George S. Tombras

Publication Activity (10 Years)

Years Active: 1992-2024
Publications (10 Years): 41

Top Topics

Communication Systems

Engineering Education

Top Venues

Int. J. Recent Contributions Eng. Sci. IT

Publications

Tina P. Nantsou, Hector E. Nistazakis, George S. Tombras
Investigating Factors Contributing to Student Dropout in a STEM MOOC. EDUCON (2024)
Gerasimos Vavasis, Efstratios C. Kapotis, George S. Tombras
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 10 (1) (2022)
Gerasimos Vavasis, Efstratios C. Kapotis, George S. Tombras
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 10 (3) (2022)
Tina P. Nantsou, George S. Tombras
Hands-on Physics Experiments for K-6 Teachers at CERN. EDUCON (2022)
Tina P. Nantsou, George S. Tombras
STEM Lab on Climate Change with Simple Hands-on Experiments. EDUCON (2022)
Tina P. Nantsou, George S. Tombras
Hands-on Experiments in Electricity for Physics Teachers and Students. EDUCON (2022)
Nikolaos A. Androutsos, Hector E. Nistazakis, Harilaos G. Sandalidis, Erich Leitgeb, George S. Tombras
Α dual-hop equivalent structure of a generalised multi-hop free-space optics network. IET Commun. 15 (5) (2021)
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
A Lab of Hands-on STEM Experiments for Primary Teachers at CERN. EDUCON (2021)
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
A Physics and Engineering Lab for Primary Teachers at CERN. Int. J. Recent Contributions Eng. Sci. IT 9 (3) (2021)
Panagiotis J. Gripeos, Hector E. Nistazakis, Evgenia Roditi, George D. Roumelas, George S. Tombras, Christos K. Volos
On the BER Performance of OOK FSO Links with Receivers' Diversity and Time Jitter over Strong Turbulence Channels. MOCAST (2021)
Nikolaos A. Androutsos, Hector E. Nistazakis, A. N. Stassinakis, E. V. Chatzikontis, Andreas D. Tsigopoulos, Evgenia Roditi, George S. Tombras
Block Error Performance of PAM or PPM SIMO FSO Links over Strong Turbulence Channels. MOCAST (2021)
Tina P. Nantsou, Efstratios C. Kapotis, George S. Tombras
Greek MOOC of Experiments with Simple Materials for Students Generates Significant Findings for Teachers and Physics Education. EDUCON (2021)
Nikolaos A. Androutsos, Hector E. Nistazakis, K. N. Manganaris, George S. Tombras, Erich Leitgeb, Christos K. Volos
Outage Probability Estimation for a Multi-hop Terrestrial FSO Link Simplified to a Dual-hop Scheme. MOCAST (2020)
T. Nantsou, Ghassan Frache, Efstratios C. Kapotis, Hector E. Nistazakis, George S. Tombras
Learning-by-Doing as an Educational Method of Conducting Experiments in Electronic Physics. EDUCON (2020)
A. N. Stassinakis, Hector E. Nistazakis, E. V. Chatzikontis, George D. Roumelas, George S. Tombras, Antreas D. Tsigopoulos, Gratchia Mkrttchian
An Empirical Expression for Attenuation Coefficient Evaluation of FSO Links During Night-Time Over Maritime Area of Piraeus Port in Greece. MOCAST (2020)
Aggelos Giakoumis, Nikolaos A. Androutsos, Christos K. Volos, Lazaros Moysis, Hector E. Nistazakis, George S. Tombras
A Chaotic Circuit with Bi-Color LED as a Nonlinear Element. MOCAST (2020)
Hira Khalid, Sajid Sheikh Muhammad, Hector E. Nistazakis, George S. Tombras
Performance Analysis of Hard-Switching Based Hybrid FSO/RF System over Turbulence Channels. Comput. 7 (2) (2019)
Nikolaos A. Androutsos, Hector E. Nistazakis, Hira Khalid, Sajid Sheikh Muhammad, George S. Tombras
