Results 21 to 30 of about 200,284 (141)

Query-guided End-to-End Person Search

, 2019
Person search has recently gained attention as the novel task of finding a person, provided as a cropped sample, from a gallery of non-cropped images, whereby several other people are also visible. We believe that i.
Amin, Sikandar, Galasso, Fabio, Munjal, Bharti, Tombari, Federico   +3 more
core   +1 more source

An extension of SPARQL for expressing qualitative preferences

, 2017
In this paper we present SPREFQL, an extension of the SPARQL language that allows appending a PREFER clause that expresses "soft" preferences over the query results obtained by the main body of the query.
C Domshlak, ED Valle, EGJ Coffman, J Cheng, J Chomicki, J Pérez, J Rosati, JP Delgrande, K Stefanidis, L Polo, S Magliacane, T Berners-Lee, W Siberski   +12 more
core   +1 more source

Towards a query language for annotation graphs [PDF]

, 2000
The multidimensional, heterogeneous, and temporal nature of speech databases raises interesting challenges for representation and query. Recently, annotation graphs have been proposed as a general-purpose representational framework for speech databases ...
Bird, Steven, Buneman, Peter, Tan, Wang-Chiew   +2 more
core   +5 more sources

The SPARQL Query Graph Model for Query Optimization [PDF]

, 2007
The Semantic Web community has proposed several query languages for RDF before the World Wide Web Consortium started to standardize SPARQL. Due to the declarative nature of the query language, a query engine should be responsible to choose an efficient evaluation strategy.
Olaf Hartig, Ralf Heese
openaire   +1 more source

Relational Approach to Logical Query Optimization of XPath [PDF]

, 2004
To be able to handle the ever growing volumes of XML documents, effective and efficient data management solutions are needed. Managing XML data in a relational DBMS has great potential.
Keulen, Maurice van
core   +1 more source

Towards Efficient Path Query on Social Network with Hybrid RDF Management

, 2014
The scalability and exibility of Resource Description Framework(RDF) model make it ideally suited for representing online social networks(OSN). One basic operation in OSN is to find chains of relations,such as k-Hop friends. Property path query in SPARQL
Chen, Wei, Gai, Lei, Qiu, Changhe, Wang, Tengjiao, Xu, Zhichao   +4 more
core   +1 more source

Open issues in semantic query optimization in relational DBMS [PDF]

, 2004
After two decades of research into Semantic Query Optimization (SQO) there is clear agreement as to the efficacy of SQO. However, although there are some experimental implementations there are still no commercial implementations.
Genet, Bryan Howard, Hinze, Annika
core   +1 more source

Constraint-based Query Distribution Framework for an Integrated Global Schema

, 2009
Distributed heterogeneous data sources need to be queried uniformly using global schema. Query on global schema is reformulated so that it can be executed on local data sources.
Iftikhar, Nadeem, Malik, Ahmad Kamran, Qadir, Muhammad Abdul, Usman, Muhammad   +3 more
core   +1 more source

SMOQE: A System for Providing Secure Access to XML [PDF]

, 2006
XML views have been widely used to enforce access control, support data integration, and speed up query answering. In many applications, e.g., XML security enforcement, it is prohibitively expensive to materialize and maintain a large number of views ...
Fan, Wenfei, Geerts, Floris, Jia, Xibei, Kementsietsidis, Anastasios   +3 more
core   +1 more source

Sampling-Based Query Re-Optimization

, 2016
Despite of decades of work, query optimizers still make mistakes on "difficult" queries because of bad cardinality estimates, often due to the interaction of multiple predicates and correlations in the data.
Bruno N., Graefe G., Ioannidis Y. E., Poosala V., Reddy N., Stillger M.   +5 more
core   +1 more source