Knowledge Representation and Reasoning

The Semantic Web technologies provide the means and tools to unanimously represent the meaning of Web entities and their relations to one another, in a machine-interpretable manner. While modelling and managing knowledge for web entities has long ago been established, the Semantic Web technologies also show great potential in other domains, in both online and offline worlds.

Two such prominent applications have to do with representing and managing context, enabling two different flavours of context-aware computing. Context-awareness in pervasive computing translates to situation awareness and enables intelligent reasoning and decision making in smart spaces, in real- or close to real-time. Meanwhile, context-of-use alters the very meaning of persistent entities, such as those met in digital preservation and cultural heritage, which stimulates further research questions in topics such as ontology evolution and concept drift.

In our group, Semantic Web technologies are employed to deliver solutions for a multitude of challenges, relevant not only to the heterogeneity of communication protocols and interfaces, but also to the diverse context-aware information exchange, representation and processing capabilities. Our solutions address a variety of such challenges and application domains using semantic knowledge representation, management and reasoning:

  • Semantic interoperability
  • Context-aware modelling
  • Hybrid reasoning schemes and intelligent decision making
  • Real-time analytics, fusion of data sources leveraging Big Data, sensor integration and reference platform
  • Activity Recognition under uncertainty, noise and incomplete data
  • Semantic Complex Event Processing
  • Applications in eHealth, AAL and clinical applications

PROJECTS

PUBLICATIONS

  1. M. Papoutsoglou, G. Meditskos, N. Bassiliades, E., and S. Vrochidis. 2024. Mapping the Current Status of CTI Knowledge Graphs through a Bibliometric Analysis. In 13th Conference on Artificial Intelligence (SETN 2024), September 11–13, 2024, Piraeus, Greece. ACM, New York, NY, USA, 6 pages OPEN ACCESS
  2. A. Kougioumtzidou, A. Papoutsis, D. Kavallieros, T. Mavropoulos, T. Tsikrika, S. Vrochidis, and I. Kompatsiaris, "An End-to-End Framework for Cybersecurity Taxonomy and Ontology Generation and Updating," in 2024 IEEE International Conference on Cyber Security and Resilience, CSR 2024, London, UK, September 2-4, 2024, IEEE
  3. E. Tziviloglou, C. Stentoumis, J. I. Alvarez, E. Stathopoulos, S. Diplaris, A. Sfetsos, D. Vlachogiannis and I. Karatasios, "Resilient and adaptive renovation of 20th century buildings towards net-zero carbon built heritage - The approach of the SINCERE research project". Proceedings of the 11th International Symposium on the Conservation of Monuments in the Mediterranean Basin (MONUBASIN), Athens, Greece, June 17-19, 2024. OPEN ACCESS
  4. E.A. Stathopoulos, A. Vassiliades, S. Diplaris, S. Vrochidis, I. Kompatsiaris, "Applied logic and semantics on indoor and urban adaptive design through knowledge graphs, reasoning and explainable argumentation", The Knowledge Engineering Review. 2024;39:e4. doi:10.1017/S0269888924000043 OPEN ACCESS
  5. Masa, P.; Kintzios, S.; Vasileiou, Z.; Meditskos, G.; Vrochidis, S.; Kompatsiaris, I. A Semantic Framework for Decision Making in Forest Fire Emergencies. Appl. Sci. 2023, 13, 9065. https://doi.org/10.3390/app13169065 OPEN ACCESS
  6. E. A. Stathopoulos, A. Vassiliades, S. Diplaris, S. Vrochidis, N. Bassiliades, and I. Kompatsiaris, "The MindSpaces Knowledge Graph: Applied Logic and Semantics on Indoor and Urban Adaptive Design". In ICAART 2023), 22-24 Feb 2023, Lisbon, Portugal, Vol. 3, pp. 334-341. OPEN ACCESS
  7. Z.Vasileiou, G.Meditskos, S.Vrochidis, N.Bassiliades, "An Explainable Intervention Prediction for Trauma Patients", Semantic Web Applications and Tools for Health Care and Life Sciences (SWAT4HCLS), 13-16 February 2023, Basel Switzerland (Poster).
  8. Vassiliades, A., Symeonidis, S., Diplaris, S., Tzanetis, G., Vrochidis, S., Bassiliades, N. & Kompatsiaris, I., (2022). "XR4DRAMA Knowledge Graph: A Knowledge Graph for Disaster Management". In Proceedings of: 17th Internation Conference on Semantic Computing (ICSC), 1-3 February 2023, The Hills Hotel, Laguna Beach, California,USA. OPEN ACCESS
  9. A. Kokkalas, A.T. Patenidis, E.A. Stathopoulos, E.E. Mitsopoulou, S. Diplaris, K. Papadopoulos, S. Vrochidis, K. Votis, D. Tzovaras, and I. Kompatsiaris, "e-Tracer: a Smart, Personalized and Immersive Digital Tourist Software System” in Proceedings of The 24th International Conference on Information Integration and Web Intelligence (iiWAS2022), 28-30 November 2022, Online.
  10. E.A. Stathopoulos, A.I. Karageorgiadis, A. Kokkalas, S. Diplaris, S. Vrochidis, and I. Kompatsiaris, "Social Media and Web Sensing with Semantic Integration on the Refugee Crisis", in IEEE 17th International Workshop on Semantic and Social Media Adaptation & Personalization (SMAP), 3-4 November 2022, Online. DOI: 10.1109/SMAP56125.2022.9942201. © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
  11. S. Symeonidis, G. Meditskos, S. Vrochidis, K. Avgerinakis, J. Derdaele, M. Vergauwen, M. Bassier, A. Moghnieh, L. Fraguada, V. Vogler, Y. Shekhawat, L. Wanner, M. Marimon, K. Valsamidou, P. Koulali, A. Tellios, J. Wuyts, E. Lopez, "V4Design: Intelligent analysis and integration of multimedia content for Creative Industries", in IEEE Systems Journal, 2022, DOI:10.1109/JSYST.2022.3217655
  12. Ntioudis D, Masa P, Karakostas A, Meditskos G, Vrochidis S, Kompatsiaris I. Ontology-Based Personalized Job Recommendation Framework for Migrants and Refugees. Big Data and Cognitive Computing. 2022; 6(4):120. DOI:10.3390/bdcc6040120
  13. P. Masa, G.Tzanetis, S. Kintzios, G. Meditskos, S. Vrochidis, I. Vourvachis, L. Nerantzis, I. Kompatsiaris, " Ontology-based technologies for disaster preparedness, response and recovery", in the Proceedings of the 9th International Conference on Civil Protection & New Technologies (SafeThessaloniki 2022), 29 September - 1 October 2022, Thessaloniki, Greece. OPEN ACCESS
  14. P. Masa, G. Meditskos, S. Kintzios, S. Vrochidis, I. Kompatsiaris, "Ontology-based Modelling and Reasoning for Forest Fire Emergencies in Resilient Societies", 12th EETN Conference on Artificial Intelligence (SETN 2022), September 7-9 2022, Corfu, Greece.
  15. Z. Vasileiou, G. Meditskos, S. Vrochidis, N. Bassiliades, "An Explainable Multimodal Fusion Approach for Mass Casualty Incidents". In Proceedings of the 4th International Workshop on Machine Learning and Knowledge Graphs At 33rd  International Conference on Database and Expert Systems Applications, DEXA 2022, August 22-24, 2022, Vienna, Austria. OPEN ACCESS
  16. Jesús Gorroñogoitia, Dragan Radolović, Zoe Vasileiou, Georgios Meditskos, Anastasios Karakostas, Stefanos Vrochidis & Michail Bachras (2022), "The SODALITE Model-Driven Approach" In Elisabetta Di Nitto, Jesús Gorroñogoitia Cruz, Indika Kumara, Dragan Radolović, Kamil Tokmakov, Zoe Vasileiou (eds), Deployment and Operation of Complex Software in Heterogeneous Execution Environments , Springer, DOI:https://doi.org/10.1007/978-3-031-04961-3, 23-52, July 2022.
  17. Indika Kumara, Alfio Lazzaro, Nina Mujkanovic, Zoe Vasileiou & Damian A. Tamburri, "Quality Assurance and Design-Time Optimization" In Elisabetta Di Nitto, Jesús Gorroñogoitia Cruz, Indika Kumara, Dragan Radolović, Kamil Tokmakov, Zoe Vasileiou (eds), Deployment and Operation of Complex Software in Heterogeneous Execution Environments , Springer, DOI:https://doi.org/10.1007/978-3-031-04961-3, 53-66, July 2022.
