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    2013

  1. I. Miliaraki and M. Koubarakis. FoXtrot: Distributed Structural and Value XML filtering. In the ACM Transactions on the Web (TWEB). Forthcoming. [pdf]


  2. 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]


  3. 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]


  4. 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]


  5. 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]


  6. 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]


  7. 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]


  8. 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]


  9. Z. Kaoudi and M. Koubarakis. Distributed RDFS Reasoning Over Structured Overlay Networks. In Journal on Data Semantics. [link]


    10. 2012

  10. 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]


  11. 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]


  12. 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]


  13. 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]


  14. 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.


  15. 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. In the Image Information Mining Conference: Knowledge Discovery from Earth Observation Data (ESA-EUSC-JRC 2012). October 24-26, 2012. Oberpfaffenhofen, Germany. [pdf]


  16. 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. In the Image Information Mining Conference: Knowledge Discovery from Earth Observation Data (ESA-EUSC-JRC 2012). October 24-26, 2012. Oberpfaffenhofen, Germany. [pdf]


  17. 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]


  18. 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]


  19. 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]


  20. 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]


  21. 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]


  22. 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]


  23. 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]


  24. 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]


  25. 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]


    26. 2011

  26. 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/.


  27. 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]


  28. 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]


  29. 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]


  30. 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. Gómez-Pérez. A Semantic Sensor Web for Environmental Decision Support Applications. Sensors. 11, 8855-8887. [pdf]


    31. 2010

  31. 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]


  32. 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]


  33. 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]


  34. 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]


  35. 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]


  36. 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]


    37. 2009

  37. 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/.


  38. M. Koubarakis. Telos. Encyclopedia of Database Systems, Ling Liu and M. Tamer Ozsu (editors), Springer, September 2009. [pdf]


  39. 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]


  40. 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]


    41. 2008

  41. 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]


  42. 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]


  43. 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.


  44. 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]


  45. 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]


    46. 2007

  46. 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]


  47. 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]


  48. 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]


  49. 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]


  50. 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]


  51. 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]


    52. 2006

  52. 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]


  53. 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]


  54. 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].


  55. M. Koubarakis. Temporal CSPs. Chapter 19 of Handbook of Constraint Programming, F. Rossi, P. Van Beek and T. Walsh (eds.). Elsevier, August 2006. [pdf]


  56. 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]


  57. 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]


  58. 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]


  59. 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]


    60. 2005

  60. 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]


  61. 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]


  62. 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]


  63. 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]


  64. 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]


  65. 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]


  66. 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]


  67. S. Skiadopoulos and M. Koubarakis, On the Consistency of Cardinal Directions Constraints, Artificial Intelligence, Vol. 163, No. 1, 2005, pp. 91-135. [pdf]


  68. 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]


  69. 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]


  70. 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]


    71. 2004

  71. 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]


  72. 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]


  73. 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]


  74. 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]


  75. 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]


  76. 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]


  77. 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]


  78. 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]


  79. 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]


  80. 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]


  81. 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]


  82. S. Skiadopoulos and M. Koubarakis, Composing Cardinal Direction Relations, Artificial Intelligence, Vol. 152, No. 2, February 2004, pages 143-171. [pdf]


  83. 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.


  84. 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.


    85. 2003

  85. 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]


  86. 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]


  87. 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.


  88. 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.


  89. 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]


  90. 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]


  91. 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]


  92. 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]


    93. 2002

  93. 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]


  94. M. Koubarakis, Querying Temporal Constraint Networks: A Unifying Approach. Applied Intelligence,Vol. 17, No. 3, pages 297-311, November-December 2002. [pdf]


  95. 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)]


  96. 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]


  97. 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]


  98. 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]


  99. 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]


  100. 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]


  101. 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]


  102. 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.


  103. 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.


  104. S. Skiadopoulos, M. Koubarakis, Consistency Checking for Qualitative Spatial Reasoning with Cardinal Directions. CP 2002, pages 341-355. [gzipped ps]


    105. 2001

  105. 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]


  106. 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]


  107. 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]


  108. 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]


    109. 2000

  109. 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]


  110. 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]


  111. 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]


  112. K. Stergiou and M. Koubarakis, Backtracking Algorithms for Disjunctions of Temporal Constraints, Artificial Intelligence, Vol. 120 (1) (2000) pp. 81-117. [pdf]


    113. 1999

  113. 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]


  114. 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]


  115. 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]


  116. M. Koubarakis and S. Skiadopoulos, Querying Temporal Constraint Networks in PTIME, Proceedings of AAAI-99. Orlando, Florida, July 18-22, 1999. [gzipped postscript]


  117. 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]


  118. 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]


    119. 1998

  119. 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]


    120. 1997

  120. 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]


  121. 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]


  122. 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]


    123. 1996

  123. 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]


    124. 1995

  124. 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]


  125. 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]


    126. 1994

  126. 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.)


  127. 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]


  128. M. Koubarakis, Database Models for Infinite and Indefinite Temporal Information, Information Systems, Vol. 19, No. 2, March 1994, pages 141-173. [gzipped postscript]


  129. 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]


  130. 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]


    131. 1993

  131. 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]


  132. 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.


    133. 1992

  133. 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]


    134. 1991

  134. 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]


    135. 1990

  135. 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]


    136. 1988

  136. 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.