Sven Helmer

Carlos D. Barranco, Sven Helmer: An impact ordering approach for indexing fuzzy sets. Fuzzy Sets and Systems 196: 33-46 (2012)

Georgia Garani, Sven Helmer: Integrating Star and Snowflake Schemas in Data Warehouses. IJDWM 8(4): 22-40 (2012)

Sven Helmer, Nikolaus Augsten, Michael H. Böhlen: Measuring structural similarity of semistructured data based on information-theoretic approaches. VLDB J. 21(5): 677-702 (2012)

Andrew McDonald, Sven Helmer: A Comparative Case Study of Indonesian and UK Organisational Culture Differences in IS Project Management. IJTHI 7(2): 28-37 (2011)

Denise Y. Arnold, Sven Helmer, Rodolfo Velásquez Arando: Towards Building a Knowledge Base for Research on Andean Weaving. BNCOD 2009: 180-188

Tadeusz Litak, Sven Helmer: On the Termination Problem for Declarative XML Message Processing. DEXA 2009: 83-97

Carlos D. Barranco, Sven Helmer: Increasing the Performance of Fuzzy Retrieval Using Impact Ordering. IFSA/EUSFLAT Conf. 2009: 957-962

Alexandre Guitton, Niki Trigoni, Sven Helmer: Fault-Tolerant Compression Algorithms for Delay-Sensitive Sensor Networks with Unreliable Links. DCOSS 2008: 190-203

Sven Helmer, Robin Aly, Thomas Neumann, Guido Moerkotte: Indexing Set-Valued Attributes with a Multi-level Extendible Hashing Scheme. DEXA 2007: 98-108

Sven Helmer: An Interval-Based Index Structure for Structure Elucidation in Chemical Databases. IFSA (1) 2007: 625-634

Sven Helmer: Measuring the Structural Similarity of Semistructured Documents Using Entropy. VLDB 2007: 1022-1032

Norman May, Sven Helmer, Guido Moerkotte: Strategies for query unnesting in XML databases. ACM Trans. Database Syst. 31(3): 968-1013 (2006)

Thomas Neumann, Sven Helmer, Guido Moerkotte: On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. BNCOD 2006: 115-126

Matthias Brantner, Carl-Christian Kanne, Guido Moerkotte, Sven Helmer: Algebraic Optimization of Nested XPath Expressions. ICDE 2006: 128

Matthias Brantner, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Kappa-Join: Efficient Execution of Existential Quantification in XML Query Languages. XSym 2006: 1-15

Aleksei Pavlov, Sven Helmer, Guido Moerkotte: A Model-Based Monitoring and Diagnosis System for a Space-Based Astrometry Mission. DEXA 2005: 920-929

Thomas Neumann, Sven Helmer, Guido Moerkotte: On the Optimal Ordering of Maps and Selections under Factorization. ICDE 2005: 490-501

Matthias Brantner, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Full-fledged Algebraic XPath Processing in Natix. ICDE 2005: 705-716

Vasco Amaral, Sven Helmer, Guido Moerkotte: Formally Specifying the Syntax and Semantics of a Visual Query Language for the Domain of High Energy Physics Data Analysis. VL/HCC 2005: 251-258

Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Evaluating lock-based protocols for cooperation on XML documents. SIGMOD Record 33(1): 58-63 (2004)

Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Timestamp-Based Protocols for Synchronizing Access on XML Documents. DEXA 2004: 591-600

Vasco Amaral, Sven Helmer, Guido Moerkotte: PHEASANT: A PHysicist's EAsy ANalysis Tool. FQAS 2004: 229-242

Norman May, Sven Helmer, Guido Moerkotte: Nested Queries and Quantifiers in an Ordered Context. ICDE 2004: 239-250

Norman May, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: XQuery Processing in Natix with an Emphasis on Join Ordering. XIME-P 2004: 49-54

Sven Helmer: Evaluating different approaches for indexing fuzzy sets. Fuzzy Sets and Systems 140(1): 167-182 (2003)

Sven Helmer: Book Review: "Recent issues on fuzzy databases" by G. Bordogna and G. Pasi (Eds.); Physica Verlag, Wurzburg, 2000, 236pp., ISBN: 3-7908-1319-2. Fuzzy Sets and Systems 140(1): 229-230 (2003)

Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: XML-Datenbanksysteme und ihre Anwendung. it - Information Technology 45(3): 137-142 (2003)

Sven Helmer, Guido Moerkotte: A performance study of four index structures for set-valued attributes of low cardinality. VLDB J. 12(3): 244-261 (2003)

Sven Helmer, Guido Moerkotte: Indexstrukturen für XML. Web & Datenbanken 2003: 217-250

Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Lock-based Protocols for Cooperation on XML Documents. DEXA Workshops 2003: 230-234

Sven Helmer, Thomas Neumann, Guido Moerkotte: A Robust Scheme for Multilevel Extendible Hashing. ISCIS 2003: 220-227

Sven Helmer, Thomas Neumann, Guido Moerkotte: Estimating the Output Cardinality of Partial Preaggregation with a Measure of Clusteredness. VLDB 2003: 656-667

Norman May, Sven Helmer, Guido Moerkotte: Quantifiers in XQuery. WISE 2003: 313-316

Norman May, Sven Helmer, Guido Moerkotte: Three Cases for Query Decorrelation in XQuery. Xsym 2003: 70-84

Thorsten Fiebig, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte, Julia Neumann, Robert Schiele, Till Westmann: Anatomy of a native XML base management system. VLDB J. 11(4): 292-314 (2002)

Thorsten Fiebig, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte, Julia Neumann, Robert Schiele, Till Westmann: Natix: A Technology Overview. Web, Web-Services, and Database Systems 2002: 12-33

Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Optimized Translation of XPath into Algebraic Expressions Parameterized by Programs Containing Navigational Primitives. WISE 2002: 215-224

Till Westmann, Donald Kossmann, Sven Helmer, Guido Moerkotte: The Implementation and Performance of Compressed Databases. SIGMOD Record 29(3): 55-67 (2000)

Sven Helmer, Till Westmann, Guido Moerkotte: Diag-Join: An Opportunistic Join Algorithm for 1:N Relationships. VLDB 1998: 98-109

Sven Helmer, Guido Moerkotte: Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates. VLDB 1997: 386-395