Publications of the DBIS Research Group

2019

Victor Anthony Arrascue Ayala, Polina Koleva, Anas Alzogbi, Matteo Cossu, Michael Färber, Patrick Philipp, Guilherme Schievelbein, Io Taxidou, Georg Lausen:
Relational schemata for distributed SPARQL query processing. [.pdf]
International Workshop on Semantic Big Data (SBD@SIGMOD 2019)
Anas Alzogbi, Polina Koleva, Georg Lausen:
Towards Distributed Multi-model Learning on Apache Spark for Model-based Recommender. [ .pdf ]
Proceedings of the 35th International Conference on Data Engineering Workshops, 2019 IEEE (ICDEW 2019). International Workshop on Recommender Systems with Big Data (RSDB). Macau, China. April 08, 2019

2018

Victor Anthony Arrascue Ayala, Georg Lausen:
A Flexible N-Triples Loader for Hadoop. [.pdf]
International Semantic Web Conference (P&D) (ISWC 2018)
Anas Alzogbi:
Time-aware Collaborative Topic Regression: Towards Higher Relevance in Textual Item Recommendation. [.pdf]
Proceedings of the 3rd Joint Workshop on Bibliometric-enhanced Information Retrieval and Natural Language Processing for Digital Libraries (BIRNDL 2018) co-located with the 41st International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2018). Ann Arbor Michigan, U.S.A. July 12, 2018
Matteo Cossu, Michael Färber, Georg Lausen:
PRoST: Distributed Execution of SPARQL Queries Using Mixed Partitioning Strategies. [.pdf]
Proceedings of the 21th International Conference on Extending Database Technology (EDBT 2018). Vienna, Austria, March 26-29, 2018.

2017

Victor Anthony Arrascue Ayala, Kemal Cagin Gülsen, Marco Muñiz, Anas Alzogbi, Michael Färber, Georg Lausen:
A Delay-Robust Touristic Plan Recommendation Using Real-World Public Transportation Information. [ .pdf ]
In Proc. of the Workshop on Recommenders in Tourism (RecTour 2017) at the 11th ACM Conference on Recommender Systems (RecSys 2017). Como, Italy, August 27th, 2017
Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Querying Semantic Knowledge Bases with SQL-on-Hadoop [ .pdf ]
Proc. of the 4th ACM SIGMOD Workshop on Algorithms and Systems for MapReduce and Beyond, (BeyondMR@SIGMOD 2017). Chicago, IL (USA), May 2017.
Victor Anthony Arrascue Ayala, Trong-Nghia Cheng, Anas Alzoghbi, Georg Lausen:
Learning to Identify Complementary Products from DBpedia. [ .pdf ]
In Proc. of the Workshop on Linked Data on the Web (LDOW 2017) at the 26th International World Wide Web Conference (WWW 2017). Perth, WA, Australia, April 3rd, 2017

2016

Anas Alzoghbi, Victor Anthony Arrascue Ayala, Peter M Fischer, Georg Lausen:
Learning-toRank in research paper CBF recommendation: Leveraging irrelevant papers [ .pdf ]
In Proc. of the 3rd Workshop on New Trends in Content-Based Recommender Systems (CBRecSys 2016) co-located with ACM Conference on Recommender Systems (RecSys 2016). Boston, MA, USA, September 16, 2016
Alexander Schätzle, Martin Przyjaciel-Zablocki, Simon Skilevic, Georg Lausen:
S2RDF: RDF Querying with SPARQL on Spark [ .pdf ]
Proceedings of the VLDB Endowment (PVLDB), Volume 9, No. 10, June 2016.
42nd International Conference on Very Large Data Bases (VLDB 2016). New Delhi (India), September 2016.

