Publications

Book Chapters

  • Basina Nena, Theodore Patkos, Dimitris Plexousakis, “ECAVI- An Assistant for Reasoning about Actions and Change with the Event Calculus”, Domain-Specific Conceptual Modeling, Vol. 2, 2021
  • Abdelghani Chibani, Antonis Bikakis, Theodore Patkos, Yacine Amirat, Sofiane Bouznad, Naouel Ayari, Lyazid Sabri, “Using Cognitive Ubiquitous Robots for Assisting Dependent People in Smart Spaces”, Intelligent Assistive Robots, Springer Tracts in Advanced Robotics 106, pp 297-316, 2015.

Peer-reviewed Journals, Conferences and Workshops

2021

  • A. Vassiliades, Th. Patkos, G. Flouris, A. Bikakis, N. Bassiliades, D. Plexousakis, “Abstract Argumentation Frameworks with Domain Assignments”. 30th International Joint Conference on Artificial Intelligence (IJCAI-21), pp. 2076-2082, Montreal, Canada, 2021.
  • Alexandros Vassiliades, Nick Bassiliades, and Theodore Patkos, “Argumentation and explainable artificial intelligence: A survey”. The Knowledge Engineering Review, 36, 2021.
  • Katerina Papantoniou, Panagiotis Papadakos, Theodore Patkos, Giorgos Flouris, Ion Androutsopoulos, Dimitris Plexousakis, “Deception Detection in Text and its Relation to the Cultural Dimansion of Individualism-Collectivism”. Natural Language Engineering, pp. 1-62, 2021.
  • Alexandros Vassiliades, Giorgos Flouris, Theodore Patkos, Antonis Bikakis, Nick Bassiliades and Dimitris Plexousakis, “A Multi Attack Argumentation Framework”, 4th International Conference on Logic and Argumentation (CLAR 2021), Hangzhou, China, 2021
    (Best paper award)
  • Alexandros Vassiliades, Theodore Patkos, Vasilis Efthymiou, Antonis Bikakis, Nick Bassiliades, Dimitris Plexousakis, “Object-Action Association Extraction from Knowledge Graphs”. SEMANTICS'21, pp. 241-253, 2021.
  • Ioannis Chrysakis, Giorgos Flouris, Maria Makridaki, Theodore Patkos, Yannis Roussakis, Samaritakis Giorgos, Nikoleta Tsampanaki, Elias Tzortzakakis, Elisjana Ymeralli, Tom Seymoens, Anastasia Dimou, and Ruben Verborgh, “A Rewarding Framework for Crowdsourcing to Increase Privacy Awareness” 35th Annual IFIP WG 11.3 Conference on Data and Applications Security and Privacy (DBSec 2021), Calgary, Canada, 19-20/7 2021
    (Received a Best Paper Award)
  • Alexandros Vassiliades, Nikos Zarkadas, Nick Bassiliades, and Theodore Patkos, “Onto-IKEA: A Knowledge Retrieval Framework based on IKEA Ontology”, 12th International Conference on Formal Ontology in Information Systems, Bolzano, Italy, 2021
  • Alexandros Vassiliades, Ilias Papadimitriou, Nick Bassiliades, Theodore Patkos, “Visual Gorgias: A Mechanism for the Visualization of an Argumentation Dialogue”, to appear at the 25th Pan-Hellenic Conference on Informatics, Volos, Greece, 2021

2020

  • Filippos Gouidis, Alexandros Vassiliades, Theodore Patkos, Antonis Argyros, Nick Bassiliades, Dimitris Plexousakis, “A Review on Intelligent Object Perception Methods Combining Knowledge-based Reasoning and Machine Learning”. AAAI-MAKE: Combining Machine Learning and Knowledge Engineering in Practice, AAAI Spring Symposium, March 23-25, Stanford University, Palo Alto, California, USA, 2020.
  • Alexandros Vassiliades, Nick Bassiliades, Filippos Gouidis, and Theodore Patkos, “A Knowledge Retrieval Framework for Household Objects and Actions with External Knowledge”. In: Blomqvist E. et al. (eds) Semantic Systems. In the Era of Knowledge Graphs. SEMANTICS 2020. Lecture Notes in Computer Science, pp 36-52, vol 12378, 2020.
  • Alexandros Vassiliades, Theodore Patkos, Antonis Bikakis, Giorgos Flouris, Nick Bassiliades and Dimitris Plexousakis, “Preliminary Notions of Arguments from Commonsense Knowledge”. In the 11th Hellenic Conference on Artificial Intelligence (SETN 2020), p. 211-214 Athens, Greece, 2020.
  • Ioannis Chrysakis, Giorgos Flouris, George Ioannidis, Maria Makridaki, Theodore Patkos, Yannis Roussakis, Georgios Samaritakis, Alexandru Stan, Nikoleta Tsabanaki, Elias Tzortzakakis and Elisjana Ymeralli, “Evaluating the data privacy of mobile applications through crowdsourcing”, 33rd International Conference on Legal Knowledge and Information Systems (JURIX 2020), December 9-11, 2020.
  • Alexandru Stan, Konstantina Geramani, George Ioannidis, Ioannis Chrysakis, Giorgos Flouris, Maria Makridaki, Theodore Patkos, Yannis Roussakis, Georgios Samaritakis, Nikoleta Tsampanaki, Elias Tzortzakakis, Elisjana Ymeralli, “CAP-A: A community-driven approach to privacy awareness”, In Proceedings of the NEM Summit 2020, B’ Smart – European Media Science and Technology Meets Arts, Application, Experimental and Business Track, 2020.
  • Ioannis Chrysakis, Giorgos Flouris, Theodore Patkos, Anastasia Dimou, Ruben Verborgh. “REWARD: Ontology for reward schemes”. In Poster Proceedings of the 17th Extended Semantic Web Conference (ESWC-20), p. 56-60, 2020.

2019

  • Nikoleta Tsampanaki, Theodore Patkos, Giorgos Flouris, Dimitris Plexousakis, “Revising event calculus theories to recover from unexpected observations”, Annals of Mathematics and Artificial Intelligence, https://doi.org/10.1007/s10472-019-09663-5, 2019.
  • Dimitris Arampatzis, Maria Doulgeraki, Michalis Giannoulis, Evropi Stefanidi, Theodore Patkos, “EduBAI: An Educational Platform for Logic-Based Reasoning”. In: MacIntyre J., Maglogiannis I., Iliadis L., Pimenidis E. (eds) Artificial Intelligence Applications and Innovations. AIAI 2019, IFIP AICT 559, pp. 464–472, 2019.

2018

  • Filippos Gouidis, Theodore Patkos, Giorgos Flouris Dimitris Plexousakis, “Dynamic Repairing A*: a Plan-Repairing Algorithm for Dynamic Domains”, in the Proceedings of the 10th International Conference on Agents and Artificial Intelligence, 2018.
  • Dimitra Zografistou, Giorgos Flouris, Theodore Patkos, Dimitris Plexousakis, “Implementing the ArgQL Query Language”, in Proceedings of the 7th International Conference on Computational Models of Argument (Comma-18), pp. 241-248, 2018
  • Vangelis Kritsotakis, Yannis Roussakis, Theodore Patkos, Maria Theodoridou, “Assistive Query Building for Semantic Data”, in Poster/Demo Proceedings of the 14th European conference on Semantic Technologies and AI (SEMANTiCS-18), 2018
    (Received a Best Demo and Poster Award) (blind review)
  • Prodormos Lilitsis, Theodore Patkos, Giorgos Flouris, Dimitris Plexousakis, “Travel Companion: A mobile system for trip assistance relying on Artificial Intelligence and Augmented Reality”, Poster Session in the 10th Hellenic Conference on Artificial Intelligence (SETN-18), Patras 9-12 July, 2018.
  • Giorgos Flouris, Theodore Patkos, Ioannis Chrysakis, Ioulia Konstantinou, Nikolay Nikolov, Panagiotis Papadakos, Jeremy Pitt, Dumitru Roman, Alexantru Stan, Chrysostomos Zeginis, “Towards a Collective Awareness Platform for Privacy Concerns and Expectations”, Confederated International Conferences: CoopIS, C&TC, and ODBASE 2018, Valletta, Malta, October 22-26, 2018