  18. S. Andreadis, M. Elias, T. Mavropoulos, C. Papadopoulos, N. Pantelidis, I. Gialampoukidis, S. Vrochidis, and I. Kompatsiaris, "SPARQL querying for validating the usage of automatically georeferenced social media data as human sensors for air quality". In Proceedings of the 2022 IEEE 14th Image, Video, and Multidimensional Signal Processing Workshop (IVMSP 2022), 26-29 June 2022, Nafplio, Greece. DOI: 10.1109/IVMSP54334.2022.9816191
  19. A. Vassiliades, S. Symeonidis, S. Diplaris, G. Tzanetis, S. Vrochidis and I. Kompatsiaris, “XR4DRAMA Knowledge Graph: A Knowledge Graph for Media Planning”, in Proceedings of: 15th Internation Conference on Agents and Artificial Intelligence (ICAART), 22-24 February 2023, Lisbon, Portugal. OPEN ACCESS
  20. Ι. Paliokas, E. E. Mitsopoulou, A. T. Patenidis, E. A., Stathopoulos, Α. Kokkalas, S., Diplaris, E. Karyati, S. Tsafaras, E. Tasiopoulou, C. Riggas, G. Meditskos, S. Vrochidis, K. Votis, I. Kompatsiaris, & D. Tzovaras (2021). Implementation of an Interactive Crowd-Enhanced Content Management System for Tourism Development. KnE Social Sciences, vol. 5, no. 9, pp. 275–282, 2021.
  21. C. Maga-Nteve, E. Kontopoulos, N. Tsolakis, P. Mitzias, I. Katakis, E. Mathioudis, K. Avgerinakis, G. Meditskos, A. Karakostas, S. Vrochidis and I. Kompatsiaris. (2021). A Semantic Technologies Toolkit for Bridging Early Diagnosis and Treatment in Brain Diseases – Report from the Ongoing EU-funded Research Project ALAMEDA. In Proceedings of Metadata and Semantics Research Conference, Springer, Madrid, 2021.
  22. G. Antzoulatos, T. Mavropoulos, G. Tzionis, A. Karakostas, A. Gonzalez Costas, M. González Burgos, S. Vrochidis, I. Kompatsiaris, "Usage of Visual Analytics to Support Immigration-Related, Personalised Language Training Scenarios", International Conference on Interactive Mobile Communication, Technologies and Learning (IMCL2021), 4–5 November 2021. OPEN ACCESS
  23. Α.-Μ., Koufakis, S., Tzanakis, A., Moumtzidou, G., Meditskos, A., Karakostas, S., Vrochidis, I., Kompatsiaris, "OntoAqua: Ontology-based Modelling of Context in Water Safety and Security", In proceedings of the 13th International Conference on Knowledge Engineering and Ontology Development-KEOD 2021, Valletta, Malta, 25-27 October 2021.
  24. C. Maga-Nteve, N. Tsolakis, G. Meditskos, A. Karakostas, S. Vrochidis and I. Kompatsiaris. (2021). "Ontology-based semantic model for health data interpretation", in Proceedings of Fourth International Workshop on Semantic Web Meets Health Data Management (SWH), the 20th International Semantic Web Conference (ISWC), Springer, Virtual Conference 24 - 28 October 2021.
  25. G. Antzoulatos, G. Orfanidis, P. Giannakeris, G. Tzanetis, G. Kampilis-Stathopoulos, N. Kopalidis, I. Gialampoukidis, S. Vrochidis, and I. Kompatsiaris (2021). "Severity level assessment from semantically fused video content analysis for physical threat detection in ground segments of space systems", in 2nd International Workshop on Cyber-Physical Security for Critical Infrastructures Protection (CPS4CIP 2021), 4-8 October 2021. OPEN ACCESS
  26. P. Masa , G. Meditskos, A. Karakostas , S. Vrochidis, I. Kompatsiaris, "On the Use of Semantic Web Technologies for Forest Fire Emergencies in Resilient Societies", In Proceedings of the 2021 International Conference on Security and Management (SAM'21), Las Vegas, USA, July 26-29, 2021. OPEN ACCESS
  27. I. Gialampoukidis, S. Andreadis, S. Vrochidis, and I. Kompatsiaris, "Multimodal data fusion of social media and satellite images for emergency response and decision-making", 2021 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2021), 11 July 2021, Online, pp. 228-231, IEEE. OPEN ACCESS
  28. S. Symeonidis, S. Diplaris, N. Heise, T. Pistola, A. Tsanousa, G. Tzanetis, E. Batziou, C. Stentoumis, I. Kalisperakis, S. Freitag, Y. Shekhawat, R. Paradiso, M. Pacelli, J. Codinak, S. Millek, M. Marimonk, M. Ferri, D. Norbiato, M. Monego, A. Karakostas and S. Vrochidis, "xR4DRAMA: Enhancing situation awareness using immersive (XR) technologies". In 2021 IEEE International Conference on Intelligent Reality (ICIR), Piscataway, NJ, USA, 2021, pp. 1-8. https://doi.org/10.1109/ICIR51845.2021.00010
  29. T. Pistola, S. Diplaris, C. Stentoumis, E. A. Stathopoulos, G. Loupas, T. Mandilaras, G. Kalantzis, I. Kalisperakis, A. Tellios, D. Zavraka, P. Koulali, V. Kriezi, V. Vraka, F. Venieri, S. Bacalis, S. Vrochidis, I. Kompatsiaris, "Creating immersive experiences based on intangible cultural heritage", In Proceedings of the 1st IEEE International Conference on Intelligent Reality (ICIR 2021), Virtual, 12-13 May, 2021.
