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Упит dcterms_creator_txt:Teodorović A.

1567 items

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)
    ... 15 20 25 30 35 40 fi n g e rs fo re a rm h a n d s h o u ld e r u p p e r a rm e y e fa c e h e a d ( o th ) a n k le fo o t k n e e s h a n k th ig h to e o th e r p a rt to rs o ( o th ) in te r. o rg a n s arm head leg torso 5 3 9 1 18 6 2 ...
    ... languages are linked, usually by a list of term pairs. Terminological resources featuring a hierarchy are taxo- nomies. If richer semantic relations exist between con- cepts, the terminological resource becomes either a thesaurus or an ontology. While opinions exist that a clear boundary between the ...
    ... 2012). One of the means to secure interoperability within a specific domain is the use of ontologies, containing a comprehensive common domain vocabulary. In other words, all terms used within a domain need to be standar- dized, with a clear and unambiguous definition, accompa- nied by lexical ...

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN
    ... achieved at a pH of 6.20. Increasing the pH to 7.20 leads to a sharp decrease in chalcopyrite recovery to 38.82%. A further increase in the pH to 8.20 leads to a sharp increase in the recovery of chalcopyrite to 72.24%, which is the second maximum. Increasing the pH value to 9.20 leads to a sharp decrease ...
    ... of the magnetic stirrer. In flotation experiments, a reagent from the xanthate group, potassium amyl xanthate (KAX), was used as a collector. Sodium cyanide (NaCN) reagent was used as a depressant. Aqueous solutions of these reagents, at a concentration of 1 g/L, were added to the flotation cell ...
    ... - Flotability of chalcopyrite as a function of pulp pH, at a consumption of KAX of 4 mg/L pH Recovery [%] 6.20 96.21 7.20 64.56 8.20 87.90 9.20 86.06 10.20 68.37 Figure 3 - Flotability of chalcopyrite from"Rudnik" mine as a function of pulp pH, at a consumption of KAX of 4 mg/L ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic
    ... ery failure Dejan V. Petrović a,∗, Miloš Tanasijević b, Saša Stojadinović a, Jelena Ivaz a, Pavle Stojković a a University of Belgrade, Technical Faculty in Bor, VJ 12, Bor, Serbia b University of Belgrade, Faculty of Mining and Geology, Djusina 7, Belgrade, Serbia a r t i c l e i n f o Article history: ...
    ... significance of severity of a failure as a risk indicator especially in mining sector. Consid- ering the failure severity through negative effects of a machine failure provides the higher reliability of a risk assessment model. The ultimate goal of this research is a development of a risk assessment model ...
    ... failure is a complex task that includes a number of causes and effects pertaining to a risky event, based on which conclusions about the observed phenomenon can be drawn. The risk of mining machinery failure is always present, es- pecially in industrial systems that have been in use for a long time. ...

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials
    ... (i) find a set A of local minimum points, a set B of local maximum points, and a set S of (horizontal inflection) stationary points on [−1, 1] of Q (x); (ii) find a set A of fractional parts of values at local minimum points, a set B of fractional parts of values at local maximum points, and a set S ...
    ... in R/Z. A Pisot number is a real algebraic integer greater than 1 whose other conjugates have modulus less than 1. A Salem number is a real algebraic integer greater than 1 whose other conjugates have modulus less than or equal to 1 and a conjugate with modulus one. It is easy to see that a E-mail ...
    ... distribution modulo 1 of the sum of powers of a Salem number Sur la répartition modulo 1 de la somme des puissances d’un nombre de Salem Dragan Stankov Katedra Matematike RGF-a, University of Belgrade, Beograd, Ðušina 7, Serbia a r t i c l e i n f o a b s t r a c t Article history: Received 1 February ...

  • Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian

    Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek (2021)
    slogovi, distribucija rang-preciznost, slovenski jezici
    ... end a�er their nuclei, i.e., a�er a vowel or a syllabic consonant. �e maximum onset principle is ‘blindly’ respected in this step, and thus, preliminarily, all syllables (the last syllable in a word being a possible exception, as it must contain its coda if there is one) are kept open. If, a�er the ...
    ... tant role,1 and a re-analysis of their data, with word length expressed in syllables, could lead to a stronger correlation. 1. Köhler (2012: 108) writes, albeit in a slightly di�erent context, that “an indirect relationship … is a good enough reason for more variance in data and a weaker �t” – in ...
    ... syllable contains a nucleus (a vowel or a syllabic consonant), we �rst had to solve the problem of zero-syllabic words (each of them consisting of one non-syllabic consonant) which occur in all the languages we work with (prepositions, and in the case of Ukrainian also two particles and a conjunction) ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • Long-term planning methodology for improving wood biomass utilization

    Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković (2019)
    The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...
    Long-term planning methodology, Forest biomass, MINLP, Backcasting
    ... Vukasinovic a, Dusan Gordic a, *, Marija Zivkovic b, Davor Koncalovic a, Dubravka Zivkovic a a University of Kragujevac, Faculty of Engineering, Sestre Janjic Str. 6, 34000, Kragujevac, Serbia b University of Belgrade, Faculty of Mining and Geology, Djusina Str. 7, 11000, Beograd, Serbia a r t i c l ...
    ... desirable (normative scenarios e “How to achieve a desirable future?” or “How a solution to a particular problem might look?“). Backcasting is one of the approaches for creating the third group of scenarios. Backcasting could be defined as generating a desirable future and looking backwards from this ...
    ... biomass and a location of the plant for its valorisation enables the determination of optimal transport routes. All of the above data should be systematized into a database that is used as an input to a mathematical model. 2.3. Optimal quantity of biomass for using under current condition A certain amount ...

