issue 9-10

20160910-06
Adaptive vector control of permanent magnet synchronous motor
Emil Marinov, Tsvetomir Todorov, Zhivko Zhekov, Nikolay Petkov

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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 ...  read more

20160910-05
Exploration of the possibilities of the variational approach for analysis of transient processes in electric circuits
Emil Panov, Miroslava Doneva

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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 ...  read more

20160910-04
Conducting experiments using a platform for evaluation and assessment of SDN performance
Diyana Kyuchukova, Georgi Hristov

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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 ...  read more

20160910-03
Beyond algebraic connectivity of graphs – evaluation of topology, based on spectral clustering
Mircho Mirchev

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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 ...  read more

20160910-02
Payment of pensions by the ”Bulgarian posts” PLC – monopoly or obligation?
Zdravko Mihaylov, Valentin Tzenov

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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 ...  read more

20160910-01
Outdoor propagation of signals between wireless sensor nodes
Zlatan Ganev

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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 ...  read more