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105 results on '"Kostoulas, Theodoros"'

2. IDEAL-CITIES: A Trustworthy and Sustainable Framework for Circular Smart Cities

Author

Angelopoulos, Constantinos Marios, Katos, Vasilios, Kostoulas, Theodoros, Miaoudakis, Andreas, Petroulakis, Nikolaos, Alexandris, George, Demetriou, Giorgos, Morandi, Giuditta, Waledzik, Karolina, Rak, Urszula, Panayiotou, Marios, and Tsatsoulis, Christos Iraklis

Subjects
Computer Science - Human-Computer Interaction
Abstract

Reflecting upon the sustainability challenges cities will be facing in the near future and the recent technological developments allowing cities to become "smart", we introduce IDEAL-CITIES; a framework aiming to provide an architecture for cyber-physical systems to deliver a data-driven Circular Economy model in a city context. In the IDEAL-CITIES ecosystem, the city's finite resources as well as citizens will form the pool of intelligent assets in order to contribute to high utilization through crowdsourcing and real-time decision making and planning. We describe two use cases as a vehicle to demonstrate how a smart city can serve the Circular Economy paradigm.

Published
2019

3. Online Peer Support Groups to Combat Digital Addiction: User Acceptance and Rejection Factors

Author

Aldhayan, Manal, Cham, Sainabou, Kostoulas, Theodoros, Almourad, Mohamed Basel, Ali, Raian, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Rocha, Álvaro, editor, Adeli, Hojjat, editor, Reis, Luís Paulo, editor, and Costanzo, Sandra, editor

Published
2019
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4. Problematic Attachment to Social Media: Lived Experience and Emotions

Author

Altuwairiqi, Majid, Kostoulas, Theodoros, Powell, Georgina, Ali, Raian, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Rocha, Álvaro, editor, Adeli, Hojjat, editor, Reis, Luís Paulo, editor, and Costanzo, Sandra, editor

Published
2019
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7. The epidemic volatility index, a novel early warning tool for identifying new waves in an epidemic

Author

Kostoulas, Polychronis, Meletis, Eletherios, Pateras, Konstantinos, Eusebi, Paolo, Kostoulas, Theodoros, Furuya-Kanamori, Luis, Speybroeck, Niko, Denwood, Matthew, Doi, Suhail A. R., Althaus, Christian L., Kirkeby, Carsten, Rohani, Pejman, Dhand, Navneet K., Peñalvo, José L., Thabane, Lehana, BenMiled, Slimane, Sharifi, Hamid, and Walter, Stephen D.

Published
2021
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11. Affect Recognition in Real Life Scenarios

Author

Kostoulas, Theodoros, Ganchev, Todor, Fakotakis, Nikos, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Esposito, Anna, editor, Esposito, Antonietta M., editor, Martone, Raffaele, editor, Müller, Vincent C., editor, and Scarpetta, Gaetano, editor

Published
2011
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15. Enhancing Emotion Recognition from Speech through Feature Selection

Author

Kostoulas, Theodoros, Ganchev, Todor, Lazaridis, Alexandros, Fakotakis, Nikos, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Sojka, Petr, editor, Horák, Aleš, editor, Kopeček, Ivan, editor, and Pala, Karel, editor

Published
2010
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16. Feature Selection for Improved Phone Duration Modeling of Greek Emotional Speech

Author

Lazaridis, Alexandros, Ganchev, Todor, Mporas, Iosif, Kostoulas, Theodoros, Fakotakis, Nikos, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Konstantopoulos, Stasinos, editor, Perantonis, Stavros, editor, Karkaletsis, Vangelis, editor, Spyropoulos, Constantine D., editor, and Vouros, George, editor

Published
2010
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18. Study on Speaker-Independent Emotion Recognition from Speech on Real-World Data

Author

Kostoulas, Theodoros, Ganchev, Todor, Fakotakis, Nikos, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Esposito, Anna, editor, Bourbakis, Nikolaos G., editor, Avouris, Nikolaos, editor, and Hatzilygeroudis, Ioannis, editor

Published
2008
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25. Detection of AdvancedWeb Bots by CombiningWeb Logs with Mouse Behavioural Biometrics

Author

Iliou, Christos, Kostoulas, Theodoros, Tsikrika, Theodora, Katos, Vasilis, Vrochidis, Stefanos, and Kompatsiaris, Ioannis

Subjects
ComputingMilieux_PERSONALCOMPUTING, Web bot detection, evasive web bots, advanced web bots, mouse movements, mouse biometrics, humanlike behaviour
Abstract

Web bots vary in sophistication based on their purpose, ranging from simple automated scripts to advanced web bots that have a browser fingerprint, support the main browser functionalities, and exhibit a humanlike behaviour. Advanced web bots are especially appealing to malicious web bot creators, due to their browser-like fingerprint and humanlike behaviour which reduce their detectability. This work proposes a web bot detection framework that comprises two detection modules: (i) a detection module that utilises web logs, and (ii) a detection module that leverages mouse movements. The framework combines the results of each module in a novel way to capture the different temporal characteristics of the web logs and the mouse movements, as well as the spatial characteristics of the mouse movements. We assess its effectiveness on web bots of two levels of evasiveness, (a) moderate web bots that have a browser fingerprint and (b) advanced web bots that have a browser fingerprint and also exhibit a humanlike behaviour. We show that combining web logs with visitors’ mouse movements is more effective and robust towards detecting advanced web bots that try to evade detection, as opposed to using only one of those approaches.

