volume 52

20170102-04
Investigation of indoor wireless communication environment using abstract modelling
Viktor R. Stoynov

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Modern wireless communications are realized to a large extent in closed environments. A serious problem for broadband wireless exchange of data in such an environment is the poor quality of signal transmission due to walls ...  read more

20170102-03
A versatile design proposal for embedding and deembedding AES/EBU-formatted digital audio in an uncompressed SDIformatted digital video signal
Emil E. Vladkov

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Combining serial digital video (SDI) with AES/EBU digital audio signals can significantly simplify interconnection, routing and processing of SDTV uncompressed data streams in the professional studio environment. The goal ...  read more

20170102-02
Telecommunication system for green economy – a survey
Zdravka Tchobanova, Galia Marinova

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The fast telecommunications development raises the question of power consumption in communication systems, as well as its impact on the environment. Another important issue is the electromagnetic pollution due to the use of ...  read more

20170102-01
A platform for evaluation of the unmanned aerial vehicles telemetry protocols and their parameters
Svilen Borisov, Jordan Raychev, Georgi Hristov, Ivan Beloev, Plamen Zahariev

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This article aims to present an analysis on the modern methods and protocols for transmission of telemetry data to a remote location, as well as to provide a general overview of the telemetry technologies used for this purpose. ...  read more

20170304-full
Issue 3-4, 2017

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 52. No 3-4/2017
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20170304-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Georgi Balabanov
Challenges of quality of experience management for cloud based ambient assisted living services and applications 1

Mircho Mirchev, Seferin Mirtchev
Network topology analysis – graph properties that matter 5

ELECTRONICS
Emil N. Kovatchev, Nadezhda L. Evstatieva
Analysis and investigations on a digitally controlled LED buck driver for automotive LED applications 13

Elena G. Koleva, Lilyana S. Koleva, Georgi M. Mladenov


 ...  read more

20170304-05
Conceptualising of smart education
Elena Shoikova, Roumen Nikolov, Eugenia Kovatcheva

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Smart education, a concept that describes learning in digital age, has gained increased attention. Broadly defined, smart learning environments represent a new wave of educational systems, involving an effective and efficient ...  read more

20170304-04
Model-based optimization of electron beam welding for obtaining defect-free welds
Elena Koleva, Lilyana Koleva, Georgi Mladenov

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The optimization of welds obtained by electron beam welding is a multi-criterial task, involving the requirements for the geometrical characteristics of the welds, together with the fulfilment of the requirements for lack ...  read more

20170304-03
Analysis and investigations on a digitally controlled LED buck driver for automotive LED applications
Emil N. Kovatchev, Nadezhda L. Evstatieva

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This article presents a configurable constant current LED driver with DSP digital control. A novel, cost-effective high-side current sensing circuit provides feedback signal, proportional to the average LED current. A fast ...  read more

20170304-02
Network topology analysis – graph properties that matter
Mircho Mirchev, Seferin Mirtchev

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This article presents correlation between network metrics with graph properties, more specifically spectral graph characteristics. This work is in the foundation of network topology analysis based on the relevant graph representation ...  read more

20170304-01
Challenges of quality of experience management for cloud based ambient assisted living services and applications
Georgi Balabanov

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The aim of the Cloud Based Ambient Assisted Living (CBAAL) refers thus to the study and development of intelligent systems to support independent living of senior citizens, compensating for prevailing age-related physical ...  read more