152 results on '"Sovilj, Platon"'
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2. Influence of rotational speed on the electrical and mechanical properties of the friction stir spot welded aluminium alloy sheets
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Labus Zlatanovic, Danka, Bergmann, Jean Pierre, Balos, Sebastian, Gräzel, Michael, Pejic, Dragan, Sovilj, Platon, and Goel, Saurav
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- 2022
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3. Application of two-bit dithered Discrete Fourier basis functions in electricity measurement
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Đorđević-Kozarov Jelena, Juhas Atila, Pejić Dragan, Sovilj Platon, and Vujičić Vladimir
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fourier transformation ,basis functions ,dither ,stochastic digital measurement method ,Agriculture - Abstract
The paper defines an algorithm for generating two-bit dithered discrete Fourier basis functions (DDFBF) used in a Stochastic Digital Discrete Fourier Transformation (SDDFT) processor. Based on the theoretical criterion of upper limit precision of norm and orthogonality, the orthonormality of DFT with 32 harmonics is explored by simulation and experimentally. The experiment was detailed and comprehensive, both for norm and for both types of orthogonality. It is performed in 236,8 million points in each of three variants of orthonormality. The matching of theoretical and experimental precision is very acceptable and it can be said with great confidence that the proposed algorithm for generating DDFBF is correct. The DDFBF approach plays a key role in electricity measurement, which is emphasized in the paper.
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- 2021
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4. Stochastic measurement of wind power using a two-bit A/D converter
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Vujicic, Vladimir, Licina, Boris, Pejic, Dragan, Sovilj, Platon, and Radonjic, Aleksandar
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- 2020
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5. TEHNOLOGIJE I PRIMENA SISTEMA ZA PRAĆENJE OČNIH POKRETA
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Nedić, Vesna, primary and Sovilj, Platon, primary
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- 2024
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6. Measurement of wind power and energy using an anemometer without moving parts
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Vujičić Bojan, Ličina Boris, Sovilj Platon, and Vujičić Vladimir
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wind power ,wind energy ,two-bit sdmm ,anemometer with fixed frames ,Agriculture - Abstract
The paper deals with the application of a newly developed anemometer without moving parts. It is digitized and has built-in electronics that convert the vibrations of two aluminum fixed frames into two digital signals: one, which shows the strength (speed absolute value)) of the wind, and the other, which shows its direction. Earlier works have shown that the two-bit stochastic digital measurement method overcomes (eliminates) the problem of the offset of the analog adder. The authors of this paper apply this idea to the digital output of the sensor, where the role of the offset of the analog adder is taken over by the integral nonlinearity of the digital output of the anemometer. The first step in this direction is dithering digitally the sensor output. This principle is presented in detail, as well as a rough estimate of the accuracy gain in measuring wind energy.
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- 2021
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7. Cognitive phenomena measurement with time window-based multispectral brain mapping.
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Petrović, Nikola, Mandić, Sanja, Borojević, Svetlana, Gazivoda, Nemanja, and Sovilj, Platon
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BRAIN mapping ,COGNITIVE testing ,COGNITIVE neuroscience ,PYTHON programming language ,TIME measurements ,MIND-wandering ,COGNITIVE maps (Psychology) - Abstract
BACKGROUND: Cognitive neuroscience experiments require accurate and traceable methods of measuring cognitive phenomena, analyzing and processing data, and validating results, including measurement of impact of such phenomena on brain activity and consciousness. EEG measurement is the most widely used tool for evaluation of the experiment's progress. To extract more information from the EEG signal, continuous innovation is necessary to provide a broader range of information. OBJECTIVE: This paper presents a new tool for measuring and mapping cognitive phenomena using time window-based multispectral brain mapping of electroencephalography (EEG) signals. METHODS: The tool was developed using Python programming language and enables users to create brain maps images for six spectra (Delta, Theta, Alpha, Beta, Gamma, and Mu) of EEG signal. The system can accept an arbitrary number of EEG channels with standardized labels based on the 10–20 system, and users can select the channels, frequency bandwidth, type of signal processing, and time window length to perform the mapping. RESULTS: The key advantage of this tool is its ability to perform short-time brain mapping, which allows for the exploration and measurement of cognitive phenomena. The tool's performance was evaluated through testing on real EEG signals, and results demonstrated its effectiveness in accurately mapping cognitive phenomena. CONCLUSION: The developed tool can be used in various applications, including cognitive neuroscience research and clinical studies. Future work involves optimizing the tool's performance and expanding its capabilities. [ABSTRACT FROM AUTHOR]
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- 2024
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8. Introductory notes to selected papers from the 2022 IMEKO TC4 symposium
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Saliga, Jan, primary, Svatos, Jakub, additional, and Sovilj, Platon, additional
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- 2023
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9. EEG dynamic noise floor measurement with stochastic flash A/D converter
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Urekar, Marjan and Sovilj, Platon
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- 2017
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10. Measurement of definite integral of sinusoidal signal absolute value third power using digital stochastic method
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Beljić Željko, Ličina Boris, Sovilj Platon, Pejić Dragan, Vujičić Vladimir, and Vujičić Bojan
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AD conversion ,digital measurements ,electrical measurements ,probability ,stochastic processes ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
In this paper a special case of digital stochastic measurement of the third power of definite integral of sinusoidal signal’s absolute value, using 2-bit AD converters is presented. This case of digital stochastic method had emerged from the need to measure power and energy of the wind. Power and energy are proportional to the third power of wind speed. Anemometer output signal is sinusoidal. Therefore an integral of the third power of sinusoidal signal is zero. Two approaches are proposed for the third power calculation of the wind speed signal. One approach is to use absolute value of sinusoidal signal (before AD conversion) for which there is no need of multiplier hardware change. The second approach requires small multiplier hardware change, but input signal remains unchanged. For the second approach proposed minimal hardware change was made to calculate absolute value of the result after AD conversion. Simulations have confirmed theoretical analysis. Expected precision of wind energy measurement of proposed device is better than 0,00051% of full scale. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR32019]
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- 2017
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11. Multisensory platform based on NEC protocol
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Novaković Đorđe, Sovilj Platon, and Gazivoda Nemanja
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multisensory platform ,remote control ,NEC protocol ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Multisensory signal acquisition represents one of the main concepts necessary to perform measurements in various industrial and consumer-oriented applications. This paper presents a development platform which provides a data acquisition from multiple sensors. The main module of the platform is the UNIDS-3 development board with PIC18F8520 microcontroller. Data acquisition from the sensors is performed on user demand by remote control. NEC protocol is implemented and IR receiver TSOP31238 is used. The measurement data are sent to a computer, which performs digital data processing, data visualization and data storage. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR32019]
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- 2017
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12. Phase measurement methods based on timer modules
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Mandić, Sanja, primary, Pejić, Dragan, additional, Novaković, Đorđe, additional, Urekar, Marjan, additional, and Sovilj, Platon, additional
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- 2023
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13. Digital Stochastic Measurement and Industry 4.0
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Sovilj, Platon, primary, Pejić, Dragan, additional, Urekar, Marjan, additional, and Mandić, Sanja, additional
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- 2023
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14. Metrology and Capacity Building in Higher Education: Project Knowledge triangle for a low carbon economy (KALCEA)
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Sovilj, Platon, primary, Mandić, Sanja, additional, Pejić, Dragan, additional, Novaković, Đorđe, additional, and Urekar, Marjan, additional
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- 2023
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15. Decoding Cognitive Processes in Arithmetic Tasks: An EEG-Based Convolutional Neural Network Model
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Petrović, Nikola, primary, Spahić, Lemana, additional, Mandić, Sanja, additional, and Sovilj, Platon, additional
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- 2023
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16. Measurement of event-related potentials and placebo
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Sovilj Platon, Ković Vanja, Biro Mikloš, Radak Marin, and Mitrović Zoran
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biomedical measurements ,electroencephalography ,event-related potentials ,cognitive neuroscience ,placebo ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
ERP is common abbreviation for event-related brain potentials, which are measured and used in clinical practice as well as in research practice. Contemporary studies of placebo effect are often based on functional neuromagnetic resonance (fMRI), positron emission tomography (PET), and event related potentials (ERP). This paper considers an ERP instrumentation system used in experimental researches of placebo effect. This instrumentation system can be divided into four modules: electrodes and cables, conditioning module, digital measurement module, and PC module for stimulations, presentations, acquisition and data processing. The experimental oddball paradigm is supported by the software of the instrumentation. [Projekat Ministarstva nauke Republike Srbije, br. TR32019 and Provincial Secretariat for Science and Technological Development of Autonomous Province of Vojvodina (Republic of Serbia) under research grant No. 114-451-2723]
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- 2014
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17. Stochastic two-bit on-line temperature measurement with RTD Pt-100 sensor operating in a nonlinear mode
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Sovilj, Platon, Sovilj, Platon, Vujičić, Bojan, Pejić, Dragan, Radonjić, Aleksandar, Vujičić, Vladimir, Sovilj, Platon, Sovilj, Platon, Vujičić, Bojan, Pejić, Dragan, Radonjić, Aleksandar, and Vujičić, Vladimir
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The paper proposes a method and device for on-line temperature measurement with Pt-100 sensor operating in a nonlinear mode. The sensor measures the temperature in range of 00C to 2000C, whereas the measured data are processed by applying a two-bit stochastic digital measurement method. The proposal is theoretically analyzed and tested experimentally. It is shown that the accuracy of the method depends on the accuracy of the sensor. At a sampling frequency of 1 MHz, the maximum accuracy is reached in 17.5 sec. and is equal to 0.015% of full scale (FS). On the other hand, when the measurement time interval is 0.1 sec. (the shortest measurement interval), the accuracy is equal to 0.1% of FS. Therefore, the proposed device can be used for both calibration and measurement purposes.
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- 2020
18. Kongres metrologa 2022 - Naučni odbor
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Ogrizović, Vukan, Mišković, Zoran, Sovilj, Platon, Damjanović, Srđan, Naumović-Vuković, Dragana, Gabrić, Ognjen, Pejić, Dragan, Urekar, Marjan, Ogrizović, Vukan, Mišković, Zoran, Sovilj, Platon, Damjanović, Srđan, Naumović-Vuković, Dragana, Gabrić, Ognjen, Pejić, Dragan, and Urekar, Marjan
- Abstract
Društvo metrologa je formirano u cilju objedinjavanja aktivnosti svih metrologa, pružanju pomoći prilikom njihovog rada i međusobne razmene iskustava. Misija Društva metrologa je da okuplja i podstiče stručnjake koji se bave metrologijom, ili srodnim disciplinama, da međusobno razvijaju kreativnu inicijativu za njen dalji razvoj i unapređenje, prati razvoj metrologije i ukazuje na tokove, zbivanja i promene u ovoj oblasti i da se povezuje sa sličnim naučnim, stručnim i drugim organizacijama, domaćim ili međunarodnim, radi promocije metrologije. Osnovni ciljevi Društva: Okupljanje stručnjaka iz oblasti metrologije Praćenje razvoja metrologije Priprema standarda od značaja za struku Sarađivanje kod izrade propisa iz oblasti metrologije Izdavanje publikacija i časopisa iz oblasti metrologije Organizovanje simpozijuma o mernoj opremi
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- 2022
19. PRECIZNOST BIOHEMIJSKIH ANALIZATORA I IMUNOANALIZATORA U MEDICINSKIM LABORATORIJAMA
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Lažetić, Ivan, primary and Sovilj, Platon, primary
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- 2022
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20. Measurement of definite integral product of two more signals using two-bit ADCs
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Ličina Boris, Sovilj Platon, and Vujičić Vladimir
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analogue-digital conversion ,dither techniques ,sampling methods ,probability ,statistics ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper presents the two-bit stochastic converter theory of operation. This converter could be used for the precise measurement of the effective (root-mean-square) value of voltage, current, electric power or energy and thus, could be applicable to grid measurements. The key contribution of this paper is the theoretical derivation of error limits when measuring signals using the stochastic method. Standard deviation of measured value over a specified measuring period is defined as an error. When finding expressions for the measured quantity and its error, time is treated as an independent uniform random variable; therefore, probability theory and statistical theory of samples can be applied. This condition is necessary because the presented problem is highly nonlinear and stochastic and thus, cannot be solved by the linear theory of discrete signals and systems, or by the theory of random processes. The presented solution is generalized in order to include the measurements of the definite integral of the product of a finite number of signals.
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- 2012
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21. A prototype of a system for detecting G force in an automobile, based on two ESP32’s
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Gutai, Ivan, primary, Sovilj, Platon, additional, Subotin, Marina, additional, Novakovic, Dorde, additional, Gazivoda, Nemanja, additional, and Vujicic, Bojan, additional
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- 2021
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22. Metoda merenja snage i energije vetra zasnovana na merenju na intervalu
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Sovilj, Platon, Pejić, Dragan, Pilipović, Stevan, Kovačević, Dragan, Mitrović, Zoran, Urekar, Marjan, Ličina, Boris, Sovilj, Platon, Pejić, Dragan, Pilipović, Stevan, Kovačević, Dragan, Mitrović, Zoran, Urekar, Marjan, and Ličina, Boris
- Abstract
U disertaciji je prikazan i predložen novi metod merenja snage i energije vetra koji se bazira na stohastičkoj digitalnoj mernoj metodi (SDMM), umesto do sada korišćene standardne sempling metode (SSM). Standard za merenje brzine vetra predstavlja anemometar sa šoljicama, koji na svom izlazu daje sinusni napon čija su amplituda i frekvencija linearno zavisne od brzine vetra. Kako su snaga i energija vetra proporcionalne trećem stepenu brzine vetra, u tu svrhu se primenjuje generalizovan hardver namenjen za računanje proizvoda tri ulazna signala. Zbog niskog frekvencijskog opsega ulaznog signala izvršeno je značajno pojednostavljenje hardvera mernog uređaja. Teorijskom analizom, simulacijom, a potom i eksperimentom potvrđena je hipoteza istraživanja, da se SDMM uspešno može koristiti za merenje snage i energije vetra., In this dissertation а new wind power and energy measurement method, based on Stochastic Digital Measurement Method (SDMM), was elaborated and proposed, to replace the commonly used Standard Sampling Method (SSM). The standard for wind speed measurement is a cup anemometer that provides a sinusoidal voltage on its output, having the amplitude and frequency linearly dependent of the wind speed. Since the wind power and energy are proportional to the third degree of the wind speed, the general case hardware has been designed for the product calculation over three input signals. The low frequency range of the input signal allows for a significant simplification of the measuring instrument hardware. By theoretical analysis and simulation, and consequently through an experiment the hypothesis of this research was confirmed - that SDMM can be successfully used to measure wind power and energy.
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- 2020
23. A Method for Generating a Sample of Two Uniformly Distributed Random Variables With Prescribed Coefficient of Correlation
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Novakovic, Dorde, primary, Pejic, Dragan, additional, Grbic, Tatjana, additional, Pejic, Marko, additional, Sovilj, Platon, additional, and Medic, Slavica, additional
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- 2021
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24. Calibration of EOG and ECG instrumentation modules in smart biofeedback system
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Sovilj, Platon, primary, Novakovic, Dorde, additional, Makal, Jaroslaw, additional, Walendziuk, Wojciech, additional, Petrovic, Nikola, additional, and Pejic, Dragan, additional
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- 2020
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25. Measurement of Event-Related Brain Potentials (ERP) Amplitude and Latency Based on Digital Stochastic Measurement over Interval
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Novakovic, Djordje, primary, Sovilj, Platon, additional, Petrovic, Nikola, additional, Milovanovic, Milan, additional, Makal, Jaroslaw, additional, and Walendziuk, Wojciech, additional
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- 2020
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26. Stochastic Digital Measurement Method and Its Application in Signal Processing
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Radonjić, Aleksandar, Sovilj, Platon, Đorđević Kozarov, Jelena, Vujičić, Vladimir, and Petrova, Victoria M.
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stochastic measurements ,Fourier coefficients ,DFT processor ,signal processing - Abstract
Classical measurement approach is often described as a process of discretizing an analogue signal in order to easily process it in some type of digital signal processor. Although this approach has been considered to be universally applicable, practical experience has shown that some signals (e.g. fast and/or noisy signals) cannot be always precisely measured. To overcome this problem, in the late 1990s, a new measurement approach called stochastic digital measurement method (SDMM) was presented. At the beginning, this method was intended for high-precision measurements of the integral (the mean value) of a product of two signals. However, in the late 2000s, it was shown that SDMM can be used to compute the Discrete Fourier Transform (DFT). Compared to the classical DFT/FFT processors, SDMM-based ones have two important advantages: first, they are much simpler and cheaper to implement, and second, they allow us to compute individual DFT components either in isolation or in parallel. This chapter is a review of the evolution of SDMM with a special emphasis on a two-bit SDMM. Topics covered include: theoretical foundations of SDMM, the architecture of SDMM-DFT processor and an example of prototype instrument used in power grid networks. This is the peer-reviewed version of the chapter: Radonjić, A., Sovilj, P., Đorđević Kozarov, J., Vujičić, V., 2019. Stochastic Digital Measurement Method and Its Application in Signal Processing, in: Advances in Engineering Research. Volume 27. Nova Science Publishers, Hauppauge, pp. 169–190. ISBN 978-1-5361-4803-9
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- 2019
27. Measurement in Fourier domain – a Natural Method of Big Data Volume Reduction
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Vujičić, Vladimir, Sokola, Marija, Radonjić, Aleksandar, and Sovilj, Platon
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Big Data ,stochastic measurements ,Fourier coefficients ,signal power - Abstract
The paper presents an idea of a measurement in a Fourier domain by a means stochastic digital measurement method (SDMM) as a natural and logical way to reduce the amount of big data in for processing in real time. The measurement method is explained and its application to the power and energy measurements in the power grid is briefly described.
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- 2019
28. Нова метода за повећање ефективне резолуције стохастичких мерних инструмената високих перформанси
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Pejić, Dragan, Sovilj, Platon, Kovačević, Dragan, Mitrović, Zoran, Urekar, Marjan, Gazivoda, Nemanja, Pejić, Dragan, Sovilj, Platon, Kovačević, Dragan, Mitrović, Zoran, Urekar, Marjan, and Gazivoda, Nemanja
- Abstract
Дисертација истражује утицај примене дитерског сигнала (дискретног аналогног униформног шума) генерисаног новом методом на повећање ефективне резолуције мерних инструмената базираних на стохастичкој дигиталној мерној методи. У дисертацији је дат преглед досадашњих решења базираних на стохастичкој дигиталној мерној методи у циљу сагледавања потребе и оправданости истраживања. Предложено решење представља комбинацију псеудослучајног и истински случајног генератора и као такво задржава најбоље особине из обе области. Дaт je прeдлoг нoве методе гeнeрисaњa шумa унифoрмнe рaспoдeлe aмплитудa. Умeстo уoбичajeнoг нaчинa гeнeрисaњa кoришћeњeм гeнeрaтoрa псeудoслучajних брojeвa и Д/А кoнвeртoрa, oвдe сe прeдлaжe гeнeрисaњe зaснoвaнo нa нeунифoрмнoм одабирању тeстeрaстoг или троугаоног нaпoнa. Oсим уштeдe збoг нeкoришћeњa Д/А кoнвeртoрa, дoбит je и мoгућнoст гeнeрисaњa нaпoнa из кoнтинуалнoг, умeстo дискрeтнoг скупa aмплитудa. Вeћинa дaнaшњих хaрдвeрских гeнeрaтoрa псeудoслучajнoг нaпoнa, сe бaзирa нa употреби микрoкoнтрoлeра и Д/A кoнвeртoра, пa je нa тaj нaчин рeзoлуциja гeнeрисaњa псeудoслучajнoг нaпoнa oгрaничeнa резолуцијом Д/A кoнвeрторa. Одабирањем тестерастог или троугаоног напона предложеном методом се остварује готово неограничена резолуција. Употреба овако генерисаног дитерског сигнала доводи до повећања ефективне резолуције код стохастичких мерних инстурмената. Симулацијом је одређена оптимална структура генератора на основу предложене методе. Експериментална мерења су изведена помоћу развијеног прототипа хардверског генератора., Disertacija istražuje uticaj primene diterskog signala (diskretnog analognog uniformnog šuma) generisanog novom metodom na povećanje efektivne rezolucije mernih instrumenata baziranih na stohastičkoj digitalnoj mernoj metodi. U disertaciji je dat pregled dosadašnjih rešenja baziranih na stohastičkoj digitalnoj mernoj metodi u cilju sagledavanja potrebe i opravdanosti istraživanja. Predloženo rešenje predstavlja kombinaciju pseudoslučajnog i istinski slučajnog generatora i kao takvo zadržava najbolje osobine iz obe oblasti. Dat je predlog nove metode generisanja šuma uniformne raspodele amplituda. Umesto uobičajenog načina generisanja korišćenjem generatora pseudoslučajnih brojeva i D/A konvertora, ovde se predlaže generisanje zasnovano na neuniformnom odabiranju testerastog ili trougaonog napona. Osim uštede zbog nekorišćenja D/A konvertora, dobit je i mogućnost generisanja napona iz kontinualnog, umesto diskretnog skupa amplituda. Većina današnjih hardverskih generatora pseudoslučajnog napona, se bazira na upotrebi mikrokontrolera i D/A konvertora, pa je na taj način rezolucija generisanja pseudoslučajnog napona ograničena rezolucijom D/A konvertora. Odabiranjem testerastog ili trougaonog napona predloženom metodom se ostvaruje gotovo neograničena rezolucija. Upotreba ovako generisanog diterskog signala dovodi do povećanja efektivne rezolucije kod stohastičkih mernih insturmenata. Simulacijom je određena optimalna struktura generatora na osnovu predložene metode. Eksperimentalna merenja su izvedena pomoću razvijenog prototipa hardverskog generatora., The dissertation investigates the impact of the application of the dithering signal (discrete analogue uniform noise) generated by the new method for increasing the effective resolution of measurement instruments based on the stochastic digital measurement method. The dissertation provides an overview of the existing solutions based on the stochastic digital measurement method in order to understand the need and justification of the research. The proposed solution represents a combination of a pseudorandom and truly random generator and as such holds the best features in both areas. А suggestion of a new way of generating the noise of the uniform distribution of amplitudes is presented. Instead of the usual way of generating using a pseudorandom number generator and a D/A converter, the generation based on the nonuniform sampling of sawtooth or triangle voltage is proposed. In addition to the savings due to the non-use of a D/A converter, the possibility of generating voltages from a continual instead of a discrete amplitude set is also obtained. Most of today's hardware pseudorandom voltage generators are based on the use of a microcontroller and D/A converter, so in this way the resolution of the pseudorandom voltage generation is limited by the resolution of the D/A converter. By sampling the sawtooth or triangle voltage using the proposed method, almost unlimited resolution is achieved. The use of this generated dither signal leads to an increase in effective resolution in stochastic measuring instruments. The simulation determined the optimal structure of the generator based on the proposed method. Experimental measurements were made using developed hardware.
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- 2019
29. Hardver I Softver Otvorenog Koda Za Biomedicinska Merenja
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Sovilj, Platon and Đorđe Novaković
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Primena hardvera i softvera otvorenog koda u edukaciji.
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- 2018
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30. Open source hardware and software for biomedical measurements
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Sovilj, Platon
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open source ,software ,biomedical engineering ,hardware ,measurement ,ComputingMilieux_MISCELLANEOUS - Abstract
on open source software and hardware for measurements of biomedical signals for PSSOH 2018 conference organized by University of Belgrade - School of Electrical Engineering.
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- 2018
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31. Naturally weighted measurement data in power grid – measurement data in Fourier domain
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Vujičić, Vladimir, Radonjić, Aleksandar, and Sovilj, Platon
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Fourier coefficients ,stochastic digital measurements - Abstract
The latest development of stochastic digital measurement method allows extremely simple measurement of Fourier coefficients and, thus, the harmonic amplitudes: the natural weights of the measurement data in Fourier domain. The significance of each measurement data is defined by its weight, which allows the optimization of data recording, data analysis and artificial neural network training in a power grid.
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- 2018
32. Мерење стабилности фреквенције у фреквенцијском домену
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Mitrović, Zoran, Sovilj, Platon, Denić, Dragan, Pejić, Dragan, Antić, Boris, Milanović, Ivica, Mitrović, Zoran, Sovilj, Platon, Denić, Dragan, Pejić, Dragan, Antić, Boris, and Milanović, Ivica
- Abstract
Дисертација истражује најприхватљивије методе мерења стабилности фреквенције у фреквенцијском домену, односно мерење вредности величине „фазни шум“, приликом процеса еталонирања мерне опреме. Када се говори о мерној опреми која је предмет еталонирања, дисертација је, пре свега, окренута ка еталонирању врхунских комерцијалних стандарда (еталона) фреквенције. Приказана истраживања су била основ за покретање и реализацију истраживачко-развојног пројекта у оквиру Министарства одбране, који је имао за циљ оспособљавање метролошке лабораторије Техничког опитног центра Војске Србије за потпуно еталонирање мерне опреме из области времена и фреквенције. Различите методе мерења подразумевају и различите мерне могућности, као и врло широк спектар еталонске и мерне опреме која се користи при њиховој реализацији. У дисертацији се приказују различити начини мерења фазног шума и описују методе реализоване на основу доступне мерне опреме. Како се ради о методама упоредне анализе референтног и мереног сигнала, посебно критична позиција је одабир референце, односно референтног еталона. Истраживање је довело до закључака којима је предложен метод мерења потребне и довољне мерне несигурности као и начин реализације изабране методе, односно одабир еталонске мерне опреме. У циљу увођења мерне методе у употребу, извршена су и приказана мерења на различитим типовима и врстама мерне опреме. Валидација методе је остварена билатералним поређењем са Дирекцијом за мере и драгоцене метале, Група за време, фреквенцију и дистрибуцију времена. Да је могуће реализовати методу мерења фазног шума приликом еталонирања најквалитетнијих осцилатора је постављена хипотеза дисертације, која је истраживањем доказана и практично спроведена. Крајњи резултат истраживања је довео до увођења признате методе еталонирања фазног шума, први пут, Disertacija istražuje najprihvatljivije metode merenja stabilnosti frekvencije u frekvencijskom domenu, odnosno merenje vrednosti veličine „fazni šum“, prilikom procesa etaloniranja merne opreme. Kada se govori o mernoj opremi koja je predmet etaloniranja, disertacija je, pre svega, okrenuta ka etaloniranju vrhunskih komercijalnih standarda (etalona) frekvencije. Prikazana istraživanja su bila osnov za pokretanje i realizaciju istraživačko-razvojnog projekta u okviru Ministarstva odbrane, koji je imao za cilj osposobljavanje metrološke laboratorije Tehničkog opitnog centra Vojske Srbije za potpuno etaloniranje merne opreme iz oblasti vremena i frekvencije. Različite metode merenja podrazumevaju i različite merne mogućnosti, kao i vrlo širok spektar etalonske i merne opreme koja se koristi pri njihovoj realizaciji. U disertaciji se prikazuju različiti načini merenja faznog šuma i opisuju metode realizovane na osnovu dostupne merne opreme. Kako se radi o metodama uporedne analize referentnog i merenog signala, posebno kritična pozicija je odabir reference, odnosno referentnog etalona. Istraživanje je dovelo do zaključaka kojima je predložen metod merenja potrebne i dovoljne merne nesigurnosti kao i način realizacije izabrane metode, odnosno odabir etalonske merne opreme. U cilju uvođenja merne metode u upotrebu, izvršena su i prikazana merenja na različitim tipovima i vrstama merne opreme. Validacija metode je ostvarena bilateralnim poređenjem sa Direkcijom za mere i dragocene metale, Grupa za vreme, frekvenciju i distribuciju vremena. Da je moguće realizovati metodu merenja faznog šuma prilikom etaloniranja najkvalitetnijih oscilatora je postavljena hipoteza disertacije, koja je istraživanjem dokazana i praktično sprovedena. Krajnji rezultat istraživanja je doveo do uvođenja priznate metode etaloniranja faznog šuma, prvi put, The dissertation examines the most acceptable methods for measuring the frequency stability in the frequency domain, that is, measuring the value of the "phase noise", during the process of measuring equipment calibration. When it comes to measuring equipment as a subject of calibration, the dissertation is, first of all, oriented towards the calibration of the highest commercial frequency standards. The presented researches were the basis for initiation and realization of the research and development project within the Ministry of Defense, which was aimed at training the metrology laboratory of the Technical Test Center of the Serbian Army for complete calibration of measuring equipment in the area of time and frequency. Different measurement methods also involve different measurement possibilities, as well as a very wide range of calibration and measuring equipment used in their realization. Different methods of measuring phase noise are described in the dissertation and they describe realized methods based on available measuring equipment. As for methods of comparative analysis of the reference and measured signal, a particularly critical position is the selection of the reference, that is, the reference oscillator. The research led to conclusions suggesting the method of measuring the necessary and sufficient measurement uncertainty, as well as the method of realization of the chosen method, i.e. selection of the standard measuring equipment. In order to put the measurement method into practice, measurements were performed on different types of measuring equipment. Validation of the method was achieved by bilateral comparison with the Directorate of Measures and Precious Metals, Group for time, frequency and time dissemination. The possibility to realize the method of phase noise measurement during the calibration of the highest quality oscillators is a hypothesis of the dissertation that has been set up, and has been proven and practically carried out by the re
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- 2018
33. Prilog optimizaciji performansi digitalnih merenja
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Pejić, Dragan, Sovilj, Platon, Kovačević, Dragan, Mitrović, Zoran, Jeličić, Zoran, Urekar, Marjan, Pejić, Dragan, Sovilj, Platon, Kovačević, Dragan, Mitrović, Zoran, Jeličić, Zoran, and Urekar, Marjan
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U tezi se razmatra kriterijum optimalnosti stohastičkog fleš A/D konvertora (SFADC) koji predstavlja osnovu stohastičke digitalne metode merenja (SDMM). Razvijen je matematički i simulacioni model višebitnog SFADC i određen optimum broja bita rezolucije. Napravljen je hardverski prototip 4-bitnog stohastičkog mernog instrumenta (SMI), koji je ispitan brojnim eksperimentima i upoređen sa teorijski određenim vrednostima performansi merenja. Hipoteza ove teze – da postoji optimalni broj bita rezolucije SMI pri kome se ostvaruje maksimalna dobit u preciznosti merenja po ceni dupliranja potrebnog hardvera – potpuno je potvrđena., The thesis considers the criterion of optimality of the stochastic flash A/D converter (SFADC), which is the basis of the stochastic digital measurement method (SDMM). The mathematical and simulation model of the multibit SFADC was developed and the optimal number of bits of resolution was determined. A hardware prototype of a 4-bit stochastic measuring instrument (SMI) was made, tested in numerous experiments and compared with theoretically determined measurement performance values. The hypothesis of this thesis - that there is an optimal number of SMI resolution bits in which the maximum benefit of the measurement precision is achieved at the price of duplication of the required hardware - is fully confirmed
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- 2018
34. Метода мерења електроокулографског сигнала на интервалу са преклапањем временских прозора
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Sovilj, Platon, Mitrović, Zoran, Radenković, Dragan, Lukač, Damir, Pejić, Dragan, Đorđević-Kozarov, Jelena, Sovilj, Platon, Mitrović, Zoran, Radenković, Dragan, Lukač, Damir, Pejić, Dragan, and Đorđević-Kozarov, Jelena
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У тези је предложена метода мерења ЕОГ сигнала на интервалу са преклапањем временских прозора, која представља модификацију дигиталне стохастичке методе мерења (ДСММ). Хардвер којим се предложена метода може имплементирати заснован је на рачунарској платформи и микроконтролерској структури. Метода је испитана бројним симулацијама и експериментима. Хипотеза ове тезе – да модел мерења ЕОГ сигнала на интервалу са преклапањем временских прозора омогућава пројектовање ЕОГ мерног уређаја који је отпорнији на утицај шума него ЕОГ мерни уређаји засновани на класичном дигиталном мерењу – потпуно је потврђена., U tezi je predložena metoda merenja EOG signala na intervalu sa preklapanjem vremenskih prozora, koja predstavlja modifikaciju digitalne stohastičke metode merenja (DSMM). Hardver kojim se predložena metoda može implementirati zasnovan je na računarskoj platformi i mikrokontrolerskoj strukturi. Metoda je ispitana brojnim simulacijama i eksperimentima. Hipoteza ove teze – da model merenja EOG signala na intervalu sa preklapanjem vremenskih prozora omogućava projektovanje EOG mernog uređaja koji je otporniji na uticaj šuma nego EOG merni uređaji zasnovani na klasičnom digitalnom merenju – potpuno je potvrđena., EOG signal measurement method over an interval using overlapping time windows, which represents the modification of the digital stochastic measurement method (DSMM), has been proposed in this thesis. The hardware that can implement the proposed method is based on a computer platform and a microcontroller structure. The method has been tested with numerous simulations and experiments. Hypothesis of this thesis - the model of EOG signal measurement over an interval using overlapping time windows allows a design of EOG measuring device more resistant to the noise impact than the EOG measuring devices based on classical digital measurement - has been fully confirmed.
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- 2018
35. Prilog savremenom etaloniranju strujnih mernih transformatora
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Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Pejić, Dragan, Antić, Boris, Naumović-Vuković, Dragana, Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Pejić, Dragan, Antić, Boris, and Naumović-Vuković, Dragana
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U ovoj doktorskoj disertaciji prikazana je koncepcija, realizacija i potvrda nove metode jednovremenog etaloniranja strujnih mernih transformatora sa dve različite merne aparature. Pregledom stručne literature ne postoji podatak da je ova metoda ranije primenjivana. U disertaciji su prikazane različite merne metode za ispitivanje i etaloniranje mernih transformatora koje imaju primenu u savremenoj praksi i koje podrazumevaju i različite merne mogućnosti. Takođe je i ekperimentalno potvrđeno jednovremeno ispitivanje i etaloniranje strujnih mernih transformatora sa nekoliko mernih aparatura koje su zasnovane na različitim metodama. Sprovedna istraživanja i eksperimentalni rezultati pokazuju i potvrđuju niz prednosti ovakvog načina etaloniranja. Detaljna analiza komponenti merne nesigurnosti pokazala je da se primenom ove metode postiže poboljšanje merne nesigurnost etaloniranja za skoro red veličine u odnosu na klasično pojedinačno etaloniranje sa dve različite merne aparature. Analiza uticajnih veličina na mernu nesigurnost pokazuje da se po ovoj novoj metodi etaloniranja eliminiše niz komponenti od kojih su najznačajnije: uticaj nejednakosti referentnih struja i ispitnog opterećenja. Istraživanja su takođe pokazala da jednovremena metoda osim što doprinosi podizanju tačnosti etaloniranja strujnih transformatora, ima primenu i u etaloniranju mernih aparatura za ispitivanje tačnosti mernih transformatora i interkonparaciji strujnih etalon transformatora. Kroz konkretne primere realizovane u praksi, razmotreni su i prikazani načini etaloniranja mernih aparatura za ispitivanje tačnosti ovom novom metodom. Interkomparacijom dva merna sistema visoke klase tačnosti Nacionalnog merološkog instituta Kanade (National Research Council Canada), od kojih je jedna razvijena u Elektrotehničkom Institutu "Nikola Tesla", pokazana je i prednost primene jednovremene metode u oblasti primarne metrologije strujnih mernih transformatora., The dissertation presents the concept, its realisation and verification of the new method of simultaneous comparison of the current transformers by two different measuring apparatus. It is shown by searching the literature, that this method has not been used before. In this dissertation different measuring methods for testing and calibration of current transformers, with their different measuring capabilities are presented. Most of them have been used in recent practice. Furthermore, the experimental verification of new simultaneous calibration method is presented. For this reason some measuring apparatus based on different measuring methods were used. Conducted research and experimental results confirmed a number of advantages of this calibration method. Detailed analysis of the components of the uncertainty of measurements shown that using simultaneous method uncertainty of measurements have been improved comparing to method with two individual calibration by different apparatus. In that case some of the measuring uncertainty components can be neglected. The most significant is component caused by variation of referent current and component caused by variation of burden. The research has also showed that simultaneous method can be used for calibration of measuring apparatus for current transformer accuracy testing and their inter-comparisons. The ways of calibration of apparatus for current transformer accuracy testing are considered and presented, through concrete examples realized in practice. A high-accuracy comparison of two NRC (National Research Council Canada) calibration systems were carried out by new simultaneous method. One measuring system is developed at Electrical Engineering institute Nicola Tesla, Belgrade. Accordingly the advantage of simultaneous method applied at the primary metrology of current transformer is verified.
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- 2018
36. Exploring alternatives for visual word grammatical priming procedure: an ERP study
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Ković, Vanja, Sovilj, Platon, Lalović, Dejan, Ković, Vanja, Sovilj, Platon, and Lalović, Dejan
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In search of the optimal method for assessing grammatical context effects on the visual word processing, we designed a study to demonstrate that in a simple task of reacting to "oddball" word pairs, subjects read and linguistically processed both the function and the content word simultaneously presented in a given pair. Properties of the oddball ERP paradigm allowed for stipulation that word pairs would evoke P300 potentials, and that properties and differences between potentials evoked by grammatically congruent and grammatically neutral pairs would indicate a type of stimuli processing. To test such prediction, we paired a noun and a verb with a congruent preposition and a personal pronoun respectively, preceding them to create a grammatically constrained condition, or with the conjunction preceding both target words to create unconstrained condition. The stimuli were employed in the two-stimulus oddball paradigm. Main outcome of our experiment was that the stimuli chosen evoked clear P300 potential as deviants in three out of four situations. More interestingly, in each of the situations P300 peaked well after 400 ms, falling near the upper limit of P300 range as usually reported. Such P300 latencies marked semantic processing (Polich, 2007), and indicated subjects read and linguistically processed both words in pairs. Our results suggested that in order to study effects of the grammatical context on the visual word processing, the standard priming procedure in which primes temporally preceded targets might not be required, or that it could at least be complemented by methods involving simultaneous primes and target presentation less burdened by technical issues.
