issue 3-4

20140304-07
Neural network based approach for quality improvement of electron beam welding
Elena Koleva, Nikolinka Christova, Georgi Mladenov, Dmitrii Trushnikov, Vladimir Belenkiy

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Neural network models for the dependence of the geometry characteristics of welds from 38Cr2Ni2Mo high-strength steel, obtained at electron beam welding in presence of longitudinal beam deflection oscillations, are estimated. ...  read more

20140304-06
A functional model extension of OMA device management
Ivaylo I. Atanasov, Evelina N. Pencheva

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Machine-to-Machine (M2M) communications allow interworking of smart objects such as sensors, actuators and monitors, and development of innovative applications. Remote entity management provides means of managing M2M device ...  read more

20140304-05
Optimization of the structure and the distribution of the reactive power compensation in the industrial electrical supply systems
Nikolay Matanov

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The compensation of the reactive loads is fundamental for improving the quality of the industrial electrical supply and decreasing the losses of active power in the distribution grids. Regarding energy efficiency, capacitor ...  read more

20140304-04
A linear converter of strain-gauge bridge bidirectional disbalance into frequency deviation
Svilen H. Stoyanov

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The measurement of mechanical force and torque magnitudes by means of strain gauges based on a new method for “transforming resistance into frequency” is the object of investigation in this paper. It presents the development ...  read more

20140304-03
Modelling of step-up DC converter
Vladimir V. Dimitrov, Peter T. Goranov

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In the current paper building on the sound theoretical foundation of state-space methods a model for the boost converter is presented. Replacing some elements in the ideal power convertor with their nonideal equivalent circuits ...  read more

20140304-02
Near-field measurements using low cost equipment for RF device characterization
Radoslav B. Borisov, Kaloyan I. Zlatkov, Plamen I. Dankov

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Near-field electromagnetic scanners are widely used for microwave, antenna and electromagnetic compatibility measurements. The scanner determines the spatial distribution of an electrical quantity provided by a single or multiple ...  read more

20140304-01
Fabrication of flexible hybrid low molecular weight compound/polymer light emitting device by screen printing
Mariya P. Aleksandrova, Irena P. Nestorova

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It is demonstrated successful fabrication of simple bicomponent single layer OLED produced by screen printing. The device exhibits high mechanical stability after 400 cycles of bending. Turn on voltage of 5 V and maximum brightness ...  read more

20150304-full
Issue 3-4, 2015

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 50. No 3-4/2015
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20150304-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Nikolay Krastanov
SSH keys exchange protocol using identity based encryption 2

Kiril M. Kassev
 ...  read more

20160304-full
Issue 3-4, 2016

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 51. No 3-4/2016
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20160304-full

C O N T E N T S

ELECTRONICS

Gergana I. Vacheva, Nikolay L. Hinov
State of the art of structures and main components of hybrid and electric vehicles 2

Tatyana Neycheva, Jecho Kostov
Specific occurrences in DC/DC converters used in flyback mode 11

Stefan Bobev
Ethernet based street lighting control system 16

Siya V. Lozanova, Levon O. Altunyan
Hall sensors action with new interpretation 23

TELECOMMUNICATIONS SCIENCE

Veselin B. Demirev


 ...  read more

20150304-07
Performance evaluation of Internet traffic by network measurements
Georgi P. Georgiev

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A review of the main methods for measurement Internet traffic is made. Some of software platforms for network measurements are discussed. The reasons for the need of measurement and monitoring of traffic in IP-based networks ...  read more