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179 items

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... hyperparameter tuning: 49 -Grid Search: This method involves testing all possible combinations of hyperparameter values that you have predefined. This can be very time-consuming, as the algorithm must try every combination to find the best one. -Random Search: This method randomly selects a few ...
    ... accuracy and effectiveness. 3.Hyperparameter Tuning: Optimize model performance through hyperparameter tuning. Techniques such as Grid Search or Random Search can be used to improve accuracy. 4. Integration with Existing Systems: Develop an interface for integrating models with existing monitoring ...

  • Developing Students’ Mining and Geology Vocabulary Through Flashcards and L1 in the CLIL Classroom

    Lidija Beko, Ivan Obradović, Ranka Stanković (2015)
    ... in the blended learning approach through an export of its subsets to the Moodle e-learning environment. (Stanković et al 2012, e-Learning). In search of acceptable flashcard system, we have opted for in-house development in order to incorporate all of the platforms used at the Faculty, such as ...

  • Formative evaluation of e-learning projects with the logical framework approach

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... Metadata Portal (BMP), where metadata, providing all important information on the network resources will be stored, thus enabling their centralized search and browse. The initial network consists of six nodes located at different Western Balkans (WB) universities participating in this project, with ...

  • Увођење доменских и семантичких маркера за област рударства у српске електронске речнике

    Иван Обрадовић, Александра Томашевић, Ранка Станковић, Биљана Лазић (2017)
    ... and proposesanexpansion of the set of the semarkers for the field of mining. A brief description of the developed corpus of texts from the field of mining is also given, for the search of which the proposed markers are extremely important. ...

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... lo... x &8H8aQ © © sum hk MOOm- R PiALEK Bookmaris) x energy-related PM emissions. In all cases, natural gas results in much lower emissions, as Search Savact Page El~ Bh there is an imperative — for safety reasons and to avoid corrosion to the pipeline transport ¥ ffl Energy and Air Pollution: system ...

  • Нове технологије за оживљавање старих текстова

    Цветана Крстев, Ранка Станковић, Бранислава Шандрих Тодоровић, Милица Иконић Нешић (2023)
    удаљено читање, књижевни корпус, обрада српског језика, анотација врстом речи, лематизација, именовани ентитети

  • SrpELTeC: A Serbian Literary Corpus for Distant Reading

    Ranka Stanković, Cvetana Krstev, Duško Vitas (2024)
    U članku je predstavljen SrpELTeC, korpus razvijen u okviru akcije COST Distant Reading for European Literary History (CA16204). Svi romani u SrpELTeC-u su odabrani, pripremljeni i obeleženi korišćenjem zajedničkih principa uspostavljenih za sve jezičke zbirke u Evropskoj zbirci književnog teksta (ELTeC). Navedeni su izazovi i rešenja u pripremi SrpELTeC od nule. Svi romani su ručno kodirani u TEI sa bogatim metapodacima i strukturnim napomenama. Automatska anotacija je uključivala POS-označavanje, lematizaciju i imenovane entitete, oslanjajući se na resurse za obradu ...
    digital humanities, Serbian literature, text corpora, distant reading , linked data, named entity recognition, text analytics

  • A Tel Platform Blending Academic And Entrepreneurial Knowledge

    Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović (2013)
    ... terms with more than 3000 dictionary entries in Serbian and their English equivalents, developed within the GeolISS project and available for search on the web (http://geoliss.mprrpp.gov.rs/term/). Another example is RudOnto, a complex terminological resource also developed at the University ...

  • A Multilingual Evaluation Dataset for Monolingual Word Sense Alignment

    Sina Ahmadi, John P McCrae, Sanni Nimb, Fahad Khan, Monica Monachini, Bolette S Pedersen, Thierry Declerck, Tanja Wissik, Andrea Bellandi, Irene Pisani, [...] Ranka Stanković and others (2020)
    Aligning senses across resources and languages is a challenging task with beneficial applications in the field of natural language processing and electronic lexicography. In this paper, we describe our efforts in manually aligning monolingual dictionaries. The alignment is carried out at sense-level for various resources in 15 languages. Moreover, senses are annotated with possible semantic relationships such as broadness, narrowness, relatedness, and equivalence. In comparison to previous datasets for this task, this dataset covers a wide range of languages ...
    lexical semantic resources, sense alignment, lexicography, language resource
    ... (Dictionary of Contemporary Dutch, ANW)7. The Dutch lemmas 4https://bg.wiktionary.org 5https://ordnet.dk/ods_en 6http://gtb.ivdnt.org/search 7http://anw.ivdnt.org/search 3235 exact The sense are the same, for example the definitions are simply paraphrases broader The sense in the first dictionary ...
    ... (LTC 2011), pages 126–130. Henrich, V., Hinrichs, E. W., and Suttner, K. (2012). Auto- matically linking GermaNet to Wikipedia for harvesting corpus examples for Germanet senses. JLCL, 27(1):1– 19. Henrich, V., Hinrichs, E., and Barkey, R. (2014). Align- ing word senses in GermaNet and the DWDS ...

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... of users, a client-server application was developed enabling web access to this resource at http://rudonto.rgf.bg.ac.rs (Figure 1). The user can search RudOnto using keywords or browse through available concepts either in Serbian or English using a tree-like structure [9]. 13th ISCSM 2016 BELGRADE ...

  • Insights into dike nucleation and eruption dynamics from high-resolution seismic imaging of magmatic system at the East Pacific Rise

    Milena Marjanović, Suzanne M. Carbotte, Alexandre Stopin, Satish C. Singh, René-Édouard Plessix, Miloš Marjanović, Mladen R. Nedimović, Juan Pablo Canales, Hélène D. Carton, John C. Mutter, Javier Escartín (2023)
    Multidisciplinary

  • 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
    ... e method (Optimal pumping Energies 2020, 13, 1758; doi:10.3390/en13071758 www.mdpi.com/journal/energies Energies 2020, 13, 1758 2 of 15 unit search—OPUS, Sistema Experto de Levantamiento Artificial—SEDLA). Decision-making methods, such as the decision tree and the most recent multi-criteria analysis ...
    ... advantages and disadvantages were defined in one place [6]. In 1988, E.P. Valentin and F.C. Hoffmann developed a smart integrated Optimal pumping unit search system (OPUS) for the selection of artificial lift methods. OPUS has the ability to control the technical and financial aspects of the selection of ...

  • Srbija u OneGeology Europe

    Danka Blagojević, Ranka Stanković, Petar Stejić, Velizar Nikolić (2014)
    Геолошки завод Србије као носилац Пројекта ОneGeologyEurope заједно са Рударско геолошким факултетом и Министарством за природне ресурсе, рударство и просторно планирање су се укључили у међународни Пројекат OneGeology Europe у мају 2013. године у већ поодмаклој фази израде Пројекта. До краја 2013. године испунили су завршене активности које треба да доведу до пуноправног укључења у Пројекат чиме је Република Србија нашла своје место на Геолошкој карти Европе 1:1М. Геолошка карта Србије 1:1М представља компилациону односно поједностављену верзију ОГК 1:500 ...
    OneGeologyEurope, метаподаци, хармонизација података, вишејезични мета-информациони систем
    ... geological maps within 1G-E. Schematic harmonization ensures that all data sets have a coherent data structure, to enable web services to read and search the data in the right way. Syntax and data language, as well as systems for data management were implemented in accordance with the OpenGIS (OGS) ...
    ... geological maps within 1G-E. Schematic harmonization ensures that all data sets have a coherent data structure, to enable web services to read and search the data in the right way. Syntax and data language, as well as systems for data management were implemented in accordance with the OpenGIS (OGS) standards ...

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... GUI. The package General Interface with its GridViewPros and BiblRgf libraries contains a template of the classes used for different types of data search, domain control, selection of domain elements, and implementation of hierarchical data structures in the form of trees. The business logic of the ...

  • The Dictionary of the Serbian Academy: from the Text to the Lexical Database

    Ranka Stanković, Rada Stijović, Duško Vitas, Cvetana Krstev, Olga Sabo (2018)
    In this paper we discuss the project of digitization of the Dictionary of the Serbo-Croatian Standard and Vernacular Language. Scanning and character recognition were a particular challenge, since various non-standard character set encoding was used in the course of the almost 60-year long production of the dictionary. The first aim of the project was to formalize the micro-structure of the dictionary articles in order to parse the digitized text of and transform it into structured data stored in relational lexical database. This approach ...
    computer lexicography, lexical database, language resources, dictionary, Serbian language
    ... will be able to search through its lexical database. It is also envisaged for the basic data will be open to the general public. References Ahačič, K., Ledinek, N., & Perdih, A. (2015). Fran: The Next Generation Slovenian Dictionary Portal. In Natural Language Processing, Corpus Linguistics, Le ...
    ... le contain information about prove- nance and use. The class References contains metadata about the bibliographic information from the dictionary corpus. The set of markers is partially aligned with the TEI elements (and attributes) and LexInfo in order to relate the lexical data to other resources ...

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri
    ... the equations: Ωc = [∑R,M,S j]c / 3 (3) All of these outcomes are treated with the max-min composition, as follows: - For each outcome search for the MINimum value of μR,M,S in vector Ac (2). The minimum that corresponds to the o-th combination is calculated following the equations: MINo ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • Prognoza operativne efikasnosti aktivnog podzemnog rudnika zasnovana na teoriji sivih sistema

    Svetlana M. Štrbac-Savić (2016-06-10)
    Efikasnost predstavlja preduslov za opstanak svake rudarske kompanije, posebno u uslovima izuzetno konkurentnog trţišnog okruţenja kao što je to rudarska industrija. Efikasnost oznaĉava sposobnost kompanije da ispuni svoje kratkoroĉne ili dugoroĉne ciljeve. Operativna efikasnost se definiše kao odnos izmeĊu ulaznih parametara potrebnih za odvijanje proizvodnje i pokazatelja dobijenih proizvodnjom. U kontekstu rudarskog poslovanja, operativna efikasnost se odnosi na vreme potrebno da se mineralno dobro transformiše u novĉana sredstva. Visoka operativna efikasnost se postiţe kada se ostvari prava kombinacija karakteristika ...
    podzemni rudnik, operativna efikasnost, prognoza, teorija sivih sistema, stohastiĉke diferencijalne jednaĉine, simulacija
    ... Hefte 27 no. 4, pp. 315–326, 1986. http://www.ams.org/mathscinet/search/authors.html?authorName=Eichenauer%2C%20Jurgen http://www.ams.org/mathscinet/search/authors.html?authorName=Eichenauer%2C%20Jurgen http://www.ams.org/mathscinet/search/authors.html?authorName=Lehn%2C%20Jurgen 85 [GENTRY84] ...
    ... celobrojna vrednost Xk moţe se transformisati na interval [0,1) na sledeći naĉin: U(k)=   kX U k m  (3.51) http://www.ams.org/mathscinet/search/authors.html?authorName=Eichenauer%2C%20Jurgen 50 Postupak dobijanja sluĉajne veliĉine iz njene funkcije raspodele ili funkcije gustine v ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)