Publications
THESES
[T4] "Design of Data Adaptive Risk Measures For Early Detection of Financial Critical Events," PhD Thesis, University of Bordeaux, Economics, Business and Society Doctoral School (EES - ED 42), Research Institute for the Management of Organizations (IRGO - EA 4190), 2022.
[T3] "Bayesian Compressed Sensing using Alpha-Stable Distributions," PhD Thesis, University of Crete, Department of Computer Science, 2009.
[T2] "Content-based Image Retrieval via Alpha-Stable Modelling of Texture Information," MSc Thesis, University of Crete, Department of Computer Science, 2004.
[T1] "The Wavelet Transform in Mode Identification," Diploma Thesis, University of Crete, Department of Mathematics, 2002.
BOOK CHAPTERS
[B2] G. Tzagkarakis and T. Dionysopoulos, "Restoring Corrupted Cross-Recurrence Plots using Matrix Completion: Application on the Time-Synchronization between Market and Volatility Indexes," Recurrence Plots and Their Quantifications: Expanding Horizons, C. L. Webber, Jr., C. Ioana, and N. Marwan (Eds.), Springer, pp. 241-263, 2016 (doi:10.1007/978-3-319-29922-8_13).
[B1] G. Tzagkarakis, G. Tsagkatakis, D. Alonso, C. Asensio, E. Celada, A. Panousopoulou, P. Tsakalides, and B. Beferull-Lozano, "Signal and Data Processing Techniques for Industrial Cyber-Physical Systems," Cyber-Physical Systems: From Theory to Practice, D. B. Rawat, J. Rodrigues, and I. Stojmenovic (Eds.), CRC Press, USA, Ch. 8, 2015 (doi:10.1201/b19290).
PEER-REVIEWED JOURNAL PAPERS
[J28] G. Tzagkarakis, F. Maurer, and J. P. Nolan, "Taming Impulsive High-Frequency Data Using Optimal Sampling Periods," Annals of Operations Research, 2023 (doi:10.1007/s10479-023-05701-y).
[J27] A. Pentari, N. Simos, G. Tzagkarakis, A. Kagialis, G. Bertsias, E. Kavroulakis, E. Gratsia, P. Sidiropoulos, D. T. T Boumpas, and E. Papadaki, "Altered Hippocampal Connectivity Dynamics Predicts Memory Performance in Neuropsychiatric Lupus: A Resting-State fMRI Study Using Cross-Recurrence Quantification Analysis," Lupus Science & Medicine, 10:e000920, 2023 (doi:10.1136/lupus-2023-000920).
[J26] M. Shabani, M. Magris, G. Tzagkarakis, J. Kanniainen, and A. Iosifidis, "Predicting the State of Synchronization of Financial Time Series using Cross Recurrence Plots," Neural Computing and Applications, June 2023 (doi:10.1007/s00521-023-08674-y).
[J25] G. Tzagkarakis and F. Maurer, "Horizon-Adaptive Extreme Risk Quantification for Cryptocurrency Assets," Computational Economics, Vol. 62, pp. 1251-1286, 2023 (doi:10.1007/s10614-022-10300-3) (Manuscript published online in Sept. 2022, and in hard copy in 2023).
[J24] A. Pentari, G. Tzagkarakis, K. Marias, and P. Tsakalides, "Graph Denoising of Impulsive EEG Signals and the Effect of their Graph Representation," Biomedical Signal Processing and Control, Vol. 78, 103886, September 2022 (doi:10.1016/j.bspc.2022.103886).
[J23] K. Bountrogiannis, G. Tzagkarakis, and P. Tsakalides, "Distribution Agnostic Symbolic Representations for Time Series Dimensionality Reduction and Online Anomaly Detection," IEEE Trans. on Knowledge and Data Engineering, May 2022 (doi:10.1109/TKDE.2022.3174630). [Matlab Code for pSAX, Matlab Code for cSAX]
[J22] A. Pentari, G. Tzagkarakis, P. Tsakalides, P. Simos, G. Bertsias, E. Kavroulakis, K. Marias, N. J. Simos, and E. Papadaki, "Changes in Resting-State Functional Connectivity in Neuropsychiatric Lupus: A Dynamic Approach Based on Recurrence Quantification Analysis," Biomedical Signal Processing and Control, Vol. 72, Part A, 103285, February 2022 (doi:10.1016/j.bspc.2021.103285).
