Technical Faculty

Zrenjanin, Serbia

Technical Faculty

Zrenjanin, Serbia
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Papic Z.M.,Technical faculty | Stankovic N.,Technical faculty | Papic M.,Technical faculty
Metalurgia International | Year: 2012

Information technologies have brought different researches and explanations about their influence on health conditions of those who spend time in front of computers. This work analyses the health condition of the generations of young people who study with the help of the computer and conditions of those who use those machines at their working places. Ergonomics - science whose job is to ensure more comfortable and more secure work has its many forms in all fields, therefore improving and maintaining efficacy, productivity, safety and health while performing work tasks. This work brings the results of the research conducted in 2009, where 110 people from different firms and facilities in Serbia were tested, as long as 250 pupils from elementary schools. The conclusion is that long term work on computer is not medically safe, but with responsible behavior and proper use of ergonomic devices and tools the users can preserve their health.

Milenkovic D.,Serbian Railways | Adamovic Z.,Technical Faculty | Krstic M.,Serbian Railways | Milutnovic D.,Serbian Railways
Journal of the Balkan Tribological Association | Year: 2013

The paper shows the functioning of rail fastening system on a railway track. The function of rail fastening system is to maintain the required tightening force as long as possible, as well as the required pull-out force of coach screws, which results in strong connections between other elements of rail fasteners and sleepers. Based on the tests conducted in laboratories and in field on pull-out force with a built-in plastic dowel and binder (Sikadur-31), on concrete as well as wooden sleepers, the following can be concluded: the results show that with the increase in friction, the pull-out force goes up significantly when the injected binder has the addition of quartz sand, as well as the increase in reliability of a joint between rails and sleepers with other fastening elements. Unreliable rail and sleeper joint leads to increased wear of other elements in the connection and thus reduces the flexibility and reliability of rail fastening system.

Stokic E.,Clinical Center Vojvodina | Brtka V.,Technical Faculty | Srdic B.,University of Novi Sad
Computers in Biology and Medicine | Year: 2010

This paper aims to investigate possible application of the rough set approach to table-organized data in the medical domain, which reveals some relationships among sagittal abdominal diameter, anthropometric parameters and cardiovascular risk factors. When applied to table-organized data, the methodology based on the rough set theory is capable of producing decision rules in the form of If-Then rules. Such rules are suitable for inspection, examination and further analysis. By examination of the selected 30 decision rules, sagittal abdominal diameter could point out a group of obese and preobese patients with high content of visceral fat with different combination and composition of cardiovascular risk factors. These results suggest that sagittal abdominal diameter could be a clinically useful marker for identification of risk factors, combination and structure of total cardiovascular risk by applying different rules in obese and preobese persons. © 2010 Elsevier Ltd.

Stojkovic S.,Technical Faculty
International Journal of Electrical Engineering Education | Year: 2011

The paper presents a simulation model of the three final spans and one 110/35/10 kV/kV/ kV distribution transformer substation (TS) bay. In order to demonstrate the insulation coordination procedure to students, we used this model to provide simulations of backflash and propagation of travelling waves to substation components. For this purpose, we used ATP-EMTP (Alternative Transients Program) software, which, owing to its user-friendly graphical user interface, can be effectively used for both scientific and educational purposes. Aiming for the modernisation of the Insulation Coordination curriculum, we are proposing modified problem-based learning which combines a classical approach with true problem-based learning (PBL). The pedagogical method and ATP-EMTP simulation model presented in this paper are primarily focused on undergraduate students (the fouryear programme), but can also be appropriate at higher levels of education.

Kutin M.,Institut Gosa | Adamovic Z.,Technical Faculty
Russian Journal of Nondestructive Testing | Year: 2010

The paper shows the results obtained in the comparative testing of the welded joints using conventional methods and thermography. The testing aim, using specimen tension of butt welded joint for S 355J2G3 steel (removed from the parts of lug assembly of dredger anchor steel-wire rope Sch Rs 1760/5 × 32) was to determine the tensile features of welded joint by introducing the load transversally to the welded joint. The temperature changes on the tested sample were continuously recorded by thermography, providing to predict attaining the critical stresses, which cause the appearance of fissures, that is, to define the criteria on determining the maximum sample temperature alteration in the field of the elastic and elastoplastic strains. © Pleiades Publishing, Ltd., 2010.

Krneta R.,Technical Faculty | Damnjanovic D.,Technical Faculty | Dokovic M.,Technical Faculty
SACI 2011 - 6th IEEE International Symposium on Applied Computational Intelligence and Informatics, Proceedings | Year: 2011

Better understanding of the acquired theoretical knowledge in the field of digital signal processing, for their successful use in future engineering practice, is achieved by introducing interactive laboratory experiments in the classroom. In this paper we present realization of LabVIEW virtual interactive DSP experiments and hardware DSP laboratory experiments on the NI-ELVIS II + development platform. These experiments can be used in the DSP lab for visualization of filtering concepts. For the purpose of visualization, LabVIEW filter palette has been used for the procedure of band pass digital filter design and active band pass filter has been realized on the NI-ELVIS II+ developing platform. Theoretical characteristics of active band pass filter validated by measurements on realized hardware model. © 2011 IEEE.

Rankovic A.,Technical Faculty | Saric A.T.,University of Novi Sad
15th International Power Electronics and Motion Control Conference and Exposition, EPE-PEMC 2012 ECCE Europe | Year: 2012

This paper proposes an algorithm for distribution state estimation with included unmonitored (or partially monitored) photovoltaic generation and wind turbine&asynchronous generator based models, as well as distributed loads. These data are treated as pseudo measurements and included in the state estimation with lower weights. Initial state estimations for unmonitored (partially monitored) distributed generation and loads are calculated from the weather forecast data or daily load profiles, respectively. The pseudo measurements are additionally re-adjusted by the optimal load/generation reallocation procedure to fit the real-time measurements inside the weighted least square (WLS) based state estimation algorithm. The results and practical aspects of the proposed methodology are demonstrated on characteristic real-life urban distribution network with 40 buses. © 2012 IEEE.

Papic Z.M.,Technical faculty | Papic M.,Technical faculty | Stankovic N.,Technical faculty
Metalurgia International | Year: 2012

The paper presents the evaluation of knowledge of the subject of computing and informatics of the first year students of Gymnasium high school. The knowledge test was particularly designed for this purpose. The main objective of the research is to determine the level of acquired knowledge of computing and informatics. The research evaluated 362 first grade Gymnasium students from three cities in Serbia: Cacak, Kraljevo and Uzice. As the result of this study, and due to the constant changes in Information Technology (IT), the authors suggest a complete reconstruction of the IT curriculum for the first year of Gymnasium, and an update of the existing curriculum every two to three years.

Petrovic P.B.,Technical Faculty
Measurement Techniques | Year: 2013

A new method of measuring active power and the effective (root mean square) value of alternating signals in half the time required by other existing methods, is proposed. The measurement is made by simple summation of samples of the instantaneous power without adjusting the measurement time depending on the signal frequency. Mathematical modeling enables the accuracy of the proposed algorithm to be estimated. © 2013 Springer Science+Business Media New York.

The estimation of the truncation error in the asynchronous sampling of an ac signal containing sub- and interharmonic components is considered. The expressions derived enable one to choose the optimum method and the necessary number of samples of a complex input signal. The limits of the error of the method of signal processing are determined taking the effect of sampling into account. Mathematical modeling of the procedure for estimating the possible truncation error is carried out. © 2011 Springer Science+Business Media, Inc.

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