RoPI Robotic Perception and Intelligence

Publications

All Publications

See also

2025

Sepsis Detection Exploiting Biomarker Analysis with Deep Neural Networks
D. Spanos, N. Passalis, D. Spasopoulos, E. Chatzianagnostou, J. C. R. Rodríguez, J. J. G. Lopez, L. M. Lechuga, M. C. Estévez, N. Pleros, A. Tefas
IEEE International Conference on Industrial Cyber-Physical Systems  ·  2025
Enhancing Large-scale Production Scheduling using Machine-Learning Techniques
M. E. Samouilidou, N. Passalis, G. Georgiadis, M. C. Goergiadis
European Symposium on Computer Aided Process Engineering  ·  2025
Reliable Uncertainty Estimation in Autonomous Systems via Feature Collapse Mitigation
D. Spanos, N. Passalis, A. Tefas
IEEE International Conference on Industrial Cyber-Physical Systems  ·  2025
Multiplicative Stochastic Gradient Descent for fast and robust deep learning training
M. Kirtas, N. Passalis, A. Tefas
International Joint Conference on Neural Networks  ·  2025
Robust Robotic Perception using Adaptive Multiplicative Optimization for Deep Reinforcement Learning
L. Avramelou, M. Kirtas, N. Passalis, A. Tefas
International Conference on Information, Intelligence, Systems and Applications  ·  2025
Model Merging for Deep Reinforcement Learning in Autonomous Financial Trading Systems
L. Avramelou, D. Litsidis, N. Passalis, A. Tefas
International Conference on Information, Intelligence, Systems and Applications  ·  2025
Embedded Real-Time Robotic Perception for Lightweight High-Resolution Weed Detection
E. Mpampis, N. Passalis, A. Tefas
International Conference on Information, Intelligence, Systems and Applications  ·  2025
Expert-guided Deep Reinforcement Learning for Autonomous Financial Asset Trading
I. Drossas, L. Avramelou, N. Passalis, A. Tefas
International Conference on Information, Intelligence, Systems and Applications  ·  2025
Perception-based Probabilistic Latent Space Matching for Anomaly Detection in Industrial Autonomous Systems
N. M. Panagiotopoulos, N. Passalis, A. Tefas
International Conference on Information, Intelligence, Systems and Applications  ·  2025
Single Pass Uncertainty Estimation in Q-Learning via Dropout Distillation
N. Kaparinos, N. Passalis, A. Tefas
International Joint Conference on Neural Networks  ·  2025
Integrating Contractive Loss in Proximal Policy Optimization for Robust Decision-Making
M. Dadopoulos, L. Avramelou, N. Passalis, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2025
Latent Behavior Cloning for Deep Reinforcement Learning Robotic Tasks
R. Voulgarakis, D. Katsikas, N. Passalis, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2025
New gravitational wave discoveries enabled by machine learning
A. Eleni Koloniari, E. Chrysovalantou Koursoumpa, P. Nousi, P. Lampropoulos, N. Passalis, A. Tefas, N. Stergioulas
Machine Learning: Science and Technology  ·  2025
Reaching the Peta-computing: 163.8 TOPS through Multidimensional AWGR-based Accelerators
C. Pappas, T. Moschos, A. Prapas, M. Kirtas, M. Moralis-Pegios, A. Tsakyridis, O. Asimopoulos, N. Passalis, A. Tefas, N. Pleros
Journal of Lightwave Technology  ·  2025
Residual Adaptive Input Normalization for Forecasting Renewable Energy Generation in Multiple Countries
N. Passalis, C. N. Dimitriadis, M. C. Georgiadis
Pattern Recognition Letters  ·  2025
Enhancing Industrial Scheduling through Machine Learning: A Synergistic Approach with Predictive Modeling and Clustering
Maria E. Samouilidou, Nikolaos Passalis, Georgios P. Georgiadis, M. C. Georgiadis
Computers and Chemical Engineering  ·  2025
A Deep Learning Framework for Photovoltaic Power Forecasting in Multiple Interconnected Countries
C. N. Dimitriadis, N. Passalis, M. C. Georgiadis
Sustainable Energy Technologies and Assessments  ·  2025
Explicit Bandwidth Learning for FOREX Trading Using Deep Reinforcement Learning
A. Nalmpantis, N. Passalis, A. Tefas
IEEE Signal Processing Letters  ·  2025
Leveraging active perception for real-time high-resolution pose estimation
T. Manousis, E. Eleftheriadis, N. Passalis, A. Tefas
Expert Systems with Applications  ·  2025
Sign potential-driven multiplicative optimization for robust deep reinforcement learning
L. Avramelou, M. Kirtas, N. Passalis, A. Tefas
Neural Networks  ·  2025
Inducing Neural Collapse via Anti-Classes and One-Cold Cross Entropy Loss
D. Katsikas, N. Passalis, A. Tefas
IEEE Transactions on Neural Networks and Learning Systems  ·  2025
Data efficient Deep Reinforcement Learning for Robust Inertial-based UAV Localization
D. Tsiakmakis, N. Passalis, A. Tefas
Robotics and Autonomous Systems  ·  2025

