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Упит dcterms_subject_txt:2D geološko-geofizički model

3734 items

  • Development of integrated fuzzy model for mine management optimization

    Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)
    fuzzy logika, višekriterijumsko odlučivanje, ocenjivanje eksperata
    ... integrated fuzzy model for mine management optimization Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Development of integrated fuzzy model for mine management ...
    ... to facilitate decision making with a fuzzy optimization model. Scores are entered and pairs compared in the application, and otherwise extensive mathematical calculations are simplified. It is also easy to monitor the sensitivity of the model to input parameter variation. On a much higher level ...
    ... Comptes rendus de PAcadćmie bulgare des Sciences Tome 76, No 9, 2023 ENGINEERING SCIENCES Mining engineering DEVELOPMENI OF IN TEGRATED FUZZY MODEL FOR MINE MANAGEMENT OPTIMIZATION Miodrag Čelebić*, Sanja Bajić**, Dragoljub Bajić***", Dejan Stevanović**, Duško Torbica*, Vladimir Malbašić* ...

  • 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
    ... the model that employs all 13 features, which is deemed the overall better model, requires approxi- mately 55% more computational time than the model that employs the same dataset but only the five most informative features. To fully quantify the performance of the RF_C_100_5MI model, a ...
    ... to train and test the KNN model using only the five most informative features, as it operates more efficiently on lower dimensional data (i.e., with fewer features), it was ultimately exceeded by the RF model. However, in contrast to the KNN model, the RF model exhibits mode robustness towards ...
    ... fault map, digi- tal elevation model, and BR3 map are the most significant features for predicting ophiolites. The statistical metrics of the model that incorporated all 13 features were better. However, the RF model that employed all features and the model that utilized only the five most ...

  • Advancing Sentiment Analysis in Serbian Literature: A Zero and Few-Shot Learning Approach Using the Mistral Model

    Milica Ikonić Nešić, Saša Petalinkar, Mihailo Škorić, Ranka Stanković, Biljana Rujević (2024)
    Ova studija predstavlja analizu sentimenta srpskih starih romana iz perioda 1840-1920, koristeći veliki jezički model (LLM) Mistral za tehniku učenja sa zasnovani na takozvanim "zero" i "few-shot" pokušajima. Glavni pristup uvodi inovacije osmišljavanjem istraživačkih upita (promptova) uključuju tekst sa uputstvom za klasifikaciju bez primera i na osnovu nekoliko primera, omogućavajući jezičkom modelu da klasifikuje osećanja u pozitivne, negativne ili objektivne kategorije. Ova metodologija ima za cilj da pojednostavi analizu osećanja ograničavanjem odgovora, čime se povećava preciznost ...
    zero-shot, few-shot, sentiment, Serbian, Mistral model

  • 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
    ... Измењено: 2023-10-14 04:10:15 A Fuzzy Expert Model for Availability Evaluation Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] A Fuzzy Expert Model for Availability Evaluation | Dejan Ivezić, Miloš ...
    ... III. AVAILABILITY ASSESSMENT MODEL Figure 1 shows the conceptual model of the expert system for availability (A) evaluation based on fuzzy interference of reliability (R), maintainability (M) and supportability (S) input data. Input data are introduced to a model based on experts’ opinions. ...
    ... but requires specific, quite complex IT system. Therefore, in this paper, an expert model, that integrates reliability, maintainability, and supportability in the measure of availability is proposed. This model is based on fuzzy sets theory and it is implemented to three types of bulldozers that ...

  • Regional rockfall exposure assessment, experience from Serbia

    Miloš Marjanović, Biljana Abolmasov, Uroš Đurić, Jelka Krušić, Snežana Bogdanović (2022)
    Rockfalls are common in hilly and mountainous areas, especially along roads with engineered slopes and cuts. Such is the case for most of the state and local road routes in Central, Serbia, which was the subject in this case study. A road network of 276 km covering roughly 1700 km2 between the cities of Kraljevo, Čačak and Ivanjica is presented. Assessing of such wide areas needs to be conducted from large to site-specific scale, i.e., using GIS spatial tools ...
    CONEFALL, izloženost, GIS, odronjavanje, Srbija

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA

  • Electronic Dictionaries - from File System to lemon Based Lexical Database

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Mihailo Škorić (2018)
    In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...
    ... e-dictionaries to XML files compliant to LMF model, but further exploitation of these files was not implemented, neither for lexical database development nor for further processing (Stanković et al., 2013). Finally we considered the lemon model (Lexicon Model for Ontologies), which was derived from ...
    ... The main advantage of the lemon model for the research outlined in this paper was its support for linking with other (lexical) data and the possibility to access data by using the standardized SPARQL query language. The model pre- sented is based on the lemon model, but some modifica- tions and ...
    ... presented a new database model, developed upon the lemon model, as well as its application for mi- grating electronic morphological dictionaries from a single- user file system to a multi-user environment based on a re- lational database management system. The new lexical data model implemented as a lexical ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

    Љупко Рундић, Мери Ганић (2020)
    Еоцен, крупни мекушци, нумулити, ЈЗ Сирт басен, Либија

  • Sitni, ali bitni: uloga sitnih sisara, herpetofaune i mekušaca u rekonstrukciji pleistocenskih paleosredina

    Katarina Bogićević, Draženko Nenadić, Dragana Đurić, Mihajlo Jovanović, Aleksandra Savković (2023)
    Fosilni ostaci životinja i biljaka imaju važnu ulogu u rekonstrukciji pleistocenskih paleosredina. U ovom radu opisan je značaj tri grupe životinja: sitnih sisara, herpetofaune I mekušaca. Mada je za rekonstrukciju važan sastav čitave asocijacije, nalasci pojedinih vrsta mogu biti dovoljno indikativni da otkriju tip staništa ili klimatske uslove. Posebnu teškoću pri rekonstrukciji paleosredina u Srbiji predstavlja činjenica da klimatske promene na Balkanskom poluostrvu nisu bile tako oštre kao u srednjoj i zapadnoj Evropi, pa ne postoji drastična razlika u ...
    ... Dr.sc. Stjepan Ćorić (Geološki zavod Austrije) Dr.sc. Miloš Bavec (Geološki zavod Slovenije) Prof. dr.sc. Slobodan Miko (Hrvatski geološki institut) Prof. dr.sc. Dragoman Rabrenović (Geološki zavod Srbije) Prof. dr.sc. Tea Kolar-Jurkovšek (Geološki zavod Slovenije) Prof. dr.sc. Ljupko Rundić ...
    ... (Rudarsko geološko građevinski fakultet Tuzla) Profesor emeritus Izet Žigić (Rudarsko geološko građevinski fakultet Tuzla) Prof. dr.sc. Zoran Stevanović (Rudarsko geološki fakultet Beograd) Prof. dr.sc. Ranko Cvijić (Rudarski fakultet Prijedor) Prof. dr.sc. Dinka Pašić-Škripić (Rudarsko geološko građevinski ...
    ... oštarić (Rudarsko geološko naftni fakultet Zagreb) Prof. dr.sc. Zoran Nakić (Rudarsko geološko naftni fakultet Zagreb) Prof. dr.sc. Đenari Ćerimagić (Građevinski fakultet Sarajevo) Doc. dr.sc. Boško Vuković (Rudarski fakultet Prijedor) Dr. sc. Slobodan Radusinović (Geološki zavod Crne Gore) ...

  • Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex

    Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)
    Timok Magmatic Complex, Neotethys subduction, basin geodynamics, analogue modelling

  • Concepts for Improving Machine Learning Based Landslide Assessment

    Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić (2019)
    Katastar klizišta, Podložnost, Hazard, Mašinsko učenje, Uzorkovanje, Validacija

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција

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

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... role in performing the evaluation of a project is played by the Evaluation Model (EM). EMs are approaches that assist evaluators in designing and carrying out useful, effective evaluations [19]. The terms approach and model, referred to evaluation are often used in an alternative way, although ...
    ... and causal links among activities, resources, outputs, purposes of the project proposal. The paper highlights peculiarities and weaknesses of this model for an effective evaluation. Keywords: E-Learning project, Evaluation, Logical framework approach. 1. INTRODUCTION Evaluation of E-learning ...
    ... with the evaluation of E- Learning Project,; section 4 reports the application of the LFA to an E-Learning project as prospective evaluation model; section 5 outlines implications and presents some conclusions for the research. 2. EVALUATION OF PROGRAM AND PROJECTS The scientific debate ...

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... (Brazil et al. 2003; 2008). In our model we defined spatial network by nonlinear constrained objective function representing the cost of mine development and ore haulage. To find the minimum value of the objective function we use Genetic algorithm. 2. THE MODEL OF A DECLINE DEVELOPMENT SYSTEM ...
    ... Such network is defined by adequate objective function. Optimisation model is based on the minimisation of the nonlinear constrained objective function representing the cost of mine development and ore haulage. The model is not closed and allows the underground mining engineers to incorporate ...
    ... sections. Access infrastructure designing can be treated as spanning the spatial network which will connect all main terminals (points). In our model we defined spatial network by adequate nonlinear constrained objective function representing the cost of mine development and ore haulage. To find ...

  • Numerical simulation of the Late Jurassic closure of the Vardar Tethys

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2021)
    ... 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 ...
    ... the 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 ...

  • 2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2020)
    ... Измењено: 2023-10-14 04:27:26 2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys Nikola Stanković, Vesna Cvetkov, Vladica Cvetković Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] 2D Numerical Simulation of ...
    ... 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 ...
    ... the 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 ...

  • Geotehnički uslovi izgradnje metro stanice "Francuska" u Beogradu

    Lazar Pavlović (2024)
    Cilj ovog rada je analiza stabilnosti dijafragme, predviđene kao mere za obezbeđenje dubokog iskopa od zarušavanja okolnog tla koji se izvodi na mestu buduće metro stanice “Francuska” koja je planirana u okviru prve faze, prve linije metroa u Beogradu – sekcije „Centar“. U okviru numeričke analize je izvršena analiza stabilnosti konzolne dijafragme kao i dijafragme sa ankerom – slobodno oslonjene dijafragme, kako bi se moglo napraviti poređenje dobijenih vrednosti koje se odnose na dubinu fundiranja koja je potrebna da ...
    istraživanja, metro stanica, iskop, dijafragma
    ... OMp)'D = ', (43.38D + 105.7 – 105.7) · D = 2: 43.38D · D = 10.84D? = 10.84 · (20.0512)? = 10.84 · 402.05 = 4358.22 kN/m! dj= - ha+h +ha+h,+2D=65-5+1+4.5+11+2D=18+2D = 18 + Š 20.0512 = 18 + 13.37= 31.37m 72 Ž Mu=0 Eal i dal + Eaz i daz + Ea3 i da3 + Ea4 i da4 + EaS i daS + Ea6 i dać + Ea7 i da7 ...
    ... (159 + 8.32D – 159) · D = 0.5· 8.32D · D = 4.16D? = 4.16 · (20.0512)? = 4.16 · 402.05 = 1672.53 kN/m! dao= - ha+ha+ha +h,+1D=65-5+1+45+11+21D=18+2D = 18 +Š- 20.0512 = 18 + 13.37 = 31.37 m 71 Proračun pasivnog pritiska tla sa leve strane dijafragme: + Koeficijent pasivnog pritiska tla: ...
    ... Komisija: 1. Prof. dr Gordana Hadži - Niković, menfor Rudarsko — geološki fakultet, Beograd 2. Prof. dr Dragoslav Rakić, član Rudarsko — geološki fakultet, Beograd 3. Doc. dr Dušan Berisavljević, član Rudarsko — geološki fakultet, Beograd Datum odbrane: Rezime: Cilj ovog rada je analiza ...

  • 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

  • Konzervacija miocenskih kičmenjaka sa lokaliteta Riđake (severozapadna Srbija) iz zbirke Prirodnjačkog muzeja u Beogradu

    Nenad Mladenović (2024)
    U radu je opisana geološka građa terena i metode koje se koriste u paleontologiji za izdvajanje, konzervaciju i restauraciju fosilnog materijala sa lokaliteta Riđake kod Šapca. Prikazana je anatomija fosilnih kičmenjaka. U prosejanom sedimentnom materijalu težine od 4kg pronađeno je 10,798 kostiju, uključujući ostatke Pisces (riba) Amphibia (vodozemaca), Reptilia (gmizavaca), Aves (ptica) i Mammalia (sisara).
    geološka građa, konzervacija, restauracija, Riđake, fosili kičmenjaka
    ... Beogradu, Rudarsko-geološki fakultet. str. 1-143., Beograd. Filipović, L, Gagić, N., Rodin. V. ı Avramović. V. (1967): Tumač za list Vladimirci L 34-124 . Zavod za geološka i geofizička istraživanja. str. 1-51., Beograd. Mitrović, J. i Pavlović, M. (1980): Paleozologija. Rudarsko-geološki fakultet - ...
    ... Rudarsko-geološki fakultet, Beograd 2. Član komisije: dr Jelena Milivojević, vanr. prof. Rudarsko-geološki fakultet, Beograd 3. Član komisije: dr Zorica Lazarević, vanr. prof. Rudarsko-geološki fakultet, Beograd Datum odbrane: 30.09.2024. SAŽETAK U radu je opisana geološka građa terena ...
    ... GRAĐA U granicama lista Šabac, oko 80% terena pokriva kvartarni sloj, što otežava geološka istraživanja koja se oslanjaju na manji broj otkrivenih izdanaka i podatke dobijene bušenjem (Filipović i dr. 1967). Geološka struktura uključuje neogene sedimente, silifikovane i dolomitične krečnjake iz ...