2015

Alexander Schätzle, Martin Przyjaciel-Zablocki, Simon Skilevic, Georg Lausen:
S2RDF: RDF Querying with SPARQL on Spark [ Tech. Report ]
Computing Research Repository (CoRR), December 2015.
Anas Alzoghbi, Victor Anthony Arrascue Ayala, Peter M Fischer, Georg Lausen:
PubRec: Recommending Publications Based On Publicly Available Meta-Data [ .pdf ]
In Proc. of the LWA 2015 Workshops: KDML, FGWM, IR, and FGDB. Trier, Germany, October 7-9, 2015
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thorsten Berberich, Georg Lausen:
S2X: Graph-Parallel Querying of RDF with GraphX [ .pdf ]
Biomedical Data Management and Graph Online Querying, VLDB 2015 Workshops (Big-O(Q) 2015) and DMAH, Revised Selected Papers, volume 9579 of Lecture Notes in Computer Science (LNCS), pages 155-168.
Hawaii (USA), August 2015.
Victor Anthony Arrascue Ayala, Anas Alzoghbi, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Speeding up Collaborative Filtering with Parametrized Preprocessing [ .pdf ]
In Proc. of the 6th International Workshop on Social Recommender Systems (SRS 2015),
in conjunction with the 2015 ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD 2015). Sydney, Australia, August 2015.
Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
TriAL-QL: Distributed Processing of Navigational Queries [ .pdf ] (Best Paper Runner-Up Award)
Proc. of 18th International Workshop on the Web and Databases (WebDB 2015)
at SIGMOD 2015. Melbourne (Australia), June 2015.
Io Taxidou, Anas Alzoghbi, Peter M. Fischer, Christoph Schöller:
Predicting Lifetime of Information Cascades[ .pdf ].
ACM Web Science 2015
Martin Przyjaciel-Zablocki, Alexander Schätzle, Adrian Lange:
TriAL-QL: Distributed Processing of Navigational Queries [ .pdf ]
Proc. of the 9th Alberto Mendelzon International Workshop on Foundations of Data Management (AMW 2015)
Lima (Peru), May 2015.
Peter M. Fischer, Georg Lausen, Alexander Schätzle, Michael Schmidt:
RDF Constraint Checking [ .pdf ]
Proc. of the Workshops of the EDBT/ICDT 2015 Joint Conference (CEUR).
5th International Workshop on Linked Web Data Management (LWDM 2015). Brussels (Belgium).

2014

Alexander Schätzle, Martin Przyjaciel-Zablocki, Antony Neu, Georg Lausen:
Sempala: Interactive SPARQL Query Processing on Hadoop [ .pdf ]
Proc. of the 13th International Semantic Web Conference (ISWC 2014). Riva del Garda (Italy).
Martin Przyjaciel-Zablocki, Thomas Hornung, Alexander Schätzle, Sven Gauß, Io Taxidou, Georg Lausen:
MUSE: A Music Recommendation Management System [ .pdf ] [ Poster ]
Proc. of the 15th International Society for Music Information Retrieval Conference (ISMIR 2014). Taipei (Taiwan), October 2014
Cai-Nicolas Ziegler, Thomas Hornung, Martin Przyjaciel-Zablocki, Sven Gauß, Georg Lausen:
Music Recommenders Based on Hybrid Techniques and Serendipity [ .pdf ]
Journal: Web Intelligence and Agent Systems (WIAS) 12(3):235-248 (2014)
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
Large-Scale RDF Processing with MapReduce [ Book ]
Large Scale and Big Data - Processing and Management 2014: 151--182. Auerbach Publications 2014
Georg Lausen, Michael Schmidt:
RDF Data Descriptions [ .pdf ]
Proc. of the 8th Alberto Mendelzon Workshop on Foundations of Data Management (AMW 2014). Cartagena de Indias (Colombia), June 2014.
Victor Anthony Arrascue Ayala, Martin Przyjaciel-Zablocki, Thomas Hornung, Alexander Schätzle, Georg Lausen:
Extending SPARQL for Recommendations [ .pdf ]
Proc. of the 6th International Workshop on Semantic Web Information Management (SWIM 2014),
in conjunction with SIGMOD 2014. Snowbird, Utah (USA), June 2014.
Anas Alzoghbi, Peter M. Fischer, Anna Gossen, Peter Haase, Thomas Hornung, Beibei Hu, Georg Lausen, Christoph Pinkel, Michael Schmidt:
Durchblick - A Conference Assistance System for Augmented Reality Devices [ .pdf ]
In Proc. of the 11th Extended Semantic Web Conference: Posters & Demonstrations Track (ESWC 2014). Heraklion (Greece), May 2014.
Liaquat Ali, Thomas Janson, and Christian Schindelhauer:
Towards Load Balancing and Parallelizing of RDF Query Processing in P2P Based Distributed RDF Data Stores [ .pdf ]
22nd Euromicro International Conference on Parallel, Distributed and network-based Processing (PDP 2014). Turin (Italy).