2024

Optics-informed Neural Networks: Bridging Deep Learning with Photonic Accelerators
M. Moralis-Pegios, A. Tsakyridis, C. Pappas, T. Moschos, G. Giamougiannis, …, I. Roumpos, M. Kirtas, N. Passalis, A. Tefas, N. Pleros
Optical Fiber Communication Conference  ·  2024
A TeraFLOP Photonic Matrix Multiplier using Time-Space-Wavelength Multiplexed AWGR-based Architectures
C. Pappas, T. Moschos, M. Moralis-Pegios, G. Giamougiannis, A. Tsakyridis, M. Kirtas, N. Passalis, A. Tefas, N. Pleros
Optical Fiber Communications Conference and Exhibition (OFC), 2024  ·  2024
Large Models in Dialogue for Active Perception and Anomaly Detection
D. Chamiti, N. Passalis, A. Tefas
International Conference on Pattern Recognition  ·  2024
Plasticity Driven Knowledge Transfer for Continual Deep Reinforcement Learning in Financial Trading
D. Katsikas, N. Passalis, A. Tefas
International Conference on Pattern Recognition  ·  2024
Multiplicative RMSprop Using Gradient Normalization for Learning Acceleration
M. Kirtas, N. Passalis, A. Tefas
International Conference on Pattern Recognition  ·  2024
Quantization-Aware Training for Multi-Agent Reinforcement Learning
N. Chandrinos, M. Amasialidis, M. Kirtas, K. Tsampazis, N. Passalis, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2024
Probabilistic Knowledge Transfer for Lightweight Vision Transformers
I. Bountouris, N. Passalis, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2024
Bi-Directional Knowledge Transfer For Continual Deep Reinforcement Learning in Financial Trading
D. Katsikas, N. Passalis, A. Tefas
IEEE 34th International Workshop on Machine Learning for Signal Processing  ·  2024
Mixed-precision quantization-aware training for photonic neural networks
M. Kirtas, N. Passalis, A. Oikonomou, M. Moralis-Pegios, G. Giamougiannis, A. Tsakyridis, G. Mourgias-Alexandris, N. Pleros, A. Tefas
Neural Computing and Applications  ·  2024
Deep residual error and bag-of-tricks learning for gravitational wave surrogate modelling
S.C. Fragkouli, P. Nousi, N. Passalis, P. Iosif, N. Stergioulas, A. Tefas
Applied Soft Computing  ·  2024
Photonic neural networks and optics-informed deep learning fundamentals
A. Tsakyridis, M. Moralis-Pegios, G. Giamougiannis, M. Kirtas, N. Passalis, A. Tefas, N. Pleros
APL Photonics  ·  2024
Robotic safe adaptation in unprecedented situations: the RoboSAPIENS project
P.G. Larsen, S. Ali, R. Behrens, A. Cavalcanti, C. Gomes, …, N. Passalis, T. Peyrucain, J. Tapia, A. Tefas, H. Zhang
Research Directions: Cyber-Physical Systems, 2024  ·  2024
Programmable Tanh- and ELU-based photonic neurons in optics-informed neural networks
S. Kovaios, C. Pappas, M. Moralis-Pegios, A. Tsakyridis, G. Giamougiannis, …, G. Coudyzer, X. Yin, N. Passalis, A. Tefas, N. Pleros
Journal of Lightwave Technology  ·  2024
A synthetic human-centric dataset generation pipeline for active robotic vision
C. Georgiadis, N. Passalis, N. Nikolaidis
Pattern Recognition Letters, 2024  ·  2024
Deep reinforcement learning for financial trading using multi-modal features
L. Avramelou, P. Nousi, N. Passalis, A. Tefas
Expert Systems with Applications  ·  2024
Predicting the immunomodulatory activity of probiotic lactic acid bacteria using supervised machine learning in a Cornu aspersum snail model
E. Charizani, E. Dushku, M. Kyritsi, E.T. Metallinou, A. Karathodorou, …, M.M. Kokkaleniou, N. Passalis, A. Tefas, A. Staikou, M. Yiangou
Fish & Shellfish Immunology  ·  2024
Online probabilistic knowledge distillation on cryptocurrency trading using Deep Reinforcement Learning
V. Moustakidis, N. Passalis, A. Tefas
Pattern Recognition Letters  ·  2024
VPIT: Real-time embedded single object 3D tracking using voxel pseudo images
I. Oleksiienko, P. Nousi, N. Passalis, A. Tefas, A. Iosifidis
Neural Computing and Applications  ·  2024
Semi-supervised learning for on-street parking violation prediction using graph convolutional networks
N. Karantaglis, N. Passalis, A. Tefas
Neural Computing and Applications  ·  2024

2023

CRYPTOSENTIMENT: A dataset and baseline for Sentiment-aware Deep Reinforcement Learning for Financial Trading
L. Avramelou, P. Nousi, N. Passalis, S. Doropoulos, A. Tefas
11th International Workshop on Computational Intelligence for Multimedia Understanding - IEEE ICASSP Satellite Workshop  ·  2023
Improving Inertial-based UAV Localization using Data-Efficient Deep Reinforcement Learning
D. Tsiakmakis, N. Passalis, A. Tefas
31th European Signal Processing Conference (EUSIPCO)  ·  2023
End-to-End Trainable Gaussian Filtering for Electrocardiogram Signal Classification using Deep Learning
A. Nalmpantis, N. Passalis, A. Tefas
31th European Signal Processing Conference (EUSIPCO)  ·  2023
Physics-inspired End-to-End Deep Learning for High-Performance Optical Fiber Transmission Links
I. Roumpos, L. De Marinis, G. Mourgias-Alexandris, M. Kirtas, N. Passalis, A. Tefas, G. Contestabile, K. Vyrsokinos, N. Pleros, M. Moralis-Pegios
CLEO: Science and Innovations  ·  2023
Deep Learning for Active Robotic Perception
N. Passalis, P. Tosidis, T. Manousis, A. Tefas
International Joint Conference on Computational Intelligence (IJCCI)  ·  2023
DDOS attack identification via a silicon photonic Deep Neural Network with 50 GHz input and weight update
A. Tsakyridis, G. Giamougiannis, M. Moralis-Pegios, G. Mourgias-Alexandris, A. R. Totovic, …, D. Kalavrouziotis, D. Syrivelis, P. Bakopoulos, E. Mentovich, N. Pleros
Optical Fiber Communication Conference  ·  2023
A Sharpe Ratio based reward scheme in Deep Reinforcement Learning for financial trading
G. Rodinos, P. Nousi, N. Passalis, A. Tefas
IFIP International Conference on Artificial Intelligence Applications and Innovations  ·  2023
Calibration of a Photonic Neural Network Considering Fabrication Tolerances
O. Düzgöl, M. Kirtas, N. Passalis, A. Richter
International Conference on Transparent Optical Networks (ICTON)  ·  2023
Deep Reinforcement Learning With Action Masking for Differential-Drive Robot Navigation Using Low-Cost Sensors
K. Tsampazis, M. Kirtas, P. Tosidis, N. Passalis, A. Tefas
IEEE International Workshop on Machine Learning for Signal Processing  ·  2023
Quantization-Aware Training for Mixed Precision Photonic Neural Networks
M. Kirtas, N. Passalis, A. Oikonomou, M. Moralis-Pegios, G. Giamougiannis, A. Tsakyridis, G. Mourgias-Alexandris, N. Pleros, A. Tefas
IEEE International Workshop on Machine Learning for Signal Processing  ·  2023
Leveraging Active and Continual Learning for Improving Deep Face Recognition in-the-Wild
P. Tosidis, N. Passalis, A. Tefas
2023 IEEE International Workshop on Multimedia Signal Processing (MMSP)  ·  2023
ActiveFace: A Synthetic Active Perception Dataset for Face Recognition
C. Georgiadis, N. Passalis, N. Nikolaidis
IEEE International Workshop on Multimedia Signal Processing (MMSP)  ·  2023
Enabling high-resolution pose estimation in real time using active perception
T. Manousis, N. Passalis, A. Tefas
IEEE International Conference on Image Processing (ICIP)  ·  2023
Variational Voxel Pseudo Image Tracking
I. Oleksiienko, P. Nousi, N. Passalis, A. Tefas, A. Iosifidis
IEEE Symposium Series on Computational Intelligence (SSCI)  ·  2023
Deep Active Perception for Object Detection using Navigation Proposals
S. Ginargiros, N. Passalis, A. Tefas
IEEE Symposium Series on Computational Intelligence (SSCI)  ·  2023
Deep Active Robotic Perception for Improving Face Recognition Under Occlusions
V. Dimaridou, N. Passalis, A. Tefas
IEEE Symposium Series on Computational Intelligence (SSCI)  ·  2023
Symmetric Fine-Tuning for Improving Few-Shot Object Detection
E. Mpampis, N. Passalis, A. Tefas
IEEE Symposium Series on Computational Intelligence (SSCI)  ·  2023
Domain-Specific Large Language Model Finetuning using a Model Assistant for Financial Text Summarization
L. Avramelou, N. Passalis, G. Tsoumakas, A. Tefas
IEEE Symposium Series on Computational Intelligence (SSCI)  ·  2023
Robust architecture-agnostic and noise resilient training of photonic deep learning models
M. Kirtas, N. Passalis, G. Mourgias-Alexandris, G. Dabos, N. Pleros, A. Tefas
IEEE Transactions on Emerging Topics in Computational Intelligence  ·  2023
Predicting on-street parking violation rate using deep residual neural networks
N. Karantaglis, N. Passalis, A. Tefas
Pattern Recognition Letters  ·  2023
Quantization-aware Training for Low Precision Photonic Neural Networks
M. Kirtas, A. Oikonomou, N. Passalis, G. Mourgias-Alexandris, M. Moralis-Pegios, N. Pleros, A. Tefas
Neural Networks  ·  2023
Neuromorphic silicon photonics with 50 GHz tiled matrix multiplication for deep-learning applications
G. Giamougiannis, A. Tsakyridis, M. Moralis-Pegios, G. Mourgias-Alexandris, A. R. Totovic, …, D. Syrivelis, P. Bakopoulos, E. Mentovich, D. Lazovsky, N. Pleros
Advanced Photonics  ·  2023
First machine learning gravitational-wave search mock data challenge
M. B. Schäfer, O. Zelenka, A. H. Nitz, H. Wang, S. Wu, …, B. Brügmann, E. Cuoco, E. A. Huerta, C. Messenger, F. Ohme
Physical Review D  ·  2023
Programmable Tanh-, ELU-, Sigmoid-, Sin-Based Nonlinear Activation Functions for Neuromorphic Photonics
C. Pappas, S. Kovaios, M. Moralis-Pegios, A. Tsakyridis, G. Giamougiannis, …, G. Coudyzer, X. Yin, N. Passalis, A. Tefas, N. Pleros
IEEE Journal of Selected Topics in Quantum Electronics  ·  2023
Mutual Information-Based Neural Network Distillation for Improving Photonic Neural Network Training
A. Chariton, N. Passalis, N. Pleros, A. Tefas
Neural Processing Letters  ·  2023
High-performance end-to-end deep learning IM/DD link using optics-informed neural networks
I. Roumpos, L.D. Marinis, M. Kirtas, N. Passalis, A. Tefas, G. Contestabile, N. Pleros, M. Moralis-Pegios, K. Vyrsokinos
Optics Express  ·  2023
Analog nanophotonic computing going practical: silicon photonic deep learning engines for tiled optical matrix multiplication with dynamic precision
G. Giamougiannis, A. Tsakyridis, M. Moralis-Pegios, C. Pappas, M. Kirtas, N. Passalis, D. Lazovsky, A. Tefas, Pleros
Nanophotonics  ·  2023
Deep residual networks for gravitational wave detection
P. Nousi, A.E. Koloniari, N. Passalis, P. Iosif, N. Stergioulas, A. Tefas
Physical Review D  ·  2023

2022

Neural Networks and Backpropagation
A. Zaras, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Deep learning for robotics examples using OpenDR
M. Kirtas, K. Tsampazis, P. Tosidis, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Representation Learning and Retrieval
M. Tzelepi, P. Nousi, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Lightweight Deep Learning
P. Nousi, M. Tzelepi, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Deep Reinforcement Learning
A. Tsantekidis, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Recurrent Neural Networks
A. Tsantekidis, N. Passalis, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Knowledge Distillation
N. Passalis, M. Tzelepi, A. Tefas
Deep Learning for Robot Perception and Cognition (A. Iosifidis, A. Tefas, eds.), Elsevier  ·  2022
Silicon Photonic Neuromorphic Computing with 16 GHz Input Data and Weight Update Line Rates
A. Tsakyridis, G. Giamougiannis, G. Mourgias-Alexandris, A. Totovic, G. Dabos, N. Passalis, M. Kirtas, A. Tefas, M. Moralis-Pegios, N. Pleros
Conference on Lasers and Electro-Optics (CLEO)  ·  2022
A robust, quantization-aware training method for photonic neural networks
A. Oikonomou, M. Kirtas, N. Passalis, G. Mourgias-Alexandris, M. Moralis-Pegios, N. Pleros, A. Tefas
Engineering Applications and Advances of Artificial Intelligence Conference (EANN)  ·  2022
Early Detection of DDoS Attacks using Photonic Neural Networks
M. Kirtas, N. Passalis, D. Kalavrouziotis, D. Syrivelis, P. Bakopoulos, N. Pleros, A. Tefas
IEEE Image, Video, Multidimensional Signal Processing Workshop (IVMSP)  ·  2022
Deep Learning for On-Street Parking Violation Prediction
N. Karantaglis, N. Passalis, A. Tefas
IEEE Image, Video, Multidimensional Signal Processing Workshop (IVMSP)  ·  2022
Electric load demand forecasting on Greek Energy Market using lightweight neural networks
N. Maragkos, M. Tzelepi, N. Passalis, A. Adamakos, A. Tefas
IEEE Image, Video, Multidimensional Signal Processing Workshop (IVMSP)  ·  2022
Sentiment-aware Distillation for Bitcoin Trend Forecasting Under Partial Observability
G. Panagiotatos, N. Passalis, A. Tsantekidis, A. Tefas
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)  ·  2022
Normalized Post-training Quantization for Photonic Neural Networks
M. Kirtas, N. Passalis, A. Oikonomou, G. Mourgias-Alexandris, M. Moralis-Pegios, N. Pleros, A. Tefas
IEEE Symposium Series On Computational Intelligence  ·  2022
A Novel Dataset for Evaluating and Alleviating Domain Shift for Human Detection in Agricultural Fields
P. Nousi, E. Mpampis, N. Passalis, O. Green, A. Tefas
IEEE Symposium Series On Computational Intelligence  ·  2022
Bag-Of-Features-Based Knowledge Distillation For Lightweight Convolutional Neural Networks
A. Chariton, N. Passalis, A. Tefas
IEEE International Conference on Image Processing (ICIP)  ·  2022
High-speed analog photonic computing with tiled matrix multiplication and dynamic precision capabilities for DNNs
G. Giamougiannis, A. Tsakyridis, M. Moralis-Pegios, C. Pappas, M. Kirtas, N. Passalis, A. Tefas, and N. Pleros
European Conference on Optical Communication (ECOC)  ·  2022
Photonic Neuromorphic Computing: Architectures, Technologies, Training Models
M. Moralis-Pegios, A. Totovic, A. Tsakyridis, G. Giamougiannis, G. Mourgias-Alexandris, G. Dabos, N. Passalis, M. Kirtas, A. Tefas, and N. Pleros
Optical Fiber Communications Conference and Exhibition  ·  2022
Deep Video Stream Information Analysis and Retrieval: Challenges and Opportunities
N. Passalis, M. Tzelepi, P. Charitidis, S. Doropoulos, S. Vologiannidis, A. Tefas
IEEE 5th International Conference on Multimedia Information Processing  ·  2022
Active Vision Control Policies for Face Recognition using Deep Reinforcement Learning
P. Tosidis, N. Passalis, A. Tefas
30th European Signal Processing Conference (EUSIPCO)  ·  2022
Learning photonic neural network initialization for noise-aware end-to-end fiber transmission
M. Kirtas, N. Passalis, G. Mourgias-Alexandris, G. Dabos, N. Pleros, A. Tefas
30th European Signal Processing Conference (EUSIPCO)  ·  2022
Online Knowledge Distillation for Financial Timeseries Forecasting
P. Floratos, A. Tsantekidis, N. Passalis, A. Tefas
International Conference on INnovations in Intelligent SysTems and Applications (INISTA)  ·  2022
Improving Noise Resilience in End-to-End Deep Learning Optical Fiber Transmission Links
L. De Marinis, I. Roumpos, G. Mourgias-Alexandris, M. Kirtas, N. Passalis, A. Tefas, G. Contestabile, K. Vyrsokinos, N. Pleros, M. Moralis-Pegios
Asia Communications and Photonics Conference (APC)  ·  2022
OpenDR: An Open Toolkit for Enabling High Performance, Low Footprint Deep Learning for Robotics
N. Passalis, S. Pedrazzi, R. Babuska, W. Burgard, D. Dias, …, P. Nousi, R. Pieters, M. Tzelepi, A. Valada, A. Tefas
IEEE/RSJ International Conference on Intelligent Robots (IROS)  ·  2022
Probabilistic Online Self-Distillation
M. Tzelepi, N. Passalis, A. Tefas
Neurocomputing  ·  2022
Channel response-aware photonic neural network accelerators for high-speed inference through bandwidth-limited optics
G. Mourgias-Alexandris, M. Moralis-Pegios, A. Tsakyridis, N. Passalis, M. Kirtas, A. Tefas, T. Rutirawut, F. Y. Gardes, N. Pleros
Optics Express  ·  2022
WDM Equipped Universal Linear Optics for Programmable Neuromorphic Photonic Processors
A. Totovic, C. Pappas, M. Kirtas, A. Tsakyridis, G. Giamougiannis, N. Passalis, M. Moralis-Pegios, A. Tefas, N. Pleros
Neuromorphic Computing and Engineering  ·  2022
Neuromorphic Silicon Photonics and Hardware-aware Deep Learning for High-Speed Inference
M. Moralis-Pegios, G. Mourgias-Alexandris, A. Tsakyridis, G. Giamougiannis, A. Totovic, …, M. Kirtas, T. Rutirawut, F. Y. Gardes, A. Tefas, N. Pleros
IEEE/OSA Journal of Lightwave Technology  ·  2022
Graph Embedding with Data Uncertainty
F. Laakom, N. Passalis, J. Raitoharju, J. Nikkanen, A. Tefas, A. Iosifidis, M. Gabbouj
IEEE Access  ·  2022
Attention-based Neural Bag-of-Features Learning for Sequence Data
D. Thanh Tran, N. Passalis, A. Tefas, M. Gabbouj, A. Iosifidis
IEEE Access  ·  2022
Autoencoder-driven spiral representation learning for gravitational wave surrogate modelling
P. Nousi, S.-C. Fragkouli, N. Passalis, P. Iosif, T. Apostolatos, G. Pappas, N. Stergioulas, A. Tefas
Neurocomputing  ·  2022
Universal Linear Optics for Ultra-Fast Neuromorphic Silicon Photonics Towards Fj/MAC and TMAC/sec/mm2 Engines
A. Tsakyridis, G. Giamougiannis, M. Moralis-Pegios, G. Mourgias-Alexandris, A. Totovic, M. Kirtas, N. Passalis, D. Lazovsky, A. Tefas, N. Pleros
IEEE Journal of Selected Topics in Quantum Electronics  ·  2022
Universal Linear Optics Revisited: New Perspectives for Neuromorphic Computing with Silicon Photonics
G. Giamougiannis, A. Tsakyridis, M. Moralis-Pegios, A. Totovic, M. Kirtas, N. Passalis, D. Lazovsky, A. Tefas, N. Pleros
IEEE Journal of Selected Topics in Quantum Electronics  ·  2022
Noise-resilient and high-speed deep learning with coherent silicon photonics
G. Mourgias-Alexandris, M. Moralis-Pegios, A. Tsakyridis, S. Simos, G. Dabos, …, M. Kirtas, T. Rutirawut, F.Y. Gardes, A. Tefas, N. Pleros
Nature Communications  ·  2022
Multisource Financial Sentiment Analysis for Detecting Bitcoin Price Change Indications using Deep Learning
N. Passalis, L. Avramelou, S. Seficha, A. Tsantekidis, S. Doropoulos, G. Makris, Anastasios Tefas
Neural Computing and Applications  ·  2022

2021

Silicon-integrated coherent neurons with 32GMAC/sec/axon compute line-rates using EAM-based input and weighting cells
G. Giamougiannis, A. Tsakyridis, G. Mourgias-Alexandris, M. Moralis Pegios, A. Totovic, …, M. Kirtas, N. Bamiedakis, A. Tefas, D. Lazovsky, N. Pleros
European Conference on Optical Communication (ECOC)  ·  2021
25GMAC/sec/axon photonic neural networks with 7GHz bandwidth optics through channel response-aware training
G. Mourgias-Alexandris, A. Tsakyridis, N. Passalis, M. Kirtas, A. Tefas, T. Rutirawut, F. Y. Gardes, N. Pleros, M. Moralis Pegios
European Conference on Optical Communication (ECOC)  ·  2021
Efficient Realistic Data Generation Framework leveraging Deep Learning-based Human Digitization
C. Symeonidis, P. Nousi, P. Tosidis, K. Tsampazis, N. Passalis, A. Tefas, N. Nikolaidis
International Conference on Engineering Applications of Neural Networks  ·  2021
Compute with Light: Architectures, Technologies and Training Models for Neuromorphic Photonic Circuits
N. Pleros, M. Moralis-Pegios, A. Totovic, G. Dabos, A. Tsakyridis, G. Giamougiannis, G. Mourgias-Alexandris, N. Passalis, M. Kirtas, A. Tefas
European Conference on Optical Communication (ECOC)  ·  2021
A Silicon Photonic Coherent Neuron with 10GMAC/sec processing line-rate
G. Mourgias-Alexandris, M. Moralis-Pegios, S. Simos, G. Dabos, N. Passalis, M. Kirtas, T. Rutirawut, F. Y. Gardes, A. Tefas, Nikos Pleros
Optical Fiber Communications Conference and Exhibition (OFC)  ·  2021
Silicon-integrated coherent neurons with 32GMAC/sec/axon compute line-rates using EAM-based input and weighting cells
G. Giamougiannis, A. Tsakyridis, G. Mourgias-Alexandris, M. Moralis-Pegios, A. Totovic, …, M. Kirtas, N. Bamiedakis, A. Tefas, D. Lazovsky, Nikos Pleros
European Conference on Optical Communication (ECOC)  ·  2021
End-to-end deep learning with neuromorphic photonics
G. Dabos, G. Mourgias-Alexandris, A. Totovic, M. Kirtas, N. Passalis, A. Tefas, N. Pleros
Integrated Optics: Devices, Materials, Technologies XXV  ·  2021
Temporal Difference Rewards for End-to-end Vision-based Active Robot Tracking using Deep Reinforcement Learning
P. Tiritiris, N. Passalis, A. Tefas
International Conference on Emerging Techniques in Computational Intelligence (ICETCI)  ·  2021
Learning Sentiment-aware Trading Strategies for Bitcoin leveraging Deep Learning-based Financial News Analysis
N. Passalis, S. Seficha, A. Tsantekidis, A. Tefas
International Conference on Artificial Intelligence Applications and Innovations (AIAI)  ·  2021
Adaptive Inference for Face Recognition leveraging Deep Metric Learning-enabled Early Exits
N. Passalis, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2021
Improving Deep Reinforcement Learning for Financial Trading using Deep Adaptive Group-based Normalization
A. Nalmpantis, N. Passalis, A. Tsantekidis, A. Tefas
IEEE International Workshop on Machine Learning for Signal Processing (MLSP)  ·  2021
Pseudo-Active Vision for Improving Deep Visual Perception through Neural Sensory Refinement
N. Passalis, A. Tefas
IEEE International Conference on Image Processing (ICIP)  ·  2021
Improving Knowledge Distillation using Unified Ensembles of Specialized Teachers
A. Zaras, N. Passalis, A. Tefas
Pattern Recognition Letters  ·  2021
deepsing: Generating sentiment-aware visual stories using cross-modal music translation
N. Passalis, S. Doropoulos
Expert Systems with Applications  ·  2021
Online Subclass Knowledge Distillation
M. Tzelepi, N. Passalis, A. Tefas
Expert Systems With Applications  ·  2021
Deep Adaptive Group-based Input Normalization for Financial Trading
A. Nalmpantis, N. Passalis, A. Tsantekidis, A. Tefas
Pattern Recognition Letters  ·  2021

2020

aColor: Mechatronics, Machine Learning, Communications in an Unmanned Surface Vehicle
…, N. Passalis, …
Transport Research Arena Conference (TRA2020)  ·  2020
Multilayer Probabilistic Knowledge Transfer for Learning Image Representations
N. Passalis, M. Tzelepi, A. Tefas
IEEE International Symposium on Circuits & Systems (ISCAS)  ·  2020
Adaptive Initialization for Recurrent Photonic Networks using Sigmoidal Activations
N. Passalis, G. Mourgias-Alexandris, N. Pleros, A. Tefas
IEEE International Symposium on Circuits & Systems (ISCAS)  ·  2020
All-optical recurrent neural network with sigmoid activation function
G. Mourgias-Alexandris, G. Dabos, N. Passalis, A. Tefas, A. Totovic, N. Pleros
Optical Fiber Communication Conference (OFC)  ·  2020
A Webots-based Deep Reinforcement Learning Framework for Robotics
M. Kirtas, K. Tsampazis, N. Passalis, Anastasios Tefas
International Conference on Artificial Intelligence Applications and Innovations  ·  2020
Adaptive Normalization for Forecasting Limit Order Book Data using Convolutional Neural Networks
N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE International Conference on Acoustics, Speech, Signal Processing (ICASSP)  ·  2020
Different Color Spaces in Deep Learning-based Water Segmentation for Autonomous Marine Operations
J. Taipalmaa, N. Passalis, J. Raitoharju
IEEE International Conference on Image Processing (ICIP)  ·  2020
Robust Hypersphere-based Weight Imprinting for Few-shot Learning
N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2020
Training Noise-resilient Recurrent Photonic Networks for Financial Time Series Analysis
N. Passalis, M. Kirtas, G. Mourgias-Alexandris, G. Dabos, N. Pleros, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2020
Improving Universal Style Transfer using Sub-style Decomposition
P. Pegios, N. Passalis, A. Tefas
Hellenic Conference on Artificial Intelligence (SETN)  ·  2020
Improving Visual Question Answering using Active Perception on Static Images
T. Bozinis, N. Passalis, A. Tefas
International Conference on Pattern Recognition (ICPR)  ·  2020
Improving Deep Reinforcement Learning for Financial Trading using Neural Network Distillation
A. Tsantekidis, N. Passalis, A. Tefas
IEEE International Workshop on Machine Learning for Signal Processing  ·  2020
Leveraging Deep Reinforcement Learning for Active Shooting under Open-World Setting
A. Tzimas, N. Passalis, Anastasios Tefas
IEEE International Conference on Multimedia and Expo  ·  2020
Heterogeneous Knowledge Distillation using Information Flow Modeling
N. Passalis, M. Tzelepi, Anastasios Tefas
IEEE Conference on Computer Vision and Pattern Recognition  ·  2020
Efficient Adaptive Inference leveraging Bag-of-Features-based Early Exits
N. Passalis, J. Raitoharju, M. Gabbouj, A. Tefas
IEEE International Workshop on Multimedia Signal Processing  ·  2020
Global Adaptive Input Normalization for Short-Term Electric Load Forecasting
N. Passalis, A. Tefas
IEEE Symposium Series on Computational Intelligence  ·  2020
Human Action Recognition using Recurrent Bag-of-Features Pooling
M. Krestenitis, N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
ICPR Workshop on Image Mining: Theory and Applications  ·  2020
Efficient Online Subclass Knowledge Distillation for Image Classification
M. Tzelepi, N. Passalis, A. Tefas
International Conference on Pattern Recognition (ICPR)  ·  2020
Leveraging Quadratic Spherical Mutual Information Hashing for Fast Image Retrieval
N. Passalis, A. Tefas
International Conference on Pattern Recognition (ICPR)  ·  2020
Using Deep Learning for price prediction by exploiting stationary limit order book features
A. Tsantekidis, N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
Applied Soft Computing  ·  2020
All-optical WDM Recurrent Neural Networks with Gating
G. Mourgias-Alexandris, G. Dabos, N. Passalis, A. Totovic, A. Tefas, N. Pleros
IEEE Journal of Selected Topics in Quantum Electronics  ·  2020
Femtojoule per MAC Neuromorphic Photonics: An Energy and Technology Roadmap
A. Totovic, G. Dabos, N. Passalis, A. Tefas, N. Pleros
IEEE Journal of Selected Topics in Quantum Electronics  ·  2020
Hypersphere-based Weight Imprinting for Few-shot Learning on Embedded Devices
N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
Transactions on Neural Networks and Learning Systems  ·  2020
Efficient Adaptive Inference for Deep Convolutional Neural Networks using Hierarchical Early Exits
N. Passalis, J. Raitoharju, A. Tefas, M. Gabbouj
Pattern Recognition  ·  2020
Recurrent Bag-of-Features for Visual Information Analysis
M. Krestenitis, N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
Pattern Recognition  ·  2020
Price Trailing for Financial Trading using Deep Reinforcement Learning
A. Tsantekidis, N. Passalis, A. Toufa, K. Saitas-Zarkias, A. Tefas
Transactions on Neural Networks and Learning Systems  ·  2020
Probabilistic Knowledge Transfer for Lightweight Deep Representation Learning
N. Passalis, M. Tzelepi, A. Tefas
Transactions on Neural Networks and Learning Systems  ·  2020
Initializing Photonic Feed-forward Neural Networks using Auxiliary Tasks
N. Passalis, G. Mourgias-Alexandris, N. Pleros, A. Tefas
Neural Networks  ·  2020
Temporal Logistic Neural Bag-of-Features for Financial Time series Forecasting leveraging Limit Order Book Data
N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
Pattern Recognition Letters  ·  2020
Bag of Color Features For Color Constancy
F. Laakom, N. Passalis, J. Raitoharju, J. Nikkanen, A. Tefas, A. Iosifidis, M. Gabbouj
IEEE Transactions on Image Processing  ·  2020
A Photonic Recurrent Neuron for Time-Series Classification
G. Mourgias-Alexandris, N. Passalis, G. Dabos, A. Totovic, A. Tefas, N. Pleros
IEEE/OSA Journal of Lightwave Technology  ·  2020
Forecasting Financial Time Series using Robust Deep Adaptive Input Normalization
N. Passalis, J. Kanniainen, M. Gabbouj, A. Iosifidis, A. Tefas
Journal of Signal Processing Systems  ·  2020
Multi-level Reversible Data Anonymization via Compressive Sensing and Data Hiding
M. Yamac, M. Ahishali, J. Raitharju, N. Passalis, M. Gabbouj, B. Sankur
IEEE Transactions on Information Forensics & Security  ·  2020

2019

Face Verification and Recognition for Digital Forensics and Information Security
G. Amato, F. Falchi, C. Gennaro, F. Massoli, N. Passalis, A. Tefas, A. Trivilini, C. Vairo
International Symposium on Digital Forensic and Security (ISDFS)  ·  2019
Experimental demonstration of an optical neuron with a logistic Sigmoid activation function
G. Mourgias-Alexandris, A. Tsakyridis, N. Passalis, A. Tefas, N. Pleros
Optical Fiber Communication Conference (OFC)  ·  2019
Variance Preserving Initialization for Training Deep Neuromorphic Photonic Networks with Sinusoidal Activations
N. Passalis, G. Mourgias-Alexandris, A. Tsakyridis, N. Pleros, A. Tefas
IEEE International Conference on Acoustics, Speech, Signal Processing (ICASSP)  ·  2019
Deep Reinforcement Learning for Financial Trading using Price Trailing
K. Saitas-Zarkias, N. Passalis, A. Tsantekidis, A. Tefas
IEEE International Conference on Acoustics, Speech, Signal Processing (ICASSP)  ·  2019
Deep Temporal Logistic Bag-of-Features for Forecasting High Frequency Limit Order Book Time Series
N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE International Conference on Acoustics, Speech, Signal Processing (ICASSP)  ·  2019
Class-based Variational Representation Learning for Robust Image Retrieval
N. Passalis, A. Tefas, A. Iosifidis, M. Gabbouj
IEEE International Conference on Image Processing (ICIP)  ·  2019
Adaptive Inference using Hierarchical Convolutional Bag-of-Features for Low-power Embedded Platforms
N. Passalis, J. Raitoharju, A. Tefas, M. Gabbouj
IEEE International Conference on Image Processing (ICIP)  ·  2019
Curriculum-based Teacher Ensemble for Robust Neural Network Distillation
G. Panagiotatos, N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
European Signal Processing Conference (EUSIPCO)  ·  2019
Less is More: Deep Learnig using Subjective Annotations for Sentiment Analysis from Social Media
C. Tzogka, N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
IEEE International Workshop on Machine Learning for Signal Processing (MLSP)  ·  2019
Reversible Privacy Preservation Using Multi-level Encryption and Compressive Sensing
M. Yamac, M. Ahishali, N. Passalis, J. Raitharju, M. Gabbouj, B. Sankur
European Signal Processing Conference (EUSIPCO)  ·  2019
High-Resolution Water Segmentation for Autonomous Unmanned Surface Vehicles: A novel dataset and evaluation
J. Taipalmaa, N. Passalis, H. Zhang, M. Gabbouj, J. Raitoharju
IEEE International Workshop on Machine Learning for Signal Processing (MLSP)  ·  2019
An all-optical neuron with sigmoid activation function
G. Mourgias-Alexandris, A. Tsakyridis, N. Passalis, A. Tefas, K. Vyrsokinos, and N. Pleros
Optics Express  ·  2019
Machine learning for forecasting mid price movement using limit order book data
P. Nousi, A. Tsantekidis, N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE Access  ·  2019
Training Deep Photonic Convolutional Neural Networks with Sinusoidal Activations
N. Passalis, G. Mourgias-Alexandris, A. Tsakyridis, N. Pleros, A. Tefas
IEEE Transactions on Emerging Topics in Computational Intelligence  ·  2019
Discriminative clustering using regularized subspace learning
N. Passalis, A. Tefas
Pattern Recognition  ·  2019
Visual representation decoding from human brain activity using machine learning: A baseline study
A. Papadimitriou, N. Passalis, A. Tefas
Pattern Recognition Letters  ·  2019
Neuromorphic Photonics with Coherent Linear Neurons using dual-IQ modulation cells
G. Mourgias-Alexandris, A. Totovic, A. Tsakyridis, N. Passalis, A. Tefas K. Vyrsokinos, N. Pleros
Journal of Lightwave Technology  ·  2019
Variance-preserving deep metric learning for content-based image retrieval
N. Passalis, A. Iosifidis, M. Gabbouj, A. Tefas
Pattern Recognition Letters  ·  2019
Deep Adaptive Input Normalization for Time Series Forecasting
N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE Transactions on Neural Networks and Learning Systems  ·  2019