  • An Integrated Environment for Management and Exploitation of Linguistic Resources

    Ranka Stanković, Ivan Obradović (2009)

  • Terminological and lexical resources used to provide open multilingual educational resources

    Biljana Lazić, Danica Seničić, Aleksandra Tomašević, Bojan Zlatić (2016)
    Open educational resources (OER) within BAEKTEL (Blending Academic and Entrepreneurial Knowledge in Technology enhanced learning) network will be available in different languages, mostly in the languages of Western Balkans, Russian and English. University of Belgrade (UB) hosts a central repository based on: BAEKTEL Metadata Portal (BMP), terminological web application for management, browse and search of terminological resources, web services for linguistic support (query expansion, information retrieval, OER indexing, etc.), annotation of selected resources and OER repository on local edX ...
    otvoreni obrazovni resursi, leksički resursi, obrada prirodnih jezika, terminologija

  • Multiword Expressions between the Corpus and the Lexicon: Universality, Idiosyncrasy and the Lexicon-Corpus Interface

    Verginica Barbu Mititelu, Voula Giouli, Kilian Evang, Daniel Zeman, Petya Osenova, Carole Tiberius, Simon Krek, Stella Markantonatou, Ivelina Stoyanova, Ranka Stankovic, Christian Chiarcos (2024)
    Predstavljamo trenutne aktivnosti na definisanju interfejsa leksikona i korpusa koji će služiti kao referenca u prikazu polileksemskih jedinica - višečlanih izraza - (različitih tipova - imenskih, glagolskih, itd.) u specijalizovanim leksikonima i povezivanju ovih unosa sa njihovim pojavljivanjima u korpusima. Konačni cilj je korišćenje ovakvih resursa za automatsko identifikovanje višečlanih izraza u tekstu. Uključivanje nekoliko prirodnih jezika ima za cilj univerzalnost rešenja koje nije usredsređeno na određeni jezik, kao i prilagođavanje idiosinkrazijama. Raspravljaju se izazovi u leksikografskom opisu višerečnih ...
    multiword expression lexicon, corpus, proof-of-concept lexicon encoding

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... that employ the A dataset with 100 and 250 trees demonstrate this trend. The F1 score is a crucial evaluation metric for assessing the overall performance of a model and is on par with the AUC (Area Under the Receiver Operating Char- acteristic Curve) metric. It displays a categorization of ...
    ... it can be noted that there exists a disparity of approximately 2% in the AUC metric for the ophiolite class, with the RF_C_100 model exhibiting a slightly higher AUC value. The precision metric exhibits a significant contrast, with RF_C_100 demonstrating a 9% higher precision. In general, the ...
    ... models. A comparative analysis can be conducted between RF_C_100_5MI and KNN_C_5, both of which are con- sidered the top-performing models, with RF_C_100 serving as the reference model. A false positive (FP) map can be utilized to draw a comparison, wherein all instances that a particular ...

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... 2 | Gasanchors....a e eeaeaaaaaaeaeaeaeaa a aaeaeaaeeaeaeaeaaaktaktaet 22 3.3 - Sucker Rods ... eaaeeaeaeaeaaa a aaeaeaeaeeaeaeaeaaaktaktaet 24 3.4 | Tubing anchor........aaaaaaa a anaaanaaaaaeaa a aaa a aaaaaaaaaataatetet 26 4 SURFACE EQUIPMENT7........ a eeaaea a aaeaeae a aataeaataitekot 27 ...
    ... SUCKER ROD PUMPING SYSTEM.......a a anaeananaeee 32 5.1 · RodStar.a a eeaeaeaaaeaeaeaaaaaaaeaeaeaNeeaeeaeaeaaaataktae t 35 5.1.1. RodStar FeatureS.aaaaaaaaaaaaa a aeaan e ae a aaeaeaeaeaaaaaaeaeaittittkoi 36 5.2 | ProspeF..a a nanaaaraeaaeaaaaa a aaaaaaeaaaaaaa a aaaaaaeaaaaaaaNtatet 37 5.2.1 ...
    ... 1. Prosper Features al nanaaaaaaaaa a aaaaaaaaaaeaai ttt 38 6 COMPARATIVE ANALYSIS OF DIFFERENT SOFTWARE TOOL ... 39 6.1 „WellXX-1Iin RodStar....a e ee e aeaeaaeeaeeaeaaakaaktaet 40 6.2 WellXX-Iin Prosper......caaaaaaaa a anaraeaa a a aaaaaaaaaaaaea a aaataNtatet 44 63 _ WellXX-Iin QROD.... ...

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije