Juan F. Sequeda

I am a Ph.D Candidate and a NSF Graduate Research Fellow at the Department of Computer Sciences at the University of Texas at Austin. I am a member of the Research in Bioinformatics and Semantic Web (RiBS) Lab. My advisor is Daniel P. Miranker.

I started my undergrad at the Escuela de Ingeneria de Sistemas y Computacion at the Universidad del Valle in Cali, Colombia, transfered to the University of Texas at Austin in 2006 and received my B.S. in Computer Sciences in 2008.

Picture taken by Sean Bechhofer at SSSW2012

Contact Info

jsequeda@cs.utexas.edu
GDC (Gates Dell Complex) 7.416
My Curriculum Vitae
DBLP
Google Scholar

Research Interest

My research interest lies in the intersection between Semantic Web/Linked Data and Relational Databases and Data Integration.

What is the Semantic Web?

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Ultrawrap

The Semantic Web’s promise to achieve web-wide data integration requires the inclusion of legacy relational data as RDF, which, in turn, requires the execution of SPARQL queries on the legacy relational database. In this research, we explore a hypothesis: existing commercial relational databases already subsume the algorithms and optimizations needed to support effective SPARQL execution on existing relationally stored data .

Ultrawrap is a Relational Database to RDF (RDB2RDF) system, which encodes a logical representation of the database as a graph using SQL views and a simple syntactic translation of SPARQL queries to SQL queries on those views. Thus, in the course executing a SPARQL query, the SQL optimizer both instantiates a mapping of relational data to RDF and optimizes its execution. Other approaches, such as D2RQ, typically implement aspects of query optimization and execution outside the SQL environment.

Ultrawrap has been evaluated with the Barton and Berlin SPARQL Benchmark across the three major relational database management systems. We identify two important optimizations: detection of unsatisfiable conditions and self-join elimination, such that, when applied, SPARQL queries execute at nearly the same speed as semantically equivalent native SQL queries.

Getting Ultrawrap

Ultrawrap is currently being commercialized by Capsenta. Please contact ultrawrap@capsenta.com for inquiries.

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Publications

Journal

  • Zachary Elkins, Tom Ginsburg, James Melton, Robert Shaffer, Juan F. Sequeda, Daniel P. Miranker. (2014) Constitute: The World's Constitutions to Read, Search and Compare. To appear in Journal of Web Semantics.
  • Juan F. Sequeda, Daniel P. Miranker. (2013) Ultrawrap: SPARQL Execution on Relational Data. Journal of Web Semantics. Volume 22, October 2013, Pages 19–39 [link] [preprint]
  • Marcelo Arenas, Claudio Gutierrez, Daniel P. Miranker, Jorge Perez and Juan F. Sequeda. (2012) Querying Semantic Data on the Web. SIGMOD Record 41(4): 6-17 [pdf]
  • Juan F. Sequeda, Syed Hamid Tirmizi, Oscar Corcho, Daniel P. Miranker. (2011) Survey of directly mapping SQL databases to the Semantic Web. Knowledge Eng. Review 26(4): 445-486 [link]
  • Syed H. Tirmizi, S. Aitken, D. Moreira, C. Mungall, Juan F. Sequeda, N.H. Shah, Daniel P. Miranker. (2011) Mapping between the OBO and OWL ontology languages. Journal of Biomedical Semantics 2011, 2(Suppl 1):S3 [pdf]

Book Chapter

  • Juan Sequeda, Daniel P. Miranker. (2014) Mapping Relational Databases to Linked Data. In Andreas Harth, Katja Hose, Ralf Schenkel (Eds). Linked Data Management (pp.95-116). CRC Press/Taylor & Francis Group [link]

Conferences

  • Juan Sequeda, Marcelo Arenas, Daniel P. Miranker. (2014) OBDA: Query Rewriting or Materialization? In Practice, Both! ISWC 2014. [link]
  • Freddy Priyatna, Oscar Corcho, Juan Sequeda. (2014) Formalisation and experiences of R2RML-based SPARQL to SQL query translation using morph. WWW 2014. [pdf]
  • Aibo Tian, Juan Sequeda, Daniel P. Miranker. (2013) QODI: Query as Context in Automatic Data Integration. ISWC 2013. Nominated to Research Track Best Student Paper Award [link] [pdf]
  • Philippe Cudré-Mauroux, Iliya Enchev, Sever Fundatureanu, Paul Groth, Albert Haque, Andreas Harth, Felix Leif Keppmann, Daniel Miranker, Juan Sequeda, Marcin Wylot. (2013) NoSQL Databases for RDF: An Empirical Evaluation. ISWC 2013.
  • Juan Sequeda, Marcelo Arenas, Daniel P. Miranker. (2012) Ontology-based Data Access using Views. RR 2012. [link]
  • Juan Sequeda, Marcelo Arenas, Daniel P. Miranker. (2012) On directly mapping relational databases to RDF and OWL. WWW 2012. [pdf]
  • Syed H. Tirmizi Juan F. Sequeda, Daniel P. Miranker. (2008) Translating SQL Applications to the Semantic Web. DEXA 2008. [link]

Workshops

  • Juan F. Sequeda, Freddy Priyatna and Boris Villazon-Terrazas. (2012) Relational Database to RDF Mapping Patterns. 3rd Workshop on Ontology Patterns (WOP2012) at ISWC 2012. [pdf]
  • Aibo Tian, Juan F. Sequeda, Daniel P. Miranker. (2012) On Ambiguity and Query-Specific Ontology Mapping. Ontology Matching Workshop (OM2012) at ISWC 2012. [pdf]
  • Daniel P. Miranker, Rodolfo K. Depena, Hyunjoon Jung, Juan F. Sequeda and Carlos Reyna. (2012) Diamond: A SPARQL Query Engine, for Linked Data Based on the Rete Match. Artificial Intelligence meets the Web of Data Workshop, co-located at ECAI 2012
  • Juan F. Sequeda Oscar Corcho. Asuncion Gomez-Perez. (2009) Linked Stream Data: a short paper. 2nd Semantic Sensor Network Workshop at ISWC 2009 [pdf]
  • Juan F. Sequeda Oscar Corcho. (2009) Generating Data Wrapping Ontologies from Sensor Networks: a case study. 2nd Semantic Sensor Network Workshop at ISWC 2009 [pdf]
  • Syed Hamid Tirmizi, Stuart Aitken, Dilvan A. Moreira, Chris Mungall, Juan F. Sequeda, Nigam H. Shah, Daniel P. Miranker: OBO & OWL: Roundtrip Ontology Transformations. SWAT4LS 2009
  • Juan F. Sequeda. Syed H. Tirmizi Miranker, Daniel P. Miranker. (2007) SQL Databases are a Moving Target. Position Paper for W3C Workshop on RDF Access to Relational Databases. [pdf]

Poster and Demos

  • Juan F. Sequeda (2013) On the Semantics of R2RML and its Relationship with the Direct Mapping. ISWC 2013.
  • Aibo Tian, Juan F. Sequeda, Daniel P. Miranker (2012) Queries, the Missing Link in Automatic Data Integration. ISWC 2012. [pdf]
  • Daniel P. Miranker, Rodolfo K. Depena, Hyunjoon Jung, Juan F. Sequeda and Carlos Reyna. (2012) Diamond Debugger Demo: Rete-Based Processing of Linked Data. 6th International Rule Challenge at RuleML 2012
  • Juan F. Sequeda, Marcelo Arenas, Daniel P. Miranker (2011) A Commpletely Automatic Direct Mapping of Relational Databases to RDF and OWL. ISWC 2011. [pdf]
  • Juan F. Sequeda, Daniel P. Miranker (2011) SPARQL Execution as Fast as SQL Execution on Relational Data. ISWC 2011. [pdf]
  • Juan F. Sequeda, Rodolfo Depena, Daniel P. Miranker. (2009) Ultrawrap: Using SQL Views for RDB2RDF. ISWC 2009. [pdf] [poster]
  • Juan F. Sequeda, Syed H. Tirmizi, Daniel P. Miranker. (2008) A Bootrstrapping Architecture for Integration of Relational Databases to the Semantic Web. ISWC 2008. [pdf]
  • Garcia-Castro, A. Norena, A. Betancourt, A. Garcia, L. Juan F. Sequeda (2008) CMAPS supporting the development of OWL Ontologies. ISWC 2008. [pdf]

Tutorial

  • Juan F. Sequeda, Daniel P. Miranker. (2014) Relational Database to RDF (RDB2RDF) Tutorial: The R2RML and Direct Mapping Standards, from Theory to Practice. Tutorial at the 5th International Conference on Biomedical Ontologies (ICBO2014). Houston, Texas
  • Juan F. Sequeda, Barry Norton, Daniel P. Miranker. (2013) Relational Database to RDF (RDB2RDF) Tutorial: Theory and Practice. Tutorial at the 10th Extended Semantic Web Conference (ISWC2013). Sydney, Australia [website]
  • Juan F. Sequeda, Barry Norton, Daniel P. Miranker. (2013) Relational Database to RDF (RDB2RDF) Tutorial: Theory and Practice. Tutorial at the 10th Extended Semantic Web Conference (ESWC2013). Montpellier, France [website]
  • Olaf Hartig, Juan F. Sequeda, Patrick Sinclair, Jamie Taylor. (2010) How to Consume Linked Data on the Web. Tutorial at the 19th World Wide Web Conference (WWW2010). Washington DC, US [website]
  • Juan F. Sequeda, Olaf Hartig, Patrick Sinclair, Jamie Taylor. (2009) How to Consume Linked Data on the Web. Tutorial at the 8th International Semantic Web Conference (ISWC2009). Washington DC, US [website]

Technical Reports

  • Juan F. Sequeda, Daniel P. Miranker. (2012) Ultrawrap: SPARQL Execution on Relational Data. University of Texas at Austin. Department of Computer Science. Technical Report# TR-12-10. [pdf]
  • Marcelo Arenas, Alexandre Bertails, Eric Prud'hommeaux, Juan F. Sequeda. (2012) A Direct Mapping of Relational Data to RDF. W3C Proposed Recommendation 14 August 2012 [link]
  • Juan F. Sequeda, Marcelo Arenas, Daniel P. Miranker. (2011) On Directly Mapping Relational Databases to RDF and OWL (extended version). Technical Report arXiv:1202.3667v3. [pdf]
  • Juan F. Sequeda Garcia-Castro, A. Oscar Corcho. Syed H. Tirmizi Miranker, D. (2009) Overcoming database heterogeneity to facilitate social networks: the Colombian displaced population as a case study. Invited Paper at WWW in Iberoamerica Track. WWW 2009. [pdf]
  • Sahoo, S. Halb, W. Hellmann, S. Idehen, K. Thibodeau, T. Auer, S. Juan F. Sequeda. Ezzat, A. (2009)A Survey of Current Approaches for Mapping of Relational Databases to RDF . W3C RDB2RDF XG Report [pdf]
  • Juan F. Sequeda Syed H. Tirmizi Oscar Corcho. Daniel P. Miranker (2009) Direct Mapping SQL Databases to the Semantic Web. Technical Report 09-04. The University of Texas at Austin, Department of Computer Sciences. [pdf]
  • Juan F. Sequeda (2008) On Direct Mapping for Integrating SQL Databases to the Semantic Web. Bachelors Thesis. Technical Report 08-09. The University of Texas at Austin, Department of Computer Sciences. [pdf]
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Services

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Awards & Honors

Conference

  • 2013 - 2nd Place in the Semantic Web Challenge for "Constitute: The World's Constitutions to Read, Search and Compare"
  • 2013 - Nominated to Research Track Best Student Paper Award for the paper "QODI: Query as Context in Automatic Data Integration"

Scholarships and Fellowships

  • 2010 - 2013 National Science Foundation Graduate Fellowship
  • 2009 Honorable Mention National Science Foundation Graduate Fellowship
  • 2008 - 2009 University of Texas Graduate School Diversity Fellowship
  • 2007 - 2008 National Instruments Endowed Scholarship for Excellence
  • 2007 Intel Foundation Undergraduate Research Fellowship

Travel Awards

  • 2013 International Semantic Web Conference - Sydney, Australia
  • 2012 International Conference on Web Reasoning and Rule Systems - Vienna, Austria
  • 2011 International Semantic Web Conference - Bonn, Germany
  • 2009 International Semantic Web Conference - Virginia, USA
  • 2009 World Wide Web Conference - Madrid, Spain
  • 2008 International Semantic Web Conference - Karslruhe, Germany
  • 2008 Pan-American Advanced Studies Institute: Cyberinfrastructure for International Collaborative Biodiversity and Ecological Informatics - San Jose, Costa Rica

Press

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What is the Semantic Web?

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