About

My main research interests are: language analysis, computer-human interaction, usability,
accessibility, voice interaction, and social media analysis.
I have a PhD in Computer Science (University of Athens), an MPhil in Computation (UMIST),
an MA in Linguistics (University of Manchester) and a BSc in Computation (UMIST).
Currenty working on the EU-funded project Roxanne.


LDA topic model of referendum entities

Social Media Analysis during Political Turbulence, PLoS ONE, 2017

An in-depth exploratory analysis of Twitter posts for two major political events, a referendum and the follow-up elections revealed hidden aspects of public sentiment towards political actors. This work combined five types of analysis: volume analysis, entity identification, sentiment detection, sarcasm correction and topic analysis. Main findings include the co-enhancement of results between the types of analysis and the quantitative aspects of data analytics visualized for social and political interpretations. Worries, fears and other sentiments provide insight to the mindset of the citizens as they were called upon to decide on their future. read more


Publications

Journals

  1. Margaris, D., Vassilakis, C., Spiliotopoulos, D., 2019. Handling uncertainty in social media textual information for improving venue recommendation formulation quality in social networks. Social Network Analysis and Mining 9(1): 64.
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  2. Antonakaki, D., Spiliotopoulos, D., Samaras, C.V., Pratikakis, P., Ioannidis, S., Fragopoulou, P. 2017. Social media analysis during political turbulence. PLOS ONE 12(10): e0186836, 1-23.
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  3. Risse, T., Demidova, E., Dietze, S., Peters, W., Papailiou, N., Doka, K., Stavrakas, Y., Plachouras, V., Senellart, P., Carpentier, F., Mantrach, A., Cautis, B., Siehndel, P., Spiliotopoulos, D. 2014. The ARCOMEM Architecture for Social and Semantic Driven Web Archiving. Future Internet 6(4):688-716.
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  4. Demidova, E., Barbieri, N., Dietze, S., Funk, A., Holzmann, H., Maynard, D., Papailiou, N., Peters, W., Risse, T., Spiliotopoulos, D. 2014. Analysing and Enriching Focused Semantic Web Archives for Parliament Applications. Future Internet 6(3):433-456.
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  5. Hendley, R., Beale, R., Georgousopoulos, C., Vassiliou, C., Petridis, S., Moeller, R., Karstens, E., Spiliotopoulos, D. 2014. CASAM: Collaborative Human-Machine Annotation of Multimedia. Multimedia Tools and Applications 70(2):1277-1308.
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  6. Spiliotopoulos, D., Xydas, G., Kouroupetroglou, G., Argyropoulos, V., Ikospentaki, K. 2010. Auditory Universal Accessibility of Data Tables using Naturally Derived Prosody Specification. Univ Access Inf Soc 9:169-183.
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  7. Kouroupetroglou, G., Spiliotopoulos, D. 2009. Usability Methodologies for Real-Life Voice User Interfaces. Int. Journal of Information Technology and Web Engineering 4(4):78-94.
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  8. Xydas, G., Spiliotopoulos, D., Kouroupetroglou, G. 2005. Modeling Improved Prosody Generation from High-Level Linguistically Annotated Corpora. IEICE Trans. of Inf. and Syst. E88-D(3):510-518.
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Conferences

  1. Spiliotopoulos, D., Margaris, D., Vassilakis, C. 2019. Citizen Engagement for Transparent and Accountable Policy Modelling. In Proc. 11th International ACM Conference on Management of Digital EcoSystems (MEDES'19), pp. 1-8, Limassol, Cyprus, 12-14 November 2019. (accepted/preprint)
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  2. Spiliotopoulos, D., Margaris, D., Vassilakis, C., Petukhova, V., Kotis, K. 2019. A Mixed-reality Interaction-driven Game-based Learning Framework. In Proc. 11th International ACM Conference on Management of Digital EcoSystems (MEDES'19), pp. 1-8, Limassol, Cyprus, 12-14 November 2019. (accepted/preprint)
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  3. Margaris, D., Spiliotopoulos, D., Vassilakis, C. 2019. Improving Collaborative Filtering's Rating Prediction Quality by Exploiting the Item Adoption Eagerness Information. In Proc. IEEE/WIC/ACM International Conference on Web Intelligence (WI 2019), pp. 1-6, Thessaloniki, Greece, 14–17 October 2019. (accepted/preprint)
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  4. Spiliotopoulos, D., Vassilakis, C., Margaris, D. 2019. Data-driven Country Safety Monitoring Terrorist Attack Prediction. In Proc. IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2019), pp. 1-8, Vancouver, Canada, 27-30 August 2019. (preprint)
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  5. Margaris, D., Spiliotopoulos, D., Vassilakis, C. 2019. Social Relations versus Near Neighbours: Reliable Recommenders in Limited Information Social Network Collaborative Filtering for Online Advertising. In Proc. IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2019), pp. 1-8, Vancouver, Canada, 27-30 August 2019. (preprint)
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  6. Margaris, D., Vasilopoulos, D., Vassilakis, C., Spiliotopoulos, D. 2019. Improving Collaborative Filtering's Rating Prediction Coverage in Sparse Datasets through the Introduction of Virtual Near Neighbors. In Proc. 10th IEEE International Conference on Information, Intelligence, Systems and Applications, pp. 1-8, Patra, Greece, 16-18 July 2019.
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  7. Margaris, D., Vasilopoulos, D., Vassilakis, C., Spiliotopoulos, D. 2019. Improving Collaborative Filtering's Rating Prediction Accuracy by Introducing the Common Item Rating Past Criterion. In Proc. 10th IEEE International Conference on Information, Intelligence, Systems and Applications, pp. 1-8, Patra, Greece, 16-18 July 2019. Best paper award
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  8. Spiliotopoulos, D., Vassilakis, C., Margaris, D., Kotis, K. 2019. A Methodology for Generated Text Annotation for High Quality Speech Synthesis. In Proc. IEEE International Conference on Information, Intelligence, Systems and Applications, pp. 1-8, Patra, Greece, 16-18 July 2019.
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  9. Makri, E., Koryzis, D., Spiliotopoulos, D., Svolopoulos, V. 2019. Metalogue's Virtual Agent for Negotiation: Its Effect On Learniing Experience, Metacognitive and Individual-and-Community-level Attitudes Pre-and-Post Interaction. In Proc. 11th Annual International Conference on Education and New Learning Technologies, pp. 1-10, Palma de Mallorca, Spain, 1-3 July 2019.
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  10. Varitimiadis, S., Tzortzakakis, A., Kotis, K., Tsekouras, G., Spiliotopoulos, D. 2019. Towards implementing an AI chatbot platform for museums. In Proc. 2nd International Conference on Cultural Informatics, Communication and Media Studies, pp. 1-8, Mitilini, Lesvos, 13-15 June 2019.
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  11. Petukhova, V., Malchanau, A., Oualil, Y., Klakow, D., Luz, S., Haider, F., Campbell, N., Koryzis, D., Spiliotopoulos, D., Albert, P., Linz, N., Alexandersson, J. 2018. The Metalogue Debate Trainee Corpus: Data Collection and Annotations. In Proc. International Conference on Language Resources and Evaluation (LREC-2018), pp. 1-7, Miyazaki, Japan, 7-12 May 2018.
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  12. Aivazoglou, M., Roussos, O., Ioannidis, S., Spiliotopoulos, D., Polakis, J. 2017. Reveal: Fine Grained Recommendations in a Social Ecosystem. In Proc. IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2017), pp. 1-4, Sydney, Australia, 31 July - 03 August 2017.
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  13. Fitsilis F., Koryzis D., Svolopoulos V., Spiliotopoulos D. 2017. Implementing Digital Parliament Innovative Concepts for Citizens and Policy Makers. In Proc. 19th International Conference in Human-Computer Interaction, LNCS 10293, pp. 154–170, Springer, Vancouver, Canada, 9-14 July 2017.
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  14. Koryzis, D., Samaras, CV., Makri, E., Svolopoulos, V., Spiliotopoulos, D. 2017. Visual Cue Streams for Multimodal Dialogue Interaction. In Proc. Advances in Human Factors, Business Management, Training and Education, pp. 541-547, Florida, USA.
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  15. Antonakaki, D., Spiliotopoulos, D., Samaras, C., Ioannidis, S., Fragopoulou, P. 2016. Investigating the complete corpus of Referendum and Elections tweets. In Proc. 2016 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2016), pp. 1-6, San Francisco, CA, USA, 18-21 August 2016.
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  16. Spiliotopoulos, D., Antonakaki, D., Ioannidis, S., Fragopoulou, P. 2016. Motivation Effect of Social Media Posts about Well-being and Healthy Living. In Proc. 9th ACM International Conference on Pervasive Technologies Related to Assistive Environments, pp. 1-4, Corfu, Greece, 29 June - 01 July 2016.
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  17. Spiliotopoulos, D., Antonakaki, D., Ioannidis, S., Fragopoulou, P. 2016. Usability Evaluation of Accessible Complex Graphs. In Proc. 15th International Conference on Computers Helping People with Special Needs, pp. 571-574, Linz, Austria, 13-15 July 2016.
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  18. Koryzis, D., Svolopoulos, V., Spiliotopoulos, D. 2016. Metalogue: A Multimodal Learning Journey. In Proc. 9th ACM International Conference on Pervasive Technologies Related to Assistive Environments, pp. 1-4, Corfu, Greece, 29 June - 01 July 2016.
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  19. Samaras, C., Tsioliaridou, N. A., Liaskos, C. K., Spiliotopoulos, D., Ioannidis, S. 2015. Enhancing the Trustworthiness of Service On-Demand Systems via Smart Vote Filtering. In Proc. 8th International Conference on Trust & Trustworthy Computing (TRUST 2015), pp. 88-103, Heraklion, Greece, 24-26 August, 2015.
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  20. Spiliotopoulos, D., Dalianis, A., Koryzis, D. 2015. Speech Enabled Ontology Graph Navigation and Editing. In Proc. 17th International Conference on Human-Computer Interaction (HCII 2015), LNCS 9175, pp. 487-494, Los Angeles, CA, USA, 2-7 August 2015.
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  21. Spiliotopoulos, D., Dalianis, A. 2014. Technically Challenging Human Factors Issues for a Policy Argumentation Approach. In Proc. 5th International Conference on Applied Human Factors and Ergonomics, pp. 1-4, Krakow, Poland, 19-23 July 2014.
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  22. Alexandersson, J., Girenko, A., Spiliotopoulos, D., Petukhova, V., Klakow, D., Koryzis, D., Taatgen, N., Specht, M., Campbell, N., Aretoulaki, M., Stricker, A., Gardner, M. 2014. Metalogue: A Multiperspective Multimodal Dialogue System with Metacognitive Abilities for Highly Adaptive and Flexible Dialogue Management. In Proc. 10th International Conference on Intelligent Environments (IE14), pp. 365-368, 2-4 July 2014, Shanghai, China.
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  23. Spiliotopoulos, D., Dalianis, A., Koryzis, D. 2014. Need driven Prototype Design for a Policy Modeling Authoring Interface. In Proc. 16th International Conference on Human-Computer Interaction (HCII 2014), pp. 481-487, Springer-Verlag Berlin Heidelberg.
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  24. Spiliotopoulos, D., Petukhova, V., Koryzis, D. 2014. Pilot Scenario Design for Evaluating a Metacognitive Skills Learning Dialogue System. In Proc. 16th International Conference on Human-Computer Interaction (HCII 2014), pp. 162-166, Springer-Verlag Berlin Heidelberg.
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  25. Spiliotopoulos, D., Dalianis, A., Kouroupetroglou, G. 2014. Accessibility Driven Design for Policy Argumentation Modelling, In Proc. 16th International Conference on Human-Computer Interaction (HCII 2014), pp. 101-108, Springer-Verlag Berlin Heidelberg.
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  26. Petasis, G., Spiliotopoulos, D., Tsirakis, N., Tsantilas, P. 2014. Sentiment Analysis for Reputation Management: Mining the Greek Web. In Proc. 8th Hellenic Conference in Artificial Intelligence, pp. 327-340, Springer-Verlag Berlin Heidelberg.
