Andjelic G.,Educons University |
Djakovic V.,University of Novi Sad
Acta Polytechnica Hungarica | Year: 2012
This paper tests and analyses the interdependence of financial markets in the transition economies of Serbia, Hungary, Croatia and Slovenia, as well as the similarity of these markets with the US financial market. The source of information is the data obtained from the financial markets of these countries in the form of stock-market indices for the period 05.10.2005-30.09.2011. The main hypothesis to be tested in the work is the assumption that there is a significant level of similarity between these financial markets. The methodology used in the study includes statistical methods of sampling and factor analysis. The research results confirm the hypothesis, which was tested in the work, that there are significant levels of similarity between the financial markets of transition economies, both among each other and with the US market.
Rudas I.J.,Obuda University |
Pap E.,Obuda University |
Pap E.,University of Novi Sad |
Pap E.,Educons University |
Fodor J.,Obuda University
Knowledge-Based Systems | Year: 2013
This paper offers a comprehensive study of information aggregation in intelligent systems prompted by common engineering interest. After a motivating introduction we consider aggregation functions and their fundamental properties as a basis for further development. Four main classes of aggregation functions are identified, and important subclasses are described and characterized as prototypes. For practical purposes, we outline two procedures to identify aggregation function that fits best to empirical data. Finally, we briefly recall some applications of aggregation functions in decision making, utility theory, fuzzy inference systems, multisensor data fusion, image processing, and their hardware implementation. © 2012 Elsevier B.V. All rights reserved.
Stojadinovic S.,University of Belgrade |
Vasilic R.,Educons University |
Petkovic M.,University of Belgrade |
Zekovic L.,University of Belgrade
Surface and Coatings Technology | Year: 2011
This article is a review of our recent research of plasma electrolytic oxidation (PEO) process of titanium in heteropolytungstate acids (12-tungstosilicic acid and 12-tungstophosphoric acid). It has been detected that spatial density of microdischarges is the highest in the early stage of the PEO process, while the percentage of oxide coating area covered by active discharge sites decreases with PEO time. The elements and their ionization stages present in PEO microdischarges are identified using optical emission spectroscopy technique. The spectral line shape analysis of hydrogen Balmer line Hβ (486.13nm) indicates presence of two types of microdischarges during PEO. The discharges are characterized by relatively low electron number densities of Ne≈0.8×1015cm-3 and Ne≈2.1×1016cm-3. Oxide coatings formed by PEO process were characterized by AFM, SEM-EDX and XRD. The elemental components of PEO coatings are Ti, W and O. The oxide coatings are partly crystallized and mainly composed of WO3 and anatase. © 2011 Elsevier B.V.
Filipovic S.,Economics Institute |
Golusin M.,Educons University
Journal of Cleaner Production | Year: 2015
Main problem addressed in this paper is assessment of quality of current methodologies for expressing environmental tax revenue, since measurements' outcomes have significant influence on the future environmental policies and legislation. The main goal of this paper is to analyze the existing way of measuring financial effects of environmental taxation in EU27 and propose new methodology approach, based on use of ETE - Environmental Taxation Efficiency as a new indicator suggested by authors. The first phase of the study involves the analysis of quality of measuring two existing methodologies (based on the use of GDP and total revenues). In second research stage, the authors apply the newly proposed methodology for determining a composite ETE indicator that, apart from existing indicators, takes into account the environmental taxation effects per capita, as an indicator unjustifiably neglected in previous methods of measuring. Measurement of environmental taxation by using a newly-proposed composite indicator shows significant differences in ranking compared to two current methodologies in use. Only 6 countries showed a very similar rank, regardless of the methodology applied. Differences by more than ten ranking positions were found in 12 countries. The overall results showed significant differences in ranking of all EU-27 countries by using all four indicated methodologies, which clearly points to the conclusion that further improvements are needed. ETE methodology limits predominant role of GDP and introduces a social component which should serve as a basis for further development of a unique methodology for establishing efficient environmental taxation implementation. © 2014 Elsevier Ltd. All rights reserved.
Strbac S.,Educons University
Journal of Environmental Protection and Ecology | Year: 2011
Simultaneously with science, technique and technology development, we have witnessed a rapid development of society, urbanisation and demographic explosion. All these things caused intensive use of natural resources, damage of biosphere and its ecosystems, large amounts of waste and people health deterioration. A possible solution for this situation lies in environmental education and upbringing. The development of the proper relation towards the nature should start as early as in preschool institutions. For that reason, this paper theoretically analyses the position of environmental education and upbringing in the system of preschool education in the Republic of Serbia. In order to establish the position of environmental education and upbringing in the system of preschool education, this research covers: the analysis of the share of environmental contents in the preschool curriculum, as well as the analysis of the Curriculum of Preschool Teacher Training College, in order to see if they are qualified to fulfill the content requirements in their work with children. The scientific contribution of this type of research is mostly in its suggestions for improving environmental education and upbringing, not only in the Republic of Serbia, but also in other countries.