Конференције / Conference paper

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VIRTUALNA REALNOST - NOVI PRILAZ U PROJEKTOVANJU I PROIZVODNJI
(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2006-03) Gatalo, Ratko; Navalušić, Slobodan; Zeljković, Milan; Milojević, Zoran; Megađa, Ištvan
U radu je, ukratko, prikazan razvoj tehnologije virtualne realnosti, karakteristike različitih sistema i prisutni trendovi u projektovanju proizvoda korišćenjem virtualne realnosti. Pored toga izloženi su i odrerđeni primeri rezultata, ostvarenih na Institutu za proizvodno mašinstvo, Fakulteta tehničkih nauka u Novom Sadu, koji se odnose na vizuelizaciju rada složenih tehnoloških sistema u području proizvodnog mašinstva, kao segmenta ukupne virtualne realnosti.
About Eigen-Problem of Single Photon Hamiltonian
(Institute of Electrical and Electronics Engineers (IEEE), 2008) Delić, N. V.; Pelemiš, S.; Šetrajčić, J. P.
Altered state of consciousness is a consequence of quantum change which is presented by photons. There is not exist adequate theory, to describe this phenomenon. Linearized single photon Hamiltonian is used for the analysis of its features in coordinate systems. It can be concluded that photon behavior is equally determined by its translation characteristics (impulse components) and its rotation characteristics expressed by way of spin operators.
EXPERIMENTAL VERIFICATION OF THE STRESS DISTRIBUTION IN THE CRANE MAST
(Institute of Mechanical Engineering, 2009) Šarenac, Momir; Milutinović, Miroslav; Ličen, Hotimir
Design, Implementation and Simulation of WirelessHart Network
(University of Niš, Faculty of Electronic Engineering, 2009) Kostadinovic, Miroslav; Stojcev, Mile; Bundalo, Dušanka; Bundalo, Zlatko
In this paper has been presented the way of design and implementation of WirelessHart in the work with the modified TrueTime simulator based on the MATLAB/Simulink, which can simulate the regulating and control mechanism in the execution of tasks in real-time systems, networks and dynamic plants. WirelessHart MAC protocol has been designed and implemented with some C++ functions with the suitable MATLAB MEX interfaces. For better understanding of MAC protocol in the work has been implemented the algorithm of pseudo-code.
ANALIZA POUZDANOSTI PODSISTEMA ZA KOPANJE ROTORNOG BAGERA ER - 1250 RELIABILITY ANALYSIS OF BUCKET WHEEL DRIVE ON BUCKET-WHEEL EXCAVAVTOR ER - 1250
(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2010) Trifković, Spasoje; Kraišnik, Milija; Radić, Nebojša
Rad prikazuje izračunavanje pouzdanosti podsistema za kopanje bagera ER – 1250, za vremenski period od 2006. do 2009. godine. Za analizu otkaza korišćene su dvije metode iz teorije pouzdanosti, analiza stabla otkaza (FTA) i EFTES metoda alokacije pouzdanosti iz razloga njihove velike primjenjivosti i upotrebljivosti u analizama svih perioda životnog vijeka. Za realizaciju proračuna razvijen je programski paket za izračunavanje alociranog inteziteta otkaza i pouzdanosti.
Geoecological importance of wetlands transformation into agricultural landscape: example of Pančevački Rit in Serbia
(Athens : World Scientific and Engineering Acad and Soc, 2010) ŠABIĆ, DEJAN; MILINČIĆ, MIROLJUB; PECELJ, MILICA; MANDIĆ, DANIMIR; PECELJ, JELENA; PAVLOVIC, MILA; ZIVKOVIC, DRAGICA; PLAVSA, JOVAN; PECELJ, MILOVAN
Belgrade’s suburban region of the Pančevački Rit (378.6 km2) is located in the southwestern part of Banat, between the Danube and Tamiš rivers. In the past, the Pančevački Rit was typical marsh region, often flooded by rivers Danube and Tamiš. Some areas of Pančevački Rit were poorly populated, and people lived in pile dwellings (stilt houses), and because of that, village Borča was called Serbian Venice. By the construction of a dam, with an irregular oval shape, around the Pančevački Rit, and melioration systems, in 1934th, this area has undergone landscape geography transformation, and from wetlands was converted to agricultural area, suitable for habitation. Thus, Pančevački Rit has grown in Belgrade’s suburban agricultural region with the largest agricultural conglomerate in Serbia – PIK Belgrade, which supplies Belgrade and its catchment area with agricultural products. In this paper we analyze how new technologies can be used in creation of useful map of landscape geography transformation.
Informational technology in bioclimate analysis of Višegrad for health spa tourism
(2010) PECELJ, MILOVAN; PECELJ, MILICA; MANDIĆ, DANIMIR; PECELJ, JELENA; LUKIĆ, BOGDAN; ŠABIĆ, DEJAN
Previous studies of the helth spa resorts have included just balneo analysis. Spas and health resorts have changed the concept of treatment. The earlier concept was included only long-term treatment and recovering older people and people with diseases. Today, spas and health resorts are based on prevention of illness. They promote service for people of all ages regardless of health status. Natural curative factors such as mineral water, healing mud, healing gases, healing climate (air bath) are important for the treatment of many diseases, recovery after injury or illness, stress, prevention and recreation. This paper try to give a biclimatic analysis of the Višegrad in order to point up recreational value of this therapeutic spa. The subject of this paper is analyses of equivalent temperature, comfort zones and zones of stuffiness that are processed on the basis of the meteorological data for thirty years (1961- 1990) observation in town of Višegrad. . We use software with related database created by authors.
Informational Technology in Bioclimate analysis of Banja Luka for tourism recreation
(2010) PECELJ, MILOVAN; PECELJ, MILICA; MANDIĆ, DANIMIR; PECELJ, JELENA; MILINČIĆ, MIROLJUB; TOŠIĆ, DRAGUTIN
Some types of tourism strongly depend of weather conditions. The aim of the paper is to present how weather variables come together in order to give a climate meaning for tourism. The study has a goal to present a bioclimate analysis of Banja Luka to explore climate-recreation relationship evaluating actual weather conditions. The analysis is based on the human heat balance through the bioclimate model manenvironment heat exchange. The final results show biothermal weather classification for recreation based on the outdoor human heat balance. In this analysis, daily meteorological data were used for two extreme months, January and July 1990 (meteorological station of Banja Luka). We use software with related database created by authors. The idea is to show how weather can be evaluated for recreational needs in the health resorts of Banja Luka surroundings within development of health tourism and spa therapy in Bosnia and Herzegovina.
Eco-climatic Conditions and Biodiversity of Orlovača Cave
(2010) PECELJ, MILOVAN; MANDIĆ, DANIMIR; PECELJ, JELENA; PECELJ, MILICA; STAMENKOVIĆ, SRBOLJUB; DJORDJEVIĆ, DEJAN
Within specific ecological condition of Orlovača cave existed living world failing rich and large in number. They are adapted on absentia light as well as the other characteristic ecology parameter. On an occasion of researching and organizing Orlovača cave, several representative organisms were discovered. They have been convalescent at the Faculty of Biology in Belgrade. Climate parameters like air temperature and air humidity have been measured in some parts of the cave system which has provided a better understanding of microclimatic characteristics of the Orlovača cave as a habitat of troglobites as a specific cave fauna. In addition, Orlovača cave is a paleontological locality of the cave bear. In this research we created web oriented data base for presenting results and teaching students.
Computer Aided Research in Managing Educational Process
(World Scientific and Engineering Academy and Society (WSEAS), 2010) MANDIC, DANIMIR; BANDJUR, VELJKO; LALIC, NENAD; MARTINOVIC, DRAGAN
In the process of action research are trying to gather quantitative facts, as well as other empirical research. This, however, is basic and primary goal of action research. Action research is largely based on qualitative factors. Paradigm of action research is less scientific explanation, a more pedagogical and methodological understanding of the phenomenon that is the subject of research. That does not mean that action research does not strive for the quantitative facts. They tend to rely on quantitative and qualitative facts simultaneously. Action research differs from other types of methodological research and the fact that the researchers considered all the participants of activities (actions) which is the subject of research. Managing changes in education requires particular teachers knowledge. Managing innovations is very complex, because the teacher’s resistance occurs due to insufficient capability and inadequate equipment in schools. Overcoming this problem involves active participation in seminars for teacher training. Development of information technology and constantly innovating educational technology causes changes in the methods and forms of teaching and organization that would be optimal in the era of mass application of Internet and electronic sources of knowledge.