  30. M. Rousi, G. Meditskos, S. Vrochidis, I. Kompatsiaris,“Supporting the Discovery and Reuse of Digital Content in Creative Industries using Linked Data”, 15th IEEE International Conference on Semantic Computing, (ICSC 2021), 27-29 January, 2021. http://dx.doi.org/10.1109/ICSC50631.2021.00025
  31. A. Chatzimichail, E. A. Stathopoulos, D. Ntioudis, A. Tsanousa, M. Rousi, A. Mavropoulos, G. Meditskos, S. Vrochidis and I. Kompatsiaris. “IoT and Semantic Web Technologies”. Semantic IOT: Theory and Applications - Interoperability, Provenance and Beyond, Book series: Studies in Computational Intelligence, Springer, 2020, p. 3-33. OPEN ACCESS
  32. S. Mille, S. Symeonidis, M. Rousi, M. Marimon Felipe, K. Stavrothanasopoulos, P. Alvanitopoulos, R. Carlini Salguero, J. Grivolla, G. Meditskos, S. Vrochidis and L. Wanner, "A Case Study of NLG from Multimedia Data Sources: Generating Architectural Landmark Descriptions", in WebNLG+: 3rd Workshop on Natural Language Generation from the Semantic Web, (INLG 2020), 15-18 December 2020. OPEN ACCESS
  33. G. Meditskos, Z. Vasileiou, A. Karakostas, S. Vrochidis, I. Kompatsiaris, “A Pattern-based Semantic Lifting of Cloud and HPC Applications using OWL 2 Meta-modelling”, International Conference on High Performance Computing & Simulation (HPCS 2020), Barcelona Spain, 10-14 December 2020.
  34. M. Rousi, V. Sitokonstantinou, G. Meditskos, I. Papoutsis, I. Gialampoukidis, A. Koukos, V. Karathanassi, T. Drivas, S. Vrochidis, C. Kontoes, I. Kompatsiaris. “Semantically enriched crop type classification and Linked Earth Observation Data to support the Common Agricultural Policy monitoring”. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. vol. 14, pp. 529-552, 17 November 2020. OPEN ACCESS
  35. D. Ntioudis, E. Kamateri, G. Meditskos, A. Karakostas, F. Huber, R. Bratska, S. Vrochidis, B. Akhgar, I. Kompatsiaris, “IMMERSE: A Personalized System Addressing the Challenges of Migrant Integration”, in IEEE International Conference on Multimedia and Expo (ICME2020), Workshop on ICT and Multimedia Tools for Migrants Inclusion in Host societies (WIMMIH2020), 2020.
  36. I. Kumara, Z. Vasileiou, G. Meditskos, D. Tamburri, W.J. Van Den Heuvel, A. Karakostas, S. Vrochidis and I. Kompatsiaris, "Towards Semantic Detection of Smells in Cloud Infrastructure Code", 10th International Conference on Web Intelligence, Mining and Semantics (WIMS2020). OPEN ACCESS
  37. A. Koufakis, D. Chatzakou, G. Meditskos, T. Tsikrika, S. Vrochidis, I. Kompatsiaris, "Semantic Web Technologies in Fighting Crime and Terrorism: The CONNEXIONs Approach", Invited talk in 1st International Workshop on IoT infrastructures for safety in pervasive environments (IoT4SAFE), 2 June, 2020. OPEN ACCESS
  38. D. Ntioudis, A. Chatzimichail, G. Meditskos, S. Vrochidis, I. Kompatsiaris, "Ontology-based Reasoning for Critical Incidents in Public Events", in 1st International Workshop on IoT infrastructures for safety in pervasive environments (IoT4SAFE), 2 June, 2020.
