Publications

    2024

  1. Sergios-Anestis Kefalidis, Dharmen Punjani, Eleni Tsalapati, Konstantinos Plas, Maria-Aggeliki Pollali, Pierre Maret and Manolis Koubarakis. The question answering system GeoQA2 and a new benchmark for its evaluation. International Journal of Applied Earth Observation and Geoinformation, Volume 134, November 2024 [link]
  2. Angelos Poulis, Eleni Tsalapati, and Manolis Koubarakis. Transformer-based Language Models for Reasoning in the Description Logic ALCQ. 1st International Workshop on Next-Generation Language Models for Knowledge Representation and Reasoning (NeLaMKRR@KR 2024), 2-8 November, Hanoi, Vietnam, 2024 [link]
  3. Anastasios Mantas, Filippos Yfantis, Dimitris Bilidas, George Stamoulis, Spyros Kondylatos, Ioannis Prapas, Ioannis Papoutsis, José María Tárraga Habas, Eva Sevillano Marco, Fabien Castel, Camille Laine and Manolis Koubarakis. Plato: A Semantic Data Cube System using Ontology-Based Data Access Technologies. IEEE Access Journal, 9 September, 2024 [link]
  4. Vasileios Saketos, Despina-Athanasia Pantazi and Manolis Koubarakis. The Large Language Model GreekLegalRoBERTa. 13th EETN Conference on Artificial Intelligence (SETN 2024), September 11-13, 2024, Piraeus, Greece, [pdf]
  5. Christine Kakalou, Christina Karamanidou, Theodore Dalamagas and Manolis Koubarakis. Enhancing Patient Empowerment and Graphs with Language Models for Personalized Health Content Delivery. 34th Medical Informatics Europe Conference: Digital Health & Informatics Innovations for Sustainable Health Care Systems, August 25-29, 2024 [pdf]
  6. Franziska Neuhof, Marco Fisichella, George Papadakis, Konstantinos Nikoletos, Nikolaus Augsten, Wolfgang Nejdl and Manolis Koubarakis. Open benchmark for filtering techniques in entity resolution The VLDB Journal, July 9, 2024. [link]
  7. Dimitris Bilidas, Anastasios Mantas, Filippos Yfantis, George Stamoulis and Manolis Koubarakis. Plato: Implementing a Semantic Data Cube System. 43rd European Association of Remote Sensing Laboratories (EARSeL), June 17-20, 2024, Manchester, United Kingdom
  8. Antonis Troumpoukis, Iraklis Klampanos, Despina-Athanasia Pantazi, Eleni Tsalapati, Mohanad Albughdadi, Vasileios Baousis, Omar Barrilero, Alexandra Bojor, Pedro Branco, Lorenzo Bruzzone, Andreina Chietera, Philippe Fournand, Richard Hall, Michele Lazzarini, Adrian Luna, Alexandros Nousias, Christos Perentis, George Petrakis, Dharmen Punjani, David Röbl, George Stamoulis, Eleni Tsalapati, Indrė Urbanavičiūtė, Giulio Weikmann, Xenia Ziouvelou, Marcin Ziółkowski, Manolis Koubarakis and Vangelis Karkaletsis. European AI and EO convergence via a novel community-driven framework for data-intensive innovation Future Generation Computer Systems Journal, June 10, 2024 [link]
  9. Dimitris Bilidas, Anastasios Mantas, Filippos Yfantis, George Stamoulis, Manolis Koubarakis, José María Tárraga Habas, Eva Sevillano Marco, Fabien Castel, Camille Laine. The Semantic Data Cube System Plato and Its Applications. IEEE International Geoscience and Remote Sensing Symposium (IGARSS '24), July 7-12, 2024, Athens, Greece [pdf]
  10. Marios Papamichalopoulos, George Papadakis, George Mandilaras, Maria Siampou, Nikos Mamoulis, Manolis Koubarakis. Three-dimensional Geospatial Interlinking with JedAI-spatial. Journal of Web Semantics, Volume 81, July 2024 [pdf]
  11. Christine Kakalou, Christina Karamanidou, Theodore Dalamagas and Manolis Koubarakis. Personalised Medical Content Delivery to Support Patient Empowerment based on Knowledge Graphs. The 15th International SWAT4HCLS conference (SWAT4HCLS’24), February 26-29, 2024 [pdf]

    12. 2023

  12. Vasilis Efthymiou, Ekaterini Ioannou, Manos Karvounis, Manolis Koubarakis, Jakub Maciejewski, Konstantinos Nikoletos, George Papadakis, Dimitris Skoutas, Yannis Velegrakis, Alexandros Zeakis. Self-configured Entity Resolution with pyJedAI. 2023 IEEE International Conference on Big Data (IEEE BigData) , Sorrento, Italy, 15-18 December 2023 [pdf]
  13. Dimitris Bilidas, Anastasios Mantas, Filippos Yfantis, George Stamoulis, Manolis Koubarakis, Spyros Kondylatos, Ioannis Prapas, Ioannis Papoutsis. Fire Risk Management using Data Cubes, Machine Learning and OBDA systems (Demo Paper). The 31st ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL '23), November 13-16, 2023, Hamburg, Germany [pdf]
  14. Maria Despoina Siampou, George Papadakis, Nikos Mamoulis, Manolis Koubarakis. Supervised Scheduling for Geospatial Interlinking. The 31st ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL '23), November 13-16, 2023, Hamburg, Germany [pdf]
  15. Eleni Tsalapati and Manolis Koubarakis. SHM: A Light-weight, Mid-level Ontology for Reliable System Health Monitoring. The 2nd International Workshop on Semantic Industrial Information Modelling (SemIIM’23), 7th November 2023, Athens, Greece [pdf]
  16. Eleni Tsalapati, Markos Iliakis and Manolis Koubarakis. Location Query Answering Using Box Embeddings. Workshop at ISWC 2023: Deep Learning for Knowledge Graphs, November 6-10, Athens, Greece [pdf]
  17. Konstantinos Salmas, Despina-Athanasia Pantazi and Manolis Koubarakis. Extracting geographic knowledge from large language models. KBC-LM’23: Knowledge Base Construction from Pre-trained Language Models workshop at ISWC 2023, 7th November 2023, Athens, Greece [pdf]
  18. Marco Corsi, Giorgio Pasquali, Chiara Pratola, Simone Tilia, Sergios-Anestis Kefalidis, Konstantinos Plas, Mariangela Pollali, Eleni Tsalapati, Myrto Tsokanaridou, Manolis Koubarakis, Kai Norman Clasen, Leonard Hackel, Jakob Hackstein, Gencer Sumbul, Begüm Demir and Nicolas Longépé. DA4DTE: DEVELOPING A DIGITAL ASSISTANT FOR SATELLITE DATA ARCHIVES Conference on Big Data from Space (BiDS23) 2023, Vienna, Austria, 6-9 November, 2023 [pdf]
  19. Dimitris Bilidas, Anastasios Mantas, Filippos Yfantis, George Stamoulis and Manolis Koubarakis. Plato: A Semantic Data Cube Implementation using Ontology-Based Data Access Technologies (Poster) Conference on Big Data from Space (BiDS23) 2023, Vienna, Austria, 6-9 November, 2023 [pdf]
  20. Antonis Troumpoukis, Iraklis Klampanos, Despina-Athanasia Pantazi, Eleni Tsalapati, Mohanad Albughdadi, Mihai Alexe, Vasileios Baousis, Omar Barrilero, Bryce Billière, Alexandra Bojor, Pedro Branco, Lorenzo Bruzzone, Andreina Chietera, Philippe Fournand, Richard Hall, David Hassan, Michele Lazzarini, Adrian Luna, Dharmen Punjani, George Stamoulis, Giulio Weikmann, Marcin Ziółkowski, Xenia Ziouvelou, Manolis Koubarakis and Vangelis Karkaletsis. Bridging the European Earth-Observation and AI Communities for Data-Intensive Innovation 2023 IEEE Ninth International Conference on Big Data Computing Service and Applications (BigDataService), Athens, Greece, 2023 [pdf]
  21. Sergios-Anestis Kefalidis, Dharmen Punjani, Eleni Tsalapati, Konstantinos Plas, Mariangela Pollali, Michail Mitsios, Myrto Tsokanaridou, Manolis Koubarakis, and Pierre Maret. Benchmarking Geospatial Question Answering Engines using the Dataset GeoQuestions1089 The 22nd International Semantic Web Conference, Athens, Greece, 6-10 November, 2023 [pdf]
  22. Ioannis Dravilas, Stavros Dafis, Georgios Kyros, Konstantinos Lagouvardos and Manolis Koubarakis. Towards a Machine Learning Snowfall Retrieval Algorithm for GPM-IMERG The 16th International Conference on Meteorology, Climatology and Atmospheric Physics (COMECAP 2023), Athens, Greece, 25-29 September, 2023 [pdf]
  23. Dharmen Punjani, Sergios-Anestis Kefalidis, Konstantinos Plas, Eleni Tsalapati, Manolis Koubarakis, and Pierre Maret. The Question Answering System GeoQA2. The 2nd International Workshop on Geospatial Knowledge Graphs and GeoAI: Methods, Models, and Resources, Leeds, UK, 12 September, 2023 [pdf]
  24. Alexandros Zeakis, George Papadakis, Dimitrios Skoutas, Manolis Koubarakis. Pre-trained Embeddings for Entity Resolution: An Experimental Analysis. The 49th International Conference on Very Large Data Bases, Vancouver, Canada, August 28 - September 1, 2023 [pdf]
  25. Dharmen Punjani, Manolis Koubarakis and Eleni Tsalapati. EarthQA: a question answering engine for Earth observation data archives. The 43rd International Geoscience and Remote Sensing Symposium (IGARSS 2023), California, USA, 16-21 July, 2023 [pdf]
  26. Manolis Koubarakis. Geospatial Data Science: A Hands-on Approach for Building Geospatial Applications Using Linked Data Technologies. ACM Books 51, ACM 2023, ISBN 979-8-4007-0740-7 [link]
  27. Sören Auer, Dante A. C. Barone, Cassiano Bartz, Eduardo G. Cortes, Mohamad Yaser Jaradeh, Oliver Karras, Manolis Koubarakis, Dmitry Mouromtsev, Dmitrii Pliukhin, Daniil Radyush, Ivan Shilin, Markus Stocker and Eleni Tsalapati. The SciQA Scientific Question Answering Benchmark for Scholarly Knowledge. Sci Rep 13, 7240 (2023) [pdf]
  28. Florian Appel, Heike Bach, Silke Migdall, Manolis Koubarakis, George Stamoulis, Dimitris Bilidas, Despina-Athanasia Pantazi, Lorenzo Bruzzone, Giulio Weikmann. ExtremeEarth: Managing Water Availability for Crops Using Earth Observation and Machine Learning. The 26th International Conference on Extending Database Technology (EDBT2023). Ioannina, Greece, 28-31 March, 2023 [pdf]
  29. Niloy Ganguly, Dren Fazlija, Maryam Badar, Marco Fisichella, Sandipan Sikdar, Johanna Schrader, Jonas Wallat, Koustav Rudra, Manolis Koubarakis, Gourab K. Patro, Wadhah Zai El Amri, Wolfgang Nejdl. A Review of the Role of Causality in Developing Trustworthy AI Systems. CoRR abs/2302.06975 (2023) [pdf]
  30. Alexandros Zeakis, George Papadakis, Dimitrios Skoutas, Manolis Koubarakis. Pre-trained Embeddings for Entity Resolution: An Experimental Analysis [Experiment, Analysis & Benchmark]. CoRR abs/2304.12329 (2023) [pdf]
  31. Koubarakis, M., Bereta, K., Nikolaou, C., Stamoulis, G. Linked Geospatial Data. In: Zomaya, A., Taheri, J., Sakr, S. (eds) Encyclopedia of Big Data Technologies. 2023, Springer, Cham. [pdf]

    32. 2022

  32. Alexandros Zeakis, Dimitrios Skoutas, Dimitris Sacharidis, Odysseas Papapetrou, Manolis Koubarakis. TokenJoin: Efficient Filtering for Set Similarity Join with Maximum Weighted Bipartite Matching. Proc. VLDB Endow. 16 (2022): 790-802. [pdf]
  33. Konstantinos Nikoletos, George Papadakis and Manolis Koubarakis. pyJedAI: a Lightsaber for Link Discovery. The 21st International Semantic Web Conference, Virtual Conference, 23-27 October, 2022. Demo paper [pdf]
  34. Dimitris Bilidas, Theofilos Ioannidis, Nikos Mamoulis and Manolis Koubarakis. Strabo 2: Distributed Management of Massive Geospatial RDF Datasets. The 21st International Semantic Web Conference, Virtual Conference, 23-27 October, 2022 [pdf]
  35. Christine Kakalou, Pantelis Natsiavas, Theodore Dalamagas and Manolis Koubarakis. Medication and Adverse Drug Events Information Extraction in Discharge Summaries to Enrich Discharge Medication Instructions. IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI), 27-30 September, 2022 [pdf]
  36. Maria Despoina Siampou, Nikolaos Karalis and Manolis Koubarakis. Extending YAGO4 Knowledge Graph with Geospatial Knowledge. 5th International Workshop on Geospatial Linked Data at ESWC’22, Hersonissos, Greece, May 29 - June 2, 2022 [pdf]
  37. Christos C. Papadopoulos, Yannis Panagakis, Manolis Koubarakis, Mihalis A. Nicolaou Efficient Learning of Multiple NLP Tasks via Collective Weight Factorization on BERT. In 2022 Annual Conference of the North American Chapter of the Association for Computational Linguistics (NAACL 2022). Findings. Seattle, USA, July 10–15, 2022. [pdf]
  38. Manolis Koubarakis, Konstantina Bereta, Dimitris Bilidas, Despina-Athanasia Pantazi, George Stamoulis A Data Science Pipeline for Big Linked Earth Observation Data. In: Curry, E., Auer, S., Berre, A.J., Metzger, A., Perez, M.S., Zillner, S. (eds) Technologies and Applications for Big Data Value . Springer, Cham [pdf]
  39. George Papadakis, Georgios Mandilaras, Nikos Mamoulis, Manolis Koubarakis Static and Dynamic Progressive Geospatial Interlinking. ACM Transactions on Spatial Algorithms and Systems (TSAS), 2022 (to appear) [pdf]

    40. 2021

  40. Christos Papaloukas, Ilias Chalkidis, Konstantinos Athinaios, Despina-Athanasia Pantazi and Manolis Koubarakis Multi-granular Legal Topic Classification on Greek Legislation. NLLP Workshop 2021 in conjunction with EMNLP2021, 10 November, 2021 [pdf]
  41. Desta Haileselassie Hagos, Theofilos Kakantousis, Vladimir Vlassov, Sina Sheikholeslami, Tianze Wang, Jim Dowling, Claudia Paris, Daniele Marinelli, Giulio Weikmann, Lorenzo Bruzzone, Salman Khaleghian, Thomas Kræmer, Torbjørn Eltoft, Andrea Marinoni, Despina-Athanasia Pantazi, George Stamoulis, Dimitris Bilidas, George Papadakis, George Mandilaras, Manolis Koubarakis, Antonis Troumpoukis, Stasinos Konstantopoulos, Markus Muerth, Florian Appel, Andrew Fleming, and Andreas Cziferszky ExtremeEarth Meets Satellite Data From Space. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021 [pdf]
  42. George Mandilaras and Manolis Koubarakis Scalable Transformation of Big Geospatial Data into Linked Data. The 20th International Semantic Web Conference, Virtual Conference, 24-28 October, 2021 [pdf]
  43. George Mandilaras, George Papadakis, Luca Gagliardelli, Giovanni Simonini, Emmanouil Thanos, George Giannakopoulos, Sonia Bergamaschi, Themis Palpanas, Manolis Koubarakis, Alicia Lara-Clares, Antonio Fariña Reproducible experiments on Three-Dimensional Entity Resolution with JedAI. Information Systems, Volume 102, December 2021 [link]
  44. Desta Haileselassie Hagos, Theofilos Kakantousis, Vladimir Vlassov, Sina Sheikholeslami, Tianze Wang, Jim Dowling, Andrew Fleming, Andreas Cziferszky, Markus Muerth, Florian Appel, Despina-Athanasia Pantazi, Dimitris Bilidas, George Papadakis, George Mandilaras, George Stamoulis, Manolis Koubarakis, Antonis Troumpoukis, Stasinos Konstantopoulos The ExtremeEarth Software Architecture for Copernicus Earth Observation Data. Conference on Big Data from Space (BiDS21) 2021. Virtual event, 18-20 May 2021 [pdf]
  45. Manolis Koubarakis, George Stamoulis, Dimitris Bilidas, Theofilos Ioannidis, George Mandilaras, Despina-Athanasia Pantazi, George Papadakis, Vladimir Vlassov, Amir H. Payberah, Tianze Wang, Sina Sheikholeslami, Desta Haileselassie Hagos, Lorenzo Bruzzone, Claudia Paris, Giulio Weikmann, Daniele Marinelli, Torbjørn Eltoft, Andrea Marinoni, Thomas Kræmer, Salman Khaleghian, Habib Ullah, Antonis Troumpoukis, Nefeli Prokopaki Kostopoulou, Stasinos Konstantopoulos, Vangelis Karkaletsis, Jim Dowling, Theofilos Kakantousis, Mihai Datcu, Wei Yao, Corneliu Octavian Dumitru, Florian Appel, Silke Migdall, Markus Muerth, Heike Bach, Nick Hughes, Alistair Everett, Ashild Kiærbech, Joakim Lillehaug Pedersen, David Arthurs, Andrew Fleming, Andreas Cziferszky Artificial Intelligence and Big Data Technologies for Copernicus Data: The ExtremeEarth Project. Conference on Big Data from Space (BiDS21) 2021. Virtual event, 18-20 May 2021 [pdf]
  46. Ioannis Papoutsis, Alkyoni Baglatzi, Souzana Touloumtzi, Markus Reichstein, Nuno Carvalhais, Fabian Gans, Gustau Camps-Valls, Maria Piles, Theofilos Kakantousis, Jim Dowling, Manolis Koubarakis, Dimitris Bilidas, Despina-Athanasia Pantazi, George Stamoulis, Christophe Demange, Léo-Gad Journel, Marco Bianchi, Chiara Gervasi, Alessio Rucci, Ioannis Tsampoulatidis, Eleni Kamateri, Tarek Habib, Alejandro Diaz Bolivar, Zisoula Ntasiou, Anastasios Paschalis DeepCube: Explainable AI Pipelines for Big Copernicus Data. Conference on Big Data from Space (BiDS21) 2021. Virtual event, 18-20 May 2021 [pdf]
  47. Dimitris Bilidas and Manolis Koubarakis. Handling redundant processing in OBDA query execution over relational sources. Journal of Web Semantics. Volume 68, April 2021 [link][pdf]
  48. George Papadakis, Georgios Mandilaras, Nikos Mamoulis, Manolis Koubarakis Progressive, Holistic Geospatial Interlinking. The Web Conference 2021, April 19 - 23, Ljubljana, Slovenia, 2021. [pdf]
  49. Theofilos Ioannidis, George Garbis, Kostis Kyzirakos, Konstantina Bereta and Manolis Koubarakis Evaluating Geospatial RDF stores Using the Benchmark Geographica 2. Journal on Data Semantics. [pdf]
  50. Konstantina Bereta, George Papadakis and Manolis Koubarakis Ontop4theWeb: SPARQLing the Web On-the-fly. The 15th IEEE International Conference on Semantic Computing (ICSC2021), 27-29 January, 2021. Short paper. [pdf]
  51. Dharmen Punjania, Markos Iliakis, Theodoros Stefou, Kuldeep Singh, Andreas Both, Manolis Koubarakis, Iosif Angelidis, Konstantina Bereta, Themis Beris, Dimitris Bilidas, Theofilos Ioannidis, Nikolaos Karalis, Christoph Lange, Despina-Athanasia Pantazi, Christos Papaloukas, Georgios Stamoulis. Template-Based Question Answering over Linked Geospatial Data. arXiv.org [pdf]

    52. 2020

  52. Antonis Troumpoukis, Stasinos Konstantopoulos, Giannis Mouchakis, Nefeli Prokopaki-Kostopoulou, Claudia Paris, Lorenzo Bruzzone, Despina-Athanasia Pantazi and Manolis Koubarakis GeoFedBench: A Benchmark for Federated GeoSPARQL Query Processors. The 19th International Semantic Web Conference, Virtual Conference, 1-6 November, 2020 [pdf]
  53. Manolis Koubarakis, Harith Alani, Grigoris Antoniou, Kalina Bontcheva, John G. Breslin, Diego Collarana, Elena Demidova, Stefan Dietze, Simon Gottschalk, Guido Governatori, Aidan Hogan, Freddy Lécué, Elena Montiel-Ponsoda, Axel-Cyrille Ngonga Ngomo, Sofia Pinto, Muhammad Saleem, Raphaël Troncy, Eleni Tsalapati, Ricardo Usbeck, Ruben Verborgh Joint Proceedings of Workshops AI4LEGAL2020, NLIWOD, PROFILES 2020, QuWeDa 2020 and SEMIFORM2020 Colocated with the 19th International Semantic Web Conference (ISWC 2020). Virtual Conference, November, 2020. [link]
  54. Dimitris Bilidas and Manolis Koubarakis In-memory parallelization of join queries over large ontological hierarchies. Distributed and Parallel Databases 2020 [link]
  55. George Papadakis, George Mandilaras, Luca Gagliardelli, Giovanni Simonini, Emmanouil Thanos, George Giannakopoulos, Sonia Bergamaschi, Themis Palpanas, Manolis Koubarakis Three-Dimensional Entity Resolution with JedAI. Journal of Information Systems. Volume 93, November 2020 [pdf]
  56. George Mandilaras, Despina-Athanasia Pantazi, Manolis Koubarakis, Nick Hughes, Alistair Everett, Ashild Kiærbech. Ice Monitoring With ExtremeEarth. LASCAR 2020 : 2nd Workshop on Large Scale RDF Analytics, Virtual, 31st May, 2020 [pdf]
  57. George Papadakis, Leonidas Tsekouras, Manos Thanos, Nikiforos Pittaras, Giovanni Simonini, Dimitrios Skoutas, Paul Isaris, George Giannakopoulos, Themis Palpanas and Manolis Koubarakis. JedAI: beyond batch, blocking-based Entity Resolution. The 23rd International Conference on Extending Database Technology (EDBT2020). Copenhagen, Denmark, 30th March-2nd April, 2020 [pdf]
  58. Manolis Koubarakis, Alexander Borgida, Panos Constantopoulos, Martin Doerr, Matthias Jarke, Manfred A.Jeusfeld, John Mylopoulos and Dimitris Plexousakis. A retrospective on Telos as a metamodeling language for requirements engineering. Requirements Engineering 2020 [pdf]

    59. 2019

  59. George Papadakis, Leonidas Tsekouras, Emmanouil Thanos, George Giannakopoulos, Themis Palpanas and Manolis Koubarakis. Domain- and Structure-Agnostic End-to-End Entity Resolution with JedAI. Sigmod Record. December 2019 [pdf]
  60. Konstantina Bereta, Guohui Xiao and Manolis Koubarakis. Ontop-spatial: Ontop of geospatial databases. Journal of Web Semantics. Volume 58, October 2019 [pdf]
  61. Nikolaos Karalis, Georgios Mandilaras and Manolis Koubarakis. Extending the YAGO2 Knowledge Graph with Precise Geospatial Knowledge. The 18th International Semantic Web Conference (ISWC-19). Auckland, New Zealand, 26-30 October‚ 2019 [pdf]
  62. Themis Beris, Iosif Angelidis, Ilias Chalkidis, Charalampos Nikolaou, Christos Papaloukas, Panagiotis Soursos and Manolis Koubarakis. Towards a Decentralised, Trusted, Intelligent and Linked Public Sector. A Report from the Greek Trenches. Workshop on Linked Data on the Web and its Relationship with Distributed Ledgers (LDOW/LDDL). San Francisco, USA, 13-14 May‚ 2019 [pdf]
  63. Nikiforos Pittaras, George Papadakis, George Stamoulis, Giorgos Argyriou, Efi Karra Taniskidou, Emmanouil Thanos, George Giannakopoulos and Manolis Koubarakis. GeoSensor: Semantifying Change and Event Detection over Big Data. The 34th ACM/SIGAPP Symposium On Applied Computing (SAC 2019). Limassol, Cyprus, 8-12 April‚ 2019 [pdf]
  64. Dimitris Bilidas and Manolis Koubarakis. Scalable Parallelization of RDF Joins on Multicore Architectures. The 22nd International Conference on Extending Database Technology (EDBT 2019). Lisbon, Portugal, 26-29 March, 2019 [pdf]
  65. Konstantina Bereta, Herve Caumont, Ulrike Daniels, Erwin Goor, Manolis Koubarakis, Despina-Athanasia Pantazi, George Stamoulis, Sam Ubels, Valentijn Venus, Firman Wahyudi and Dirk Daems. The Copernicus App Lab project: Easy Access to Copernicus Data. The 22nd International Conference on Extending Database Technology (EDBT 2019). Lisbon, Portugal, 26-29 March, 2019 [pdf]
  66. Manolis Koubarakis, Konstantina Bereta, Dimitris Bilidas, Konstantinos Giannousis, Theofilos Ioannidis, Despina-Athanasia Pantazi, George Stamoulis, Jim Dowling, Seif Haridi, Vladimir Vlassov, Lorenzo Bruzzone, Claudia Paris, Torbjørn Eltoft, Thomas Krämer, Angelos Charalabidis, Vangelis Karkaletsis, Stasinos Konstantopoulos, Theofilos Kakantousis, Mihai Datcu, Corneliu Octavian Dumitru, Florian Appel, Heike Bach, Silke Migdall, Nick Hughes, David Arthurs and Andrew Fleming. From Copernicus Big Data to Extreme Earth Analytics. The 22nd International Conference on Extending Database Technology (EDBT 2019). Lisbon, Portugal, 26-29 March, 2019. Short visionary paper on the goals of the ExtremeEarth project. [pdf]
  67. Efi Karra Taniskidou, George Papadakis, George Giannakopoulos and Manolis Koubarakis. Comparative Analysis of Content-based Personalized Microblog Recommendations. The 22nd International Conference on Extending Database Technology (EDBT 2019). Lisbon, Portugal, 26-29 March, 2019 [pdf]
  68. Konstantina Bereta, Hervé Caumont, Ulrike Daniels, Daems Dirk, Manolis Koubarakis, Despina-Athanasia Pantazi, George Stamoulis, Sam Ubels, Valentijn Venus, Firman Wahyudi. From Big Copernicus Data to Big Information and Big Knowledge: The Copernicus App Lab Project. Conference on Big Data from Space (BiDS19) 2019, Munich, Germany, 19-21 February, 2019. [pdf]
  69. Konstantina Bereta, Herve Caumont, Ulrike Daniels, Daems Dirk, Manolis Koubarakis, Despina-Athanasia Pantazi, George Stamoulis, Sam Ubels, Valentijn Venus and Firman Wahyudi. Providing Satellite Data to Mobile Developers Using Semantic Technologies and Linked Data. The 14th IEEE International Conference on Semantic Computing (ICSC 2019). San Diego, USA, 3-5 February‚ 2019 [pdf]

    70. 2018

  70. Konstantinos Giannousis, Konstantina Bereta, Nikolaos Karalis and Manolis Koubarakis. Distributed Execution of Spatial SQL Queries. 2018 IEEE International Conference on Big Data (IEEE Big Data 2018). Seattle, USA, 10-13 December‚ 2018 [pdf]
  71. Manolis Koubarakis, George A. Vouros, Georgios Chalkiadakis, Vassilis P. Plagianakos, Christos Tjortjis, Ergina Kavallieratou, Dimitris Vrakas, Nikolaos Mavridis, Georgios Petasis, Konstantinos Blekas and Anastasia Krithara. AI in Greece: The Case of Research on Linked Geospatial Data. AI Magazine, Vol. 39(2), p. 91-96, 2018 [link]
  72. Iosif Angelidis, Ilias Chalkidis and Manolis Koubarakis. Named Entity Recognition, Linking and Generation for Greek Legislation. The 31st international conference on Legal Knowledge and Information Systems (JURIX 2018). Groningen, The Netherlands, 12-14 December‚ 2018 [pdf]
  73. Dimitris Bilidas and Manolis Koubarakis. Efficient Duplicate Elimination in SPARQL to SQL Translation. 31st International Workshop on Description Logics (DL 2018). Arizona, USA, 27-29 October, 2018 [pdf]
  74. Konstantina Bereta, George Papadakis and Manolis Koubarakis. Querying the Web On-the-fly Using Ontologies and Mappings. 31st International Workshop on Description Logics (DL 2018). Arizona, USA, 27-29 October, 2018 [pdf]
  75. Konstantina Bereta, Hervé Caumont, Erwin Goor, Manolis Koubarakis, Despina-Athanasia Pantazi, George Stamoulis, Sam Ubels, Valentijn Venus and Firman Wahyudi. From Copernicus Big Data to Big Information and Big Knowledge: a Demo from the Copernicus App Lab Project. 27th ACM International Conference on Information and Knowledge Management (CIKM 2018). Turin, Italy, 22-26 October, 2018 [pdf] Best Demo Award
  76. D. Punjani, K. Singh, A. Both, M. Koubarakis, I. Angelidis, K. Bereta, T. Beris, D. Bilidas, T. Ioannidis, N. Karalis, C. Lange, D. Pantazi, C. Papaloukas and G. Stamoulis. Template-Based Question Answering over Linked Geospatial Data. Geographic Information Retrieval (GIR 2018) workshop. Collocated with ACM SIGSPATIAL. Seattle, USA, 6 November, 2018 [pdf]
  77. Iosif Angelidis, Ilias Chalkidis, Charalampos Nikolaou, Panagiotis Soursos and Manolis Koubarakis. Nomothesia: A Linked Data Platform for Greek Legislation. MIREL workshop, Luxembourg Logic for AI Summit (LuxLogAI 2018), Luxembourg, 17 September, 2018 [pdf]
  78. Kostis Kyzirakos, Dimitrianos Savva, Ioannis Vlachopoulos, Alexandros Vasileiou, Nikolaos Karalis, Manolis Koubarakis and Stefan Manegold. GeoTriples: Transforming geospatial data into RDF graphs using R2RML and RML mappings. Journal of Web Semantics, Elsevier, forthcoming [link]
  79. Manolis Koubarakis, Konstantina Bereta, Charalampos Nikolaou, George Stamoulis. Linked Geospatial Data. In: Sherif Sakr and Albert Y. Zomaya (eds). Encyclopedia of Big Data Technologies. Springer, 2018 [link]
  80. George Papadakis, Leonidas Tsekouras, Emmanouil Thanos, George Giannakopoulos, Themis Palpanas and Manolis Koubarakis. The return of JedAI: End-to-End Entity Resolution for Structured and Semi-Structured Data.Very Large Databases Conference (VLDB), 2018, Rio de Janeiro, Brazil, 27-31 August, 2018 [pdf]
  81. Konstantina Bereta, George Stamoulis and Manolis Koubarakis. Ontology-Based Data Access and Visualization of Big Vector amd Raster Data.International Geoscience and Remote Sensing Symposium (IGARSS) 2018, Valencia, Spain, 22-27 July, 2018 [pdf]
  82. Themis Beris and Manolis Koubarakis. Modeling and Preserving Greek Government Decisions using Semantic Web Technologies and Permissionless Blockchains.Extended Semantic Web Conference (ESWC) 2018, Heraklion, Greece, 3-7 June, 2018 [pdf]
  83. Giorgos Argyriou, George Papadakis, George Stamoulis, Efi Karra Taniskidou, Nikiforos Pittaras, George Giannakopoulos, Sergio Albani, Michele Lazzarini, Emanuele Angiuli, Anca Popescu, Argyros Argyridis and Manolis Koubarakis. GeoSensor: On-line Scalable Change and Event Detection over Big Data. The Web Conference 2018, Lyon, France, 23-27 April, 2018. Demo paper [pdf]
  84. Manolis Koubarakis, Hervé Caumont, Ulrike Daniels, Erwin Goor, Lara König and Valentijn Venus. Copernicus App Lab: A Platform for Easy Data Access Connecting the Scientific Earth Observation Community with Mobile Developers. The Web Conference 2018. Alternate track on International Projects, Lyon, France, 23-27 April, 2018 [pdf]

    85. 2017

  85. Konstantina Bereta and Manolis Koubarakis. Creating Virtual Semantic Graphs on top of Big Data from Space. Conference on Big Data from Space (BiDS-17), Toulouse, France, 28-30 November, 2017 [pdf]
  86. Manolis Koubarakis, Konstantina Bereta, George Papadakis, Dimitrianos Savva and George Stamoulis. Big, Linked Geospatial Data and Its Applications in Earth Observation. IEEE Internet Computing Magazine, pages 87-91, July/August 2017 [pdf]
  87. Stefan Burgstaller, Wolfgang Angermair, Fabian Niggemann, Silke Migdall, Heike Bach, Ioannis Vlahopoulos, Dimitrianos Savva, Panayiotis Smeros, George Stamoulis, Konstantina Bereta and Manolis Koubarakis. LEOpatra: A Mobile Application for Smart Fertilization Based on Linked Data. 8th International Conference on Information and Communication Technologies in Agriculture, Food & Environment. September 21-24, 2017. Chania, Crete, Greece [pdf]
  88. George Papadakis, Konstantina Bereta, Themis Palpanas and Manolis Koubarakis. Multi-core Meta-blocking for Big Linked Data. Proceeding of Semantics 2017. September 11-14, 2017. Amsterdam, The Netherlands [pdf]
  89. Konstantina Bereta, Guohui Xiao and Manolis Koubarakis. Answering GeoSPARQL quereis over relational data. 3rd European Conference on Free and Open Source Software for Geospatial systems (FOSS4G-E ), Paris, France, 18 - 22 July, 2017 [pdf]
  90. Sören Auer, Simon Scerri, Aad Versteden, Erika Pauwels, Angelos Charalambidis, Stasinos Konstantopoulos, Jens Lehmann, Hajira Jabeen, Ivan Ermilov, Gezim Sejdiu, Andreas Ikonomopoulos, Spyros Andronopoulos, Mandy Vlachogiannis, Charalambos Pappas, Athanasios Davettas, Iraklis A. Klampanos, Efstathios Grigoropoulos, Vangelis Karkaletsis, Victor de Boer, Ronald Siebes, Mohamed Nadjib Mami, Sergio Albani, Michele Lazzarini, Paulo Nunes, Emanuele Angiuli, Nikiforos Pittaras, George Giannakopoulos, Giorgos Argyriou, George Stamoulis, George Papadakis, Manolis Koubarakis, Pythagoras Karampiperis, Axel-Cyrille Ngonga Ngomo, Maria-Esther Vidal. The BigDataEurope Platform – Supporting the Variety Dimension of Big Data. International Conference on Web Engineering (ICWE), Rome, Italy, 5-8 June 2017 [pdf]
  91. Ilias Chalkidis, Charalampos Nikolaou, Panagiotis Soursos and Manolis Koubarakis. Modeling and Querying Greek Legislation using Semantic Web Technologies. Extended Semantic Web Conference (ESWC), Portoroz, Slovenia, 28 May - 1 June, 2017 [pdf]
  92. George Papadakis, Leonidas Tsekouras, Emmanouil Thanos, George Giannakopoulos, Themis Palpanas and Manolis Koubarakis. JedAI: The Force behind Entity Resolution Extended Semantic Web Conference (ESWC), Portoroz, Slovenia, 28 May - 1 June, 2017. Demo paper [pdf]
  93. Evgeny Kharlamov, Dag Hovland, Martin G. Skjæveland, Dimitris Bilidas, Ernesto Jiménez-Ruiz, Guohui Xiao, Ahmet Soylu, Davide Lanti, Martin Rezk, Dmitriy Zheleznyakov, Martin Giese, Hallstein Lie, Yannis Ioannidis, Yannis Kotidis, Manolis Koubarakis, Arild Waaler. Ontology Based Data Access in Statoil. Journal of Web Semantics. Volume 44, May 2017, Pages 3-36
  94. L. Zervakis, C. Tryfonopoulos, S. Skiadopoulos and M. Koubarakis Query Reorganisation Algorithms for Efficient Boolean Information Filtering In IEEE Transactions on Knowledge and Data Engineering (TKDE) 29(2): 418-432, 2017 [pdf]