2017

  • Elisjana Ymeralli, Giorgos Flouris, Theodore Patkos, Dimitris Plexousakis. “APOPSIS: A Web-based Platform for the Analysis of Structured Dialogues”. In Proceedings of the 16th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE-17), 2017.
  • Nikoleta Tsabanaki, Giorgos, Flouris, Theodore Patkos, “Steps Towards Commonsense-Driven Belief Revision in the Event Calculus”, In Proceedings of the 13th International Symposium on Commonsense Reasoning (Commonsense-17), 2017.
  • Ioannis Chrysakis, Emmanouil Dermitzakis, Giorgos Flouris, Theodore Patkos, Dimitris Plexousakis. “PRESS: A Publication REpository Semantic System”. In Poster/Demo Proceedings of the 13th International Conference on Semantic Systems (SEMANTiCS-17), 2017.
  • Giorgos Flouris, Theodore Patkos, Ilia Adami, Antonis Bikakis, Manos Dimitrakis, George Mathioudakis, Giannis Roussakis, Dimitris Plexousakis. “Methinks: Enabling Sophisticated Comment Management in the Social Web”. In Poster/Demo Proceedings of the 13th International Conference on Semantic Systems (SEMANTiCS-17), 2017.
  • Keith G. Jeffery, Carlo Meghini, Cesare Concordia, Theodore Patkos, Valerie Brasse, Jacco von Ossenbruck, Yannis Marketakis, Nikos Minadakis, Eda Marchetti “A Reference Architecture for Virtual Research Environments”, in the Proceedings of the 15th International Symposium of Information Science (ISI 2017), pages 76-88, 2017.

2016

  • Theodore Patkos, Giorgos Flouris, Antonis Bikakis, “A Multi-Aspect Evaluation Framework for Comments on the Social Web”, in the 15th International Conference on Principles of Knowledge Representation and Reasoning (KR'16), pages 593-596, 2016.
  • Theodore Patkos, Dimitris Plexousakis, Abdelghani Chibani, Yacine Amirat, “An Event Calculus Production Rule System for Reasoning in Dynamic and Uncertain domains”, in Theory and Practice of Logic Programming (TPLP) Volume 16, Issue 3, pp. 325-352, 2016.
    [PDF]
  • Theodore Patkos, Giorgos Flouris, Antonis Bikakis, “Symmetric Multi-Aspect Evaluation of Comments - Extended Abstract”, European Conference on Artificial Intelligence (ECAI'16), pp. 1672-1673, 2016.
  • Yannis Tzitzikas, Carlo Allocca, Chryssoula Bekiari, Yannis Marketakis, Pavlos Fafalios, Martin Doerr, Nikos Minadakis, Theodore Patkos, Leonardo Candela “Unifying heterogeneous and distributed information about marine species through the top level ontology MarineTLO”, Emerald Group Publishing Limited, Program, Vol. 50, Iss 1, pp. 16 - 40, 2016.
    [PDF]

2015

  • Martin Homola, Theodore Patkos, Giorgos Flouris, Jozef Frtus, Alexander Simko, Jan Sefranek, Dimitra Zografistou, Martin Balaz, “Resolving Conflicts in Knowledge for Ambient Intelligence”, The Knowledge Engineering Review (KER), Vol. 30:5, Cambridge University Press, pp. 455-513, 2015.
    [PDF]
  • Martin Homola, Theodore Patkos “Different Types of Conflicting Knowledge in AmI Environments”, In the 19th International Conference on Knowledge Engineering and Knowledge Management (EKWA 2014) Satellite Events, pp 52-63, 2015.
    [PDF]
  • Dimitra Zografistou, Giorgos Flouris, Theodore Patkos, Dimitris Plexousakis, Martin Baláž, Martin Homola and Alexander Simko, A dialogical model for collaborative decision making based on compromises”, In the 12th European Conference on Multi-Agent Systems (EUMAS’14), pp 414-423, 2015.
  • Theodore Patkos, Giorgos Flouris, Panagiotis Papadakos, Antonis Bikakis, Pompeu Casanovas, Jorge González-Conejero, Rebeca Varela Figueroa, Anthony Hunter, Guðjón Idir, George Ioannidis, Marta Kacprzyk-Murawska, Andrzej Nowak, Jeremy Pitt, Dimitris Plexousakis, Agnieszka Rychwalska, Alexandru Stan, “Privacy-by-Norms, Privacy Expectations in Online Interactions”, 3rd IEEE International Workshop on Self-Adaptive and Self-Organising Systems (SASOW), pp 1-6, Cambridge, September 25, 2015.
    [PDF]

