publications

journal and conference publications

I have published more than 140 papers in international conferences (CVPR, ICCV, ECCV, ICPR, ISCAS, ...) and international journals (TNNLS, TKDE, PR, ...). You can find a list of my publications, along with links to the paper/publisher site and code (when available) below. If you find any broken link or missing paper, please let me know and I will be happy to share our work with you.

Journals

2023

  1. First machine learning gravitational-wave search mock data challenge
    Marlin B Schäfer, Ondřej Zelenka, Alexander H Nitz, He Wang, Shichao Wu, Zong-Kuan Guo, Zhoujian Cao, Zhixiang Ren, Paraskevi Nousi, Nikolaos Stergioulas, Panagiotis Iosif, Alexandra E. Koloniari, Anastasios TefasNikolaos Passalis, Francesco Salemi, Gabriele Vedovato, Sergey Klimenko, Tanmaya Mishra, Bernd Brügmann, Elena Cuoco, E. A. Huerta, Chris Messenger, and Frank Ohme
    Physical Review D, 2023
  2. Mutual Information-Based Neural Network Distillation for Improving Photonic Neural Network Training
    Alexandros Chariton, Nikolaos Passalis, Nikos Pleros, and Anastasios Tefas
    Neural Processing Letters, 2023
  3. Neuromorphic silicon photonics with 50 GHz tiled matrix multiplication for deep-learning applications
    George Giamougiannis, Apostolos Tsakyridis, Miltiadis Moralis-Pegios, George Mourgias-Alexandris, Angelina R Totovic, George Dabos, Manos Kirtas, Nikolaos PassalisAnastasios Tefas, Dimitrios Kalavrouziotis, and  others
    Advanced Photonics, 2023
  4. Analog nanophotonic computing going practical: silicon photonic deep learning engines for tiled optical matrix multiplication with dynamic precision
    George Giamougiannis, Apostolos Tsakyridis, Miltiadis Moralis-Pegios, Christos Pappas, Manos Kirtas, Nikolaos Passalis, David Lazovsky, Anastasios Tefas, and Nikos Pleros
    Nanophotonics, 2023

2022

  1. Attention-based neural bag-of-features learning for sequence data
    Dat Thanh Tran, Nikolaos PassalisAnastasios TefasMoncef Gabbouj, and Alexandros Iosifidis
    IEEE Access, 2022
  2. Graph embedding with data uncertainty
    Firas Laakom, Jenni Raitoharju, Nikolaos PassalisAlexandros Iosifidis, and Moncef Gabbouj
    IEEE Access, 2022
  3. Autoencoder-driven spiral representation learning for gravitational wave surrogate modelling
    Paraskevi Nousi, Styliani-Christina Fragkouli, Nikolaos Passalis, Panagiotis Iosif, Theocharis Apostolatos, George Pappas, Nikolaos Stergioulas, and Anastasios Tefas
    Neurocomputing, 2022
  4. Probabilistic online self-distillation
    Maria Tzelepi, Nikolaos Passalis, and Anastasios Tefas
    Neurocomputing, 2022
  5. 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, FY Gardes, and N Pleros
    Optics Express, 2022
  6. Neuromorphic silicon photonics and hardware-aware deep learning for high-speed inference
    Miltiadis Moralis-Pegios, George Mourgias-Alexandris, Apostolos Tsakyridis, George Giamougiannis, Angelina Totovic, George Dabos, Nikolaos Passalis, Manos Kirtas, T Rutirawut, FY Gardes, and  others
    Journal of Lightwave Technology, 2022
  7. WDM equipped universal linear optics for programmable neuromorphic photonic processors
    Angelina Totovic, Christos Pappas, Manos Kirtas, Apostolos Tsakyridis, George Giamougiannis, Nikolaos Passalis, Miltiadis Moralis-Pegios, Anastasios Tefas, and Nikos Pleros
    Neuromorphic Computing and Engineering, 2022
  8. Multisource financial sentiment analysis for detecting Bitcoin price change indications using deep learning
    Nikolaos Passalis, Loukia Avramelou, Solon Seficha, Avraam Tsantekidis, Stavros Doropoulos, Giorgos Makris, and Anastasios Tefas
    Neural Computing and Applications, 2022
  9. Robust architecture-agnostic and noise resilient training of photonic deep learning models
    Manos Kirtas, Nikolaos Passalis, George Mourgias-Alexandris, George Dabos, Nikos Pleros, and Anastasios Tefas
    IEEE Transactions on Emerging Topics in Computational Intelligence, 2022
  10. Quantization-aware training for low precision photonic neural networks
    M Kirtas, A Oikonomou, N Passalis, G Mourgias-Alexandris, M Moralis-Pegios, N Pleros, and A Tefas
    Neural Networks, 2022
  11. Noise-resilient and high-speed deep learning with coherent silicon photonics
    G Mourgias-Alexandris, M Moralis-Pegios, A Tsakyridis, S Simos, G Dabos, A Totovic, N Passalis, M Kirtas, T Rutirawut, FY Gardes, and  others
    Nature Communications, 2022
  12. Predicting on-street parking violation rate using deep residual neural networks
    Nikolaos Karantaglis, Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition Letters, 2022
  13. Universal Linear Optics Revisited: New Perspectives for Neuromorphic Computing with Silicon Photonics
    George Giamougiannis, Apostolos Tsakyridis, Miltiadis Moralis-Pegios, Angelina R Totovic, Manos Kirtas, Nikolaos PassalisAnastasios Tefas, David Lazovsky, and Nikos Pleros
    IEEE Journal of Selected Topics in Quantum Electronics, 2022
  14. Universal Linear Optics for Ultra-Fast Neuromorphic Silicon Photonics Towards Fj/MAC and TMAC/sec/mm 2 Engines
    Apostolos Tsakyridis, George Giamougiannis, Miltiadis Moralis-Pegios, George Mourgias-Alexandris, Angelina R Totovic, Manos Kirtas, Nikolaos Passalis, David Lazovsky, Anastasios Tefas, and Nikos Pleros
    IEEE Journal of Selected Topics in Quantum Electronics, 2022

2021

  1. deepsing: Generating sentiment-aware visual stories using cross-modal music translation
    Nikolaos Passalis, and Stavros Doropoulos
    Expert Systems with Applications, 2021
  2. Deep supervised hashing using quadratic spherical mutual information for efficient image retrieval
    Nikolaos Passalis, and Anastasios Tefas
    Signal Processing: Image Communication, 2021
  3. Forecasting Financial Time Series Using Robust Deep Adaptive Input Normalization
    Journal of Signal Processing Systems, 2021
  4. Diversity-driven knowledge distillation for financial trading using Deep Reinforcement Learning
    Avraam Tsantekidis, Nikolaos Passalis, and Anastasios Tefas
    Neural Networks, 2021
  5. A photonic recurrent neuron for time-series classification
    George Mourgias-Alexandris, Nikolaos Passalis, George Dabos, Angelina Totović, Anastasios Tefas, and Nikos Pleros
    Journal of Lightwave Technology, 2021
  6. Deep adaptive group-based input normalization for financial trading
    Angelos Nalmpantis, Nikolaos Passalis, Avraam Tsantekidis, and Anastasios Tefas
    Pattern Recognition Letters, 2021
  7. A silicon photonic coherent neuron with 10GMAC/sec processing line-rate
    Stelios Simos, George Dabos, Nikos Passalis, Teerapat Rutirawut, Frederic Gardes, Anastasios Tefas, and  others
    2021
  8. Improving knowledge distillation using unified ensembles of specialized teachers
    Adamantios Zaras, Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition Letters, 2021
  9. Online Subclass Knowledge Distillation
    Maria Tzelepi, Nikolaos Passalis, and Anastasios Tefas
    Expert Systems with Applications, 2021

2020

  1. Using deep learning for price prediction by exploiting stationary limit order book features
    Avraam Tsantekidis, Nikolaos PassalisAnastasios TefasJuho KanniainenMoncef Gabbouj, and Alexandros Iosifidis
    Applied Soft Computing, 2020
  2. Temporal logistic neural bag-of-features for financial time series forecasting leveraging limit order book data
    Pattern Recognition Letters, 2020
  3. Bag of color features for color constancy
    Firas Laakom, Nikolaos Passalis, Jenni Raitoharju, Jarno Nikkanen, Anastasios TefasAlexandros Iosifidis, and Moncef Gabbouj
    IEEE Transactions on Image Processing, 2020
  4. Variance-preserving deep metric learning for content-based image retrieval
    Pattern Recognition Letters, 2020
  5. Femtojoule per MAC neuromorphic photonics: an energy and technology roadmap
    Angelina R Totović, George Dabos, Nikolaos PassalisAnastasios Tefas, and Nikos Pleros
    IEEE Journal of Selected Topics in Quantum Electronics, 2020
  6. Hypersphere-based weight imprinting for few-shot learning on embedded devices
    IEEE Transactions on Neural Networks and Learning Systems, 2020
  7. Recurrent bag-of-features for visual information analysis
    Marios Krestenitis, Nikolaos PassalisAlexandros IosifidisMoncef Gabbouj, and Anastasios Tefas
    Pattern Recognition, 2020
  8. Efficient adaptive inference for deep convolutional neural networks using hierarchical early exits
    Nikolaos Passalis, Jenni Raitoharju, Anastasios Tefas, and Moncef Gabbouj
    Pattern Recognition, 2020
  9. All-optical WDM recurrent neural networks with gating
    George Mourgias-Alexandris, George Dabos, Nikolaos Passalis, Angelina Totović, Anastasios Tefas, and Nikos Pleros
    IEEE Journal of Selected Topics in Quantum Electronics, 2020
  10. Initializing photonic feed-forward neural networks using auxiliary tasks
    Nikolaos Passalis, George Mourgias-Alexandris, Nikos Pleros, and Anastasios Tefas
    Neural Networks, 2020
  11. Probabilistic knowledge transfer for lightweight deep representation learning
    Nikolaos Passalis, Maria Tzelepi, and Anastasios Tefas
    IEEE Transactions on Neural Networks and Learning Systems, 2020
  12. Price trailing for financial trading using deep reinforcement learning
    Avraam Tsantekidis, Nikolaos Passalis, Anastasia-Sotiria Toufa, Konstantinos Saitas-Zarkias, Stergios Chairistanidis, and Anastasios Tefas
    IEEE Transactions on Neural Networks and Learning Systems, 2020
  13. Multi-Level Reversible Data Anonymization via Compressive Sensing and Data Hiding
    Mehmet Yamac, Mete Ahishali, Nikolaos Passalis, Jenni Raitoharju, Bülent Sankur, and Moncef Gabbouj
    IEEE Transactions on Information Forensics and Security, 2020
  14. A Photonic Recurrent Neuron for Time-Series Classification
    George Mourgias-Alexandris, Nikolaos Passalis, George Dabos, Angelina Totović, Anastasios Tefas, and Nikos Pleros
    Journal of Lightwave Technology, 2020

2019

  1. Long-term temporal averaging for stochastic optimization of deep neural networks
    Nikolaos Passalis, and Anastasios Tefas
    Neural Computing and Applications, 2019
  2. Machine learning for forecasting mid-price movements using limit order book data
    Paraskevi Nousi, Avraam Tsantekidis, Nikolaos Passalis, Adamantios Ntakaris, Juho KanniainenAnastasios TefasMoncef Gabbouj, and Alexandros Iosifidis
    IEEE Access, 2019
  3. Interactive dimensionality reduction using similarity projections
    Dimitris Spathis, Nikolaos Passalis, and Anastasios Tefas
    Knowledge-Based Systems, 2019
  4. Deep reinforcement learning for controlling frontal person close-up shooting
    Nikolaos Passalis, and Anastasios Tefas
    Neurocomputing, 2019
  5. An all-optical neuron with sigmoid activation function
    George Mourgias-Alexandris, A Tsakyridis, N Passalis, Anastasios Tefas, K Vyrsokinos, and Nikolaos Pleros
    Optics express, 2019
  6. Training deep photonic convolutional neural networks with sinusoidal activations
    Nikolaos Passalis, George Mourgias-Alexandris, Apostolos Tsakyridis, Nikos Pleros, and Anastasios Tefas
    IEEE Transactions on Emerging Topics in Computational Intelligence, 2019
  7. Continuous drone control using deep reinforcement learning for frontal view person shooting
    Nikolaos Passalis, and Anastasios Tefas
    Neural Computing and Applications, 2019
  8. Discriminative clustering using regularized subspace learning
    Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition, 2019
  9. Visual representation decoding from human brain activity using machine learning: A baseline study
    Angeliki Papadimitriou, Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition Letters, 2019
  10. Neuromorphic photonics with coherent linear neurons using dual-IQ modulation cells
    George Mourgias-Alexandris, Angelina Totović, Apostolos Tsakyridis, Nikolaos Passalis, Konstantinos Vyrsokinos, Anastasios Tefas, and Nikos Pleros
    Journal of Lightwave Technology, 2019
  11. Deep adaptive input normalization for time series forecasting
    IEEE Transactions on Neural Networks and Learning Systems, 2019

2018

  1. Learning bag-of-embedded-words representations for textual information retrieval
    Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition, 2018
  2. Explicit ensemble attention learning for improving visual question answering
    Vasileios Lioutas, Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition Letters, 2018
  3. PySEF: A python library for similarity-based dimensionality reduction
    Nikolaos Passalis, and Anastasios Tefas
    Knowledge-Based Systems, 2018
  4. Unsupervised knowledge transfer using similarity embeddings
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Neural Networks and Learning Systems, 2018
  5. Temporal bag-of-features learning for predicting mid price movements using high frequency limit order book data
    IEEE Transactions on Emerging Topics in Computational Intelligence, 2018
  6. Training lightweight deep convolutional neural networks using bag-of-features pooling
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Neural Networks and Learning Systems, 2018

2017

  1. Neural bag-of-features learning
    Nikolaos Passalis, and Anastasios Tefas
    Pattern Recognition, 2017
  2. Learning neural bag-of-features for large-scale image retrieval
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Systems, Man, and Cybernetics: Systems, 2017
  3. Dimensionality reduction using similarity-induced embeddings
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Neural Networks and Learning Systems, 2017

2016

  1. Entropy optimized feature-based bag-of-words representation for information retrieval
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Knowledge and Data Engineering, 2016
  2. Information clustering using manifold-based optimization of the bag-of-features representation
    Nikolaos Passalis, and Anastasios Tefas
    IEEE Transactions on Cybernetics, 2016

Conferences

2022

  1. OpenDR: An open toolkit for enabling high performance, low footprint deep learning for robotics
    Nikolaos Passalis, S Pedrazzi, Robert Babuska, Wolfram Burgard, D Dias, F Ferro, Moncef Gabbouj, O Green, Alexandros Iosifidis, E Kayacan, and  others
    In IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2022
  2. Photonic neuromorphic computing: Architectures, technologies, and training models
    Miltiadis Moralis-Pegios, Angelina Totovic, Apostolos Tsakyridis, George Giamougiannis, George Mourgias-Alexandris, George Dabos, Nikolaos Passalis, Manos Kirtas, Anastasios Tefas, and Nikos Pleros
    In Optical Fiber Communications Conference and Exhibition (OFC), 2022
  3. Silicon photonic neuromorphic computing with 16 GHz input data and weight update line rates
    Apostolos Tsakyridis, George Giamougiannis, George Mourgias-Alexandris, Angelina Totovic, George Dabos, Nikolaos Passalis, Manos Kirtas, Anastasios Tefas, Miltiadis Moralis-Pegios, and Nikos Pleros
    In Conference on Lasers and Electro-Optics (CLEO), 2022
  4. Sentiment-Aware Distillation for Bitcoin Trend Forecasting Under Partial Observability
    Georgios Panagiotatos, Nikolaos Passalis, Avraam Tsantekidis, and Anastasios Tefas
    In IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2022
  5. A robust, quantization-aware training method for photonic neural networks
    A Oikonomou, M Kirtas, N Passalis, G Mourgias-Alexandris, M Moralis-Pegios, N Pleros, and A Tefas
    In 23rd International Conference Engineering Applications of Neural Networks (EAAAI/EANN), 2022
  6. Electric load demand forecasting on greek energy market using lightweight neural networks
    Nikitas Maragkos, Maria Tzelepi, Nikolaos Passalis, Apostolos Adamakos, and Anastasios Tefas
    In IEEE 14th Image, Video, and Multidimensional Signal Processing Workshop (IVMSP), 2022
  7. Deep Learning for On-Street Parking Violation Prediction
    Nikolaos Karantaglis, Nikolaos Passalis, and Anastasios Tefas
    In IEEE 14th Image, Video, and Multidimensional Signal Processing Workshop (IVMSP), 2022
  8. Early detection of ddos attacks using photonic neural networks
    M Kirtas, N Passalis, D Kalavrouziotis, D Syrivelis, P Bakopoulos, N Pleros, and A Tefas
    In IEEE 14th Image, Video, and Multidimensional Signal Processing Workshop (IVMSP), 2022
  9. Active Vision Control Policies for Face Recognition using Deep Reinforcement Learning
    Pavlos Tosidis, Nikolaos Passalis, and Anastasios Tefas
    In 30th European Signal Processing Conference (EUSIPCO), 2022
  10. Learning photonic neural network initialization for noise-aware end-to-end fiber transmission
    M Kirtas, N Passalis, G Mourgias-Alexandris, G Dabos, N Pleros, and A Tefas
    In 30th European Signal Processing Conference (EUSIPCO), 2022
  11. Deep Video Stream Information Analysis and Retrieval: Challenges and Opportunities
    N Passalis, M Tzelepi, P Charitidis, S Doropoulos, S Vologiannidis, and A Tefas
    In IEEE 5th International Conference on Multimedia Information Processing and Retrieval (MIPR), 2022
  12. Online Knowledge Distillation for Financial Timeseries Forecasting
    Pavlos Floratos, Avraam Tsantekidis, Nikolaos Passalis, and Anastasios Tefas
    In International Conference on INnovations in Intelligent SysTems and Applications (INISTA), 2022
  13. Bag-Of-Features-Based Knowledge Distillation For Lightweight Convolutional Neural Networks
    Alexandros Chariton, Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Conference on Image Processing (ICIP), 2022
  14. High-speed analog photonic computing with tiled matrix multiplication and dynamic precision capabilities for DNNs
    George Giamougiannis, Apostolos Tsakyridis, Miltiadis Moralis-Pegios, Christos Pappas, Manos Kirtas, Nikolaos Passalis, David Lazovsky, Anastasios Tefas, and Nikos Pleros
    In European Conference on Optical Communication (ECOC), 2022
  15. Photonic Neuromorphic Computing
    Miltiadis Moralis-Pegios, Manos Kirtas, George Giamougiannis, Nikolaos Passalis, Angelina Totovic, George Mourgias-Alexandris, Apostolos Tsakyridis, Nikolaos Pleros, and Anastasios Tefas
    In Optical Fiber Communications Conference and Exhibition (OFC), 2022
  16. Normalized Post-training Quantization for Photonic Neural Networks
    M Kirtas, N Passalis, A Oikonomou, G Mourgias-Alexandris, M Moralis-Pegios, N Pleros, and A Tefas
    In IEEE Symposium Series on Computational Intelligence (SSCI), 2022
  17. Improving Noise Resilience in End-to-End Deep Learning Optical Fiber Transmission Links
    Lorenzo De Marinis, Ioannis Roumpos, George Mourgias-Alexandris, Manos Kirtas, Nikolaos PassalisAnastasios Tefas, Giampiero Contestabile, Konstantinos Vyrsokinos, Nikos Pleros, and Miltiadis Moralis-Pegios
    In Asia Communications and Photonics Conference (ACP), 2022

2021

  1. Robust Hypersphere-based Weight Imprinting for Few-Shot Learning
    In European Signal Processing Conference (EUSIPCO), 2021
  2. Training Noise-Resilient Recurrent Photonic Networks for Financial Time Series Analysis
    Nikolaos Passalis, M Kirtas, George Mourgias-Alexandris, George Dabos, Nikos Pleros, and Anastasios Tefas
    In European Signal Processing Conference (EUSIPCO), 2021
  3. Leveraging Quadratic Spherical Mutual Information Hashing for Fast Image Retrieval
    Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Pattern Recognition (ICPR), 2021
  4. Improving Visual Question Answering using Active Perception on Static Images
    Theodoros Bozinis, Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Pattern Recognition (ICPR), 2021
  5. End-to-end deep learning with neuromorphic photonics
    G Dabos, G Mourgias-Alexandris, A Totovic, M Kirtas, N Passalis, A Tefas, and N Pleros
    In Integrated Optics: Devices, Materials, and Technologies XXV, 2021
  6. Efficient Online Subclass Knowledge Distillation for Image Classification
    Maria Tzelepi, Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Pattern Recognition (ICPR), 2021
  7. Human Action Recognition using Recurrent Bag-of-Features Pooling
    Marios Krestenitis, Nikolaos PassalisAlexandros IosifidisMoncef Gabbouj, and Anastasios Tefas
    In Workshop Image Mining Theory and Applications (IMTA VII)-, 2021
  8. Efficient Realistic Data Generation Framework Leveraging Deep Learning-Based Human Digitization
    C Symeonidis, P Nousi, P Tosidis, K Tsampazis, N Passalis, A Tefas, and N Nikolaidis
    In International Conference on Engineering Applications of Neural Networks, 2021
  9. Learning Sentiment-Aware Trading Strategies for Bitcoin Leveraging Deep Learning-Based Financial News Analysis
    N Passalis, S Seficha, A Tsantekidis, and A Tefas
    In IFIP International Conference on Artificial Intelligence Applications and Innovations, 2021
  10. Temporal Difference Rewards for End-to-end Vision-based Active Robot Tracking using Deep Reinforcement Learning
    Pavlos Tiritiris, Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Emerging Techniques in Computational Intelligence (ICETCI), 2021
  11. Leveraging quadratic spherical mutual information hashing for fast image retrieval
    Nikolaos Passalis, and Anastasios Tefas
    In 25th International Conference on Pattern Recognition (ICPR), 2021
  12. Pseudo-Active Vision For Improving Deep Visual Perception Through Neural Sensory Refinement
    Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Conference on Image Processing (ICIP), 2021
  13. 25GMAC/sec/axon photonic neural networks with 7GHz bandwidth optics through channel response-aware training
    George Mourgias-Alexandris, Apostolos Tsakyridis, Nikolaos Passalis, Manos Kirtas, Anastasios Tefas, Teerapat Rutirawut, Frederic Y Gardes, Nikos Pleros, and Miltiadis Moralis-Pegios
    In European Conference on Optical Communication (ECOC), 2021
  14. Adaptive Inference for Face Recognition leveraging Deep Metric Learning-enabled Early Exits
    Nikolaos Passalis, and Anastasios Tefas
    In 29th European Signal Processing Conference (EUSIPCO), 2021
  15. Improving Deep Reinforcement Learning for Financial Trading Using Deep Adaptive Group-Based Normalization
    Angelos Nalmpantis, Nikolaos Passalis, Avraam Tsantekidis, and Anastasios Tefas
    In IEEE 31st International Workshop on Machine Learning for Signal Processing (MLSP), 2021
  16. Silicon-integrated coherent neurons with 32GMAC/sec/axon compute line-rates using EAM-based input and weighting cells
    George Giamougiannis, Apostolos Tsakyridis, George Mourgias-Alexandris, Miltiadis Moralis-Pegios, Angelina Totovic, George Dabos, Nikos Passalis, Manos Kirtas, Nikos Bamiedakis, Anastasios Tefas, and  others
    In European Conference on Optical Communication (ECOC), 2021
  17. Compute with light: architectures, technologies and training models for neuromorphic photonic circuits
    Nikos Pleros, Miltiadis Moralis-Pegios, Angelina Totovic, George Dabos, Apostolos Tsakyridis, George Giamougiannis, George Mourgias-Alexandris, Nikos Passalis, Manos Kirtas, and Anastasios Tefas
    In European Conference on Optical Communication (ECOC), 2021
  18. A Silicon Photonic Coherent Neuron with 10GMAC/sec processing line-rate
    George Mourgias-Alexandris, Miltiadis Moralis-Pegios, Stelios Simos, George Dabos, Nikos Passalis, Manos Kirtas, Teerapat Rutirawut, Frederic Y Gardes, Anastasios Tefas, and Nikos Pleros
    In Optical Fiber Communication Conference, 2021

2020

  1. Neuromorphic computing through photonic integrated circuits
    George Mourgias-Alexandris, A Totovic, N Passalis, George Dabos, Anastasios Tefas, and N Pleros
    In Smart Photonic and Optoelectronic Integrated Circuits XXII, 2020
  2. Adaptive normalization for forecasting limit order book data using convolutional neural networks
    In IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2020
  3. Heterogeneous knowledge distillation using information flow modeling
    Nikolaos Passalis, Maria Tzelepi, and Anastasios Tefas
    In IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2020
  4. Deepbots: A webots-based deep reinforcement learning framework for robotics
    M Kirtas, Konstantinos Tsampazis, Nikolaos Passalis, and Anastasios Tefas
    In IFIP International Conference on Artificial Intelligence Applications and Innovations, 2020
  5. Leveraging deep reinforcement learning for active shooting under open-world setting
    A Tzimas, Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Conference on Multimedia and Expo (ICME), 2020
  6. aColor: Mechatronics, Machine Learning, and Communications in an Unmanned Surface Vehicle
    Jose Villa Escusol, Jussi Taipalmaa, Mikhail Gerasimenko, Alexander Pyattaev, Mikko Ukonaho, Honglei Zhang, Jenni Raitoharju, Nikolaos Passalis, Antti Perttula, Jussi Aaltonen, and  others
    Proceedings of Transport Research Arena TRA, 2020
  7. Photonic Recurrent Neural Networks with Gating Circuit
    George Dabos, George Mourgias-Alexandris, Angelina Totović, Nikolaos PassalisAnastasios Tefas, and Nikos Pleros
    In Conference on Lasers and Electro-Optics (CLEO), 2020
  8. Improving Universal Style Transfer using Sub-style Decomposition
    Paraskevas Pegios, Nikolaos Passalis, and Anastasios Tefas
    In Hellenic Conference on Artificial Intelligence, 2020
  9. Multilayer probabilistic knowledge transfer for learning image representations
    Nikolaos Passalis, Maria Tzelepi, and Anastasios Tefas
    In IEEE International Symposium on Circuits and Systems (ISCAS), 2020
  10. Adaptive Initialization for Recurrent Photonic Networks using Sigmoidal Activations
    Nikolaos Passalis, George Mourgias-Alexandris, Nikos Pleros, and Anastasios Tefas
    In IEEE International Symposium on Circuits and Systems (ISCAS), 2020
  11. Different color spaces in deep learning-based water segmentation for autonomous marine operations
    Jussi Taipalmaa, Nikolaos Passalis, and Jenni Raitoharju
    In IEEE International Conference on Image Processing (ICIP), 2020
  12. Efficient Adaptive Inference Leveraging Bag-of-Features-based Early Exits
    Nikolaos Passalis, Jenni Raitoharju, Moncef Gabbouj, and Anastasios Tefas
    In IEEE International Workshop on Multimedia Signal Processing (MMSP), 2020
  13. Leveraging Active Perception for Improving Embedding-based Deep Face Recognition
    Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Workshop on Multimedia Signal Processing (MMSP), 2020
  14. Improving Deep Reinforcement Learning for Financial Trading Using Neural Network Distillation
    Avraam Tsantekidis, Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Workshop on Machine Learning for Signal Processing (MLSP), 2020
  15. Global Adaptive Input Normalization for Short-Term Electric Load Forecasting
    Nikolaos Passalis, and Anastasios Tefas
    In IEEE Symposium Series on Computational Intelligence (SSCI), 2020
  16. Time-series classification with an all-optical recurrent neuron
    George Mourgias-Alexandris, Nikolaos Passalis, George Dabos, A Totović, Anastasios Tefas, and Nikos Pleros
    In European Conference on Optical Communications (ECOC), 2020

2019

  1. Experimental demonstration of an optical neuron with a logistic Sigmoid activation function
    George Mourgias-Alexandris, Apostolos Tsakyridis, Nikolaos PassalisAnastasios Tefas, and Nikos Pleros
    In Optical Fiber Communication Conference, 2019
  2. Deep temporal logistic bag-of-features for forecasting high frequency limit order book time series
    In International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2019
  3. Deep reinforcement learning for financial trading using price trailing
    Konstantinos Saitas Zarkias, Nikolaos Passalis, Avraam Tsantekidis, and Anastasios Tefas
    In IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2019
  4. Variance preserving initialization for training deep neuromorphic photonic networks with sinusoidal activations
    Nikolaos Passalis, George Mourgias-Alexandris, Apostolos Tsakyridis, Nikos Pleros, and Anastasios Tefas
    In IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2019
  5. Reversible privacy preservation using multi-level encryption and compressive sensing
    Mehmet Yamaç, Mete Ahishali, Nikolaos Passalis, Jenni Raitoharju, Bulent Sankur, and Moncef Gabbouj
    In European Signal Processing Conference (EUSIPCO), 2019
  6. Face verification and recognition for digital forensics and information security
    Giuseppe Amato, Fabrizio Falchi, Claudio Gennaro, Fabio Valerio Massoli, Nikolaos PassalisAnastasios Tefas, Alessandro Trivilini, and Claudio Vairo
    In International Symposium on Digital Forensics and Security (ISDFS), 2019
  7. Adaptive inference using hierarchical convolutional bag-of-features for low-power embedded platforms
    Nikolaos Passalis, Jenni Raitoharju, Anastasios Tefas, and Moncef Gabbouj
    In IEEE International Conference on Image Processing (ICIP), 2019
  8. Class-based variational representation learning for robust image retrieval
    In IEEE International Conference on Image Processing (ICIP), 2019
  9. High-resolution water segmentation for autonomous unmanned surface vehicles: a novel dataset and evaluation
    Jussi Taipalmaa, Nikolaos Passalis, Honglei Zhang, Moncef Gabbouj, and Jenni Raitoharju
    In IEEE International Workshop on Machine Learning for Signal Processing (MLSP), 2019
  10. Curriculum-based teacher ensemble for robust neural network distillation
    Georgios Panagiotatos, Nikolaos PassalisAlexandros IosifidisMoncef Gabbouj, and Anastasios Tefas
    In European Signal Processing Conference (EUSIPCO), 2019
  11. Less Is More: Deep Learning Using Subjective Annotations For Sentiment Analysis From Social Media
    Christina Tzogka, Nikolaos PassalisAlexandros IosifidisMoncef Gabbouj, and Anastasios Tefas
    In IEEE International Workshop on Machine Learning for Signal Processing (MLSP), 2019
  12. A linear photonic neuron using an extended iq modulator cell for enabling all-optical coherent sigmoid neurons
    George Mourgias-Alexandris, Angelina Totovic, Apostolos Tsakyridis, Nikolaos PassalisAnastasios Tefas, Konstantinos Vyrsokinos, and Nikos Pleros
    In European Conference on Optical Communication (ECOC), 2019

