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700 items

  • Uticaj reaktiviranih raseda na razvoj kraškog procesa: primeri iz Karpato-balkanida istočne Srbije

    Ana Mladenović (2022)
    Carpatho-Balkanides represent part of the complex Dinaric - Carpatho - Balkan orogenic system, that geomorphologically dominates the central part of the Balkan peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic. The main aim of this research is ...
    Karpato-balkanski orogen, reaktivirani rased, speleološki objekat, kraški proces

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... of Mining and Geology [11]. The Faculty started with this implementation by developing its own FMG CMS (Course Management System) as the core of the blended learning system at FMG. In 2009, following an initiative of a number of teachers and teaching assistants, the introduction of Moodle FMG CMS ...
    ... terms has been recognized several years ago. Namely, various applications developed in this area followed by the development of an information system for planning, monitoring and management of mine exploitation, indicated that such resources would greatly contribute to their functionality [5]. ...
    ... becoming the reference resource for mining terminology in Serbian in e-format. RudOnto is presently implemented within a mining engineering information system, which has previously also been developed at FMG. Although it has reached a considerable size to date, it is still being intensively enlarged and ...

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... The course participant will become familiar with the use of Unitex, the corpus processing system for which many valuable resources for Serbian have already been developed. Unitex 11 is an open source system consisting of a collection of programs developed for text analysis by using linguistic ...
    ... linguistics and computer scientists developing NLP applications. The participant will become familiar with the use of Unitex, the corpus processing system for which many valuable resources for Serbian were already developed. This course covers a broad range of topics such as pattern recognition using ...
    ... project of its OER version within the edX BAEKTEL platform. 2 The main features of Unitex, an open access and open source corpus processing system, are presented in Section 4. Section 5 presents course content with didactic criteria and specific formats used in the OER course. Concluding ...

  • A WordNet Ontology in Improving Searches of Digital Dialect Dictionary

    Miljana Mladenović, Ranka Stanković, Cvetana Krstev (2017)
    In this paper, we present a method for automatic generation of a digital resource, which connects all indirect synonyms of a dialect term to all indirect synonyms of a corresponding term in the standard language, aiming to improve the search of a digital dialect dictionary. The method uses SWRL rules defined in the Serbian WordNet ontology to identify sets of synonymous words. It also uses e-dictionaries to produce correct lemmas in standard language that users usually employ in searches. ...
    ... 897. Table 1. The confusion matrix of the process deciding whether dictionary entries are correctly aligned with standard language entries. System Yes | System No Expert yes tp = 3022 fn = 436 Expert no fp=0 tn = 784 We can notice that the proposed method is completely precise, but the prob- lem with ...
    ... classification, compared results obtained from the system with data provided by humans. The accuracy measure was acc=89.7%. In future work, we will experi- ment with other parts of speech and we will try to expand the set of ontological rules used in this system. View publication statsView publication stats ...
    ... for search. The method was applied and evaluated on verbs and a group of nouns derived from verbs (verbal nouns). We compared results obtained by the system with those produced by humans and achieved the accuracy of 89.7%. Keywords: dialect dictionary, ontology, WordNet, e-dictionary, South Serbian dialect ...

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... les/2015-07/documents/emission-factors_2014.pdf https://www.ecoinvent.org/database/system-models-in-ecoinvent-3/system-models-in-ecoinvent-3.html https://www.ecoinvent.org/database/system-models-in-ecoinvent-3/system-models-in-ecoinvent-3.html ...
    ... -07/documents/emission- factors_2014.pdf (accessed 25 Sept. 2020.) [24] Ecoinvent, Ecoinvent 3.0. System Models in ecoinvent 3.https://www.ecoinvent.org/database/system-models-in-ecoinvent-3/system- models-in-ecoinvent-3.html (accessed 30 Sept. 2020). https://www.pre-sustainability.com/legacy ...
    ... Dejan Ivezić. Marija Živković 430 However, since LCA considers the environmental aspects and the potential impacts of a product or a service system throughout its life, it becomes a very useful method for researching studies related to the problem of sustainable development, cleaner production ...

  • The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector

    Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković (2020)
    Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...
    energetska bezbednost, prirodni gas, fazi AHP, AHP višekriterijumska analiza, fazi teorija
    ... Availability of energy System availability index (N-1) indicating the daily operational flexibility, which describes the daily operational flexibility of the gas pipeline system, as well as the ability of the system to respond to consumption requirements in extreme conditions. System availability index ...
    ... distribution and distribution system operation are performed by 32 licensed distribution system operators. Most of them are owned by municipalities and towns, some of them are public-private partnership, and some of them are private companies [71]. The current transmission system has the capacity to transport ...
    ... level of availability of the natural gas (S1) can be accessed by the (N-1) system availability index [2]. N-1 index describes the daily operational flexibility of the gas pipeline system, as well as the ability of the system to respond to consumption requirements in extreme conditions and it is calculated ...

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... partners from industry [5]. The idea of the project was to establish a system for creating, publishing, maintaining and searching of OERs both from academic institutions and enterprises. An important part of this system is the Open edX platform, which was adapted for the needs of BAEKTEL project ...
    ... required, which http://tpack.org/ inform the system that there is a mathematic formula (Image 5). MathJax presents a cross-browser JavaScript library that displays mathematical notation in web browsers using LaTex document preparation system. Image 5: Example of tasks editing ...
    ... progress [6]. Experts stress the importance of using TPACK framework (Image 4) in creating mathematical content. TPACK has been presented as a system which interconnects and intersects technology, pedagogy, and content knowledge [7]. According to this model technological knowledge has an important ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Hypogene karst associated with igneous intrusions and its influence on the subsequent karst evolution in high mountains (Central Andes, Peru)

    Alexander B. Klimchouk, Saša Milanović, Cristian Bittencourt (2021)
    Carbonate rocks of Cretaceous age are wide spread in the Peruvian Andes. The studied area in the eastern part of the Cordillera Occidental, near a large igneous intrusion and a skarn deposit, exemplifies polygenetic and multi-phase karst development. Hypogene karstification is related to a hydrothermal activity associated with a magmatic event at ca. 11-9.7 Ma responsible for the emplacement of the nearby intrusion and related alteration of the carbonate rocks. It has resulted in deep-rooted, laterally isolated stair-case-rising shaft ...

  • Applying the Fuzzy Inference Model in Maintenance Centered to Safety: Case Study – Bucket Wheel Excavator

    Predrag Jovančić, Miloš Tanasijević, Vladimir Milisavljević, Aleksandar Cvjetić, Dejan Ivezić, Uglješa Bugarić (2020)

  • Hidrodinamički proračun zaštite površinskog kopa Drmno od podzemnih voda u periodu 2018-2022. godina

    Dušan Polomčić, Tomislav Šubaranović, Zoran Stojićević (2019)
    Površinski kop lignita Drmno nalazi se u blizini velikih reka (Dunav i Mlava), zbog čega eksploatacija otkrivke i lignita u velikoj meri zavisi od sistema zaštite od podzemnih voda. Ukoliko je sistem zaštite od podzemnih voda dobro isplaniran, a njegov kapacitet dobro proračunat, onda će se eksploatacija obavljati u suvoj sredini, što podrazumeva sigurnu proizvodnju otkrivke i lignita. U današnje vreme uz primenu adekvatnih softvera olakšano je kvalitetno planiranje i proračunavanje sistema za zaštitu površinskih kopova od podzemnih voda. ...
    odvodnjavanje, podzemne vode, površinski kop, lignit, Drmno

  • Challenges in using wastewater heat pumps in district heating systems

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović, Dimitrije Manić (2022)
    Decarbonization of district heating systems requires ensuring significant amounts of renewable energy available in the proximity of the district heating network. One of the promising solutions is the utilization of purified water from wastewater treatment plants by heat pumps. However, as a heat source, wastewater treatment plants are characterized by annual variability of the flow and temperature of purified water. The consequence is the variability of recoverable heat potential. In this paper, the effect of variability is analyzed for ...
    Toplotna pumpa, Daljinsko grejanje, Postrojenje za prečišćavanje otpadnih voda

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... includes linguistic variables based on available information about the considered engineering system [17]. A definition of structure and interdependence of linguistic variables is carried out in a coordinate system of membership function (µ), with regard to j-class as a synonym of measurement for the observed ...
    ... includes linguistic variables based on available information about the considered engineering system [17]. A definition of structure and interdependence of linguistic variables is carried out in a coordinate system of membership function (μ), with regard to j-class as a synonym of measurement for the observed ...
    ... April 2015. 27. Aliyev, E. Development of Expert System for Artificial Lift Selection. Master’s Thesis, Middle East Technical University, Ankara, Turkey, February 2013. 28. Bowles, J.B.; Peláez, C.E. Fuzzy logic prioritization of failures in a system failure mode, effects and criticality analysis. ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... is used [2, 5]. Life cycle of a machine, facility or any other technical system has a complex structure, and it encompasses several distinctive but interrelated and timely adjusted groups of activities. Technical system is used only during one part of own life cycle, therefore, time it is used is ...
    ... machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity ш таноп ој the continuous system јог the excavatioh ој coal апа tailings, which indicafes their importance. More than 100 bulldozers have been hired оп the ореп-сазт lignite mines ...
    ... machines (bucket wheel excavators, belt conveyors and stackers). It also should be noted that one hour of bucket wheel excavator — belt conveyor — stacker system operation is valued at several thousands of euros, and that value on one hour of dozer operation is below 100 €. Hence, it is more important that open-cast ...

  • Challenges of Energy Transition in the Individual Heating Sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2022)
    U radu su prikazani rezultati istraživanja i ankete koja je sprovedena 2020. godine u domaćinstvima sa individualnim sistemima grejanja u Srbiji. Cilj ankete je bio da se sagleda stanje individualnih sistema grejanja, ali i stavovi vlasnika sistema vezano za energetsku tranziciju. Rezultati ukazuju na zastarelost sistema grejanja, nisku efikasnost, nedovoljna ulaganja u primenu mera energetske efikasnosti i nedostatak finansijskih sredstava za ulaganje u održivo grejanje. Osnovni prioriteti kod izbora načina grejanja jesu troškovi kupovine sistema i troškovi energenta, dok ...
    Energetska tranzicija, Individualni sistemi grejanja, Stavovi domaćinstava, Anketa, Srbija

  • Against the tide: southeast to northwest shelf-edge progradation in the southeastern margin of Lake Pannon, Banat (Serbia and Romania)

    Dejan Radivojević, Miloš Radonjić, Lajos Tamás Katona, Imre Magyar (2022)
    In the late Neogene, the Pannonian Basin in Central Europe was filled with sediments when rivers from the Alps and Carpathians shed their sediment load into Lake Pannon. The most powerful source-to-sink system was that of the paleo-Danube, transporting sediments from the NW as far as the southeastern part of the lake. In the southeastern margin of the basin, however, local sedimentary systems worked in the opposite direction, against the “tide” of the prevailing N to S sediment transport. ...
    General Earth and Planetary Sciences

  • To what extent reactivated faults are (not) responsible for karst process: example from Serbian Carpatho-Balkanides?

    Ana Mladenović, Jelena Ćalić (2023)
    Carpatho-Balkanides represent part of the complex Dinaric – Carpatho – Balkan orogenic system, that geomorphologically dominates the central part of the Balkan Peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic times. The main aim of this work ...
    Carpatho-Balkanides, karst caves, reactivated faults, transpressional tectonics

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS