V
Vasilis Christofilakis
Researcher at University of Ioannina
Publications - 57
Citations - 377
Vasilis Christofilakis is an academic researcher from University of Ioannina. The author has contributed to research in topics: Schumann resonances & Antenna (radio). The author has an hindex of 11, co-authored 49 publications receiving 266 citations. Previous affiliations of Vasilis Christofilakis include National Centre of Scientific Research "Demokritos".
Papers
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Performance of Turbo Coded OFDM Under the Presence of Various Noise Types
TL;DR: In this paper, a turbo coded OFDM scheme using a PCCC technique in the presence of a channel which includes AWGN, phase noise, Rayleigh fading, Rician fading and Doppler shift is presented.
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A Prototype Photoplethysmography Electronic Device that Distinguishes Congestive Heart Failure from Healthy Individuals by Applying Natural Time Analysis
George Baldoumas,Dimitrios Peschos,Giorgos Tatsis,Spyridon K. Chronopoulos,Vasilis Christofilakis,Panos Kostarakis,Panayiotis A. Varotsos,Nicholas V. Sarlis,Efthimios S. Skordas,Aris Bechlioulis,Lampros K. Michalis,Katerina K. Naka +11 more
TL;DR: In this article, a prototype photoplethysmography (PPG) electronic device is presented for the distinction of individuals with congestive heart failure (CHF) from the healthy (H) by applying the concept of Natural Time Analysis (NTA).
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Geometry Aspects and Experimental Results of a Printed Dipole Antenna
TL;DR: Changes in the value of the l parameter in the dipole’s structure affect the form of the corresponding return loss, which provides interesting considerations on affecting design and construction of antenna elements at frequency range of 2.4 GHz.
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Earth-to-Earth Microwave Rain Attenuation Measurements: A Survey On the Recent Literature
Vasilis Christofilakis,Giorgos Tatsis,Spyridon K. Chronopoulos,Alexandros Sakkas,Anastasios Skrivanos,Kostas P. Peppas,Hector E. Nistazakis,Giorgos Baldoumas,Panos Kostarakis +8 more
TL;DR: A literature survey, of the last decade, on the issue of estimating rain with the use of earth-to-earth microwave signal attenuation focusing on measurements from backhaul cellular microwave links and experimental setups is presented.
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Pre-seismic Electromagnetic Perturbations in Two Earthquakes in Northern Greece
Kostas Florios,Kostas Florios,Ioannis Contopoulos,Vasilis Christofilakis,Giorgos Tatsis,Spyridon K. Chronopoulos,Christos Repapis,V. Tritakis +7 more
TL;DR: In this paper, a logit regression model was applied to the data to examine whether ELF perturbations could be considered as precursors of seismic activity, and a simple nonlinear statistical model supported the idea that there is some kind of physical interaction between seismic and atmospheric ELF activities.