Filters








275 Hits in 5.3 sec

Towards Scalable and Complete Query Explanation with OWL 2 EL Ontologies

Zhe Wang, Mahsa Chitsaz, Kewen Wang, Jianfeng Du
2015 Proceedings of the 24th ACM International on Conference on Information and Knowledge Management - CIKM '15  
To the best of our knowledge, no existing algorithm can efficiently and completely explain conjunctive queries (CQs) w.r.t. ELH ⊥ ontologies.  ...  Besides standard query answering, there is also a need for such systems to be coupled with explanation facilities, in particular to explain missing query answers (i.e. desired answers of a query which  ...  Jianfeng Du is partially supported by NSFC (61375056) and Guangdong Natural Science Foundation (S2013010012928).  ... 
doi:10.1145/2806416.2806547 dblp:conf/cikm/WangCWD15 fatcat:klcjrmqe5ndltgrdo32je7stea

Semantic Web Tools and Techniques for Knowledge Organization: An Overview

Thimmaiah Padmavathi, Madaiah Krishnamurthy
2017 Knowledge organization  
) and library automation.  ...  and a doctoral degree from Bharathiar University.  ...  Recently, the DL EL++ has been adopted as the logical underpinning of the OWL 2 EL profile of the new Web Ontology Language.  ... 
doi:10.5771/0943-7444-2017-4-273 fatcat:e6lv2dhwdfaypmqcbjcrnrufwe

Ontologies and Data Management: A Brief Survey

Thomas Schneider, Mantas Šimkus
2020 Künstliche Intelligenz  
In order to align and complete data, systems may rely on taxonomies and background knowledge that are provided in the form of an ontology.  ...  This survey gives an overview of research work on the use of ontologies for accessing incomplete and/or heterogeneous data.  ...  Šimkus was supported by the Vienna Business Agency, and the Austrian Science Fund (FWF) projects P30360 and P30873.  ... 
doi:10.1007/s13218-020-00686-3 pmid:32999532 pmcid:PMC7497697 fatcat:zeskjfjrpvcojjh6q3yjzhlyci

Heuristic Ranking in Tightly Coupled Probabilistic Description Logics [article]

Thomas Lukasiewicz, Maria Vanina Martinez, Giorgio Orsi, Gerardo I. Simari
2012 arXiv   pre-print
We present an anytime algorithm to answer ranking queries, and provide an upper bound on the error that it incurs, as well as a criterion to decide when results are guaranteed to be correct.  ...  In this paper, we present a probabilistic extension of the DL EL++ (which underlies the OWL2 EL profile) using Markov logic networks (MLNs) as probabilistic semantics.  ...  Section 2 describes the preliminaries on the DL EL ++ and MLNs.  ... 
arXiv:1210.4894v1 fatcat:jq2itwcfmvcnrizskdvgf5cvmm

Semantic web technologies in pervasive computing: A survey and research roadmap

Juan Ye, Stamatia Dasiopoulou, Graeme Stevenson, Georgios Meditskos, Efstratios Kontopoulos, Ioannis Kompatsiaris, Simon Dobson
2015 Pervasive and Mobile Computing  
OWL and OWL 2 OWL's design is strongly influenced by Description Logics (DL) [6] .  ...  systems can be deployed. 1 http://www.w3.org/TR/owl-features/ 2 in OWL one can e↵ectively model and reason over taxonomic knowledge.  ...  Three profiles, namely OWL 2 EL, OWL 2 QL and OWL 2 RL, trade portions of expressive power for reasoning e ciency, targeting di↵erent application scenarios.  ... 
doi:10.1016/j.pmcj.2014.12.009 fatcat:dehfs5inkbexpagk265co5tvxi

Ontologies and the Semantic Web [chapter]

2006 The Semantic Web  
To facilitate this process, RDF and OWL have been developed as standard formats for the sharing and integration of data and knowledge-the latter in the form of rich conceptual schemas called ontologies  ...  These languages, and the tools developed to support them, have rapidly become de facto standards for ontology development and deployment; they are increasingly used, not only in research labs, but in large  ...  Major research efforts have also been directed towards tackling some of the barriers to realising the semantic web mentioned in Section 1, and considerable progress has been made in areas such as ontology  ... 
doi:10.1002/0470028173.ch6 fatcat:pacolmphgvcxlh7g7nedbuz4zi

The Drosophila phenotype ontology

David Osumi-Sutherland, Steven J Marygold, Gillian H Millburn, Peter A McQuilton, Laura Ponting, Raymund Stefancsik, Kathleen Falls, Nicholas H Brown, Georgios V Gkoutos
2013 Journal of Biomedical Semantics  
The DPO is openly available under an open source license in both OBO and OWL formats.  ...  This work has significantly improved the accuracy and completeness of classification and made further development of the DPO more sustainable.  ...  Ontology and the Gene Ontology.)  ... 
doi:10.1186/2041-1480-4-30 pmid:24138933 pmcid:PMC3816596 fatcat:tu5xlh2svfh7voqrmxuk7cs3km

Inline Evaluation of Hybrid Knowledge Bases [chapter]

Guohui Xiao, Thomas Eiter
2011 Lecture Notes in Computer Science  
2 EL (Section 5.1) and conjunctive queries under DL-safeness condition over OWL 2 RL and OWL 2 EL (Section 5.2).  ...  EL family and OWL 2 EL According to W3C OWL 2 Profiles [Mot+08] , the OWL 2 EL profile is designed as a subset of OWL 2 that is particularly suitable for applications employing ontologies that define  ...  1 Meta-BI Ontology  ... 
doi:10.1007/978-3-642-23580-1_28 fatcat:xnzzbf2imngshokm36ni5vuzni

