Претрага
704 items
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Concept od predictive hydrodynamic calculations: An overview of the case studies from Serbia
Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Vesna Ristić Vakanjac, Marina Čokorilo Ilić (2019)groundwater management, hydrodynamic model, multiple-criteria decision making, open cast mine, groundwater source.0Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Vesna Ristić Vakanjac, Marina Čokorilo Ilić. "Concept od predictive hydrodynamic calculations: An overview of the case studies from Serbia" in National Conference with international participation “Geosciences 2019”, Bulgaria, 2019, Sofia : Bulgarian Geological Society (2019)
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Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika
Saša M. Jovanović (2016-05-16)Investiciono okruženje skopčano sa rudarskom industrijom je veoma svojstveno kada seuporedi sa okruženjima koje susrećemo u tipičnim proizvodnim industrijama. Neke odkarakterisitka rudarstva, koje su često naznačene kao jedinstvene su: visok intenzitetinvesticija, dugi predproizvodni periodi, visok rizik i neobnovljivost resursa.Investiranje u sistem otvaranja rudnika predstavlja dobar primer ireverzibilneinvesticije. Takva investicija zahteva pažljivu analizu, jer nakon njene realizacije ona sene može nadoknaditi bez značajnog gubitka vrednosti. Očigledno je da izbor sistemaotvaranja podzemnog rudnika pripada strateškom planiranju...... determinističkim modelima. U ovakvim uslovima, matematičko modeliranje sistema zasniva se na proširivanju determinističkog modela uvođenjem slučajnosti. Ove slučajnosti se opisuju terminima verovatnoće i krajnji ishod je stohastički model sistema. Uopšteni oblik stohastičkog modela predstavljen je ...
... 03:57:19 Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika;Fuzzy stochastic model of underground development system selection. Saša M. Jovanović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Fuzzy stohastički model izbora sistema otvaranja ...
... uvođenje što realističnijih pretpostavki u razvoju fuzzy stohastičkog modela za izbor optimalnog sistema otvaranja podzemnog rudnika, (3) postavljanje dinamičkog optimizacionog modela i (4) provera valjanosti postavljenog modela u rešavanju praktičnih problema. 3 1.3 Polazne postavke ...Saša M. Jovanović. "Fuzzy stohastički model izbora sistema otvaranja podzemnog rudnika" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-05-16)
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The Dictionary of the Serbian Academy: from the Text to the Lexical Database
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 ...... published. For the de- velopment of the lexical database model for the DSA, a similar approach was used as in Stanković et al. (2018) for the Serbian morphological electronic dictionary. The main class, in the core of this dic- tionary model, is LexicalEntry, representing a headword of the dictionary ...
... as outlined in Stijović and Stanković (2017). Figure 4: Database model with mapped dictionary article segments. For languages with complex morphology, such as Serbian, information about inflection is very im- portant. In our model we used the class Forms to store the information related to the inflected ...
... ontologies (TEI, LMF, Ontolex, LexInfo). A lexical database mod- el was designed in compliance with these structured forms, following mostly the lemon model. Mapping of the lexical entry markers to LexInfo and TEI enabled export of the lexical data to the mentioned formats. A software solution for the ...Ranka Stanković, Rada Stijović, Duško Vitas, Cvetana Krstev, Olga Sabo. "The Dictionary of the Serbian Academy: from the Text to the Lexical Database" in Proceedings of the XVIII EURALEX International Congress: Lexicography in Global Contexts, Ljubljana : Ljubljana University Press, Faculty of Arts (2018)
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Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeBranislav Petrović, Veljko Marinović, Zoran Stevanović. "Characterization of the eastern Suva Planina Mt. karst aquifer (SE Serbia) by time series analysis and stochastic modelling" in Environmental Earth Sciences, Springer Science and Business Media LLC (2023). https://doi.org/10.1007/s12665-023-10911-5
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Numerical simulation of the Late Jurassic closure of the Vardar Tethys
... utilizes marker in cellapproach with finite difference discretization of equations on a staggered grid [Gerya et al., 2000;Gerya&Yuen, 2003]. The 2D model consists of two continental plates separated by two oceanic slabs connected at amid-oceanic ridge. Intraoceanic subduction is initiated along the ridge ...
