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Dragana Valjarevic

Dragana Valjarevic
University of Priština in Kosovska Mitrovica

PhD

About

60
Publications
5,574
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251
Citations
Citations since 2017
30 Research Items
216 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (60)
Article
We consider the statistical concept of causality in continuous time within filtered probability spaces based on Granger’s definition of causality. The given causality concept is connected to the optional and predictable processes important in stochastic integration. More precisely, we establish that the preservation of predictability with respect t...
Article
Full-text available
Adequate disposal of municipal solid waste (MSW) is one of Serbia’s most complex environmental challenges. The problem is more serious in urban areas, since large amounts of waste are disposed of in locations that do not comply with environmental, technical, and socio-economic standards. Such is the case for the city of Kraljevo, where about 116,00...
Article
Full-text available
Given the widespread use of dietary supplements (DS) and herbal products (HP), healthcare professionals (HCPs) will increasingly encounter patients who use these preparations with conventional drugs and who need their services to reduce the consequences of adverse therapeutic outcomes. The aim of our survey was to assess the knowledge and behaviors...
Article
Full-text available
We propose an improved variant of the accelerated gradient optimization models for solving unconstrained minimization problems. Merging the positive features of either double direction, as well as double step size accelerated gradient models, we define an iterative method of a simpler form which is generally more effective. Performed convergence an...
Article
In a fast growing region of Middle East and with rapid depletion of fossil groundwater, possibilities for dew utilization as a limited renewable water resource play an important role in the water management of the United Arab Emirates. Despite projected changes in air temperature and rainfall, geographical and topographical features of the UAE show...
Article
Full-text available
Abstract Serbia is a country rich in geoheritage with eighty geomorphological sites now under protection. Although a canyon, the site of Devil’s Town is a unique geomorphological site in Serbia and deserves special attention. The geotouristic values of Devil’s Town were assessed based on the analysis of its present state and comparison with three s...
Article
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...
Article
Full-text available
In December 2019, the virus SARS-CoV-2 responsible for the COVID-19 pandemic was detected in the Chinese city of Wuhan. The virus started to spread from China and dispersed over the rest of the world. In March 2020, WHO (World Health Organization) declared COVID-19 a pandemic. The transmission path of the pandemic was accelerated by different types...
Article
Full-text available
With the help of satellite data and numerical GIS methods, the total capacity of dew volume on the entire territory of the Republic of Serbia was estimated. Multi-criteria GIS analysis and satellite detections with the support of methods such as Kriging and semi-Kriging gave satisfactory results in this research. After the download of satellite dat...
Article
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...
Article
Full-text available
We introduce a hybrid gradient model for solving unconstrained optimization problems based on one specific accelerated gradient iteration. Having applied a three term hybridization relation on transformed accelerated double step size model, we develop an efficient hybrid accelerated scheme. We determine an iterative step size variable using Backtra...
Article
Full-text available
The subject of this paper is to present an investigation of renewable energy potential in one small municipality in south Serbia. Serbia has a relatively small area but a large number of renewable energy resources. This energy is divided into solar, wind, geothermal and waste wood. One municipality on the south east has very large potential for the...
Article
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 term of statistical causality, for the space Lp(Ω,G∞,P) to be separable. The...
Article
Full-text available
With the help of satellite data and numerical geographical information system (GIS) methods, the total capacity of dew volume on the entire territory of the Republic of Serbia was estimated. Multicriteria GIS analysis and satellite detections with the support of methods such as kriging and semi-kriging gave satisfactory results in the present resea...
Article
Full-text available
New Updated World Maps of Sea-Surface Salinity Abstract—Sea surface salinity presents one of the most important chemical elements in the water. Climatic variables, included in new view of salinity distribution at a global scale, were used in this research. For the purpose of this research newly updated climate parameters for the period until 2100...
Article
Full-text available
Concept of causality is very popular and applicable nowadays, especially when we consider the cases 'what would happen if' and 'what would have happened if'. Here we consider the concept of causality based on the Granger's definition of causality, introduced in Mykland (1986). Many of the systems to which it is natural to apply tests of causality t...
Article
Full-text available
In this paper, we investigated the connection between the Holy Bible texts and climate changes. Also, for the texts from Bible (Old Testament) about time, space, energy, climate and climate changes, a scientific interpretation is obtained. By the today's prognosis scientists share the opinion that the climate changes may destroy the civilization on...
Article
Full-text available
We studied the geospatial distribution of health facilities in Belgrade, the capital of the Republic of Serbia, in relation to the public transport system. Analyses in this research were based on advanced geographical information systems using numerical methods. We calculated accessibility to health centres as based on public transport properties a...
Article
Full-text available
We studied the geospatial distribution of health facilities in Belgrade, the capital of the Republic of Serbia, in relation to the public transport system. Analyses in this research were based on advanced geographical information systems using numerical methods. We calculated accessibility to health centres as based on public transport properties a...
Article
There are about 240 geothermal occurrences with 60 commercial spas included in, which are spread throughout the territory of Serbia. The majority of springs and other surface manifestations are located along the south-eastern edge of the country. Three spas Lukovska, Prolom and Kursumlijska are with the highest geothermal potential and balneology u...
Article
Full-text available
In this paper we consider the concept of statistical causality between filtrations associated with stopping times, which is based on Granger’s definition of causality. Especially, we consider a generalization of a causality relationship ”G is a cause of E within H” from fixed to stopping time. Then we apply the given causality concept to local uniq...
Conference Paper
Full-text available
In this paper we consider a statistical concept of causality in continuous time, between filtered probability spaces, which is based on Granger's definition ([1]) of causality. On the other side, concept of martingale problem was first introduced by Stroock and Varadhan in [2]. Martingale problems should be considered as a stochastic counterpart of...
Article
In this paper we consider the concept of statistical causality in continuous time between flows of information, represented by filtrations. Then we relate the given concept of causality to the equivalent change of measure that plays an important role in mathematical finance. We give necessary and sufficient conditions, in terms of statistical causa...
Article
Full-text available
Abstracts Background The ready availability and use of dietary supplements (DS) by the public means that healthcare professionals require education in this area. In the Republic of Serbia, education related to use of DS is included in undergraduate medical training and it is therefore important to assess the effectiveness of this education. The aim...
Article
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...
Article
Full-text available
It is well known that there is a relationship between the zinc and diabetes, and its antioxidant potential. Based on that, the aim of this paper is to investigate the effects of different doses of zinc (9,2 and 18,4 mg / day) in combination with metformin and gliben-clamide, to the total antioxidant status (TAS) and the activity of the enzyme super...
Article
Full-text available
The goal of this study is to reveal possible influence that the participants' age and Information and Communications Technologies (ICT) usage in the instruction process can have on behavior that defines whether students and teachers belong to one of the Digital Native/Immigrant or Visitor/Resident groups. We collected data through two surveys that...
Article
We consider causality relationships between σ-fields (filtrations) associated by stopping times, which can be applied to the stopped processes. These results are motivated by the causality relationship between filtrations “(\( \mathcal{G} \) t) is a cause of (ℋt) within (ℱt)” and which is based on Granger’s definition of causality. Then we give som...
Article
Full-text available
In this paper we consider a statistical concept of causality in continuous time in filtered probability spaces which is based on Granger's definitions of causality. The given causality concept is closely connected to the preservation of the property being a local martingale if the filtration is getting larger. Namely, the local martingale remains u...
Chapter
The paper considers a statistical concept of causality in continuous time between filtered probability spaces which is based on Granger’s definition of causality. Then, the given causality concept is connected with a local weak solutions of the stochastic differential equations driven with semimartingales. Also, we establish connection between the...
Conference Paper
Full-text available
In this paper we consider different concepts of causality in filtered probability spaces. Especially, we consider a generalization of a causality relationship " G is a cause of J within H " which was first given by Mykland (1986) and which is based on Granger's definition of causality (Granger, Econometrica,1969). Then we apply this concept on weak...
Article
The paper considers a statistical concept of causality in continuous time between filtered probability spaces, based on Granger's definition of causality. This causality concept is connected with the preservation of the martingale representation property when the filtration is getting smaller. We also give conditions, in terms of causality, for eve...
Article
Full-text available
The monitoring of the territory of Prokuplje Municipality was done based on 1:25,000 topographic maps in three different time periods (1969, 1974, 1984) and land cover map in 2012. Analogous topographic maps done in 1969, 1974 and 1984 were used, while in 2012 the land cover map obtained by using CORINE-like approach was used. Topographic maps are...
Article
Full-text available
The paper considers a statistical concept of causality in continuous time in filtered probability spaces which is based on Granger's definitions of causality. Then, the given causality concept is applied to regular solutions of stochastic differential equations. We show the equivalence between some models of causality and weak uniqueness (for weak...
Article
In this paper we consider the statistical concept of causality in continuous time between filtered probability spaces, based on Granger's definitions of causality. Then we consider some stable subspaces of H p which contain right continuous modifications of martingales P(A Gt). We give necessary and sufficient conditions, in terms of statistical ca...
Article
Full-text available
In this work we consider the concept of statistical causality between filtrations, and in particular a generalization of the causality relationship “G is a cause of J within Hâ€. Then we apply this concept to strongly orthogonal martingales. We show the equivalence between the concepts of causality and orthogonality of local martingales. The orth...
Article
Full-text available
All the elements of water balance including precipitation are connected with soil. Some natural laws, which are a result of external (climate, relief) and internal (geological structure, thickness) natural factors, influence the leachate water to be transformed into surface outflow, infiltration, evaporation and subsurface runoff. M. I. Ljvovic has...
Article
Full-text available
1 1 2 3 4 1 3 Ñòàíî¼åâèž Ç. , Mèòèž Ð. , Ñòàíèž Ì. , Ìèëåòèž Ì. , Âàšàðåâèž Ä. , ÕàŸèñòåâèž Ñ. , Äå¼àíîâèž Ì. 1 Èíñòèòóò çà ôàðìàêîëîãè¼ó è òîêñèêîëîãè¼ó, Meäèöèíñêè ôàêóëòåò Ïðèøòèíà, Koñîâñêà Ìèòðîâèöà 2 Áèîõåìè¼ñêî-êëèíè÷êà ëàáîðàòîðè¼à, Çäðàâñòâåíè öåíòàð Êîñîâñêà Ìèòðîâèöà 3 Èíñòèòóò çà ôèçèîëîãè¼ó, Meäèöèíñêè ôàêóëòåò Ïðèøòèíà, Koñîâñêà Ìèòðî...
Article
Full-text available
1 1 2 3 Станојевић З. , Mитић Р. , Станић М. , Ваљаревић Д. 1 Институт за фармакологију и токсикологију, Meдицински факултет Приштина, Koсовска Митровица, Србија 2 Биохемијско-клиничка лабораторија, Здравствени центар Косовска Митровица, Србија 3 Oдсек за математику, Природно-математички факултет Приштина, Koсовска Митровица, Србија САЖЕТАК Тrace e...
Article
Full-text available
In this paper we consider different concepts of causality in filtered probability spaces. Especially, we consider a generalization of a causality relationship “G is a cause of J within H ” which was first given by Mykland (1986) and which is based on Granger’s definition of causality (Granger, Econometrica 37:424–438, 1969). Then we apply this conc...
Article
Full-text available
1 1 2 3 1 Ñòàíî¼åâèž Ç. , Mèòèž Ð. , Íåñòîðîâèž Â. , Âàšàðåâèž Ä. , ÕàŸèñòåâèž Ñ. 1 Èíñòèòóò çà ôàðìàêîëîãè¼ó è òîêñèêîëîãè¼ó, Meäèöèíñêè ôàêóëòåò Ïðèøòèíà, Koñîâñêà Ìèòðîâèöà 2 Èíñòèòóò çà ôèçèîëîãè¼ó, Meäèöèíñêè ôàêóëòåò Ïðèøòèíà, Koñîâñêà Ìèòðîâèöà 3 Oäñåê çà ìàòåìàòèêó, Ïðèðîäíî-ìàòåìàòè÷êè ôàêóëòåò Ïðèøòèíà, Koñîâñêà Ìèòðîâèöà SA@ETAK The comb...
Conference Paper
Full-text available
The paper introduces a statistical concept of causality in continuous time in filtered probability spaces which is based on Granger’s definition of causality. We consider the stochastic differential equation driven with a process of Brownian motion and show the equivalence between some models of causality and weak uniqueness (for weak solutions of...

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Projects

Projects (2)
Project
Primary goal of this project is to find new mathematical models for solving of optimized problems in wide range and their application in stochastic analysis, theory of generalized inverses and theory of fixed point. It is also, expected that the results of this project should be applied in different industrial fields.
Archived project
Generalization of the notion of median in multivariate distributions, concepts analogous to moments (iterated medians). Convexity with applications in probability and statistics. Stability of characterization of the uniform distribution. Asymptotic behavior of moments of power series distributions, generated by entire functions of finite order and having a regularly varying logarithm of maximum of the modulus. Reliability of three-unit system with repair and with different kinds of preventive maintenance, simulation, limit theorems for quick repair and quick preventive maintenance. Continuous stochastic processes of second order in a separable Hilbert space. Conditions for equivalence, spectral type and multiplicity. Stochastic models. Wiener process, martingales, stochastic differential equations and applications in financial mathematics and biology. Causality relations between stochastic processes and families of sigma algebras