Journal of Contemporary Mathematical Analysis
(Armenian Academy of Sciences)
• 21 Nov 2021
Valjarević, Dragana • Petrović, Ljiljana
In this paper we consider the concept of statistical causality in continuous time between
filtrations associated with stopping times, which is based on Granger’s definition of causality.
Especially, we consider a generalization of a causality relationship “His a cause of E within F” from
fixed to stopping time. Then we apply the given concept of causality to strongly orthogonal stopped
martingales. We show the equivalence between the given concept of causality and orthogonality of
stopped l ...
Statistic and Probability Letters
(Science direct)
• 21 Jul 2021
Valjarević, Dragana • Merkle, Ana
In this paper we consider a concept of statistical causality, based on Granger’s definition
of causality and analyze the relationships between given causality and the concept
of measurable separability of σ-algebras. The measurable separability of σ-algebras is
defined in Florens et al. (1990). We give a generalization of that definition for flows
of information represented by filtrations and consider some properties of measurable
separability that are directly connected to the concept of s ...
Stochastics: An International Journal of Probability and Stochastic Processes
(Taylor and Francis)
• 21 Jul 2018
Petrović, Ljiljana • Valjarević, Dragana
The paper considers a statistical concept of causality in continuous
time in the filtered probability spaces which is based on the Granger’s
definition of causality. The given causality concept is then applied to
the solution of the martingale problem (associated with the stochastic
differential equation driven with semimartingales). More precisely,
we show that the given causality concept is closely connected to
the concept of extremality of measures for the solutions of the
martingale p ...
Stochastics: An International Journal of Probability and Stochastic Processes
(Taylor and Francis)
• 21 Jul 2021
Valjarević, Dragana • Petrović, Ljiljana
The statistical concept of causality in continuous time between
filtered probability spaces considered in this paper is based on
Granger’s definition of causality. The given concept of causality can
be connected to the purely discontinuous property for martingale
and filtration. If M is a purely discontinuous local martingale with
respect to purely discontinuous filtration (Gt), we prove that M will
remain purely discontinuous local martingale with respect to an
extension (Ft) of the filt ...
Statistic and Probability Letters
(Science Direct)
• 21 Nov 2020
Valjarević, Dragana • Petrović, Ljiljana
In this paper we consider the statistical concept for continuous-time stochastic processes,
which is based on Granger’s definition of causality. We, also, show that separability
is directly related to causality concepts. More precisely, we provide necessary
conditions, in terms of statistical causality, for the space Lp(Ω, G∞, P) to be separable.
The concept of statistical causality is related to the notion separability of stochastic
processes, too.
Bulletin of Korean Mathematical Society
• 21 Oct 2018
Petrović, Ljiljana • Valjarević, Dragana
In this paper we consider the concept of statistical causality
in continuous time between
ows of information, represented by ltra-
tions. Then we relate the given concept of causality to the equivalent
change of measure that plays an important role in mathematical nance.
We give necessary and sucient conditions, in terms of statistical causali-
ty, for extremality of measure in the set of martingale measures. Also, we
have considered the extremality of measure which involves the stopping ...
Bulletin of the Australian Mathematical Society
(Cambridge University Press)
• 01 Aug 2018
Panić, Stefan • Petrović, Milena • Mihajlov Carević, Miroslava
We improve the convergence properties of the iterative scheme for solving unconstrained optimisation problems introduced in Petrovic et al. [‘Hybridization of accelerated gradient descent method’, Numer. Algorithms (2017), doi:10.1007/s11075-017-0460-4] by optimising the value of the initial step length parameter in the backtracking line search procedure. We prove the validity of the algorithm and illustrate its advantages by numerical experiments and comparisons.
Mathematical Problems in Engineering
(Hindawi)
• 14 Apr 2020
Mihajlov Carević, Miroslava • Petrović, Milena • Denić, Nebojša
In this paper, we are going to demonstrate a method for determining the generating functions of tetrahedral, hexahedral, octahedral, dodecahedral, and icosahedral figurative numbers. The method is based on the differences between the members of the series of the mentioned figurative numbers, as well as on the previously specified generating functions for the sequence and geometric sequence.
ChemistrySelect
(Wiley-VCH GmbH)
• 08 Sep 2020
Veljović, Đorđe • Gurešić, Dejan • Jokić, Anja • Vasić, Vesna • Laban, Bojana
The silver nanoparticles (Ag NPs) were successfully synthesized by a facile solid-state chemical method. Ag NPs were obtained by a mechanochemical reaction between silver nitrate and sodium citrate, with the constant stirring and heating of reactants. The size and morphology characterization of NPs powder was performed by scanning electron microscopy. The obtained NPs were spherical with a 36 nm average particle size diameter. UV-Vis spectroscopy, dynamic light scattering, and zeta potential mea ...
Computer Applications in Engineering Education
(Wiley)
• 07 May 2020
Zlatković, Dragan • Denić, Nebojša • Petrović, Milena • Ilić, Miloš
E‐learning, as a complex system, includes distance learning, teaching materials in various forms and shapes, group and individual learning processes, as well as interactive and tutorial work. To increase the effectiveness and efficiency of the e‐learning system, it is necessary first of all to consider the characteristics of students and their learning styles. Based on the data collected in various ways, in surveys, using the distance learning dystem (DLS) Moodle, based on the subjective assessm ...
Optica Applicata
(Oficyna Wydawnicza Politechniki Wroclawskiej)
• 22 Mar 2018
Smilić, Marko • Perić, Zoran • Milić, Dejan • Marković, Aleksandar • Savić, Milan
In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight poin ...
Electronics and Electrical Engineering
(Kaunas University of Technology)
• 22 Jun 2018
Stevanović, Aco • Panić, Stefan • Spalević, Petar • Prlinčević, Bojan • Savić, Milan
Modelling of complex wireless transmission scenario over fading channels in the presence of multiple co- channel (CCI) interferers will be presented in this paper. Propagation environment will be modelled with general kappa- mu shadowed model, which can be reduced to other well- known model as its singularities. Probability density function (PDF) and cumulative distribution function (CDF) of resulting signal-to-interference (SIR) ratio statistics at the reception will be derived in the rapidly c ...
Macedonian Journal of Chemistry and Chemical Engineering
• 01 Apr 2024
Krstić, Milena • Petković, Branka • Milčić, Miloš • Mišić, Dušan • Santibanez, Juan Francisco
Two new nitrato complexes of zinc and nickel with 1,4,8,11-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc), have been synthesized and characterized. The IR spectral peaks showed that the coordinated and ionic nitrate ions are in agreement with the formula proposed by elemental anal-ysis. Conductometric titrations predicted methanol to be a convenient solvent for synthesis and revealed the stoichiometry of the complexes, while molar electrical conductivities indicated a 1 : 3 c ...
Elektronika ir Elektrotechnika
(Kaunas University of Technology)
• 23 Aug 2021
Perić, Zoran • Denić, Bojan • Savić, Milan • Vučić, Nikola • Simić, Nikola
This paper considers the design of a binary scalar quantizer of Laplacian source and its application in compressed neural networks. The quantizer performance is investigated in a wide dynamic range of data variances, and for that purpose, we derive novel closed-form expressions. Moreover, we propose two selection criteria for the variance range of interest. Binary quantizers are further implemented for compressing neural network weights and its performance is analysed for a simple classification ...
Int. J. Electrochem. Sci.
• 01 Apr 2024
Đurđić, Slađana • Vukojević, Vesna • Jevtić, Sonja • Pergal, Marija • Petković, Branka • Stanković, Dalibor
In this work, for the first time we proposed electrochemical behavior and development of an analytical procedure for quantification of pesticide clomazone. Electrochemical behavior of clomazone’s at boron-doped diamond electrode is characterized with irreversible oxidation at potential of around 1.6 V, in Britton-Robinson buffer solution at pH 2. It was found that potential of this oxidation was not pH dependent excluding presence of proton in the electrochemical reaction. Square wave voltammetr ...
Information Technology and Control
(Kaunas University of Technology)
• 24 Sep 2021
Perić, Zoran • Denić, Bojan • Savić, Milan • Dinčić, Milan • Mihajlov, Darko
Quantization and compression of neural network parameters using the uniform scalar quantization is carried out in this paper. The attractiveness of the uniform scalar quantizer is reflected in a low complexity and relatively good performance, making it the most popular quantization model. We present a design approach for the memoryless Laplacian source with zero-mean and unit variance, which is based on iterative rule and uses the minimal mean-squared error distortion as a performance criterion. ...
Chemistry & Biodiversity
(Wiley-VHCA AG, Zurich, Switzerland)
• 15 Jun 2020
Randjelović, Pavle • Radulović, Niko • Stojanović, Nikola • Dekić, Vidoslav • Dekić, Biljana • Stojiljković, Nenad • Ilić, Sonja
In this work we explored the possible polypharmacological potential of the already established antimicrobials against gastrointestinal pathogens, 4-(alkylamino)-3-nitrocoumarins, as antianxiety agents, using a battery of in vivo experiments. Three chosen coumarin derivatives, differing in the substituent (sec-butylamino, hexadecylamino, or benzylamino) at position 4, at the doses of 25, 50 and 100 mg kg-1, were evaluated in light/dark, open-field, horizontal wire and diazepam-induced sleep model ...
International Journal of Environmental Analytical Chemistry
• 01 Apr 2024
Vukojević, Vesna • Đurđić, Slađana • Jevtić, Sonja • Pergal, Marija • Marković, Aleksandar • Mutić, Jelena • Petković, Branka • Stanković, Dalibor
In this work, the electrochemical behaviour and the subsequent development of an analytical procedure for quantification of pesticide azamethiphos, using boron-doped diamond (BDD) electrode are reported for the first time. It was found that azamethiphos
electrochemical behaviour is irreversible oxidation at the potential of around 1.70 V, in 1 M nitric acid (pH 0). Also, it was found that potential of this oxidation was not pH dependent which can be attributed to the no proton involvement in el ...
Polish Journal of Environmental Studies
(HARD Publishing Company s.c.)
• 08 Sep 2020
Pecev-Marinković, Emilija • Miletić, Ana • Pavlović, Aleksandra • Tošić, Snežana • Mitić, Milan • Rančić, Sofija • Dekić, Biljana
The objective of this paper was to develop and apply the kinetic-spectrophotometric method for the determination of the pesticide dicamba in infant baby foods available in Serbia. The method is based on the inhibition effect of dicamba on the oxidation of sulfanilic acid (SA) by hydrogen peroxide in universal buffer (pH = 9.66) in the presence of Co2+ ion. The reaction was monitored spectrophotometrically at 368 nm. The HPLC method was used as a comparative method to verify the results of the ki ...
Chemistry & Biodiversity
(Wiley-VHCA AG, Zurich, Switzerland)
• 07 May 2019
Dekić, Biljana • Ristić, Milenko • Ristić, Novica • Mladenović, Marko • Dekić, Vidoslav • Ranđelović, Vladimir • Radulović, Niko
Some carnation species (Dianthus spp., Caryophyllaceae) exhibit a strong resistance to drought stress that is connected with the increased surface wax formation. Wax composition is unknown for the majority of Dianthus spp. Herein, mass spectral and gas chromatographic data, in combination with synthesis and chemical transformations (transesterification and synthesis of dimethyl disulfide adducts), enabled the identification of 151 constituents of diethyl-ether washings of fresh flowers of Dianth ...
Zeitschrift für Kristallographie - New Crystal Structures
• 14 Oct 2019
Dekić, Vidoslav • Rodić, Marko • Radulović, Niko • Ristić, Milenko • Dekić, Biljana • Gurešić, Dejan • Ristić, Novica
C16H12N2O4, triclinic, P1 (no. 2), a = 10.7105(5) Å, b = 11.2685(5) Å, c = 13.0145(6) Å, α = 99.292(4)°, β = 109.607(4)°, γ = 96.771(4)°, V = 1435.01(12) Å3, Z = 4, Rgt(F) = 0.0427, wRref(F2) = 0.1124, T = 295(2) K.
