Sotirios Chatzis

Publication Activity (10 Years)

Years Active: 2006-2024
Publications (10 Years): 44

Top Topics

Imbalanced Datasets

Transport Network

Top Venues

Inf. Comput. Secur.

Publications

Theodoros Christophides, Kyriakos Tolias, Sotirios Chatzis
Continual Deep Learning on the Edge via Stochastic Local Competition among Subnetworks. CoRR (2024)
Andreas Voskou, Charalambos Christoforou, Sotirios Chatzis
Transformers with Stochastic Competition for Tabular Data Modelling. CoRR (2024)
Ioannis Stylios, Sotirios Chatzis, Olga Thanou, Spyros Kokolakis
Continuous authentication with feature-level fusion of touch gestures and keystroke dynamics to solve security and usability issues. Comput. Secur. 132 (2023)
Konstantinos P. Panousis, Sotirios Chatzis
DISCOVER: Making Vision Networks Interpretable via Competition and Dissection. CoRR (2023)
Andreas Voskou, Konstantinos P. Panousis, Harris Partaourides, Kyriakos Tolias, Sotirios Chatzis
A New Dataset for End-to-End Sign Language Translation: The Greek Elementary School Dataset. CoRR (2023)
Konstantinos P. Panousis, Sotirios Chatzis
DISCOVER: Making Vision Networks Interpretable via Competition and Dissection. NeurIPS (2023)
Andreas Voskou, Konstantinos P. Panousis, Harris Partaourides, Kyriakos Tolias, Sotirios Chatzis
A New Dataset for End-to-End Sign Language Translation: The Greek Elementary School Dataset. ICCV (Workshops) (2023)
Lei Cheng, Feng Yin, Sergios Theodoridis, Sotirios Chatzis, Tsung-Hui Chang
Rethinking Bayesian Learning for Data Analysis: The Art of Prior and Inference in Sparsity-Aware Modeling. CoRR (2022)
Konstantinos P. Panousis, Anastasios Antoniadis, Sotirios Chatzis
Competing Mutual Information Constraints with Stochastic Competition-Based Activations for Learning Diversified Representations. AAAI (2022)
Ioannis Stylios, Spyros Kokolakis, Andreas Skalkos, Sotirios Chatzis
BioGames: a new paradigm and a behavioral biometrics collection tool for research purposes. Inf. Comput. Secur. 30 (2) (2022)
Ioannis Stylios, Spyros Kokolakis, Olga Thanou, Sotirios Chatzis
Key factors driving the adoption of behavioral biometrics and continuous authentication technology: an empirical research. Inf. Comput. Secur. 30 (4) (2022)
Lei Cheng, Feng Yin, Sergios Theodoridis, Sotirios Chatzis, Tsung-Hui Chang
Rethinking Bayesian Learning for Data Analysis: The art of prior and inference in sparsity-aware modeling. IEEE Signal Process. Mag. 39 (6) (2022)
Anastasios Petropoulos, Vasilis Siakoulis, Konstantinos P. Panousis, Loukas Papadoulas, Sotirios Chatzis
A Deep Learning Approach for Dynamic Balance Sheet Stress Testing. ICAIF (2022)
Konstantinos P. Panousis, Anastasios Antoniadis, Sotirios Chatzis
Competing Mutual Information Constraints with Stochastic Competition-based Activations for Learning Diversified Representations. CoRR (2022)
Konstantinos Kalais, Sotirios Chatzis
Stochastic Deep Networks with Linear Competing Units for Model-Agnostic Meta-Learning. CoRR (2022)
Konstantinos Kalais, Sotirios Chatzis
Stochastic Deep Networks with Linear Competing Units for Model-Agnostic Meta-Learning. ICML (2022)
Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Stochastic Local Winner-Takes-All Networks Enable Profound Adversarial Robustness. CoRR (2021)
Andreas Voskou, Konstantinos P. Panousis, Dimitrios Kosmopoulos, Dimitris N. Metaxas, Sotirios Chatzis
Stochastic Transformer Networks with Linear Competing Units: Application to end-to-end SL Translation. ICCV (2021)
Konstantinos P. Panousis, Sotirios Chatzis, Antonios Alexos, Sergios Theodoridis
Local Competition and Stochasticity for Adversarial Robustness in Deep Learning. AISTATS (2021)