... ridge by assigning a weak zonebeneath the ridge. Time-dependent boundary conditions for velocity are imposed on thesimulation in order to model a transient spreading period. The change of sign in plate velocities isfound to be useful for both obtaining obduction / ophiolite emplacement [Duretz et al. ...
... two convergent phases separated bya single divergent phase where spreading regime is dominant. Effect of duration and magnitude ofthe second phase on model evolution is also explored. Our so far obtained simulations were able to reproduce the westward obduction and certainextension processes along the active ...Nikola Stanković, Vesna Cvetkov, Vladica Cvetković. "Numerical simulation of the Late Jurassic closure of the Vardar Tethys" in EGU General Assembly 2021, Copernicus GmbH (2021). https://doi.org/10.5194/egusphere-egu21-9893
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2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys
... utilizes marker in cellapproach with finite difference discretization of equations on a staggered grid [Gerya et al., 2000;Gerya&Yuen, 2003]. The 2D model consists of two continental plates separated by two oceanic slabs connected at amid-oceanic ridge. Intraoceanic subduction is initiated along the ridge ...
... ridge by assigning a weak zonebeneath the ridge. Time-dependent boundary conditions for velocity are imposed on thesimulation in order to model a transient spreading period. The change of sign in plate velocities isfound to be useful for both obtaining obduction / ophiolite emplacement [Duretz et al. ...
... two convergent phases separated bya single divergent phase where spreading regime is dominant. Effect of duration and magnitude ofthe second phase on model evolution is also explored. Our so far obtained simulations were able to reproduce the westward obduction and certainextension processes along the active ...Nikola Stanković, Vesna Cvetkov, Vladica Cvetković. "2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys" in EGU General Assembly 2020, Copernicus GmbH (2020). https://doi.org/10.5194/egusphere-egu2020-5919
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Geotehnička istraživanja terena za potrebe izgradnje mosta preko Aleksandrovačkog potoka na autoputu E-80, deonica Niš-Merošina
Danijela Sušić (2023)Geotehnička istraživanja terena, odnosno određene lokacije, izvode se za potrebe projektovanja, odnosno definisanja uslova izgradnje objekata. Njihova osnovna namjena jeste upoznavanje i prikupljanje informacija o sastavu i svojstvima geološke sredine koje bi mogle da nam omoguće planiranje, projektovanje, izgradnju, kao i racionalno korišćenje samog objekta. U ovom radu, detaljno je prikazan način svih izvršenih istraživanja, za potrebe izgradnje mosta na osnovu kojih je urađen grafički dio, proračun nosivosti plitko fundiranog mosta i proračun analize slijeganja terena. Za proračun dozvoljenog opterećenja ...geotehnička istraživanja, terenska istraživanja, laboratorijska ispitivanja, geotehnički model terena, plitki temeljiDanijela Sušić. Geotehnička istraživanja terena za potrebe izgradnje mosta preko Aleksandrovačkog potoka na autoputu E-80, deonica Niš-Merošina, 2023
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Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation
kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje... and Scientific Colourmaps (Crameri 2018). The analogue model experiment has been conducted in the framework of the PhD project of Nemanja Krstekanić. R E F E R E N C E S Adam, J., Klinkmüller, M., Schreurs, G. & Wieneke, B., 2013. Quantitative 3D strain analysis in analogue experiments simulating tectonic ...
... have designed a model setup such that different regions of the model experience a wide range of different types of deformation: strike-slip faults (simple shear), normal faulting (extension) and thrust faulting (shortening). In the later stages of the model evolution, a part of the model undergoes a clockwise ...
... Diff. Stress (Pa) 0 2 1 C om pression S trik e -s lip N V 30° 4.5° clockwise rotation Figure 11. Model set-up: (a) Initial model set-up. All numbers are in centimeters. (b) Model configuration at the end of the experiment. Moving plate kinematics include the first step of 4 cm of translation ...Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer. "Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation" in Geophysical Journal International, Oxford University Press (OUP) (2021). https://doi.org/10.1093/gji/ggab120
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Production information system of the Pljevlja coal mine
Božo Kolonja, Ranka Stanković, Filip Vuković . "Production information system of the Pljevlja coal mine" in Mine Planning and Equipment Selection 2000, Routledge (2018). https://doi.org/10.1201/9780203747124-154
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Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian
The training of new tagger models for Serbian is primarily motivated by the enhancement of the existing tagset with the grammatical category of a gender. The harmonization of resources that were manually annotated within different projects over a long period of time was an important task, enabled by the development of tools that support partial automation. The supporting tools take into account different taggers and tagsets. This paper focuses on TreeTagger and spaCy taggers, and the annotation schema alignment ...... (DNNs) (Huang et al., 2015; Choi, 2016; Akbik et al., 2018). The first operational tagger and lemmatization model for Serbian were produced as a parameter file (TT11) for the TreeTagger model (Schmid, 1999) after a thorough anal- ysis of the state-of-the-art solutions (Popović, 2010), and subsequently ...
... two taggers trained on the largest train- ing set (SR-{100}). We used it to train the following tag- gers: 1) SerSpaCy, a spaCy model, and 2) TT19, a Tree- Tagger model. We used T11 as the baseline for evaluation, since it was already tested and evaluated as part of a pre- vious research (Popović ...
... final schema in Subsection 3.2. The main fea- tures of the tools used for tagging are described in Subsec- tion 3.3. Evaluation results of spaCy model are compared with the results obtained by the TreeTagger trained on the same dataset, as well as with a previous version of TreeTag- ger for Serbian ...Ranka Stanković, Branislava Šandrih, Cvetana Krstev, Miloš Utvić, Mihailo Škorić. "Machine Learning and Deep Neural Network-Based Lemmatization and Morphosyntactic Tagging for Serbian" in Proceedings of the 12th Language Resources and Evaluation Conference, May Year: 2020, Marseille, France, European Language Resources Association (2020)
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Strain partitioning along a curved strike-slip fault system during indentation: inferences from analogue modelling
Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović. "Strain partitioning along a curved strike-slip fault system during indentation: inferences from analogue modelling" in GeoMod 2021, Doorn, the Netherlands, 19.-23.9.2021., Utrecht University (2021)
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Optimizacija parametara reza rotornog bagera pri otkopavanju materijala sa povećanom čvrstoćom
Saša D. Bošković (2016-09-09)Otkopavanje materijala rotornim bagerom je veoma sloţen fiziĉko-mehaniĉki proces. Pokazatelji efektivnosti tog procesa zavise od velikog broja raznovrsnih ĉinilaca od kojih se posebno mogu istaći: fiziĉko-mehaniĉke karakteristike materijala koji se otkopava, reţim rada bagera i izbor tehnoloških parametara bloka, odreska i reza, geometrije vedrica i zuba itd. Poseban problem se javlja kod otkopavanja materijala povećane ĉvrstoće, što je ĉest sluĉaj na našim površinskim kopovima. Dimenzionisanje specifiĉne sile kopanja bagera prema manjim masama izuzetno ĉvrstog materijala je neracionalno i rešenje ...rotorni bager, parametri reza, otpor na kopanje, dinamika bagera, kapacitet, optimizacija, specifična potrošnja energije... .. 117 Slika 5.8. Model strele rotora ............................................................................. 124 Slika 5.9. Model rotora ....................................................................................... 125 Slika 5.10. Raĉunski modeli strele rotora ......... ...
... nauĉni doprinos kroz definisanje metodologije, izradu simulacionog modela rada rotornog bagera, izradu modela radnog organa rotornog bagera (strele i rotora) metodom konaĉnih elemenata i terenska merenja koja će verifikovati model rada bagera i dinamiĉko ponašanje pri otkopavanju materijala sa povećanom ...
... bagera; 8 - Definisanje metodologije kroz izradu simulacionog modela rada rotornog bagera, izradu modela radnog elementa rotornog bagera (strele i rotora) metodom konaĉnih elemenata i terenska merenja koja će verifikovati model rada bagera i dinamiĉko ponašanje pri otkopavanju materijala sa ...Saša D. Bošković. "Optimizacija parametara reza rotornog bagera pri otkopavanju materijala sa povećanom čvrstoćom" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-09)
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The impact of limestone fragmentation on raw mix production in cement industry
Raw mix design is one of crucial point in production of clinker. Cement industry use limestone, marl, clay in particular percent to provide the best quality in production of clinker. The quality of the material must be in line with the quality targets. Fragmentation is important element, because affect preblending design, economic norm from blasting to crusher. Blasting is an operation which affects all subsequent operations and costs. The Kuz-Ram model is possibly the most widely used approach to ...Nikola Đokić, Lazar Kričak, Stefan Milanović, Marinko Pavlović, Stefan Krstić. "The impact of limestone fragmentation on raw mix production in cement industry" in Proceedings / XIV International Mineral Processing and Recycling Conference, IMPRC; May 12-14, 2021, Belgrade : University of Belgrade, Technical Faculty in Bor (2021)
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An oilfield in Libya: A new model to enhance waste water disposal
Dušan Danilović, Vesna Karović Maričić, Nori Elhaddad, Branko Leković. "An oilfield in Libya: A new model to enhance waste water disposal" in Energy & Environment (2016)
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Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке
... ranijih arheoloških rekognosciranja. U tu svrhu korišćena je Ojlerova 3D dekonvolucija (O3DD) na magnetomet‐ rijskim podacima. Da bi se dobili što bolji ulazni parametri prvo je izvršeno testiranje O3DD na sinteti‐ čkim modelima. METODE Magnetometrija se zasniva na merenju magnetnog polja Zemlje ...