CCDC no.: 1957160
Czech Journal of Food Sciences
• 25 Oct 2019
Živić, Nebojša • Milošević, Slaviša • Dekić, Vidoslav • Dekić, Biljana • Ristić, Novica • Ristić, Milenko • Sretić, Ljiljana
The content of phytochemicals, total phenolics, total flavonoids and antioxidant potential of extracts of Juniperus communis L. and Juniperus oxycedrus L. berries were determined. Ethanol, ethyl acetate and chloroform were used for the process of extraction. Phytochemical monitoring was based on already known methods, while in vitro antioxidant activities were done by DPPH assay. Phytochemical screening showed a wide spectrum of phytochemicals. Ethanolic extract of Juniperus communis L. possesse ...
Zeitschrift für Kristallographie - New Crystal Structures
• 08 May 2019
Ristić, Milenko • Rodić, Marko • Radulović, Niko • Dekić, Biljana • Dekić, Vidoslav • Ristić, Novica • Gurešić, Dejan
C22H18O10Zn, triclinic, P1̄ (no. 2), a = 7.9616(3) Å, b = 9.5386(3) Å, c = 14.2569(4) Å, α = 81.713(3)°, β = 82.724(3)°, γ = 73.103(3)°, V = 1021.03(6) Å3, Z = 2, Rgt(F) = 0.0223, wRref(F2) = 0.0603, T = 295(2) K.
CCDC no.: 1905428
Journal of Knot Theory and Its Ramifications
(World Scientific Publishing Co. Pte. Ltd.)
• 12 Sep 2019
Kauffman, Louis • Velimirović, Ljubica • Najdanović, Marija • Rančić, Svetozar
We discuss the infinitesimal bending of curves and knots in R3. A brief overview of the results on the infinitesimal bending of curves is outlined. Change of the Willmore energy, as well as of the Möbius energy under infinitesimal bending of knots is considered. Our visualization tool devoted to visual representation of infinitesimal bending of knots is presented.
Journal of Knot Theory and Its Ramifications
(World Scientific Publishing Co. Pte. Ltd.)
• 03 Jan 2019
Najdanović, Marija • Rančić, Svetozar • Kauffman, Louis • Velimirović, Ljubica
In this paper, we consider infinitesimal bending of the second-order of curves and
knots. The total curvature of the knot during the second-order infinitesimal bending is
discussed and expressions for the first and the second variation of the total curvature
are given. Some examples aimed to illustrate infinitesimal bending of knots are shown
using figures. Colors are used to illustrate curvature values at different points of bent
knots and the total curvature is numerically calculated.
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN-SERIES A-APPLIED MATHEMATICS AND PHYSICS
(UNIVERSITY POLITEHNICA OF BUCHAREST)
• 01 Apr 2024
Stojanović, Vladica • Kevkić, Tijana • Vujaković, Jelena • Jelić, Gordana • Pažun, Brankica
In this paper, an application of the Stochastic Mellin Transforms (SMTs) in determination of the probability distribution functions (PDFs) of the Stochastic Volatility (SV) models is proposed. In that aim, three basic SV time series with Gaussian innovations have been considered, and their PDFs were obtained by using the inverse SMT formula.
Radiation Protection Dosimetry
• 01 Apr 2024
Yarmoshenko • Žunić, Zora S. • Mishra, Rosaline • Čeliković, Igor • Stojanovska, Zdenka • Yarmoshenko, Ilia V. • Malinovsky, Georgy • Veselinović, Nenad • Gulan, Ljiljana • Ćurguz, Zoran • Vaupotič, Janja • Ujic, Predrag • Kolarž, Predrag • Milić, Gordana • Kovacs, Tibor • Sapra, Balvindar K. • Kavasi, Norbert • Sahoo, Sarata K.
The main contribution to population exposure is due to radon and thoron progenies and not radon itself. The aim of this study was therefore to estimate annual effective dose using the results of Direct Radon and Thoron Progeny Sensors were exposed in 69 selected schools and 319 dwellings in several regions of Balkans: in Serbia: regions of Sokobanja and Kosovo and Metohija, Republic of Macedonia, Republic of Srpska and Slovenia. Obtained average total effective doses are in the range from 0.22 m ...
Journal of Modern Optics
(Taylor & Francis)
• 28 Aug 2019
Savović, Svetislav • Djordjevich, Alexandar • Simović, Ana • Drljača, Branko
By solving the power flow equation, we investigate the influence of mode coupling on space division
multiplexing capability of three multimode step-index silica optical fibres with a different strengths
of mode coupling. Results show that mode coupling significantly limits the length of these fibres
at which the space division multiplexing can be realized with a minimal crosstalk between the
neighbour optical channels. This is most pronounced in silica optical fibres with the strongest mode ...
Laser Physics
(IOP Science)
• 11 May 2020
Savović, Svetislav • Djordjevich, Alexandar • Simović, Ana • Drljača, Branko
We propose an angular division multiplexing in new designed multicore plastic optical fiber
with seven cores arranged in a hexagonal array. The influence of mode coupling on two-channel
angular division multiplexing capability in each of seven cores is investigated by solving the
power flow equation. Our numerical results show that mode coupling significantly limits the
fiber length at which the angular division multiplexing can be realized in each of seven cores
with a minimal crosstalk be ...
Open Physics
(De Gruyter)
• 26 Jan 2022
Kevkić, Tijana S. • Nikolić, Vojkan R. • Stojanović, Vladica S. • Milosavljević, Dragana D. • Jovanović, Slavica J.
Modeling of the electrostatic potential for fully depleted (FD) silicon-on-insulator (SOI) metal-oxide-semiconductor field effect transistor (MOSFET) is presented in this article. The modeling is based on the analytical solution of two-dimensional Poisson’s equation obtained by using the homotopy perturbation method (HPM). The HPM with suitable boundary conditions results in the so-called HPM solution in general and closed-form, independent of the surface potential. The HPM solution has been app ...
Open Physics
(De Gruyter)
• 10 May 2022
Milosavljević, Dragana D. • Kevkić, Tijana S. • Jovanović, Slavica J.
Photovoltaic (PV) systems are an excellent solution to meet energy demand and protect the global environment in many cases. With the increasing utilization of the PV system worldwide, there is an increasing need for simulation tools to predict the PV system’s performance and profitability. This research includes testing and comparison of PV tools: photovoltaic geographical information system (PVGIS), PVWatts, SolarGIS, RETScreen, BlueSol, PVsyst, HelioScope, PV*SOL, Solarius PV, Solar Pro, PV F- ...
Chemical Industry and Chemical Engineering Quarterly
(Association of Chemical Engeneers of Serbia)
• 24 Jan 2019
Jovanović, Slaviša • Jovanović, Vojislav • Marković, Gordana • Samaržija-Jovanović, Suzana • Milićević, Zoran • Marinović-Cincović, Milena • Budinski-Simendić, Jaroslava
The elastomeric materials based on NR/BR/SBR ternary rubber blend were investigated. The polyisoprene (NR), butadiene (BR) and styrene butadiene (SBR) rubbers were used as network precursors and carbon black (CB) as an active filler (60 phr) for elastomeric materials preparation. For sample preparation, the mass ratio of NR to BR was constant, 1:1, but the SBR content was varied from 0 to 80 phr. The morphological, mechanical and thermal properties of prepared elastomeric materials were determin ...
ELEKTRONIKA IR ELEKTROTECHNIKA
(Kaunas University of Technology)
• 27 Oct 2020
Perić, Zoran • Marković, Aleksandar • Kontrec, Nataša • Panić, Stefan • Spalević, Petar
This paper, by using Borjesson’s and Benitez’s approximation of Q-function, presents a novel and improved composite approximation of Q-function with wide applicability. The presented approach is very general and can be implemented on any observed interval. Based on the proposed approximation of Q-function, the average bit error rate is assessed by observing the transfer over Nakagami-m fading channel. The simplicity of the proposed approximation form in conjunction with yet another feature - utm ...
Tehnički vjesnik / Technical Gazette
(Strojarski fakultet u Slavonskom Brodu; Fakultet elektrotehnike, računarstva i informacijskih tehnologija Osijek; Građevinski i arhitektonski fakultet Osijek)
• 25 Jul 2019
Контрец, Наташа • Петровић, Милена • Панић, Стефан • Милошевић, Хранислав
The aim of this paper is to set framework for the repair rate in order to achieve required availability of a repairable system with alternating renewal process where the failure rate is Weibull distributed. In order to accomplish this goal, this paper proposes a novel model for a complete stochastic analysis of the repair rate. The resulting equation for probability density function of the repair rate enables precise modelling of the repair rate process for related values of availability and fai ...
REVUE ROUMAINE DES SCIENCES TECHNIQUES-SERIE ELECTROTECHNIQUE ET ENERGETIQUE
• 01 Apr 2024
Marković, Aleksandar • Perić, Zoran • Panić, Stefan • Spalević, Petar
In this paper, an approximation of the average bit error rate (ABER) probability expression, standard performance measure of wireless transmission over fading channels using linear spline functions with corresponding number of segments has been provided. Further, possible approximation improvement obtained by appliance of composite piecewise spline (combination of linear and quadratic) functions has also been analyzed. For the generality purpose multipath fading that occurs through the propagati ...
IDŐJÁRÁS
(Hungarian Meteorological Service)
• 08 Mar 2022
Milentijević, Nikola • Valjarević, Aleksandar • Bačević, Nikola • Ristić, Dušan • Kalkan, Kristina • Cimbaljević, Marija • Dragojlović, Jovan • Savić, Stevan • Pantelić, Milana
Climate change is one of the largest environmental issues causing hydroclimatological extremes such as floods, droughts, and aridity. The aim of this study is to assess the observed and projected climate changes in Bačka (Serbia). Detailed trend analyses and possible climate scenarios over Bačka has not been presented up to now. In this paper, four data sets were extracted and calculated: mean annual air temperature, mean air temperatures during the vegetation period, mean annual precipitation a ...
Idȍjárás-Quarterly Journal of the Hungarian Meteorological Service
• 20 Jun 2021
Бачевић, Никола • Милентијевић, Никола • Ваљаревић, Александар • Гицић, Ајша • Кићовић, Душан • Радаковић, Милица • Николић, Милена • Пантелић, Милана
The paper presents trends for three categories of variables: average annual, average maximum and average minimum air temperatures. Data was provided by the meteorological yearbooks of the Republic Hydrometeorological Service of Serbia. The main goal of this paper is to detect possible temperature trends in Central Serbia. The trend equation, trend magnitude, and Mann-Kendall non-parametric test were used in the analysis of climate parameters. The used statistical methods were supplemented by GIS ...
Polish Journal of Environmental Studies
• 01 Oct 2021
Милентијевић, Никола • Остојић, Милош • Фекете, Рената • Калкан, Кристина • Ристић, Душан • Бачевић, Никола • Стевановић, Владица • Пантелић, Милана
Soil erosion assessment enables the identification of manifested soil erosion categories, their spatial distribution and the relationship between soil erosion and land use patterns. The integrated approach of the RUSLE method and GIS tools was used in estimating soil erosion rates in Bačka (Serbia). Previous research of soil erosion intensity in the study area was last performed 50 years ago. The spatial distribution of the calculated erosive factors shows the diversity of erosive conditions. Th ...
Open Geosciences
• 28 May 2021
Ваљаревић, Александар • Радовановић, Драган • Шошкић, Светислав • Бачевић, Никола • Милентијевић, Никола • Голијанин, Јелена • Ивановић, Марко
This paper points out the possibilities of better exploitation of marine traffic as well as its connection with other kinds of traffic. Special attention is given to the analysis of 1,081 harbors about their availability during the year. The methods and algorithms used in GIS are buffers, cluster, method of interpolations, and network analysis. The methods used for the purpose of conducting numerical analyses are algorithms that served for the analysis of the network, its transport features, and ...
