Elektrotehnicki Fakultet

Novi Beograd, Serbia

Elektrotehnicki Fakultet

Novi Beograd, Serbia
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Pantelic F.,Elektrotehnicki Fakultet | Prezelj J.,University of Ljubljana
2012 20th Telecommunications Forum, TELFOR 2012 - Proceedings | Year: 2012

This paper deals with the mechanical properties of the double bass and double bass bow. The sound of the instrument, as well as the vibrations of the bow, were recorded while playing. The sound was recorded with measuring microphone positioned in front of the instrument, while the sensor, placed on the bow's stick, registered its vibrations. By observing these signals, from double bass and bow, the correlation between them was determined in order to explain the bow-string mechanism. © 2012 IEEE.


Dakovic M.,Elektrotehnicki Fakultet | Brajovic M.,Elektrotehnicki Fakultet | Thayaparan T.,Radar Applications and Space Technology Defense RandD Canada | Stankovic L.,Elektrotehnicki Fakultet
2012 20th Telecommunications Forum, TELFOR 2012 - Proceedings | Year: 2012

Radar micro-Doppler signatures are important in identification of properties of unknown targets. Many applications in real world scenarios require estimation of micro-Doppler parameters. Micro-Doppler oscillation period is one of its important parameters. A new algorithm for micro-Doppler oscillation period estimation based on time frequency signal analysis is proposed. Its functionality and theoretical considerations are evaluated using synthetic data, and numerical results are presented. © 2012 IEEE.


Iles D.,Hrvatska Agencija Za Hranu Croatian Food Agency | MARTINOVIc G.,Elektrotehnicki fakultet | Kozak D.,Strojarski fakultet U Slavonskom Brodu
Strojarstvo | Year: 2011

Usage of nanotechnology in food with all of its possible different applications has potential to significantly change today's ways of food manufacturing and packaging as well as to alter fundamental functionality of food. Application of nanotechnology in food increases food safety, allows better delivery of new functional ingredients and extends product life. Food nanotechnology implies nanotechnology application in food package manufacturing and nanotechnology application directly to food products. Production of nanopackages implies usage of nanosensors for detection of contaminants and pathogens, nanosensors for product tracking and control, nanoparticles for improvement of mechanical properties and biodisintegration of a package. New food ingredients in food can be delivered by means of colloids, liposomes, nanoemulsions or nanolaminats, thus transforming food products into health preparation or a medicine. Increased research in the field of nanofood application and a possible nanofood mass production can perhaps lead to health risk for consumers; hence it is important to pass new scientifically based regulations which will define usage of food nanotechnology.


Andrejic B.,Elektrotehnicki Fakultet | Ivanis P.,Elektrotehnicki Fakultet
2011 19th Telecommunications Forum, TELFOR 2011 - Proceedings of Papers | Year: 2011

In this paper, software implementation of most commonly used data compression algorithms is described. The application is developed in programming language Delphi 6, it allow testing of Shannon Fano, static and dynamic Huffman as well as Lempel Ziv algorithm. As a result of the application, efficiency and compression level of chosen algorithm is calculated, and comparative analysis of multiple algorithms for the same data sequence is also allowed. User can enter data and read the results using graphic user interface. In order to illustrate the application options, the corresponding numerical results are presented and compared with the results obtained by using commercial data compression tools. © 2011 IEEE.


Janjic M.,Elektrotehnicki Fakultet | Neskovic N.,Elektrotehnicki Fakultet
2013 21st Telecommunications Forum Telfor, TELFOR 2013 - Proceedings of Papers | Year: 2013

In this paper the problem of high Peak-to-Average Power Ratio (PAPR) in OFDM (Orhogonal frequency-division multiplexing) signals is studied. Beside describing three techniques for PAPR reduction, SLM (SeLective Mapping), PTS (Partial Transmit Sequence) and Interleaving, detailed analysis of performances of this techniques for various values of relevant parameters (number of phase sequences, number of interleavers, number of phase factors, number of blocks) depending on applied technique, is carried out, as well as comparison of this techniques, based on Matlab simulation results. © 2013 IEEE.


