Претрага

Упит dcterms_subject_txt:numeriki modeli,neuronske mreže

860 items

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... 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 place in creating mathematical content. However, creating mathematical content usually requires specific ...
    ... N., Shafer, K. G., Driskell, S. O., Harper, S. R., Johnston, C., & Kersaint, G. “Mathematics teacher TPACK standards and development model”. Contemporary Issues in Technology and Teacher Education, vol. 9(1), pp. 4-24, Oct. 2009. [8] “OER in Mathematics, A free and open set of pr ...
    ... Z., & Tang, Z. “The Math Retrieval System of ICST for NTCIR-12 MathIR Task”, In Proc. NTCIR-12, 2016, pp. 318-322. [11] Kohlhase, M. A. “Data Model and Encoding for a Semantic, Multilingual Terminology of Mathematics”, in Proc. International Conference on Intelligent Computer Mathematics, ...

  • Analiza pouzdanosti dozera angažovanih na površinskim kopovima RB Kolubara

    Filip Miletić, Dragan Milčić, Miloš Tanasijević, Miloš Milovančević (2021)
    U radu je izvršena uporedna analiza pouzdanosti transportnih sistema dozera koji rade na površinskim kopovima Rudarskog basena Kolubara. Period za koji je vršena analiza je prvih deset godina eksploatacije. Efikasnost tehnološkog procesa na otkopavanju korisne mineralne sirovine i otkrivke u velikoj meri zavisi od rada dozera. Iskorišćene su matematičke metode za aproksimaciju i identifikaciju zabeleženih vremena u radu, kako bi se dobili analitički pokazatelji pouzdanosti. Na ovaj način se bitno podiže kvalitet upravljanja procesom eksploatacije i održavanja mašina na ...
    dozeri, pouzdanost, kolubarski ugljeni basen
    ... (Regression analysis) [8] i grafički. Analitički postupak daje nešto tačnije rezultate. Primenom grafičkih metoda može se oceniti tačnost razvijenog modela zakona raspodele i proceniti parametri raspodele. [9] Funkcija pouzdanosti Re (t) ima oblik: Funkcija verovatnoće otkaza Fe (t): Dvostrukim loga ...
    ... ucrtane tačke mogu dobro aproksimovati pravom linijom, odnosno ako se tačke nalaze na pravoj liniji ili se gomilaju oko prave linije, pretpostavljeni model zakona raspodele je dobar. U protivnom se odbacuje hipoteza o pretpostavljenom zakonu raspodele. U nastavku rada predstavljeni su osnovni rezultati ...
    ... radu, 2017.; [5] Maksimović S. Sistem menadžmenta kvaliteta i preventivno održavanje, 32 Konferencija o kvalitetu, Kragujevac, 2005.; [6] Tomašević M. Model za donošenje odluka u procesima prepoznavanja tipa funkcije pouzdanosti brodskih postrojenja, Doktorska disertacija, Univerzitet u Novom Sadu, Tehnički ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... distributed at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis and visualization that ...
    ... boreholes at a close distance. The survey was carrled out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. In these investigations, there was a need to carry Oout exXploratory drilling:at greater depths, in the ...

  • Ground surface subsidence monitoring using sentinel-1 in the “Kostolac” open pit coal mine

    Zoran Gojković, Milan Kilibarda, Ljiljana Brajović, Miloš Marjanović, Aleksandar Milutinović, Aleksandar Ganić (2023)
    Open pit coal mining affects surrounding populated areas, resulting in terrain surface deformation. Surface deformation should be monitored as often as possible to control deformations and prevent potential incidents. This paper analyzes time series deformation estimated from the Sentinel-1 satellite images using the Persistent Scatterer Interferometry method to monitor subsidence rates caused by open pit mining activities. It is possible to measure deformations using classical geodetic methods, but those are rarely used in practice because they are time-consuming and ...
    Sentinel-1 InSAR, слегање, рударствo, интерферометрија, даљинска детекција, Костолац

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... osvetljenje i rezoluciju za snimanje oko 10 m u prečniku, a neki modeli i znatno više. Kompletan tok snimanja karstnog podzemlja se direktno posmatra na površini terena. Jedan od najnaprednijih modela koji poseduje CHK je model video-endoskopske kamere sa rotacionim objektivom. CHK poseduje: ...
    ... nauke i prosvete, br 176022, „Ocena uticaja klimatskih promena na vodne resurse Srbije“, Min. nauke i prosvete, br 37005, Formiranje nove proširene mreže monitoringa podzemnih voda Srbije i „Operativni monitoring podzemnih voda Republike Srbije“ Ministarstvo zaštite životne sredine Republike Srbije ...
    ... prilikom održavanja kursa IRCK 2015 Members of CKH during IRCK course 2015 (levo) and LJj. Vasić "excellent trainee" B. Petrović je, preko CEEPUS mreže, posetio Departman za geologiju (primenjena geologija, hidrogeologija), Univerziteta Ftvoš Lorand (ELTE), Budimpešta, Mađarska, tokom februara 2016 ...