2014

  • Filippos Gouidis, Theodore Patkos, Giorgos Flouris, Dimitris Plexousakis, “Declarative Reasoning Approaches for Agent Coordination”, 8th Hellenic Conference on Artificial Intelligence (SETN-14), pp. 489-503, Ioannina, May 15-17, 2014.
  • Martin Homola, Theodore Patkos “Different Types of Conflicting Knowledge in AmI Environments”, In the 6th International Workshop on Acquisition, Representation and Reasoning about Context with Logic (ARCOE-Logic), 2014.
  • Fedor Lehocki, Martin Homola, Theodore Patkos, “Continuous Blood Pressure Monitoring in Telemedical Hypertension Application”, Workshop on Smart Healthcare and Healing Environments in conjunction with the European Conference on Ambient Intelligence (AmI’14), Eindhoven, The Netherlands, 2014.

2013

  • Jiefei Ma, Rob Miller, Leora Morgenstern, Theodore Patkos, An Epistemic Event Calculus for ASP-based Reasoning About Knowledge of the Past, Present and Future, in the 19th International Conference on Logic for Programming, Artificial Intelligence and Reasoning (LPAR-19), Stellenbosch, South Africa, 2013.
  • Rob Miller, Leora Morgenstern, Theodore Patkos. Reasoning About Knowledge and Action in an Epistemic Event Calculus. To appear in the 11th International Symposium on Logical Formalizations of Commonsense Reasoning (Commonsense'13), 2013.
  • Dimitris Plexousakis, Theodore Patkos. Calculi for Reasoning about Action and Knowledge. To appear in the 9th Panhellenic Logic Symposium (PLS9), 2013.
  • Yannis Tzitzikas, Carlo Allocca, Chryssoula Bekiari, Yannis Marketakis, Pavlos Fafalios, Martin Doerr, Nikos Minadakis, Theodore Patkos, and Leonardo Candela, Integrating Heterogeneous and Distributed Information about Marine Species through a Top Level Ontology, in the 7th Metadata and Semantics Research Conference (MTSR’13), pp. 289-301, 2013.

2012

  • Theodore Patkos, Abdelghani Chibani, Dimitris Plexousakis and Yacine AmiratA Production Rule-based Framework for Causal and Epistemic Reasoning , in the 6th International Symposium on Rules (RuleML'12), pp. 120-135, 2012.
    (Received a Best Paper Award)
  • Beibei Hu, Theodore Patkos, Abdelghani Chibani and Amirat Yacine. Rule-based Context Assessment in Smart Cities, in the 6th International Conference on Web Reasoning and Rule Systems (RR'12), pp. 221-224, 2012.

2011

  • Theodore Patkos, Dimitris Plexousakis, "Epistemic Reasoning for Ambient Intelligence”, in Proceedings of 3rd International Conference on Agents and Artificial Intelligence (ICAART’11), pp. 242-248, 2011.
    [ PDF ]
  • Theodore Patkos, Dimitris Plexousakis, "Efficient Epistemic Reasoning in Partially Observable Dynamic Domains Using Hidden Causal Dependencies", in the 9th International Workshop on Nonmonotonic Reasoning, Action and Change (NRAC 2011), pp. 55-62, Barcelona, Spain, 2011.

2010

  • Theodore Patkos, Ioannis Chrysakis, Antonis Bikakis, Dimitris Plexousakis, Grigoris Antoniou, "A Reasoning Framework for Ambient Intelligence", in Proceedings of 6th Hellenic Conference on Artificial Intelligence (SETN 10), S. Konstantopoulos et al. (Eds.), LNAI 6040, Springer-Verlag pp. 213–222, Athens Greece, May 4-7, 2010.
    [ bib | PDF ]
    (Nominated for Best Student Paper Award)

2009

  • Theodore Patkos, Dimitris Plexousakis. “Reasoning with Knowledge, Action and Time in Dynamic and Uncertain Domains”. Proceedings of the 21st International Joint Conference on Artificial Intelligence (IJCAI'09), Pasadena, California, USA, pp. 885-890, 2009
    [ bib | PDF ]
  • Theodore Patkos, Antonis Bikakis, Grigoris Antoniou, Maria Papadopouli, Dimitris Plexousakis. “Design and Challenges of a Semantics-based Framework for Context-Aware Services” . International Journal of Reasoning-based Intelligent Systems (IJRIS), Vol. 1 (1/2), pp. 18-30, 2009.
    [ bib | PDF ]
  • Theodore Patkos, Dimitris Plexousakis. "Sensing Inertial and Continuously-Changing World Features". 5th IFIP Conference on Artificial Intelligence Applications & Innovations (AIAI'09), Thessaloniki, Greece, pp. 379-388, 2009.
    [ bib | PDF ]
  • M. Kritsotakis, M. Michou, E. Nikoloudakis, A. Bikakis, T. Patkos, D. Plexousakis and G. Antoniou. “Design and Implementation of a Semantics-based Contextual Navigation Guide for Indoor Environments”. Journal of Ambient Intelligence and Smart Environments, Vol. 1 (3), pp. 261-285, 2009.
    [ bib | PDF ]
  • E. Nikoloudakis, M. Kritsotakis, A. Bikakis, T. Patkos, D. Plexousakis and G. Antoniou. “Exploiting Semantics for Indoor Navigation and User-Tracking”. International Symposium on UbiCom Frontiers – Innovative Research, Systems and Technologies (UFirst 2009), Australia, pp. 149-154, 2009.
    [ bib | PDF ]

2008

  • Theodore Patkos, Dimitris Plexousakis. "A Theory of Action, Knowledge and Time in the Event Calculus". 5th Hellenic Conference on Artificial Intelligence (SETN '08), Syros, Greece, pp. 226-238, 2008.
    [ bib | PDF ]
    (Received a Best Student Paper Award)
  • M. Kritsotakis, M. Michou, E. Nikoloudakis, A. Bikakis, T. Patkos, D. Plexousakis and G. Antoniou. "C-NGINE: A Contextual Navigation Guide for Indoor Environments". European Conference on Ambient Intelligence (AmI 08), Nurnberg, Germany, pp. 258-275, 2008.
    [bib | PDF]
  • Maria Michou, Antonis Bikakis, Theodore Patkos, Grigoris Antoniou and Dimitris Plexousakis. "A Semantics-based User Model for the Support of Personalized, Context-Aware Navigational Services". First International Workshop on Ontologies in Interactive Systems (ONTORACT'08), Liverpool, pp. 41-50, 2008.
    [bib | PDF]

2007

  • Theodore Patkos, Antonis Bikakis, Grigoris Antoniou, Maria Papadopouli and Dimitris Plexousakis. “Distributed AI for Ambient Intelligence: Issues and Challenges”. In: Proc. 2nd European Conference on Ambient Intelligence (AmI-07), Darmstadt, Germany, pp. 159-176, 2007.
    [ bib | PDF ]
  • Theodore Patkos, Antonis Bikakis, Grigoris Antoniou, Maria Papadopouli and Dimitris Plexousakis. “A Semantics-based Framework for Context - Aware Services : Lessons Learned and Challenges”. In: Proc. 4th International Conference on Ubiquitous Intelligence and Computing (UIC -07), Hong Kong, China, pp. 839-848, 2007.
    [ bib | PDF]
  • Antonis Bikakis, Theodore Patkos, Grigoris Antoniou, and Dimitris Plexousakis. "A Survey of Semantics-based Approaches for Context Reasoning in Ambient Intelligence" In: Proc Workshop on Artificial Intelligence Methods for Ambient Intelligence, Germany, 2007.

