updated regions. Experiment shows that C2OR-Tree can preserve its satisfying query response capability even after many times of AIDD operations. |
| Key words: R-Tree mobile object indexing bulk updating |