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- 2018
37. Stochastic digital DFT processor and its application to measurement of reactive power and energy
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Pejić, Dragan, Pejić, Dragan, Naumović Vuković, Dragana, Vujičić, Bojan, Radonjić, Aleksandar, Sovilj, Platon, Vujičić, Vladimir, Pejić, Dragan, Pejić, Dragan, Naumović Vuković, Dragana, Vujičić, Bojan, Radonjić, Aleksandar, Sovilj, Platon, and Vujičić, Vladimir
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In this paper we present the model of digital stochastic DFT processor. Compared to the classical DFT/FFT processors, the proposed model has two advantages: first, it is much simpler and cheaper to implement, and second, it allows us to compute individual DFT components either in isolation or in parallel. In order to prove the validity of our model, we have simulated the measurement of reactive power and energy. In addition, we have conducted several experiments under field and laboratory conditions. The obtained results have shown that reactive power and energy can be measured with an accuracy of several ppm. © 2018 Elsevier Ltd
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- 2018
38. Stochastic digital DFT processor and its application to measurement of reactive power and energy
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Pejic, Dragan, primary, Naumovic-Vukovic, Dragana, additional, Vujicic, Bojan, additional, Radonjic, Aleksandar, additional, Sovilj, Platon, additional, and Vujicic, Vladimir, additional
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- 2018
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39. EXPLORING ALTERNATIVES FOR VISUAL WORD GRAMMATICAL PRIMING PROCEDURE: AN ERP STUDY
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Ković, Vanja, primary, Sovilj †, Platon, primary, and Lalović, Dejan, primary
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- 2018
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40. Izražavanje merne nesigurnosti kapacitivnih razdelnika napona sa koncentrisanim parametrima u oblasti visokih frekvencija
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Mitrović, Zoran, Sovilj, Platon, Denić, Dragan, Pejić, Dragan, Antić, Boris, Kovačević, Uroš, Mitrović, Zoran, Sovilj, Platon, Denić, Dragan, Pejić, Dragan, Antić, Boris, and Kovačević, Uroš
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Ova disertacija sadrži analizu mogućnosti merenja brzih impulsnih napona i izražavanja odgovarajuće merne nesigurnosti. Dokazano je da je moguće izvršiti numeričku simulaciju odziva mernog sistema na impuls brzine porasta reda veličine pikosekunde. Izražena je merna nesigurnost kapacitivnog razdelnika napona Monte Karlo metodom. Prikazan je način konstruisanja kapacitivnog razdelnika napona sa talasovodnim prilagodnim otporom. Konstruisano je više tipova kapacitivnih razdelnika napona izuzetno dobrih karakteristika. Na osnovu dobijenih rezultata je odabran kapacitivni razdelnik napona najboljih karakteristika i izražena je njegova merna nesigurnost, This thesis contains an analysis of the possibilities for measurement of very fast pulse voltages and proper expression of measurement uncertainty. It has been proven that it is possible to perform numerical simulation to the response of the very fast pulse voltage with rise time at the order of picoseconds of the measuring system. Measurement uncertainty of capacitive voltage dividers is expressed by Monte Carlo method. The way of constructing capacitive voltage dividers with a waveguide resistance is shown in this thesis. The design of four types of capacitive voltage dividers with extremely good features are shown. Based on these results, capacitive voltage divider with best characteristics is selected and its measurement uncertainty is expressed.
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- 2017
41. Detekcija nule A/D konvertorom niske rezolucije
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Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Spasić-Jokić, Vesna, Pejić, Dragan, Vujičić, Bojan, Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Spasić-Jokić, Vesna, Pejić, Dragan, and Vujičić, Bojan
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U tezi je rešavan centralni problem – detekcija nule dvobitnom stohastičkom digitalnom mernom metodom (SDMM). Formulisane su dve metode detekcije nule primenom dvobitne SDMM. Po prvoj metodi dinamička rezerva je oko 100 dB a po drugoj ne manje od 160 dB. Obe metode su proverene teorijski, simulaciono i eksperimentalno. Pored rešenja centralnog problema, dato je i nekoliko rešenja problema koji su sa njim vezani. Hipoteza ove teze – „dvobitna SDMM je u opsegu 0 % - 10% FS bolja od standardne sempling metode (SSM)“ – je potpuno potvrđena u svim razmatranim slučajevima., The main goal of this thesis was null-detection using a two-bit stochastic digital measurement method (SDMM). Two methods of null-detection, using two-bit SDMM, were formulated. Using the first method around 100 dB of dynamic reserve was achieved and using the second one no less than 160 dB. Both methods were theoretically, using simulation and experimentally confirmed. In addition to the solution of the main problem, several other related problems were also solved. The hypothesis of this thesis – “two-bit SDMM in range from 0 % - 10 % FS is better than the standard sampling method (SSM)” has been fully confirmed in all considered cases.
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- 2017
42. Reconstruction of an analog signal measured using two-bit stochastic digital measurement method
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Vujičić, Bojan, Zupunski, Ljubica, Sovilj, Platon, Radonjić, Aleksandar, Vujičić, Bojan, Zupunski, Ljubica, Sovilj, Platon, and Radonjić, Aleksandar
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This paper considers the process of analog signal reconstruction measured by using a two-bit stochastic digital measurement method. The proposed process is tested by digital simulations on the example of a triangular signal. It is shown that for sampling frequency of 10.58 MHz and measurement interval of 1.28 s the precision (effective resolution) of the reconstructed signal is 12.18 bits. If one wants to achieve a more precise reconstruction, it is necessary to increase the measurement time interval and/or sampling frequency.
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- 2017
43. Proposal for extension of the standard paradigm of discrete digital measurement
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Gazivoda, Nemanja, primary, Sovilj, Platon, additional, Vujicic, Vladimir, additional, and Mitrovic, Zoran, additional
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- 2017
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44. Reconstruction of an analog signal measured using two-bit stochastic digital measurement method
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Vujicic, Bojan, primary, Zupunski, Ljubica, additional, Sovilj, Platon, additional, and Radonjic, Aleksandar, additional
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- 2017
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45. Low power stochastic sensor in Internet of Things environment
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Sovilj, Platon, primary, Vujicic, Bojan, additional, Pejic, Dragan, additional, Novakovic, Dorde, additional, Avramov-Zamurovic, Svetlana, additional, and Makal, Jaroslaw, additional
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- 2017
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46. Metoda merenja harmonika u realnoj distributivnoj mreži primenom A/D konvertora dvobitne rezolucije
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Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Spasić-Jokić, Vesna, Pejić, Dragan, Beljić, Željko, Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Spasić-Jokić, Vesna, Pejić, Dragan, and Beljić, Željko
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U disertaciji je prikazano teorijsko i praktično istraživanje koje se odnosi na utvrđivanje potrebnih i dovoljnih uslova za merenje harmonika u realnoj elektrodistributivnoj mreži. Cilj istraživanja doktorske disertacije je formulisanje merne metode i na metodi baziranom hardveru - po mogućnosti minimalne rezolucije primenjenih A/D konvertora - praktično dvobitnih za merenje harmonika u realnoj elektrodistributivnoj mreži. Jednostavan hardver omogućuje jednostavna paralelna merenja, kao i mali broj izvora sistematske greške merenja, što je vrlo primenljivo u merenjima u realnoj distributivnoj mreži.Simulacionom analizom, a potom i eksperimentom potvrđena je hipoteza istraživanja., The dissertation shows the theoretical and practical research related to the determination of necessary and sufficient conditions for the measurement of harmonics in a real power grid. The aim of the PhD research is to formulate method and hardware based on the measurement method - preferably with minimal resolution of applied A/D converter - practically 2-bit, for harmonics measurement in a real power grid. Simple hardware allows simple parallel measurements, as well as a small number of systematic measurement error, which is applicable for measurement in the real power grid. Simulation analysis, followed by the experiment, confirmed the hypothesis of this research.
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- 2016
47. Measurement firmware for pulse oximetry sensor
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Gazivoda, Nemanja, primary, Beljic, Zeljko, additional, Sovilj, Platon, additional, Pejic, Dragan, additional, and Vujicic, Bojan, additional
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- 2016
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48. Стохастичка метода мерења напона и струје на високом напону
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Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Pejić, Dragan, Antić, Boris, Čomić, Dušan, Mitrović, Zoran, Sovilj, Platon, Kovačević, Dragan, Pejić, Dragan, Antić, Boris, and Čomić, Dušan
- Abstract
У раду je обрађен проблем мерења високог напона и струје у несинусидалној високонапонској мрежи, стање технике, предлог решења које подразумева неконвенционални начин мерења ових величина, практично израђен прототип и извршена потребна мерења која су потврђена теоријски. Мерење напона у високонапонској мрежи се врши напонским мерним трансформатором без језгра и интегрисаним мерилом хармоника (IMH), а затим се стохастичком методом мере хармоници напона, смерови и протоци снаге, односно енергије. За мерења струје на високом напону предлаже се калем Роговског и стохастичка метода мерења. Стохастичка метода мерења је заснована на додавању дитерског случајног сигнала на мерени сигнал. Сметње и присуство виших хармоника у мрежном сигналу су, за ову методу, додатни дитерски сигнали који методи не смањују тачност мерења., U radu je obrađen problem merenja visokog napona i struje u nesinusidalnoj visokonaponskoj mreži, stanje tehnike, predlog rešenja koje podrazumeva nekonvencionalni način merenja ovih veličina, praktično izrađen prototip i izvršena potrebna merenja koja su potvrđena teorijski. Merenje napona u visokonaponskoj mreži se vrši naponskim mernim transformatorom bez jezgra i integrisanim merilom harmonika (IMH), a zatim se stohastičkom metodom mere harmonici napona, smerovi i protoci snage, odnosno energije. Za merenja struje na visokom naponu predlaže se kalem Rogovskog i stohastička metoda merenja. Stohastička metoda merenja je zasnovana na dodavanju diterskog slučajnog signala na mereni signal. Smetnje i prisustvo viših harmonika u mrežnom signalu su, za ovu metodu, dodatni diterski signali koji metodi ne smanjuju tačnost merenja., A problem of measurement of high voltage and current in non-sinusoidal grid is given in the thesis, along with the current state in the field, the proposed non-conventional measurement method for these values, the realized prototype and the necessary measurement results that are confirmed theoretically. Measurement of voltage in high-voltage grid is performed using the coreless high voltage transformer and the Integrated harmonic measurement device (IMH). The stochastic method is used to measure harmonics of voltage, direction and flow of power and energy. For current measurement at high voltage level a Rogowski coil along with the Stochastic measurement method is proposed. Stochastic measurement method is based on adding a arbitrary dither signal to the measured signal. Disturbances and pollution of the grid signal are, for this method, additional dither signals that do not lower the measurement accuracy.
- Published
- 2015
49. Metoda merenja moždanih ERP potencijala zasnovana na merenju harmonika epohe
- Author
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Sovilj, Platon, Mitrović, Zoran, Denić, Dragan, Ković, Vanja, Klisurić, Olivera, Milovanović, Milan, Sovilj, Platon, Mitrović, Zoran, Denić, Dragan, Ković, Vanja, Klisurić, Olivera, and Milovanović, Milan
- Abstract
U radu je predložena metoda merenja moždanih ERP potencijala zasnovana na merenju harmonika epohe. Predložena metoda je zasnovana na pristupu takozvanog stohastičkog digitalnog merenja na intervalu (SDMI), a hardver sa kojim se ova metoda može implementirati je zasnovan na brzim A/D konvertorima i FPGA strukturi. Metoda je ispitana brojnim simulacijama i eksperimentima i pokazano je da SDMI manjeg broja epoha, sa zadovoljavajućom tačnošću, meri latenciju ERP-a, što je korisno kod vremenski kraćih merenja, kada tačno merenje amplitude ERP komponente nije od značaja.
- Published
- 2015
50. A Proposal of a Novel Method for Generating Discrete Analog Uniform Noise.
- Author
-
PEJIĆ, Dragan, GAZIVODA, Nemanja, LIČINA, Boris, UREKAR, Marjan, SOVILJ, Platon, and VUJIČIĆ, Bojan
- Subjects
DIGITAL-to-analog converters ,COMPUTER simulation ,PSEUDONOISE sequences (Digital communications) ,DISCRETE systems ,PROBABILITY density function - Abstract
This paper presents a proposal of a new way to generate analog noise, discrete in time, with uniform probability density function. Instead of the usual way of generating discrete analog uniform noise using a uniform pseudorandom number generator and a digital-to-analog converter, generating based on non-equidistant sampling of sawtooth voltage is suggested. The original hardware structure that implements this idea is suggested and its work is simulated. The simulations have confirmed the validity of the idea. The main gain is the unlimited resolution of the analog output of the uniform noise generator suggested. The resolution of standard uniform noise generators is limited by the resolution of the digital-to-analog converter used. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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