... Ојлерове 3Д деконволуције на магнетометријске податке Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције ...
... USING EULER 3D DECONVOLUTION ON MAGNETIC DATA Vesna Cvetkov1, Ilija Vasiljević2, Branislav Sretenović1 , Vesna Damnjanović1 1) University of Beograde, Faculty of Mining and Geology, e‐mail: vesna.cvetkov@rgf.bg.ac.rs 2) NAFTAGAS‐Oilfield services d.o.o. Novi Sad Key words: Euler 3D deconvolution ...Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић. "Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке" in Књига апстраката 17. Конгрес геолога Србије, Врњачка Бања 17-20. мај, Српско геолошко друштво (2018)
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Towards translation of educational resources using GIZA++
... dX.clean 1 80 Language Model Training A language model (LM) is used to ensure fluent output, built with the target language, in our case English. Following script creates lm folder, positions in it and finally execute command that will build an 3-gram language model. mkdir ~/lm cd ~/lm ...
... about the text: ~/mosesdecoder/scripts/recaser/train-truecaser.perl \ --model ~/corpus/truecase-model.en --corpus \ ~/corpus/edX.tok.en ~/mosesdecoder/scripts/recaser/train-truecaser.perl \ --model ~/corpus/truecase-model.sr --corpus \ ~/corpus/edX.tok.sr Finally ...
... perl \ --model ~/corpus/truecase-model.en \ < ~/corpus/edX.tok.en \ > ~/corpus/edX.true.en 1 http://www.statmt.org/moses/glossary/SMT_glossary.html ~/mosesdecoder/scripts/recaser/truecase.perl \ --model ~/corpus/t ...Ivan Obradović, Dalibor Vorkapić, Ranka Stanković, Nikola Vulović, Miladin Kotorčević. "Towards translation of educational resources using GIZA++" in The Seventh International Conference on e-Learning (eLearning-2016), September 2016, Belgrade : Metropolitan Univesity (2016)
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Part of Speech Tagging for Serbian language using Natural Language Toolkit
Ranka Stanković, Boro Milovanović (2020)Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...... will be used for comparing different taggers. The simplest model in NLTK is Default tagger which tags every token with one selected PoS category [17]. Because the noun is by far the most represented PoS tag, the accuracy for this model on all tokens will be exactly 21,51%. This is the baseline tagger ...
... reasoning. NLTK API makes it possible to create multiple standalone tagger models as well as to combine them. We are going to try and test every model available in the version 3.5 released in March 2020. Having a plethora of different algorithms makes this library a good choice for a research. ...
... is picked. At the end of the chain, there is a rule which states that the word is of Noun category – same as for Default tagger. Obviously, this model AII 1.1.2 will perform better than the baseline tagger, but making the right rules demands significant effort. We did not invest much time in ...Ranka Stanković, Boro Milovanović. "Part of Speech Tagging for Serbian language using Natural Language Toolkit" in 7th International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2020, Academic Mind, Belgrade (2020)
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Towards a Mining Equipment Ontology
... equipment. The structure of RudOnto can be described by an UML (Unified Modeling Language) model, as depicted in Figure 2. A brief description of this model follows. The lexicographic superclass within the model is the class Rečnik, implemented as an abstract class. Concepts, which can be either general ...
... domain. At the same time an ontology is a data model of the domain and it can be used for drawing inferences on the basis of the information stored in the objects within that domain and the interconnections existing between them. 3 2.2. Model of the RudOnto terminological resource RudOnto ...
