issue 11-12

20181112-full
Issue 11-12, 2018

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 53. No 11-12/2018
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20181112-full

C O N T E N T S

ELECTRICAL ENGINEERING

Vikas Gakwad, Angel Tcolov, Ivan Yatchev
 ...  read more

20181112-01
Analysis of typical faults in the real grid of 22 kV Roha town feeder (India)
Vikas Gaikwad, Angel Tcolov, Ivan Yatchev

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The fault analysis and evaluation of fault voltage and current in the power system network is very important for a stable and reliable operation of the power system. In the present paper, a study of various reasons for faults ...  read more

20181112-02
Some features and opportunities for calibration of analyzers of electric power by total harmonic distortion
Plamen Tzvetkov, Krasimir Galabov, Ivan Kodjabashev

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The possibility for evaluation of the quality of electrical energy for the purpose of calibration of analyzers is considered by using a periodic square-wave pulse signal instead of the traditionally used harmonic signals. ...  read more

20181112-03
Hysteresis loss analysis of magnetic materials with data acquisition system
Ivaylo Nedelchev

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Magnetic materials are widespread in many fields of the electronics and electrical engineering. The most of them take place in the constructions of transformers, coil cores, electromagnets, measurement sensors etc. Thus, their ...  read more

20181112-04
Overview of gyrator based Gm-C filters and their applications
Atanas Tanev

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This paper reviews gyrator based Gm-C filters and their characteristics. The most common gyrator based Gm-C filter architecture is described. Different types of gyrator biquad are presented as well as ...  read more

20181112-05
In-flight sensor system for collecting flight information and providing flight safety of unmanned aerial system
Krume Andreev, Rumen Arnaudov, Ivo Dochev

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In the last decade there has been a rapid development of unmanned aerial aviation and various solutions are sought for gathering information from difficult access points or in cases where there is a risk to operators and technology. ...  read more

20181112-06
A remote controlled system implementation for object video monitoring
Ivo Dochev, Liljana Docheva, Maria Pavlova

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In the current article a solution of the problem with information taking from difficult to reach and dangerous earth places is described. The robots will be very useful in this case. In the article hardware part researching ...  read more

20181112-07
CBIR with dual tree complex wavelet transform using maximally flat all-pass filter
Stella Vetova, Ivo Draganov, Ivan Ivanov

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In the following paper linear-phase filters for Dual-Tree Complex Wavelet Transform implementation based on all-pass filter synthesis with maximally flat characteristics is proposed. This transform is a part of already presented ...  read more

20181112-08
Construction of a preliminary educational system for file backup system using secret sharing technique
Takeshi Tanaka, Nobuharu Okamitsu, Noriyuki Yamada, Toyoharu Takemoto, Katia Vutova

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Information-Technology Promotion Agency points out Ransomware as the second-ranked damage to organizations as well as individuals in “10 Major Security Threats 2017”. Information is stored in three data files separately ...  read more

20141112-full
Issue 11-12, 2014

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 49. No 11-12/2014
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20141112-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Marin V. Nedelchev, Ilia G. Iliev
Synthesis of microstrip filters based on miniaturized hexagonal resonators 2

Kalin L. Dimitrov, Lidia T. Jordanova, Tsvetan A. Mitsev
Computer simulation of distortions in optical fiber for CATV systems 9

Tsvetan A. Mitsev, Nikolay K. Kolev
Optimal divergence of laser beam in optical wireless communication systems 15

Lidia T. Jordanova, Dobri M. Dobrev
Transmission quality assurance in the design of HFC television network 21

Todor D. Tsvetkov, Ilia G. Iliev

 ...  read more