  • Punctuated, episodic magmatism and mineralization of the Rogozna skarn-hosted Au-Zn-Pb-Cu deposits revealed through high-precision U-Pb zircon geochronology

    Sean P. Gaynor, Milorad D. Antić, Vladica Cvetković, Kristina Šarić, Urs Schaltegger (2023)
    The subvolcanic regions of magmatic centers are commonly associated with alteration, mineralization, and economic ore deposits, however the duration and frequency of mineralizing pulses within the overall lifespan of these centers can be poorly defined. Therefore, models for the formation of mineral systems require more highprecision geochronology data to refine their evolutionary models. Rogozna Mountain and its eponymous magmatic complex, located in SW Serbia, hosts multiple base metal deposits associated with variable rock types and structural expressions and serves as a natural laboratory to ...
    Skarnovska mineralizacija, Magmatsko-hidrothermalni sistemi, Subvulcanske intruzije, geohronologija na cirkonima, CA-ID-TIMS

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... It is important to point out that the defined model can be used in all planning and exploitation phases of an open pit mine, regardless of whether it is a new mine or an open mine where exploitation is carried out. The iterative nature of the model enables corrective measures during the implementation ...
    ... overall effectiveness and efficiency of the implementation of open pit reclamation. In the process of planning, i.e. selection of the reclamation model on which all further planning activities depend, can be used various multi-criteria decision-making methods such as Promethee, AHP, TOPSIS. Decision ...

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • Building learning capacity by blending different sources of knowledge

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Dalibor Vorkapić (2016)
    ... metadata model is given in Figure 2. 1 ftp://ftp.fao.org/gi/gil/gilws/aims/metadata/docs/learnap.pdf Title Figure 2: Metadata model for BAEKTEL ...
    ... Initiative developed supplementary DC elements for their description, and proposed the addition of a number of LOM elements to further enhance the DC model. Recommendations of the DC Education Working Group are followed by several metadata initiatives. Within BAEKTEL, an analysis was performed ...
    ... bottleneck of the entire system. As a result of an in-depth analysis of metadata requirements for BMP in view of the existing standards, a metadata model was defined based on DC with addition of some elements from LOM. The selected metadata set is expected to describe the resources sufficiently well ...

  • Bridging Computational Lexicography and Corpus Linguistics: A Query Extension for OntoLex-FrAC

    Christian Chiarcos, Ranka Stanković, Maxim Ionov, Gilles Sérasset (2024)
    OntoLex, dominantni standard zajednice za mašinski čitljive leksičke resurse u kontekstu RDF-a, Linked Data i tehnologija Semantičkog veba, trenutno se proširuje sa posebnim modulom za Frekvencije, Primere i Informacije zasnovane na Korpusu (OntoLex-FrAC). Predlažemo novi komponent za OntoLex-FrAC, koji se bavi inkorporacijom korpusnih upita za (a) povezivanje rečnika sa korpusnim mašinama, (b) omogućavanje RDF baziranih web servisa da dinamički razmenjuju korpusne upite i podatke odgovora, i (c) korišćenje konvencionalnih upitačkih jezika za formalizaciju unutrašnje strukture kolokacija, skica reči i ...
    standardizacija, digitalna leksikografija, OntoLex, upiti korpusa, povezani podaci, Lingvistički povezani otvoreni podaci

  • Novi pristup proučavanju tekstura minerala značajnih za istraživanje rudnih ležišta

    Aleksandar Pačevski (2022)
    ... metoda mikroanaliza minerala moguće je izvršiti samo njihovim kombinovanjem i oslanjanjem na osnovna ispitivanja polarizacionim mikroskopom. Dobar model ovakvom pristupu istraživanja predstavlja proučavanje pirita iz polimetaličnog: Cu-Au- Ag-Pb-Zn ležišta Čoka Marin, minerala koji pokazuje veliku ...
    ... methods in the mineral studies can be achieved only by their combining and upgrading on the basic investigations by polarized light microscope. A good model for this research approach represents the study of pyrite from the polymetallic Cu-Au-Ag-Pb-Zn Čoka Marin deposit, a mineral that shows a great diversity ...