Jozsa L.,Elektrotehnicki Fakultet | Sljivac D.,Elektrotehnicki Fakultet | Topie D.,Elektrotehnicki Fakultet
Tehnicki Vjesnik | Year: 2010

Two parts of this paper represent a contribution to implementation of a pump-storage hydroelectric power plant stochastic model into a power plant system reliability model. Part II provides the method for determining the probability distribution of required pumping capacity of a pump-storage plant with natural inflow, and then the insertion of pump-storage hydro plants into the reliability model of the entire electrical energy production system. The inflow is thereby treated as a random variable, and stochastic modelling relies on the well-known method of constant and variable energy production. The model developed is suitable to create an additional decision-making criterion for studies related to expansion planning strategy of generating capacities in power systems. The stochastic models presentedinthis paper are illustrated bysimple numerical examples.


Tomic J.,Elektrotehnicki Fakultet | Neskovic N.,Elektrotehnicki Fakultet
2011 19th Telecommunications Forum, TELFOR 2011 - Proceedings of Papers | Year: 2011

In this paper we evaluated performances of IEEE 802.11s networks. In that purpose, we simulated competition for the medium based on EDCA (Enhanced Distributed Channel Access) and MCCA (Mesh Coordination Function Coordinated Channel Access) mechanisms, using programming language C. We analysed and presented achieved simulation results (average throughput for different traffic categories and average packet delay) depending on the number of Mesh stations and the MAF (MCCA Access Fraction) values. © 2011 IEEE.


Neskovic N.,Elektrotehnicki Fakultet
2011 19th Telecommunications Forum, TELFOR 2011 - Proceedings of Papers | Year: 2011

This paper presents a comprenhensive analysis of contention-based and contention-free MAC protocols of wireless sensor networks. The protocols are compared in terms of energy efficiency, latency in packet delivery, and control overhead. Simulation results of S-MAC (Sensor-MAC) and T-MAC (Timeout-MAC) protocols show average latency in packet delivery, as well as average consumption per node in certain wireless sensor network. © 2011 IEEE.


JOzsa L.,Elektrotehnicki Fakultet | Sljivac D.,Elektrotehnicki Fakultet | Topic D.,Elektrotehnicki Fakultet
Tehnicki Vjesnik | Year: 2010

Two parts of this paper represent a contribution to the implementation of a pump-storage hydroelectric power plant stochastic model into a power plant system reliability model. After analysis of operation modes of such type of power plants, Part I gives an overview referring to the determination of the probability distribution of variable production when natural hydraulic inflow into the upper storage is exclusively used, the probability distribution of variable production from a pumped-storage drive, as well as the probability distribution of necessary energy of the plant with natural hydraulic inflow. The inflow is thereby treated as a random variable, and stochastic modeling relies on the well-known method of constant and variable energy production. The developed model is suitable for development of an additional determination criterion when it comes to making studies related to planning strategy of production capacities in the power system. The stochastic model presented in the paper is illustrated by a simple numerical example.


Vujovic S.,Elektrotehnicki Fakultet | Dakovic M.,Elektrotehnicki Fakultet | Stankovic L.,Elektrotehnicki Fakultet
2014 22nd Telecommunications Forum, TELFOR 2014 - Proceedings of Papers | Year: 2014

Reconstruction of the sparse signals, performed by two algorithms which belongs to the class of convex optimization algorithms, is considered in this paper. Widely used algorithm implemented by the l1-magic code packet is used as the first algorithm. Its realization is based on the primal dual interior point algorithm for convex optimization. The second considered algorithm also belongs to the convex optimization group of algorithms. It is a recently proposed adaptive step gradient-based algorithm. The reconstruction of missing data is based on the direct adaptation of the signal values by minimizing the concentration/sparsity measure of the signal in the transformation domain, where the signal is sparse. Comparison of these two algorithms is done here. © 2014 IEEE.

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