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Sven Helmer

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affiliation: University of Zurich, Switzerland
affiliation (former): Free University of Bozen-Bolzano, Italy
affiliation (former): University of Mannheim, Germany

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2020 – today

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2024
[c64]
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Jamal Mohammed, Michael H. Böhlen, Sven Helmer:
Quantifying and Estimating the Predictability Upper Bound of Univariate Numeric Time Series. KDD 2024: 2236-2247
[c63]
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Sven Helmer, Peter T. Wood, Manuel Stuefer:
Optimism and Pessimism in Database Query Optimisation. ICSC 2024: 269-276
2023
[j27]
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AmirReza Alizade Nikoo, Michael H. Böhlen, Sven Helmer:
Correlation Joins over Time Series Data Streams Utilizing Complementary Dimension Reduction and Transformation. Proc. ACM Manag. Data 1(4): 235:1-235:26 (2023)
[j26]
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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer, Antoine Pietri, Stefano Zacchiroli:
Robust and scalable content-and-structure indexing. VLDB J. 32(4): 689-715 (2023)
[c62]
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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer, Marcel Reutegger:
Workload-Aware Contention-Management in Indexes for Hierarchical Data. BTW 2023: 71-92
2022
[j25]
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Qing Chen, Oded Lachish, Sven Helmer, Michael H. Böhlen:
Dynamic Spanning Trees for Connectivity Queries on Fully-dynamic Undirected Graphs. Proc. VLDB Endow. 15(11): 3263-3276 (2022)
[i11]
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  - journals/corr/abs-2207-06887
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Qing Chen, Oded Lachish, Sven Helmer, Michael H. Böhlen:
Dynamic Spanning Trees for Connectivity Queries on Fully-dynamic Undirected Graphs (Extended version). CoRR abs/2207.06887 (2022)
[i10]
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  - journals/corr/abs-2209-05126
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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer, Antoine Pietri, Stefano Zacchiroli:
Robust and Scalable Content-and-Structure Indexing (Extended Version). CoRR abs/2209.05126 (2022)
2021
[j24]
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Vuong M. Ngo, Sven Helmer, Nhien-An Le-Khac, M. Tahar Kechadi:
Structural textile pattern recognition and processing based on hypergraphs. Inf. Retr. J. 24(2): 137-173 (2021)
[j23]
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Danila Piatov, Sven Helmer, Anton Dignös, Fabio Persia:
Cache-efficient sweeping-based interval joins for extended Allen relation predicates. VLDB J. 30(3): 379-402 (2021)
[c61]
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Kevin Wellenzohn, Luka Popovic, Michael H. Böhlen, Sven Helmer:
Inserting Keys into the Robust Content-and-Structure (RCAS) Index. ADBIS 2021: 121-135
[c60]
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Vasiliki Arpatzoglou, Artemis Kardara, Alexandra Diehl, Barbara Flueckiger, Sven Helmer, Renato Pajarola:
DanceMoves: A Visual Analytics Tool for Dance Movement Analysis. EuroVis (Short Papers) 2021: 67-71
[i9]
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  - journals/corr/abs-2103-11271
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Vuong M. Ngo, Sven Helmer, Nhien-An Le-Khac, M. Tahar Kechadi:
Structural Textile Pattern Recognition and Processing Based on Hypergraphs. CoRR abs/2103.11271 (2021)
2020
[j22]
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Fabio Persia, Giovanni Pilato, Mouzhi Ge, Paolo Bolzoni, Daniela D'Auria, Sven Helmer:
Improving orienteering-based tourist trip planning with social sensing. Future Gener. Comput. Syst. 110: 931-945 (2020)
[j21]
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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer:
Dynamic Interleaving of Content and Structure for Robust Indexing of Semi-Structured Hierarchical Data. Proc. VLDB Endow. 13(10): 1641-1653 (2020)
[j20]
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Sven Helmer, David B. Blumenthal, Kathrin Paschen:
What is meaningful research and how should we measure it? Scientometrics 125(1): 153-169 (2020)
[j19]
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Matteo Nardini, Sven Helmer, Nabil El Ioini, Claus Pahl:
A Blockchain-based Decentralized Electronic Marketplace for Computing Resources. SN Comput. Sci. 1(5): 251 (2020)
[i8]
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  - journals/corr/abs-2006-05134
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Kevin Wellenzohn, Michael H. Böhlen, Sven Helmer:
Dynamic Interleaving of Content and Structure for Robust Indexing of Semi-Structured Hierarchical Data (Extended Version). CoRR abs/2006.05134 (2020)
[i7]
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  - journals/corr/abs-2008-12665
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Danila Piatov, Sven Helmer, Anton Dignös, Fabio Persia:
Cache-Efficient Sweeping-Based Interval Joins for Extended Allen Relation Predicates (Extended Version). CoRR abs/2008.12665 (2020)

2010 – 2019

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2019
[j18]
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Danila Piatov, Sven Helmer, Anton Dignös, Johann Gamper:
Interactive and space-efficient multi-dimensional time series subsequence matching. Inf. Syst. 82: 121-135 (2019)
[j17]
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Claus Pahl, Nabil El Ioini, Sven Helmer, Brian Lee:
A semantic pattern for trusted orchestration in IoT edge clouds. Internet Technol. Lett. 2(3) (2019)
[c59]
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Fabio Persia, Sven Helmer:
High-Level Automatic Event Detection and User Classification in a Social Network Context. GraMSec@CSF 2019: 203-219
[c58]
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Daniela D'Auria, Fabio Persia, Fabio Bettini, Sven Helmer:
Predicting and Preventing Dangerous Events via Video Surveillance Using a Robotic Platform. IRC 2019: 549-554
[c57]
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Fabio Persia, Sven Helmer, Sergejs Pugacs, Giovanni Pilato:
Social Sensing for Improving the User Experience in Orienteering. ICSC 2019: 239-246
[p2]
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David von Leon, Lorenzo Miori, Julian Sanin, Nabil El Ioini, Sven Helmer, Claus Pahl:
A Lightweight Container Middleware for Edge Cloud Architectures. Fog and Edge Computing 2019: 145-170
2018
[c56]
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Sven Helmer, Matteo Roggia, Nabil El Ioini, Claus Pahl:
EthernityDB - Integrating Database Functionality into a Blockchain. ADBIS (Short Papers and Workshops) 2018: 37-44
[c55]
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Claus Pahl, Nabil El Ioini, Sven Helmer, Brian Lee:
An architecture pattern for trusted orchestration in IoT edge clouds. FMEC 2018: 63-70
[c54]
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David von Leon, Lorenzo Miori, Julian Sanin, Nabil El Ioini, Sven Helmer, Claus Pahl:
A Performance Exploration of Architectural Options for a Middleware for Decentralised Lightweight Edge Cloud Architectures. IoTBDS 2018: 73-84
[c53]
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Claus Pahl, Nabil El Ioini, Sven Helmer:
A Decision Framework for Blockchain Platforms for IoT and Edge Computing. IoTBDS 2018: 105-113
[c52]
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Daniela D'Auria, Fabio Persia, Fabio Bettini, Sven Helmer, Bruno Siciliano:
SARRI: A SmArt Rapiro Robot Integrating a Framework for Automatic High-Level Surveillance Event Detection. IRC 2018: 238-241
[c51]
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Fabio Persia, Sven Helmer:
A Framework for High-Level Event Detection in a Social Network Context Via an Extension of ISEQL. ICSC 2018: 140-147
[c50]
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Sven Helmer:
May I Have Your Attention, Please: - Building a Dystopian Attention Economy. WWW (Companion Volume) 2018: 1529-1533
[i6]
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  - journals/corr/abs-1810-04604
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Sven Helmer, Vuong M. Ngo:
A Similarity Measure for Weaving Patterns in Textiles. CoRR abs/1810.04604 (2018)
2017
[c49]
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Danila Piatov, Sven Helmer, Johann Gamper:
Interactive Time Series Subsequence Matching. ADBIS 2017: 73-87
[c48]
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Lorenzo Miori, Julian Sanin, Sven Helmer:
A Platform for Edge Computing Based on Raspberry Pi Clusters. BICOD 2017: 153-159
[c47]
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Fabio Persia, Fabio Bettini, Sven Helmer:
An Interactive Framework for Video Surveillance Event Detection and Modeling. CIKM 2017: 2515-2518
[c46]
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Paolo Bolzoni, Fabio Persia, Sven Helmer:
Itinerary Planning with Category Constraints Using a Probabilistic Approach. DEXA (2) 2017: 363-377
[c45]
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Sergejs Pugacs, Sven Helmer, Markus Zanker:
A Framework for Comparing Interactive Route Planning Apps in Tourism. EnCHIReS@EICS 2017: 18-25
[c44]
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Sven Helmer, Gerhard Glüher, Christian Upmeier:
Show, Don't Tell: Retrieving Cultural Assets via Gestures. JOWO 2017
[c43]
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Fabio Persia, Fabio Bettini, Sven Helmer:
Labeling the Frames of a Video Stream with Interval Events. ICSC 2017: 204-211
[c42]
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Paolo Bolzoni, Sven Helmer:
Hybrid Best-First Greedy Search for Orienteering with Category Constraints. SSTD 2017: 24-42
[c41]
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Danila Piatov, Sven Helmer:
Sweeping-Based Temporal Aggregation. SSTD 2017: 125-144
[i5]
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Paolo Bolzoni, Sven Helmer:
Solving Orienteering with Category Constraints Using Prioritized Search. CoRR abs/1702.04304 (2017)
[i4]
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  - journals/corr/abs-1709-06815
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Pekka Abrahamsson, Sven Helmer, Nattakarn Phaphoom, Lorenzo Nicolodi, Nick Preda, Lorenzo Miori, Matteo Angriman, Juha Rikkilä, Xiaofeng Wang, Karim Hamily, Sara Bugoloni:
Affordable and Energy-Efficient Cloud Computing Clusters: The Bolzano Raspberry Pi Cloud Cluster Experiment. CoRR abs/1709.06815 (2017)
[i3]
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  - journals/corr/abs-1712-00606
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Nattakarn Phaphoom, Xiaofeng Wang, Sarah Samuel, Sven Helmer, Pekka Abrahamsson:
A survey study on major technical barriers affecting the decision to adopt cloud services. CoRR abs/1712.00606 (2017)
2016
[j16]
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Sven Helmer, Fabio Persia:
ISEQL, an Interval-based Surveillance Event Query Language. Int. J. Multim. Data Eng. Manag. 7(4): 1-21 (2016)
[c40]
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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, Pekka Abrahamsson, Tosin Daniel Oyetoyan:
Bringing the Cloud to Rural and Remote Areas via Cloudlets. ACM DEV 2016: 14:1-14:10
[c39]
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Claus Pahl, Sven Helmer, Lorenzo Miori, Julian Sanin, Brian Lee:
A Container-Based Edge Cloud PaaS Architecture Based on Raspberry Pi Clusters. FiCloud Workshops 2016: 117-124
[c38]
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Danila Piatov, Sven Helmer, Anton Dignös:
An interval join optimized for modern hardware. ICDE 2016: 1098-1109
[c37]
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  - conf/iri/PersiaH16
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Fabio Persia, Sven Helmer:
An Event Detection Framework Supported by a Smart Graphical User Interface. IRI 2016: 490-495
[c36]
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Sven Helmer, Fabio Persia:
An Interval-based Query Language for High-level Surveillance Event Detection. SEBD 2016: 126-133
[c35]
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Sven Helmer, Fabio Persia:
High-Level Surveillance Event Detection Using an Interval-Based Query Language. ICSC 2016: 39-46
[c34]
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Anja Kunkel, Astrid Rheinländer, Christopher Schiefer, Sven Helmer, Panagiotis Bouros, Ulf Leser:
PIEJoin: Towards Parallel Set Containment Joins. SSDBM 2016: 11:1-11:12
[i2]
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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:
Bringing the Cloud to Rural and Remote Areas - Cloudlet by Cloudlet. CoRR abs/1605.03622 (2016)
2015
[j15]
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Richard Brownlow, Stefano Capuzzi, Sven Helmer, Luciana Martins, Immanuel Normann, Alexandra Poulovassilis:
An Ontological Approach to Creating an Andean Weaving Knowledge Base. ACM Journal on Computing and Cultural Heritage 8(2): 11:1-11:31 (2015)
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Nattakarn Phaphoom, Xiaofeng Wang, Sarah Samuel, Sven Helmer, Pekka Abrahamsson:
A survey study on major technical barriers affecting the decision to adopt cloud services. J. Syst. Softw. 103: 167-181 (2015)
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Khaled Hamed Alyoubi, Sven Helmer, Peter T. Wood:
Ordering Selection Operators Under Partial Ignorance. CIKM 2015: 1521-1530
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Sven Helmer, Vuong Minh Ngo:
A Similarity Measure for Weaving Patterns in Textiles. SIGIR 2015: 163-172
[i1]
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Khaled Hamed Alyoubi, Sven Helmer, Peter T. Wood:
Ordering Selection Operators Using the Minmax Regret Rule. CoRR abs/1507.08257 (2015)
2014
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Paolo Bolzoni, Sven Helmer, Kevin Wellenzohn, Johann Gamper, Periklis Andritsos:
Efficient itinerary planning with category constraints. SIGSPATIAL/GIS 2014: 203-212
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Mohammad Tareq Jaber, Panagiotis Papapetrou, Sven Helmer, Peter T. Wood:
Using Time-Sensitive Rooted PageRank to Detect Hierarchical Social Relationships. IDA 2014: 143-154
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Mohammad Tareq Jaber, Peter T. Wood, Panagiotis Papapetrou, Sven Helmer:
Inferring offline hierarchical ties from online social networks. WWW (Companion Volume) 2014: 1261-1266
2013
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Pekka Abrahamsson, Sven Helmer, Nattakarn Phaphoom, Lorenzo Nicolodi, Nick Preda, Lorenzo Miori, Matteo Angriman, Juha Rikkilä, Xiaofeng Wang, Karim Hamily, Sara Bugoloni:
Affordable and Energy-Efficient Cloud Computing Clusters: The Bolzano Raspberry Pi Cloud Cluster Experiment. CloudCom (2) 2013: 170-175
2012
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Carlos D. Barranco, Sven Helmer:
An impact ordering approach for indexing fuzzy sets. Fuzzy Sets Syst. 196: 33-46 (2012)
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Georgia Garani, Sven Helmer:
Integrating Star and Snowflake Schemas in Data Warehouses. Int. J. Data Warehous. Min. 8(4): 22-40 (2012)
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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)
2011
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Andrew McDonald, Sven Helmer:
A Comparative Case Study of Indonesian and UK Organisational Culture Differences in IS Project Management. Int. J. Technol. Hum. Interact. 7(2): 28-37 (2011)