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  27. Spiliotopoulos, D., Bouwmeester, R., Proios, D. 2013. Relation Visualization for Semantically Enriched Web Content. In Proc. 1st Communicating Complexity International Design Conference (2CO-2013), 25-26 October 2013, Alghero, Italy.
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  28. Stavropoulou, P., Spiliotopoulos, D., Kouroupetroglou, G. 2013. Where Greek TtS Fails. In Proc. 11th International Conference on Greek Linguistics, 26-29 September 2013, Rhodes, Greece.
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  29. Papatheodorou, N., Stavropoulou, P., Tsonos, D., Kouroupetroglou, G., Papageorgiou, C., Spiliotopoulos, D. 2013. On the Identification and Annotation of Emotional Properties of Verbs. In Proc. On the Move to Meaningful Internet Systems (OTM 2013), LNCS 8186: 588-597, Springer-Verlag Berlin Heidelberg.
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  30. Spiliotopoulos, D., Tzoannos, E, Cabulea, C., Frey, D. 2013. Digital Archives: Semantic Search and Retrieval, In Proc. Human-Computer Interaction and Knowledge Discovery in Complex, Unstructured, Big Data. HCI-KDD-2013: 173-182, Springer-Verlag Berlin Heidelberg.
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  31. Spiliotopoulos, D., Bouwmeester, R., Kouroupetroglou, G., Stavropoulou, P., Tsonos, D. 2013. Usability design and testing of an interface for search and retrieval of semantic web data. In Proc. 15th International Conference on Human-Computer Interaction (HCII 2013), pp. 575-580, Springer-Verlag Berlin Heidelberg.
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  32. Spiliotopoulos, D., Stavropoulou, P., Kouroupetroglou, G., Tsonos, D. 2013. User Perception Knowledge for Socially-aware Web document Accessibility. In Proc. 15th International Conference on Human-Computer Interaction (HCII 2013), pp. 710-717, Springer-Verlag Berlin Heidelberg.
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  33. Spiliotopoulos, D., Bouwmeester, R., Frey, D., Kouroupetroglou, G., Stavropoulou, P. 2013. The Iterative Design and Evaluation Approach for a Socially-aware Search and Retrieval Application for Digital Archiving. In Proc. 6th International Conference on Advances in Computer-Human Interaction, pp. 157-161, Nice, France, 24 February - 1 March, 2013.
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  34. Spiliotopoulos, D., Schefbeck, G., Koryzis, D. 2013. Obtaining Societal Feedback on Legislative Issues through Content Extraction from the Social Web. In Proc. 16th International Symposium on Legal Informatics, pp. 1-4, 21-23 February 2013, Salzburg, Austria.
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  35. Schefbeck, G., Spiliotopoulos, D., Risse, T. 2012. The Recent Challenge in Web Archiving: Archiving the Social Web. International Council on Archives Congress, pp. 1-5, Brisbane, Australia, 20-24 August 2012.
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  36. Spiliotopoulos, D., Tzoannos, E., Stavropoulou, P., Kouroupetroglou, D., Pino, A. 2012. Designing user interfaces for social media driven digital preservation and information retrieval. In Proc. 13th International Conference on Computers Helping People with Special Needs, LNCS 7382, pp. 581-584.
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  37. Stavropoulou, P., Spiliotopoulos, D., Kouroupetroglou, D. 2012. Resource Evaluation for Usable Speech Interfaces: Utilizing Human–Human Dialogues. In Proc. 8th International Conference on Language Resources and Evaluation, Istanbul, Turkey, 23-25 May, 2012.
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  38. Stavropoulou, P., Spiliotopoulos, D., Kouroupetroglou, D. 2011. Acoustic modeling of dialogue elements for document accessibility. In Proc. 13th International Conference on Human-Computer Interaction (HCII 2011), LNCS 6768, pp. 175-184.
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  39. Pino, Α., Kouroupetroglou, G., Kacorri, H., Sarantidou, A., Spiliotopoulos, D. 2010. An Open Source / Freeware Assistive Technology Software Inventory. In Proc. 12th International Conference on Computers Helping People with Special Needs (ICCHP 2010), LNCS 6179, pp. 178–185 Springer-Verlag Berlin Heidelberg.
