Publications
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Book Chapters
  1. Processing Big Data in Motion: Core Components and System Architectures with Applications to the Maritime Domain
    Nikos Giatrakos, Antonios Deligiannakis, Konstantina Bereta, Marios Vodas, Dimitris Zissis, Elias Alevizos, Charilaos Akasiadis, Alexander Artikis
    Technologies and Applications for Big Data Value, Pages 497-518, Springer
    ISBN 978-3-030-78307-5, 2022
Refereed Journal Publications
  1. And Synopses for All: a Synopses Data Engine for Extreme Scale Analytics-as-a-Service
    Antonios Kontaxakis, Nikos Giatrakos, Dimitris Sacharidis, Antonios Deligiannakis
    Information Systems, Volume 116, Issue C, 102221,
    June 2023

  2. Complex Event Recognition in the Big Data Era: A Survey (Also as VLDB'20 Poster)
    Nikos Giatrakos, Elias Alevizos, Alexander Artikis, Antonios Deligiannakis, Minos Garofalakis
    The VLDB Journal, Volume 29, Issue 1, Pages 313-352,
    January 2020

  3. Network-wide Complex Event Processing over Geographically Distributed Data Sources
    Ioannis Flouris, Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis
    Information Systems, Volume 88, 101442,
    February 2020

  4. Omnibus Outlier Detection in Sensor Networks using Windowed Locality Sensitive Hashing
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Yannis Kotidis
    Future Generation Computer Systems, Volume 110, Issue C, Pages 587-609,
    September 2020

  5. Interactive Extreme – Scale Analytics towards Battling Cancer
    Nikos Giatrakos, Nikos Katzouris, Antonios Deligiannakis, Alexander Artikis, Minos Garofalakis,
    George Paliouras, Holger Arndt, Raffaele Grasso, Ralf Klinkenberg, Miguel Ponce De Leon,
    Gian Gaetano Tartaglia, Alfonso Valencia and Dimitris Zissis
    IEEE Technology and Society Magazine, Volume 38, Issue 2, Pages 54-61,
    June 2019

  6. Scalable Approximate Query Tracking over Highly Distributed Data Streams with Tunable Accuracy Guarantees
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Daniel Keren, Vasilis Samoladas
    Information Systems, Volume 76, Pages 59-87,
    July 2018

  7. Issues in Complex Event Processing: Status and Prospects in the Big Data Era
    Ioannis Flouris, Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Michael Kamp, Michael Mock
    Journal of Systems and Software, Volume 127, Issue C, Pages 217-236,
    May 2017

  8. HERMES: A Trajectory DB Engine for Mobility-Centric Applications
    Nikos Pelekis, Elias Frentzos, Nikos Giatrakos, Yannis Theodoridis
    International Journal of Knowledge Based Organizations, Volume 5, Issue 2, Pages 19-41,
    April-June 2015

  9. Distributed Geometric Query Monitoring using Prediction Models
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Izchak Sharfman, Assaf Schuster
    ACM Transactions on Database Systems, Volume 39, Issue 2, Pages 16:1-16:42,
    May 2014

  10. On the Support of Mobility in ORDBMS
    Nikos Pelekis, Elias Frentzos, Nikos Giatrakos, Yannis Theodoridis
    International Journal of Knowledge Based Organizations, Volume 4, Issue 1, Pages 38-64,
    January-March 2014

  11. In - Network Approximate Computation of Outliers with Quality Guarantees
    Nikos Giatrakos, Yannis Kotidis, Antonios Deligiannakis, Vasilis Vassalos, Yannis Theodoridis
    Information Systems, Volume 38, Issue 8, Pages 1285-1308,
    November 2013

  12. Visual Mobility Analysis using T-Warehouse
    Alessandra Raffaeta, Luca Leonardi, Gerasimos Marketos, Gennady Andrienko, Natalia Andrienko, Elias Frentzos, Nikos Giatrakos, Salvatore Orlando, Nikos Pelekis, Alessandro Roncato, Claudio Silvestri
    International Journal of Data Warehousing and Mining , Volume 7, Issue 1, Pages 1-23,
    January 2011.
Refereed Conference & Workshop Publications
  1. Proactive Streaming Analytics at Scale: A Journey from the State-of-the-art to a Production Platform (Tutorial)
    Nikos Giatrakos, Elias Alevizos, Antonios Deligiannakis, Ralf Klinkenberg, Alexander Artikis
    In Proceedings of the 32nd ACM International Conference on Information and Knowledge Management (CIKM'23)
    Birmingham, UK, October 2023.

  2. Optimizing Resource Allocation for Tumor Simulations over HPC Infrastructures
    Errikos Streviniotis, Nikos Giatrakos, Yannis Kotidis, Thalia Ntiniakou, Miguel Ponce de Leon
    In Proceedings of the 10th IEEE International Conference on Data Science and Advanced Analytics (DSAA'23)
    Thessaloniki, Greece, October 2023.

  3. SSTRESED: Scalable Semantic Trajectory Extraction for Simple Event Detection over Streaming Movement Data (Extended Abstract) (Slides)
    Nikos Giatrakos
    In Proceedings of the 30th International Symposium on Temporal Representation and Reasoning (TIME'23)
    Athens, Greece, September 2023.

  4. Optimizing Complex Event Forecasting
    Vasileios Stavropoulos, Elias Alevizos, Nikos Giatrakos, Alexander Artikis
    In Proceedings of the 16th ACM International Conference on Distributed and Event-based Systems (DEBS'22)
    Copenhagen, Denmark, June 2022.

  5. SheerMP: Optimized Streaming Analytics-as-a-Service over Multi-site Multi-platform Settings (Demo Paper)
    George Stamatakis, Antonios Kontaxakis, Alkis Simitsis, Nikos Giatrakos, Antonios Deligiannakis
    In Proceedings of the 25th International Conference on Extending Database Technology (EDBT'22)
    Virtual Event, Edinburgh, UK, March 2022. (Presentation Video)

  6. EasyFlinkCEP: Big Event Data Analytics for Everyone
    Nikos Giatrakos, Eleni Kougioumtzi, Antonios Kontaxakis, Antonios Deligiannakis, Yannis Kotidis
    In Proceedings of the 30th ACM International Conference on Information and Knowledge Management (CIKM'21)
    Virtual Event, Gold Coast, Queensland, Australia, November 2021. (Presentation Video)

  7. Online Distributed Maritime Event Detection & Forecasting over Big Vessel Tracking Data (Industry Paper)
    Marios Vodas, Konstantina Bereta, Dimitris Kladis, Dimitris Zissis, Elias Alevizos, Emmanouil Ntoulias, Alexander Artikis, Antonios Deligiannakis, Antonios Kontaxakis, Nikos Giatrakos, David Arnu, Edwin Yaqub, Fabian Temme, Mate Torok, Ralf Klinkenberg
    In Proceedings of the 2021 IEEE International Conference on Big Data (IEEE BigData'21)
    Virtual Event, Orlando, FL, USA, December 2021. (Presentation Video)

  8. Extreme-Scale Interactive Cross-Platform Streaming Analytics -- The INFORE Approach
    Antonios Deligiannakis, Nikos Giatrakos, Yannis Kotidis, Vasilis Samoladas, Alkis Simitsis
    In Proceedings of the 2nd Workshop on Search, Exploration, and Analysis in Heterogeneous Datastores (SEA Data '21)
    Copenhagen, Denmark, August 2021. (Presentation Video)

  9. INforE: Interactive Cross-Platform Analytics for Everyone [** Best Demo Paper Award **]
    Nikos Giatrakos, David Arnu, Theodoros Bitsakis, Antonios Deligiannakis, Minos Garofalakis, Ralf Klinkenberg, Aris Konidaris, Antonis Kontaxakis, Yannis Kotidis, Vasilis Samoladas, Alkis Simitsis, George Stamatakis, Fabian Temme, Mate Torok, Edwin Yaqub, Arnau Montagud, Miguel Ponce, Holger Arndt, Stefan Burkard
    In Proceedings of the 29th ACM International Conference on Information and Knowledge Management (CIKM'20)
    Virtual Event, Ireland, October 2020. (Presentation Video)

  10. A Synopses Data Engine for Interactive Extreme-Scale Analytics
    Antonis Kontaxakis, Nikos Giatrakos, Antonios Deligiannakis
    In Proceedings of the 29th ACM International Conference on Information and Knowledge Management (CIKM'20)
    Virtual Event, Ireland, October 2020. (Presentation Video)

  11. Uncertainty-Aware Event Analytics over Distributed Settings (Industry Paper)
    Nikos Giatrakos, Alexander Artikis, Antonios Deligiannakis, Minos Garofalakis
    In Proceedings of the 13th ACM International Conference on Distributed and Event-based Systems (DEBS'19)
    Darmstadt, Germany, June 2019.

  12. Complex Event Recognition in the Big Data Era (Tutorial) [Slides]
    Nikos Giatrakos, Alexander Artikis, Antonios Deligiannakis, Minos Garofalakis
    In Proceedings of the 43rd International Conference on Very Large Databases (VLDB'17, PVLDB Vol. 10)
    Munich, Germany, August 2017.

  13. Scalable Approximate Query Tracking over Highly Distributed Data Streams
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis
    In Proceedings of ACM SIGMOD International Conference on Management of Data (SIGMOD'16)
    San Francisco, CA, USA, June 2016.

  14. FERARI: A Prototype for Complex Event Processing over Streaming Multi-cloud Platforms (Demo Paper)
    Ioannis Flouris, Vasiliki Manikaki, Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis,
    Michael Mock, Sebastian Bothe, Inna Skarbovsky, Fabiana Fournier, Marko Štajcer, Tomislav Križan,
    Jonathan Yom-Tov, Taji Ćurin
    In Proceedings of ACM SIGMOD International Conference on Management of Data (SIGMOD'16)
    San Francisco, CA, USA, June 2016.

  15. Complex Event Processing over Streaming Multi-Cloud Platforms - The FERARI Approach (Demo Paper)
    Ioannis Flouris, Vasiliki Manikaki, Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis,
    Michael Mock, Sebastian Bothe, Inna Skarbovsky, Fabiana Fournier, Marko Štajcer, Tomislav Križan,
    Jonathan Yom-Tov, Marijo Volarević
    In Proceedings of the 10th International Conference on Distributed and Event-Based Systems (DEBS'16)
    Irvine, CA, USA, June 2016.

  16. Issues in Complex Event Processing Systems [** Invited to Journal of Systems and Software **]
    Ioannis Flouris, Nikos Giatrakos, Minos Garofalakis, Antonios Deligiannakis
    In Proceedings of the 2015 IEEE Trustcom/BigDataSE/ISPA - Volume 02 (Trustcom/BigDataSE/ISPA'15)
    Helsinki, Finland, August 2015.

  17. Towards a Prototype Medical System for Devices Vigilance and Patient Safety
    Antonios Deligiannakis, Nikos Giatrakos, Nicolas Pallikarakis
    In Proceedings of the IEEE Symposium on Computational Intelligence in Healthcare and e-health (CICARE'14)
    Orlando, Florida, December 2014.

  18. Information Extraction Matching and Reporting for Medical Devices Vigilance
    A. Anastasiou, Z. Bliznakov, A. Deligiannakis, N. Giatrakos, M. Haritou, E. Ioannou, D. Koutsouris, P. Malataras, N. Pallikarakis, K. Stavrianou, C. Tsirmpas
    In Proceedings of the 6th European Conference of the International Federation for Medical and Biological Engineering (MBEC‘14)
    Dubrovnik, Croatia, August 2014

  19. Cost Models for Nearest Neighbor Query Processing over Existentially Uncertain Spatial Data
    Elias Frentzos, Nikos Pelekis, Nikos Giatrakos, Yannis Theodoridis
    In Proceedings of the 13th International Symposium on Spatial and Temporal Databases (SSTD'13)
    Munich, Germany, August 2013.

  20. Prediction-Based Geometric Monitoring over Distributed Data Streams
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Izchak Sharfman, Assaf Schuster
    In Proceedings of ACM SIGMOD International Conference on Management of Data (SIGMOD'12)
    Scottsdale, AZ, USA, May 2012.

  21. SeTraStream: Semantic-Aware Trajectory Construction over Streaming Movement Data
    Zhixian Yan, Nikos Giatrakos, Vangelis Katsikaros, Nikos Pelekis, Yannis Theodoridis
    In Proceedings of the 12th International Symposium on Spatial and Temporal Databases (SSTD'11)
    Minneapolis, MN, USA, August 2011.

  22. PAO: Power-Efficient Attribution of Outliers in Wireless Sensor Networks
    Nikos Giatrakos, Yannis Kotidis, Antonios Deligiannakis
    In Proceedings of 7th VLDB Workshop on Data Management for Sensor Networks (DMSN'10)
    Singapore, September 2010.

  23. TACO: Tunable Approximate Computation of Outliers in Wireless Sensor Networks
    Nikos Giatrakos, Yannis Kotidis, Antonios Deligiannakis, Vasilis Vassalos, Yannis Theodoridis
    In Proceedings of ACM SIGMOD International Conference on Management of Data (SIGMOD'10)
    Indianapolis, IN, USA, June 2010.

  24. T-Warehouse: Visual OLAP Analysis on Trajectory Data (Demo Paper)
    Luca Leonardi, Gerasimos Marketos, Elias Frentzos, Nikos Giatrakos, Salvatore Orlando, Nikos Pelekis, Alessandra Raffaeta, Alessandro Roncato, Claudio Silvestri, Yannis Theodoridis
    In Proceedings of the 26th International Conference on Data Engineering (ICDE'10)
    Los Angeles, CA, USA, March 2010.

  25. HERMES: Aggregative LBS via a Trajectory DB Engine (Demo Paper)
    Nikos Pelekis, Elias Frentzos, Nikos Giatrakos, Yannis Theodoridis
    In Proceedings of ACM SIGMOD International Conference on Management of Data (SIGMOD'08)
    Vancouver, Canada, June 2008.

  26. Identifying Unknown Border Lines from Historical Spatiotemporal Data: The DIACHORON Approach
    Elias Frentzos, Nikos Pelekis, Nikos Giatrakos, Yannis Theodoridis
    In Proceedings of the International Conference on Telecommunications and Multimedia (TEMU'08)
    Ierapetra, Greece, July 2008.ISBN: 978-960-88785-6-3
Other Refereed Publications
  1. Prediction-Based Geometric Monitoring over Distributed Data Streams
    Nikos Giatrakos, Antonios Deligiannakis, Minos Garofalakis, Izchak Sharfman, Assaf Schuster
    In Proceedings of the 11th Hellenic Data Management Symposium (HDMS'12)
    Chania, Crete, June 2012.

  2. Approximate Computation of Outliers in Wireless Sensor Networks
    Nikos Giatrakos, Yannis Kotidis, Antonios Deligiannakis, Vasilis Vassalos, Yannis Theodoridis
    In Proceedings of the 9th Hellenic Data Management Symposium (HDMS'10)
    Ayia Napa, Cyprus, July 2010.

  3. A Framework for Trajectory Data Warehousing
    Gerasimos Marketos, Elias Frentzos, Nikos Giatrakos, Irene Ntoutsi, Nikos Pelekis, Alessandra Raffaeta, Yannis Theodoridis
    In Proceedings of the 7th Hellenic Data Management Symposium (HDMS'08)
    Heraklion, Greece, July 2008.
Technical Reports
  1. Supporting Movement in ORDBMS – The ‘HERMES’ MOD Engine
    Nikos Pelekis, Elias Frentzos, Nikos Giatrakos, Yannis Theodoridis
    Information Management Lab, University of Piraeus, Technical Report Series: UNIPI-INFOLAB-TR-2010-01, July 2010.

  2. Hands-On in Hermes MOD Engine
    N. Pelekis, M. Vodas, N. Giatrakos, E. Frentzos, G. Marketos, A. Plemenos, I. Kopanakis, Y. Theodoridis
    Information Management Lab, University of Piraeus, May 2011.