2013

Martin Przyjaciel-Zablocki, Alexander Schätzle, Eduard Skaley, Thomas Hornung, Georg Lausen:
Map-Side Merge Joins for Scalable SPARQL BGP Processing [ .pdf ]
Proc. of the 5th IEEE International Conference on Cloud Computing Technology and Science, (CloudCom 2013). Bristol (UK).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
PigSPARQL: A SPARQL Query Processing Baseline for Big Data [ .pdf ] [ Poster ]
Proc. of the ISWC 2013 Posters & Demonstrations Track (ISWC 2013). Sydney (Australia).
Michael Schmidt, Georg Lausen:
Pleasantly Consuming Linked Data with RDF Data Descriptions[ .pdf ]
Proc. of the Fourth International Workshop on Consuming Linked Data, COLD 2013, Sydney, Australia, October 22, 2013. CEUR Workshop Proceedings, vol. 1034.
Cai-Nicolas Ziegler, Alexandru Oprea, Thomas Hornung, Holger Eggs, Georg Lausen:
Recommending Software Apps in a B2B Context
Proc. of the 12th IEEE/WIC/ACM International Conference on Web Intelligence (WI 2013). Atlanta, GA (USA).
Thomas Hornung, Cai-Nicolas Ziegler, Simon Franz, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
Evaluating Hybrid Music Recommender Systems [ .pdf ]
Proc. of the 12th IEEE/WIC/ACM International Conference on Web Intelligence (WI 2013). Atlanta, GA (USA).
Simon Franz, Thomas Hornung, Cai-Nicolas Ziegler, Martin Przyjaciel-Zablocki, Alexander Schätzle, Georg Lausen:
On Weighted Hybrid Track Recommendations [ .pdf ]
Proc. of the 13th International Conference on Web Engineering (ICWE 2013). Aalborg (Denmark).
Alexandru Oprea, Thomas Hornung, Cai-Nicolas Ziegler, Holger Eggs, Georg Lausen:
A Hybrid B2B App Recommender System [ .pdf ]
Proc. of the 13th International Conference on Web Engineering (ICWE 2013). Aalborg (Denmark).
Liaquat Ali, Thomas Janson, Georg Lausen, and Christian Schindelhauer:
Effects of Network Structure Improvement on Distributed RDF Querying [ .pdf ]
6th International Conference on Data Management in Cloud, Grid and P2P Systems (Globe 2013). Prague (Czech Republic).
Alexander Schätzle, Antony Neu, Georg Lausen, Martin Przyjaciel-Zablocki:
Large-Scale Bisimulation of RDF Graphs [ .pdf ] (Best Paper Award)
Proc. of the Fifth Workshop on Semantic Web Information Management (SWIM 2013),
in conjunction with the 2013 ACM International Conference on Management of Data (SIGMOD 2013). New York (USA).
Anas Alzoghbi, Georg Lausen:
Similar Structures Inside RDF-Graphs [ .pdf ]
WWW Workshop on Linked Data on the Web (LDOW 2013), Rio de Janeiro, Brazil, 14 May, 2013, in CEUR Workshop Proceedings Vol. 996.
Thomas Hornung, Wolfgang May:
Experiences from a TBox Reasoning Application: Deriving a Relational Model by OWL Schema Analysis [ .pdf ]
Proc. of the Tenth OWL: Experiences and Directions Workshop (OWLED 2013),
co-located with the 10th Extended Semantic Web Conference (ESWC 2013). Montpellier (France).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Io Taxidou:
Towards a SPARQL 1.1 Feature Benchmark on Real-World Social Network Data [ .pdf ]
Proc. of the First International Workshop on Benchmarking RDF Systems (BeRSys 2013),
co-located with the 10th Extended Semantic Web Conference (ESWC 2013). Montpellier (France).

2012

Alexander Schätzle, Martin Przyjaciel-Zablocki, Christopher Dorner, Thomas Hornung, Georg Lausen:
Cascading Map-Side Joins over HBase for Scalable Join Processing [ .pdf ]
Proc. of the Joint Workshop on Scalable and High-Performance Semantic Web Systems (SSWS+HPCSW 2012),
in conjunction with the International Semantic Web Conference (ISWC 2012). Boston (USA).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Christopher Dorner, Georg Lausen:
Cascading Map-Side Joins over HBase for Scalable Join Processing [ Tech. Report ]
Computing Research Repository (CoRR), June 2012.
Liaquat Ali, Georg Lausen:
Evaluating SPARQL Subqueries Over P2P Overlay Networks [ .pdf ]
11th International Workshop on Web Semantics (WebS 2012),
in conjunction with the 23rd International Conference on Database and Expert Systems Applications (DEXA 2012). Vienna (Austria).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Georg Lausen:
RDFPath: Path Query Processing on Large RDF Graphs with MapReduce (extended revised version) [ .pdf ]
The Semantic Web: ESWC 2011 Workshops, Revised Selected Papers, LNCS 7117, pp. 50–64, Springer, 2012.

2011

Florian Schmedding
Incremental SPARQL Evaluation for Query Answering on Linked Data [ .pdf ]
Second International Workshop on Consuming Linked Data (COLD2011),
in conjunction with the 10th International Semantic Web Conference (ISWC 2011). Bonn, Germany.
Liaquat Ali, Thomas Janson, Georg Lausen:
3rdf: Storing and Querying RDF Data on top of the 3nuts Overlay Network[ .pdf ]
10th International Workshop on Web Semantics (WebS 2011),
in conjunction with the 22nd International Conference on Database and Expert Systems Applications (DEXA 2011). Toulouse (France).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Georg Lausen:
PigSPARQL: Mapping SPARQL to Pig Latin [ .pdf ]
3rd International Workshop on Semantic Web Information Management (SWIM 2011),
in conjunction with the 2011 ACM International Conference on Management of Data (SIGMOD 2011). Athens (Greece).
Martin Przyjaciel-Zablocki, Alexander Schätzle, Thomas Hornung, Georg Lausen:
RDFPath: Path Query Processing on Large RDF Graphs with MapReduce [ .pdf ]
1st Workshop on High-Performance Computing for the Semantic Web (HPCSW 2011),
collocated with 8th Extended Semantic Web Conference (ESWC 2011). Heraklion (Greece).
Alexander Schätzle, Martin Przyjaciel-Zablocki, Thomas Hornung, Georg Lausen:
PigSPARQL: Übersetzung von SPARQL nach Pig Latin [ .pdf ]
In Proc. 14th conference on Database Systems for Business, Technology and Web (BTW 2011).
Kaiserslautern (Germany).

2010

Georg Gottlob, Reinhard Pichler, Fang Wei:
Tractable database design and datalog abduction through bounded treewidth.
Inf. Syst. 35(3): 278-298 (2010)
Fang Wei:
Efficient Graph Reachability Query Answering Using Tree Decomposition [ .pdf ]
In Reachability Problems, 4th International Workshop, (RP 2010), Brno, Czech Republic, August, 2010
Fang Wei:
TEDI: Efficient Shortest Path Query Answering on Graphs [ .pdf ]
In Proceedings of the ACM SIGMOD International Conference on Management of Data, (SIGMOD 2010), June 2010, Indiana (USA).
Michael Meier, Michael Schmidt, Fang Wei, Georg Lausen:
Semantic Query Optimization in the Presence of Types [ .pdf ]
In Proc. of Symposium on Principle of Database Systems (PODS), June 2010, Indiana (USA).
Michael Schmidt, Michael Meier, Georg Lausen:
Foundations of SPARQL Query Optimization [ .pdf ]
In Proc. 13^th International Conference on Database Theory (ICDT), March 2010, Lausanne (Switzerland).
Georg Gottlob, Reinhard Pichler, Fang Wei:
Bounded treewidth as a key to tractability of knowledge representation and reasoning
Artificial Intelligence, 174(1), 105-132, 2010.

2009

Thomas Hornung, Wolfgang May:
Semantic Annotations and Querying of Web Data Sources
In Proc. of the 17^th International Conference on Cooperative Information Systems (CoopIS 2009), November 2009, Vilamoura (Portugal).
Thomas Hornung, Wolfgang May:
Ontology-Based Support for Graph Algorithms in Online Exploration Workflows (Poster)
In Proc. of the 8^th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE 2009), November 2009, Vilamoura (Portugal).
Florian Schmedding:
Content-sensitive User Interfaces for Annotated Web Pages
In Proc. of the 4^th International Workshop on Applications of Semantic Technologies, GI-Jahrestagung, October 2009, Lübeck, Germany.
Hannes Eder, Fang Wei:
Evaluation of skyline algorithms in PostgreSQL
International Database Engineering and Applications Symposium (IDEAS 2009), September 2009, Cetraro, Calabria, (Italy).
Michael Meier, Michael Schmidt, Georg Lausen:
On Chase Termination Beyond Stratification [ Tech. Report ]
In Proc. 35^th International Conference on Very Large Databases (VLDB), August 2009, Lyon (France).
Thomas Hornung, Wolfgang May:
Process Algebra-Based Query Workflows
In Proc. of the 21^st International Conference on Advanced Information Systems (CAISE), June 2009, Amsterdam (The Netherlands).
Florian Schmedding, Max Schwaibold, Kai Simon:
Pattern-based Annotation of HTML-streams
In Proc. of the 6^th European Semantic Web Conference (ESWC), June 2009, Heraklion (Greece).
Florian Schmedding, Max Schwaibold:
Integrating Feedback into Web Pages (Poster)
6^th European Semantic Web Conference (ESWC), June 2009, Heraklion (Greece).
Michael Meier, Michael Schmidt, Georg Lausen:
Stop the Chase [ Extended Abstract | Tech. Report ]
In III Proc. Alberto Mendelzon International Workshop on Foundations of Data Management (AMW), May 2009, Arequipa (Peru).
Thomas Hornung, Wolfgang May:
Deep Web Queries in a Semantic Web Environment
In 2^nd Workshop on Advances in Accessing Deep Web (ADW 2009), co-located with 12^th International Conference on Business Information Systems (BIS 2009), April 2009, Poznan (Poland).
Michael Schmidt, Thomas Hornung, Georg Lausen, Christoph Pinkel:
SP²Bench: A SPARQL Performance Benchmark [ .pdf | Tech. Report ]
In Proc. IEEE 25^th International Conference on Data Engineering (ICDE), March 2009, Shanghai (China).