Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates. - Sven Helmer; Guido Moerkotte (VLDB, 1997)

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

Index structures for efficiently accessing fuzzy data including cost models and measurements. - Birgit Boss; Sven Helmer (Fuzzy Sets Syst., 1999)

The Implementation and Performance of Compressed Databases. - Till Westmann; Donald Kossmann; Sven Helmer; Guido Moerkotte (SIGMOD Rec., 2000)

Performance enhancements for advanced database management systems. - Sven Helmer (2000)

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

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

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

Indexstrukturen für XML. - Sven Helmer; Guido Moerkotte (Web & Datenbanken, 2003)

Lock-based Protocols for Cooperation on XML Documents. - Sven Helmer; Carl-Christian Kanne; Guido Moerkotte (DEXA Workshops, 2003)

A Robust Scheme for Multilevel Extendible Hashing. - Sven Helmer; Thomas Neumann 001; Guido Moerkotte (ISCIS, 2003)

Estimating the Output Cardinality of Partial Preaggregation with a Measure of Clusteredness. - Sven Helmer; Thomas Neumann 001; Guido Moerkotte (VLDB, 2003)

Quantifiers in XQuery. - Norman May; Sven Helmer; Guido Moerkotte (WISE, 2003)

Three Cases for Query Decorrelation in XQuery. - Norman May; Sven Helmer; Guido Moerkotte (Xsym, 2003)

Evaluating different approaches for indexing fuzzy sets. - Sven Helmer (Fuzzy Sets Syst., 2003)

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

XML-Datenbanksysteme und ihre Anwendung. - Sven Helmer; Carl-Christian Kanne; Guido Moerkotte (it Inf. Technol., 2003)

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

Timestamp-Based Protocols for Synchronizing Access on XML Documents. - Sven Helmer; Carl-Christian Kanne; Guido Moerkotte (DEXA, 2004)

PHEASANT: A PHysicist's EAsy ANalysis Tool. - Vasco Amaral 001; Sven Helmer; Guido Moerkotte (FQAS, 2004)

Nested Queries and Quantifiers in an Ordered Context. - Norman May; Sven Helmer; Guido Moerkotte (ICDE, 2004)

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

Evaluating lock-based protocols for cooperation on XML documents. - Sven Helmer; Carl-Christian Kanne; Guido Moerkotte (SIGMOD Rec., 2004)

A Model-Based Monitoring and Diagnosis System for a Space-Based Astrometry Mission. - Aleksei Pavlov; Sven Helmer; Guido Moerkotte (DEXA, 2005)

Full-fledged Algebraic XPath Processing in Natix. - Matthias Brantner; Sven Helmer; Carl-Christian Kanne; Guido Moerkotte (ICDE, 2005)

On the Optimal Ordering of Maps and Selections under Factorization. - Thomas Neumann 001; Sven Helmer; Guido Moerkotte (ICDE, 2005)

Formally Specifying the Syntax and Semantics of a Visual Query Language for the Domain of High Energy Physics Data Analysis. - Vasco Amaral 001; Sven Helmer; Guido Moerkotte (VL/HCC, 2005)

On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. - Thomas Neumann 001; Sven Helmer; Guido Moerkotte (BNCOD, 2006)

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

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

Strategies for query unnesting in XML databases. - Norman May; Sven Helmer; Guido Moerkotte (ACM Trans. Database Syst., 2006)

Indexing Set-Valued Attributes with a Multi-level Extendible Hashing Scheme. - Sven Helmer; Robin Aly; Thomas Neumann 001; Guido Moerkotte (DEXA, 2007)

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

Measuring the Structural Similarity of Semistructured Documents Using Entropy. - Sven Helmer (VLDB, 2007)

Fault-Tolerant Compression Algorithms for Delay-Sensitive Sensor Networks with Unreliable Links. - Alexandre Guitton; Niki Trigoni; Sven Helmer (DCOSS, 2008)

Towards Building a Knowledge Base for Research on Andean Weaving. - Denise Y. Arnold; Sven Helmer; Rodolfo Velásquez Arando (BNCOD, 2009)

On the Termination Problem for Declarative XML Message Processing. - Tadeusz Litak; Sven Helmer (DEXA, 2009)

Increasing the Performance of Fuzzy Retrieval Using Impact Ordering. - Carlos D. Barranco; Sven Helmer (IFSA/EUSFLAT Conf., 2009)

