Welcome Message

Hi. I'm Nikolaos Petroulakis and this is my personal web page.

I am a Research Scientist at the Telecommunications and Network Lab, Institute of Computer Sciences , Foundation for Research and Development - Hellas since 2007. In addition, I am also a part-time member of Computer Emergency Response Team of FORTH (FORTHcert) since 2009.

I hold a Diploma in Mathematics from the Mathematics Department at the National and Kapodistrian University of Athens, an MSc in “ Digital Communications” from the Department of Engineering and Design , University of Sussex , Brighton, UK and a PhD on Computer Science from Schoool of Mathematics, Computer Science and Engineering, City, University of London , London, UK.

My research interests resolve around network security and resource management in the area of Internet of Things (IoT) and Smart Environments, 5G networking with Software Defined Networking (SDN) and Network Function Virtualisation (NFV), Electromagnetic Field (EMF) Measurements, Cybersecurity and Privacy preservation, wired and wireless networks, cyber-physical systems, Artificial Intelligence (AI) and Machine learning (ML).

Within FORTH I have participated in a variety of European and National projects and proposals. I am also interested to contribute the results of my research in different conferences and journal publications. Finally, I am also a member of the IEEE and serve as a reviewer for various academic venues in my areas of expertise involved also in a numerous of conference and summer schools’ organizations activities.

Projects

  • ARGOS Conceptual Design Study: Designing a Next-Generation Radio Facility for Multi-Messenger Astronomy, HORIZON-INFRA-2022-DEV-01, 01/2023 – 12/2025
  • NextGEM: Next Generation Integrated Sensing and Analytical System for Monitoring and Assessing Radiofrequency Electromagnetic Field Exposure and Health , Project Coordinator, HORIZON-HLTH-2021-ENVHLTH-02-01, 07/2022 – 06/2026
  • PUZZLE: Towards a Sophisticated SIEM Marketplace for Blockchain-based Threat Intelligence and Security-as-a-Service , H2020-SU-DS03-2020, 01/2020 – 8/2023
  • SPIDER: A cyberSecurity Platform for vIrtualiseD 5G cybEr Range services , H2020-SU-DS01-2018, 07/2019 – 06/2022
  • CE-IoT: Circular Eceonomy & Internet of Things - A Framework for Pairing Circular Economy and IoT, H2020 Marie Sklodowska Curie Research and Innovation Staff Exchange – MSCA-RISE, 07/2018 – 06/2022
  • RESIST: RESilient transport InfraSTructure to extreme events, H2020-EU.3.4, GA 7690669, Duration: 9/2018-31/8/2021
  • Ideal-cities: An enabler of trustworthy and sustainable applications for circular smart cities, H2020 Marie Sklodowska Curie Research and Innovation Staff Exchange – MSCA-RISE-2017,07/2018 – 06/2022
  • SEMIoTICS: Smart End-to-end Massive IoT Interoperability, Connectivity and Security , Technical Coordinator, H2020-IoT-03-2017, 01/2018 - 12/2020
  • CyberSure: Cyber Security Insurance - A Framework for Liability Based Trust, H2020 Marie Sklodowska Curie Research and Innovation Staff Exchange – MSCA-RISE, 01/2017 – 12/2020
  • VirtuWind: Virtual and programmable industrial network prototype deployed in operational Wind park, H2020-ICT-2014-2, 5G-PPP Phase 1, 7/2015 - 6/2018
  • Rapid Emergency Deployment Mobile Communication Infrastructure, HOME/2011/CIPS/AG, 2012-2014
  • OPerational Trustworthiness Enabling Technologies, EU FP7 ICT, project no.317631, 2012-2015
  • Environment and Natural Disasters: New methods for measurement and improvement of environmental quality for improved preparedness and response to natural disasters, GSRT, ESPA, National, 2013-2015
  • EU-MESH: Enhanced, Ubiquitous, and Dependable Broadband Access using MESH Networks, Coordinator: Forth-ICS, (EU FP7 ICT, project no. 215320), 2008-2011
  • Design, Management, and Security of Wireless Networks with Support for Quality of Service, funded by Greece General Secretariat for Research and Technology GSRT (05-AKMON-80). Within this project we have deployed Heraklion Mesh, an experimental multi-radio mesh network in the city of Heraklion. The project was selected among the best practices projects in the Operational Programme Competitiveness, 2005-2008
  • Advanced Services Over Wireless Access Networks for Visitors and Tourist Companies and Organizations in Crete, (CRETE-WISE: Advanced Services over Wireless Access Networks), Organizations: FORTHnet, FORTH, Natural History Museum of Crete, Heraklion Port Authority, Crete Aquarium, funded under the Corporate Program of Crete, 2006-2008
  • Efficient Design of IEEE 802.11e Wireless Access Networks (GSRT, Greek-USA Cooperation), 2005-2007
  • WiQoST: Traffic and QoS Management in Wireless Multimedia Networks, COST Action 290, European Coordination in the field of Scientific and Technical Research (COST), which is part of the European Science Foundation (ESF), 2006-2008
  • Routing Protocols in Wireless Mesh Networks based on Cross- Layer Design (GSRT, Greek-Italian Cooperation), 2005-2007
  • Advanced Broadband Services and E-Commerce, action of the Regional Pole for Innovation of Crete (i4crete), 2006-2008

    • Publications

    Book Chapters
  • Nikolaos Petroulakis, Konstantinos Fysarakis, Henrich C. Pöhls, Vivek Kulkarni, George Spanoudakis, Arne Bröring, Manos Papoutsakis, Manolis Michalodimitrakis, Sotiris Ioannidis: Pattern-driven Security, Privacy, Dependability and Interoperability in IoT, book chapter in "Security Risk Management for the Internet of Things: Technologies and Techniques for IoT Security, Privacy and Data Protection", Boston-Delft: now publishers, pages 121-142, June 2020
  • Nikolaos Petroulakis, Konstantinos Fysarakis, Andreαs Miaoudakis, Konstantinos Ramantas, Panos Chatziadam and Christos Verikoukis: Service Chaining Using Software‐Defined Networks, book chapter in “Wiley 5G Ref: The Essential 5G Reference Online”, pages 1-23, December 2019

    • Journals and Magazines
  • Andreas Miaoudakis, Konstantinos Fysarakis, Nikolaos Petroulakis, Sofia Alexaki, George Alexandris, Sotiris Ioannidis, George Spanoudakis, Vasilis Katos, Christos Verikoukis: Pairing a Circular Economy and the 5G-Enabled Internet of Things: Creating a Class of “Looping Smart Assets”, IEEE Vehicular Technology Magazine, volume 15, issue 3, pages 20-31, June 2020
  • Nikolaos E. Petroulakis, Konstantinos Fysarakis, Sotiris Ioannidis, George Spanoudakis, Vivek Kulkarni: Smart End-to-end Massive IoT Interoperability, Connectivity and Security (SEMIoTICS), ERCIM News 2019 (119) (2019)
  • Petra Vizarreta, Amaury van Bemten, Ermin Sakic, Khawar Abbasi, Khawar, Nikolaos E. Petroulakis, Wolfgang Kellerer and Carmen Mas Machuca: Incentives for a Softwarization of Wind Park Communication Networks, IEEE Communications Magazine, 2019
  • N. E. Petroulakis, K. Fysarakis, I. Askoxylakis, G. Spanoudakis: Reactive security for SDN/NFV-enabled industrial networks leveraging service function chaining, Transaction on Emerging Telecommunications Technologies. July 2018
  • N. Ε. Petroulakis, George Spanoudakis, Ioannis G. Askoxylakis: Patterns for the design of secure and dependable software defined networks, Computer Networks 109: 39-49, Elsevier (2016)
  • Ioannis G. Askoxylakis, Nikolaos E. Petroulakis, Vivek Kulkami, Florian Zeiger: VirtuWind - Security in a Virtual and Programmable Industrial Network Prototype Deployed in an Operational Wind Park, ERCIM News 2016 (106) (2016)
  • N. Ε. Petroulakis, E. Ζ. Tragos, A. Fragkiadakis, G. Spanoudakis: A Lightweight Framework for Secure Life-logging in Smart Environments, Information Security Technical Report, Elsevier, Volume 17, Issue 3, February 2013, Pages 58–70
  • A. G. Fragkiadakis, V. Α. Siris, N. Ε. Petroulakis, A. Traganitis: Anomaly-based Intrusion Detection of Jamming Attacks, Local versus Collaborative Detection, in Wiley Wireless Communications and Mobile Computing, pp. 1-19, January 2013.
  • V. A. Siris, E. Z. Tragos, and N. E. Petroulakis: Experiences with a Metropolitan Multi-Radio Wireless Mesh Network : Design, Performance, and Application, in the IEEE Communications Magazine, July 2012

    • Conferences
  • Nikolaos Petroulakis, Panos Chatziadam, Mats-Olof Mattsson, Myrtil Simko, Vasileios Theodorou, Andrianos M. Yiorkas, Andreas Gavrielides, Andreas Miaoudakis, Maria Rosaria Scarfi, Olga Zeni: Designing NIKH: the NextGEM Innovation and Knowledge Hub to Access Next Generation Radio Frequency EMF Exposure and Health Data, in 2022 IEEE Conference on Standards for Communications and Networking (CSCN), November 2022
  • Manos Papoutsakis, Konstantinos Fysarakis, Emmanouil Michalodimitrakis, Eftychia Lakka, Nikolaos Petroulakis, George Spanoudakis and Sotiris Ioannidis: A pattern–driven adaptation in IoT orchestrations to guarantee SPDI properties, in the Model Driver Simulation and Training Environments for CyberSecurity (MSTEC) in conjunction with ESORICS, September 2020
  • Eftychia Lakka, Nikolaos Petroulakis, Emmanouil Michalodimitrakis, Emmanouil Papoutsakis: Validation of Semantic Interoperability between IoT Platforms, Global Internet of Things Summit (GIoTS), June 2020
  • Konstantinos Fysarakis, Emmanouil Papoutsakis, Nikolaos Petroulakis and George Spanoudakis: Towards IoT Orchestrations with Security, Privacy, Dependability and Interoperability Guarantees, IEEE Global Communications Conference (GLOBECOM 2019), Waikoloa, HI, USA, December 2019
  • George Hatzivasilis, Panos Chatziadam, Nikolaos Petroulakis, Sotiris Ioannidis, Matteo Mangini, Christos Kloukinas, Artsiom Yautsiukhin, Michalis Antoniou, Dimitrios G. Katehakis, Marios Panayiotou, Cyber Insurance of Information Systems: Security and Privacy Cyber Insurance Contracts for ICT and Healthcare Organizations, IEEE CAMAD 2019, Limassol, September 2019
  • Eftychia Lakka, Nikolaos E. Petroulakis, George Hatzivasilis, Othonas Soultatos, Manolis Michalodimitrakis, Urszula Rak, Karolina Waledzik, Darko Anicic, Vivek Kulkarni: End-to-End Semantic Interoperability Mechanisms for IoT, IEEE CAMAD 2019, Limassol, September 2019
  • Nikolaos E. Petroulakis, Eftychia Lakka, Ermin Sakic, Vivek Kulkarni, Konstantinos Fysarakis, Iason Somarakis, Jordi Serra, Luis Sanabria-Russo, Danilo Pau, Mirko Falchetto, Domenico Presenza, Tobias Marktscheffel, Kostas Ramantas, Prodromos-Vasileios Mekikis, Lukasz Ciechomski, Karolina Waledzik, SEMIoTICS Architectural Framework: End-to-end Security, Connectivity and Interoperability for Industrial IoT, 2019 Global IoT Summit (GIoTS) 2019
  • Christos Tzagkarakis, Nikolaos E. Petroulakis, Sotiris Ioannidis: Botnet Attack Detection at the IoT Edge Based on Sparse Representation, 2019 Global IoT Summit (GIoTS) 2019
  • Konstantinos Fysarakis, George Spanoudakis, Nikolaos E. Petroulakis, Othonas Soultatos, Arne Bröring, Tobias Marktscheffel: Architectural Patterns for Secure IoT Orchestrations. 2019 Global IoT Summit (GIoTS) 2019
  • Constantinos Marios Angelopoulos, Vasilios Katos, Theodoros Kostoulas, Andreas I. Miaoudakis, Nikolaos E. Petroulakis, George Alexandris, Giorgos Demetriou, Giuditta Morandi, Urszula Rak, Karolina Waledzik, Marios Panayiotou, Christos Iraklis Tsatsoulis: IDEAL-CITIES - A Trustworthy and Sustainable Framework for Circular Smart Cities. 2019 15th IEEE International Conference on Distributed Computing in Sensor Systems (DCOSS) 2019
  • Sofia Alexaki, George Alexandris, Vasilis Katos, N. Ε. Petroulakis: Blockchain-based Electronic Patient Records for Regulated Circular Healthcare JurisdictionsM,. CAMAD 2018
  • Othonas Soultatos, George Spanoudakis, Konstantinos Fysarakis, Ioannis G. Askoxylakis, George Alexandris, Andreas I. Miaoudakis, Nikolaos E. Petroulakis: Towards a Security, Privacy, Dependability, Interoperability Framework for the Internet of Things. CAMAD 2018:
  • Ermin Sakic, Vivek Kulkarni, Vasileios Theodorou, Anton Matsiuk, Simon Kuenzer, Nikolaos E. Petroulakis, Konstantinos Fysarakis, VirtuWind - An SDN- and NFV-Based Architecture for Softwarized Industrial Networks, MMB 2018: 251-261.
  • N. Ε. Petroulakis, G. Spanoudakis, and I. Askoxylakis: Fault Tolerance Using an SDN Pattern Framework Proceedings of the IEEE Globecom, Singapore, 2017.
  • K. Fysarakis, N. Ε. Petroulakis, A. Roos, K. Abbasi, P. Vizarreta, G. Petropoulos, E. Sakic, G. Spanoudakis, and I. Askoxylakis: A Reactive Security Framework for Operational Wind Parks Using Service Function Chaining, In Computers and Communications (ISCC), 2017 IEEE Symposium on, pp. 663-668. IEEE, Heraklion, Greece 2017.
  • N. Ε. Petroulakis, G, Spanoudakis, I. G. Askoxylakis, A. Miaoudakis and A. Traganitis: A Pattern-Based Approach for Designing Reliable Cyber-Physical Systems, Globecom, Sand Diego, USA, 2015
  • I.G. Askoxylakis, Antonis Makrogiannakis, Andreas Miaoudakis, Stefanos Papadakis,N. Ε. Petroulakis, Manolis Surligas, Apostolos Traganitis, Nikolaos Vervelakis: A Rapid Emergency Deployment Mobile Communication Node, in IEEE 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD), Athens, Greece, 1-3 December 2014
  • P. Chatziadam, I. G Askoxylakis, N. E. Petroulakis, A. G Fragkiadakis: Early Warning Intrusion Detection System ", in the 7th International Conference on Trust and Trustworthy Computing (TRUST), Heraklion, Greece, June 2014.
  • A.I. Miaoudakis, N.E. Petroulakis, D. Kastanis, I.G. Askoxylakis: Communications in Emergency and Crisis Situations, in the 2nd International Conference on Distributed, Ambient and Pervasive Interactions, (affiliated with the 16th International Conference on Human-Computer Interaction), Heraklion, Greece, July, 2014.
  • N. E. Petroulakis, I. G. Askoxylakis, A. Traganitis, G. Spanoudakis: A Privacy-Level Model for User Centric Cyber Physical Systems, in the 1st International Conference on Human Aspects of Information Security, Privacy and Trust (affiliated with the 15th International Conference on Human-Computer Interaction), Las Vegas, USA, July 2013.
  • N. E. Petroulakis, E. Z. Tragos, and I. G. Askoxylakis: An Experimental Investigation on Energy Consumption for Secure Life-logging in Smart Environments, in the International Workshop on Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD), Barcelona, Spain, September 2012.
  • N. E. Petroulakis, I. Askoxylakis, and T. Tryfonas: Life-logging in Smart Environments: Challenges and Security Threats, in the 2012 ICC Workshop on Convergence among Heterogeneous Wireless Systems in Future Internet (ConWire), Ottava, Canada, June 2012.
  • A. Fragkiadakis, V.A. Siris, N. Petroulakis: Anomaly-based intrusion detection algorithms for wireless networks, in the 8th International Conference on Wired/Wireless Internet Communications 2010, Lulea, Sweden, June 2010.
  • Nikolaos Petroulakis, Manolis Delakis, Manolis Genetzakis, Theodoros Dionysiou, Stefanos Papadakis, Vasilios A. Siris: Demonstration of Channel Assignment in a Wireless Metropolitan MESH Network, in 10th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM 2009), Kos, Greece, June 2009.
  • Nikolaos Petroulakis and Vasilios A. Siris: Real-Time Collection of Electromagnetic Field Measurements using a Metropolitan Wireless Mesh Network, in the 12th Pan-Hellenic Conference in Informatics (PCI 2008), Samos, Greece, August 2008.
  • M.Delakis, K. Mathioudakis, N. Petroulakis, V. A. Siris: Experiences and Investigations with Heraklion MESH: An experimental Metropolitan Multi-Radio Mesh Network, in the 4th Int'l Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TRIDENTCOM 2008), Innsbruck, Austria, March 2008.
  • V. Angelakis, M. Genetzakis, N. Kossifidis, K. Mathioudakis, M. Ntelakis, S. Papadakis, N. Petroulakis, V.A. Siris: Heraklion MESH: An Experimental Metropolitan Multi-Radio Mesh Network, in the 2nd ACM Int'l Workshop on Wireless Network Testbeds, Experimental evaluation and CHaracterization (WiNTECH'07), held in conjunction with ACM MOBICOM'07, Montreal, Canada, September 2007.
  • N. Petroulakis, A. Miaoudakis: An Application of Neural Networks in Market Segmentation, in the 2nd Pan-Hellenic Conference in New Technologies and Marketing (NTM2007), ISBN: 978-960-88785-3-2, Ierapetra Crete, May 2007.