  39. E.A. Stathopoulos, A. Kokkalas, E.E. Mitsopoulou, A.T. Patenidis, G. Meditskos, S. Diplaris, I. Paliokas, S. Vrochidis, K. Votis, D. Tzovaras, and I. Kompatsiaris, "Knowledge-based Management and Reasoning on Cultural and Natural Touristic Detours", in Artificial Intelligence Applications and Innovations. AIAI 2020. IFIP Advances in Information and Communication Technology, Maglogiannis I., Iliadis L., Pimenidis E. (eds), vol 583. Springer, Cham, 2020.
  40. M. Riga, E. Kontopoulos, K. Ioannidis, S. Kintzios, S. Vrochidis, I. Kompatsiaris (2020). “EUCISE-OWL: An Ontology-based Representation of the Common Information Sharing Environment (CISE) for the Maritime Domain” Semantic Web, vol. 12, no. 4, pp. 603-615, 2021. OPEN ACCESS
  41. G. Meditskos, S. Vrochidis, I. Kompatsiaris, "V4Ann: Representation and Interlinking of Atom-based Annotations", In: Acosta M., Cudre-Mauroux P., Maleshkova M., Pellegrini T., Sack H., Sure-Vetter Y. (eds) Semantic Systems. The Power of AI and Knowledge Graphs. SEMANTiCS 2019. Lecture Notes in Computer Science, vol 11702, pp 124-139, 2019. Springer, Cham. https://doi.org/10.1007/978-3-030-33220-4_10
  42. T. Mavropoulos, G. Meditskos, E. Kamateri, M. Rousi, S. Symeonidis, D. Tzimikas, L. Papageorgiou, C. Eleftheriadis, G. Adamopoulos, S. Vrochidis, I. Kompatsiaris. “A context-aware conversational agent in the rehabilitation domain”. Special Issue “Intelligent Innovations in Multimedia Data”, Future Internet 1 November 2019, 11(11), 231.
  43. A. Chatzimichail, C. Chatzigeorgiou, A. Tsanousa, D. Ntioudis, G. Meditskos, F. Andritsopoulos, C. Karaberi, P. Kasnesis, D. Kogias, G. Gorgogetas, S. Vrochidis, C. Patrikakis, I. Kompatsiaris. “Internet of Things Infrastructure for Security and Safety in Public Places”. Special Issue, IoT Applications and Industry 4.0, Information, 10(11), 333, 28 October 2019. OPEN ACCESS
  44. E. A. Stathopoulos, I. Paliokas, G. Meditskos, S. Diplaris, G. Pehlivanides, S. Tsafaras, E. Valkouma, C. Riggas, S. Vrochidis, K. Votis, D. Tzovaras, and I. Kompatsiaris, "Smart Discovery of Cultural and Natural Tourist Routes", Workshop On Social Innovation And Web Intelligence Workshop On Social Innovation And Web Intelligence, International Conference on Web Intelligence, Thessaloniki, October 14–17, 2019. OPEN ACCESS
  45. P. Alvanitopoulos, S. Diplaris, B. de Gelder, A. Shvets, M. Benayoun, P, Koulali, A. Moghnieh, Y. Shekhawat, C. Stentoumis, T. Hosmer, R. Anadol, M. Borreguero, A. Martin, P. Sciama, K. Avgerinakis, P. Petrantonakis, A. Briassouli, S. Mille, A. Tellios, L. Fraguada, H. Sprengel, I. Kalisperakis, N. Cabanas, S. Nikolopoulos, S. Skouras, V. Vogler, D. Zavraka, J. Piesk, L. Grammatikopoulos, L. Wanner, T. Klein, S. Vrochidis, I. Kompatsiaris, "MindSpaces: Art-driven adaptive outdoors and indoors design", in Ninth International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage — DiPP2019, Burgas, Bulgaria, 26–28 September, 2019, pp 391-400. OPEN ACCESS
  46. G. Orfanidis, S. Apostolidis, A. Kapoutsis, K. Ioannidis, E. Kosmatopoulos, S. Vrochidis, & I. Kompatsiaris , "Autonomous swarm of heterogeneous robots for surveillance operations", in Workshop on Vision-enabled UAV and counter-UAV technologies for surveillance and security of critical infrastructures (UAV4S), Thessaloniki, Greece, 2019. OPEN ACCESS
  47. E. Kamateri, G. Meditskos, S. Symeonidis, S. Vrochidis, I. Kompatsiaris, W. Minker, "Knowledge-based Intelligence and Strategy Learning for Personalised Virtual Assistance in the Healthcare Domain", Semantic Technologies for Healthcare and Accessibility Applications (SyMpATHY), special session in the 13th International Conference on Advances in Semantic Processing (SEMAPRO), 2019.