A Comparative Case Study of Indonesian and UK Organisational Culture Differences in IS Project Management. - Andrew McDonald 002; Sven Helmer (Int. J. Technol. Hum. Interact., 2011)

An impact ordering approach for indexing fuzzy sets. - Carlos D. Barranco; Sven Helmer (Fuzzy Sets Syst., 2012)

Integrating Star and Snowflake Schemas in Data Warehouses. - Georgia Garani; Sven Helmer (Int. J. Data Warehous. Min., 2012)

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

Affordable and Energy-Efficient Cloud Computing Clusters: The Bolzano Raspberry Pi Cloud Cluster Experiment. - Pekka Abrahamsson; Sven Helmer; Nattakarn Phaphoom; Lorenzo Nicolodi; Nick Preda; Lorenzo Miori; Matteo Angriman; Juha Rikkilä; Xiaofeng Wang 001; Karim Hamily; Sara Bugoloni (CloudCom (2), 2013)

Efficient itinerary planning with category constraints. - Paolo Bolzoni; Sven Helmer; Kevin Wellenzohn; Johann Gamper; Periklis Andritsos (SIGSPATIAL/GIS, 2014)

Using Time-Sensitive Rooted PageRank to Detect Hierarchical Social Relationships. - Mohammad Tareq Jaber; Panagiotis Papapetrou; Sven Helmer; Peter T. Wood (IDA, 2014)

Inferring offline hierarchical ties from online social networks. - Mohammad Tareq Jaber; Peter T. Wood; Panagiotis Papapetrou; Sven Helmer (WWW (Companion Volume), 2014)

Ordering Selection Operators Under Partial Ignorance. - Khaled Hamed Alyoubi; Sven Helmer; Peter T. Wood (CIKM, 2015)

A Similarity Measure for Weaving Patterns in Textiles. - Sven Helmer; Vuong Minh Ngo (SIGIR, 2015)

Ordering Selection Operators Using the Minmax Regret Rule. - Khaled Hamed Alyoubi; Sven Helmer; Peter T. Wood (CoRR, 2015)

An Ontological Approach to Creating an Andean Weaving Knowledge Base. - Richard Brownlow; Stefano Capuzzi; Sven Helmer; Luciana Martins; Immanuel Normann; Alexandra Poulovassilis (ACM Journal on Computing and Cultural Heritage, 2015)

A survey study on major technical barriers affecting the decision to adopt cloud services. - Nattakarn Phaphoom; Xiaofeng Wang 001; Sarah Samuel; Sven Helmer; Pekka Abrahamsson (J. Syst. Softw., 2015)

Bringing the Cloud to Rural and Remote Areas via Cloudlets. - Sven Helmer; Claus Pahl; Julian Sanin; Lorenzo Miori; Stefan Brocanelli; Filippo Cardano; Daniele Gadler; Daniel Morandini; Alessandro Piccoli; Saifur Salam; Alam Mahabub Sharear; Angelo Ventura; et al. (ACM DEV, 2016)

A Container-Based Edge Cloud PaaS Architecture Based on Raspberry Pi Clusters. - Claus Pahl; Sven Helmer; Lorenzo Miori; Julian Sanin; Brian Lee 001 (FiCloud Workshops, 2016)

An interval join optimized for modern hardware. - Danila Piatov; Sven Helmer; Anton Dignös (ICDE, 2016)

An Event Detection Framework Supported by a Smart Graphical User Interface. - Fabio Persia; Sven Helmer (IRI, 2016)

An Interval-based Query Language for High-level Surveillance Event Detection. - Sven Helmer; Fabio Persia (SEBD, 2016)

High-Level Surveillance Event Detection Using an Interval-Based Query Language. - Sven Helmer; Fabio Persia (ICSC, 2016)

PIEJoin: Towards Parallel Set Containment Joins. - Anja Kunkel; Astrid Rheinländer; Christopher Schiefer; Sven Helmer; Panagiotis Bouros; Ulf Leser (SSDBM, 2016)

Bringing the Cloud to Rural and Remote Areas - Cloudlet by Cloudlet. - Pekka Abrahamsson; Sven Helmer; Tosin Daniel Oyetoyan; Stefan Brocanelli; Filippo Cardano; Daniele Gadler; Daniel Morandini; Alessandro Piccoli; Saifur Salam; Julian Sanin; Alam Mahabub Shahrear; Angelo Ventura (CoRR, 2016)

ISEQL, an Interval-based Surveillance Event Query Language. - Sven Helmer; Fabio Persia (Int. J. Multim. Data Eng. Manag., 2016)

Interactive Time Series Subsequence Matching. - Danila Piatov; Sven Helmer; Johann Gamper (ADBIS, 2017)

A Platform for Edge Computing Based on Raspberry Pi Clusters. - Lorenzo Miori; Julian Sanin; Sven Helmer (BICOD, 2017)

An Interactive Framework for Video Surveillance Event Detection and Modeling. - Fabio Persia; Fabio Bettini; Sven Helmer (CIKM, 2017)

Itinerary Planning with Category Constraints Using a Probabilistic Approach. - Paolo Bolzoni; Fabio Persia; Sven Helmer (DEXA (2), 2017)

A Framework for Comparing Interactive Route Planning Apps in Tourism. - Sergejs Pugacs; Sven Helmer; Markus Zanker (EnCHIReS@EICS, 2017)

Show, Don't Tell: Retrieving Cultural Assets via Gestures. - Sven Helmer; Gerhard Glüher; Christian Upmeier (JOWO, 2017)

Labeling the Frames of a Video Stream with Interval Events. - Fabio Persia; Fabio Bettini; Sven Helmer (ICSC, 2017)

Hybrid Best-First Greedy Search for Orienteering with Category Constraints. - Paolo Bolzoni; Sven Helmer (SSTD, 2017)

Sweeping-Based Temporal Aggregation. - Danila Piatov; Sven Helmer (SSTD, 2017)

Solving Orienteering with Category Constraints Using Prioritized Search. - Paolo Bolzoni; Sven Helmer (CoRR, 2017)

EthernityDB - Integrating Database Functionality into a Blockchain. - Sven Helmer; Matteo Roggia; Nabil El Ioini; Claus Pahl (ADBIS (Short Papers and Workshops), 2018)

An architecture pattern for trusted orchestration in IoT edge clouds. - Claus Pahl; Nabil El Ioini; Sven Helmer; Brian Lee 001 (FMEC, 2018)

A Performance Exploration of Architectural Options for a Middleware for Decentralised Lightweight Edge Cloud Architectures. - David von Leon; Lorenzo Miori; Julian Sanin; Nabil El Ioini; Sven Helmer; Claus Pahl (IoTBDS, 2018)

A Decision Framework for Blockchain Platforms for IoT and Edge Computing. - Claus Pahl; Nabil El Ioini; Sven Helmer (IoTBDS, 2018)

SARRI: A SmArt Rapiro Robot Integrating a Framework for Automatic High-Level Surveillance Event Detection. - Daniela D'Auria; Fabio Persia; Fabio Bettini; Sven Helmer; Bruno Siciliano (IRC, 2018)

A Framework for High-Level Event Detection in a Social Network Context Via an Extension of ISEQL. - Fabio Persia; Sven Helmer (ICSC, 2018)

May I Have Your Attention, Please: - Building a Dystopian Attention Economy. - Sven Helmer (WWW (Companion Volume), 2018)

A Lightweight Container Middleware for Edge Cloud Architectures. - David von Leon; Lorenzo Miori; Julian Sanin; Nabil El Ioini; Sven Helmer; Claus Pahl (Fog and Edge Computing, 2019)

High-Level Automatic Event Detection and User Classification in a Social Network Context. - Fabio Persia; Sven Helmer (GraMSec@CSF, 2019)

Predicting and Preventing Dangerous Events via Video Surveillance Using a Robotic Platform. - Daniela D'Auria; Fabio Persia; Fabio Bettini; Sven Helmer (IRC, 2019)

Social Sensing for Improving the User Experience in Orienteering. - Fabio Persia; Sven Helmer; Sergejs Pugacs; Giovanni Pilato (ICSC, 2019)

Interactive and space-efficient multi-dimensional time series subsequence matching. - Danila Piatov; Sven Helmer; Anton Dignös; Johann Gamper (Inf. Syst., 2019)

A semantic pattern for trusted orchestration in IoT edge clouds. - Claus Pahl; Nabil El Ioini; Sven Helmer; Brian Lee 001 (Internet Technol. Lett., 2019)