2018

  1. Visual question answering using explicit visual attention
    Vasileios Lioutas, Nikolaos Passalis, and Anastasios Tefas
    In IEEE International Symposium on Circuits and Systems (ISCAS), 2018
  2. Efficient camera control using 2D visual information for unmanned aerial vehicle-based cinematography
    Nikolaos PassalisAnastasios Tefas, and Ioannis Pitas
    In IEEE International Symposium on Circuits and Systems (ISCAS), 2018
  3. Deep reinforcement learning for frontal view person shooting using drones
    Nikolaos Passalis, and Anastasios Tefas
    In IEEE Conference on Evolving and Adaptive Intelligent Systems (EAIS), 2018
  4. Learning deep representations with probabilistic knowledge transfer
    Nikolaos Passalis, and Anastasios Tefas
    In European Conference on Computer Vision (ECCV), 2018
  5. Learning Discriminative Representations for Big Data Clustering Using Similarity-Based Dimensionality Reduction
    Nikolaos Passalis, and Anastasios Tefas
    In IEEE Image, Video, and Multidimensional Signal Processing Workshop (IVMSP), 2018
  6. Decoding Generic Visual Representations from Human Brain Activity Using Machine Learning
    Angeliki Papadimitriou, Nikolaos Passalis, and Anastasios Tefas
    In European Conference on Computer Vision (ECCV) Workshops, 2018
  7. Neural Network Knowledge Transfer using Unsupervised Similarity Matching
    Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Pattern Recognition (ICPR), 2018
  8. Fast, visual and interactive semi-supervised dimensionality reduction
    Dimitris Spathis, Nikolaos Passalis, and Anastasios Tefas
    In European Conference on Computer Vision (ECCV) Workshops, 2018
  9. Accelerating Similarity-Based Discriminant Analysis Using Class-Specific Prototypes
    Nikolas Passalis, and Anastasios Tefas
    In IEEE International Conference on Image Processing (ICIP), 2018

2017

  1. Learning Bag-of-Features Pooling for Deep Convolutional Neural Networks
    Nikolaos Passalis, and Anastasios Tefas
    In The IEEE International Conference on Computer Vision (ICCV), 2017
  2. Improving Face Pose Estimation Using Long-Term Temporal Averaging for Stochastic Optimization
    Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Engineering Applications of Neural Networks (EANN), 2017
  3. Forecasting stock prices from the limit order book using convolutional neural networks
    Avraam Tsantekidis, Nikolaos PassalisAnastasios TefasJuho KanniainenMoncef Gabbouj, and Alexandros Iosifidis
    In IEEE Conference on Business Informatics (CBI), 2017
  4. Using deep learning to detect price change indications in financial markets
    Avraam Tsantekidis, Nikolaos PassalisAnastasios TefasJuho KanniainenMoncef Gabbouj, and Alexandros Iosifidis
    In European Signal Processing Conference (EUSIPCO), 2017
  5. Concept detection and face pose estimation using lightweight convolutional neural networks for steering drone video shooting
    Nikolaos Passalis, and Anastasios Tefas
    In European Signal Processing Conference (EUSIPCO), 2017
  6. Time-series classification using neural bag-of-features
    Nikolaos Passalis, Avraam Tsantekidis, Anastasios TefasJuho KanniainenMoncef Gabbouj, and Alexandros Iosifidis
    In European Signal Processing Conference (EUSIPCO), 2017

2016

  1. Spectral clustering using optimized bag-of-features
    Nikolaos Passalis, and Anastasios Tefas
    In Hellenic Conference on Artificial Intelligence, 2016
  2. Spatial bag of features learning for large scale face image retrieval
    Nikolaos Passalis, and Anastasios Tefas
    In INNS Conference on Big Data, 2016
  3. Bag of Embedded Words learning for text retrieval
    Nikolaos Passalis, and Anastasios Tefas
    In International Conference on Pattern Recognition (ICPR), 2016

2015

  1. Multispot: Spotting sentiments with semantic aware multilevel cascaded analysis
    Despoina Chatzakou, Nikolaos Passalis, and Athena Vakali
    In International Conference on Big Data Analytics and Knowledge Discovery, 2015