  48. P. Hertweck, J. Mossgraber, E. Kontopoulos, P. Mitzias, T. Hellmund, A. Karakostas, D. Hilbring, H. van der Schaaf, S. Vrochidis, J.-W. Blume and I. Kompatsiaris. “The Backbone of Decision Support Systems: The Sensor to Decision Chain”. IJISCRAM 10.4: 65-87. Web. 29 August 2019. OPEN ACCESS
  49. T. Mavropoulos, G. Meditskos, E. Kamateri, S. Symeonidis, D. Tzimikas, L. Papageorgiou, C. Eleftheriadis, G. Adamopoulos, S. Vrochidis, I. Kompatsiaris, "A Smart Dialogue-competent Monitoring Framework Supporting People in Rehabilitation", in Multimodal Signal Sensing and Analysis for Assistive Environments for Improving Quality-Of-Life (AGENT Workshop), 12th Pervasive Technologies Related to Assistive Environments Conference (PETRA’19). ACM, Rhodes, Greece, June 5-7, 2019. OPEN ACCESS
  50. A. Chatzimichail, C. Chatzigeorgiou, F. Andritsopoulos, C. Karaberi, G. Meditskos, P. Kasnesis, D. Kogias, G. Gorgogetas, A. Tsanousa, S. Vrochidis, C. Patrikakis and I. Kompatsiaris, "Smart Interconnected Infrastructure for Security and Safety in Public Places", International Workshop on IoT Applications and Industry 4.0, co-located with the International Conference on Distributed Computing in Sensor Systems, Santorini Island, Greece May 29-31, 2019. DOI: 10.1109/DCOSS.2019.00069
  51. T. Mavropoulos, G. Meditskos, E. Kamateri, S. Vrochidis and I. Kompatsiaris, "REA: A Healthcare-Oriented Virtual Agent with Dialogue Capabilities", 8th Panhellenic Conference on Biomedical Technology, Hellenic Society for Biomedical Technology (ELEVIT), 9-10 May, Athens, Greece, 2019. OPEN ACCESS
  52. G. Meditskos, E. Kontopoulos, S. Vrochidis, I. Kompatsiaris. “Converness: Ontology-driven Conversational Awareness and Context Understanding in Multimodal Dialogue Systems”. Expert Systems, Special Issue on e-Health and Staying Smarter, 1 February 2019. OPEN ACCESS
  53. S. Vrochidis, A. Moumtzidou, I. Gialampoukidis, D. Liparas, G. Casamayor, L. Wanner, N. Heise, T. Wagner, A. Bilous, E. Jamin, B. Simeonov, V. Alexiev, R. Busch, I. Arapakis, I. Kompatsiaris. “A multimodal analytics platform for journalists analysing large-scale, heterogeneous multilingual and multimedia content”. Frontiers in Robotics and AI, 5, 123, 29 October 2018. OPEN ACCESS
  54. T. Stavropoulos, G. Meditskos, S. Vrochidis and I. Kompatsiaris, "Activity Recognition and Personalized Feedback Solution for Active and Healthy Ageing", in Intelligent Conversation Agents in Home and Geriatric Care Applications, Held in conjunction with the Federated AI Meeting (FAIM), 15th of July, Stockholm, Sweden, 2018.
  55. E. Kontopoulos, P. Mitzias, J. Mossgraber, P. Hertweck, H. van der Schaaf, X. Hilbring, F. Lombardo, D. Norbiato, M. Ferri, A. Karakostas, S. Vrochidis, I. Kompatsiaris,"Ontology-based Representation of Crisis Management Procedures for Climate Events", in 1st International Workshop on Intelligent Crisis Management Technologies for Climate Events (ICMT 2018), collocated with the 15th International Conference on Information Systems for Crisis Response and Management (ISCRAM 2018). OPEN ACCESS
  56. M. Riga, E. Kontopoulos, K. Karatzas, S. Vrochidis and I. Kompatsiaris, "An Ontology-based Decision Support Framework for Personalized Quality of Life Recommendations", in 4th International Conference on Decision Support System Technology (ICDSST2018), 22-25 May 2018, Heraklion, Crete, Greece. OPEN ACCESS
  57. J. Mossgraber, D. Hilbring, H. van der Schaaf, P. Hertweck, E. Kontopoulos, P. Mitzias, I. Kompatsiaris, S. Vrochidis, A. Karakostas, "The Sensor to Decision Chain in Crisis Management", In Int. Conf. on Information Systems for Crisis Response and Management (ISCRAM'18). OPEN ACCESS
  58. L. Wanner, E. Andre, J. Blat, S. Dasiopoulou, M. Farrus, T. Fraga, E. Kamateri, F. Lingenfelser, G. Llorach, O. Martinez, G. Meditskos, S. Mille, W. Minker, L. Pragst, D. Schiller, A. Stam, L. Stellingwerff, F. Sukno, B. Vieru, S. Vrochidis, "Design of knowledge-based agent as a social companion", in Proceedings of the International Conference on Health and Social Care Information Systems and Technologies (HCist), Barcelona, Catalonia, November 2017.
  59. G. Meditskos, S. Vrochidis, I. Kompatsiaris,"Description Logics and Rules for Multimodal Situational Awareness in Healthcare", in Special session on Multimedia and Multimodal Interaction for Health and Basic Care Applications at MMM 2017.
  60. G. Meditskos, E. Kontopoulos, S. Vrochidis, & I. Kompatsiaris, "Ontology-Driven Context Interpretation and Conflict Resolution in Dialogue-Based Home Care Assistance", In 9th Int. Conf. on Semantic Web Applications and Tools for Life Sciences - SWAT4LS. CEUR Workshop Proceedings, Paschke, A., Burger, A., Splendiani, A., Marshall, M.S., and Romano, P. (eds.), vol. 1795, Amsterdam, The Netherlands, 2016.
  61. B. Simeonov, V. Alexiev, D. Liparas, M. Puigbo, S. Vrochidis, E. Jamin and I. Kompatsiaris, "Semantic integration of web data for international investment decision support",  3rd international conference on Internet Science, Florence, Italy, Sept. 12-14 2016. OPEN ACCESS
  62. G. Meditskos, S. Dasiopoulou, S. Vrochidis, L. Wanner, I. Kompatsiaris,"Question Answering over Pattern-Based User Models", Proceedings of the 12th International Conference on Semantic Systems (SEMANTiCS 2016), pp. 153-160. ACM, New York, NY, USA, 2016. http://dx.doi.org/10.1145/2993318.2993331
  63. L. Wanner, J. Blat, S. Dasiopoulou, M. Dominguez, G. Llorach, S. Mille, F. Sukno, E. Kamateri, S. Vrochidis, I. Kompatsiaris, E. Andre, F. Lingenfelser, G. Mehlmann, A. Stam, L. Stellingwerff, B. Vieru, L. Lamel, W. Minker, L. Pragst, Stefan Ultes,"Towards a Multimedia Knowledge-Based Agent with Social Competence and Human Interaction Capabilities", 1st International Workshop on Multimedia Analysis and Retrieval for Multimodal Interaction (MARMI 2016), New York, USA, June 6, 2016. https://doi.org/10.1145/2927006.2927011
  64. G. Meditskos, S. Dasiopoulou, Louisa Pragst, S. Ultes, S. Vrochidis, I. Kompatsiaris, L. Wanner, "Towards an Ontology-driven Adaptive Dialogue Framework", 1st International Workshop on Multimedia Analysis and Re-trieval for Multimodal Interaction (MARMI 2016), New York, USA, June 6, 2016. https://doi.org/10.1145/2927006.2927009
  65. C. Doulaverakis, S. Vrochidis, I. Kompatsiaris,"Exploiting visual similarities for ontology alignment", 7th In-ternational Conference on Knowledge Engineering and Ontology Development (KEOD 2015), Lisbon, Portugal, 12-14 November, 2015. DOI: 10.5220/0005588200290037
  66. L. Wanner, M. Rospocher, S. Vrochidis, L. Johansson, N. Bouayad-Aghae, G. Casamayor, A. Karppinen, I. Kompatsiaris, S. Millee, A. Moumtzidou, L. Serafini. "Ontology-centered environmental information delivery for personalized decision support". Expert Systems With Applications, Volume 42, Issue 12, 15 July 2015, Pages 5032–5046. OPEN ACCESS
  67. T. Tsikrika, K. Andreadou, A. Moumtzidou, E. Schinas, S. Papadopoulos, S. Vrochidis, Y. Kompatsiaris, "A Unified Model for Socially Interconnected Multimedia-Enriched Objects", in 21st MultiMedia Modelling Conference (MMM2015), Sydney, Australia, 5-7 January, 2015. https://doi.org/10.1007/978-3-319-14445-0_32
  68. L. Wanner, H. Bosch, N. Bouayad-Agha, G. Casamayor, T. Ertl, D. Hilbring, L. Johansson, K. Karatzas, A. Karppinen, I. Kompatsiaris, T. Koskentalo, S. Mille, J. Mossgraber, A. Moumtzidou, M. Myllynen, E. Pianta, M. Rospocher, L. Serafini, V. Tarvainen, S. Tonelli, S. Vrochidis. "Getting the environmental information across: From the web to the user". Expert Systems, 15 December 2014. OPEN ACCESS
  69. A. Moumtzidou, S. Vrochidis, I. Kompatsiaris, "Discovery of Weather Forecast Web Resources based on Ontology and Content-driven Hierarchical Classification", in Proceedings of 14th International Conference on Engineering Applications of Neural Networks (EANN 2013), Halkidiki, Greece, 13-16 September, 2013. Communi-cations in Computer and Information Science, Springer Berlin Heidelberg, Vol. 383, pp. 223-232.
  70. L. Wanner, M. Rospocher, S. Vrochidis, H. Bosch, N. Bouayad-Agha, U. Bugel, G. Casamayor, T. Ertl, D. Hil-bring, A. Karppinen, I. Kompatsiaris, T. Koskentalo, S. Mille, J. Mossgraber, A. Moumtzidou, M. Myllynen, E. Pianta, H. Saggion, L. Serafini, V. Tarvainen and S. Tonelli, "Personalized Environmental Service Configuration and Delivery Orchestration: The PESCaDO Demonstrator", in Proceedings of the 9nth Extended Semantic Web Conference (ESWC 2012), Heraclion, Crete, Greece, May 27-31, 2012. https://doi.org/10.1007/978-3-662-46641-4_41
  71. L. Wanner, S. Vrochidis, S. Tonelli, J. Mossgraber, H. Bosch, A. Karppinen, M. Myllynen, M. Rospocher, N. Bouayad-Agha, U. Brugel, G. Casamayor, T. Ertl, I. Kompatsiaris, T. Koskentalo, S. Mille, A. Moumtzidou, E. Pianta, H. Saggion, L. Serafini, V. Tarvainen, "Building an Environmental Information System for Personalized Content Delivery", in International Symposium on Environmental Software Systems (ISESS 2011), Brno, Czech Republic, June 2011. https://doi.org/10.1007/978-3-642-22285-6_19
  72. S. Vrochidis, C. Doulaverakis, A. Gounaris, E. Nidelkou, L. Makris and I. Kompatsiaris. "A Hybrid Ontology and Visual-based Retrieval Model for Cultural Heritage Multimedia Collections". International Journal of Metadata, Semantics and Ontologies, Vol.3, No. 3, pp. 167-182, 28 February 2009. OPEN ACCESS
  73. S. Vrochidis, C. Doulaverakis, A. Gounaris, E. Nidelkou, L. Makris and I. Kompatsiaris, "A Hybrid Ontology and Visual-based Retrieval Model for Cultural Heritage Multimedia Collections", in Proceedings of 2nd International Conference on Metadata and Semantics Research, Metadata and Semantics, 11-12 October, Corfu, Greece, 2007, Springer US, pp. 1-10. https://doi.org/10.1007/978-0-387-77745-0_1
  74. S. Vrochidis, C. Doulaverakis, L. Makris, A. Gounaris, E. Nidelkou, I. Kompatsiaris and M. G. Strintzis, "Hybrid Ontology and Visual-based Retrieval for Cultural Heritage Multimedia Libraries", in 14th International Conference of Image Analysis and Processing - Workshops, 10-13 September 2007, Modena, Italy. DOI: 10.1109/ICIAPW.2007.28