Spatial, textual and visual data are ubiquitous and are massively generated by cameras, satellites, sensors and humans. Clustering large and semi-structured data is a very popular pattern recognition problem in the Big Data era, that aims to support data management and grouping into topics. Our research focus is to identify groups of textual and/or visual content that pose a high semantic relevance within each group and low similarity between different groups of documents, i.e. news articles, short texts, social images, satellite images, etc. The estimation of the number of topics to detect is a computationally complex problem that requires effective parallel programming methods and efficient computational resources, such as cloud and High Performance Computing environments.
Migration
PROJECTS
PUBLICATIONS
- G. Meditskos, S. Tegos, C. Bouas, A. Tassios, K. Manousaridis, M. Papoutsoglou, T. Mavropoulos, S. Vrochidis, "Towards Semantically Conscious, Conversation-Based Chatbot Services for Migrants" in Artificial Intelligence Applications and Innovations, I. Maglogiannis, L. Iliadis, J. Macintyre, M. Avlonitis, and A. Papaleonidas, Eds. Cham, Switzerland: Springer Nature Switzerland, 2024, pp. 139-148. OPEN ACCESS
- G. Tzionis, G. Antzoulatos, P. Papaioannou, A. Mavropoulos, I. Gialampoukidis, M. González Burgos, S. Vrochidis, I. Kompatsiaris, & M. Vlachopoulou, "Evaluation of Explainable Artificial Intelligence methods in Language Learning Classification of Spanish Tertiary Education Students". In 15th International Conference on Interactive Mobile Communication Technologies and Learning, IMCL 2023, Thessaloniki, Greece, November 9, 2023. OPEN ACCESS
- Stathopoulos EA, Karageorgiadis AI, Kokkalas A, Diplaris S, Vrochidis S, Kompatsiaris I. A Query Expansion Benchmark on Social Media Information Retrieval: Which Methodology Performs Best and Aligns with Semantics? Computers. 2023; 12(6):119. https://doi.org/10.3390/computers12060119 OPEN ACCESS
- 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
- 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
- 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
- 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.
- 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
- 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.
- 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.
- 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.
- 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
- 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
- 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