Filters








266 Hits in 4.9 sec

Towards a Distributed, Scalable and Real-Time RDF Stream Processing Engine

Xiangnan Ren
2016 International Semantic Web Conference  
stream handling is required; iii) support and extend common continuous SPARQL syntax -easy-to-use, adapt to the industrial needs and iv) support reasoning services at both the data preparation and query  ...  In a nutshell, the engine aims to i) address basic event modeling -to guarantee the completeness of input data in window operators, ii) process real-time RDF stream in a distributed manner -efficient RDF  ...  optimization for this extended query languages, e.g., to support efficient query reformulation.  ... 
dblp:conf/semweb/Ren16 fatcat:ktpaymr7e5hefdonsfmx2vwnyy

Optimizing Analytical Queries over Semantic Web Sources [article]

Dilshod Ibragimov
2017 PhD series, Technical Faculty of IT and Design, ˜Aalborg=ålborgœ University  
The rewriting algorithm of MARVEL is able to rewrite analytical SPARQL queries based on a set of materialized views.  ...  In summary, the contributions of this chapter are: • a native RDF/SPARQL-based approach for efficient support of analytical queries over federations of SPARQL endpoints, • an extended vocabulary for specifying  ... 
doi:10.5278/vbn.phd.tech.00022 fatcat:5d2lmnicazgmze2qhe5cikowwm

The Optique Project: Towards OBDA Systems for Industry (Short Paper)

Diego Calvanese, Martin Giese, Peter Haase, Ian Horrocks, Thomas Hubauer, Yannis E. Ioannidis, Ernesto Jiménez-Ruiz, Evgeny Kharlamov, Herald Kllapi, Manolis Koubarakis, Steffen Lamparter, Ralf Möller (+10 others)
2013 W3C Web Ontology Language (OWL) Experiences and Directions Workshop (OWLED)  
In this paper we present the EU Optique project that aims at developing an end-to-end OBDA system for managing Big Data in industries.  ...  The ADP [10, 13] system for complex dataflow processing in the cloud is going to be the core part of the Optique's distributed query processing.  ...  Besides that, analytical tools are required for stream processing.  ... 
dblp:conf/owled/CalvaneseGHHHIJKKKLMNORRRSSSWZ13 fatcat:oalqzj53sfeb3cj6waopivim3e

Optique: Towards OBDA Systems for Industry [chapter]

Evgeny Kharlamov, Ernesto Jiménez-Ruiz, Dmitriy Zheleznyakov, Dimitris Bilidas, Martin Giese, Peter Haase, Ian Horrocks, Herald Kllapi, Manolis Koubarakis, Özgür Özçep, Mariano Rodríguez-Muro, Riccardo Rosati (+4 others)
2013 Lecture Notes in Computer Science  
This paper presents an initial architectural specification for the Optique system along with the individual system components.  ...  Fabio Savo for insightful discussions. The authors are supported by the EU project Optique (FP7-IP-318338).  ...  The distributed query execution is based on the ADP (Athena Distributed Processing) [26] a system for complex dataflow processing in the cloud.  ... 
doi:10.1007/978-3-642-41242-4_11 fatcat:axcmbjydbzfnth7f4gzl22dpky

Data management research at the technical university of crete

Stavros Christodoulakis, Minos Garofalakis, Euripides G.M. Petrakis, Antonios Deligiannakis, Vasilis Samoladas, Ekaterini Ioannou, Odysseas Papapetrou, Stelios Sotiriadis
2014 SIGMOD record  
Processing is based on a novel indexing structure that allows efficient access to the resolution-related information and a set of techniques for evaluating complex queries that include qualifiers for retrieving  ...  To this end, the SPARQL-RW Framework [9] provides a formal method and implementation for SPARQL query rewriting with respect to a set of predefined mappings between ontology schemas.  ... 
doi:10.1145/2590989.2590999 fatcat:ithsznixnzcafdkbnsuagqo5aa

