Електротехнички факултет [Конференције] / Faculty of Electrical Engineering [Conference paper]
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- СтавкаAn Improved Version of Student Attendance Management System Based on RFID(Faculty of Electrical Engineering, University of East Sarajevo, 2019) Mijić, Danijel; Bjelica, Ognjen; Durutović, Jelena; Ljubojević, MilošStudent attendance registration is one of the routine but time-consuming tasks of teaching staff at higher education institutions. Various technical solutions are implemented to alleviate the administrative burden and partly automate this task. Most of them include the use of one or more of the following - Radio Frequency Identification (RFID) technology, biometric solutions such as fingerprint and face recognition and mobile devices - mostly smartphones. In this paper, we present an improved version of our system based on RFID and some results of its use in a real environment. The main improvements have been made to a hardware component RFID reader and to a web-based application that is used by the faculty staff. Besides the usual features of similar systems related to student attendance, the system also includes features that enable integration with external systems, recording of necessary data regarding the work of teachers in class and generating of periodical reports on their work.
- СтавкаAnalysis of single-phase PLL with novel two-phase generator for gridconnected converters(2011) Lale, Srdjan; Lubura, Slobodan; Šoja, Milomir; Ikić. MarkoIt is very important for proper work of gridconnected converters to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL alorithm that has excellent noise and offset rejection property. The main part of the proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop.
- СтавкаImplementation of CORDIC Algorithm on FPGA Altera Cyclone(2012) Ristović, Milica; Lubura, Slobodan; Jokić, DejanIn paper is presented HDL Code generation of Cordic Algorithm in MATLAB/Simulink, using HDL Code generation tool, and its implementation on FPGA Altera Cyclone, using Altera Quartus II. There are also tested data types which Cordic uses, as well as time which is need for sine or cosine calculation of given angle, depending on these data types. With this information Cordic can be easily implemented in any digital system.
- СтавкаExperimental verification of single-phase PLL with novel two-phase generator for gridconnected converters(2012) Lubura, Slobodan; Šoja, Milomir; Lale, Srđan; Ikić. MarkoFor proper work of grid-connected converters it is important to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL algorithm that has excellent noise and offset rejection property. The main part of proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop. Performances of proposed PLL are verified through experimental results given in this paper.
- СтавкаPrediction and measurement of electromagnetic radiation at Krajina Square in the city of Banja Luka(2013) Medjedovic, Petar S.; Suka, Darko S.This work is only a small part of the research carried out in the project: "Prediction, measurement and analysis of composite electromagnetic (EM) field of artificial radiation sources", funded by the Ministry of Science and Technology of the Republic of Srpska. The main objective of the project is to locate the representative measuring points for future monitoring network for continuous measurements and recordings of maximum levels of EM non-ionizing radiation, in the spreading center of Banja Luka area of about 10km². Regarding that, previously was conducted verification with a software package used for a smaller area, by comparing the predicted and measured values of electromagnetic fields strength. For this purpose the pedestrian zones were treated, which are the surfaces and routes with the largest population flow. This paper gives a brief description of the research of EM radiation levels on the surface of 0.008km² in the frequency range from 50MHz to 3GHz.