Sciweavers

3514 search results - page 254 / 703
» On Moving Object Queries
Sort
View
GIS
2010
ACM
15 years 5 months ago
Verifying spatial queries using Voronoi neighbors
With the popularity of location-based services and the abundant usage of smart phones and GPS enabled devices, the necessity of outsourcing spatial data has grown rapidly over the...
Ling Hu, Wei-Shinn Ku, Spiridon Bakiras, Cyrus Sha...
ESWS
2010
Springer
15 years 11 months ago
Improving the Performance of Semantic Web Applications with SPARQL Query Caching
The performance of triple stores is one of the major obstacles for the deployment of semantic technologies in many usage scenarios. In particular, Semantic Web applications, which ...
Michael Martin, Jörg Unbehauen, Sören Au...
SIGMOD
1996
ACM
120views Database» more  SIGMOD 1996»
15 years 10 months ago
Query Execution Techniques for Caching Expensive Methods
Object-Relational and Object-Oriented DBMSs allow users to invoke time-consuming ("expensive") methods in their queries. When queries containing these expensive methods a...
Joseph M. Hellerstein, Jeffrey F. Naughton
WWW
2006
ACM
16 years 7 months ago
Semantic link based top-K join queries in P2P networks
An important issue arising from Peer-to-Peer applications is how to accurately and efficiently retrieve a set of K best matching data objects from different sources while minimizi...
Jie Liu, Liang Feng, Chao He
DEXAW
2000
IEEE
92views Database» more  DEXAW 2000»
15 years 11 months ago
Consistent Queries over Cardinal Directions across Different Levels of Detail
Current models for cardinal directions, such as north and northeast, are either point-based or region-based, but no models exist that apply equally, independent of the geometric d...
Roop K. Goyal, Max J. Egenhofer