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290 items

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications

    Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалима

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • 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
    ... an algorithm that marks messages as spam if they contain one or more recognized phrases or patterns. 3. Testing and Refining - Finally, we would test our program and iterate through steps 1 and 2, refining the rules and algorithms until we achieve satisfactory results. 17 This approach can ...
    ... transform (CWT or DWT), the wavelet function, and the level of scale. This flexibility is an advantage of wavelet functions, but it is crucial to test different options to find the best choice.In this study, both continuous and discrete transforms were tested for various wavelet functions. Initially ...
    ... and then move on to more complex ones. Testing on a smaller dataset can facilitate rapid algorithm changes. It is 58 also important to first test algorithms without tuning, and then with hyperparameter tuning to determine if adjustments improve accuracy. After testing, algorithms with better ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • Метода променљивих околина за решавање проблема p-центра са поузданом мрежом

    Јована Рађеновић, Стефан Мишковић, Оливера Станчић (2023)
    У овом раду је разматран проблем p-центра са поузданом мрежом (енгл. Reliable p-center facility location problem - RpCFLP). Решавање проблема подразумева иницијално успостављање p ресурса и алокације корисника, као и накнадну реалокацију корисника у складу са новонасталим сценаријима који садрже информације о онеспособљеним ресурсима и осталим измењеним улазним подацима. За решавање посматраног проблема предложена је метахеуристика заснована на итеративној варијанти основне методе променљивих околина (енгл. Iterated basic variable neighborhood search - IBVNS). Резултати тестирања предложене метахеуристике указују на њену ...
    Проблем p-центра, Робусна оптимизација, Метода променљивих околина

  • 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
    ... remote control 4–9 grade 4. Application of Conceptual Model for the Selection of an Artificial Lift Method at the Test Well GL oil well in Salman oil field in Iran has been chosen as a test well. The Salman oil field data are given in Table 4. Selection of mentioned method was done using an optimization ...
    ... 2020, 13, x 10 of 15 4. Application of Conceptual Model for the Selection of an Artificial Lift Method at the Test Well GL oil well in Salman oil field in Iran has been chosen as a test well. The Salman oil field data are given in Table 4. Table 4. Salman oil field input data [12]. Parameters ...

  • 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
    ... units and main geological structures in compliance with the required standards. 1G-E-Connector utility eXows (eXtended OGC Web Services) isused to test the local web services, use metadata and register the services at the 1G-E Viewer, thus providing multilingualism and compliance with OneGeology Europe ...
    ... (2008-2010) was to make geological maps at a scale 1:1M from Europe discoverable and accessible, make them available under a common data license, and to test the guidelines for generating an interoperable environmental information infrastructure. А multilingual metainformation system gives access to information ...
    ... units and main geological structures in compliance with the required standards. 1G-E-Connector utility eXows (eXtended OGC Web Services) isused to test the local web services, use metadata and register the services at the 1G-E Viewer, thus providing multilingualism and compliance with OneGeology Europe ...

  • 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
    ... geological units below the surface. An added element of this study pertains to the utilization of legacy geological maps as the basis for ophiolite test data (Pendžerkovski et al. 1963; Rakikevik et al. 1965, 1969, 1973; Ivanovski and Rakicević 1970; Hristov et al. 1965, 1973; Karajovanovic and Hristov ...
    ... near value. The number of trees was incrementally increased from 50 to 250 with a step of 50 trees. Subsequently, all results were graphed on the test area and, alongside the eval- uation metrics, Wwere interpreted and discussed. The process of conducting ML classification on spatial data involves ...
    ... classification algorithm is a non-parametric algorithm (Ge et al. 2018) that finds the K closest objects in the train data from which it predicts the test data label (Steinbach and Tan 2009). The choice of the K parameter has a significant impact on the KNN classification (James et al. 2013), and ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion
    ... In a much smaller number of Fig. 7. Results obtained on the second set of test data (in%) cases (20%) the incorrect solution resulted from the system’s failure to cover a specific MWU structure. With the second set of test data (nouns collected from various sources) we proceeded as follows. First ...
    ... we have recognized in subsections IV-B and IV-C, the evaluation results were classified as follows: Fig. 6. Results obtained on the first set of test data (in%) a) If the system produced the correct lemma and assigned the correct inflectional class for a given MWU the overall solution was considered ...

