:: Conferences/Journals/Book Chapters

:: 2005

• Aleksei Pavlov, Sven Helmer, Guido Moerkotte: A Model-Based Monitoring and Diagnosis System for a Space-Based Astrometry Mission. Proc. 16th Int. Conf. on Database and Expert Systems Applications (DEXA), Copenhagen, August 2005: 920-929


• Thomas Neumann, Sven Helmer, Guido Moerkotte: On the Optimal Ordering of Maps and Selections under Factorization. Proc. 21st Int. Conf. on Data Engineering (ICDE), Tokyo, April 2005: 490-501


• Matthias Brantner, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Full-fledged Algebraic XPath Processing in Natix. Proc. 21st Int. Conf. on Data Engineering (ICDE), Tokyo, April 2005: 705-716

:: 2004

• Sven Helmer: Index Structures for Fuzzy Object-Oriented Database Systems. in Advances in Fuzzy Object-Oriented Databases (edited by Zongmin Ma), Idea Group Publishing, Hershey, 2004: 206-240


• Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Timestamp-based Protocols for Synchronizing Access on XML Documents. Proc. 15th Int. Conf. on Database and Expert Systems Applications (DEXA), Zaragoza, August/September 2004: 591-600


• Vasco Amaral, Sven Helmer, Guido Moerkotte: Engineering a New Abstraction Layer to Optimize the HEP Analysis Process IEEE Transactions on Nuclear Science, Vol. 51, No. 4, August 2004:1441-1448


• Vasco Amaral, Sven Helmer, Guido Moerkotte: A PHysicist's EAsy ANalysis Tool. Proc. 6th Int. Conf. On Flexible Query Answering Systems (FQAS), Lyon, June 2004: 229-242


• Norman May, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: XQuery Processing in Natix with an Emphasis on Join Ordering. Proc. 1st Int. Workshop on XQuery Implementation, Experience, and Perspectives (XIME-P), Paris, June 2004: 49-54


• Norman May, Sven Helmer, Guido Moerkotte: Nested Queries and Quantifiers in an Ordered Context. Proc. 20th Int. Conf. on Data Engineering (ICDE), Boston, March/April 2004: 239-250


• Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Evaluating Lock-based Protocols for Cooperation on XML Documents. SIGMOD Record, Vol. 33, No. 1, March 2004: 58-63

:: 2003

• Norman May, Sven Helmer, Guido Moerkotte: Quantifiers in XQuery. Proc. 4th Int. Conf. on Web Information Systems Engineering (WISE), Rome, 2003: 313-316


• Sven Helmer: Evaluating Different Approaches for Indexing Fuzzy Sets. Fuzzy Sets and Systems, Vol. 140, No. 1, November 2003: 167-182


• Sven Helmer, Thomas Neumann, Guido Moerkotte: A Robust Scheme for Multilevel Extendible Hashing. Proc. 18th Int. Sym. on Computer and Information Sciences (ISCIS), Antalya, 2003: 220-227


• Vasco Amaral, Sven Helmer, Guido Moerkotte: A Domain Specific Visual Query Language for High Energy Physicists. Proc. 3rd OOPSLA Workshop on Domain-Specific Modeling (DSM), Anaheim, 2003: 9-16


• Vasco Amaral, Sven Helmer, Guido Moerkotte: A Visual Query Language for HEP Analysis. Proc. of the Nuclear Science Symposium (NSS'03) Portland, 2003


• Vasco Amaral, Sven Helmer, Guido Moerkotte: Engineering a New Abstraction Layer to Optimize the HEP Analysis Process. Proc. of the Nuclear Science Symposium (NSS'03) Portland, 2003


• Sven Helmer, Guido Moerkotte A Performance Study of Four Index Structures for Set-valued Attributes of Low Cardinality VLDB Journal, Vol. 12, No. 3, October 2003: 244-261


• Sven Helmer, Thomas Neumann, Guido Moerkotte: Estimating the Output Cardinality of Partial Preaggregation with a Measure of Clusteredness. Proc. 29th Int. Conf. on Very Large Data Bases (VLDB), Berlin, 2003: 656-667


• Norman May, Sven Helmer, Guido Moerkotte: Three Cases for Query Decorrelation in XQuery. 1st Int. XML Database Symposium (XSYM), Berlin, September 2003: 70-84


• Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Lock-based Protocols for Cooperation on XML Documents. Proc. 14th Int. Workshop on Database and Expert Systems Applications (at DEXA Conf.), Prague, September 2003: 230-234


• Sven Helmer, Carl-Christian Kanne, Guido Moerkotte XML-Datenbanken und ihre Anwendung. Information Technology, Vol. 45, No. 3, June 2003: 137-142

:: 2002

• Thorsten Fiebig, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte, Julia Neumann, Robert Schiele, Till Westmann: Anatomy of a Native XML Base Management System. VLDB Journal, Vol. 11, No. 4, December 2002: 292-314


• Sven Helmer, Carl-Christian Kanne, Guido Moerkotte: Optimized Translation of XPath into Algebraic Expressions Parameterized by Programs Containing Navigational Primitives. Proc. 3rd Int. Conf. on Web Information Systems Engineering (WISE), Singapore, 2002: 215-224


• Thorsten Fiebig, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte, Julia Neumann, Robert Schiele, Till Westmann: Natix: A Technology Overview. Proceedings of NODe 2002 Web- and Database-Related Workshops, Erfurt, October 2002: 12-33


• Sven Helmer, Guido Moerkotte: Indexstrukturen für XML in Web & Datenbanken (edited by Erhard Rahm, Gottfried Vossen), dpunkt Verlag, Heidelberg, 2002: 217-250

:: 2001

• Vasco Amaral, Guido Moerkotte, Antonio Amorim, Sven Helmer: Studies for Optimisation of Data Analysis Queries for HEP Using HERA-B Commissioning Data. Int. Conf. on Computing in High Energy and Nuclear Physics (CHEP), Beijing, 2001: 154-155


• Sven Helmer: Indexing Fuzzy Data. Proc. Joint 9th IFSA World Congress and 20th NAFIPS Int. Conf., Vancouver, 2001: 2120-2125

:: 2000

• Till Westmann, Donald Kossmann, Sven Helmer, Guido Moerkotte: The Implementation and Performance of Compressed Databases. SIGMOD Record, Vol. 29, No. 3, September 2000: 55-67

:: 1999

• Birgit Boss, Sven Helmer: Index Structures for Efficiently Accessing Fuzzy Data Including Cost Models and Measurements. Fuzzy Sets and Systems, Vol. 108, No. 1, November 1999: 11-37

:: 1998

• Sven Helmer, Till Westmann, Guido Moerkotte: Diag-Join: An Opportunistic Join Algorithm for 1:N Relationships. Proc. 24th Int. Conf. on Very Large Data Bases (VLDB), New York, 1998: 98-109

:: 1997

• Sven Helmer, Guido Moerkotte: Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates. Proc. 23rd Int. Conf. on Very Large Data Bases (VLDB), Athens, 1997: 386-395