    95. 2016

  95. Konstantina Bereta and Manolis Koubarakis. Ontop of Geospatial Databases . International Semantic Web Conference (ISWC), Kobe, Japan, 17-21 October 2016 [pdf]
  96. Konstantina Bereta, Guohui Xiao, Manolis Koubarakis, Martina Hodrius, Conrad Bielski, and Gunter Zeug. Ontop-spatial: Geospatial Data Integration using GeoSPARQL-to-SQL Translation. International Semantic Web Conference (ISWC), Kobe, Japan, 17-21 October 2016. Demo paper [pdf]
  97. George Papadakis , George Papastefanatos, Themis Palpanas , Manolis Koubarakis Boosting the efficiency of large-scale entity resolution with enhanced meta-blocking In Big Data Research, Vol. 5, Pages 1-22 [pdf]
  98. Manolis Koubarakis, Kostis Kyzirakos, Charalampos Nikolaou, George Garbis, Konstantina Bereta, Roi Dogani, Stella Giannakopoulou, Panayiotis Smeros, Dimitrianos Savva, George Stamoulis, Giannis Vlachopoulos, Stefan Manegold, Charalampos Kontoes, Themistocles Herekakis, Ioannis Papoutsis, and Dimitrios Michail Managing Big, Linked, and Open Earth-Observation Data Using the TELEIOS/LEO software stack In IEEE Geoscience and Remote Sensing Magazine, Vol. 4, Issue 3, p. 23-37, September 2016 [pdf]
  99. Lefteris Zervakis, Christos Tryfonopoulos, Spiros Skiadopoulos and Manolis Koubarakis. Full-text Support for Publish/Subscribe Ontology Systems. Extended Semantic Web Conference (ESWC), Heraklion, Crete, Greece, 29 May - 2 June 2016 [pdf]
  100. Sergio Albani, Michele Lazzarini, Manolis Koubarakis, Efi Karra Taniskidou, George Papadakis, Vangelis Karkaletsis, George Giannakopoulos. Integrating Remote and Social Sensing Data for a Scenario on Secure Societies in a Big Data Platform. Living Planet Symposium 2016, Prague, Czech Republic, May 2016
  101. Panayiotis Smeros and Manolis Koubarakis Discovering Spatial and Temporal Links among RDF Data. Linked Data on the Web Workshop (LDOW2016), 12 April 2016 [pdf]
  102. Jon Blower, Maik Riechert, Nino Pace and Manolis Koubarakis. Big Data meets Linked Data: What are the Opportunities? Conference on Big Data from Space (BiDS), Tenerife, Spain, March 2016 [pdf]
  103. George Papadakis, George Papastefanatos, Themis Palpanas, Manolis Koubarakis. Scaling Entity Resolution to Large, Heterogeneous Data with Enhanced Meta-blocking. International Conference on Extending Database Technology (EDBT), Bordeaux, France, March 2016. [link]
  104. Sergio Albani, Michele Lazzarini, Manolis Koubarakis, Efi Karra Taniskidou, George Papadakis, Vangelis Karkaletsis, George Giannakopoulos. A Pilot for Big Data Exploitation in the Space and Security Domain. Conference on Big Data from Space (BiDS), Tenerife, Spain, March 2016 [pdf]
  105. Charalampos Nikolaou and Manolis Koubarakis. Querying incomplete information in RDF with SPARQL. Artificial Intelligence, 2016.
  106. Stefan Brüggemann, Konstantina Bereta, Guohui Xiao and Manolis Koubarakis. Ontology-based data access for Maritime Security. In 13th Extended Semantic Web Conference (ESWC), Crete, Greece, May 30- June 2, 2016.. [pdf]
  107. M. Sioutis, J.-F. Condotta, and M. Koubarakis An Efficient Approach for Tackling Large Real World Qualitative Spatial Networks International Journal of Artificial Intelligence Tools, 2016.

    108. 2015

  108. Daniela Espinoza-Molina, Member, IEEE, Charalampos Nikolaou, Corneliu Octavian Dumitru, Konstantina Bereta, Manolis Koubarakis, Gottfried Schwarz, and Mihai Datcu, Fellow, IEEE. Very-High-Resolution SAR Images and Linked Open Data Analytics Based on Ontologies. Selected Topics in Applied Earth Observations and Remote Sensing, Journal of IEEE, Vol. 8, Issue 4, pages 1696-1708 [pdf]
  109. Charalampos Nikolaou, Kallirroi Dogani, Konstantina Bereta, George Garbis, Manos Karpathiotakis, Kostis Kyzirakos, Manolis Koubarakis. Sextant: Visualizing time-evolving linked geospatial data. In Journal of Web Semantics, Vol. 35, No 01. [link]
  110. D. Calvanese, M. Koubarakis and D. Toman Special Issue on Ontology-Based Data Access Journal of Web Semantics. Vol 33, 2015

    111. 2014

  111. Manolis Koubarakis, Panayiotis Smeros, Charalampos Nikolaou, George Garbis, Konstantina Bereta, Stella Giannakopoulou, Kallirroi Dogani, Maria Karpathiotaki, Ioannis Vlachopoulos, Dimitrianos Savva, George Stamoulis, Kostis Kyzirakos, Stefan Manegold, Bernard Valentin, Heike Bach, Fabian Niggemann, Philipp Klug, Wolfgang Angermair and Stefan Burgstaller. Linked Open Data in the Earth Observation Domain: the Vision of Project LEO. In the Proceedings of the 2014 Conference on Big Data from Space (BiDS '14). ESA-ESRIN, Frascati, Italy, November 12-14, 2014. [pdf]
  112. Jon Blower, Debbie Clifford, Pedro Goncalves, Manolis Koubarakis. The MELODIES Project: Integrating diverse data using linked data and cloud computing. In the Proceedings of the 2014 Conference on Big Data from Space (BiDS '14). ESA-ESRIN, Frascati, Italy, November 12-14, 2014. [pdf]
  113. Maria Karpathiotaki, Kallirroi Dogani, Manolis Koubarakis. Enabling Semantic Search for EO Products: an Ontology Matching Approach. In the 9th International Workshop on Ontology Matching (OM-2014), in conjuction with ISWC 2014. Riva del Garda, Trentino, Italy, October 20th, 2014. [pdf]
  114. Kostis Kyzirakos, Ioannis Vlachopoulos, Dimitrianos Savva, Stefan Manegold, Manolis Koubarakis. GeoTriples: a Tool for Publishing Geospatial Data as RDF Graphs Using R2RML Mappings. In the Proceedings of the ISWC 2014 Posters & Demonstrations Track, pp 393-396. Riva del Garda, Trentino, Italy, October 21th, 2014. [pdf]
  115. Kostis Kyzirakos, Ioannis Vlachopoulos, Dimitrianos Savva, Stefan Manegold, Manolis Koubarakis. GeoTriples: a Tool for Publishing Geospatial Data as RDF Graphs Using R2RML Mappings. Terra Cognita 2014, 6th International Workshop on the Foundations, Technologies and Applications of the Geospatial Web, in conjuction with ISWC 2014. Riva del Garda, Trentino, Italy, October 19-23, 2014. [pdf]
  116. Manolis Koubarakis, Charalampos Nikolaou, George Garbis, Konstantina Bereta, Panayiotis Smeros, Stella Gianakopoulou, Kallirroi Dogani, Maria Karpathiotaki, Ioannis Vlachopoulos, Dimitrianos Savva, Kostis Kyzirakos, Stefan Manegold, Bernard Valentin, Nicolas James, Heike Bach, Fabian Niggemann, Philipp Klug, Wolfgang Angermair, Stefan Burgstaller. Linked Open Data in the Earth Observation Domain: the Vision of Project LEO. In the Web Reasoning and Rule Systems conference (RR 2014). Athens, Greece, 15-17 September 2014. [pdf]
  117. Manolis Koubarakis, Giorgos B. Stamou, Giorgos Stoilos, Ian Horrocks, Phokion G. Kolaitis, Georg Lausen, Gerhard Weikum (Eds.). Reasoning Web. Reasoning on the Web in the Big Data Era. Proceedings of the 10th International Summer School 2014. Lecture Notes in Computer Science 8714, Springer 2014, ISBN 978-3-319-10586-4 Athens, Greece, September 8-13, 2014.
  118. Stella Giannakopoulou, Charalampos Nikolaou, Manolis Koubarakis. A Reasoner for the RCC-5 and RCC-8 Calculi Extended with Constants. In the Proceedings of the 28th AAAI Conference on Artificial Intelligence, pp. 2659-2665. Quebec City, Quebec, Canada, July 27-31, 2014. [pdf]
  119. Charalampos Nikolaou, Manolis Koubarakis. Fast Consistency Checking of Very Large Real-World RCC-8 Constraint Networks Using Graph Partitioning. In the Proceedings of the 28th AAAI Conference on Artificial Intelligence, pp. 2724-2730. Quebec City, Quebec, Canada, July 27-31, 2014. [pdf]
  120. Maria Karpathiotaki, Kallirroi Dogani, Manolis Koubarakis, Bernard Valentin, Paolo Mazzetti, Mattia Santoro, Sabina Di Franco. Prod-Trees: Semantic Search for Earth Observation Products. The Semantic Web: ESWC 2014 Satellite Events. Lecture Notes in Computer Science, pp 374-378. Anissaras, Crete, Greece, May 25-29, 2014. [pdf]
  121. Ioannis Vlachopoulos, Stavros Vassos, Manolis Koubarakis. Flexible Behavior for Worker Units in Real-Time Strategy Games Using STRIPS Planning. In the Proceedings of Artificial Intelligence: Methods and Applications. Lecture Notes in Computer Science Volume 8445, 2014, pp 555-568. SETN 2014, Ioannina, Greece, May 15-17, 2014.[pdf]
  122. C. Nikolaou, K. Kyzirakos, K. Bereta, K. Dogani, S. Giannakopoulou, P. Smeros, G. Garbis, M. Koubarakis, D. E. Molina, O. C. Dumitru, G. Schwarz and M. Datcu. Improving knowledge discovery from synthetic aperture radar images using the linked open data cloud and Sextant. Informal Proceedings of the Image Information Mining Conference: The Sentinels Era (ESA-EUSC-JRC 2014). Bucharest, Romania, 5-7 March, 2014. [pdf]
  123. M. Koubarakis. Linked Open Earth Observation Data: The LEO Project. Informal Proceedings of the Image Information Mining Conference: The Sentinels Era (ESA-EUSC-JRC 2014). Bucharest, Romania, 5-7 March, 2014. [pdf]
  124. M. Koubarakis, K. Kyzirakos, C. Nikolaou, G. Garbis, K. Bereta, P. Smeros, S. Gianakopoulou, K. Dogani, M. Karpathiotaki and I. Vlachopoulos. Linked Earth Observation Data:The Projects TELEIOS and LEO. In the Linking Geospatial Data Conference (LGD 2014). Campus London, Shoreditch. 5-6 March 2014. [pdf]
  125. K. Kyzirakos, M. Karpathiotakis, G. Garbis, C. Nikolaou, K. Bereta, I. Papoutsis, T. Herekakis, D. Michail, M. Koubarakis and C. Kontoes. Wildfire monitoring using satellite images, ontologies and linked geospatial data. In Journal of Web Semantics, Vol. 24, No 05. 22 January 2014. Journal. [pdf]
  126. K. Kyzirakos, S. Manegold, C. Nikolaou and M. Koubarakis. Building Virtual Earth Observatories Using Scientific Database and Semantic Web Technologies. In the European Research Consortium for Informatics and Mathematics News. January 2014. [link]
  127. C. Tryfonopoulos, S. Idreos, M. Koubarakis, and P. Raftopoulou. Distributed Large-Scale Information Filtering. In LNCS Transactions on Large-Scale Data- and Knowledge-Centered Systems (TLDKS), Springer. 2014. [pdf]
  128. Charalampos Nikolaou, Kostis Kyzirakos, Konstantina Bereta, Kallirroi Dogani, Stella Giannakopoulou, Panayiotis Smeros, George Garbis, Manolis Koubarakis, Daniela Espinoza-Molina, Corneliu Octavian Dumitru, Gottfried Schwarz, Mihai Datcu Big, Linked and Open Data: Applications in the German Aerospace Center ESWC (Satellite Events) 2014, Lecture Notes in Computer Science, pp. 444-449
  129. M. Giese, D. Calvanese, P. Haase, I. Horrocks, T. Hubauer, Y. Ioannidis, H. Kllapi, M. Koubarakis, Maurizion Lenzerini, R. Moller, M. Rodriguez Muro, O. Ozcep, R. Rosatti, R. Schlatte, M. Schmidt, A. Soylu and A. Waaler. Scalable End-User Access to Big Data. In: R. Arkekar (ed.) Big Data Computing. CRC Press, 2014.

    130. 2013

  130. G. Garbis, K. Kyzirakos and M. Koubarakis. Geographica: A Benchmark for Geospatial RDF Stores. In the 12th International Semantic Web Conference (ISWC 2013). Sydney, Australia. October 21-25, 2013. [pdf]
  131. Konstantina Bereta, Charalampos Nikolaou, Manos Karpathiotakis, Kostis Kyzirakos, and Manolis Koubarakis. SexTant: Visualizing Time-Evolving Linked Geospatial Data. In the 12th International Semantic Web Conference (ISWC 2013). Sydney, Australia. October 21-25, 2013. Demo paper. [pdf]
  132. Kostis Kyzirakos, Manos Karpathiotakis, Konstantina Bereta, George Garbis, Charalampos Nikolaou, Panayiotis Smeros, Stella Giannakopoulou, Kallirroi Dogani, and Manolis Koubarakis. The Spatiotemporal RDF Store Strabon. In the 13th International Symposium on Spatial and Temporal Databases (SSTD 2013). Munich, Germany, August 21-23, 2013. Demo paper. [pdf]
  133. Charalampos Nikolaou and Manolis Koubarakis. Querying Incomplete Geospatial Information in RDF. In the 13th International Symposium on Spatial and Temporal Databases (SSTD 2013). Munich, Germany, August 21-23, 2013. [pdf]
  134. Charalampos Nikolaou and Manolis Koubarakis. Incomplete Information in RDF. In the 7th International Conference on Web Reasoning and Rule Systems (RR 2013). Mannheim, Germany. July 27-29, 2013. [pdf]
  135. K. Bereta, P. Smeros and M. Koubarakis. Representing and Querying the valid time of triples for Linked Geospatial Data. In the 10th Extended Semantic Web Conference (ESWC 2013). Montpellier, France. May 26-30, 2013. [pdf]
  136. C. Nikolaou, K. Dogani, K. Kyzirakos and M. Koubarakis. Sextant: Browsing and Mapping the Ocean of Linked Geospatial Data. In the 10th Extended Semantic Web Conference (ESWC 2013). Montpellier, France. May 26-30, 2013. Demo paper. [pdf]
  137. D. Calvanese, M. Giese, P. Haase, I. Horrocks, T. Hubauer, Y. Ioannidis, E. Jiménez-Ruiz, E. Kharlamov, H. Kllapi, J. Klüwer, M. Koubarakis, S. Lamparter, R. Möller, C. Neuenstadt, T. Nordtveit, Ö. Özcep, R. M. driguez Muro, M. Roshchin, M. Ruzzi, F. Savo, M. Schmidt, A. Soylu, A. Waaler, and D. Zheleznyakov. Optique: OBDA Solution for Big Data. In Poster track of the Extended Semantic Web Conference (ESWC 2013). Montpellier, France. May 26-30, 2013. Poster. [pdf]
  138. D. Calvanese, M. Giese, P. Haase, I. Horrocks, T. Hubauer, Y. Ioannidis, E. Jiménez-Ruiz, E. Kharlamov, H. Kllapi, J. Klüwer, M. Koubarakis, S. Lamparter, R. Möller, C. Neuenstadt, T. Nordtveit, Ö. Özcep, R. M. driguez Muro, M. Roshchin, M. Ruzzi, F. Savo, M. Schmidt, A. Soylu, A. Waaler, and D. Zheleznyakov. The Optique Project: Towards OBDA Systems for Industry. In OWL Experiences and Directions Workshop (OWLED 2013). Montpellier, France. May 26-30, 2013. Short paper. [pdf]
  139. H. Kllapi, D. Bilidas, I. Horrocks, Y. Ioannidis, E. Jiménez-Ruiz, E. Kharlamov, M. Koubarakis, and D. Zheleznyakov. Distributed Query Processing on the Cloud: the Optique Point of View. In OWL Experiences and Directions Workshop (OWLED 2013). Montpellier, France. May 26-30, 2013. Short paper. [pdf]
  140. I. Horrocks, T. Hubauer, E. Jiménez-Ruiz, E. Kharlamov, M. Koubarakis, R. Möller, K. Bereta, C. Neuenstadt, Ö. Özçep, M. Roshchin, P. Smeros, and D. Zheleznyakov. Addressing Streaming and Historical Data in OBDA Systems: Optique’s Approach. In Workshop on Knowledge Discovery and Data Mining Meets Linked Open Data (Know@LOD 2013). Montpellier, France. May 26-30, 2013. [pdf]
  141. Paolo Mazzetti, Bernard Valentin, Manolis Koubarakis, and Stefano Nativi. Extending netCDF and CF conventions to support enhanced Earth Observation Ontology services: the Prod-Trees project. In the European Geosciences Union (EGU) General Assembly. Vienna, Austria. April 07-12 2013. Poster.
  142. M. Koubarakis, C. Kontoes, S. Manegold, M. Karpathiotakis, K. Kyzirakos, K. Bereta, G. Garbis, C. Nikolaou, D. Michail, I. Papoutsis, T. Herekakis, M. Ivanova, Y. Zhang, H. Pirk, M. Kersten, K. Dogani, S. Giannakopoulou and P. Smeros. Real-Time Wildfire Monitoring Using Scientific Database and Linked Data Technologies. In the 16th International Conference on Extending Database Technology (EDBT 2013). Genoa, Italy. March 18-22, 2013. [pdf]
  143. Z. Kaoudi and M. Koubarakis. Distributed RDFS Reasoning Over Structured Overlay Networks. In Journal on Data Semantics. [link]

    144. 2012

  144. K. Kyzirakos, M. Karpathiotakis and M. Koubarakis. Strabon: A Semantic Geospatial DBMS. In the 11th International Semantic Web Conference (ISWC 2012). November 11-15, 2012. Boston, USA. [pdf]
  145. K. Kyzirakos, M. Karpathiotakis, G. Garbis, C. Nikolaou, K. Bereta, M. Sioutis, I. Papoutsis, T. Herekakis, D. Michail, M. Koubarakis, and C. Kontoes. Real Time Fire Monitoring Using Semantic Web and Linked Data Technologies. In the 11th International Semantic Web Conference (ISWC 2012). November 11-15, 2012. Boston, USA. Demo Paper. [pdf]
  146. C. Nikolaou and M. Koubarakis. Querying Linked Geospatial Data with Incomplete Information. In the 5th International Terra Cognita Workshop 2012 - Foundations, Technologies and Applications of the Geospatial Web. In conjunction with the 11th International Semantic Web Conference. November 11-15, 2012. Boston, USA. [pdf]
  147. M. Sioutis and M. Koubarakis. Consistency of Chordal RCC-8 Networks. In the 24th IEEE International Conference on Tools with Artificial Intelligence. November 7-9, 2012. Athens, Greece. [pdf]
  148. Dave Kolas, Matthew Perry, Rolf Grütter and Manolis Koubarakis. Proceedings of the workshop: "Terra Cognita 2012: Foundations, Technologies and Applications of the Geospatial Web". In conjunction with the 11th International Semantic Web Conference (ISWC 2012). Boston, USA. November 12, 2012. Available at http://ceur-ws.org/Vol-901.
  149. M. Koubarakis, M. Sioutis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, S.Vassos, G. Garbis, K. Bereta, M. Datcu, G. Schwarz, O.C. Dumitru, D.E. Molina and K. Molch. Building Virtual Earth Observatories Using Ontologies, Linked Geospatial Data and Knowledge Discovery Algorithms. Informal Proceedings of the Image Information Mining Conference: Knowledge Discovery from Earth Observation Data (ESA-EUSC-JRC 2012). October 24-26, 2012. Oberpfaffenhofen, Germany. [pdf]
  150. M. Koubarakis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, S. Vassos, G. Garbis, M. Sioutis, K. Bereta, C. Kontoes, I. Papoutsis, T. Herekakis, D. Michail, S. Manegold, M. Kersten, M. Ivanova, H. Pirk, Y. Zhang, M. Datcu, G. Schwarz, O. C. Dumitru, D. E. Molina, K. Molch, U. D. Giammatteo, M. Sagona, S. Perelli, T. Reitz, E. Klien and R. Gregor. Building Remote Sensing Applications Using Scientific Database and Semantic Web Technologies. Informal Proceedings of the Image Information Mining Conference: Knowledge Discovery from Earth Observation Data (ESA-EUSC-JRC 2012). October 24-26, 2012. Oberpfaffenhofen, Germany. [pdf]
  151. M. Koubarakis, M. Karpathiotakis, K. Kyzirakos, C. Nikolaou, S. Vassos, G. Garbis, M. Sioutis, K. Bereta, S. Manegold, M. Kersten, M. Ivanova, H. Pirk, Y. Zhang, C. Kontoes, I. Papoutsis, T. Herekakis, D. Mihail, M. Datcu, G. Schwarz, O. Dumitru, D. Molina, K. Molch, U. Giammatteo, M. Sagona, S. Perelli, E. Klien, T. Reitz, and R. Gregor. Building Virtual Earth Observatories using Ontologies and Linked Geospatial Data. In the 6th International Conference on Web Reasoning and Rule Systems (RR 2012). September 10-12, 2012. Vienna, Austria. Short paper. [pdf]
  152. M. Koubarakis, M. Sioutis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, S. Vassos, G. Garbis, K. Bereta, O. C. Dumitru, D. E. Molina, K. Molch, G. Schwarz, and M. Datcu. Building Virtual Earth Observatories using Ontologies, Linked Geospatial Data and Knowledge Discovery Algorithms. In the 11th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE 2012). September 11-12, 2012. Roma, Italy. [pdf]
  153. M. Koubarakis, M. Karpathiotakis, K. Kyzirakos, C. Nikolaou, and M. Sioutis. Data Models and Query Languages for Linked Geospatial Data. Invited tutorial at the 8th Reasoning Web Summer School 2012 (RW 2012). September 3-8, 2012. Austria, Vienna. In: Eiter, T., Krennwallner, T. (eds.) Reasoning Web. Semantic Technologies for Advanced Query Answering. Lecture Notes in Computer Science, vol. 7487, pp. 290328. Springer. [pdf]
  154. I. Miliaraki and M. Koubarakis. FoXtrot: Distributed Structural and Value XML filtering. In the ACM Transactions on the Web (TWEB). September 2012. [pdf]
  155. Almpanoudi Ira, Bampatzia Stavroula, Antoniou Angeliki, Lepouras Georgios, Koubarakis Manolis. An educational application for the Sanctuary of Artemis at Brauron. In 8th Pan-Hellenic Conference "ICT in Education". 28-30 September 2012, University of Thessaly, Volos, Greece. [pdf in greek]
  156. M. Koubarakis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, S. Vassos, G. Garbis, M. Sioutis, Konstantina Bereta, D. Michail, C. Kontoes, I. Papoutsis, T. Herekakis, S. Manegold, M. Kersten, M. Ivanova, H. Pirk, Y. Zhang, M. Datcu, G. Schwarz, C. Dumitru, D. E. Molina, K. Molch, U. D. Giammatteo, M. Sagona, S. Perelli, T. Reitz, E. Klien, R. Gregor. TELEIOS: A Database-Powered Virtual Earth Observatory. In the 38th International Conference on Very Large Databases (VLDB 2012). August 27-31, 2012. Istanbul, Turkey. Demo Paper. [pdf]
  157. C. Kontoes, I. Keramitsoglou, I. Papoutsis, D. Michail, T. Herekakis, P. Xofis, M. Koubarakis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, M. Sioutis, G Garbis, S. Vassos, S. Manegold, M. Kersten, H. Pirk, M. Ivanova. Operational Wildfire Monitoring and Disaster Management Support Using State-of-the-art EO and Information Technologies. In 2nd International Workshop on Earth Observation and Remote Sensing Applications (EORSA 2012). June 8-11, 2012. Shangai, China. [pdf]
  158. Lefteris Zervakis, Christos Tryfonopoulos, Antionios Papadakis-Pesaresi, Manolis Koubarakis, and Spiros Skiadopoulos. Full-text Support for Publish/Subscribe Ontology Systems, 9th Extended Semantic Web Conference (ESWC 2012). Heraklion, Crete, Greece. May 27th - 31st, 2012. Poster. [pdf]
  159. V. Anastassiou, P. Diamantopoulos, S. Vassos and M. Koubarakis. iThink: A Library for Classical Planning in Video-games. In LNCS 7297, Artificial Intelligence: Theories and Applications - Proceedings of the 7th Hellenic Conference on Artificial Intelligence (SETN) Lamia, Greece. May, 2012. [pdf]
  160. C. Kontoes, I. Papoutsis, D. Michail, T. Herekakis, M. Koubarakis, K. Kyzirakos, M.Karpathiotakis, C. Nikolaou, M. Sioutis, G. Garbis, S. Vassos, I. Keramitsoglou, M. Kersten, S. Manegold, and H. Pirk. Wildfire monitoring via the integration of remote sensing with innovative information technologies. In EGU General Assembly 2012. April 22-27, 2012. Vienna, Austria. Abstract. [pdf]

    161. 2011

  161. Rolf Grütter, Dave Kolas, Manolis Koubarakis and Dieter Pfoser (eds.) Proceedings of the workshop "Terra Cognita 2011: Foundations, Technologies and Applications of the Geospatial Web". In conjunction with the International Semantic Web Conference (ISWC2011). Bohn, Germany. October 23, 2011. CEUR Workshop Proceedings. Available at http://ceur-ws.org/Vol-798/.
  162. Alasdair J. G. Gray, Raúl García-Castro, Kostis Kyzirakos, Manos Karpathiotakis, Jean-Paul Calbimonte, Kevin Page, Jason Sadler, Alex Frazer, Ixent Galpin, Alvaro A. A. Fernandes, Norman W. Paton, Oscar Corcho, Manolis Koubarakis, David De Roure, Kirk Martinez and Asunción Gómez-Pérez. A Semantically Enabled Service Architecture for Mashups over Streaming and Stored Data. In 8th Extended Semantic Web Conference (ESWC 2011). Heraklion, Crete, May 20 - June 2, 2011. [pdf]
  163. Manolis Koubarakis, Kostis Kyzirakos, Manos Karpathiotakis, Charalampos Nikolaou, Michael Sioutis, Stavros Vassos, Dimitrios Michail, Themistoklis Herekakis, Charalampos Kontoes and Ioannis Papoutsis. Challenges for Qualitative Spatial Reasoning in Linked Geospatial Data. In Proceedings of IJCAI 2011 Workshop on Benchmarks and Applications of Spatial Reasoning. Barcelona, Spain, July 17, 2011. [pdf]
  164. A. Katifori, C. Nikolaou, M. Platakis, Y. Ioannidis, A. Tympas, M. Koubarakis, N. Sarris, V. Tountopoulos, E. Tzoanos, S. Bykau, N. Kiyavitskaya, C. Tsinaraki, Y. Velegrakis. The Papyrus Digital Library: Discovering History in the News. Proceeding of the International Conference on Theory and Practice of Digital Libraries (TPDL 2011). Berlin, Germany, September, 2011, Demo paper. [pdf]
  165. A.J.G. Gray, J. Sadler, O. Kit, K. Kyzirakos, M. Karpathiotakis, J.-P. Calbimonte, K. Page, R. García-Castro, A. Frazer, I. Galpin, A.A.A. Fernandes,N.W. Paton, O. Corcho, M. Koubarakis, D.D. Roure, K. Martinez, A. Góoacute;mez-Pérez. A Semantic Sensor Web for Environmental Decision Support Applications. Sensors. 11, 8855-8887. [pdf]

    166. 2010

  166. Zoi Kaoudi, Kostis Kyzirakos, and Manolis Koubarakis. SPARQL Query Optimization on Top of DHTs. In 9th International Semantic Web Conference (ISWC 2010). Shangai, China, November 7-11, 2010. [pdf]
  167. Zoi Kaoudi, Manolis Koubarakis, Kostis Kyzirakos, Iris Miliaraki, Matoula Magiridou and Antonios Papadakis-Pesaresi. Atlas: Storing, updating and querying RDF(S) data on top of DHTs. Web Semantics: Science, Services and Agents on the World Wide Web Journal of Web Semantics. Vol. 8, Issue 4, pages 271-277, 2010. [link]
  168. Kostis Kyzirakos, Manos Karpathiotakis and Manolis Koubarakis. Developing Registries for the Semantic Sensor Web using stRDF and stSPARQL (short paper). 3rd International workshop on Semantic Sensor Networks 2010, in conjunction with ISWC 2010, November 2010, Shanghai, China. [pdf]
  169. Iris Miliaraki and Manolis Koubarakis. Distributed Structural and Value XML Filtering. Proceedings of the 4th ACM International Conference on Distributed Event-Based Systems (DEBS 2010). Cambridge, United Kingdom, July 12-15, 2010. [pdf]
  170. Manolis Koubarakis and Kostis Kyzirakos. Modeling and Querying Metadata in the Semantic Sensor Web: the Model stRDF and the Query Language stSPARQL. In 7th Extended Semantic Web Conference (ESWC 2010). Heraklion, Crete, 30 May - 03 June, 2010. [pdf]
  171. Manolis Platakis, Charalampos Nikolaou, Akrivi Katifori, Manolis Koubarakis and Yannis Ioannidis. Browsing news archives from the perspective of history: the Papyrus browser historiographical issues view. 11th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2010). Desenzano del Garda, Italy. [pdf]

    172. 2009

  172. Oscar Corcho, Manfred Hauswirth and Manolis Koubarakis (eds). Proceedings of the 1st Workshop on the Semantic Sensor Web (SemSensWeb2009). Collocated with the Extended Semantic Web Conference 2009. Heraklion, Crete, Greece. June 1st, 2009. CEUR Workshop Proceedings. Available at http://ceur-ws.org/Vol-468/.
  173. M. Koubarakis. Telos. Encyclopedia of Database Systems, Ling Liu and M. Tamer Ozsu (editors), Springer, September 2009. [pdf]
  174. C. Tryfonopoulos, M. Koubarakis and Y. Drougas. Information Filtering and Query Indexing for an Information Retrieval Model. ACM Transactions on Information Systems , Vol. 27, No. 2, 2009. [pdf]
  175. V. K. Chaudhri, I. Jurisica, M. Koubarakis, D. Plexousakis and T. Topaloglou. The KBMS project and beyond. In "Conceptual Modeling: Foundations and Applications. Essays in Honor of John Mylopoulos", Lecture Notes in Computer Science 5600, pages 467-482, Springer, 2009. [pdf]

    176. 2008

  176. Zoi Kaoudi, Iris Miliaraki and Manolis Koubarakis. RDFS Reasoning and Query Answering on Top of DHTs. In 7th International Semantic Web Conference (ISWC 2008). Karlsruhe, Germany, October 26-30, 2008. [pdf]
  177. Christian Zimmer, Christos Tryfonopoulos, Klaus Berberich, Manolis Koubarakis, and Gerhard Weikum. Approximate Information Filtering in Peer-to-Peer Networks. Proceedings of the 9th International Conference on Web Information Systems Engineering (WISE 2008). Lecture Notes in Computer Science, vol. 5175, pages 6-19, Springer. September 1-2, Auckland, New Zealand. [pdf]
  178. Sean Bechhofer, Manfred Hauswirth, Joerg Hoffmann and Manolis Koubarakis (eds). The Semantic Web: Research and Applications. Proceedings of the 5th European Semantic Web Conference, ESWC 2008, Tenerife, Canary Islands, Spain, June 1-5, 2008. Lecture Notes in Computer Science volume 5021, Springer.
  179. Iris Miliaraki, Zoi Kaoudi and Manolis Koubarakis. XML Data Dissemination using Automata on top of Structured Overlay Networks. Proceedings of the 17th International World Wide Web Conference (WWW 2008), Beijing, China, April 21-25, 2008.[pdf]
  180. S. Idreos, E. Liarou and M. Koubarakis. Continuous Multiway Joins over Distributed Hash Tables. In Proceedings of 11th International Conference on Extending Database Technology (EDBT 2008). March 25-30 2008, Nantes, France. [pdf]

    181. 2007

  181. Erietta Liarou, Stratos Idreos and Manolis Koubarakis. Continuous RDF Query Processing over DHTs. Proceedings of the 6th International Semantic Web Conference (ISWC). Busan, Korea. November 11-15, 2007. [pdf]
  182. Christos Tryfonopoulos, Christian Zimmer, Manolis Koubarakis and Gerhard Weikum. Architectural Alternatives for Information Filtering in Structured Overlays, IEEE Internet Computing, Vol. 11, No. 4, July-August 2007, pages 24-34. [pdf]
  183. Christian Zimmer, Christos Tryfonopoulos, Klaus Berberich, Gerhard Weikum and Manolis Koubarakis. Node Behavior Prediction for Large-Scale Approximate Information Filtering. In Proceedings of the International Workshop on Large-Scale Distributed Systems for Information Retrieval (LSDS-IR), Amsterdam, The Netherlands, July 2007. [pdf]
  184. Z. Kaoudi, M. Koubarakis, K. Kyzirakos, M. Magiridou, I. Miliaraki, and A. Papadakis-Pesaresi. Publishing, Discovering and Updating Semantic Grid Resources using DHTs. CoreGRID Workshop on Grid Programming Model, Grid and P2P Systems Architecture, Grid Systems, Tools and Environments. Heraklion, Crete, Greece. June 12-13, 2007. [pdf]
  185. Spiros Skiadopoulos, Nikos Sarkas, Timos Sellis and Manolis Koubarakis A family of directional relation models for extended regions, IEEE Transactions on Knowledge & Data Engineering, Vol. 19, No. 8, August 2007. [pdf]
  186. Z. Kaoudi, I. Miliaraki, M. Magiridou, E. Liarou, S. Idreos, M. Koubarakis, Semantic Grid Resource Discovery using DHTs in Atlas. In "Knowledge and Data Management in Grids", Talia Domenico, Bilas Angelos, and Dikaiakos Marios D.(editors), Springer, 2007. [pdf]

    187. 2006

  187. Manolis Koubarakis, Spiros Skiadopoulos and Christos Tryfonopoulos Logic and Computational Complexity for Boolean Information Retrieval , IEEE Transactions on Knowledge & Data Engineering, Vol. 18, No. 12. pp. 1659-1666. December 2006. [pdf]
  188. E. Liarou, S. Idreos and M. Koubarakis, Evaluating Conjunctive Triple Pattern Queries over Large Structured Overlay Networks, Proceedings of the 5th International Semantic Web Conference (ISWC), Athens, GA, USA, November 5-9, 2006 [pdf]
  189. Klaus Berberich, Manolis Koubarakis, Christos Tryfonopoulos, Gerhard Weikum, Christian Zimmer, MAPS: Approximate Publish/Subscribe Functionality in Peer-to-Peer Networks, in Proceedings of Advanced Data Processing in Ubiquitous Computing Workshop (ADPUC), Melbourne, Australia, November 2006 [pdf].
  190. M. Koubarakis. Temporal CSPs. Chapter 19 of Handbook of Constraint Programming, F. Rossi, P. Van Beek and T. Walsh (eds.). Elsevier, August 2006. [pdf]
  191. Z. Kaoudi, I. Miliaraki, M. Magiridou, A. Papadakis-Pesaresi and M. Koubarakis, Storing and Querying RDF Data in Atlas, 3rd European Semantic Web Conference, 11 - 14 June 2006, Budva, Montenegro, Demo paper. [pdf]
  192. Stratos Idreos, Christos Tryfonopoulos, Manolis Koubarakis, Distributed Evaluation of Continuous Equi-join Queries over Large Structured Overlay Networks. In Proceedings of the 22nd International Conference on Data Engineering (ICDE), Atlanta, USA, April 2006. [pdf]
  193. M. Koubarakis, I. Miliaraki, Z. Kaoudi, M. Magiridou and A. Papadakis-Pesaresi, Semantic Grid Resource Discovery using DHTs in Atlas, 3rd GGF Semantic Grid Workshop, 13-16 February 2006, Athens, Greece. [pdf]
  194. P.-A. Chirita, S. Idreos, M. Koubarakis, and W. Nejdl. Designing Semantic Publish/Subscribe Networks Using Super-Peers. In "Semantic Web and Peer-to-Peer", Steffen Staab and Heiner Stuckenschmidt (editors), Springer, 2006. [pdf]

    195. 2005

  195. Matoula Magiridou, Stavros Sahtouris, Vassilis Christophides and Manolis Koubarakis, RUL: A Declarative Update Language for RDF, In Proceedings of the 4th International Semantic Web Conference (ISWC), Galway, Ireland, November 6-10, 2005. [pdf]
  196. Christos Tryfonopoulos, Stratos Idreos, and Manolis Koubarakis, LibraRing: An Architecture for Distributed Digital Libraries Based on DHTs. In Proceedings of the 9th European Conference on Research and Advanced Technology for Digital Libraries (ECDL), pages 25-36, Vienna, Austria, September 2005. DELOS Research Exchange Award [pdf]
  197. Manolis Koubarakis, Zoi Kaoudi and Iris Miliaraki, Semantic Grid Service Discovery using DHTs, Extended Abstract. Proceedings of the 1st CoreGrid WP2 Workshop on Knowledge and Data Management. September 13-14, 2005. Poznan, Poland. [pdf]
  198. Christos Tryfonopoulos, Stratos Idreos, and Manolis Koubarakis, Publish/Subscribe Functionality in IR Environments using Structured Overlay Networks. In Proceedings of the 28th Annual International ACM SIGIR Conference, Salvador, Brazil, August 2005. [pdf]
  199. E. Liarou, S. Idreos and M. Koubarakis, Publish/Subscribe with RDF Data over Large Structured Overlay Networks. In Proceedings of the 3rd International Workshop on Database, Information Systems and Peer-to-Peer Computing (DBISP2P 2005), in conjunction with VLDB 2005, Trondheim, Norway, August 28-29, 2005. [pdf]
  200. P. Marrow and M. Koubarakis, Self-organising applications using lightweigh agents. Third International Workshop on Engineering Self-Organising Applications (ESOA 2005). Held in conjunction with the 4th International Joint Conference on Autonomous Agents and Multi-Agent Systems (AAMAS 2005), July 2005. Utrecht, The Netherlands. [pdf]
  201. Christos Tryfonopoulos, Stratos Idreos, and Manolis Koubarakis, Publish/Subscribe Functionalities for Future Digital Libraries using Structured Overlay Networks. In Proceedings of the 8th International Workshop of the DELOS Network of Excellence on Digital Libraries on Future Digital Library Management Systems, Schloss Dagstuhl, Germany, March 2005. [pdf]
  202. S. Skiadopoulos and M. Koubarakis, On the Consistency of Cardinal Directions Constraints, Artificial Intelligence, Vol. 163, No. 1, 2005, pp. 91-135. [pdf]
  203. M. Koubarakis, Indefnite Constraint Databases with Temporal Information: Representational Power and Computational Complexity. In M. Fischer, D. Gabbay and L. Villa (eds.) Handbook of Temporal Reasoning in Artificial Intelligence. Volume 1 in the series "Foundations of Artificial Intelligence", B. Nebel, J.Hendler and H. Kitano (eds). Elsevier Science. 2005. [pdf]
  204. P. Raftopoulou, M. Koubarakis, K. Stergiou and P. Triantafillou, Fair Resource Allocation in a Simple Multi-Agent Setting: Search Algorithms and Experimental Evaluation, International Journal of Artificial Intelligence Tools, Vol. 14, No. 6, 2005, pp. 887-899. [ pdf]
  205. S. Skiadopoulos, C. Giannoukos, N. Sarkas, P. Vassiliadis, T. Sellis and M. Koubarakis, Computing and Managing Cardinal Direction Relations, IEEE Transactions on Knowledge and Data Engineering, Vol. 14, No. 6, 2005, pp. 1610-1623. [pdf]

    206. 2004

  206. C. Tryfonopoulos and M. Koubarakis and Y. Drougas, Filtering Algorithms for Information Retrieval Models with Named Attributes and Proximity Operators, Proceedings of the 27th Annual ACM SIGIR Conference. July 25-July 29, 2004, Sheffield, United Kingdom. [pdf]
  207. M. Koubarakis, Word Proximity Constraints: Information Retrieval meets Temporal Reasoning, Proceedings of the 11th International Symposium on Temporal Representation and Reasoning, Tatihou, Νormandie, France, 1-3 July, 2004. [pdf]
  208. C. Tryfonopoulos and M. Koubarakis, Implementing Publish/Subscribe Systems with Languages from Information Retrieval on Top of Structured Overlay Networks. In Proceedings of the International Workshop on Peer-to-Peer and IR (P2P&IR 2004), Sheffield, UK, July 29, 2004. [pdf]
  209. C. Tryfonopoulos and M. Koubarakis, Publish/Subscribe Systems with Distributed Hash Tables and Languages from Information Retrieval. In Proceedings of the 6th Workshop on Distributed Data and Structures (WDAS 2004), Lausanne, Switzerland, July 5-7, 2004. [pdf]
  210. M. Koubarakis and C. Tryfonopoulos, Distributed Resource Sharing using Self-Organized Peer-to-Peer Networks and Languages from Information Retrieval, Invitational Workshop on Self-* Properties in Complex Information Systems. Bertinoro, Italy, 31 May and 2 June, 2004. [pdf]
  211. S. Idreos, M. Koubarakis and C. Tryfonopoulos, P2P-DIET: An Extensible P2P Service that Unifies Ad-hoc and Continuous Querying in Super-peer Networks, Proceedings of the ACM SIGMOD/PODS 2004 Conference. Maison de la Chimie, Paris, France, June 13-18, 2004, Demo paper. [pdf]
  212. S. Idreos and M. Koubarakis, P2P-DIET: Ad-hoc and Continuous Queries in Peer-to-Peer Networks using Mobile Agents, 3rd Hellenic Conference in Artificial Intelligence, Samos, Greece, May 5-8, 2004. In LNAI, Vol. 3025, pages 23-32. [pdf]
  213. P.-A. Chirita, S. Idreos, M. Koubarakis, and W. Nejdl, Publish/Subscribe for RDF-based P2P Networks, Proceedings of the 1st European Semantic Web Symposium (ESWS 2004), Heraklion, Crete, Greece, May 10-12, 2004. In LNCS, Vol. 3053, pages 182-197. [pdf]
  214. Stratos Idreos, Manolis Koubarakis and Christos Tryfonopoulos. P2P-DIET: One-Time and Continuous Queries in Super-peer Networks. Proceedings of the IX International Conference on Extending Database Technology (EDBT04), Heraklion, Crete, Greece, March 14-18, 2004. In LNCS, Vol. 2992, pages 851-853, Demo paper. [pdf]
  215. S. Skiadopoulos, C. Giannoukos, P. Vassiliadis, T. Sellis and M. Koubarakis. Computing and Handling Cardinal Direction Information. Proceedings of IX International Conference on Extending Database Technology (EDBT04), Heraklion, Crete, Greece, March 14-18, 2004. [pdf]
  216. S. Idreos, C. Tryfonopoulos, M. Koubarakis and Y. Drougas, Query Processing in Super-Peer Networks with Languages Based on Information Retrieval: the P2P-DIET Approach, International Workshop on Peer-to-Peer Computing and Data Bases (P2P&DB 2004), Heraklion, Crete, Greece, March 14, 2004. In LNCS 3268 (Current Trends in Database Technology - EDBT 2004 Workshops - Revised Selected Papers), Springer. [pdf]
  217. S. Skiadopoulos and M. Koubarakis, Composing Cardinal Direction Relations, Artificial Intelligence, Vol. 152, No. 2, February 2004, pages 143-171. [pdf]
  218. E. Bertino, S. Christodoulakis, D. Plexousakis, V. Christophides, M. Koubarakis, K. Böhm, and E. Ferrari (Eds.), Advances in Database Technology, Proceedings of the 9th International Conference on Extending Database Technology (EDBT 2004), Heraklion, Crete, Greece, March 14-18, 2004, . Lecture Notes in Computer Science, Vol. 2992, Springer.
  219. K. Aberer, M. Koubarakis and V. Kalogeraki, Databases, Information Systems and Peer-to-Peer Computing, (Proceedings of International Workshop, DBISP2P 2003), Lecture Notes in Computer Science, Vol. 2944, Springer.

    220. 2003

  220. M. Koubarakis, C. Tryfonopoulos, S. Idreos and Y. Drougas, Selective Information Dissemination in P2P Networks: Problems and Solutions, ACM SIGMOD Record, Special issue on Peer-to-Peer Data Management, Karl Aberer (editor), Volume 32, Number 3, September 2003. [pdf]
  221. M. Koubarakis, Multi-Agent Systems and P2P Computing: Methods, Systems and Challenges (Invited talk), Proceedings of the 7th International Workshop on Cooperative Information Agents (CIA 2003), Helsinki, Finland, August 27-29, 2003. In LNAI, Vol. 2782, pages 46-61, Springer. [pdf]
  222. M. Koubarakis, T. Sellis, A. Frank, S. Grumbach, R. H. Güting, C. Jensen, N. Lorentzos, Y. Manolopoulos, E. Nardelli, B. Pernici, Hans-Jörg Schek, M. Scholl, B. Theodoulidis and N. Tryfona (eds.) Spatiotemporal Databases: The Chorochronos Approach, Lecture Notes in Computer Science, Vol. 2520, June 2003, Springer.
  223. G. Moro and M. Koubarakis, Agents and Peer-to-Peer Computing (Proceedings of First International Workshop, AP2PC 2002), Lecture Notes in Computer Science, Springer, Vol. 2530, June 2003.
  224. S. Grumbach, M. Koubarakis, M. Scholl, P. Rigaux and S. Skiadopoulos, Spatiotemporal models and languages: an approach based on constraints. In M. Koubarakis, T. Sellis et. al. Spatiotemporal Databases: The Chorochronos Approach, Lecture Notes in Computer Science, Vol. 2520, June 2003, Springer. [pdf]
  225. M. Koubarakis and T. Sellis, Introduction, In M. Koubarakis, T. Sellis et. al. (eds.) Spatiotemporal Databases: The Chorochronos Approach, Lecture Notes in Computer Science, Vol. 2520, pages 1-5, June 2003, Springer. [pdf]
  226. M. Koubarakis, Y. Theodoridis and T. Sellis, Spatio-temporal Databases in the Years Ahead, In M. Koubarakis, T. Sellis et. al. (eds.) Spatiotemporal Databases: The Chorochronos Approach, Lecture Notes in Computer Science, Vol. 2520, pages 289-290, June 2003, Springer. [pdf]
  227. P. Triantafillou, C. Xiruhaki, M. Koubarakis and N. Ntarmos, Towards High-Performance Peer-to-Peer Content and Resource Sharing Systems. In First Biennial Conference on Innovative Data Systems Research (CIDR 2003), January 5-9, Pacific Grove, California, U.S.A. [pdf]

    228. 2002

  228. M. Koubarakis and C. Tryfonopoulos, Peer-to-peer agent systems for textual information dissemination: algorithms and complexity. In UK Workshop on Multiagent Systems (UKMAS-2002), Liverpool, UK, 18 & 19 December, 2002. [pdf]
  229. M. Koubarakis, Querying Temporal Constraint Networks: A Unifying Approach. Applied Intelligence,Vol. 17, No. 3, pages 297-311, November-December 2002. [pdf]
  230. M. Koubarakis, C. Tryfonopoulos, P. Raftopoulou, T. Koutris, Data Models and Languages for Agent-Based Textual Information Dissemination. 6th International Workshop on Cooperative Information Systems (CIA 02), 18-20 September 2002, Universidad Rey Juan Carlos, Madrid, Spain. [pdf] [long version(zipped)]
  231. M. Koubarakis, T. Koutris, C. Tryfonopoulos, P. Raftopoulou, Information Alert in Distributed Digital Libraries: The Models, Languages and Architecture of DIAS. 6th European Conference on Research and Advanced Technology for Digital Libraries (ECDL 02), 16-18 September 2002, Pontifical Gregorian University, Rome, Italy. [pdf]
  232. M. Koubarakis and D. Plexousakis, A Formal Framework for Business Process Modeling and Design. Information Systems, Vol. 27, No. 5, pages 299-319, July 2002. [gzipped postscript]
  233. Peter Triantafillou, Chryssani Xiruhaki and Manolis Koubarakis, Efficient Massive Sharing of Content among Peers. IEEE Workshop on Resource Sharing in Massively Distributed Systems (RESH'02), July 2, 2002, Vienna, Austria. [pdf]
  234. M. Koubarakis, Textual Information Dissemination in Distributed Event-Based Systems. Proceedings of the International Workshop on Distributed Event-Based systems (DEBS'02), July 2-3, 2002, Vienna, Austria. [gzipped postscript]
  235. A. Gallardo-Antolin, A. Navia-Vasquez, H. Y. Molina-Bulla, A.B. Rodriguez-Gonzalez, F. J. Valverde-Albacete, J. Cid-Sueiero, A.R. Figuieras-Vidal, T. Koutris, C. Xiruhaki and M. Koubarakis, I-Gaia: an Information Processing Layer for the DIET Platform. Proceedings of the 1st International Conference on Autonomous Agents and Multi-Agent Systems (AAMAS2002), Bologna, Italy, July 2002. [pdf]
  236. M. Koubarakis, T. Koutris, P. Raftopoulou and C. Tryfonopoulos, Efficient Agent-Based Dissemination of Textual Information, 2nd Hellenic Conference on Artificial Intelligence (SETN 02), 11 - 12 April 2002, Thessaloniki, Greece. Poster. [pdf]
  237. S. Skiadopoulos and M. Koubarakis. Composition Algorithms for Cardinal Direction Relations. 2nd Hellenic Conference on Artificial Intelligence (SETN 02), 11 - 12 April 2002, Thessaloniki, Greece. Poster.
  238. T. Finin, M. Koubarakis and Y. Labrou (eds.) Special Issue on Intelligent Information Agents in the Internet and WWW Age. International Journal on Artificial Intelligence Tools, Vol. 11, No. 2, March 2002.
  239. S. Skiadopoulos, M. Koubarakis, Consistency Checking for Qualitative Spatial Reasoning with Cardinal Directions. CP 2002, pages 341-355. [gzipped ps]

    240. 2001

  240. M. Koubarakis, Boolean Queries with Proximity Operators for Information Dissemination. Proceedings of the workshop on Foundations of Models and Languages for Information Integration (FMII-2001), Viterbo, Italy , 16-18 September, 2001. [gzipped postscript]
  241. M. Koubarakis, Tractable Disjunctions of Linear Constraints: Basic Results and Applications to Temporal Reasoning, Theoretical Computer Science, Vol. 266, pages 311-339, September 2001. [gzipped postscript]
  242. S. Skiadopoulos and M. Koubarakis, Composing Cardinal Direction Relations, Proceedings of the 7th International Symposium on Spatial and Temporal Databases (SSTD-2001), Los Angeles, California, July 12-15, 2001. [gzipped postscript]
  243. P. Marrow, M. Koubarakis, R.H. van Lengen, F. Valverde-Albacete, E. Bonsma, J. Cid-Suerio, A.R. Figueiras-Vidal, A. Gallardo-Antolin, C. Hoile, T. Koutris, H. Molina-Bulla, A. Navia-Vazquez, P. Raftopoulou, N. Skarmeas, C. Tryfonopoulos, F. Wang, C. Xiruhaki, Agents in Decentralised Information Ecosystems: The DIET Approach. Symposium on Information Agents for E-Commerce, AISB'01 Convention, 21st - 24th March 2001 University of York, United Kingdom. [pdf]

    244. 2000

  244. D. Cohen, P. Jeavons, P. Jonsson and M. Koubarakis, Building Tractable Disjunctive Constraints, Journal of ACM, Vol. 47, No. 5, pages 826-853, September 2000. [gzipped postscript]
  245. M. Koubarakis and D. Plexousakis, A Formal Model for Business Process Modeling and Design, Proceedings of CAiSE*00, Stockholm, Sweden, June 5-9, 2000. [gzipped postscript]
  246. M. Koubarakis and S. Skiadopoulos, Querying temporal and spatial constraint networks in PTIME. Artificial Intelligence, Vol. 123, No. 1-2, pages 223-263, 2000. [gzipped postscript]
  247. K. Stergiou and M. Koubarakis, Backtracking Algorithms for Disjunctions of Temporal Constraints, Artificial Intelligence, Vol. 120 (1) (2000) pp. 81-117. [pdf]

    248. 1999

  248. Koubarakis, M. and Plexousakis, D., Business Process Modeling and Design: A Formal Model and Methodology, BT Technology Journal, special issue on the emerging enterprise, Vol. 17, No. 4, pp. 23-35, October 1999. [pdf]
  249. Koubarakis, M. and Skiadopoulos, S., Querying Indefinite Temporal and Spatial Information: A New Frontier, Proceedings of the IJCAI-99 Workshop on Hot Topics in Temporal and Spatial Reasoning, Stockholm, Sweden, August 2, 1999. [gzipped postscript]
  250. Koubarakis, M. and Plexousakis, D., Business Process Modeling and Design: AI Models and Methodology, Proceedings of the IJCAI-99 Workshop on Intelligent Workflow and Process Management: The New Frontier for AI in Business, Stockholm, Sweden, August 1-2, 1999. [gzipped postscript]
  251. M. Koubarakis and S. Skiadopoulos, Querying Temporal Constraint Networks in PTIME, Proceedings of AAAI-99. Orlando, Florida, July 18-22, 1999. [gzipped postscript]
  252. Andrew U. Frank, Stephane Grumbach, Ralf Hartmut Guting, Christian S. Jensen, Manolis Koubarakis, Nikos A. Lorentzos, Yannis Manolopoulos, Enrico Nardelli, Barbara Pernici, Hans-Jorg Schek, Michel Scholl, Timos K. Sellis, Babis Theodoulidis and Peter Widmayer, Chorochronos: A Research Network for Spatiotemporal Database Systems, ACM SIGMOD Record, Vol. 28, No. 3, pages 12-21, 1999. [pdf]
  253. M. Koubarakis and S. Skiadopoulos, Tractable Query Answering in Indefinite Constraint Databases: Basic Results and Applications to Querying Spatio-Temporal Information. In Spatio-Temporal Database Management (Proceedings of the International Workshop STDBM'99), Lecture Notes in Computer Science, Vol. 1678, Bohlen, M.H. and Jensen, C. and Scholl, M. (eds.), pages 204-223, Springer, 1999. [pdf]

    254. 1998

  254. K. Stergiou and M. Koubarakis, Backtracking Algorithms for Disjunctions of Temporal Constraints, Proceedings of AAAI-98, pages 248-253. Madison, Wisconsin, July 26-30, 1998. [gzipped postscript]

    255. 1997

  255. M. Koubarakis, From Local to Global Consistency in Temporal Constraint Networks, Theoretical Computer Science, Vol. 173, pages 89-112, February 1997. Invited submission to the special issue for the 1st International Conference on Principles and Practice of Constraint Programming (CP95), Editors: U. Montanari and F. Rossi. [gzipped postscript]
  256. M. Koubarakis, The Complexity of Query Evaluation in Indefinite Temporal Constraint Databases, Theoretical Computer Science, Vol. 171, pages 25-60, January 1997. Special Issue on Uncertainty in Databases and Deductive Systems, Editor: L.V.S. Lakshmanan. [gzipped postscript]
  257. D. Cohen, P. Jeavons and M. Koubarakis, Tractable Disjunctive Constraints, Proceedings of the 3rd International Conference on Principles and Practice of Constraint Programming (CP97). Lecture Notes in Computer Science, Vol. 1330, pages 478-490. [gzipped postscript]

    258. 1996

  258. M. Koubarakis, Tractable Disjunctions of Linear Constraints, Proceedings of the 2nd International Conference on Principles and Practice of Constraint Programming (CP96), Lecture Notes in Computer Science, Vol. 1118, pages 297-307. [gzipped postscript]

    259. 1995

  259. M. Koubarakis, Databases and Temporal Constraints: Semantics and Complexity, In Clifford, J. and Tuzhilin, A. (eds.), Recent Advances in Temporal Databases (Proceedings of the International Workshop on Temporal Databases, Zurich, Switzerland, September 1995), Workshops in Computing, Springer, pages 93-109. [gzipped postscript]
  260. M. Koubarakis, From Local to Global Consistency in Temporal Constraint Networks, Proceedings of the 1st International Conference on Principles and Practice of Constraint Programming (CP95), Lecture Notes in Computer Science, Vol. 976, pages 53-69, September 1995. [gzipped postscript]

    261. 1994

  261. D. Papadias, A. Frank and M. Koubarakis, Constraint-Based Reasoning in Geographic Databases: the Case of Symbolic Arrays, Proceedings of the 2nd ICLP Workshop on Deductive Databases and Logic Programming, Santa Margherita Ligure, Italy, June 1994. Published as GMD-Studien Nr. 231, U. Geske, D. Seipel (eds.)
  262. M. Koubarakis, Complexity Results for First-Order Theories of Temporal Constraints, Proceedings of the 4th International Conference on Principles of Knowledge Representation and Reasoning (KR'94), pages 379-390, May 1994. [gzipped postscript]
  263. M. Koubarakis, Database Models for Infinite and Indefinite Temporal Information, Information Systems, Vol. 19, No. 2, March 1994, pages 141-173. [gzipped postscript]
  264. M. Koubarakis, Foundations of Temporal Constraint Databases, Ph.D. thesis, Computer Science Division, Dept. of Electrical and Computer Engineering, National Technical University of Athens, February 1994. [gzipped postscript]
  265. M. Koubarakis, Foundations of Indefinite Constraint Databases, In A. Borning (ed.), Proceedings of the 2nd International Workshop on the Principles and Practice of Constraint Programming (PPCP'94), Lecture Notes in Computer Science vol. 874, pages 266-280, Springer Verlag, 1994. [gzipped postscript]

    266. 1993

  266. M. Koubarakis, Representation and Querying in Temporal Databases: the Power of Temporal Constraints, Proceedings of the 9th International Conference on Data Engineering, pages 327-334, April 1993. [gzipped postscript]
  267. J. Mylopoulos, A. Borgida, M. Jarke and M. Koubarakis, Representing Knowledge About Information Systems in Telos, In M. Jarke (ed.), Database Application Engineering with DAIDA, Springer Verlag, 1993, pages 31-64.

    268. 1992

  268. M. Koubarakis, Dense Time and Temporal Constraints with "not equals", Proceedings of the 3rd International Conference on Principles of Knowledge Representation and Reasoning (KR'92), pages 24-35, October 1992. [gzipped postscript]

    269. 1991

  269. B.M. Kramer, V.K. Chaudhri, M. Koubarakis, T. Topaloglou, H. Wang and J. Mylopoulos, Implementing Telos, SIGART Bulletin, Special Issue on Implemented Knowledge Representation and Reasoning Systems, Vol. 2, No. 3, June 1991, pages 77-83. [pdf]

    270. 1990

  270. J. Mylopoulos, A. Borgida, M. Jarke and M. Koubarakis, Telos: Representing Knowledge about Information Systems, ACM Transactions on Information Systems, Vol. 8, No. 4, October 1990, pages 325-362. [pdf]

    271. 1988

  271. M. Koubarakis, An Implementation of CML (Telos), M.Sc. thesis, Dept. of Computer Science, University of Toronto, January 1988. Not available in electronic form. Instead you can read the basic paper on Telos.