Sergis Nicolaou, Lambros Mavrides, Georgina Tryfou, Kyriakos Tolias, Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Dialog Speech Sentiment Classification for Imbalanced Datasets. SPECOM (2021)
Andreas Voskou, Konstantinos P. Panousis, Dimitrios Kosmopoulos, Dimitris N. Metaxas, Sotirios Chatzis
Stochastic Transformer Networks with Linear Competing Units: Application to end-to-end SL Translation. CoRR (2021)
Anastasios Petropoulos, Vasilis Siakoulis, Panagiotis Lazaris, Sotirios Chatzis
Re-constructing the interbank links using machine learning techniques. An application to the Greek interbank market. Intell. Syst. Appl. 12 (2021)
Ioannis Stylios, Spyros Kokolakis, Olga Thanou, Sotirios Chatzis
Behavioral biometrics & continuous user authentication on mobile devices: A survey. Inf. Fusion 66 (2021)
Harris Partaourides, Andreas Voskou, Dimitrios Kosmopoulos, Sotirios Chatzis, Dimitris N. Metaxas
Variational Bayesian Sequence-to-Sequence Networks for Memory-Efficient Sign Language Translation. CoRR (2021)
Sergis Nicolaou, Lambros Mavrides, Georgina Tryfou, Kyriakos Tolias, Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Dialog speech sentiment classification for imbalanced datasets. CoRR (2021)
Konstantinos P. Panousis, Sotirios Chatzis, Antonios Alexos, Sergios Theodoridis
Local Competition and Stochasticity for Adversarial Robustness in Deep Learning. CoRR (2021)
Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Variational Conditional-Dependence Hidden Markov Models for Human Action Recognition. CoRR (2020)
Christos Kleanthous, Theodoros Christophides, Sotirios Chatzis
Power-law mixtures of bayesian forests for value added tax audit case selection. ICAIF (2020)
Christos Kleanthous, Sotirios Chatzis
Gated Mixture Variational Autoencoders for Value Added Tax audit case selection. Knowl. Based Syst. 188 (2020)
Antonios Alexos, Konstantinos P. Panousis, Sotirios Chatzis
Local Competition and Uncertainty for Adversarial Robustness in Deep Learning. CoRR (2020)
Harris Partaourides, Andreas Voskou, Dimitrios Kosmopoulos, Sotirios Chatzis, Dimitris N. Metaxas
Variational Bayesian Sequence-to-Sequence Networks for Memory-Efficient Sign Language Translation. ISVC (2) (2020)
Harris Partaourides, Kostantinos Papadamou, Nicolas Kourtellis, Ilias Leontiadis, Sotirios Chatzis
A Self-Attentive Emotion Recognition Network. ICASSP (2020)
Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Nonparametric Bayesian Deep Networks with Local Competition. ICML (2019)
Harris Partaourides, Kostantinos Papadamou, Nicolas Kourtellis, Ilias Leontiadis, Sotirios Chatzis
A Self-Attentive Emotion Recognition Network. CoRR (2019)
Aristotelis Charalampous, Sotirios Chatzis
Quantum Statistics-Inspired Neural Attention. CoRR (2018)
Konstantinos P. Panousis, Sotirios Chatzis, Sergios Theodoridis
Nonparametric Bayesian Deep Networks with Local Competition. CoRR (2018)
Harris Partaourides, Sotirios Chatzis
Deep learning with t-exponential Bayesian kitchen sinks. CoRR (2018)
Kyriakos Tolias, Sotirios Chatzis
t-Exponential Memory Networks for Question-Answering Machines. CoRR (2018)
Sotirios Chatzis, Aristotelis Charalampous, Kyriacos Tolias, Sotiris A. Vassou
Amortized Context Vector Inference for Sequence-to-Sequence Networks. CoRR (2018)
Harris Partaourides, Sotirios Chatzis
-exponential Bayesian kitchen sinks. Expert Syst. Appl. 98 (2018)
Savvas Zannettou, Sotirios Chatzis, Kostantinos Papadamou, Michael Sirivianos
The Good, the Bad and the Bait: Detecting and Characterizing Clickbait on YouTube. IEEE Symposium on Security and Privacy Workshops (2018)
Sotirios Chatzis, Panayiotis Christodoulou, Andreas S. Andreou
Recurrent Latent Variable Networks for Session-Based Recommendation. CoRR (2017)
Ioannis Stylios, Spyros Kokolakis, Olga Thanou, Sotirios Chatzis
Users' Attitudes on Mobile Devices: Can Users' Practices Protect their Sensitive Data? MCIS (2016)
Sotirios Chatzis, Dimitrios I. Kosmopoulos, George Papadourakis
A Nonstationary Hidden Markov Model with Approximately Infinitely-Long Time-Dependencies. Int. J. Artif. Intell. Tools 25 (5) (2016)
Dimitrios I. Kosmopoulos, M. Kalohristianakis, A. Malamos, Sotirios Chatzis, M. Pternea, Konstantinos L. Kepaptsoglou, Matthew G. Karlaftis
Developing Public Transport Network systems: The DIANA approach. Panhellenic Conference on Informatics (2014)
Sotirios Chatzis
Echo-State Conditional Restricted Boltzmann Machines. AAAI (2014)
Sotirios Chatzis
Dynamic Bayesian Probabilistic Matrix Factorization. AAAI (2014)
Sotirios Chatzis
Infinite Markov-Switching Maximum Entropy Discrimination Machines. ICML (3) (2013)
Sotirios Chatzis
Nonparametric bayesian multitask collaborative filtering. CIKM (2013)
Sotirios Chatzis, Dimitrios I. Kosmopoulos
A variational Bayesian methodology for hidden Markov models utilizing Student's-t mixtures. Pattern Recognit. 44 (2) (2011)
Sotirios Chatzis
A method for training finite mixture models under a fuzzy clustering principle. Fuzzy Sets Syst. 161 (23) (2010)
Dimitrios I. Kosmopoulos, Anastasios D. Doulamis, Alexandros Makris, Nikolaos D. Doulamis, Sotirios Chatzis, Stuart E. Middleton
Vision-based production of personalized video. Signal Process. Image Commun. 24 (3) (2009)
Sotirios Chatzis, Dimitrios I. Kosmopoulos, Theodora A. Varvarigou
Robust Sequential Data Modeling Using an Outlier Tolerant Hidden Markov Model. IEEE Trans. Pattern Anal. Mach. Intell. 31 (9) (2009)
Sotirios Chatzis, Theodora A. Varvarigou
Factor Analysis Latent Subspace Modeling and Robust Fuzzy Clustering Using t -Distributions. IEEE Trans. Fuzzy Syst. 17 (3) (2009)
Sotirios Chatzis, Dimitrios I. Kosmopoulos, Theodora A. Varvarigou
A robust approach towards sequential data modeling and its application in automatic gesture recognition. ICASSP (2008)
Antonios Litke, Kleopatra Konstanteli, Vassiliki Andronikou, Sotirios Chatzis, Theodora A. Varvarigou
Managing service level agreement contracts in OGSA-based Grids. Future Gener. Comput. Syst. 24 (4) (2008)
Sotirios Chatzis, Theodora A. Varvarigou
Robust fuzzy clustering using mixtures of Student's-t distributions. Pattern Recognit. Lett. 29 (13) (2008)
Sotirios Chatzis, Theodora A. Varvarigou
A Fuzzy Clustering Approach Toward Hidden Markov Random Field Models for Enhanced Spatially Constrained Image Segmentation. IEEE Trans. Fuzzy Syst. 16 (5) (2008)
Sotirios Chatzis, Dimitrios I. Kosmopoulos, Theodora A. Varvarigou
Signal Modeling and Classification Using a Robust Latent Space Model Based on t Distributions. IEEE Trans. Signal Process. 56 (3) (2008)
Sotirios Chatzis, Anastasios D. Doulamis, Theodora A. Varvarigou
A content-based image retrieval scheme allowing for robust automatic personalization. CIVR (2007)
Sotirios Chatzis, Anastasios D. Doulamis, Dimitrios I. Kosmopoulos, Theodora A. Varvarigou
Video Representation and Retrieval Using Spatio-temporal Descriptors and Region Relations. ICANN (2) (2006)
Vasilios Anagnostopoulos, Sotirios Chatzis, Constantinos Lalos, Anastasios D. Doulamis, Dimitrios I. Kosmopoulos, Theodora A. Varvarigou, Helmut Neuschmied, Georg Thallinger, Stuart E. Middleton, Matthew Addis, Eduardo Bustos, Fabrizio Giorgini
A Cross Media Platform for Personalized Leisure & Entertainment: The POLYMNIA Approach. AXMEDIS (2006)