Academic research · communications · emerging technology

Researching the next communications frontier.

Ray-Smiths is an academic research team of the University of Ioannina, exploring emerging technologies, architectures and methods that will shape future communication systems.

Explore publications View projects

174Publications listed

2Research projects

5Team members

Opento collaboration

01 / Identity

Who we are

We are an interdisciplinary research team working across communications, networking, security, intelligent systems and experimental platforms. Our aim is to connect rigorous scientific inquiry with deployable ideas.

University of Ioannina / Computer Science Eng. Dept.
Ioannina, Greece

02 / People

The Team

Prof. Christos K. Liaskos

Principal Investigator

Christos Liaskos is an Associate Professor with the CSE Dept., University of Ioannina. He received the Diploma in Electrical and Computer Engineering from the Aristotle University of Thessaloniki (AUTH), Greece in 2004, the MSc degree in Medical Informatics in 2008 from the Medical School, AUTH and the PhD degree in Computer Networking from the Dept. of Informatics, AUTH in 2014.Research interests include next-generation communication systems, network intelligence and emerging radio technologies.

cliaskos@uoi.gr Personal site ↗Scholar · Researchgate · ORCID · FORTH

Dr. Alexandros Papadopoulos

Postdoctoral Researcher

Alexandros Papadopoulos received the M.Eng. Diploma in Electrical and Computer Engineering from the Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece, in 2019, and the Ph.D. degree from the Department of Computer Science and Engineering, University of Ioannina, Ioannina, Greece, in 2026, with a focus on Reconfigurable Intelligent Surfaces and programmable wireless environments. Since 2020, he has been with the Information Technologies Institute of the Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Greece, where he is currently a Research Associate and Wireless Communication Researcher. His research interests include 5G/6G communications, RIS-assisted networks, near-field electromagnetic modeling and jamming detection/mitigation.

a.papadopoulos@uoi.gr Researchgate · Google Scholar · ORCID

Stavros Tsimpoukis

PhD Candidate

Stavros Tsimpoukis received the Diploma degree in Electrical and Computer Engineering from the Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2023. He is currently pursuing the Ph.D. degree with the Department of Computer Science and Engineering, University of Ioannina, Greece. Since 2026, he has been with the Information Technologies Institute of the Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Greece, where he is currently a Research Associate. His current research interests include Reconfigurable Intelligent Surfaces, RF Imaging, and Extended Reality Applications.

s.tsimpoukis@uoi.gr Researchgate · Google Scholar

Sotiris Kopsinos

PhD Candidate

Sotiris Kopsinos received the Diploma degree in Electrical and Computer Engineering from the Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2024. He is currently pursuing the Ph.D. degree with the Department of Computer Science and Engineering, University of Ioannina, Ioannina, Greece. He is also a Research Assistant with the Centre for Research and Technology Hellas/Information Technologies Institute (CERTH/ITI), Thessaloniki, Greece. His research interests include game theory, probability theory, and deep reinforcement learning for cellular and RIS-assisted networks.

s.kopsinos@uoi.gr Researchgate · ORCID

Lazaros Koemtzopoulos

PhD Candidate

Lazaros Koemtzopoulos received the Intergrated Master's Diploma degree in Electrical and Computer Engineering from the Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2021. He is currently pursuing a Ph.D. degree in Wireless Communications using Programmable Wireless Environments at the Department of Computer Science and Engineering, University of Ioannina, Ioannina, Greece. He is also a Research Assistant at the Information Technologies Institute of the Centre for Research and Technology Hellas (CERTH-ITI), Thessaloniki, Greece, where his research focuses on Wireless Communications and Physical Layer Security. His current research interests include Reconfigurable Intelligent Surfaces, Programmable Metasurfaces, Physical Layer Key Generation and Satellite Communications.