    • Technical Reports and White Papers
  • Konstantinos Fysarakis, Ioannis Askoxylakis, Nikolaos Petroulakis, Florian Zeiger, Vivek Kulkarni, Anton Matsiuk, Simon Kuenzer, Andreas Roos, Xavi Vilajosana: Slicing / Virtualisation and Strong Isolation, in the “5G-PPP Phase 1 Security Landscape White Paper”, produced by the 5G-PPP Security Working Group, June 2017
  • Adrian Belmonte Martin, Louis Marinos, Evangelos Rekleitis, George Spanoudakis, Nikolaos Petroulakis: Threat Landscape and Good Practice Guide for Software Defined Networks/5G, by the European Network and Information Security Agency (ENISA), December 2015
  • Jim Clarke, Marcos Gomez Hidalgo, Antonio Lioy, Milan Petkovic, Claire Vishik, Jeremy Ward, Ioannis Askoxylakis, Elias Tragos, Nikolaos Petroulakis: Consumerization of IT: Risk Mitigation Strategies, Responding to the Emerging Threat Environment, by the European Network and Information Security Agency (ENISA), December 2012

    • Professional Activities

    Conference Organizing Committees
  • Chair of the local arrangements committee of Bio Electromagnetic (BioEM) 2024, June 2024, Chania, Crete
  • Member of the local organizing committee of ENISA-FORTH Summer School on Network & Information Security (NIS) 2008, 2009, 2010, 2011, 2018, 2019
  • Chair of the local organizing committee and web manager of IEEE International Conference World of Wireless, Mobile and Multimedia Wireless Networks (WoWMoM) 2009
  • Member of the local organizing committee of 30th TF-CSIRT meeting hosted by FORTH CERT 2010
  • Chair of the local organizing committee of International Conference on Information Security Theory and Practice (WISTP) 2011, 2013, 2014, 2015, 2016, 2017
  • Chair of the local organizing committee of International Conference on Cryptology and Network Security (CANS) 2014
  • Chair of the local organizing committee International Conference on Trust & Trustworthy Computing (TRUST) 2014, 2015
  • Chair of the local arrangements committee of European Symposium on Research in Computer Security (ESORICS) 2016
  • Co-chair of the local arrangements committee of IEEE International Symposium on Computers and Communications (ISCC) 2017
  • Member of the local organizing committee of International Symposium on Research in Attacks, Intrusions and Defenses (RAID) 2018
  • Chair of special session of Smart End-to-end Massive IoT Interoperability, Connectivity and Security on IEEE Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD), 2018
  • Chair of special session Security & Privacy for Intelligent, 5G-enabled IoT Ecosystems on IEEE Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD), 2019

    • Tecnical Program Committees
  • IEEE International Conference on Communications (ICC) 2020, 2021, 2022, 2023
  • IEEE International Mediterranean Conference on Communications and Networking (Medicon) 2023
  • IEEE Global Communications Conference (GLOBECOM) 2021, 2022
  • IEEE Conference on Standards for Communications and Networking (CSCN) 2021, 2022
  • International Workshop on Smart Circular Economy (SmaCE) 2019, 2020, 2021
  • International Workshop on Emerging Network Security (ENS 2021)
  • Conference on Availability, Reliability and Security (ARES) 2020, 2021
  • Eclipse Security Artificial Intelligence and Modeling for the Next Generation Internet of Things (SAM IoT) 2020
  • International Workshop on 5G Networks Security (5G-NS) 2020
  • International Workshop on Security and Trust Management (STM) 2020
  • International Workshop on Internet of Things Security and Privacy (WISP) 2019, 2020
  • IEEE International Workshop on Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD) 2018, 2019
  • IEEE International Symposium on Computers and Communications (ISCC) 2017, 2018
  • IEEE Global IoT Summit (GIoTS) 2019
  • IEEE Student Conference on Research and Development, 2012

    • Peer Review Journal Activities
  • IEEE Transaction on Industrial Informatics
  • IEEE Journal on Selected Area in Communications (JSAC)
  • IEEE Systems Journal
  • IEEE Vehicular Technology Magazine (VM)
  • IEEE Transaction of Green Communications and Networking
  • IEEE Access
  • Elsevier Future Generation Computer Systems (FGCS)
  • Wiley Security and Communication Networks Journal (SCT)
  • Elsevier Information Security Technical Report (ISTR)

    • Peer Review Conference and Workshop Activities
  • Applied Cryptography and Network Security (ACNS)
  • IEEE Global Communications Conference (GLOBECOM)
  • IEEE International Conference on Communications (ICC)
  • ACM Cloud Computing Security Workshop (CCSW)
  • USENIX Security Symposium
  • IEEE Conference on Standards for Communications and Networking (CSCN)
  • International Conference on Cryptology and Network Security (CANS)
  • European Symposium on Research in Computer Security (ESORICS)
  • IEEE Symposium on Computers and Communications (ISCC)
  • International Workshop on Smart Circular Economy (SmaCE)
  • Availability, Reliability and Security (ARES)
  • Annual Privacy Forum 2021 (APF)
  • International Workshop on Security and Trust Management (STM)
  • Eclipse Conference on Security Artificial Intelligence and Modeling for the Next Generation Internet of Things (SAM IoT)
  • IEEE International Conference on Cloud Computing (CLOUD)
  • IEEE International Workshop on Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD)
  • International Workshop on Decentralized IoT Systems and Security (DIISS)
  • IEEE Global IoT Summit (GIoTS)
  • International Conference on Innovation in Clouds, Internet and Networks (ICIN)
  • International Conference on Computing, Networking and Communications (ICNC)
  • IEEE Consumer Communications and Networking Conference (CCNC)
  • IEEE International Conference Service-Oriented Computing (ICSOC)
  • International Symposium on Security in Computing and Communications (SSCC)
  • International Conference on Advance Computing Communications and Informatics (ICACCI)
  • International Symposium on Wireless Personal Multimedia Communications (WPMC)
  • Information Conference Security Theory and Practices (WISTP)
  • IEEE International Symposium on Personal Indoor Mobile Radio Communications (PIMRC)

    • Contact

    npetro "at" ics "dot" forth "dot" gr
    Telecommunications and Networks Lab
    Institute of Computer Science
    Foundation for Research and Technology - Hellas (FORTH)
    N. Plastira 100
    Vassilika Vouton,
    GR-700 13 Heraklion,
    Crete, Greece
    PGP 482F 2386 B0A7 4AEA 7ACB FCAB B32D 7434 778F 095E
    Tel: +30 2810 39 1678
    Fax +30-281-0391601