Applying Semantic Web Technologies for Diagnosing Road Traffic Congestions [chapter]

Freddy Lécué, Anika Schumann, Marco Luca Sbodio
2012 Lecture Notes in Computer Science  
Our prototype of semantic-aware diagnosis of road traffic congestions, experimented in Dublin Ireland, works efficiently with large, heterogeneous information sources and delivers value-added services  ...  to citizens and city managers in quasi real-time.  ...  This section 2 reviews (i) OWL 2 EL and its DL EL ++ as a formal knowledge representation language to define (ii) ontology stream and infer (iii) road congestions.  ... 
doi:10.1007/978-3-642-35173-0_8 fatcat:w7a4sogwh5gvflw4l4zpmwetve

Towards Unveiling the Ontology Key Features Altering Reasoner Performances [article]

Nourhène Alaya and Sadok Ben Yahia and Myriam Lamolle
2015 arXiv   pre-print
A variety of efficient reasoner with highly optimized algorithms have been developed to allow inference tasks on expressive ontology languages such as OWL(DL).  ...  Reasoning with ontologies is one of the core fields of research in Description Logics.  ...  However, this complexity could be tractable with less expressive fragments of OWL 2, mostly known as OWL profiles like OWL EL, OWL RL and OWL QL 2 .  ... 
arXiv:1509.08717v1 fatcat:2blv2wcflbetzop7vnurd7ijuy

Using provenance to debug changing ontologies

Simon Schenk, Renata Dividino, Steffen Staab
2011 Journal of Web Semantics  
Providing and reasoning with rich provenance data for expressive ontology languages, however, is a non-trivial task.  ...  large and expressive ontologies, such as used in biomedical portals.  ...  [22] extends the approach towards explanations and debugging of access rights.  ... 
doi:10.1016/j.websem.2011.06.009 fatcat:5dkguhyaevgaflzysufih2vyju

Uncertainty modeling process for semantic technology

Rommel N. Carvalho, Kathryn B. Laskey, Paulo C.G. Da Costa
2016 PeerJ Computer Science  
uncertainty with domain semantics.  ...  While the case study illustrates the development of a probabilistic ontology in the PR-OWL probabilistic ontology language, the methodology is applicable to any ontology formalism that properly integrates  ...  and validating the use case described.  ... 
doi:10.7717/peerj-cs.77 fatcat:nbpfounvwbgbjj4q2wqvkwgjji

Using SPARQL with RDFS and OWL Entailment [chapter]

Birte Glimm
2011 Lecture Notes in Computer Science  
SPARQL is a query language and protocol for data specified in the Resource Description Format (RDF). The basic evaluation mechanism for SPARQL queries is based on subgraph matching.  ...  The query criteria are given in the form of RDF triples possibly with variables in place of the subject, object, or predicate of a triple, called basic graph patterns.  ...  We generally abbreviate IRIs using prefixes rdf, rdfs, owl, xsd, and foaf to refer to the RDF, RDFS, OWL, XML Schema Datatypes, and FOAF namespaces, respectively.  ... 
doi:10.1007/978-3-642-23032-5_3 fatcat:hntq6ag5ijeafgquqkwhwncmsy

Ontology Based Data Access in Statoil

Evgeny Kharlamov, Dimitris Bilidas, Dag Hovland, Ernesto Jimenez-Ruiz, Davide Lanti, Hallstein Lie, Martin Rezk, Martin G. Skjjveland, Ahmet Soylu, Guohui Xiao, Dimitriy Zheleznyakov, Martin Giese (+4 others)
2017 Social Science Research Network  
of translating ontological queries into data queries and their execution over either a single DB of federated DBs; and a query formulation module to support query construction for engineers with a limited  ...  Our modules have been integrated in one OBDA system, deployed at Statoil, integrated with Statoil's infrastructure, and evaluated with Statoil's engineers and data.  ...  This work was partially funded by the EU project Optique (FP7-ICT-318338), the EPSRC projects MaSI 3 , DBOnto, ED 3 , the BIGMED project (IKT 259055), and the SIRIUS Centre for Scalable Data Access (Research  ... 
doi:10.2139/ssrn.3199136 fatcat:l23bxm5dgrcolfr4p43cs6efre

Ontology Based Data Access in Statoil

Evgeny Kharlamov, Dag Hovland, Martin G. Skjæveland, Dimitris Bilidas, Ernesto Jiménez-Ruiz, Guohui Xiao, Ahmet Soylu, Davide Lanti, Martin Rezk, Dmitriy Zheleznyakov, Martin Giese, Hallstein Lie (+4 others)
2017 Journal of Web Semantics  
of translating ontological queries into data queries and their execution over either a single DB of federated DBs; and a query formulation module to support query construction for engineers with a limited  ...  Our modules have been integrated in one OBDA system, deployed at Statoil, integrated with Statoil's infrastructure, and evaluated with Statoil's engineers and data.  ...  This work was partially funded by the EU project Optique (FP7-ICT-318338), the EPSRC projects MaSI 3 , DBOnto, ED 3 , the BIGMED project (IKT 259055), and the SIRIUS Centre for Scalable Data Access (Research  ... 
doi:10.1016/j.websem.2017.05.005 fatcat:ghpdmsaoizc6bgly4cuyxljvq4
« Previous Showing results 1 — 15 out of 275 results