l.koemtzopoulos@uoi.gr

Extended team

Students, visitors, alumni & collaborators

Assistant Professor Dimitrios Tyrovolas Univeristy of Peloponnese

Ext. Collaborator

04 / Updates

News

2026-06-05

Best Student Paper Award

"PWE-Assisted 3D Spherical Splatting for Object Composition Visualization Using Detection Transformers" was awarded the best student paper award @ EuCNC'2026! Congrats: Anastasios T. Sotiropoulos; Stavros Tsimpoukis; Dimitrios Tyrovolas; Antonios Lalas; Sotiris Ioannidis; Alexandros I. Papadopoulos

Paper accepted @ Globecom'27

A. Papadopoulos et al., "On the Physics-Aware Active Element Selection for Hybrid RIS Configuration", In IEEE Globecom'27.

2026-06-10

Paper accepted at Elsevier ComNet

S. Tsimpoukis et al., "A novel RF-enabled Non-Destructive Inspection Method through Machine Learning and Programmable Wireless Environments" in Elsevier Computer Networks (2026).

2026-05-01

New UoI - BSc student publication

I. Kokkinis, C. Liaskos, "A CLI-Based Digital Twin Tool for RF-to-Image Reconstruction Using Ray-Tracing and GANs", in IEEE ICT, 2026.

05 / Research portfolio

Projects

closedSept 2024 - Aug 26

AUTOMETA

Autometa, an internal project by FORTH, supported research actions for designing, manufacturing and controlling metasurfaces for 6G vehicular networks.

closedSept-2022 to Dec 2024

WISAR

WISAR, a FORTH Synergy Grant, explored RF imaging techniques leveraging software-defined metasurfaces, in collaboration with the PPM group of FORTH-IESL (https://esperia.iesl.forth.gr/~ppm/).

06 / Network

Affiliations

University of Ioannina

CSE Dept, University of Ioannina / Associate Professor (C. Liaskos)

Website ↗

Foundation for Research and Technology - Hellas (FORTH)

Institute of Computer Science / Associated Researcher (C. Liaskos)

Website ↗

Centre for Research & Technology - Hellas (CERTH)

Information Technologies Institute (Group student members)

Website ↗

03 / Research outputs

Publications

Search instantly across titles, authors, venues, years and keywords.

Keyword search Publication type

2017Patent

Realizing Programmable Wireless Environments through Software-controlled Metasurfaces

Pitsillides, A. and Liaskos, C. and Tsioliaridou, A. and Ioannidis, S. and Akyildiz, I. F.

NotePatent no. US 62/539,831

Researching the next communications frontier.

Who we are

The Team

Prof. Christos K. Liaskos

Dr. Alexandros Papadopoulos

Stavros Tsimpoukis

Sotiris Kopsinos

Lazaros Koemtzopoulos

Students, visitors, alumni & collaborators

News

Best Student Paper Award

Paper accepted @ Globecom'27

Paper accepted at Elsevier ComNet

New UoI - BSc student publication

Projects

AUTOMETA

WISAR

Affiliations

University of Ioannina

Foundation for Research and Technology - Hellas (FORTH)

Centre for Research & Technology - Hellas (CERTH)

Publications

Realizing Programmable Wireless Environments through Software-controlled Metasurfaces

Network traffic engineering based on traversing data rate

Device and method for deterministic packet scheduling

Clustering-driven Wireless Data Broadcasting

Cost-Aware Wireless Data Broadcasting

Towards Realizable, Low-Cost Broadcast Systems for Dynamic Environments

On the Analytical Performance Optimization of Wireless Data Broadcasting

Balancing Wireless Data Broadcasting and Information Hovering for Efficient Information Dissemination

A Holistic Virtual Laboratory on Wireless Communications and Sensor Networks

Entropy-based estimation of client preferences in wireless push systems

Generalizing the Square Root Rule for Optimal Periodic Scheduling in Push-based Wireless Environments

Optimal Periodic Scheduling Under Multimodel Per-Item Constraints in Wireless Systems

Parallel Data Broadcasting for Optimal Client Service Ratio

Broadcast Scheduling with multiple concurrent costs

On the Use of FDTD and Ray-Tracing Schemes in the Nanonetwork Environment

On data compatibility and broadcast stream formation

Computer assisted sound analysis of arteriovenous fistula in hemodialysis patients

A Promise of Realizable, Ultra-Scalable Communications at nano-Scale: A multi-Modal nano-Machine Architecture

Minimal Wireless Broadcast Schedules for Multiobjective Pursuits

Design and Development of Software Defined Metamaterials for Nanonetworks

Fast and Fair Handling of Multimedia CAPTCHA Flows

On the Interplay of Link-Flooding Attacks and Traffic Engineering

Backpressure on the Backbone: A Lightweight, Non-intrusive Traffic Engineering Approach

Service Ratio-Optimal, Content Coherence-Aware Data Push Systems

Lightweight, self-tuning data dissemination for dense nanonetworks

Fast-fair Handling of Flows

Computing and Communications for the Software-Defined Metamaterial Paradigm: A Context Analysis

Packet Routing in 3D Nanonetworks: A Lightweight, Linear-path Scheme

On the Network-layer Modeling and Configuration of Programmable Wireless Environments

Network Topology Effects on the Detectability of Crossfire Attacks

A New Wireless Communication Paradigm through Software-controlled Metasurfaces

Using any Surface to Realize a New Paradigm for Wireless Communications

Improving Networked Music Performance Systems Using Application-Network Collaboration

A Novel Communication Paradigm for High Capacity and Security via Programmable Indoor Wireless Environments in Next Generation Wireless Systems

Fault Adaptive Routing in Metasurface Controller Networks

Exploration of Intercell Wireless Millimeter-Wave Communication in the Landscape of Intelligent Metasurfaces

Wideband perfect absorption polarization insensitive reconfigurable graphene metasurface for THz wireless environment

Impact of Graphene Thickness on EM Modelling of Antenna

Complex Systems: A Communication Networks Perspective Towards 6G

Towards fault adaptive routing in metasurface controller networks

Scalability Analysis of Programmable Metasurfaces for Beam Steering

Immersive Interconnected Virtual and Augmented Reality: A 5G and IoT Perspective

Toward Fault-Tolerant Deadlock-Free Routing in HyperSurface-Embedded Controller Networks

End-to-End Wireless Path Deployment With Intelligent Surfaces Using Interpretable Neural Networks

A multi-functional reconfigurable metasurface: Electromagnetic design accounting for fabrication aspects

Toward Intelligent Metasurfaces: The Progress from Globally Tunable Metasurfaces to Software-Defined Metasurfaces with an Embedded Network of Controllers

The Internet of MetaMaterial Things and their software enablers

Radiation Pattern Prediction for Metasurfaces: A Neural Network Based Approach

Switched-beam Graphene Plasmonic Nanoantenna in the Terahertz Wave Region

Next Generation Connected Materials for Intelligent Energy Propagation in Multiphysics Systems

Realizing Ambient Backscatter Communications with Intelligent Surfaces in 6G Wireless Systems

Workload Characterization and Traffic Analysis for Reconfigurable Intelligent Surfaces within 6G Wireless Systems

On the Distribution of the Sum of Double-Nakagami-m Random Vectors and Application in Randomly Reconfigurable Surfaces

Multi-functional metasurface architecture for amplitude, polarization and wavefront control

Analysis and Evaluation of Fully TCP-compatible Backpressure-driven Traffic Engineering

Software-Defined Reconfigurable Intelligent Surfaces: From Theory to End-to-End Implementation

Performance Analysis of Cascaded Reconfigurable Intelligent Surface Networks

A Scheduling Framework for Performing Resource Slicing with Guarantees in 6G RIS-enabled Smart Radio Environments