volume 51

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

Issue 11-12, 2016


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Challenges for providing security in the Internet of things
Tsvetomir Gyuretsov, Jordan Raychev, Georgi Hristov, Plamen Zahariev

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The cyber security issues and problems worry many developers around the globe. After the Internet of Things (IoT) concepts were announced, many companies around the world have focused their work on the developing of new ways ...  read more

Displacement current and Ampère’s circuital law
Ivan Bozev, Radoslav Borisov

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The existing literature about displacement current, although it is clearly defined, there are not enough publications clarifying its nature. Usually it is assumed that the electrical current is three types: conduction current, ...  read more

Improving the voice traffic in WLAN network
Vladimir Dimitrov

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This article examines the simulation model of a wireless local area network working on IEEE 802.11n standard (2.4 GHz) and a bandwidth of 7.2 Mbps. It explores the transmission of voice traffic encoded with G.711 at 64 kbps ...  read more

QoS Guarantee for cloud based ambient assisted living architecture
Georgi Balabanov

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The concept Ambient Assisted Living (AAL) refers thus to the study and development of intelligent systems to support older people in their everyday life, offering a secure conditions in daily environment preferred by user. ...  read more

IP network link capacity evaluation by Polya/G/1 queue
Seferin Mirtchev

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The IP networks are the most powerful tool for sharing information offering many services and using many technologies. When planning telecommunication networks it is important to determine the link throughput to provide quality ...  read more