Efficient location based spatial keyword query processing

... propose efficient location- based spatial keyword query processing strategies in this thesis First, we address a novel query, named mCK (m Closest Keywords) The query accepts a set of query keywords and ... address efficient location- based spatial keyword query processing strategies First, we introduce a novel query, named mCK, to locate m closest keywords in a spati...

Ngày tải lên: 10/09/2015, 08:26

... on-line maps provide this service) and relate the address to Bob by accessing an on-line white pages service A broad discussion on the risks of revealing sensitive information in location- based services ... challenging task, and a primordial requirement for LBS privacy This thesis presents a framework for private queries in location- based services First, we study in dep...

Ngày tải lên: 12/09/2015, 08:19

... AmbientDB: relational query processing in a P2P network In Proceedings of the International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P), LNCS 2788, Springer Verlag ... Queries and Query Optimization in Schema-Based P2P- Systems In Proceedings of the International Workshop on Databases, Information Systems and Peer-to-Peer Computing (D...

Ngày tải lên: 19/02/2014, 12:20

... of PDMS Indexes (either local index or distributed index) are built to facilitate query processing A MetaStore is created to maintain the information of schema mapping, indexing and data distribution ... 2 Query Processing in Peer- to -Peer Based Data Management System Sai Wu School of Computing National University of Singapore Summary In last ten years, we have...

Ngày tải lên: 10/09/2015, 15:49

... Sheng Chang, Sun Jie, Wang Xiaoli, Wu Huayu, Wu Ji, Wu Jun, Wu Sai, Wu Wei, Yang Fei, Xiang Shili, Xu Liang, Xue Mingqiang, Ying Shanshan, Zhang Dongxiang, Zhang Jingbo, Zhang Meihui and Zhang Zhenjie ... novel query ranking model to quantify the confidence of a refined query (RQ) candidate, which can capture the morphological/semantical similarity between Q and RQ and the dependency of...

Ngày tải lên: 10/09/2015, 15:52

... 20 Human Motion Sequences 20 2.1.1 Feature extraction of human motion sequences 21 2.1.2 Matching human motion sequences 21 Distance Measures of Time ... the problems of efficient and effective query processing of complex spatio-temporal sequences Our solutions on subsequence matching and subsequence join techniques over human motion sequences can ......

Ngày tải lên: 14/09/2015, 14:05

... extra processing increase for cache miss, bottleneck occurring for single proxy cache, single point of failure for single proxy cache, and the reduction of hits to the original server For each ... presents an efficient updating method for the caches residing on the edge servers for maintaining cache coherence for multiple caches with data from a single source These caches...

Ngày tải lên: 16/09/2015, 17:12

... EnAcq, a novel energy- efficient location data acquisition scheme based on improved map matching that addresses two key challenges: inaccurate trajectory data and energy consumption To improve the ... corresponding GPS location points on Google Maps [2] Typically a tuple of location data consists of latitude, longitude, and timestamp information The temporal sequenc...

Ngày tải lên: 05/10/2015, 21:23

... an efficient identity-based key management for configurable hierarchical cloud computing environment The proposed scheme has better performance and fewer communication cost compared to other hierarchical ... Hongwei Li et al [5] proposed an identity-based hierarchical model for cloud computing (IBHMCC) In their scheme, the cloud computing environment is c...

Ngày tải lên: 31/07/2013, 09:44

... Dịch vụ công nghệ định vị Location Based Services Ứng dụng Dịch vụ khẩn cấp Hình 1.11 Ứng dụng dịch vụ khẩn cấp Một ứng dụng điển hình dịch vụ LBS khả định vị cá nhân họ vị trí xác (đó dịch vụ ... tài : Dịch vụ công nghệ định vị Location Based Services Ứng dụng Application Server : Một nhà cung cấp ứng dụng, cung cấp...

Ngày tải lên: 22/12/2013, 16:06

... on distributional similarity functions can be found in (Lillian Lee, 1999) 3.1 Distributional Similarity- Based Models for Query Spelling Correction Motivation Most of the previous work on spelling ... 62.6% Table Performance results for different models Table details the performance scores for the experiments, which shows that both of the two distributional simila...

Ngày tải lên: 17/03/2014, 04:20

... the schema of a particular representation provides a formal characterisation of locality Just as phrase structure is defined in terms of branches, we can define Chains as a sequence of links More ... structures are limited to some combination of binary (non-terminal) and unary (terminal) branches As discussed above, we can characterise the representational framework in ter...

Ngày tải lên: 18/03/2014, 02:20

... unimportant events, periodic and aperiodic events) Most of the existing approaches focus on detecting events from news stories In contrast, our dataset is much more noisy for event detection Not every Flickr ... which detects event semantics from Flickr tags [20] 5.1 Data set We crawled geo-tagged photos from the Flickr site using the available Flickr API Specifically, we...

Ngày tải lên: 23/03/2014, 13:20

... ii Parallel Query Processing Using Shared Memory Multiprocessors and Disk Arrays Wei Hong Computer Science Division Department of Electrical Engineering and Computer Science ... of database query processing is to nd the cheapest and fastest query plan 1.1.1 Conventional Query Processing Conventional query processing assumes a uniprocessor environment and...

Ngày tải lên: 28/04/2014, 13:32