  • English for Geology Students. 1

    Lidija Beko (2023)
    Engleski jezik
    ... Udžbenik Engleski jezik 1 za geologe je univerzitetski priručnik čijije glavni cilj da obezbedi infor- mativnu bazu i bude upotrebljiv akademski model za učenje osnovnih principa i pojmova iz oblasti engleskog jezika za geologe. Čitljivim i razumljivim tekstovima, za studente koji pohađaju svoj prvi ...

  • Uticaj klimatskih promena na vodne resurse: primer sliv reke Mlave

    Vesna Ristić Vakanjac, Saša Milanović, Ljiljana Vasić, Boris Vakanjac, Saša Bakrač, Radoje Banković, Veljko Marinović (2023)
    Na teritoriji Jugositočne Evrope, pa samim tim i u delu gde živimo (Republika Srbija i Republika Bosna i Hercegovina) za očekivati je da dođe do značajnijeg porasta temperature vazduha u značajnijoj meri, što će imati značajnijeg uticaja na padavine, njihovu unutargodišnju raspodelu, kao i pojavu sve više prisutnih ekstremnih vrednosti (izuzetno sušnih i kišnih godina). Sve ovo će uticati i na sam režim površinskih i podzemnih voda, resursa bez kojih život na ovoj planeti ne bi ni postojao. Da ...

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

    Иван Обрадовић, Александра Томашевић, Ранка Станковић, Биљана Лазић (2017)
    ... е осо- бине, деформабилност стена, деформабилност тла, стабилност косина, носи- вост тла +Surveying Геодезија Предложен нови маркер рудничка мрежа, јамски полигон, нивелмански влак, рударска висећа бусола, теодолит, жиротеодолит +EnvProt Заштита животне средине Предложен нови маркер ...

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... documents on basis of the index is realized using the model of approximate matching, based on the frequency distribution of terms and documents. Two basic approaches are the vector space model, based on weight coefficients of terms, and the probabilistic model, based on relevance feedback. [14] In this paper ...
    ... works, and prospective exploration. 3 Present Solution Search of textual databases (which is in use for several years) is derived from the basic model, which is based on the input of keywords, single or multi-word units (MWU), that can be combined into Boolean expressions. In addition to general search ...

  • Strukture kristala - odabrana poglavlja iz kristalografije i njena multidisciplinarnost

    Ljiljana Karanović (2024)
    Kristalografija

  • Definisanje parametara čvrstoće na smicanje kod izvođenja kosina u ispucalom stenskom masivu

    Zoran M. Berisavljević (2016-04-01)
    Definisanje parametara čvrstoće na smicanje ispucalih stenskih masa predstavlja jedanod najzahtevnijih zadataka mehanike stena. Geotehnička istraživanja su uglavnomograničena na rezultate laboratorijskih ispitivanja malih makroskopski homogenihuzoraka, sa kojih se vrši ekstrapolacija rezultata na terensku razmeru. Ispitivanja semogu vršiti in situ, ali su i ona ograničena veličinom korišćene aparature imikrolokacijom na kojoj se vrše ispitivanja. Pored toga, moguće je vršiti različitaispitivanja na fizičkim modelima, koja su veoma složena i skupa. Ekstrapolacijapodataka sa malog uzorka na terensku razmeru daje mnogo bolje rezultate ...
    naponsko stanje, ispucalost, heterogenost, čvrstoća na smicanje, geološki indeksčvrstoće, Hoek-Brownov materijal, kompozitni uzorci, dezintegracija, povratna analiza

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... several manners. Zhao et all (2015) modelled a stockpile as a grid of voxels (octants), associated with machine operations.Their 3D quality embedded model can be used to calculate, plan, control and predict the quality of ore being stacked and/or reclaimed with a great degree of accuracy. Robinson ...
    ... (Pavloudakis & Agioutantis, 2001) For "Tamnava Zapodno-Polje" a simulation was run on a small test site using data from the technological block model, as well as simulated data based on statistical parameters: average value and standard deviation. It should be pointed out that increasing the number ...
    ... continuous and discontinuous stacker operation Software application comprises the components for stacking and reclaiming, for Tamnava West using Strata model, as presented in the figure. α β α1 α2 αn ϕ Figure 43. Staking simulation PILE SIZE Variability of the geometry of each pile causes ...

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities