## Personal information

Born: August 15, 1982 in Heraklion Crete, Greece.

Marital Status: Married with 2 children.

Citizenship: Greek.

Languages: Greek and English.

Military Obligations: Fulfilled.

## Affiliations

2020/10-Today: Adjunct Faculty, Department of Mathematics and Applied Mathematics, University of Crete.

2022/02-Today: Collaborating Researcher, Institute of Physics the Earth’s Interior & Geohzards (IFEGG), Hellenic Mediterranean University.

2022/03-Today: Postdoctoral Researcher, School of Applied Mathematical and Physical Sciences, National Technical University of Athens (NTUA).

- project: New Paradigms in Mathematical Finance Modeling, Analysis, Computation
- supervisors: A. Papapantoleon (TU DELFT and NTUA), E. Georgoulis (U Leicester and NTUA), M. Loulakis (NTUA)

## Research Fields

**The basic mathematical/machine learning tools I have used in various applied fields belongs to the following categories:**

M1. Mathematical Modelling (Since 2008)

M2. Scientific Computing (Since 2008)

M3. Stochastic Analysis (Since 2015)

M4. Probabilistic Models (Since 2015)

M5. Machine Learning (Since 2009)

M6. Reinforcement Learning (Since 2019)

M7. Statistical Inference (Since 2009)

M8. Information Theory (Since 2009)

M9. Inverse Problems (Since 2008)

M10. Solving PDEs using Machine Learning (Since 2022)

**My contributions include problems from the following five scientific areas:**

SA1. Ocean Acoustics / Seismo-acoustics (2008-today) [Active] - (M1, M2, M4, M5, M7, M8, M9, M10)

SA2. Seismology (2017-today) [Very Active] - (M1, M2, M3, M5, M6, M7, M9, M10)

SA3. Mathematical Finance (2021-today) [Very Active] - (M1, M2, M3, M5, M8, M10)

SA4. Denoising/Deblurring of acoustic and seismic signals (2015-today) [Active] - (M1, M2, M5, M7)

SA5. Bioacoustics/Psychoacoustics (2013-2015) [Inactive] - (M1, M2, M5)

## Education

** BSc** in Applied Mathematics, Department of Applied Mathematics, University of Crete (2000-2005).

** MSc** in Mathematical Modeling and Scientific Computing, Departments of Mathematics and Applied Mathematics, University of Crete (2005-2008).

- Master thesis: On the use of Genetic Algorithms and a statistical characterization of the acoustic signal for tomographic and bottom geoacoustic inversions (in Greek).
- Supervisor : Michael Taroudakis.

** PhD** in Applied Mathematics, Department of Mathematics and Applied Mathematics, University of Crete (2012-2019).

- PhD thesis : Acoustic Signal Characterization using Hidden Markov Models with applications in Acoustical Oceanography.
- Supervisor : Michael Taroudakis.

## Teaching

Spring Semester 2021-2202: Course MEM 284 - Wave Propagation

Spring Semester 2021-2022: Course MEM 205 - Descriptive Statistics

Fall Semester 2021-2022: Course MEM 100 - Analytical Geometry and Complex Numbers

- https://polyhedron.math.uoc.gr/2122/moodle/course/view.php?id=5
- I do not provide the course evaluation since the course was co-taught with another instructor (GDPR Data Protection)

Spring Semester 2020-2021: Course MEM 264 - Applied Statistics

Spring Semester 2020-2021: Course MEM 205 - Descriptive Statistics

Fall Semester 2020-2021: Course MEM 262 - Parametric Statistics

Spring Semester 2019-2020: Course MEM 205 - Descriptive Statistics

- https://kesmarag.gitlab.io/descriptive-statistics
- Νo course evaluation was carried out due to the COVID-19 pandemic

## Past Employments

2003/02-2003/06: Work Placement, Sensitivity Kernels of the Green function in Ocean Acoustic Waveguides, IACM/FORTH (Supervisor : Emmanuel Skarsoulis).

2006-2008 and 2012-2019: Teaching Assistant at Department of Mathematics and Applied Mathematics.

2013/09-2015/08: Research Fellow (KRHPIS/PEFYKA - General Secretariat for Research and Technology), IACM/FORTH.

2016/01-2016/10: Research Fellow (SIEMENS - General Secretariat for Research and Technology), IACM/FORTH.

2017/04-2018/04: Research Fellow (ARCHERS - Stavros Niarchos Foundation), IACM/FORTH.

2018/08-2019/07: Research Fellow (KRHPIS/PERAN - General Secretariat for Research and Technology), IACM/FORTH.

2019/08-2019/11: Postdoctoral Researcher (KRHPIS/PERAN - General Secretariat for Research and Technology), IACM/FORTH.

2020/01-2020/03: Postdoctoral Researcher (KRHPIS/POLITEIA - General Secretariat for Research and Technology), IACM/FORTH.

2020/02-2020/07: Adjunct Faculty (ΠΔ 407/80), Deptartment of Mathematics and Applied Mathematics, University of Crete.

2021/05-2022/02: Postdoctoral Researcher (TURNKEY - HORIZON), Institute of Geodynamics, National Observatory of Athens.

## Technical Skills

Programming Languages: Fortran, C, ** C++**,

**, Java,**

**Rust****, Elisp.**

**Python**Scientific Libraries: Numpy, Scipy, Scikit-learn, ** TensorFlow**,

**Pandas, Eigen3**

**PyTorch**Seismological Software: Seiscomp3, Instaseis, AxiSEM, Specfm2D, ObsPy

Databases: MariaDB, SQLite

Operating System: GNU/Linux (Fedora/RHEL and Gentoo).

Software Containerization Platforms: Docker-Podman, Conda, Virtualenv.

Typesetting: LaTeX, OrgMode

## Code

https://sourcehut.com/~kesmarag

## Research Mentorships

2019/09 - 2019/12: Assistant Mentor, Department of Mathematics and Applied Mathematics, University of Crete

- Olga Sambataro’s trainship (Erasmus+ EQF level 7)
- Underwater Acoustics, Propagation Modeling, Signal Processing

2020: Supervisor, Department of Mathematics and Applied Mathematics, University of Crete

- Panteleimon Sfakianakis’ bachelor thesis
- Applying Machine Learning Techniques for Preventive Maintenance of Professional Equipment

2022: Supervisor, Department of Mathematics and Applied Mathematics, University of Crete

- Stylianos Grammatikakis’ bachelor thesis
- Statistical analysis of seismicity in Arkalochori

2022: Supervisor, Department of Mathematics and Applied Mathematics, University of Crete

- Vassiliki Kalogera’ bachelor thesis
- Machine learning and Geographic Information Systems

2022: Supervisor, Department of Mathematics and Applied Mathematics, University of Crete

- Dionysia Petropoulou’ bachelor thesis
- Music genre classification using machine learning techniques

## Peer Reviews for

Journal of the Acoustical Society of America (JASA)

Sensors - MDPI

Dynamical Systems - Frontiers in Applied Mathematics and Statistics

Sustainability - MDPI

## Memberships

(since 2014) Hellenic Institute of Acoustics (HELINA).

(since 2018) Seismological Society of America (SSA).

(since 2019) American Statistical Association (ASA) [ID 223078]

(since 2019) Ocean Expert [ID 37775]

(since 2020) Editorial Board of Dynamical Systems, Frontiers in Applied Mathematics and Statistics

(since 2021) Topic Editor of Sustainability - MDPI

## Publications

2020: Smaragdakis C. and Taroudakis M.I.: ``Acoustic signal characterization based on Hidden Markov Models with applications to geoacoustic inversions", Journal of the Acoustical Society of America Vol. 148, pp 2337-2350.

2020: Smaragdakis C. and Taroudakis M.I.: ``Probabilistic Characterisation of Acoustic and Seismic Signals" ERCIM News 122, Special Theme: Solving Engineering Problems with Machine Learning, pp. 35-36.

2017: Taroudakis M., Smaragdakis C and Chapman N.R.: ``De-noising procedures for inverting underwater acoustic signals in applications of acoustical oceanography" J. Comp. Acous. Vol. 25, pp. 1750015-1-23.

2014: Taroudakis M.I., Smaragdakis C. and Chapman, N.R. ``Inversion of acoustical data from the `Shallow Water 06’ experiment, using a statistical method for signal characterization " Journal of the Acoustical Society of America Vol. 136, pp. EL336-EL342.

2013: Taroudakis M.I. and Smaragdakis C. ``Inversions of statistical parameters of an acoustic signal in range-dependent environments with applications in ocean acoustic tomography" Journal of the Acoustical Society of America Vol. 134, pp 2814-2822.

2009: Taroudakis M.I. and Smaragdakis C. ``Tomographic and Bottom Geoacoustic Inversions Using Genetic Algorithms and a Statistical Characterization of the Acoustic Signal, Acta Acustica united with Acustica Vol 95, No 5, pp 814-822.

## Preprints

2022: Costas Smaragdakis, John Mastrokalos, Michael I Taroudakis: ``Statistical Characterization of Seismic Signals", Journal of Theoretical and Computational Acoustics (accepted)

2022: V. Taroudaki, Costas Smaragdakis: ``Deblurring acoustic signals using optimal filtering", Acta Acustica united with Acustica (under review)

2022: Smaragdakis C. and Melis N.: ``Strong Ground Motion Simulations" (under preparation).

## Conference Proceedings

2021: Smaragdakis C., Melis N.: ``Strong ground motion simulation in the near field: An application to the M7.0 Samos 2020 earthquake", 37th General Assembly of the European Seismological Commission, 19 - 24 Semtember 2020, virtual.

2020: Sambataro O., Smaragdakis C. and Taroudakis M.: ``A comparison of processing techniques applied to time-frequency representation of acoustic signals intended for geoacoustic inversions" in Proceedings e-Forum Acusticum 2020, pp 1769-1775.

2019: Smaragdakis C., Taroudakis M. ``Acoustic Signal Characterization using Hidden Markov Models with applications in Acoustical Oceanography.", Abstract in Proceedings ICA 2019 and EAA Euroregio, 9 - 13 September 2019, Aachen, Germany, pp 5399

2018: Smaragdakis C., Mastrokalos J. and Taroudakis M. ``Classification of acoustic and seismic signals based on the statistics of their wavelet sub-band coefficients", The Journal of the Acoustical Society of America 144(3):1914-1914 DOI: 10.1121/1.5068386.

2018: Taroudaki V., Taroudakis M. and Smaragdakis C. ``Statistical optimal filtering method for acoustical signal deblurring", The Journal of the Acoustical Society of America 144(3):1689-1689 DOI: 10.1121/1.5067509

2018: Smaragdakis C., Taroudakis M. ``Similarity measurements of acoustical and seismic signals using Hidden Markov Models", In Proceedings of 5th Acoustic Conference of HELINA, Patras (In Greek)

2017: Smaragdakis C. and Taroudakis M. : ``A probabilistic approach based on Hidden Markov Models for the estimation of the geoacoustic parameters of the sea bottom", 4th Underwater Acoustics Conference and Exhibition, Skiathos, Greece.

2017: Taroudaki V., Smaragdakis C. and Taroudakis M. ``Statistical Near-Optimal Filtering Method with Application to Underwater Acoustics", Abstract of Paper Procedings in AMS Meetings, Vol 38 No 1, Issue 187, p 220.

2016: Taroudaki V., Smaragdakis C. and Taroudakis M. ``Deblurring acoustic signals for statistical characterization in application of ocean acoustic tomography" in the Journal of the Acoustical Society of America 140(4):3135-3135.

2016: Taroudakis M. and Smaragdakis C. ``Ocean acoustic tomography using a three-phased probabilistic model-based inversion scheme" in Proceedings of the ICA 2016, Buenos Aires.

2016: Smaragdakis C. and Taroudakis M. ``Hidden Markov Models feature extraction for inverting underwater acoustic signals using wavelet packet coefficients", EuroRegio2016, Porto, Portugal.

2016: Smaragdakis C., Taroudakis M. ``Ocean acoustic tomography using a three-phased probabilistic model-based inversion scheme", In Proceedings of the 4th Acoustic Conference of HELINA, Piraeus (In Greek).

2015: Taroudakis M. and Smaragdakis C. ``De-noising procedures for inverting underwater acoustic signals in applications of acoustical oceanography" in Proceedings of EuroNoise 2015 31 May - 3 June, Maastricht.

2014: Taroudakis M. and Smaragdakis C. ``A hybrid approach for ocean acoustic tomography in range dependent environments based on statistical characterization of the acoustic signal and the identification of modal arrivals" in Proceedings of FORUM ACUSTICUM 2014 (CD edition), Krakow, Poland.

2014: Smaragdakis C and Taroudakis M. ``Characterization of underwater acoustic signals, using a bio-mathematical model of the psycho-acoustic mechanisms of Humpback whales." in Proceedings of 7th Acoustic Conference of HELINA, Thessaloniki (In Greek).

2014: Taroudakis M. and Smaragdakis C. ``A hybrid approach for ocean acoustic tomography based on statistical characterization of the acoustic signal and the identification of modal arrivals" in Proceedings of the 2nd Underwater Acoustics Conference edited by J.S. Papadakis and L. Bjorno, Rhodes, Greece, pp 691-698.

2012: Taroudakis M. and Smaragdakis C. ``Inversions of Statistical Parameters of an Acoustic Signal in Range-Dependent Environments, with Applications in Ocean Acoustic Tomography" in Proceedings of the 11th European Conference on Underwater Acoustics, Edinburgh, pp 962-969.

2010: Papadakis P., Smaragdakis C., Taroudakis M. and Tolstoy A. ``Hybrid inversion techniques for geoacoustic inversion" in Proceedings of the 9th European Conference on Underwater Acoustics, Istanbul.

2010: Taroudakis M. and Smaragdakis C. ``Underwater Acoustic Signal Characterization in the presence of Noise", in Internoise 2010, CD Rom edition, Lisbon.

## Invited lectures

28/04/2021 - Eastern Washington University : ``Characterization of Time-Series using Hidden Markov Models"