Dynamic Interleaving of Content and Structure for Robust Indexing of Semi-Structured Hierarchical Data (Extended Version). - Kevin Wellenzohn; Michael H. Böhlen; Sven Helmer (CoRR, 2020)

Cache-Efficient Sweeping-Based Interval Joins for Extended Allen Relation Predicates (Extended Version). - Danila Piatov; Sven Helmer; Anton Dignös; Fabio Persia (CoRR, 2020)

Improving orienteering-based tourist trip planning with social sensing. - Fabio Persia; Giovanni Pilato; Mouzhi Ge; Paolo Bolzoni; Daniela D'Auria; Sven Helmer (Future Gener. Comput. Syst., 2020)

Dynamic Interleaving of Content and Structure for Robust Indexing of Semi-Structured Hierarchical Data. - Kevin Wellenzohn; Michael H. Böhlen; Sven Helmer (Proc. VLDB Endow., 2020)

What is meaningful research and how should we measure it? - Sven Helmer; David B. Blumenthal; Kathrin Paschen (Scientometrics, 2020)

A Blockchain-based Decentralized Electronic Marketplace for Computing Resources. - Matteo Nardini; Sven Helmer; Nabil El Ioini; Claus Pahl (SN Comput. Sci., 2020)

Inserting Keys into the Robust Content-and-Structure (RCAS) Index. - Kevin Wellenzohn; Luka Popovic; Michael H. Böhlen; Sven Helmer (ADBIS, 2021)

DanceMoves: A Visual Analytics Tool for Dance Movement Analysis. - Vasiliki Arpatzoglou; Artemis Kardara; Alexandra Diehl; Barbara Flueckiger; Sven Helmer; Renato Pajarola (EuroVis (Short Papers), 2021)

Structural textile pattern recognition and processing based on hypergraphs. - Vuong M. Ngo; Sven Helmer; Nhien-An Le-Khac; M. Tahar Kechadi (Inf. Retr. J., 2021)

Cache-efficient sweeping-based interval joins for extended Allen relation predicates. - Danila Piatov; Sven Helmer; Anton Dignös; Fabio Persia (VLDB J., 2021)

Dynamic Spanning Trees for Connectivity Queries on Fully-dynamic Undirected Graphs (Extended version). - Qing Chen 002; Oded Lachish; Sven Helmer; Michael H. Böhlen (CoRR, 2022)

Robust and Scalable Content-and-Structure Indexing (Extended Version). - Kevin Wellenzohn; Michael H. Böhlen; Sven Helmer; Antoine Pietri; Stefano Zacchiroli (CoRR, 2022)

Dynamic Spanning Trees for Connectivity Queries on Fully-dynamic Undirected Graphs. - Qing Chen 002; Oded Lachish; Sven Helmer; Michael H. Böhlen (Proc. VLDB Endow., 2022)

Workload-Aware Contention-Management in Indexes for Hierarchical Data. - Kevin Wellenzohn; Michael H. Böhlen; Sven Helmer; Marcel Reutegger (BTW, 2023)

Robust and scalable content-and-structure indexing. - Kevin Wellenzohn; Michael H. Böhlen; Sven Helmer; Antoine Pietri; Stefano Zacchiroli (VLDB J., 2023)

Correlation Joins over Time Series Data Streams Utilizing Complementary Dimension Reduction and Transformation. - AmirReza Alizade Nikoo; Michael H. Böhlen; Sven Helmer (Proc. ACM Manag. Data, 2023)

Quantifying and Estimating the Predictability Upper Bound of Univariate Numeric Time Series. - Jamal Mohammed; Michael H. Böhlen; Sven Helmer (KDD, 2024)

Optimism and Pessimism in Database Query Optimisation. - Sven Helmer; Peter T. Wood; Manuel Stuefer (ICSC, 2024)

Using the Hurwicz Criterion to Optimize Selection Queries Under Partial Ignorance. - Sven Helmer; Peter T. Wood; Manuel Stuefer (Int. J. Semantic Comput., 2025)

An experimental comparison of tree-data structures for connectivity queries on fully-dynamic undirected graphs (Extended Version). - Qing Chen 002; Michael H. Böhlen; Sven Helmer (CoRR, 2025)

An Experimental Comparison of Tree-data Structures for Connectivity Queries on Fully-dynamic Undirected Graphs. - Qing Chen 002; Michael H. Böhlen; Sven Helmer (Proc. ACM Manag. Data, 2025)