Filters








25,403 Hits in 3.9 sec

Using AberOWL for fast and scalable reasoning over BioPortal ontologies

Luke Slater, Georgios V. Gkoutos, Paul N. Schofield, Robert Hoehndorf
2016 Journal of Biomedical Semantics  
Acknowledgements This paper is an extended version of a conference paper by the same name, presented at ICBO 2015.  ...  by the number of queries executed in parallel Fig. 3 3 Query times over the NCI Thesaurus Table 1 1 Summary of Ontologies used in our test Total © 2016 The Author(s).  ...  Figure 1 shows the query times for the ontologies based on the type of query, and Fig. 2 shows the query times based on different number of queries run in parallel.  ... 
doi:10.1186/s13326-016-0090-0 pmid:27502585 pmcid:PMC4976511 fatcat:nxvmvxi6evbo5dk3amtqmfvc2u

Scalable Queries Over Log Database Collections [chapter]

Minpeng Zhu, Khalid Mahmood, Tore Risch
2015 Lecture Notes in Computer Science  
FLOQ provides general and extensible mechanisms for efficient processing of queries over different kinds of distributed data sources.  ...  Scalable Queries over Log Database Collections. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1343. 51 pp.  ...  To process queries over geographically distributed log databases, I developed two new join strategies, parallel bind-join (PBJ) and parallel bulk-load join (PBLJ).  ... 
doi:10.1007/978-3-319-20424-6_17 fatcat:uu5rpgzxo5g2xidzlhrbcvgzbi

Ontology-Based Integration of Streaming and Static Relational Data with Optique

Evgeny Kharlamov, Christoforos Svingos, Dmitriy Zheleznyakov, Ian Horrocks, Yannis Ioannidis, Ralf Moeller, Sebastian Brandt, Ernesto Jimenez-Ruiz, Yannis Kotidis, Steffen Lamparter, Theofilos Mailis, Christian Neuenstadt (+2 others)
2016 Proceedings of the 2016 International Conference on Management of Data - SIGMOD '16  
A complex diagnostic task may require a collection of up to hundreds of queries over such data.  ...  In a nutshell, OP-TIQUE allows complex diagnostic tasks to be expressed with just a few high-level semantic queries.  ...  While running the tests they will monitor the throughput and progress of parallel query execution processes.  ... 
doi:10.1145/2882903.2899385 dblp:conf/sigmod/KharlamovBJKLMN16 fatcat:r5hcgvmrurbe7a6rxjenrcn4xq

Massive parallelism for query answering in weakly integrated P2P systems

Z. Majkic
2004 Proceedings. 15th International Workshop on Database and Expert Systems Applications, 2004.  
We show that the algorithm supports the high parallelism in the process of query answering from different peers.  ...  A new set of requirements for query processing has emerged, as Internet and Web-based query systems have become more prevalent.  ...  x ) of £ ¤ can be parallelized. -Incremental query answering with parallelism: This process combines the incremental answering with the parallelism.  ... 
doi:10.1109/dexa.2004.1333528 dblp:conf/dexaw/Majkic04 fatcat:eam5kdk6u5crrm7i6sdywmub34

A Knowledge Integration Framework for Information Visualization [chapter]

Jinwook Seo, Ben Shneiderman
2005 Lecture Notes in Computer Science  
Our examples present hierarchical clustering of gene expression data, coordinated with a parallel coordinates view and with the gene annotation and gene ontology.  ...  The novel parallel coordinates view [6] powered by a direct-manipulation search, offers strong advantages, but requires some training for most users.  ...  In the parallel coordinates view, users can submit a new query over the current query result.  ... 
doi:10.1007/978-3-540-31842-2_21 fatcat:57qn7n4pyna3xhxqvpu6zugz2u

Towards a Mediator Based on OWL and SPARQL [chapter]

Konstantinos Makris, Nikos Bikakis, Nektarios Gioldasis, Chrisa Tsinaraki, Stavros Christodoulakis
2009 Lecture Notes in Computer Science  
The Mediator supports mappings between the OWL Ontology of the Mediator and the other ontologies in the federated sites.  ...  SPARQL queries submitted to the Mediator are decomposed and reformulated to SPARQL queries to the federated sites. The evaluated results return to the Mediator.  ...  We assume that an initial SPARQL query is posed over the source ontology presented in Fig. 1 and is reformulated to a semantically equivalent query in order to be posed over the target ontology of Fig  ... 
doi:10.1007/978-3-642-04754-1_34 fatcat:7juggrh74zc5tbpaegceabqxia

LiteMat: a scalable, cost-efficient inference encoding scheme for large RDF graphs [article]

Olivier Curé, Hubert Naacke, Tendry Randriamalala, Bernd Amann
2015 arXiv   pre-print
Query processing in the presence of inferences is one them.  ...  We will show how this encoding can be computed by a scalable parallel algorithm and directly be implemented over the Apache Spark framework.  ...  From a query processing point of view, to achieve completeness of result sets, RDF query processors have to integrate information that is inferred using these ontologies.  ... 
arXiv:1510.03409v1 fatcat:yaz64mu6y5fezi56uhxqoromay

Scalable Reduction of Large Datasets to Interesting Subsets

Gregory Todd Williams, Jesse Weaver, Medha Atre, James Hendler
2010 Social Science Research Network  
We present a system that combines the computational power of large clusters for enabling large-scale reasoning and data access with an efficient data structure for storing and querying the accessed data  ...  Traditional approaches to storing, querying, and reasoning fall short when faced with web-scale data.  ...  this work was provided in part by a seedling grant from DARPA's Transformational Convergence Technology Office and gifts from Lockheed Martin Advanced Technology Laboratories and Fujitsu Laboratories of  ... 
doi:10.2139/ssrn.3199489 fatcat:josf5g6fozhxlkcwq7md36n5qe

A semantic approach to polystores

E. Kharlamov, T. Mailis, K. Bereta, D. Bilidas, S. Brandt, E. Jimenez-Ruiz, S. Lamparter, C. Neuenstadt, O. Ozcep, A. Soylu, C. Svingos, G. Xiao (+8 others)
2016 2016 IEEE International Conference on Big Data (Big Data)  
In the database community Polystores is an emerging and promising approach for data federation that aims at designing a unified querying layer over multiple data models.  ...  In the Semantic Web community a similar in spirit approach of Ontology-Based Data Access (OBDA) has been recently proposed, attracted a lot of attention, and proved its success in several industrial scenarios  ...  can be accessed by posing queries over the ontology, i.e., ontological queries.  ... 
doi:10.1109/bigdata.2016.7840898 dblp:conf/bigdataconf/KharlamovMBBBJL16 fatcat:qoo6qitn4nf6jiqwltr7ehqj3a

Scalable reduction of large datasets to interesting subsets

Gregory Todd Williams, Jesse Weaver, Medha Atre, James A. Hendler
2010 Journal of Web Semantics  
We present a system that combines the computational power of large clusters for enabling large-scale reasoning and data access with an efficient data structure for storing and querying the accessed data  ...  Traditional approaches to storing, querying, and reasoning fall short when faced with web-scale data.  ...  this work was provided in part by a seedling grant from DARPA's Transformational Convergence Technology Office and gifts from Lockheed Martin Advanced Technology Laboratories and Fujitsu Laboratories of  ... 
doi:10.1016/j.websem.2010.08.002 fatcat:33njao7cjfdrlgjk6jnm4wip7y

Query processing in a three-level ontology-based data integration system

João C. Pinheiro, Vânia M. P. Vidal, José A. F. Macêdo, Eveline R. Sacramento, Marco A. Casanova, Fábio A. M. Porto
2010 Proceedings of the 12th International Conference on Information Integration and Web-based Applications & Services - iiWAS '10  
First, the query is decomposed, using the mediated mappings, into a set of elementary sub-queries expressed in terms of the application ontologies.  ...  This paper focus on a method for query processing that addresses the problem of efficient query answering.  ...  These experiments will provide empirical evidences of the scalability of our query answering approach using sets of very large ontologies.  ... 
doi:10.1145/1967486.1967532 dblp:conf/iiwas/PinheiroVMSCP10 fatcat:yoddiuorvrgatbkzn4otjq2sju

Query Processing in a Mediator Based Framework for Linked Data Integration

Vânia M. P. Vidal, José A. F. de Macêdo, João C. Pinheiro, Marco A. Casanova, Fábio Porto
2011 International Journal of Business Data Communications and Networking  
First, the query is decomposed, using the mediated mappings, into a set of elementary sub-queries expressed in terms of the application ontologies.  ...  The main contribution of the paper is an algorithm for reformulating a user query into sub-queries over the data sources.  ...  The potential cost reduction obtained by parallelizing sub-query processing.  ... 
doi:10.4018/jbdcn.2011040103 fatcat:mxxb6w3xpjg2xhlllaonuur2ly

NGS: a framework for multi-domain query answering

D. Braga, D. Calvanese, A. Campi, S. Ceri, F. Daniel, D. Martinenghi, P. Merialdo, R. Torlone
2008 2008 IEEE 24th International Conference on Data Engineering Workshop  
services, (b) covers query formulation aspects over the global ontology, and query rewriting in terms of the actual services, and (c) offers several optimization opportunities leveraging the characteristics  ...  In particular, NGS (a) integrates different kinds of services (search engines, web services, and wrapped web pages) into a global ontology, i.e., a unified view of the concepts supported by the available  ...  ACKNOWLEDGEMENTS All authors acknowledge support from Italian PRIN project "New technologies and tools for the integration of Web search services".  ... 
doi:10.1109/icdew.2008.4498328 dblp:conf/icde/BragaCCCDMMT08 fatcat:ge4qk6gqwzbvpowsbgztq5ykuu

A survey of large-scale reasoning on the Web of data

Grigoris Antoniou, Sotiris Batsakis, Raghava Mutharaju, Jeff Z. Pan, Guilin Qi, Ilias Tachmazidis, Jacopo Urbani, Zhangquan Zhou
2018 Knowledge engineering review (Print)  
In order to provide a first complete overview of the field, this paper reports a systematic review of such scalable reasoning approaches over various ontological languages, reporting details about the  ...  These systems differ significantly; for instance in terms of reasoning expressivity, computational properties such as completeness, or reasoning objectives.  ...  "III: Small: TROn -Tractable Reasoning with Ontologies."  ... 
doi:10.1017/s0269888918000255 fatcat:bergc5uphbceznigppektgvzrm

Ontologies and text retrieval

JAMES MAYFIELD
2002 Knowledge engineering review (Print)  
over such processing.  ...  the existence of large amounts of parallel ontological/textual data.  ... 
doi:10.1017/s026988890200036x fatcat:houfurmrunfotkk66o7uh5micm
« Previous Showing results 1 — 15 out of 25,403 results