Serial DF Relayed FSO Links over Mixture Gamma Turbulence Channels and Nonzero Boresight Spatial Jitter. Comput. 7 (3) (2019)
Ghassan Frache, George S. Tombras, Kostas Stavropoulos, Gratchia Mkrttchian
The Use of Technology to Support Learning at Western Region Colleges, UAE. EDUCON (2019)
Ghassan Frache, George S. Tombras, Hector E. Nistazakis, Natoya Thompson
Century Competencies and Skills in Engineering. EDUCON (2019)
Ghassan Frache, G. G. Vavasis, Gratchia Mkrttchian, K. Stavropoulos, Efstratios C. Kapotis, Hector E. Nistazakis, George S. Tombras
Research and Categorization of Conceptual Difficulties in Electricity's Concepts and Basic Laws. EDUCON (2019)
Nikolaos A. Androutsos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Antreas D. Tsigopoulos
DF Relayed QAM or DBPSK FSO Links with Generalized Pointing Errors Over Mixture Gamma Turbulence Channels. MOCAST (2019)
Argyris N. Stassinakis, Hector E. Nistazakis, George K. Varotsos, George S. Tombras
Performance of Underwater Wireless Optical Link Under Weak Turbulence and Pointing Errors Using Heterodyne QAM Technique. ONDM (2019)
Dimitra K. Manousou, Argyris N. Stassinakis, Emmanuel Syskakis, Hector E. Nistazakis, Spiros Gardelis, George S. Tombras
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. 7 (2) (2019)
George D. Roumelas, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Christos K. Volos
Triple Hybrid Terresstrial FSO/RF/MMW System with Receiver's Diversity. MOCAST (2019)
George K. Varotsos, Hector E. Nistazakis, Wilfried Gappmair, Harilaos G. Sandalidis, George S. Tombras
SIMO subcarrier PSK FSO links with phase noise and non-zero boresight pointing errors over turbulence channels. IET Commun. 13 (7) (2019)
George K. Varotsos, Hector E. Nistazakis, George S. Tombras, Konstantinos Aidinis, Fadi Jaber, K. K. Mujeeb Rahman
On the use of Diversity in Transdermal Optical Wireless Links with Nonzero Boresight Pointing Errors for Outage Performance Estimation. MOCAST (2019)
Eleftherios K. Petavratzis, Christos K. Volos, Ioannis N. Stouboulos, Ioannis M. Kyprianidis, Hector E. Nistazakis, George S. Tombras
Robot's path planning based on emulated finite resistive grids. MOCAST (2018)
Michalis P. Ninos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Vasilis Christofilakis, Antreas D. Tsigopoulos
CDMA radio on FSO links over gamma turbulence channels with nonzero boresight pointing errors. MOCAST (2018)
Peter Daltzis, Christos K. Volos, Hector E. Nistazakis, Antreas D. Tsigopoulos, George S. Tombras
Analysis, Synchronization and Circuit Design of a 4D Hyperchaotic Hyperjerk System. Comput. 6 (1) (2018)
George K. Varotsos, Hector E. Nistazakis, A. N. Stassinakis, George S. Tombras, Vasilis Christofilakis, Christos K. Volos
Outage performance of mixed, parallel and serial DF relayed FSO links over weak turbulence channels with nonzero boresight pointing errors. MOCAST (2018)
Dimitra K. Manousou, Argyris N. Stassinakis, Emmanuel Syskakis, Hector E. Nistazakis, George S. Tombras, Christos K. Volos, Antreas D. Tsigopoulos
Estimation of the influence of Vanadium dioxide optical filters at the performance of visible light communication systems. MOCAST (2018)
Peter Daltzis, Sundarapandian Vaidyanathan, Viet-Thanh Pham, Christos K. Volos, Hector E. Nistazakis, George S. Tombras
Hyperchaotic Attractor in a Novel Hyperjerk System with Two Nonlinearities. Circuits Syst. Signal Process. 37 (2) (2018)
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
A Novel Chaotic System without Equilibrium: Dynamics, Synchronization, and Circuit Realization. Complex. 2017 (2017)
Michalis P. Ninos, Hector E. Nistazakis, George P. Latsas, George S. Tombras, Nikos Konofaos
PSK OFDM optical wireless communication systems with receiver's diversity over gamma-gamma turbulence channels and spatial jitter. MOCAST (2017)
Michalis P. Ninos, Hector E. Nistazakis, A. N. Stassinakis, George K. Varotsos, George S. Tombras, Christos K. Volos
Block error rate estimation for wireless optical communication links over strong turbulence channels with pointing errors. MOCAST (2017)
Theodore D. Katsilieris, George P. Latsas, Hector E. Nistazakis, George S. Tombras
An Accurate Computational Tool for Performance Estimation of FSO Communication Links over Weak to Strong Atmospheric Turbulent Channels. Comput. 5 (1) (2017)
George K. Varotsos, Hector E. Nistazakis, Michalis P. Ninos, George S. Tombras, Antreas D. Tsigopoulos, Christos K. Volos
DF relayed FSO communication systems with time dispersion over Gamma Gamma turbulence and misalignment. MOCAST (2017)
George K. Varotsos, Hector E. Nistazakis, George S. Tombras
OFDM RoFSO Links with Relays Over Turbulence Channels and Nonzero Boresight Pointing Errors. J. Commun. 12 (12) (2017)
Ghassan Frache, Hector E. Nistazakis, George S. Tombras
Reengineering engineering education: Developing a constructively aligned learning-by-doing pedagogical model for 21st century education. EDUCON (2017)
George K. Varotsos, Hector E. Nistazakis, George S. Tombras, Wilfried Gappmair
Average error performance in Subcarrier PSK FSO links over weak turbulence channels with spatial jitter and phase noise. MOCAST (2017)
Kostas P. Peppas, Argyris N. Stassinakis, Hector E. Nistazakis, George S. Tombras
Capacity Analysis of Dual Amplify-and-Forward Relayed Free-Space Optical Communication Systems Over Turbulence Channels With Pointing Errors. JOCN 5 (9) (2013)
Kostas P. Peppas, Argyris N. Stassinakis, George K. Topalis, Hector E. Nistazakis, George S. Tombras
Average Capacity of Optical Wireless Communication Systems Over I-K Atmospheric Turbulence Channels. JOCN 4 (12) (2012)
Christos Datsikas, Kostas Peppas, Nikos C. Sagias, George S. Tombras
Serial relaying communications over generalized-gamma fading channels. Wirel. Commun. Mob. Comput. 12 (13) (2012)
Kostas Peppas, Christos Datsikas, Nikos C. Sagias, George S. Tombras
Dual-hop multi-input multi-output relay systems over spatially correlated Nakagami-m fading channels. IET Commun. 5 (15) (2011)
Nikos C. Sagias, Fotis I. Lazarakis, Antonis Alexandridis, Kostas Dangakis, George S. Tombras
Higher Order Capacity Statistics of Diversity Receivers. Wirel. Pers. Commun. 56 (4) (2011)
Christos Datsikas, Kostas P. Peppas, Nikos C. Sagias, George S. Tombras
Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels. JOCN 2 (8) (2010)
K. P. Peppas, A. Mansour, George S. Tombras
Dual-hop transmissions with fixed-gain relays over Generalized-Gamma fading channels CoRR (2010)
Kostas P. Peppas, Christos Datsikas, Hector E. Nistazakis, George S. Tombras
Dual-hop relaying communications over generalized-K (KG) fading channels. J. Frankl. Inst. 347 (9) (2010)
Nikos C. Sagias, Ranjan K. Mallik, George S. Tombras
Error Rate Performance of Multilevel Signals with Coherent Detection. IEEE Trans. Commun. 58 (8) (2010)
Christos Datsikas, Kostas P. Peppas, Nikos C. Sagias, Nikolaos D. Tselikas, George S. Tombras
Bit Error and Outage Probability of Serial Relaying Communication Systems. Panhellenic Conference on Informatics (2010)
Athanassios Katsis, Hector E. Nistazakis, George S. Tombras
Bayesian and frequentist estimation of the performance of free space optical channels under weak turbulence conditions. J. Frankl. Inst. 346 (4) (2009)
Hector E. Nistazakis, George S. Tombras, Antreas D. Tsigopoulos, Evangelia A. Karagianni, Michael E. Fafalios
Capacity estimation of optical wireless communication systems over moderate to strong turbulence channels. J. Commun. Networks 11 (4) (2009)
Hector E. Nistazakis, Theodoros A. Tsiftsis, George S. Tombras
Performance analysis of free-space optical communication systems over atmospheric turbulence channels. IET Commun. 3 (8) (2009)
Nikos C. Sagias, Ranjan K. Mallik, George S. Tombras
Error Rate Performance of Multilevel Signals with Coherent Detection. GLOBECOM (2008)
Petros Lalos, George S. Tombras
Introducing JOUNBO: A New Advanced Online Journal and Newspaper Browser. J. Multim. 3 (4) (2008)
Diomidis S. Michalopoulos, George K. Karagiannidis, George S. Tombras
fading channels. J. Frankl. Inst. 345 (7) (2008)
Nikos C. Sagias, Fotis I. Lazarakis, George S. Tombras, Christos Datsikas
Outage Analysis of Decode-and-Forward Relaying Over Nakagami- Fading Channels. IEEE Signal Process. Lett. 15 (2008)
Evangelos A. Prosalentis, George S. Tombras
Description of a 2-Bit Adaptive Sigma-Delta Modulation System with Minimized Idle Tones. EURASIP J. Adv. Signal Process. 2008 (2008)
Nikos C. Sagias, George S. Tombras
On the cascaded Weibull fading channel model. J. Frankl. Inst. 344 (1) (2007)
Christos Datsikas, George S. Tombras, Nikos C. Sagias, Fotis I. Lazarakis, George C. Alexandropoulos, Antonis A. Alexandridis, Kostas Dangakis
Dual-Hop Relaying Networks over Nakagami-M Fading Channels. PIMRC (2007)
Evangelos A. Prosalentis, George S. Tombras
A 2-bit Adaptive Delta Modulation System with Improved Performance. EURASIP J. Adv. Signal Process. 2007 (2007)
Panagiotis Varzakas, George S. Tombras
Spectral efficiency of a single-cell multi-carrier DS-CDMA system in Rayleigh fading. J. Frankl. Inst. 343 (3) (2006)
Nikolaos Vlassopoulos, Dionysios I. Reisis, George Lentaris, George S. Tombras, Evangelos A. Prosalentis, N. Ritas, Konstantinos S. Tsakalis
An approach for efficient design of digital amplifiers. ISCAS (2006)
Vassilios Hadjicontis, George S. Tombras, Dimitrios Ninos, Clairi Mavromatou
Memory effects in EM emission during uniaxial deformation of dielectric Crystalline materials. IEEE Geosci. Remote. Sens. Lett. 2 (2) (2005)
Nikos C. Sagias, George S. Tombras, George K. Karagiannidis
New results for the Shannon channel capacity in generalized fading channels. IEEE Commun. Lett. 9 (2) (2005)
Panagiotis Varzakas, George S. Tombras
Spectral efficiency of a cellular MC/DS-CDMA system in Rayleigh fading. Int. J. Commun. Syst. 18 (8) (2005)
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, George S. Tombras, Stavros A. Kotsopoulos
Average output SINR of equal-gain diversity in correlated Nakagami-m fading with cochannel interference. IEEE Trans. Wirel. Commun. 4 (4) (2005)
Nikos C. Sagias, Panagiotis Varzakas, George S. Tombras, George K. Karagiannidis
Spectral efficiency for selection combining RAKE receivers over Weibull fading channels. J. Frankl. Inst. 342 (1) (2005)
George K. Karagiannidis, Dimitris A. Zogas, Nikos C. Sagias, Stavros A. Kotsopoulos, George S. Tombras
Equal-gain and maximal-ratio combining over nonidentical Weibull fading channels. IEEE Trans. Wirel. Commun. 4 (3) (2005)
Dimitris A. Zogas, Nikos C. Sagias, George S. Tombras, George K. Karagiannidis
Communication Theory Average output SNR of equal-gain diversity receivers over correlative Weibull fading channels. Eur. Trans. Telecommun. 16 (6) (2005)
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, Panayiotis Takis Mathiopoulos, George S. Tombras, Fotini-Niovi Pavlidou
Second order statistics and channel spectral efficiency for selection diversity receivers in Weibull fading. PIMRC (2004)
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, P. Takis Mathiopoulos, George S. Tombras
Performance analysis of dual selection diversity in correlated Weibull fading channels. IEEE Trans. Commun. 52 (7) (2004)
Nikos C. Sagias, Dimitris A. Zogas, George K. Karagiannidis, George S. Tombras
Channel capacity and second-order statistics in Weibull fading. IEEE Commun. Lett. 8 (6) (2004)
Nikos C. Sagias, Panagiotis Varzakas, George S. Tombras, George K. Karagiannidis
Average channel capacity for generalized-selection combining RAKE receivers. Eur. Trans. Telecommun. 15 (5) (2004)
Dimitrios Ninos, George S. Tombras, Clairi Mavromatou, Vassilios Hadjicontis
On the detection of acoustic and electromagnetic signals before fracture of dielectric crystalline materials. IEEE Geosci. Remote. Sens. Lett. 1 (3) (2004)
Nikos C. Sagias, George K. Karagiannidis, Dimitris A. Zogas, P. Takis Mathiopoulos, George S. Tombras, Stavros A. Kotsopoulos
Dual selection diversity over correlated Weibull fading channels. ICC (2004)
Panagiotis Varzakas, George S. Tombras
Spectral efficiency for a hybrid DS/FH code-division multiple-access system in cellular mobile radio. IEEE Trans. Veh. Technol. 50 (6) (2001)
Panagiotis Varzakas, George S. Tombras
Spectral efficiency for FDMA and DS-CDMA in cellular systems. PIMRC (1998)
Panagiotis Varzakas, George S. Tombras
Spectral efficiency of direct-sequence code-division multiple-access in cellular mobile radio. Int. J. Commun. Syst. 10 (5) (1997)
F. Lazarkis, A. A. Alexandris, Kostas Dangakis, Panos Kostarakis, George S. Tombras
Evaluation of a terrain-based point-to-point propagation model in the 900 MHz band. Int. J. Commun. Syst. 10 (2) (1997)
Stelios M. Potirakis, Giorgos E. Alexakis, George S. Tombras
Generalized two-port performance evaluation. ICECS (1996)
Stelios M. Potirakis, Giorgos E. Alexakis, George S. Tombras
An alternative two-port feedback analysis approach. ICECS (1996)
Fotis I. Lazarakis, Kostas Dangakis, Antonis A. Alexandridis, George S. Tombras
Field measurements and coverage prediction model evaluation based on a geographical information system. PIMRC (1994)
Fotis I. Lazarakis, Kostas Dangakis, Antonis A. Alexandridis, George S. Tombras
A point-to-point mobile radio prediction model based on effective height estimation for the region of Athens. PIMRC (1994)
A. C. Papavramidis, George S. Tombras
System design requirements for mobile communications open to conformance testing. PIMRC (1994)
Kostas Dangakis, George S. Tombras, Antonis M. Paschalis, A. C. Papavramidis, Panos Kostarakis
Development of a conformance test system for ERMES receivers. PIMRC (1992)
A. C. Papavramidis, Antonis M. Paschalis, O. Myrtue, Kostas Dangakis, George S. Tombras, Panos Kostarakis
A conformance test system for DECT physical layer. PIMRC (1992)