George S. Tombras

91 papers B 9C 13Journal 47Unranked 21
YearRankTypeTitle / Venue / Authors
2025 C conf
The Universe for All: Hands-On Modern Physics for STEM Educators.
EDUCON
Tina P. Nantsou, S. Katsanevas, Chrysa Sofianopoulou, N. Tracas, George S. Tombras, Andromachi Tsirou
2024 C conf
Investigating Factors Contributing to Student Dropout in a STEM MOOC.
EDUCON
Tina P. Nantsou, Hector E. Nistazakis, George S. Tombras
2024 J jnl
Variable Splitting and Fusing for Image Phase Retrieval.
J. Imaging
Petros Nyfantis, Pablo Ruiz Matarán, Hector E. Nistazakis, George S. Tombras, Aggelos K. Katsaggelos
2022 C conf
Hands-on Experiments in Electricity for Physics Teachers and Students.
EDUCON
Tina P. Nantsou, George S. Tombras
2022 C conf
Hands-on Physics Experiments for K-6 Teachers at CERN.
EDUCON
Tina P. Nantsou, George S. Tombras
2022 J jnl
High School Students' Difficulties and their Causes due to the Electromotive Force, in the Study of Direct Current Simple Electric Circuits.
Int. J. Recent Contributions Eng. Sci. IT
Gerasimos Vavasis, Efstratios C. Kapotis, George S. Tombras
2022 J jnl
Research for a Teaching Approach: An Example of Addressing the High School Students' Conceptual and Reasoning Difficulties in the Study of Direct Current Simple Electric Circuits.
Int. J. Recent Contributions Eng. Sci. IT
Gerasimos Vavasis, Efstratios C. Kapotis, George S. Tombras
2022 C conf
STEM Lab on Climate Change with Simple Hands-on Experiments.
EDUCON
Tina P. Nantsou, George S. Tombras
2021 C conf
A Lab of Hands-on STEM Experiments for Primary Teachers at CERN.
EDUCON
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
2021 J jnl
A Physics and Engineering Lab for Primary Teachers at CERN.
Int. J. Recent Contributions Eng. Sci. IT
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
2021 — conf
Block Error Performance of PAM or PPM SIMO FSO Links over Strong Turbulence Channels.
MOCAST
Nikolaos A. Androutsos, Hector E. Nistazakis, A. N. Stassinakis, E. V. Chatzikontis, Andreas D. Tsigopoulos, Evgenia Roditi, George S. Tombras
2021 C conf
Greek MOOC of Experiments with Simple Materials for Students Generates Significant Findings for Teachers and Physics Education.
EDUCON
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
2021 — conf
On the BER Performance of OOK FSO Links with Receivers' Diversity and Time Jitter over Strong Turbulence Channels.
MOCAST
Panagiotis J. Gripeos, Hector E. Nistazakis, Evgenia Roditi, George D. Roumelas, George S. Tombras, Christos K. Volos
2021 J jnl
Α dual-hop equivalent structure of a generalised multi-hop free-space optics network.
IET Commun.
Nikolaos A. Androutsos, Hector E. Nistazakis, Harilaos G. Sandalidis, Erich Leitgeb, George S. Tombras
2020 — conf
A Chaotic Circuit with Bi-Color LED as a Nonlinear Element.
MOCAST
Aggelos Giakoumis, Nikolaos A. Androutsos, Christos K. Volos, Lazaros Moysis, Hector E. Nistazakis, George S. Tombras
2020 — conf
An Empirical Expression for Attenuation Coefficient Evaluation of FSO Links During Night-Time Over Maritime Area of Piraeus Port in Greece.
MOCAST
A. N. Stassinakis, Hector E. Nistazakis, E. V. Chatzikontis, George D. Roumelas, George S. Tombras, Antreas D. Tsigopoulos, Gratchia Mkrttchian
2020 C conf
Learning-by-Doing as an Educational Method of Conducting Experiments in Electronic Physics.
EDUCON
Tina P. Nantsou, Ghassan Frache, Efstratios C. Kapotis, Hector E. Nistazakis, George S. Tombras
2020 — conf
Outage Probability Estimation for a Multi-hop Terrestrial FSO Link Simplified to a Dual-hop Scheme.
MOCAST
Nikolaos A. Androutsos, Hector E. Nistazakis, Kyriakos N. Manganaris, George S. Tombras, Erich Leitgeb, Christos K. Volos
2019 — conf
DF Relayed QAM or DBPSK FSO Links with Generalized Pointing Errors Over Mixture Gamma Turbulence Channels.
MOCAST
Nikolaos A. Androutsos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Antreas D. Tsigopoulos
2019 J jnl
Experimental Implementation and Theoretical Investigation of a Vanadium Dioxide Optical Filter for Bit Error Rate Enhancement of Enhanced Space Shift Keying Visible Light Communication Systems.
Comput.
Dimitra K. Manousou, Argyris N. Stassinakis, Emmanuel Syskakis, Hector E. Nistazakis, Spiros Gardelis, George S. Tombras
2019 — conf
On the use of Diversity in Transdermal Optical Wireless Links with Nonzero Boresight Pointing Errors for Outage Performance Estimation.
MOCAST
George K. Varotsos, Hector E. Nistazakis, George S. Tombras, Konstantinos Aidinis, Fadi Jaber, K. K. Mujeeb Rahman
2019 C conf
Pedagogical Approaches to 21st Century Learning: A Model to Prepare Learners for 21
EDUCON
Ghassan Frache, George S. Tombras, Hector E. Nistazakis, Natoya Thompson
2019 J jnl
Performance Analysis of Hard-Switching Based Hybrid FSO/RF System over Turbulence Channels.
Comput.
Hira Khalid, Sajid Sheikh Muhammad, Hector E. Nistazakis, George S. Tombras
2019 — conf
Performance of Underwater Wireless Optical Link Under Weak Turbulence and Pointing Errors Using Heterodyne QAM Technique.
ONDM
Argyris N. Stassinakis, Hector E. Nistazakis, George K. Varotsos, George S. Tombras
2019 C conf
Research and Categorization of Conceptual Difficulties in Electricity's Concepts and Basic Laws.
EDUCON
Ghassan Frache, Gerasimos Vavasis, Gratchia Mkrttchian, K. Stavropoulos, Efstratios C. Kapotis, Hector E. Nistazakis, George S. Tombras
2019 J jnl
SIMO subcarrier PSK FSO links with phase noise and non-zero boresight pointing errors over turbulence channels.
IET Commun.
George K. Varotsos, Hector E. Nistazakis, Wilfried Gappmair, Harilaos G. Sandalidis, George S. Tombras
2019 J jnl
Serial DF Relayed FSO Links over Mixture Gamma Turbulence Channels and Nonzero Boresight Spatial Jitter.
Comput.
Nikolaos A. Androutsos, Hector E. Nistazakis, Hira Khalid, Sajid Sheikh Muhammad, George S. Tombras
2019 C conf
The Use of Technology to Support Learning at Western Region Colleges, UAE.
EDUCON
Ghassan Frache, George S. Tombras, Kostas Stavropoulos, Gratchia Mkrttchian
2019 — conf
Triple Hybrid Terresstrial FSO/RF/MMW System with Receiver's Diversity.
MOCAST
George D. Roumelas, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Christos K. Volos
2018 J jnl
Analysis, Synchronization and Circuit Design of a 4D Hyperchaotic Hyperjerk System.
Comput.
Peter Daltzis, Christos K. Volos, Hector E. Nistazakis, Antreas D. Tsigopoulos, George S. Tombras
2018 — conf
CDMA radio on FSO links over gamma turbulence channels with nonzero boresight pointing errors.
MOCAST
Michalis P. Ninos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Vasilis Christofilakis, Antreas D. Tsigopoulos
2018 — conf
Estimation of the influence of Vanadium dioxide optical filters at the performance of visible light communication systems.
MOCAST
Dimitra K. Manousou, Argyris N. Stassinakis, Emmanuel Syskakis, Hector E. Nistazakis, George S. Tombras, Christos K. Volos, Antreas D. Tsigopoulos
2018 J jnl
Hyperchaotic Attractor in a Novel Hyperjerk System with Two Nonlinearities.
Circuits Syst. Signal Process.
Peter Daltzis, Sundarapandian Vaidyanathan, Viet-Thanh Pham, Christos K. Volos, Hector E. Nistazakis, George S. Tombras
2018 — conf
Outage performance of mixed, parallel and serial DF relayed FSO links over weak turbulence channels with nonzero boresight pointing errors.
MOCAST
George K. Varotsos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Vasilis Christofilakis, Christos K. Volos
2018 — conf
Robot's path planning based on emulated finite resistive grids.
MOCAST
Eleftherios K. Petavratzis, Christos K. Volos, Ioannis N. Stouboulos, Ioannis M. Kyprianidis, Hector E. Nistazakis, George S. Tombras
2017 J jnl
A Novel Chaotic System without Equilibrium: Dynamics, Synchronization, and Circuit Realization.
Complex.
Ahmad Taher Azar, Christos K. Volos, Nikolaos A. Gerodimos, George S. Tombras, Viet-Thanh Pham, Ahmed G. Radwan, Sundarapandian Vaidyanathan, Adel Ouannas, Jesús M. Muñoz-Pacheco
2017 J jnl
An Accurate Computational Tool for Performance Estimation of FSO Communication Links over Weak to Strong Atmospheric Turbulent Channels.
Comput.
Theodore D. Katsilieris, George P. Latsas, Hector E. Nistazakis, George S. Tombras
2017 — conf
Average error performance in Subcarrier PSK FSO links over weak turbulence channels with spatial jitter and phase noise.
MOCAST
George K. Varotsos, Hector E. Nistazakis, George S. Tombras, Wilfried Gappmair
2017 — conf
Block error rate estimation for wireless optical communication links over strong turbulence channels with pointing errors.
MOCAST
Michalis P. Ninos, Hector E. Nistazakis, A. N. Stassinakis, George K. Varotsos, George S. Tombras, Christos K. Volos
2017 — conf
DF relayed FSO communication systems with time dispersion over Gamma Gamma turbulence and misalignment.
MOCAST
George K. Varotsos, Hector E. Nistazakis, Michalis P. Ninos, George S. Tombras, Antreas D. Tsigopoulos, Christos K. Volos
2017 J jnl
OFDM RoFSO Links with Relays Over Turbulence Channels and Nonzero Boresight Pointing Errors.
J. Commun.
George K. Varotsos, Hector E. Nistazakis, George S. Tombras
2017 — conf
PSK OFDM optical wireless communication systems with receiver's diversity over gamma-gamma turbulence channels and spatial jitter.
MOCAST
Michalis P. Ninos, Hector E. Nistazakis, George P. Latsas, George S. Tombras, Nikos Konofaos
2017 C conf
Reengineering engineering education: Developing a constructively aligned learning-by-doing pedagogical model for 21st century education.
EDUCON
Ghassan Frache, Hector E. Nistazakis, George S. Tombras
2016 — ch.
Implementation of a Laboratory-Based Educational Tool for Teaching Nonlinear Circuits and Chaos.
Advances and Applications in Chaotic Systems
Aggelos Giakoumis, Christos K. Volos, Ioannis N. Stouboulos, Ioannis M. Kyprianidis, Hector E. Nistazakis, George S. Tombras
2013 J jnl
Capacity Analysis of Dual Amplify-and-Forward Relayed Free-Space Optical Communication Systems Over Turbulence Channels With Pointing Errors.
JOCN
Kostas P. Peppas, Argyris N. Stassinakis, Hector E. Nistazakis, George S. Tombras
2012 J jnl
Average Capacity of Optical Wireless Communication Systems Over I-K Atmospheric Turbulence Channels.
JOCN
Kostas P. Peppas, Argyris N. Stassinakis, George K. Topalis, Hector E. Nistazakis, George S. Tombras
2012 J jnl
Serial relaying communications over generalized-gamma fading channels.
Wirel. Commun. Mob. Comput.
Christos Datsikas, Kostas Peppas, Nikos C. Sagias, George S. Tombras
2011 J jnl
Dual-hop multi-input multi-output relay systems over spatially correlated Nakagami-m fading channels.
IET Commun.
Kostas Peppas, Christos Datsikas, Nikos C. Sagias, George S. Tombras
2011 J jnl
Higher Order Capacity Statistics of Diversity Receivers.
Wirel. Pers. Commun.
Nikos C. Sagias, Fotis I. Lazarakis, Antonis Alexandridis, Kostas Dangakis, George S. Tombras
2010 — conf
Bit Error and Outage Probability of Serial Relaying Communication Systems.
Panhellenic Conference on Informatics
Christos Datsikas, Kostas P. Peppas, Nikos C. Sagias, Nikolaos D. Tselikas, George S. Tombras
2010 J jnl
Dual-hop relaying communications over generalized-K (KG) fading channels.
J. Frankl. Inst.
Kostas P. Peppas, Christos Datsikas, Hector E. Nistazakis, George S. Tombras
2010 J jnl
Dual-hop transmissions with fixed-gain relays over Generalized-Gamma fading channels
CoRR
Kostas P. Peppas, A. Mansour, George S. Tombras
2010 J jnl
Error Rate Performance of Multilevel Signals with Coherent Detection.
IEEE Trans. Commun.
Nikos C. Sagias, Ranjan K. Mallik, George S. Tombras
2010 J jnl
Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels.
JOCN
Christos Datsikas, Kostas P. Peppas, Nikos C. Sagias, George S. Tombras
2009 J jnl
Bayesian and frequentist estimation of the performance of free space optical channels under weak turbulence conditions.
J. Frankl. Inst.
Athanassios Katsis, Hector E. Nistazakis, George S. Tombras
2009 J jnl
Capacity estimation of optical wireless communication systems over moderate to strong turbulence channels.
J. Commun. Networks
Hector E. Nistazakis, George S. Tombras, Antreas D. Tsigopoulos, Evangelia A. Karagianni, Michael E. Fafalios
2009 J jnl
Performance analysis of free-space optical communication systems over atmospheric turbulence channels.
IET Commun.
Hector E. Nistazakis, Theodoros A. Tsiftsis, George S. Tombras
2008 J jnl
Description of a 2-Bit Adaptive Sigma-Delta Modulation System with Minimized Idle Tones.
EURASIP J. Adv. Signal Process.
Evangelos A. Prosalentis, George S. Tombras
2008 B conf
Error Rate Performance of Multilevel Signals with Coherent Detection.
GLOBECOM
Nikos C. Sagias, Ranjan K. Mallik, George S. Tombras
2008 J jnl
Introducing JOUNBO: A New Advanced Online Journal and Newspaper Browser.
J. Multim.
Petros Lalos, George S. Tombras
2008 J jnl
Outage Analysis of Decode-and-Forward Relaying Over Nakagami- Fading Channels.
IEEE Signal Process. Lett.
Nikos C. Sagias, Fotis I. Lazarakis, George S. Tombras, Christos Datsikas
2008 J jnl
Symbol error probability of decode and forward cooperative diversity in Nakagami-
J. Frankl. Inst.
Diomidis S. Michalopoulos, George K. Karagiannidis, George S. Tombras
2007 J jnl
A 2-bit Adaptive Delta Modulation System with Improved Performance.
EURASIP J. Adv. Signal Process.
Evangelos A. Prosalentis, George S. Tombras
2007 B conf
Dual-Hop Relaying Networks over Nakagami-M Fading Channels.
PIMRC
Christos Datsikas, George S. Tombras, Nikos C. Sagias, Fotis I. Lazarakis, George C. Alexandropoulos, Antonis A. Alexandridis, Kostas Dangakis
2007 J jnl
On the cascaded Weibull fading channel model.
J. Frankl. Inst.
Nikos C. Sagias, George S. Tombras
2006 C conf
An approach for efficient design of digital amplifiers.
ISCAS
Nikolaos Vlassopoulos, Dionysios I. Reisis, George Lentaris, George S. Tombras, Evangelos A. Prosalentis, N. Ritas, Konstantinos S. Tsakalis
2006 J jnl
Spectral efficiency of a single-cell multi-carrier DS-CDMA system in Rayleigh fading.
J. Frankl. Inst.
Panagiotis Varzakas, George S. Tombras
2005 J jnl
Average output SINR of equal-gain diversity in correlated Nakagami-m fading with cochannel interference.
IEEE Trans. Wirel. Commun.
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, George S. Tombras, Stavros A. Kotsopoulos
2005 J jnl
Communication Theory Average output SNR of equal-gain diversity receivers over correlative Weibull fading channels.
Eur. Trans. Telecommun.
Dimitris A. Zogas, Nikos C. Sagias, George S. Tombras, George K. Karagiannidis
2005 J jnl
Equal-gain and maximal-ratio combining over nonidentical Weibull fading channels.
IEEE Trans. Wirel. Commun.
George K. Karagiannidis, Dimitris A. Zogas, Nikos C. Sagias, Stavros A. Kotsopoulos, George S. Tombras
2005 J jnl
Memory effects in EM emission during uniaxial deformation of dielectric Crystalline materials.
IEEE Geosci. Remote. Sens. Lett.
Vassilios Hadjicontis, George S. Tombras, Dimitrios Ninos, Clairi Mavromatou
2005 J jnl
New results for the Shannon channel capacity in generalized fading channels.
IEEE Commun. Lett.
Nikos C. Sagias, George S. Tombras, George K. Karagiannidis
2005 J jnl
Spectral efficiency for selection combining RAKE receivers over Weibull fading channels.
J. Frankl. Inst.
Nikos C. Sagias, Panagiotis Varzakas, George S. Tombras, George K. Karagiannidis
2005 J jnl
Spectral efficiency of a cellular MC/DS-CDMA system in Rayleigh fading.
Int. J. Commun. Syst.
Panagiotis Varzakas, George S. Tombras
2004 J jnl
Average channel capacity for generalized-selection combining RAKE receivers.
Eur. Trans. Telecommun.
Nikos C. Sagias, Panagiotis Varzakas, George S. Tombras, George K. Karagiannidis
2004 J jnl
Channel capacity and second-order statistics in Weibull fading.
IEEE Commun. Lett.
Nikos C. Sagias, Dimitris A. Zogas, George K. Karagiannidis, George S. Tombras
2004 — conf
Dual selection diversity over correlated Weibull fading channels.
ICC
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, P. Takis Mathiopoulos, George S. Tombras, Stavros A. Kotsopoulos
2004 J jnl
On the detection of acoustic and electromagnetic signals before fracture of dielectric crystalline materials.
IEEE Geosci. Remote. Sens. Lett.
Dimitrios Ninos, George S. Tombras, Clairi Mavromatou, Vassilios Hadjicontis
2004 J jnl
Performance analysis of dual selection diversity in correlated Weibull fading channels.
IEEE Trans. Commun.
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, P. Takis Mathiopoulos, George S. Tombras
2004 B conf
Second order statistics and channel spectral efficiency for selection diversity receivers in Weibull fading.
PIMRC
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, Panayiotis Takis Mathiopoulos, George S. Tombras, Fotini-Niovi Pavlidou
2001 J jnl
Spectral efficiency for a hybrid DS/FH code-division multiple-access system in cellular mobile radio.
IEEE Trans. Veh. Technol.
Panagiotis Varzakas, George S. Tombras
1998 B conf
Spectral efficiency for FDMA and DS-CDMA in cellular systems.
PIMRC
Panagiotis Varzakas, George S. Tombras
1997 J jnl
Evaluation of a terrain-based point-to-point propagation model in the 900 MHz band.
Int. J. Commun. Syst.
F. Lazarkis, A. A. Alexandris, Kostas Dangakis, Panos Kostarakis, George S. Tombras
1997 J jnl
Spectral efficiency of direct-sequence code-division multiple-access in cellular mobile radio.
Int. J. Commun. Syst.
Panagiotis Varzakas, George S. Tombras
1996 — conf
An alternative two-port feedback analysis approach.
ICECS
Stelios M. Potirakis, Giorgos E. Alexakis, George S. Tombras
1996 — conf
Generalized two-port performance evaluation.
ICECS
Stelios M. Potirakis, Giorgos E. Alexakis, George S. Tombras
1994 B conf
A point-to-point mobile radio prediction model based on effective height estimation for the region of Athens.
PIMRC
Fotis I. Lazarakis, Kostas Dangakis, Antonis A. Alexandridis, George S. Tombras
1994 B conf
Field measurements and coverage prediction model evaluation based on a geographical information system.
PIMRC
Fotis I. Lazarakis, Kostas Dangakis, Antonis A. Alexandridis, George S. Tombras
1994 B conf
System design requirements for mobile communications open to conformance testing.
PIMRC
A. C. Papavramidis, George S. Tombras
1992 B conf
A conformance test system for DECT physical layer.
PIMRC
A. C. Papavramidis, Antonis M. Paschalis, O. Myrtue, Kostas Dangakis, George S. Tombras, Panos Kostarakis
1992 B conf
Development of a conformance test system for ERMES receivers.
PIMRC
Kostas Dangakis, George S. Tombras, Antonis M. Paschalis, A. C. Papavramidis, Panos Kostarakis