... relation in the model is implemented by involution, which means that a hyponym can appear only once in the resource hierarchy, with only one hypernym above it. Other semantic relations between concepts are enabled by the RelacijeTermina class, whereas the MultijezičkiLeks class in the UML model is used for ...Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja. "Towards a Mining Equipment Ontology" in Proceedings of the 12th International Conference Research and Development in Mechanical Industry, RaDMI 2012, September 2012, Vrnjačka Banja, Serbia no. 1, Vrnjačka Banja, Serbia : SaTCIP (Scientific and Technical Center for Intellectual Property) Ltd. (2012)
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Uticaj geološke neizvesnosti u razvoju rudarskih projekata
Rudarstvo je industrija koja se nosi sa različitim vrstama neizvesnosti i rizika zbog svoje prirode i specifičnosti. Neizvesnost u rudarstvu može poticati iz različitih izvora i uticati na različite aspekte rudarskih projekata. Kao jedan od dominantnih faktora, ističe se geološka neizvesnost. Geološka neizvesnost igra ključnu ulogu u rudarstvu i može značajno uticati na procenu resursa i rezervi, planiranje eksploatacije, ekonomsku isplativost i upravljanje rizicima. Ova neizvesnost se ne može eliminisati, ali se uz primenu adekvatnih standarda i zakona može ...... projekta, pod pretpostavkom da je geološka interperetacija ležišta adekvatna i da je zapreminska masa u blok modelu utvrđena sa velikom tačnošću. Raspoloživost višestrukih jednako verovatnih modela ležišta, omogućuje rudarskim inženjerima (projektantima) da povežu osetljivost granica kopa i dugoročnog ...
... modeliranje, • Analizaiprocena sadržaja,i • Procenai kontrola rizika. Procena resursa treba da bude kompletirana sa procenom rizika. Svi numerički modeli imaju višestruke značajne izvore rizika, vezane za podatke, geološku interpretaciju i modeliranje (procenu) sadržaja. Ocena rizika, vezana za promenljive ...
... između istražnih bušotina ı drugih istražnih radova, geološki kontinuitet ležišta, kontinuitet sadržaja, metodu procene i veličinu blokova u blok modelu, mogući način eksploatacije i period eksploatacije (Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (The ...Petar Marković, Dejan Stevanović, Mirjana Banković. "Uticaj geološke neizvesnosti u razvoju rudarskih projekata" in XI Međunarodna konferencija "Ugalj i kritični minerali 2023", CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)
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High-resolution sequence stratigraphy of carbonates - theory and examples
Jelena Stefanović, Dejan Radivojević (2020)Циљ рада је да кроз теоријски аспект и примере примене представи секвенциону стратиграфију високе резолуције карбонатних седимената. У том смислу први део се односи на појам и значење високе резолуције у секвенционој стратиграфији. Од временских и просторних скала које одговарају сеизмичким профилима у последњих двадесет година метода је нашла примену на скалама које одговарају бушотинским подацима или изданцима. Као најпогоднији седименти за овај тип истраживања су се показали карбонати јер су осетљиви на еустатичке промене, а основе секвенционе стратиграфије ...... 2006). Терминологија и основни модели у оквиру секвенционе стратиграфије су засновани на проучавању силицикластичних система и све до 80-их година прошлог века исти модели су се примењивали на карбонатне системе. Прву значајну модификацију силицикластичног модела ка карбонатним направио је SARG (1988) ...
... осамдесетих година прошлог века. Иако постоји општи модел који се користи у секвенционој стратиграфији, услед одређених недоумица поставља се питање да ли је уопште могуће увести један униформан општи модел. У поједностављеном облику модел је приказан на Слици 1, и ослања се на промену нивоа мора ...
... 1, Табела 1). Општи модел је представио CATUNEANU (2019) интеграцијом модела различитих аутора (Слика 1; MITCHUM et al., 1977; VAN WAGONER et al., 1988; HUNT and TUCKER, 1992; GALLOWAY, 1989; JOHNSON and MURPHY, 1984; и др). 69 Слика 1. Поједностављени основни модел секвенционе стратиграфије ...Jelena Stefanović, Dejan Radivojević. "High-resolution sequence stratigraphy of carbonates - theory and examples" in Zapisnici Srpskog geološkog društva za 2020. godinu, Srpsko geološko društvo (2020)