Semantic access to streaming and static data at Siemens

Evgeny Kharlamov, Theofilos Mailis, Gulnar Mehdi, Christian Neuenstadt, Özgür Özçep, Mikhail Roshchin, Nina Solomakhina, Ahmet Soylu, Christoforos Svingos, Sebastian Brandt, Martin Giese, Yannis Ioannidis (+4 others)
2017 Journal of Web Semantics  
The platform is based on a number of novel techniques and components including a deployment module, BootOX for ontology and mapping bootstrapping, a query language STARQL that allows for a uniform querying  ...  of both streaming and static data, a highly optimised backend, ExaStream, for processing such data, and a query formulation interface, OptiqueVQS, that allows to formulate STARQL queries without prior  ...  For example, Ontop supports query optimisation during rewriting, but it does not compute efficient plans for unfolded queries.  ... 
doi:10.1016/j.websem.2017.02.001 fatcat:vbyec4wq3rc5nntgpp35bc4fwa

Optimizing RDF(S) queries on cloud platforms

HyeongSik Kim, Padmashree Ravindra, Kemafor Anyanwu
2013 Proceedings of the 22nd International Conference on World Wide Web - WWW '13 Companion  
The MapReduce paradigm is emerging as a platform of choice for large scale data processing and analytics due to its ease of use, cost effectiveness, and potential for unlimited scaling.  ...  MapReduce Job Compiler Logical-to-Physical Plan Translator ܳ Jena Rule Schema Closure ‫ݏ݃݊݅ܽܯ‬ ‫ݎ݂‬ ݄ܵܿ݁݉ܽ ‫ݏ݈ܾ݁ܽ݅ݎܸܽ‬ Query ܳ ௧ሺ"ோ,ሻ Rule-based Rewriter ܳ ௌሺ"ோ,ሻ Schema ‫݁ܿ݊݁ݎ݂݁݊ܫ‬ ‫݄ݐ݅ݓ‬ ‫݀݁ݐܿ݅ݎݐݏ݁ݎ‬  ...  more challenging since rewriting such queries for execution usually yields even more complex queries, which forms the multiple unions of conjunctive queries.  ... 
doi:10.1145/2487788.2487917 dblp:conf/www/KimRA13 fatcat:4v2uckujt5grvjwvklibbqqili

DiploCloud: Efficient and Scalable Management of RDF Data in the Cloud

Marcin Wylot, Philippe Cudre-Mauroux
2016 IEEE Transactions on Knowledge and Data Engineering  
In this paper, we describe DiploCloud, an efficient and scalable distributed RDF data management system for the cloud.  ...  Despite recent advances in distributed RDF data management, processing large-amounts of RDF data in the cloud is still very challenging.  ...  Template lists are mainly used for analytics and aggregate queries, as they allow to process long lists of literals efficiently.  ... 
doi:10.1109/tkde.2015.2499202 fatcat:mxxfq3jxwbbwllpbrjpmag3tau

A Survey of RDF Stores SPARQL Engines for Querying Knowledge Graphs [article]

Waqas Ali, Muhammad Saleem, Bin Yao, Aidan Hogan, Axel-Cyrille Ngonga Ngomo
2021 arXiv   pre-print
techniques for efficiently evaluating SPARQL queries in a local setting (on one machine).  ...  RDF has seen increased adoption in recent years, prompting the standardization of the SPARQL query language for RDF, and the development of local and distributed engines for processing SPARQL queries.  ...  Beyond processing joins, SPARQL engines must offer efficient support for more expressive query features: -Query Processing.  ... 
arXiv:2102.13027v4 fatcat:phontczhbfcvdjt5y75n3hfcge

Learning from the History of Distributed Query Processing - A Heretic View on Linked Data Management

Heiko Betz, Francis Gropengießer, Katja Hose, Kai-Uwe Sattler
2012 International Semantic Web Conference  
Recently, much effort has been put into the development of techniques for query processing over Linked Data.  ...  Being based upon techniques originally developed for distributed and federated databases, some of them inherit the same or similar problems.  ...  First, a benchmark should model a representative scenario -in case of TPC these are, among others, TPC-C for transaction processing and TPC-H for analytical queries.  ... 
dblp:conf/semweb/BetzGHS12 fatcat:uqnvywxmtzgehmkja3suvdqgfa

Linked Data-as-a-Service: The Semantic Web Redeployed [chapter]

Laurens Rietveld, Ruben Verborgh, Wouter Beek, Miel Vander Sande, Stefan Schlobach
2015 Lecture Notes in Computer Science  
As a consequence, in practice, there is no single uniform way to query the LOD Cloud today.  ...  The result is a repeatable, low-cost, open-source data publication process.  ...  Complex SPARQL queries are decomposed by clients into Triple Pattern Fragments.  ... 
doi:10.1007/978-3-319-18818-8_29 fatcat:yr7fzkfp5fbrhjckvn5wfzc65q

Cloud Based RDF Security: A Secured Data Model for Cloud Computing

Clara Arulanandu, Suma Murthy, Guruprasad Nagraj
2018 International Journal of Intelligent Engineering and Systems  
The query process incorporates the map reduce framework is for lessening the immense measure of employments.  ...  In this paper, a new secured data model for cloud computing is proposed which uses partial resource description framework (RDF) encryption and token based access control system in which sensitive data  ...  For reversing the SPARQL query, the MapReduce framework utilizes query rewriting, embedded enforcement and post processing enforcement policies.  ... 
doi:10.22266/ijies2018.0228.09 fatcat:77cbfnu4nfbv7hcbii336fifwq

Table of contents

2014 2014 IEEE 30th International Conference on Data Engineering Workshops  
Photos (Zhenxing Xu) Session 2: Query Processing 335 Towards Optimization of RDF Analytical Queries on MapReduce (Padmashree Ravindra) Predictive Query Processing On Moving Objects (Abdeltawab M.  ...  Re-Optimization Based on Runtime Dependency Mining (Emeric Viel, Haruyasu Ueda) Session 3: System Architecture 207 Curracurrong Cloud: Stream Processing in the Cloud (Vasvi Kakkad, Akon Dey, Alan  ... 
doi:10.1109/icdew.2014.6818287 fatcat:znsnyupxufc47jk5eyej5udm54

Addressing Streaming and Historical Data in OBDA Systems: Optique's Approach

Ian Horrocks, Thomas Hubauer, Ernesto Jiménez-Ruiz, Evgeny Kharlamov, Manolis Koubarakis, Ralf Möller, Konstantina Bereta, Christian Neuenstadt, Özgür L. Özçep, Mikhail Roshchin, Panayiotis Smeros, Dmitriy Zheleznyakov
2013 Extended Semantic Web Conference  
We present the Optique project that addresses this problem by developing an Ontology Based Data Access (OBDA) system that incorporates novel tools and methodologies for processing and analyses of temporal  ...  This tasks bring up importance of both streaming and historical (temporal) data in the Big Data challenge for industries.  ...  , • query answering, and • processing and analytics of streaming and temporal data.  ... 
dblp:conf/esws/HorrocksHJKKMBNORSZ13 fatcat:sadbbehy3rfdfowswazgxxvtce

Scalable End-User Access to Big Data [chapter]

Martin Giese, Diego Calvanese, Peter Haase, Ian Horrocks, Yannis Ioannidis, Herald Kllapi, Manolis Koubarakis, Maurizio Lenzerini, Ralf Möller, Mariano Muro, Özgür Özçep, Riccardo Rosati (+4 others)
2013 Big Data Computing  
possibly including streaming sources; • They are unable to query those sources on their own, but are dependent on assistance from IT experts; • The turnaround time for information requests is in the range  ...  This chapter proposes steps towards the solution to the data access problem that end-users typically face when dealing with Big Data: • They need to pose ad hoc queries to a collection of data sources,  ...  rewriting, temporal and streaming data processing, and query execution on elastic clouds.  ... 
doi:10.1201/b16014-9 fatcat:3kjl6gnc7badpjskpigoqqcf5u
« Previous Showing results 1 — 15 out of 266 results