issue 3-4

20200304-full
Issue 3-4, 2020

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 55. No 3-4/2020
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20190304-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE
Takeshi Tanaka, Nobuharu Okamitsu, Takuma Hamada, Kenshi Nishino
 ...  read more

20200304-01
Development of an IoT device using SigFox, ThingSpeak, and MATLAB/Simulink
Takeshi Tanaka, Nobuharu Okamitsu, Takuma Hamada, Kenshi Nishino

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We installed a Sigfox antenna at Hiroshima Institute of Technology and acquired basic environmental data via the Sigfox network. The IoT device created by us comprises Sigfox, ThingSpeak, and MATLAB/Simulink, and this configuration ...  read more

20200304-02
Electroencephalography for TV advertisement decomposition
Georgi Tsenov , Stilyan Georgiev, Stanimir Andonov, Valeri Mladenov

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With the introduction of mobile devices with easy to access high processing power, in the late years is possible to perform analysis of bio signals in real time at any place. Such is the case for electroencephalographic signals ...  read more

20200304-03
A study of the efficiency as a usability characteristic in E-learning environment
Maria Todorova, Lilyana Koleva, Elena Koleva

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The world of technology is changing at an extremely fast pace. Covid-19 has given further impetus to modernization in education, and it seems unlikely that schools and universities will continue to function as they did before ...  read more

20200304-04
Cyberlearning and engineering education – survey
Seferin Mirtchev

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The traditional educational research focuses primarily on students’ test scores or obtaining credits, and the learning scientists often deals with knowledge, skills and competencies. The term “cyberlearning” ...  read more

20190304-full
Issue 3-4, 2019

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 54. No 3-4/2019
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20190304-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Jordan Raychev, Diyana Kinaneva, Georgi Hristov, Plamen Zahariev
Comparative analysis of the possibilities of building a decentralized control plane of a Software Defined Networks 41

Mircho J. Mirchev
Spectra of multilayer networks – mathematical foundations, metrics, spectral properties 49

Seferin Mirtchev, Rossitza Goleva, Dimitar Atamian, Ivan Ganchev


 ...  read more

20190304-06
Simulation of the temperature distribution and modelling of molten pool parameters at electron beam drip melting of copper
Tsvetomira Tsonevska, Elena Koleva, Lilyana Koleva, Georgi Mladenov

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In this article quasi steady-state two-dimensional heat model is implemented for the simulation of the temperature distribution in the cast copper ingots through electron beam drip melting. Regression models are estimated ...  read more

20190304-05
Review of hardware-in-the-loop – a hundred years progress in the pseudo-real testing
Nikolay Brayanov, Anna Stoynova

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In the last two decades, the electronics and mechatronics systems became undividable part of human life. With increasing of the number of application fields and functionalities, they became more complex and a lot more efforts ...  read more

20190304-04
Simple PV battery charger without MPPT based on SEPIC converter
Hristo Antchev, Anton Andonov

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This article describes a specific implementation of a SEPIC converter for charging an accumulator battery from a photovoltaic panel and which is characterized by simple control without MPPT. Here are presented some basic mathematical ...  read more

20190304-03
Analysis of non-preemptive priority single-server queueing systems with peaked traffic flows
Seferin Mirtchev, Rossitza Goleva, Dimitar Atamian, Ivan Ganchev

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In this article, single-server priority queueing systems with a peaked arrival process, generally distributed service time and infinite waiting position is analyzed by using the Polya distribution to describe the peaked traffic ...  read more