[J21] G. Tzagkarakis, J. P. Nolan, and P. Tsakalides, "Robust Nonlinear Compressive Sampling Using Symmetric Alpha-Stable Distributions," Signal Processing, Vol. 182, 107944, May 2021 (doi:10.1016/j.sigpro.2020.107944).
[J20] G. Tzagkarakis, P. Charalampidis, S. Roubakis, A. Makrogiannakis, and P. Tsakalides, "Quantifying the Computational Efficiency of Compressive Sensing in Smart Water Network Infrastructures," Sensors, Vol. 20, No. 11, 3299, June 2020 (doi:10.3390/s20113299).
[J19] G. Tzagkarakis and F. Maurer, "An Energy-based Measure for Long-Run Horizon Risk Quantification," Annals of Operations Research, Vol. 289, No. 2, pp. 363-390, 2020 (doi:10.1007/s10479-020-03609-5).
[J18] M. Kvakić, G. Tzagkarakis, S. Pellerin, P. Ciais, D. S. Goll, A. Mollier, and B. Ringeval, "Carbon and Phosphorus Allocation in Annual Plants: An Optimal Functioning Approach," Frontiers in Plant Science, Vol. 11, Article 149, February 2020 (doi:10.3389/fpls.2020.00149).
[J17] G. Tzagkarakis, J. P. Nolan, and P. Tsakalides, "Compressive Sensing Using Symmetric Alpha-Stable Distributions For Robust Sparse Signal Reconstruction," IEEE Trans. on Signal Processing, Vol. 67, No. 3, pp. 808-820, February 2019 (doi:10.1109/TSP.2018.2887400).
[J16] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Sparse Modeling of Volatile Financial Time Series via Low-Dimensional Patterns Over Learned Dictionaries," Algorithmic Finance, Vol. 4, pp. 139-158, 2015 (doi:10.3233/AF-150051).
[J15] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Time-Frequency Adapted Market Integration Measure Based on Hough Transformed Multiscale Decompositions," Computational Economics, Vol. 48, No. 1, pp. 1-27, ISSN (Online) 1572-9974, August 2015 (doi:10.1007/s10614-015-9518-3) (Manuscript accepted in August 2015. Published in hard copy in June 2016).
[J14] A. Achim, A. Basarab, G. Tzagkarakis, P. Tsakalides, and D. Kouame, "Reconstruction of Ultrasound RF Echoes Modelled as Stable Random Variables," IEEE Trans. on Computational Imaging, Vol. 1, No. 2, pp. 86-95, June 2015 (doi:10.1109/TCI.2015.2463257).
[J13] G. Tzagkarakis, T. Dionysopoulos, and A. Achim, "Recurrence Quantification Analysis of Denoised Index Returns via Alpha-Stable Modeling of Wavelet Coefficients: Detecting Switching Volatility Regimes," Studies in Nonlinear Dynamics & Econometrics, ISSN (Online) 1558-3708, June 2015 (doi:10.1515/snde-2014-0102).
[J12] G. Tsagkatakis, A. Woiselle, G. Tzagkarakis, M. Bousquet, J.-L. Starck, and P. Tsakalides, "Multireturn Compressed Gated Range Imaging," Optical Engineering, Vol. 54, No. 3, 031106, March 2015 (doi:10.1117/1.OE.54.3.031106).
[J11] G. Tzagkarakis, A. Seliniotaki, V. Christophides, and P. Tsakalides, "Uncertainty-Aware Sensor Data Management and Early Warning for Monitoring Industrial Infrastructures," International Journal of Monitoring and Surveillance Technologies Research, Vol. 2, No. 4, pp. 1-24, October-December 2014 (doi:10.4018/IJMSTR.2014100101).
[J10] G. Tzagkarakis, P. Tsakalides, and J.-L. Starck, "Covariation-based Subspace-Augmented MUSIC for Joint Sparse Support Recovery in Impulsive Environments," Signal Processing, Vol. 93, Issue 5, pp. 1365-1373, May 2013 (doi:10.1016/j.sigpro.2012.11.021).
[J9] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Exploiting Market Integration for Pure Alpha Investments via Probabilistic Principal Factors Analysis," Journal of Mathematical Finance - Special issue on "Forecasting and Portfolio Construction", Vol. 3, No. 1A, pp. 192-200, March 2013 (doi:10.4236/jmf.2013.31A018).
[J8] G. Tzagkarakis, E. Pavlopoulou, J. Fadili, G. Hadziioannou, and J.-L. Starck, "Morphological Component Analysis for the Inpainting of Grazing Incidence X-Ray Diffraction Images Used for the Structural Characterization of Thin Films," Oil & Gas Science and Technology-Rev. IFP Energies Nouvelles - Special issue on "Advances in Signal Processing and Image Analysis for Physico-Chemical, Analytical Chemistry and Chemical Sensing", Vol. 69, No. 2, pp. 261-277, 2014 (doi:10.2516/ogst/2012077) (Manuscript accepted in October 2012, Published in hard copy in March 2014).
[J7] D. Milioris, G. Tzagkarakis, A. Papakonstantinou, M. Papadopouli, and P. Tsakalides, "Low-dimensional Signal-Strength Fingerprint-based Positioning in Wireless LANs," Ad Hoc Networks, Vol. 12, pp. 100-114, January 2014 (doi:10.1016/j.adhoc.2011.12.006) (Manuscript accepted in 2011, Published in hard copy in January 2014).
[J6] G. Tzagkarakis, M. Papadopouli, and P. Tsakalides, "Trend Forecasting based on Singular Spectrum Analysis of Traffic Workload in a Large-Scale Wireless LAN," Performance Evaluation, Vol. 66, No. 3, pp. 173-190, 2009 (doi:10.1016/j.peva.2008.10.010).
[J5] G. Tzagkarakis, B. Beferull-Lozano, and P. Tsakalides, "Rotation-Invariant Texture Retrieval via Signature Alignment based on Steerable sub-Gaussian Modeling," IEEE Trans. on Image Processing, Vol. 17, No. 7, pp. 1212-1225, June 2008 (doi:10.1109/TIP.2008.924390).
[J4] G. Tzagkarakis, M. Taroudakis, and P. Tsakalides, "A Statistical Geoacoustic Inversion Scheme based on a Modified Radial Basis Functions Neural Network," Journal of Acoustical Society of America (JASA), Vol. 122, No. 4, pp. 1959-1968, 2007 (doi:10.1121/1.2772232).
[J3] G. Tzagkarakis, B. Beferull-Lozano, and P. Tsakalides, "Rotation-Invariant Texture Retrieval with Gaussianized Steerable Pyramids," IEEE Trans. on Image Processing, Vol. 15, No. 9, pp. 2702-2718, September 2006 (doi:10.1109/TIP.2006.877356).
[J2] M. Taroudakis, G. Tzagkarakis, and P. Tsakalides, "Classification of Shallow-Water Acoustic Signals via Alpha-Stable Modeling of the One-Dimensional Wavelet Coefficients," Journal of Acoustical Society of America (JASA), Vol. 119, No. 3, pp. 1396-1405, March 2006 (doi:10.1121/1.2165003).
[J1] M. Taroudakis and G. Tzagkarakis, "On the Use of the Reassigned Wavelet Transform for Mode Identification," Journal of Computational Acoustics, Vol. 12, No. 2, pp. 175-196, June 2004 (doi:10.1142/S0218396X04002237).
PEER-REVIEWED CONFERENCE PAPERS
[C57] T. Kyprianidi, E. Doutsi, G. Tzagkarakis, and P. Tsakalides, "Exploring the Potential of Recurrence Quantification Analysis for Video Analysis and Motion Detection," in Proc. IEEE International Conference on Image Processing (ICIP), Abu Dhabi, UAE, October 27-30, 2024.
[C56] G. Tzagkarakis, E. Plevridi, and S. Papadakis, "Comparative Analysis of System Architectures for Passive Radars in Drone Detection – The AIRE5G Project," in Proc. 3rd Integrated Air & Missile Defence Center of Excellence (IAMD CoE) Annual Conference, Souda bay, Chania, Greece, June 19-20, 2024.
[C55] G. Tzagkarakis and S. Papadakis, "ML-Empowered Drone Passive Radar Using 5G Signals," in Proc. 2nd Integrated Air & Missile Defence Center of Excellence (IAMD CoE) Annual Conference, Souda bay, Chania, Greece, June 13-14, 2023 (Vol. 2, Nov. 2023, pp. 66-70).
[C54] P. Tsakalides, G. Tsagkatakis, and G. Tzagkarakis, "Enhancing Situational Awareness Through Artificial Intelligence," in Proc. 1st Integrated Air & Missile Defence Center of Excellence (IAMD CoE) Annual Conference, Souda bay, Chania, Greece, September 29-30, 2022 (Vol. 1, Dec. 2022, pp. 11-16).
[C53] G. Tzagkarakis and F. Maurer, "Energy-Preserving Hamiltonian Neural Networks for Stock Price Forecasting," in Proc. 10th International Conference on Curves and Surfaces (CS), Arcachon, France, June 20-24, 2022.
[C52] G. Tzagkarakis, E. Lydaki, and F. Maurer, "Predictive Modeling of Systemic and Tail Risk with Dynamic Graph Connectivity Measures," in Proc. 6th International Workshop on Financial Markets and Nonlinear Dynamics (FMND), Paris, France, June 2-3, 2022.
[C51] G. Tzagkarakis, F. Maurer, and T. Dionysopoulos, "Nonparametric Adaptive Value-at-Risk Quantification Based on the Multiscale Energy Distribution of Asset Returns," in Proc. 28th European Signal Processing Conference (EUSIPCO '20), Amsterdam, NL, January 18-22, 2021 (doi:10.23919/Eusipco47968.2020.9287568).
[C50] A. Pentari, G. Tzagkarakis, K. Marias, and P. Tsakalides, "Graph-based Denoising of EEG Signals in Impulsive Environments," in Proc. 28th European Signal Processing Conference (EUSIPCO '20), Amsterdam, NL, January 18-22, 2021 (doi:0.23919/Eusipco47968.2020.9287329).
[C49] K. Bountrogiannis, G. Tzagkarakis, and P. Tsakalides, "Anomaly Detection for Symbolic Time Series Representations of Reduced Dimensionality," in Proc. 28th European Signal Processing Conference (EUSIPCO '20), Amsterdam, NL, January 18-22, 2021 (doi:10.23919/Eusipco47968.2020.9287474).
[C48] K. Bountrogiannis, G. Tzagkarakis, and P. Tsakalides, "Data-driven Kernel-based Probabilistic SAX for Time Series Dimensionality Reduction," in Proc. 28th European Signal Processing Conference (EUSIPCO '20), Amsterdam, NL, January 18-22, 2021 (doi:10.23919/Eusipco47968.2020.9287311).
[C47] A. Pentari, G. Tzagkarakis, K. Marias, and P. Tsakalides, "A Study on the Effect of Distinct Adjacency Matrices for Graph Signal Denoising," in Proc. 20th IEEE International Conference on Bioinformatics and Bioengineering (BIBE '20), USA (Virtual Conference), October 26-28, 2020 (doi:10.1109/BIBE50027.2020.00091).
[C46] M.-A. Zervou, G. Tzagkarakis, and P. Tsakalides, "Automated Screening of Dyslexia via Dynamical Recurrence Analysis of Wearable Sensor Data," in Proc. 19th IEEE International Conference on Bioinformatics and Bioengineering (BIBE '19), Athens, Greece, October 28-30, 2019 (doi:10.1109/BIBE.2019.00144).
[C45] C. Tzagkarakis, N. Stefanakis, and G. Tzagkarakis, "Impact Sounds Classification for Interactive Applications via Discriminative Dictionary Learning," in Proc. 27th European Signal Processing Conference (EUSIPCO '19), A Coruna, Spain, September 2-6, 2019 (doi:10.23919/EUSIPCO.2019.8902965).
[C44] E. Doutsi, G. Tzagkarakis, and P. Tsakalides, "Neuro-inspired Compression of RGB Images," in Proc. 27th European Signal Processing Conference (EUSIPCO '19), A Coruna, Spain, September 2-6, 2019 (doi:10.23919/EUSIPCO.2019.8903079).
[C43] S. Roubakis, G. Tzagkarakis, and P. Tsakalides, "Real-Time Prototyping of Matlab-Java Code Integration for Water Sensor Networks Applications," in Proc. 27th European Signal Processing Conference (EUSIPCO '19), A Coruna, Spain, September 2-6, 2019 (doi:10.23919/EUSIPCO.2019.8902633). [Java Code]
[C42] V. Sideridis, A. Zacharakis, G. Tzagkarakis, and M. Papadopouli, "GestureKeeper: Gesture Recognition for Controlling Devices in IoT Environments," in Proc. 27th European Signal Processing Conference (EUSIPCO '19), A Coruna, Spain, September 2-6, 2019 (doi:10.23919/EUSIPCO.2019.8903044).
[C41] M.-A. Zervou, G. Tzagkarakis, A. Panousopoulou, and P. Tsakalides, "A Self-Tuned Architecture for Human Activity Recognition Based on a Dynamical Recurrence Analysis of Wearable Sensor Data," in Proc. 27th European Signal Processing Conference (EUSIPCO '19), A Coruna, Spain, September 2-6, 2019 (doi:10.23919/EUSIPCO.2019.8902969).