New Technologies in transforming natural hazards to hydro-technical object
(Athens : World Scientific and Engineering Acad and Soc, 2010) PECELJ, MILOVAN; MILINČIĆ, MIROLJUB; MANDIĆ, DANIMIR; PECELJ, MILICA; ŠABIĆ, DEJAN; PECELJ, JELENA; LUKIC, BOGDAN
The biggest and one of the most interesting landslide in the basin of the river Visočica caused arising of natural accumulation of the water Zavojsko lake. To avoid the risks of uncontrolled waters, Zavojsko lake has been drained. in the second stage, during overhaul of landslide, the hydrotechnic measures have been taken at the dam, which was made stronger,strengthened and exceeded. It provided accumulation of Zavojsko lake with the water.Then, 520 hectare of the land have been flooded. Today, priority of the Zavojsko lake is in the water supply of the Pirot and Nis and hydroenergetic supply of the of the Water Power Plant in Pirot with the power of 80 MW which has been used from 1990. In this paper we describe how can new technologies be used in creating usefull hydro-technical objects
Planning and Management of WirelessHart Network
(Institute of Electrical and Electronics Engineers (IEEE), 2010) Kostadinović, Miroslav; Bundalo, Dušanka; Bundalo, Zlatko
Wireless networks are very often used in the process industry. One of such networks is the WirelessHart network. The planning and management of the WirelessHart network in the process industry is considered and described in this paper. In order to analyze behavior of the WirelessHart network in the process industry in the paper are first described devices that are used in the network, the gateway and the transmitters. Then the results of simulation for planning and managing of execution of the communication in the network using AMS Wireless Configurator and SNAP-ON application are presented.
Bioclimatic Assessment of Weather Condition for Recreation in Health Resorts
(Athens : World Scientific and Engineering Acad and Soc, 2010) PECELJ, MILOVAN; PECELJ, MILICA; PECELJ, JELENA; VUJADINOVIĆ, SNEŽANA; ŠEĆEROV, VELIMIR; ŠABIĆ, DEJAN; GAJIC, MIRA; MILINCIC, MIROLJUB
The atmosphere is part of the environment in which the human body constantly seeks balance with the external environment. The reaction of an organism is a response to various physics and chemical processes in the atmosphere. By analyzing these aspects of environment, relevant to health, there is variety of complex effects presented with the bioclimatological indices. One of those indices is humidex used to describe how hot the weather feels to the average person by combining heat and humidity. The aim of the paper is to present how weather variables come together in order to give a elementary climate meaning for recreation within the health tourism. In this analysis, daily meteorological data were used for two extreme warm months, July and August (weather station in Banja Luka). The final results show distribution of different degree of comfort caused by actual weather conditions. The idea is to show how weather can be evaluated for recreational needs in the health resorts around the city of Banja Luka.
Improved Auto-tuning PID Controller of Level in Condenser of Turbine in Thermal Power Plant Using Saturation-relay Feedback
(Faculty of Electronic Engineering; Faculty of Mechanical Engineering, University of Niš, 2010) Prodanović, Saša; Nedić, Novak; Filipović, Vojislav
Properly tuned controllers should ensure correct and unobstructed functioning of the system, i.e. process. Using ideal relay as nonlinearity in process of auto-tuning gives significant errors in estimates of the ultimate gain and ultimate period. In this paper mentioned lack is overcomed by introduction saturation relay, where control system of condensate level in condenser of turbine in thermal power plant Gacko is used as a model. Due to the constant striving to reduce energy consumption, above settings are implemented in the system for which is proposed strategy which provides energy savings, i.e. includes frequency regulators.
Simulation model of DC servo motor control
(2010) Kostadinović, Miroslav; Stojčev, Mile; Bundalo, Dušanka; Bundalo, Zlatko
In the paper are explained in details all phases of adjusting TrueTime simulation surrounding necessary for analysis of behavior of WirelessHART protocol implemented on the example of control system with three nodes for control of DC servo motor. At the end of paper are given obtained results of simulation for control and planing of execution tasks in WirelessHART network.
DYNAMICS MODEL AND MONITORING IN ROTATION MACHINES
(Mašinski fakultet, Univerzitet u Zenici, 2010) Antunović, Ranko; Ekinović, Sabahudin; Uctug, Yildirim; Vivancos Calvet, Joan
The digital signal processing based on new microprocessor technology allows us great success in machines protection, with very acceptable economic investments today. Additionally, including vibration-diagnostics monitoring of machines in addition with analytics methods, it is possible monitoring and quantification dynamics parameter of machine. By means analysis dynamics behavior of rotor, it is possible diagnostics defect which relating on rotor and other parts of machine, and solve it. In last time, vibrations analysis and monitoring are become the most wide spread and softest part of machines diagnostics. Detection, identification and removing of problems about work of machine is simpler if we modeling few dynamics solution. When forming model which oriented on discovering defect by means sensors measured vibrations, which almost located in bearings, mathematics model is presented as elastic rotor with concentrated weight. Experimental results from test tables leading company in the world Bentley Nevada Co. USA used as base for development of this model. As note, mathematics model in the most cases based on radial oscillation of rotor and torsion oscillations in someone cases. Torsion vibration are not detect without special sensors even if they are his magnitude near destruction level.
UTICAJ TEMPERATURNOG POLJA NA DINAMIČKO PONAŠANJE ROTORA TURBOGENERATORA
(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2010-03) Antunović, Ranko; Prodanović, Saša
Pri eksploataciji sinhronih generatora veliki dio energije se gubi i pretvara u toplotu. Gubici se sastoje od gubitaka u namotajima statora i rotora, zatim u jezgru i od gubitaka u ležištima i zaptivačima gdje se kinetička energija pretvara u toplotnu. Pri promjeni režima rada generatora, zatim pri neravnomjernom hlađenju po obimu rotora usled različitih mogućih uzroka (greške u obradi, nesimetričnosti i nejednakosti otvora za hlađenje i žljebova za namotaje, prašina, pukotine i dr.) dolazi do formiranja nesimetričnih i nestacionarnih temperaturnih polja po lokaciji i vremenu rada. Usled vrlo malih razlika temperature zbog velike elastičnosti rotora i velikog raspona između ležišta formira se ugib neutralne linije rotora što dovodi do značajnih promjena neuravnoteženosti sistema. Ovako izazvana neuravnoteženost proizvodi dodatnu inercijalnu silu koja u senzorskom odzivu sa sistema značajno mijenja amplitudu i fazu 1X komponente mehaničkih vibracija pri stacionarnom radu sistema. Pošto ove simptome mogu imati i neke druge neispravnosti u sistemu, potrebno je izvršiti i dopunska ispitivanja, kako bi se odredila veličina i uticaj ove pojave na ukupno dinamičko stanje sistema i tako blagovremeno spriječili njeni neželjeni efekti.
VIZUELIZACIJA RADA FLEKSIBILNOG TEHNOLOŠKOG MODULA ZA BRUŠENJE U MATLAB/SIMULINK OKRUŽENJU
(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2010-03) Košarac, Aleksandar; Zeljković, Milan; Požar, Atila
Kako bi se projektovana struktura mogla bolje razumjeti, procijeniti, prostudirati, pogotovo u fazi projektovanja koncepcionog rješenja, kada su najmanji troškovi eventualnih izmjena, tehnlogija virtualne realnosti ima veliki potencijal kao nadopuna mogućnostima računarske grafike i konvencionalnih CAD sistema. U radu je prikazan postupak vizuelizacije i animacije rada fleksibilnog tehnološkog modula (FTM) za obradu brušenjem rotacionih dijelova u MATLAB/SIMULINK okruženju. Kao primjer je prikazan FTM koga sačinjavaju sledeće komponente: brusilica za okruglo brušenje, portalni manipulator, sistemske palete i indikciono vođena kolica. Virtualni model fleksibilnog tehnološkog modula je dobijen eksportovanjem 3D modela razvijenog primjenog programskog sistema CATIA u VRML. VRML model je posredstvom VR toolbox-a povezan sa upravljačkom strukturom koja je razvijena u SIMULINK-u.
INFORMACIONE TEHNOLOGIJE I SAVREMENI TRENDOVI OBLIKOVANJA ORGANIZACIJE
(Elektrotehnički fakultet, Univerzitet istočno Sarajevo, 2011) Medaković, Vlado; Radić, Nebojša; Vasković, Srđan
Cilj ovog rada je da ukaže na nove izazove u modernom korporativnom upravljanju i primjenu informacionih tehnologija kao mogući odgovor u pogledu na visok nivo turbulencija. Pokazalo se da klasična organizacija i upravljanje predstavljaju ograničavajući faktor za primjenu novih tehnologija, naročito informacionih tehnologija i da je neophodno fundamentalno promijeniti korporativni dizajn u cilju postizanja boljih performansi. Kao primjer dat je jedan od novih oblika organizacije, Web Paukova mreža.
ANALIZA NAPONSKOG STANJA KUKE KORIŠĆENJEM MKE
(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2011) Trifković, Spasoje; Radić, Nebojša; Šehovac, Savo; Košarac, Aleksandar; Milutinović, Miroslav
Kuka je dio koji se najviše koristi za vješanje tereta kod dizalica. Težina kuke je teret koji dizalica mora uvijek dizati, čime se smanjuje nosivost i povećava potrebna snaga dizanja. Zbog toga, dimenzije kuke treba da imaju najmanje potrebne vrijednosti, pri propisanom stepenu sigurnosti. U ovom radu je izvršena analiza naponskog stanja kuke na uobičajeni način i uz pomoć računara, koristeći metodu konačnih elemenata (MKE). Uobičajeni način proračuna kuke se sastoji u provjeri napona u vlaknima materijala u pojedinim presjecima. Krivi dio kuke je proračunat na dva načina, približnom i tačnom metodom. U prvom slučaju je kuka posmatrana kao pravi stap ekscentrično opterećen, a u drugom kao krivi štap.

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