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... landslide susceptibility model. Extraction of a particular land- slide conditioning parameter and repetition of the validation pro- cess is one approach to test model sensitivity (LEE & TALIB, 2005; GUZZETTI et al., 2006). Other approaches for testing the sensitivity of a particular landslide susceptibility ...
    ... proposed sensitivity coefficients is 2.125, whereas the minimum possible value of the WTLSR is 0.0525. Equations for calculation of the WTLSR used to test the TLSR models sensitivity are as follows: WLT-TLSR100 = LT-R*0.3 + SI-R*0.175 + AP-R*0.175 + EI-R*0.175 + LU-R*0.175 (2) WLT-TLSR500 = LT-R*0 ...
    ... lo g ia C ro a ti ca Geologia Croatica 72/190 Based on results presented in our research, it is obvious that there is also the possibility to test the sensitivity of landslide sus- ceptibility models in a simple, yet acceptable manner. The opti- mization of preliminary prepared models should always ...

  • Mikrobiološki diverzitet kiselog jezera Robule i uticaj jezerske vode na oksidaciju sulfidnih minerala

    Srđan B. Stanković (2016-09-11)
    Jezero Robule, formirano u podnožju rudničke raskrivke Oštreljski planir (Rudnik bakra Bor), je nastalo kao posledica rudarskih aktivnosti. Mikrobiološki diverzitet ekstremno kiselog jezera Robule ispitivan je primenom kako klasičnih mikrobioloških metoda (svetlosna mikroskopija i kultivacija na selektivnim podlogama) tako i primenom savremene metode molekularne biologije (analiza polimorfizama terminalnih restrikcionih fragmenata; T-RFLP). Takođe, ispitivan je i potencijal i efikasnost jezerske vode u biološkom luženju mineralnog koncentrata, kao i u bioluženju uzoraka stare flotacijske jalovine Rudnika bakra Bor.Na osnovu dobijenih rezultata ...
    jezero Robule, acidofilne bakterije, bioluženje, kisele rudničke vode, flotacijska jalovina
    ... koncentracije Fe(II) i Fe(III) u laboratoriji Univerziteta u Bangoru primenjen je ferozinski test, dok su u laboratoriji IMGGI primenjeni fenantrolinski i tiocijanatni test. 3.3.1 FEROZINSKI TEST Ferozinski test (Lovely and Philips, 1987) se koristi za određivanje koncentracije Fe(II) u uzorku. Da ...
    ... klasifikovane na osnovu serije biohemijskih testova. Pomoću ovih testova određivan je procenat fenotipske sličnosti među ispitivanim sojevima. Sojevi su svrstavani u istu vrstu ako je procenat sličnosti bio veći od 80 %. Međutim, čak i 100-200 biohemijskih testova pokriva samo 5-20 % ukupnog genetičkog ...
    ... ........................................52 3.3.1 Ferozinski test ............................................................................................................................. 52 3.3.2 Fenantrolinski i tiocijanatni test ............................................................. ...

  • Using Lexical Resources for Irony and Sarcasm Classification

    Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković (2017)
    The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...
    ... what if there was no evidence, he is guilty’, where un- derlined words belong to BCMS as well (not necessarily with the same meaning). In the example Testovi za AM, A1 I A2 kategoriju su vrhunska stvar koja može da ti se desi u životu, ‘Tests for AM, A1 and A2 category are the best thing that can happen ...
    ... Thus, annotators put each tweet into classes (BCMS, not_BCMS, ironic, non_ironic). Inter-annotator agreement was assessed using the Kripendorff α- test (Kalpha).7 Research by [17] about values of the Kalpha coeffi- cient showed that agreements whose values are α ≥ 0.667 can be considered reliable, and ...
    ... to sarcastic and non-sarcastic tweets was performed by the same linguistic experts and inter- annotator agreement, assessed using the Kripendorff α-test, achieved α = 0.86; we used, for further processing, those tweets which have been assessed by both annotators as either sarcastic or non-sarcastic; ...

  • Using English Baits to Catch Serbian Multi-Word Terminology

    Cvetana Krstev, Branislava Šandrih, Ranka Stanković (2018)
    In this paper we present the first results in bilingual terminology extraction. The hypothesis of our approach is that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source language, a terminology extractor for a target language, and a ...
    aligned texts, word alignment, terminology extraction, electronic dictionaries, morphological inflection
    ... T (term.extract), where (S(term.list) ∼ S(align.chunk)) ∧ (T (term.extract) ∼ T (align.chunk)) ∧ (S(align.chunk) ↔ T (align.chunk)). In order to test our approach and determine a threshold we have used the existing bi-lingual terminology resource in order to establish: • How many aligned chunks after ...
    ... in evaluations of translation quality. First we splitted corpus of aligned sentences into three disjoint parts: training (80%), development (10%) and test set (10%). BLEU score (Papineni et al., 2002) was obtained for the three different 3-gram language models. First model was trained only on the training ...
    ... trained on the training set extended with the bilingual list containing the general lexica list and the parallel list from SWN and PWN. BLEU score for the test set increased to 24.93. Third model was extended with the list of inflected forms as in the real experiment setting and BLEU score increased to 26.21 ...

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... could now be studied from a new perspective, using instruments carried into orbit by satellites. This has resulted in an increased ability to test and prove hypotheses, and also 12 Meteorite created new ways of studying the interactions of terrestrial cycles and systems on a truly global ...

  • Концепт расположивости при дефинисању ефикасног одржавања помоћне механизације на површинским коповима

    Radiša D. Đurić (2016-05-30)
    Оцена расположивости представља основну компоненту уинжењерском управљању опремом. Расположивост је свеобухватни концепткоји представља меру употребног квалитета техничких система, који садржичитаву серију парцијалних индикатора који се односе на време у раду ивреме у отказу система као и на његову функционалну погодност. Овадисертација даје структурну анализу парцијалних индикатора као и развојмодела њихове синтезе на ниво расположивости. Поменути подаци имајухибридни карактер (измерени и експертски добијени) и њихова интеграцијаи синтеза је остварена коришћењем фази пропозиције и фази закључивања.Овакав приступ омогућава оцену техничког система ...
    управљање опремом, инжењерство одржавања,расположивост, фази закључивање, прикупљање података, булдозер
    ... ln(𝜂) ⇒ 𝜂 = e−(𝑏𝑎) Колмогоров-Смирнов тест (K–С тест) је најчешћи метод за тестирање хипотезе успостављених закона дистрибуције. К-С тест је коришћен да дефинише да ли подаци о квару/застоју долазе из популације са одређеном расподелом. К-С тест врши поређење функције расподеле и теоријске функције ...
    ... јављају код најмањих релативних учесталости. Да би се у оцени ових одступања добила одређена сигурност, користе се тзв. статистички тестови, међу којима се највише користи тест Колмогоров- ПОЧЕТАК Полазни подаци ti i = 1,2, ... n Израчунавање t, σ, t50 t ≈ σ иλ(t) ≈ const t ≈ t50 Израчунавање λ(t) ...
    ... подручја, то не значи да је овако претпостављена расподела тачна, већ само да може бити задовољавајућа. Ово је обележје и свих других статистичких тестова, али се тест Колмогоров-Смирнова наводи као најприкладнији за употребу. Слика 2.16. Папир вероватноће за Вејбулову расподелу Докторска дисертација ...

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... Vol. 18, No. 6, 551-561, 1980, http://dx.doi.org/10.1111/j.1745-6584.1980.tb03649.x 25. Thierrin, J., Davis G. B., and Baber C., A Ground-water Tracer Test with Deuterated Compounds for Monitoring in situ Biodegresation and Retardation of Aromatic Hydrocarbons, Ground Water, Vol. 33, No. 3, 469-475 ...
    ... finer than it or using another words, 10%, 50% and 60% of the sample by weight is smaller than diameter d10, d50 and d60). According to pumping test data, the transmissibility coefficient in the extended area of Kikinda, depending on the locality in question, is in the range of (2.5-10) × 10-2 ...

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... goodness-of-fit of a model is evaluated in terms of the discrepancy coefficient 𝐶 = 𝜒 /𝑁, where 𝜒 is the value of the test statistic from the Pearson 𝜒 goodness-of-fit test and 𝑁 is the sample size. As a rule of thumb, the fit is considered satisfactory if 𝐶 < 0.02 (Mačutek & Wimmer, 2013) ...

  • Increasing the Local Road Network Resilience from Natural Hazards in Municipalities in Serbia

    Biljana Abolmasov, Miloš Marjanović, Ranka Stanković, Uroš Đurić, Nikola Vulović (2024)
    lokalni putevi, prirodni hazardi, otpornost na klimatske promene, MaPLoRds