[C40] G. Tzagkarakis, G. Palagina, I. Smirnakis, S. M. Smirnakis, and M. Papadopouli, "Detection of Stimuli Changes in Neural Eventograms Using the Line of Synchronization of Global Recurrence Plots," in Proc. 2019 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '19), Brighton, UK, May 12-17, 2019 (doi:10.1109/ICASSP.2019.8683460).
[C39] G. Tzagkarakis, J. P. Nolan, and P. Tsakalides, "Compressive Sensing of Temporally Correlated Sources Using Isotropic Multivariate Stable Laws," in Proc. 26th European Signal Processing Conference (EUSIPCO '18), Rome, Italy, September 3-7, 2018 (doi:10.23919/EUSIPCO.2018.8553290).
[C38] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Asset Replication via Sparse Representation Coding," in Proc. 2018 International Symposium in Computational Economics and Finance (ISCEF '18), Paris, France, April 12-14, 2018.
[C37] G. Tzagkarakis, W. Charle, and P. Tsakalides, "Data Compression for Snapshot Mosaic Hyperspectral Image Sensors," in Proc. 24th European Signal Processing Conference (EUSIPCO '16), Budapest, Hungary, August 29-September 2, 2016 (doi:10.1109/EUSIPCO.2016.7760510).
[C36] S. Kartakis, M. Milojevic Jevric, G. Tzagkarakis, and J. A. McCann, "Energy-based Adaptive Compression in Water Network Control Systems," in Proc. 2nd International Workshop on Cyber-Physical Systems for Smart Water Networks (CySWater '16), Vienna, Austria, April 11, 2016 (doi:10.1109/CySWater.2016.7469055).
[C35] S. Kartakis, G. Tzagkarakis, and J. A. McCann, "Adaptive Compressive Sensing in Smart Water Networks," in Proc. 2nd International Electronic Conference on Sensors and Applications (ECSA '15), November 15-30, 2015 (doi:10.3390/ecsa-2-S7002).
[C34] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Exploiting Social Networks Behavioral Information to Model Exchange Rates," in Proc. International Workshop in Financial Markets and Nonlinear Dynamics (FMND '15), Paris, France, June 4-5, 2015.
[C33] G. Tzagkarakis, P. Tsakalides, and J.-L. Starck, "Compressive Video Sensing with Adaptive Measurement Allocation for Improving MPEGx Performance," in Proc. International Conference on Computer Vision Theory and Applications (VISAPP '15), Berlin, Germany, March 11-14, 2015 (doi:10.5220/0005360602540259).
[C32] A. Achim, A. Basarab, G. Tzagkarakis, P. Tsakalides, and D. Kouame, "Reconstruction of Compressively Sampled Ultrasound Images using Dual Prior Information," in Proc. 2014 IEEE International Conference on Image Processing (ICIP '14), Paris, France, October 27-30, 2014 (doi:10.1109/ICIP.2014.7025256).
[C31] A. Seliniotaki, G. Tzagkarakis, V. Christofides, and P. Tsakalides, "Stream Correlation Monitoring for Uncertainty-Aware Data Processing Systems," in Proc. 5th International Conference on Information, Intelligence, Systems and Applications (IISA '14), Chania Crete, Greece, July 7-9, 2014 (doi:10.1109/IISA.2014.6878827).
[C30] G. Tsagkatakis, G. Tzagkarakis, A. Woiselle, M. Bousquet, J.-L. Starck, and P. Tsakalides, "Compressed Sensing Reconstruction of Convolved Sparse Signals," in Proc. 2014 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '14), Florence, Italy, May 4-9, 2014 (doi:10.1109/ICASSP.2014.6854219).
[C29] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Sparse Representation Coding of Financial Data Streams over a Jointly Learned Dictionary," in Proc. 2014 International Symposium in Computational Economics and Finance (ISCEF '14), Paris, France, April 10-12, 2014.
[C28] D. Milioris, G. Tzagkarakis, P. Jacquet, and P. Tsakalides, "WLAN-based Indoor Path Tracking using Compressive RSS Measurements," in Proc. 21st European Signal Processing Conference (EUSIPCO '13), Marrakech, Morocco, September 9-13, 2013.
[C27] G. Tsagkatakis, A. Woiselle, G. Tzagkarakis, M. Bousquet, J.-L. Starck, and P. Tsakalides, "Compressed Gated Range Sensing," in Proc. SPIE Optics+Photonics, Wavelets and Sparsity XV, San Diego, CA, August 25-29, 2013 (doi:10.1117/12.2023901).
[C26] G. Tzagkarakis, A. Achim, P. Tsakalides, and J.-L. Starck, "Joint Reconstruction of Compressively Sensed Ultrasound RF Echoes by Exploiting Temporal Correlations," in Proc. 2013 IEEE International Symposium on Biomedical Imaging (ISBI '13), San Francisco, CA, USA, April 8-11, 2013 (doi:10.1109/ISBI.2013.6556554).
[C25] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Market Integration and Global Risk Measures Based on Probabilistic Principal Factors and Multiscale Time-Frequency Representations," in Proc. IMA Conference on Mathematics in Finance (IMA '13), Edinburgh, UK, April 8-9, 2013.
[C24] G. Tsagkatakis, A. Woiselle, G. Tzagkarakis, M. Bousquet, J.-L. Starck, and P. Tsakalides, "Active Range Imaging via Random Gating," in Proc. SPIE Security+Defence, Edinburgh, UK, September 24-27, 2012 (doi:10.1117/12.974606).
[C23] G. Tzagkarakis, G. Tsagkatakis, J.-L. Starck, and P. Tsakalides, "Compressive Video Classification in a Low-Dimensional Manifold with Learned Distance Metric," in Proc. 20th European Signal Processing Conference (EUSIPCO '12), Bucharest, Romania, August 27-31, 2012.
[C22] G. Tzagkarakis, P. Charalampidis, G. Tsagkatakis, J.-L. Starck, and P. Tsakalides, "Compressive Video Classification for Decision Systems with Limited Resources," in Proc. 29th Picture Coding Symposium (PCS '12), Krakow, Poland, May 7-9, 2012 (doi:10.1109/PCS.2012.6213363).
[C21] G. Tzagkarakis, A. Woiselle, P. Tsakalides, and J.-L. Starck, "Design of a Compressive Remote Imaging System Compensating a Highly Lightweight Encoding with a Refined Decoding Scheme," in Proc. International Conference on Computer Vision Theory and Applications (VISAPP '12), Rome, Italy, February 24-26, 2012.
[C20] G. Tzagkarakis, J.-L. Starck, and P. Tsakalides, "Joint Sparse Signal Ensemble Reconstruction in a WSN Using Decentralized Bayesian Matching Pursuit," in Proc. 19th European Signal Processing Conference (EUSIPCO '11), Barcelona, Spain, August 29-September 2, 2011.
[C19] D. Milioris, G. Tzagkarakis, P. Jacquet, and P. Tsakalides, "Indoor Positioning in Wireless LANs Using Compressive Sensing Signal-Strength Fingerprints," in Proc. 19th European Signal Processing Conference (EUSIPCO '11), Barcelona, Spain, August 29-September 2, 2011.
[C18] D. Milioris, L. Kriara, A. Papakonstantinou, G. Tzagkarakis, P. Tsakalides, and M. Papadopouli, "Empirical Evaluation of Signal-Strength Fingerprint Positioning in Wireless LANs," in Proc. 13th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM '10), Bodrum, Turkey, October 17-21, 2010 (doi:10.1145/1868521.1868525).
[C17] A. Achim, B. Buxton, G. Tzagkarakis, and P. Tsakalides, "Compressive Sensing for Ultrasound RF Echoes Using Alpha-Stable Distributions," in Proc. 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC '10), Buenos Aires, Argentina, September 1-4, 2010 (doi:10.1109/IEMBS.2010.5626210).
[C16] G. Tzagkarakis and P. Tsakalides, "Greedy Sparse Reconstruction of Non-Negative Signals using Symmetric Alpha-Stable Distributions," in Proc. 18th European Signal Processing Conference (EUSIPCO '10), Aalborg, Denmark, August 23-27, 2010.
[C15] G. Tzagkarakis and P. Tsakalides, "Distributed Compressed Sensing of Non-Negative Signals using Symmetric Alpha-Stable Distributions," in Proc. 18th European Signal Processing Conference (EUSIPCO '10), Aalborg, Denmark, August 23-27, 2010.
[C14] G. Tzagkarakis and P. Tsakalides, "Sparse Representation of Medical Images via Compressed Sensing using Gaussian Scale Mixtures," in Proc. 2010 IEEE International Symposium on Biomedical Imaging (ISBI '10), Rotterdam, The Netherlands, April 14-17, 2010.
[C13] G. Tzagkarakis and P. Tsakalides, "Bayesian Compressed Sensing Imaging using a Gaussian Scale Mixture," in Proc. 2010 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '10), Dallas, TX, March 14-19, 2010 (doi:10.1109/ICASSP.2010.5495397).
[C12] G. Tzagkarakis, D. Milioris, and P. Tsakalides, "Multiple-Measurement Bayesian Compressed Sensing using GSM Priors for DOA Estimation," in Proc. 2010 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '10), Dallas, TX, March 14-19, 2010 (doi:10.1109/ICASSP.2010.5496269).
[C11] G. Tzagkarakis and P. Tsakalides, "Bayesian Compressed Sensing of a Highly Impulsive Signal in Heavy-Tailed Noise using a Multivariate Cauchy Prior," in Proc. 17th European Signal Processing Conference (EUSIPCO '09), Glasgow, Scotland, August 24-28, 2009.
[C10] I. Rousidis, G. Tzagkarakis, D. Plexousakis, and Y. Tzitzikas, "On a Probabilistic Combination of Prediction Sources," in Proc. 17th International Symposium on Methodologies for Intelligent Systems (ISMIS '08), York University, Toronto, Canada, May 20-23, 2008 (doi:10.1007/978-3-540-68123-6_58).
[C9] T. Wan, G. Tzagkarakis, P. Tsakalides, N. Canagarajah, and A. Achim, "Context Enhancement Through Image Fusion: a Multiresolution Approach Based on Convolution of Cauchy Distributions," in Proc. 2008 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '08), Las Vegas, Nevada USA, March 30 - April 4, 2008 (doi:10.1109/ICASSP.2008.4517858).
[C8] G. Tzagkarakis, M. Papadopouli, and P. Tsakalides, "Singular Spectrum Analysis of Traffic Workload in a Large-Scale Wireless LAN," in Proc. 10th ACM International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM '07), Chania, Crete, Greece, October 22-26, 2007 (doi:10.1145/1298126.1298146).
[C7] M. Taroudakis, G. Tzagkarakis, and P. Tsakalides, "Characterization of an Underwater Acoustic Signal Using the Statistics of the Wavelet Subband Coefficients," in Proc. 7th International Conference on Theoretical & Computational Acoustics (ICTCA '05), Hang-Zhou, Zhejiang, China, pp. 167-174, September 19-23, 2005 (doi:10.1142/9789812772602_0016).
[C6] G. Tzagkarakis, B. Beferull-Lozano, and P. Tsakalides, "Rotation-Invariant Texture Retrieval with Gaussianized Steerable Pyramids," in Proc. 2005 International Conference on Acoustics, Speech, and Signal Processing (ICASSP '05), Philadelphia, PA, March 19-23, 2005 (doi:10.1109/ICASSP.2005.1415429).
[C5] G. Tzagkarakis, B. Beferull-Lozano, and P. Tsakalides, "Sub-Gaussian Rotation-Invariant Features for Steerable Wavelet-Based Image Retrieval," in Proc. 38th Annual Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, November 7-10, 2004 (doi:10.1109/ACSSC.2004.1399161).
[C4] M. Taroudakis and G. Tzagkarakis, "Characterization of an Underwater Acoustic Signal via the Statistical Distribution of the Wavelet Coefficients," (in Greek), in Proc. of AKOYΣTIKH 2004, Aristotelian University of Thessaloniki, pp. 285-292, 2004.
[C3] M. Taroudakis and G. Tzagkarakis, "Acoustic Signal Representation by the Statistical Distribution of the Wavelet Subband Coefficients for Tomographic Inversion," in Proc. 7th European Conference on Underwater Acoustics (ECUA '04), edited by D. G. Simons, Delft, The Netherlands, pp. 639-644, July 5-8, 2004.
[C2] G. Tzagkarakis and P. Tsakalides, "A Statistical Approach to Texture Image Retrieval via Alpha-Stable Modeling of Wavelet Decompositions," in Proc. 5th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS '04), Lisbon, Portugal, April 21-23, 2004. [Erratum correction]
[C1] M. Taroudakis and G. Tzagkarakis, "On the Use of Wavelet Transform for Acoustic Mode Identification in Shallow Water," (in Greek), in Proc. of AKOYΣTIKH 2002, University of Patras, pp. 119-124, 2002.
PEER-REVIEWED ABSTRACTS
[A13] G. Tzagkarakis, "Early Warning System for Water Microbial Safety," 1st The Luxury Side of Greece Conference (LSGC), Santorini, Greece, April 29-30, 2023 (oral presentation).
[A12] A. Pentari, G. Tzagkarakis, P. Tsakalides, P. Simos, G. Bertsias, E. Kavroulakis, K. Marias, and E. Papadaki, "Filtering of EEG Signals Ensembles using Graph Signal Processing Theory," 3rd Summit on Gender Equality in Computing (GEC 2021), Athens, Greece, July 2, 2021 (poster presentation).
[A11] G. Tzagkarakis and F. Maurer, "Extreme Risk Quantification for High-Frequency Assets Based on Their Inherent Degree of Impulsiveness," 31st European Conference on Operational Research (EURO 2021), Athens, Greece, July 11-14, 2021 (oral presentation).
[A10] M. Kampourakis, E. San Miguel Perez, G. Tzagkarakis, G. Palagina, J. Meyer, S. M. Smirnakis, and M. Papadopouli, "Using RQA Analysis to Identify and Profile Absence Seizures in Stargazer Mice," AREADNE 2020 Research in Encoding And Decoding of Neural Ensembles, Santorini, Greece, June 16-20, 2020 (oral presentation).
[A9] M.-A. Zervou, G. Tzagkarakis, and P. Tsakalides, "Psychiatric Patient Monitoring Based on a Dynamical Recurrence Analysis of Multidimensional Wearable Sensor Data," ACM Celebration of Women in Computing (womENcourage 2019), Rome, Italy, Sept. 16-18, 2019 (poster presentation).
[A8] A. Pentari, G. Tzagkarakis, K. Marias, and P. Tsakalides, "Filtering of EEG Signals Ensembles using Graph Signal Processing Theory," 1st Summit on Gender Equality in Computing (GEC 2019), Athens, Greece, June 7, 2019 (poster presentation).
[A7] M.-A. Zervou, G. Tzagkarakis, G. Palagina, J. Meyer, S. M. Smirnakis, P. Tsakalides, and M. Papadopouli, "Dynamical Recurrence Analysis for Modeling Neural Activity During Epilepsy Seizures," 1st Summit on Gender Equality in Computing (GEC 2019), Athens, Greece, June 7, 2019 (poster presentation).
[A6] M. Kvakic, G. Tzagkarakis, S. Pellerin, P. Ciais, D. Goll, X. Wang, and B. Ringeval, "Carbon and Phosphorus Allocation in Crops: An Optimization Approach," 6th Symposium on Phosphorus in Soils and Plants - From Molecular Scale to Ecosystems (PSP6), Leuven, Belgium, Sept. 10-13, 2018 (poster presentation).
[A5] G. Tzagkarakis, F. Maurer, and T. Dionysopoulos, "Adaptive Quantification of Value-at-Risk Based on the Energy Distribution of Asset Returns," 29th European Conference on Operational Research (EURO 2018), Valencia, Spain, July 8-11, 2018 (oral presentation).
[A4] G. Tzagkarakis and T. Dionysopoulos, "Nonlinear Manifold Learning for Financial Markets Integration," 9th International Conference on Curves and Surfaces (CS 2018), Arcachon, France, June 28-July 4, 2018 (poster presentation).
[A3] G. Tzagkarakis, J. Caicedo-Llano, and T. Dionysopoulos, "Estimation of the Time-Synchronization Profile Between Market and Volatility Indices using Cross-RQA: The S&P500 and VIX Case," 6th International Symposium on Recurrence Plots, Grenoble, France, June 17-19, 2015 (poster presentation).
[A2] G. Tzagkarakis, "Bayesian Compressed Sensing using Alpha-Stable Distributions," Sparsity and Modern Mathematical Methods for High-Dimensional Data, Brussels, Belgium, April 6-10, 2010 (poster presentation).
[A1] M. Taroudakis and G. Tzagkarakis, "Classification of Acoustic Signals Using the Statistics of the 1-D Wavelet Transform Coefficients," 149th Meeting: Acoustical Society of America, Journal of Acoustical Soc. Am., Vol. 117, No. 4, Pt. 2, pp. 2443, April 2005 (oral presentation).
OTHER PUBLICATIONS
[O1] G. Tzagkarakis, M. N. Anastasiadou, and D. G. Eliades, "Smart Water Distribution Networks to Reduce Water Loss," ERCIM News, Vol. 2020, No. 121, April 2020.