2000 – 2009

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2009
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Denise Y. Arnold, Sven Helmer, Rodolfo Velásquez Arando:
Towards Building a Knowledge Base for Research on Andean Weaving. BNCOD 2009: 180-188
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Tadeusz Litak, Sven Helmer:
On the Termination Problem for Declarative XML Message Processing. DEXA 2009: 83-97
[c25]
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Carlos D. Barranco, Sven Helmer:
Increasing the Performance of Fuzzy Retrieval Using Impact Ordering. IFSA/EUSFLAT Conf. 2009: 957-962
2008
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Alexandre Guitton, Niki Trigoni, Sven Helmer:
Fault-Tolerant Compression Algorithms for Delay-Sensitive Sensor Networks with Unreliable Links. DCOSS 2008: 190-203
2007
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Sven Helmer, Robin Aly, Thomas Neumann, Guido Moerkotte:
Indexing Set-Valued Attributes with a Multi-level Extendible Hashing Scheme. DEXA 2007: 98-108
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Sven Helmer:
An Interval-Based Index Structure for Structure Elucidation in Chemical Databases. IFSA (1) 2007: 625-634
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Sven Helmer:
Measuring the Structural Similarity of Semistructured Documents Using Entropy. VLDB 2007: 1022-1032
2006
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Norman May, Sven Helmer, Guido Moerkotte:
Strategies for query unnesting in XML databases. ACM Trans. Database Syst. 31(3): 968-1013 (2006)
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Thomas Neumann, Sven Helmer, Guido Moerkotte:
On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. BNCOD 2006: 115-126
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Matthias Brantner, Carl-Christian Kanne, Guido Moerkotte, Sven Helmer:
Algebraic Optimization of Nested XPath Expressions. ICDE 2006: 128
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Matthias Brantner, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Kappa-Join: Efficient Execution of Existential Quantification in XML Query Languages. XSym 2006: 1-15
2005
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Aleksei Pavlov, Sven Helmer, Guido Moerkotte:
A Model-Based Monitoring and Diagnosis System for a Space-Based Astrometry Mission. DEXA 2005: 920-929
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Thomas Neumann, Sven Helmer, Guido Moerkotte:
On the Optimal Ordering of Maps and Selections under Factorization. ICDE 2005: 490-501
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Matthias Brantner, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Full-fledged Algebraic XPath Processing in Natix. ICDE 2005: 705-716
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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
2004
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Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Evaluating lock-based protocols for cooperation on XML documents. SIGMOD Rec. 33(1): 58-63 (2004)
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Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Timestamp-Based Protocols for Synchronizing Access on XML Documents. DEXA 2004: 591-600
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Vasco Amaral, Sven Helmer, Guido Moerkotte:
PHEASANT: A PHysicist's EAsy ANalysis Tool. FQAS 2004: 229-242
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Norman May, Sven Helmer, Guido Moerkotte:
Nested Queries and Quantifiers in an Ordered Context. ICDE 2004: 239-250
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Norman May, Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
XQuery Processing in Natix with an Emphasis on Join Ordering. XIME-P 2004: 49-54
2003
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Sven Helmer:
Evaluating different approaches for indexing fuzzy sets. Fuzzy Sets Syst. 140(1): 167-182 (2003)
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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 Syst. 140(1): 229-230 (2003)
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Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
XML-Datenbanksysteme und ihre Anwendung. it Inf. Technol. 45(3): 137-142 (2003)
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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)
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Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Lock-based Protocols for Cooperation on XML Documents. DEXA Workshops 2003: 230-234
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Sven Helmer, Thomas Neumann, Guido Moerkotte:
A Robust Scheme for Multilevel Extendible Hashing. ISCIS 2003: 220-227
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Sven Helmer, Thomas Neumann, Guido Moerkotte:
Estimating the Output Cardinality of Partial Preaggregation with a Measure of Clusteredness. VLDB 2003: 656-667
[c6]
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Norman May, Sven Helmer, Guido Moerkotte:
Quantifiers in XQuery. WISE 2003: 313-316
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Norman May, Sven Helmer, Guido Moerkotte:
Three Cases for Query Decorrelation in XQuery. Xsym 2003: 70-84
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Sven Helmer, Guido Moerkotte:
Indexstrukturen für XML. Web & Datenbanken 2003: 217-250
2002
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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)
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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
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Sven Helmer, Carl-Christian Kanne, Guido Moerkotte:
Optimized Translation of XPath into Algebraic Expressions Parameterized by Programs Containing Navigational Primitives. WISE 2002: 215-224
2000
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Sven Helmer:
Performance enhancements for advanced database management systems. University of Mannheim, Germany, 2000, pp. 1-147
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Till Westmann, Donald Kossmann, Sven Helmer, Guido Moerkotte:
The Implementation and Performance of Compressed Databases. SIGMOD Rec. 29(3): 55-67 (2000)

1990 – 1999

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1999
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Birgit Boss, Sven Helmer:
Index structures for efficiently accessing fuzzy data including cost models and measurements. Fuzzy Sets Syst. 108(1): 11-37 (1999)
1998
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Sven Helmer, Till Westmann, Guido Moerkotte:
Diag-Join: An Opportunistic Join Algorithm for 1:N Relationships. VLDB 1998: 98-109
1997
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Sven Helmer, Guido Moerkotte:
Evaluation of Main Memory Join Algorithms for Joins with Set Comparison Join Predicates. VLDB 1997: 386-395

Coauthor Index

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