issue 3-4

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

20150304-06
A model of a single-phase synchronous generator with rare earth magnets
Nikola Georgiev

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This paper makes a study of a single-phase synchronous 16-pole generator with axial magnetic field and rare earth magnets. A model of the synchronous generator has first been developed, taking into consideration its geometric ...  read more

20150304-05
Algorithms for carrier frequency recovery in DVB−S2 receivers
Lyubomir B. Laskov, Lidia T. Jordanova

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In this paper six algorithm for carrier frequency recovery are examined, namely D&M, L&R, Fitz, M&M, Modified M&M and Kay. A mathematical description of algorithms and expressions for determining the frequency ...  read more

20150304-04
Investigation of intrusion detection and intrusion prevention systems in eHealth hospital network
Maria V. Nenova

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The fast growth of the requirements in the eHealth area leads to the problem of protection of personal data and the need of secure transmission via communication channels. The investigated and proposed in the paper solution ...  read more

20150304-03
Power supply circuits for mobile wireless applications
Tihomir S. Brusev

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Wireless battery-powered portable electronic devices give opportunity to the people to have faster communication with each other. The increased functionality of mobile phones enables large data packages to be transmitted in ...  read more

20150304-02
Energy efficiency of IEEE 802.11 WLANs with adaptive modulation schemes
Kiril M. Kassev

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Energy efficiency of wireless communication systems has recently drawn rising attention due to their widespread deployment. Wireless local area networks (WLANs) are an attractive choice for a broadband wireless connectivity ...  read more