2020

• Dennis Heinrich, Stefan Werner, Christopher Blochwitz, Thilo Pionteck, Sven Groppe: Hardware-aided update acceleration in a hybrid Semantic Web database system
  in: The Journal of Supercomputing, 2020, Vol.76, (10), p.7961-7984
  

2018

• Christopher Blochwitz, Julian Wolff, Mladen Berekovic, Dennis Heinrich, Sven Groppe, Jan Moritz Joseph, Thilo Pionteck: Hardware-Accelerated Index Construction for Semantic Web
  in: International Conference on Field-Programmable Technology (FPT), Naha, Okinawa, Japan, 2018
  

2017

• Dennis Heinrich, Stefan Werner, Christopher Blochwitz, Thilo Pionteck, Sven Groppe: Search & Update Optimization of a B+ Tree in a Hardware aided Semantic Web Database System
  in: Proceedings of the 7th International Conference on Emerging Databases (EDB), 2017, Springer, Lecture Notes in Electrical Engineering (LNEE), Vol.461, Runner-Up Paper Award, p.172-182
  
• Stefan Werner, Dennis Heinrich, Thilo Pionteck, Sven Groppe: Semi-static operator graphs for accelerated query execution on FPGAs
  in: Microprocessors and Microsystems, 2017, Vol.53, p.178 - 189
  
• Christopher Blochwitz, Julian Wolff, Jan Moritz Joseph, Stefan Werner, Dennis Heinrich, Sven Groppe, Thilo Pionteck: Hardware-Accelerated Radix-Tree Based String Sorting for Big Data Applications
  in: Architecture of Computing Systems (ARCS 2017) - 30th International Conference, 2017, 3.-6. April, Vienna, Austria, LNCS, Vol.10172, p.47-58
  

2016

• Sven Groppe, Dennis Heinrich, Christopher Blochwitz, Thilo Pionteck: Constructing Large-Scale Semantic Web Indices for the Six RDF Collation Orders
  in: Open Journal of Big Data (OJBD), 2016, Vol.2, (1), p.11-25, ISSN 2365-029X
  
• Stefan Werner, Dennis Heinrich, Sven Groppe, Christopher Blochwitz, Thilo Pionteck: Runtime Adaptive Hybrid Query Engine based on FPGAs
  in: Open Journal of Databases (OJDB), 2016, Vol.3, (1), p.21-41
  

2015

• Sven Groppe, Dennis Heinrich, Stefan Werner: Distributed Join Approaches for W3C-Conform SPARQL Endpoints
  in: Open Journal of Semantic Web (OJSW), 2015, Vol.2, (1), p.30-52
  :

  @Article{OJSW_2015v2i1n04_Groppe,
          title     = {Distributed Join Approaches for W3C-Conform SPARQL Endpoints},
          author    = {Sven Groppe and Dennis Heinrich and Stefan Werner},
          journal   = {Open Journal of Semantic Web (OJSW)},
          issn      = {2199-336X},
          year      = {2015},
          volume    = {2},
          number    = {1},
          pages     = {30--52},
          url       = {http://www.ronpub.com/publications/OJSW_2015v2i1n04_Groppe.pdf},
          publisher = {RonPub},
          bibsource = {RonPub},
          abstract = {Currently many SPARQL endpoints are freely available and accessible without any costs to users: Everyone can submit SPARQL queries to SPARQL endpoints via a standardized protocol, where the queries are processed on the datasets of the SPARQL endpoints and the query results are sent back to the user in a standardized format. As these distributed execution environments for semantic big data (as intersection of semantic data and big data) are freely accessible, the Semantic Web is an ideal playground for big data research. However, when utilizing these distributed execution environments, questions about the performance arise. Especially when several datasets (locally and those residing in SPARQL endpoints) need to be combined, distributed joins need to be computed. In this work we give an overview of the various possibilities of distributed join processing in SPARQL endpoints, which follow the SPARQL specification and hence are "W3C conform". We also introduce new distributed join approaches as variants of the Bitvector-Join and combination of the Semi- and Bitvector-Join. Finally we compare all the existing and newly proposed distributed join approaches for W3C conform SPARQL endpoints in an extensive experimental evaluation.}
      }

• Christopher Blochwitz, Jan Moritz Joseph, Thilo Pionteck, Rico Backasch, Stefan Werner, Dennis Heinrich, Sven Groppe: An optimized Radix-Tree for hardware-accelerated index generation for Semantic Web Databases
  in: International Conference on ReConFigurable Computing and FPGAs (ReConFig), 2015, December 7 - 9, Cancun, Mexico
  
• Sven Groppe, Dennis Heinrich, Stefan Werner, Christopher Blochwitz, Thilo Pionteck: PatTrieSort - External String Sorting based on Patricia Tries
  in: Open Journal of Databases (OJDB), 2015, Vol.2, (1), p.36-50
  
• Stefan Werner, Dennis Heinrich, Jannik Piper, Sven Groppe, Rico Backasch, Christopher Blochwitz, Thilo Pionteck: Automated Composition and Execution of Hardware-accelerated Operator Graphs
  in: Proceedings of the 10th International Symposium on Reconfigurable Communication-centric Systems-on-Chip (ReCoSoC 2015), 2015, June 29 - July 1, IEEE, Bremen, Germany
  
• Dennis Heinrich, Stefan Werner, Marc Stelzner, Christopher Blochwitz, Thilo Pionteck, Sven Groppe: Hybrid FPGA Approach for a B+ Tree in a Semantic Web Database System
  in: Proceedings of the 10th International Symposium on Reconfigurable Communication-centric Systems-on-Chip (ReCoSoC 2015), 2015, June 29 - July 1, IEEE, Bremen, Germany
  
• Stefan Werner, Dennis Heinrich, Marc Stelzner, Volker Linnemann, Thilo Pionteck, Sven Groppe: Accelerated join evaluation in Semantic Web databases by using FPGAs
  in: Concurrency and Computation: Practice and Experience, 2015, May 18, Vol.28, (7), p.2031-2051
  

2014

• Sven Groppe, Johannes Blume, Dennis Heinrich, Stefan Werner: A Self-Optimizing Cloud Computing System for Distributed Storage and Processing of Semantic Web Data
  in: Open Journal of Cloud Computing (OJCC), 2014, Vol.1, (2), p.1-14
  
• Sven Groppe, Thomas Kiencke, Stefan Werner, Dennis Heinrich, Marc Stelzner, Le Gruenwald: P-LUPOSDATE: Using Precomputed Bloom Filters to Speed Up SPARQL Processing in the Cloud
  in: Open Journal of Semantic Web (OJSW), 2014, Vol.1, (2), p.25-55
  
• Stefan Werner, Dennis Heinrich, Marc Stelzner, Sven Groppe, Rico Backasch, Thilo Pionteck: Parallel and Pipelined Filter Operator for Hardware-Accelerated Operator Graphs in Semantic Web Databases
  in: Proceedings of the 14th IEEE International Conference on Computer and Information Technology (CIT 2014), 2014, September 11 - 13, IEEE, Xi´an, China, Copyright: IEEE