Published
2021

26. Remote Collection of Physiological Data in a Virtual Reality Study

Author

Gnacek, Michal, Seiss, Ellen, Kostoulas, Theodoros, Balaguer-Ballester, Emili, Mavridou, Ifigeneia, and Nduka, C.

Abstract

Recent pandemic related events have effectively put a stop to most in-lab data collection which has a profound negative\ud impact on many research fields. Online and remote data collection, without the need to travel to a laboratory, starts to be\ud used as a valuable alternative in some scenarios. This approach does not only help to resume some research activities, it\ud also has an enormous potential to change how research is conducted in future. With the use of our biometric sensing system\ud for Virtual Reality (emteqGO), we designed a VR experience autonomously guiding participants through the study. The\ud combination of hardware posted to participants, alongside software solutions handling the setup, data collection, quality\ud assurance and upload for immediate access enables a fully remote, unsupervised approach to data collection. While this\ud approach might be the only feasible solution for some researchers, it has also laid the groundwork for possible future direction\ud of research where remote data collection isa new way to enhance access to participants who typically would not travel to the\ud laboratories. In designing these solutions, we found that for unsupervised remote data collection to work effectively, setup\ud procedures must be easy to follow to obtain high quality data and the entire process must be highly robust, reliable, and built\ud with a high degree of redundancy. Post-pandemic, there are many benefits of an ongoing use of remote research paradigms.\ud These include ameliorating the diversity problem afflicting current research by widening the participant pool, improved\ud research quality by collecting data in more naturalistic environments, and improving protocol standardisation using virtual\ud reality.

Published
2021

29. The Epidemic Volatility Index: an early warning tool for epidemics

Author

Kostoulas, Polychronis, primary, Meletis, Eletherios, additional, Pateras, Konstantinos, additional, Eusebi, Paolo, additional, Kostoulas, Theodoros, additional, Speybroeck, Niko, additional, Denwood, Matthew, additional, Doi, Suhail A.R., additional, Althaus, Christian L., additional, Kirkeby, Carsten, additional, Rohani, Pejman, additional, Dhand, Navneet K., additional, Peñalvo, José L., additional, Furuya-Kanamori, Luis, additional, Thabane, Lehana, additional, BenMiled, Slimane, additional, Sharifi, Hamid, additional, and Walter, Stephen, additional

Published
2021
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39. Emerging Affect Detection Methodologies in VR and future\ud directions

Author

Mavridou, Ifigeneia, Perry, M., Seiss, Ellen, Kostoulas, Theodoros, and Balaguer-Ballester, Emili

Abstract

The uses of Virtual reality are constantly evolving, from healthcare treatments to evaluating commercial products, all of which would benefit from a better understanding of the emotional state of the individual. There is ongoing research into developing specially adapted methods for the recognition of the user’s affect while immersed within Virtual Reality. This paper outlines the approaches attempted and the available methodologies that embed sensors into wearable devices for real-time affect detection. These emerging technologies are introducing innovative ways of studying and interpreting emotion related data produced within immersive experiences

Published
2019

42. IDEAL-CITIES - A Trustworthy and Sustainable Framework for Circular Smart Cities

Author

Angelopoulos, Constantinos Marios, primary, Katos, Vasilios, additional, Kostoulas, Theodoros, additional, Miaoudakis, Andreas, additional, Petroulakis, Nikolaos, additional, Alexandris, George, additional, Demetriou, Giorgos, additional, Morandi, Giuditta, additional, Rak, Urszula, additional, Waledzik, Karolina, additional, Panayiotou, Marios, additional, and Tsatsoulis, Christos Iraklis, additional

Published
2019
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46. Empowering responsible online gambling by real-time persuasive information systems

Author

Drosatos, George, primary, Nalbadis, Fotis, additional, Arden-Close, Emily, additional, Baines, Victoria, additional, Bolat, Elvira, additional, Vuillier, Laura, additional, Kostoulas, Theodoros, additional, Wasowska, Sonia, additional, Bonello, Maris, additional, Palles, Jane, additional, McAlaney, John, additional, Phalp, Keith, additional, and Ali, Raian, additional

Published
2018
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