博碩士論文 102522011 詳細資訊




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姓名 韓伯維(Po-wei Harn)  查詢紙本館藏   畢業系所 資訊工程學系
論文名稱
(An Iterative Approach to Multi-Criteria Optimal Location Query)
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摘要(中) 空間數據查詢像是最近鄰居與最佳位置查詢在文獻當中已被廣泛研究。在這篇論文中,我們提出一個多標準最佳位置查詢的迭代方法,這個迭代方法能應用在最佳位置選擇的更新問題。在提供關於更新問題的正式定義之後,我們提出一個增量更新的方法。這個方法以Minimum Overlapped Voronoi Diagram (MOVD) 新增刪除物件為基礎。除此之外,我們以數學來分析增量更新方法的複雜度。在效率評估上,我們的演算法是透過大量實驗數據來衡量。由結論可知,我們提出的演算法與最先進的解決方法相較之下,在點集合數量與物件種類少的時候,我們的演算法發揮較好執行效率。
摘要(英) Spatial queries such as nearest neighbor and optimal location queries have been extensively studied in the literature. In this thesis, we present an iterative approach to Multi-Criteria Optimal Location Queries which can be applied on the updating problem of the optimal location selection. After providing a formal definition of the updating problem, we propose an incremental updating approach based on insertion and deletion of an object to the Minimum Overlapped Voronoi Diagram (MOVD). In addition, we analyze the the complexity of our solution for the updating problem. The performance of our algorithm is evaluated through extensive experiments. The results show that our algorithm runs efficiently compared with the state-of-the-art solution when the size of the point sets and the number of types are small.
關鍵字(中) ★ 多標準最佳位置查詢
★ 最佳位置選擇的更新問題
★ 多標準最佳位置查詢的迭代方法
關鍵字(英) ★ Multi-Criteria Optimal Location Query
★ Voronoi Diagram
★ Overlapped Voronoi Diagram
★ Minimum Overlapped Voronoi Diagram
★ Incremental Algorithm of Voronoi Diagram
★ Multi-criteria Optimal Location Query Updating Problem
★ MOVD Incremental Updating Approach
★ Incremental Updating Framework
★ Insertion Algorithm
★ Deletion Algorithm
★ Framework of the MOVD-based Solution
★ Fermat-Weber Point
論文目次 1 Introduction 1
2 Related Work 4
2.1 Optimal Location Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Skyline Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Preliminaries 7
3.1 Voronoi Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.1 Ordinary Voronoi Diagram . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.2 Weighted Voronoi Diagram . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Incremental Algorithm of Voronoi Diagram . . . . . . . . . . . . . . . . . . 9
3.3 Fermat-Weber Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Problem De nition 11
4.1 Weighted Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.1 Weighted Distance of Two Points . . . . . . . . . . . . . . . . . . . 12
4.1.2 Weighted Distance from a Query Point to an Object Group . . . . 13
4.1.3 Minimum Weighted Distance from a Query Point to Object Groups 13
4.1.4 Multi-criteria Optimal Location Queries (MOLQ) . . . . . . . . . . 13
4.2 Update of Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 Adding an Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.2 Deleting an Object . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.3 Changing the Weight of an Object . . . . . . . . . . . . . . . . . . 15
4.2.4 Multi-criteria Optimal Location Query Updating Problem . . . . . 15
4.3 Overlapped Voronoi Diagram and Minimum Overlapped Voronoi Diagram 15
iii
4.3.1 Overlapped Voronoi Diagram (OVD) . . . . . . . . . . . . . . . . . 15
4.3.2 Minimum Overlapped Voronoi Diagram (MOVD) . . . . . . . . . . 16
5 Incremental Updating Approach 17
5.1 Framework of the MOVD-based Solution . . . . . . . . . . . . . . . . . . . 17
5.2 A Method to the Multi-criteria Updating Problem . . . . . . . . . . . . . . 18
5.3 MOVD Incremental Updating Approach . . . . . . . . . . . . . . . . . . . 19
5.3.1 Incremental Updating Framework . . . . . . . . . . . . . . . . . . . 19
5.3.2 Insertion Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3.3 Deletion Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6 Performance Evaluation 29
6.1 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2.1 Simulation Con guration . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2.2 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 Conclusions 42
Reference 43
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指導教授 孫敏德(Min-Te Sun) 審核日期 2015-8-6
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