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Search Results: 1 - 10 of 191545 matches for " Milovanovi? Bratislav D. "
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Report on TELSIKS 2011 Conference
Bratislav Milovanovi
Microwave Review , 2011,
Abstract: Report on the 10th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services - TELSIKS 2011 held in Nis from October 5 to 8, 2011.
Some applications of neural networks in microwave modeling
MilovanoviBratislav D.,Markovi? Vera,Marinkovi? Zlatica D.,Stankovi? Zoran 2
Journal of Automatic Control , 2003, DOI: 10.2298/jac0301039m
Abstract: This paper presents some applications of neural networks in the microwave modeling. The applications are related to modeling of either passive or active structures and devices. Modeling is performed using not only simple multilayer perception network (MLP) but also advanced knowledge based neural network (KBNN) structures.
Scientific and Professional Work of Academician Aleksandar Marin i – Contribution to the Development of Telecommunications
Bratislav Milovanovi,Zoran Stankovi?
Microwave Review , 2012,
Abstract: On the 12th of May 2011, professor Marin i left the scenes of life but deep and indelible traces of his creative work in science and education are still present, with the significance that continues to grow everyday. Contribution of professor Marin i to the development of telecommunications and electrical engineering in general, as well as the international reputation of our scientists, is tremendous. Considering his contribution to the development of the ETRAN Society (expert sections: Antennas and Propagation – AP, Microwave Technique – MT and Telecommunications) and the establishment of the National Society for Microwave Technique, Technology and Systems, a special section devoted to his rich professional and scientific work was held at the ETRAN 2012 Conference, within the MT expert section. This work represents an introduction of the aforementioned section. Here will be given a summary of the most important results in science and education of academician Marin i , a respected professor, great scientists and a highly remarkable man.
Report on the main Chapter activities from September 1, 2010 to August 31, 2011
Bratislav Milovanovi,Zlatica Marinkovi?
Microwave Review , 2011,
Abstract: Report prepared for IEEE MTT-S Region 8 Chapter Chairs’ Meeting,held in Manchester, United Kingdom, in October 2011
Modeling of microwave applicators with an excitation through the wave guide using TLM method
Ran?elovi? Tijana,Jokovi? Jugoslav,MilovanoviBratislav
Serbian Journal of Electrical Engineering , 2005, DOI: 10.2298/sjee0502137r
Abstract: In this paper, a real microwave applicator with a wave guide used to launch the energy from the source into the cavity is analyzed using 3D TLM method. In order to investigate the influence of the positions and number of feed wave guides to the number of the resonant modes inside the cavity, obtained results are compared with analytical results and results obtained by using TLM software with an impulse excitation as well. TLM method is applied to the both empty and loaded rectangular metallic cavity, and a very good agreement between simulated and experimental results is achieved.
Nikola Tesla’s contributions to radio developments
Marin?i? Aleksandar,Civri? Zorica,MilovanoviBratislav
Serbian Journal of Electrical Engineering , 2006, DOI: 10.2298/sjee0603131m
Abstract: nema
Definition of the border between the far and near field zone for printed antenna arrays with high side lobe suppression
Miliji? Marija,Ne?i? Aleksandar,MilovanoviBratislav
Serbian Journal of Electrical Engineering , 2013, DOI: 10.2298/sjee1301113m
Abstract: The paper defines the border between the far and near field zone of printed antenna arrays. The conventional definition has a limited application in side lobe suppression measurements, especially in the case of high side lobe suppression. The paper particularly details the printed antenna array with 8 radiation elements. Its symmetrical tapered feed network with Chebyshev distribution enables side lobe suppression greater than -44 dB in the E-plane. In addition, the influence of tolerances in the standard photolithographic process has been investigated. The expected tolerances in the standard photolithographic process have been assumed with moderate precision in order to estimate the side lobe suppression degradation due to amplitude and phase deviations, as well as deviations to optimized values in radiating element positioning. [Projekat Ministarstva nauke Republike Srbije, br. TR32052]
Application of metamaterials for the microwave antenna realizations
Asenov Tatjana,Don?ov Neboj?a,MilovanoviBratislav
Serbian Journal of Electrical Engineering , 2012, DOI: 10.2298/sjee1201001a
Abstract: In this paper, the application of left-handed metamaterials for the realization of microwave antennas has been considered. Special emphasis is placed on lens antennas based on gradient-index metamaterials, and their advantages and enhanced features in comparison with conventional microwave antennas are highlighted.
On a Higher-Order Nonlinear Difference Equation
Bratislav D. Iri?anin
Abstract and Applied Analysis , 2010, DOI: 10.1155/2010/418273
Abstract: This paper shows that all positive solutions of a higher-order nonlinear difference equation are bounded, extending some recent results in the literature. 1. Introduction There is a considerable interest in studying nonlinear difference equations nowadays; see, for example, [1–40] and numerous references listed therein. The investigation of the higher-order nonlinear difference equation where and , and , , was suggested by Stevi? at numerous talks and in papers (see, e.g., [20, 28, 30, 34–38] and the related references therein). In this paper we show that under some conditions on parameters , and all positive solutions of the difference equation where , are bounded. To do this we modify some methods and ideas from Stevi?'s papers [30, 35–37]. Our motivation stems from these four papers. The reader can find results for some particular cases of (1.2), as well as on some closely related equations treated in, for example, [1, 2, 5–11, 18–20, 26, 30, 33–35, 38, 40]. 2. Main Result Here we investigate the boundedness of the positive solutions to (1.2) for the case The following result completely describes the boundedness of positive solutions to (1.2) in this case. The result is an extension of one of the main results in [35]. Theorem 2.1. Assume, and Then every positive solution of (1.2) is bounded if Proof. First note that from (1.2) it directly follows that Using (1.2), it follows that After steps we obtain the following formula Two subcases can be considered now. Case 1 ( ). If , then by (2.2) equality (2.4) implies that for This means that is a bounded sequence.Case 2 ( ). In this case we have From (2.4) and (1.2) we further obtain for each and every where the sequences satisfy the system and the initial values are given by Note that implies that Assume for every . By a direct calculation it follows that , , which, along with (2.8) implies that are strictly increasing sequences. From system (2.8), we have, If it were , , then there was Clearly is a solution of the equation Since and we see that the function attains its maximum at the point Further, by assumption (2.1) we get which along with (2.13) implies that (2.12) does not have solutions on arriving at a contradiction. This implies that there is a fixed index such that From this, inequality (2.2), and identity (2.7) with , it follows that for . From (2.17) the boundedness of the sequence directly follows, as desired. Acknowledgment The research was partially supported by the Serbian Ministry of Science, through The Mathematical Institute of SASA, Belgrade, Project no. 144013.
Dynamics of a Class of Higher Order Difference Equations
Bratislav D. Iri anin
Discrete Dynamics in Nature and Society , 2007, DOI: 10.1155/2007/73849
Abstract: We prove that all positive solutions of the autonomous difference equation xn=αxn−k/(1
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