Volume 51, Issue 9-10, 2016

Issue 9-10, 2016

ELECTROTECHNICA & ELECTRONICA E+E

Vol. 51. No 9-10/2016
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA

20160910-full

C O N T E N T S

TELECOMMUNICATIONS SCIENCE

Zlatan K. Ganev
Outdoor propagation of signals between wireless sensor nodes 1

Zdravko ...  read more

A study on 3D printing technologies and their applications

3D printing turns digital 3D models into solid objects by building them up in layers. The technology was first invented in the 1980s, and since that time has been used for rapid prototyping. Currently, it is possible to 3D print in ...  read more

Adaptive vector control of permanent magnet synchronous motor

It is considered in this paper an opportunity to develop a permanent magnet synchronous motor (PMSM) vector control system with desired quality. A model reference adaptive control (MRAC) system based on hyper-stability theory is synthesized. ...  read more

Exploration of the possibilities of the variational approach for analysis of transient processes in electric circuits

In this paper the possibilities for application of the variational approach for analysis of transient processes in linear and non-linear electric circuits are presented. It is based on two basic theorems, which were introduced several ...  read more

Conducting experiments using a platform for evaluation and assessment of SDN performance

Software-Defined Networks is a brand new network concept that changes the way networks operate. In order to satisfy the network performance there are some issues that needs to be considered. Finding the best controller location in the ...  read more

Beyond algebraic connectivity of graphs – evaluation of topology, based on spectral clustering

This paper presents a method for graph topology evaluation based on the Spectral graph theory, which is based on the analysis of Eigen values and Eigen vectors of the graph matrices. When doing Spectral graph analysis, the first is ...  read more

Payment of pensions by the ”Bulgarian posts” PLC – monopoly or obligation?

This paper examines the payment of pensions in terms of the monopoly extent, rates of liberalization, competition and EU legislation in the field of services of general economic interest. The necessity of the obligation to pay pensions ...  read more

Outdoor propagation of signals between wireless sensor nodes

In this paper we present outdoor propagation of wireless sensor nodes in different scenarios. We observe some cases in which we measure Received Signal Strength (RSS) and then by calculations we find the Path Loss (PL) of the signal, ...  read more