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  40. Stavropoulou, P., Spiliotopoulos, D., Kouroupetroglou, G. 2010. Integrating Contrast in a Framework for Predicting Prosody. In Proc. 11th International Conference on Computational Linguistics and Intelligent Text Processing (CICLing 2010), LNCS 6008, pp. 748-758, Springer Berlin Heidelberg.
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  41. Spiliotopoulos, D., Stavropoulou, P., Kouroupetroglou, G. 2009. Spoken Dialogue Interfaces: Integrating Usability. In Proc. 5th Symposium of the Austrian HCI and Usability Engineering Group, LNCS 5889, pp. 484-499, Springer Berlin Heidelberg.
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  42. Spiliotopoulos, D., Stavropoulou, P., Kouroupetroglou, G. 2009. Acoustic Rendering of Data Tables using Earcons and Prosody for Document Accessibility. In Proc. 13th International Conference on Human-Computer Interaction (HCII 2009), LNAI 5616, pp. 587-596, Springer Berlin Heidelberg.
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  43. Stavropoulou, P., Spiliotopoulos, D. 2009. Prosodic Realisation of Topics. In Proc. 19th International Symposium on Theoretical and Applied Linguistics, Thessaloniki, 3-5 April 2009, Greece.
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  44. Spiliotopoulos, D., Petasis, G., Kouroupetroglou, G. 2008. A Framework for Language-Independent Analysis and Prosodic Feature Annotation of Text Corpora. In Proc. 11th International Conference on Text, Speech and Dialogue (TSD 2008), LNAI 5246, pp. 517-524, Springer-Verlag Berlin Heidelberg.
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  45. Spiliotopoulos, D., Petasis, G., Kouroupetroglou, G. 2005. Prosodically Enriched Text Annotation for High Quality Speech Synthesis. In Proc. 10th International Conference on Speech and Computer (SPECOM-2005), 17-19 October 2005, Patras, Greece, pp. 313-316.
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  46. Spiliotopoulos, D., Xydas, G., Kouroupetroglou, G. 2005. Diction Based Prosody Modeling in Table-to-Speech Synthesis. Proc. 8th International Conference on Text, Speech and Dialogue (TSD 2005), LNAI 3658, pp. 294-301, Springer-Verlag Berlin Heidelberg.
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  47. Spiliotopoulos, D., Xydas, G., Kouroupetroglou, G., Argyropoulos, V. 2005. Experimentation on Spoken Format of Tables in Auditory User Interfaces. In Proc. 11th International Conference on Human-Computer Interaction (HCII-2005), pp. 1-10, Las Vegas, USA, 22-27 July, 2005.
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  48. Xydas, G., Spiliotopoulos, D., Kouroupetroglou, G. 2004. Modeling Prosodic Structures in Linguistically Enriched Environments. In Proc. International Conference on Text, Speech and Dialogue (TSD 2004), LNAI 3206, pp. 521-528, Springer-Verlag Berlin Heidelberg.
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  49. Xydas, G., Spiliotopoulos, D., Kouroupetroglou, G. 2003. Building Prosodic Structures in a Concept-to-Speech System. In Proc. 1st Balkan Conference on Informatics (BCI-2003), pp. 105-111, 21-23 November 2003, Thessaloniki, Greece.
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  50. Xydas, G., Spiliotopoulos, D., Kouroupetroglou, G. 2003. Prosody Prediction from Linguistically Enriched Documents Based on a Machine Learning Algorithm. In Proc. 6th International Conference of Greek Linguistics (ICGL-2003), Rethymno, Crete, Greece, 18-21 September 2003.
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  51. Xydas, G., Spiliotopoulos, D., Kouroupetroglou, G. 2003. Modelling Emphatic Events from Non-Speech Aware Documents in Speech Based User Interfaces. In Proc. 10th International Conference on Human-Computer Interaction (HCII-2003), pp. 806-810, 22-27 June, 2003, Crete, Greece.
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  52. Androutsopoulos, I., Spiliotopoulos, D., Stamatakis, K., Dimitromanolaki, A., Karkaletsis, V., Spyropoulos, C.D. 2002. Symbolic Authoring for Multilingual Natural Language Generation. In Proc. Hellenic Conference on Artificial Intelligence, LNAI 2308, pp. 131-142, Springer-Verlag Berlin Heidelberg.
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  53. Spiliotopoulos, D., Androutsopoulos, I., Spyropoulos, C.D. 2001. Human-Robot Interaction Based on Spoken Natural Language Dialogue. In Proc. European Workshop on Service and Humanoid Robots (ServiceRob-2001), Santorini, Greece, 25-27 June 2001.
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Book Chapters

  1. Spiliotopoulos, D., Kouroupetroglou, G., Stavropoulou, P. 2011. VoiceWeb: Spoken Dialogue Interfaces and Usability. In G. Alkhatib (Ed.), Web Engineered Applications for Evolving Organizations: Emerging Knowledge, pp. 340-359, Information Science Reference Press, Pennsylvania, USA.
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  2. Stavropoulou, P., Spiliotopoulos, D., Kouroupetroglou, G. 2010. Design and Development of an Automated Voice Agent: Theory and Practice Brought Together. In D. Perez-Marin and I. Pascual-Nieto (Eds.), Conversational Agents and Natural Language Interaction: Techniques and Effective Practices, pp. 335-359, Information Science Reference Press, Pennsylvania, USA.
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  3. Spiliotopoulos, D., Kouroupetroglou, G. 2010. Usability Methodologies for Spoken Dialogue Web Interfaces. In T. Spiliotopoulos, P. Papadopoulou and D. Martakos (Eds.), Integrating Usability Engineering for Designing the Web Experience: Methodologies and Principles, Chapter 8, pp. 149-165, Information Science Reference Press, Pennsylvania, USA.
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Abstracts and Technical Reports

  1. Spiliotopoulos, D., Cabulea, C., Frey, D. 2013. User Interaction Issues on Searching Digitally Archived Content. In Proc. Int. Workshop on Archiving Community Memories, 6 September 2013, Lisbon, Portugal.
  2. Spiliotopoulos, D., Koryzis, D., Schefbeck, G. 2014. Crowdsourcing and Transparency in the Legislative Process: The NOMAD Approach. In Proc. 17th Int. Symp. Legal Informatics, 20-22 February 2013, Salzburg, Austria.
  3. Del Pozo, A., Bywood, L., Georgakopoulou, Y., van Loenhout, G., Petukhova, V., Sepesy Maucec, M., Spiliotopoulos, D., Trespalacios, V., Volk, M., Way, A. 2012. SUMAT: An online service for SUbtitling by MAchine Translation. In Proc. 16th Annual Conference of the European Association for Machine Translation, Trento, Italy, 28-30 May, 2012.
  4. Spiliotopoulos, D., Androutsopoulos, I. 2000. A Survey of Spoken Dialogue Management Techniques. Technical Report DEMO 2000/15, NCSR “Demokritos”.

Dimitris Spiliotopoulos

Informatics and Telecommunications
University of the Peloponnese
Tripoli, Greece
Web: www.spiliotopoulos.org
Email: dspiliot (at) uop (dot) gr