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Упит dcterms_subject_txt:expert system

716 items

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... partners from industry [5]. The idea of the project was to establish a system for creating, publishing, maintaining and searching of OERs both from academic institutions and enterprises. An important part of this system is the Open edX platform, which was adapted for the needs of BAEKTEL project ...
    ... required, which http://tpack.org/ inform the system that there is a mathematic formula (Image 5). MathJax presents a cross-browser JavaScript library that displays mathematical notation in web browsers using LaTex document preparation system. Image 5: Example of tasks editing ...
    ... progress [6]. Experts stress the importance of using TPACK framework (Image 4) in creating mathematical 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 ...

  • Hypogene speleogenesis related to porphyry magmatic intrusions and its influence on subsequent karst evolution in the Peruvian high Andes

    Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre (2022)
    Earth-Surface Processes

  • Hypogene karst associated with igneous intrusions and its influence on the subsequent karst evolution in high mountains (Central Andes, Peru)

    Alexander B. Klimchouk, Saša Milanović, Cristian Bittencourt (2021)
    Carbonate rocks of Cretaceous age are wide spread in the Peruvian Andes. The studied area in the eastern part of the Cordillera Occidental, near a large igneous intrusion and a skarn deposit, exemplifies polygenetic and multi-phase karst development. Hypogene karstification is related to a hydrothermal activity associated with a magmatic event at ca. 11-9.7 Ma responsible for the emplacement of the nearby intrusion and related alteration of the carbonate rocks. It has resulted in deep-rooted, laterally isolated stair-case-rising shaft ...

  • Applying the Fuzzy Inference Model in Maintenance Centered to Safety: Case Study – Bucket Wheel Excavator

    Predrag Jovančić, Miloš Tanasijević, Vladimir Milisavljević, Aleksandar Cvjetić, Dejan Ivezić, Uglješa Bugarić (2020)

  • Hidrodinamički proračun zaštite površinskog kopa Drmno od podzemnih voda u periodu 2018-2022. godina

    Dušan Polomčić, Tomislav Šubaranović, Zoran Stojićević (2019)
    Površinski kop lignita Drmno nalazi se u blizini velikih reka (Dunav i Mlava), zbog čega eksploatacija otkrivke i lignita u velikoj meri zavisi od sistema zaštite od podzemnih voda. Ukoliko je sistem zaštite od podzemnih voda dobro isplaniran, a njegov kapacitet dobro proračunat, onda će se eksploatacija obavljati u suvoj sredini, što podrazumeva sigurnu proizvodnju otkrivke i lignita. U današnje vreme uz primenu adekvatnih softvera olakšano je kvalitetno planiranje i proračunavanje sistema za zaštitu površinskih kopova od podzemnih voda. ...
    odvodnjavanje, podzemne vode, površinski kop, lignit, Drmno

  • 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
    ... used the SEDLA expert system for the selection of artificial lift methods. This contains three modules: a module of expert knowledge, experience and theoretical knowledge; a simulation design module; and an economic evaluation module. The expert knowledge module consists of an expert knowledge base ...
    ... 16 April 2015. 27. Aliyev, E. Development of Expert System for Artificial Lift Selection. Master’s Thesis, Middle East Technical University, Ankara, Turkey, February 2013. 28. Bowles, J.B.; Peláez, C.E. Fuzzy logic prioritization of failures in a system failure mode, effects and criticality analysis ...
    ... been applied. In practice, there is no general model and standard for the selection of artificial lift methods, but each oil company uses an expert system, i.e., programs, or tables with defined application limits for each method. The conventional methodology for selecting an appropriate artificial ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Challenges in using wastewater heat pumps in district heating systems

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović, Dimitrije Manić (2022)
    Decarbonization of district heating systems requires ensuring significant amounts of renewable energy available in the proximity of the district heating network. One of the promising solutions is the utilization of purified water from wastewater treatment plants by heat pumps. However, as a heat source, wastewater treatment plants are characterized by annual variability of the flow and temperature of purified water. The consequence is the variability of recoverable heat potential. In this paper, the effect of variability is analyzed for ...
    Toplotna pumpa, Daljinsko grejanje, Postrojenje za prečišćavanje otpadnih voda

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... is used [2, 5]. Life cycle of a machine, facility or any other technical system has a complex structure, and it encompasses several distinctive but interrelated and timely adjusted groups of activities. Technical system is used only during one part of own life cycle, therefore, time it is used is ...
    ... machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity ш таноп ој the continuous system јог the excavatioh ој coal апа tailings, which indicafes their importance. More than 100 bulldozers have been hired оп the ореп-сазт lignite mines ...
    ... machines (bucket wheel excavators, belt conveyors and stackers). It also should be noted that one hour of bucket wheel excavator — belt conveyor — stacker system operation is valued at several thousands of euros, and that value on one hour of dozer operation is below 100 €. Hence, it is more important that open-cast ...

  • Challenges of Energy Transition in the Individual Heating Sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2022)
    U radu su prikazani rezultati istraživanja i ankete koja je sprovedena 2020. godine u domaćinstvima sa individualnim sistemima grejanja u Srbiji. Cilj ankete je bio da se sagleda stanje individualnih sistema grejanja, ali i stavovi vlasnika sistema vezano za energetsku tranziciju. Rezultati ukazuju na zastarelost sistema grejanja, nisku efikasnost, nedovoljna ulaganja u primenu mera energetske efikasnosti i nedostatak finansijskih sredstava za ulaganje u održivo grejanje. Osnovni prioriteti kod izbora načina grejanja jesu troškovi kupovine sistema i troškovi energenta, dok ...
    Energetska tranzicija, Individualni sistemi grejanja, Stavovi domaćinstava, Anketa, Srbija

  • Against the tide: southeast to northwest shelf-edge progradation in the southeastern margin of Lake Pannon, Banat (Serbia and Romania)

    Dejan Radivojević, Miloš Radonjić, Lajos Tamás Katona, Imre Magyar (2022)
    In the late Neogene, the Pannonian Basin in Central Europe was filled with sediments when rivers from the Alps and Carpathians shed their sediment load into Lake Pannon. The most powerful source-to-sink system was that of the paleo-Danube, transporting sediments from the NW as far as the southeastern part of the lake. In the southeastern margin of the basin, however, local sedimentary systems worked in the opposite direction, against the “tide” of the prevailing N to S sediment transport. ...
    General Earth and Planetary Sciences

  • To what extent reactivated faults are (not) responsible for karst process: example from Serbian Carpatho-Balkanides?

    Ana Mladenović, Jelena Ćalić (2023)
    Carpatho-Balkanides represent part of the complex Dinaric – Carpatho – Balkan orogenic system, that geomorphologically dominates the central part of the Balkan Peninsula. The existence of this orogenic system is a result of closure of the Neotethys ocean and subsequent convergence of the Adriatic microplate and the Eurasian continent, that has been still active in the recent times. Such geodynamic characteristics conditioned complex tectonic structures, multiply reactivated during Late Cretaceous and Cenozoic times. The main aim of this work ...
    Carpatho-Balkanides, karst caves, reactivated faults, transpressional tectonics

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... Key words: Open educational resources, BAEKTEL, metadata portal 1. CASE OVERVIEW The educational system in Serbia, in accordance with the Law on the Basis of the Education System (Official Gazette of RS, No. 68/2015), comprises the following levels: 1.Pre-school education ...
    ... international openness of the higher education system”. Article 4, which outlines the principles on which higher education is based, in Item 5 stipulates “openness towards general public and all citizens” and in Item 8 “harmonization with the European system of higher education and enhancement of academic ...
    ... any media, which can support education. The BAEKTEL metadata platform development is based on the open source Digital Asset Management (DAM) system ResourceSpace, relying on PHP backend, MySQL database and the GD Graphics Library (http://www.resourcespace.org/) 4 Chapter # - will be assigend ...

  • An Integrated Environment for Management and Exploitation of Linguistic Resources

    Ranka Stanković, Ivan Obradović (2009)
    ... The procedure for automatic construction of entries for a DELAC dictionary is based on a set of rules [10]. The rule design strategy results from expert knowledge on morpholo- gy and the analysis of an already existing, manually created compound dictionary. The task of the rule based procedure ...
    ... Serbian developed within the HLT Group. Namely, the system of morphological dic- tionaries of Serbian, the Serbian wordnet, and parallel and aligned texts. They are the basic resources around which the WS4LR and WS4QE tools were built. A. The system of morphological dictionaries The format chosen ...
    ... still under de- velopment, their dimensions are currently more modest. The aforementioned dictionaries compose the system of morphological dictionaries of Serbian – SMD. This system of dictionaries is extremely important given the very rich morphology Serbian shares with other Slavonic languages ...

  • Extraction of Bilingual Terminology Using Graphs, Dictionaries and GIZA++

    Branislava Šandrih, Ranka Stanković (2020)
    U nauci, industriji i mnogim istraživačkim oblastima, terminologija se brzo razvija. Najčešće, jezik koji je „lingua franca“ za većinu ovih oblasti je engleski. Kao posledica toga, za mnoga polja termini domena su koncipirani na engleskom, a kasnije se prevode na druge jezike. U ovom radu predstavljamo pristup za automatsko izdvajanje dvojezične terminologije za englesko-srpski jezički par koji se oslanja na usaglašeni dvojezični korpus domena, ekstraktor terminologije za ciljni jezik i alat za usklađivanje delova. Ispitujemo performanse metode na domenu ...
    ekstrakcija terminologije, validacija terminologije, GIZA++, grafovi, Unitex, klasifikacija teksta
    ... text. The only system developed specifically for the extraction of MWTs from Serbian texts is a part of LeXimir (Stanković et al., 2016), a tool for management of lexical resources. LeXimir consists of two modules for the terminology extraction. The first module is a rule-based system re- lying on e ...
    ... the basis of bilingual, aligned, domain-specific textual re- sources, a terminological list and/or a term extraction tool in a source language, and a system for the extraction of terminology- specific Multi-Words Terms in a target language, it is possible to compile a bilingual aligned terminological list ...
    ... several cases, the bilingual lists of MWTs were compiled in order to im- prove statistical machine translation (SMT) of an existing machine transla- tion system (Bouamor et al., 2012; Tsvetkov and Wintner, 2010; Naguib Sab- tan, 2016; Irvine and Callison-Burch, 2016; Semmar, 2018; Hewavitharana and Vogel, 2016; ...

  • The lost freshwater goby fish fauna (Teleostei, Gobiidae) from the early Miocene of Klinci (Serbia)

    Katarina Bradić-Milinović, Harald Ahnelt, Ljupko Rundić, Werner Schwarzhans (2019)
    Freshwater gobies played an important role in the Miocene paleolakes of central and southeastern Europe. Much data have been gathered from isolated otoliths, but articulated skeletons are relatively rare. Here, we review a rich assemblage of articulated gobies with abundant otoliths in situ from the late early Miocene lake deposits of Klinci in the Valjevo freshwater lake of the Valjevo-Mionica Basin of Serbia. The fauna was originally described by Anđelković in 1978, who noted many different fishes, including one ...
    Gobiidae, Klincigobius, Rhamphogobius, Toxopyge, Otoliti in situ, Srpski jezerski sistem

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... Devonian (late Frasnian) to the Early Carboniferous (Vi- séan) as a part of the circum Pannonian flysch system (EBNER et al., 2008). The Kučaj-Zvonce flysch was interpreted as a retro- grading system of deposits of the slope to mid-fan and the outer- fan to basin tract (KRSTIĆ et al., 2004). The Bouma ...
    ... the succession is truncated by a system of brittle, dextral strike-slip faults (Fss in Fig. 2). Movement along these faults can be concluded based on the Riedell’s plains and folding related to the faulting process. The amount of displacement along the Fss system could not be established with precision ...
    ... unit D. In terms of the lateral geometry of the proposed system at the Kostadinovica section, the change to more fine-grained litho- logies should mark the shift away from the central zone of super- imposed channel axes towards lobes of the system (from unit A towards unit C), while the opposite shift ...

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists
    ... out that expert had that 56.6% of literals in produced Serbian synset were literals offered by the system. Also, approximately one half of synset definitions in Serbian offered by the system did not need corrections, or the corrections were moderate. We can thus conclude that the system developed ...
    ... specific synset. Column domain shows the synset domain from PWN and is used to check whether the synset has been assigned to the appropriate domain expert. In order to reduce false alignments due to homographs, we introduced a constraint to check whether the POS mark for the PWN synset and the POS of ...
    ... Serbian morphological dictionaries (Krstev et al., 2010), if this term was found in the dictionary. Definition in English DefEn is intended to help the expert in correcting the definition in Serbian DefSr if needed, as the latter is generated using the Translation API, and is in general subject to post- ...