2018

Deep Learning Analytics
N. Passalis, A. Tefas
Machine Learning Paradigms: Advances in Data Analytics (G. Tsihrintzis, D. Sotiropoulos, L. Jain, eds.), Springer  ·  2018
Decoding generic visual representations from human brain activity using machine learning
A. Papadimitriou, N. Passalis, A. Tefas
European Conference on Computer Vision Workshops - Workshop on Brain Driven Computer Vision - (ECCVW)  ·  2018
Fast, visual and interactive semi-supervised dimensionality reduction
D. Spathis, N. Passalis, A. Tefas
European Conference on Computer Vision Workshops - International Workshop on Compact and Efficient Feature Representation and Learning in Computer Vision - (ECCVW)  ·  2018
Deep reinforcement learning for frontal view person shooting using drones
N. Passalis, A. Tefas
IEEE Conference on Evolving and Adaptive Intelligent Systems (EAIS)  ·  2018
Learning discriminative representations for big data clustering using similarity-based dimensionality reduction
N. Passalis, A. Tefas
IEEE Image, Video, Multidimensional Signal Processing (IVMSP) Workshop  ·  2018
Accelerating Similarity-based discriminant analysis using class-specific prototypes
N. Passalis, A. Tefas
International Conference on Image Processing (ICIP)  ·  2018
Visual Question Answering Using Explicit Visual Attention
V. Lioutas, N. Passalis, A. Tefas
International Symposium on Circuits and Systems (ISCAS)  ·  2018
Efficient camera control using 2d visual information for unmanned aerial vehicle-based cinematography
N. Passalis, A. Tefas, I. Pitas
International Symposium on Circuits and Systems (ISCAS)  ·  2018
Neural Network Knowledge Transfer using Unsupervised Similarity Matching
N. Passalis, A. Tefas
International Conference on Pattern Recognition (ICPR)  ·  2018
Probabilistic knowledge transfer for deep representation learning
N. Passalis, A. Tefas
European Conference on Computer Vision (ECCV)  ·  2018
Explicit ensemble attention learning for improving visual question answering
V. Lioutas, N. Passalis, A. Tefas
Pattern Recognition Letters  ·  2018
PySEF: A python library for similarity-based dimensionality reduction
N. Passalis, A. Tefas
Knowledge-Based Systems  ·  2018
Long Term Temporal Averaging for Stochastic Optimization of Deep Neural Networks
N. Passalis, A. Tefas
Neural Computing and Applications  ·  2018
Interactive dimensionality reduction using similarity projections
D. Spathis, N. Passalis, A. Tefas
Knowledge-Based Systems  ·  2018
Temporal bag-of-features learning for predicting mid price movements using high frequency limit order book data
N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE Transactions on Emerging Topics in Computational Intelligence  ·  2018
Training lightweight deep convolutional neural networks using bag-of-features pooling
N. Passalis, A. Tefas
IEEE Transactions on Neural Networks and Learning Systems  ·  2018
Unsupervised knowledge transfer using similarity embeddings
N. Passalis, A. Tefas
IEEE Transactions on Neural Networks and Learning Systems  ·  2018

2017

Forecasting stock prices from the limit order book using convolutional neural networks
A. Tsantekidis, N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
IEEE Conference on Business Informatics (CBI)  ·  2017
Using deep learning to detect price change indications in financial markets
A. Tsantekidis, N. Passalis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
European Signal Processing Conference (EUSIPCO)  ·  2017
Improving Face Pose Estimation Using Long-Term Temporal Averaging for Stochastic Optimization
N. Passalis, A. Tefas
International Conference on Engineering Applications of Neural Networks (EANN)  ·  2017
Time-series Classification Using Neural Bag-of-Features
N. Passalis, A. Tsantekidis, A. Tefas, J. Kanniainen, M. Gabbouj, A. Iosifidis
European Signal Processing Conference (EUSIPCO)  ·  2017
Learning Bag-of-Features Pooling for Deep Convolutional Neural Networks
N. Passalis, A. Tefas
International Conference on Computer Vision (ICCV)  ·  2017
Learning Neural Bag-of-Features for Large Scale Information Retrieval
N. Passalis, A. Tefas
IEEE Transactions on Systems, Man, Cybernetics: Systems  ·  2017
Neural Bag-of-Features Learning
N. Passalis, A. Tefas
Pattern Recognition  ·  2017
Dimensionality Reduction using Similarity-induced Embeddings
N. Passalis, A. Tefas
IEEE Transactions on Neural Networks and Learning Systems  ·  2017

2016

Bag of Embedded Words Learning for Text Retrieval
N. Passalis, A. Tefas
International Conference on Pattern Recognition (ICPR)  ·  2016
Spectral Clustering using Optimized Bag-of-Features
N. Passalis, A. Tefas
Hellenic Conference on Artificial Intelligence (SETN)  ·  2016
Entropy Optimized Feature-Based Bag-of-Words Representation for Information Retrieval
N. Passalis, A. Tefas
IEEE Transactions on Knowledge and Data Engineering  ·  2016

2015

Multispot: Spotting sentiments with semantic aware multilevel cascaded analysis
D. Chatzakou, N. Passalis, A. Vakali
International Conference on Big Data Analytics and Knowledge Discovery  ·  2015