2006

  • Theodore Patkos, Antonis Bikakis, Grigoris Antoniou, Maria Papadopouli, Dimitris Plexousakis. "A Semantic-based Framework for Context-Aware Pedestrian Guiding Services". In: Second International Workshop on Semantic Web Technology for Ubiquitous and Mobile Applications (SWUMA'06), Riva del Garda, Trentino, Italy, August 28, 2006.

2005

  • Theodoros Patkos, Dimitris Plexousakis. “A Semantic Marketplace of Peers Hosting Negotiating Intelligent Agents”. In: Proceedings of the CAiSE'05 Forum, Porto, Portugal, pp. 3-8, 2005.
  • Theodoros Patkos, Dimitris Plexousakis. “A Semantic Marketplace of Negotiating Agents”. In: Proceedings of the 4th International Workshop on Agents and Peer-to-Peer Computing (AP2PC'05), pp. 101-113, Utrecht, Netherlands, 2005.

Magazines

  • Dimitra Zografistou, Giorgos Flouris, Theodore Patkos, Dimitris Plexousakis, “A Language for Graphs of Interlinked Arguments”. ERCIM News magazine Vol. 118, p. 48, 2019.
  • Nikoleta Tsabanaki, Theodore Patkos, Dimitris Plexousakis, “Having Trouble Deciding Which Wine to Order? Try Le Sommelier Recommendation System”, ERCIM News magazine, Vol. 113, p. 56, Special Theme: Smart Farming, April 2018.
  • Elisjana Ymeralli, Theodore Patkos and Yannis Roussakis, “APOPSIS: A Web-based Platform for the Analysis of Structured dialogues”, ERCIM News magazine, Vol. 112 pp. 41-42, Special Theme: Quantum Computing, January 2018
  • Filippos Gouidis, Theodore Patkos, Giorgos Flouris, “Smart City Operation Center: A Platform to Optimize Urban Service Rendering”, ERCIM News magazine, Vol. 98 pp. 49-50, Special Theme: Smart Cities, July 2014.
  • Theodore Patkos, Dimitris Plexousakis, "DECKT: Epistemic Reasoning for Ambient Intelligence", ERCIM News magazine - Special Theme: Intelligent and Cognitive Systems, Issue 84, January 2011.
    [ PDF ]

Technical Reports

  • Filippos Gouidis, Theodore Patkos, Giorgos Flouris, Dimitris Plexousakis, The DRA* Algorithm, FORTH TR-468, 2017.
  • Theodore Patkos, Giorgos Flouris, Antonis Bikakis Rating Comments on the Social Web using a Multi-Aspect Evaluation Framework, FORTH TR-463, 2016.
  • Giorgos Flouris, Antonis Bikakis, Theodore Patkos, Globally Interconnecting Persuasive Arguments: The Vision of the Persuasive Web, FORTH TR-438, 2013.
  • Martin Baláž, Giorgos Flouris, Jozef Frtús, Martin Homola, Theodore Patkos, Ján Šefránek, Alexander Šimko, Dimitra Zografistou, KR Methods to Deal with Conflicts in AmI Systems, Univerzita Komenského v Bratislave TR-041, 2013.

Theses

  • Theodore Patkos, "A Formal Theory for Reasoning About Action, Knowledge and Time", Doctor of Philosophy Thesis, Dept. of Computer Science, University of Crete, September 2010.
    [ PDF | Abstract (english & greek) ]
  • Theodoros Patkos, " A Semantic Marketplace of Peers Hosting Negotiating Intelligent Agents", Master of Science Thesis, Dept. of Computer Science, University of Crete, November 2004.
    [ PDF ]
  • Theodore Patkos, “Resource Management Policies and Performance Issues for e-Commerce Servers”, Bachelor Thesis, Department of Informatics, Aristotle University of Thessaloniki, June 2002.