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Упит dcterms_subject_txt:economical evaluation

354 items

  • 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
    ... [9]. The module of economic evaluation uses detailed designing equipment, surface and underground equipment, energy supply, and previously determined optimal production to calculate the profitability of each method. The calculations used are standard project evaluation parameters: net present value ...
    ... 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, i.e., the knowledge of nine world-recognized experts from certain fields ...
    ... used a “decision tree” to choose artificial lift methods, where the main factor was long-term economic analysis. Other factors that influence the evaluation of the method are operational costs, primary investments, costs during the working life and energy efficiency. Three steps were taken through the ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic

  • Knowledge and Rule-Based Diacritic Restoration in Serbian

    Cvetana Krstev, Ranka Stanković, Duško Vitas (2018)
    In this paper we present a procedure for the restoration of diacritics in Serbian texts written using the degraded Latin alphabet. The procedure relies on the comprehensive lexical resources for Serbian: the morphological electronic dictionaries, the Corpus of Contemporary Serbian and local grammars. Dictionaries are used to identify possible candidates for the restoration, while the dataobtainedfromSrpKorandlocalgrammarsassistsinmakingadecisionbetween several candidates in cases of ambiguity. The evaluation results reveal that,dependingonthetext,accuracyrangesfrom95.03%to99.36%,whilethe precision (average 98.93%) is always higher than the recall (average 94.94%).
    diacritic restoration, morphological dictionary, corpus, word n-grams, local grammars
    ... It also contains the Sociopolitical thesaurus as a part because scientific and technological problems can be discussed together with political, economical, indus- trial, and other issues (Dobrov and Loukachevitch, 2006); • Security Thesaurus is an extension of the RuThes thesaurus and includes terminology ...
    ... and Loukachevitch, N. (2006). Development of linguistic ontology on natural sciences and technology. In Proceedings of Linguistic Resources and Evaluation Conference, pages 1077–1082. Fellbaum, C., Ed. (1998). WordNet: An Electronic Lexical Database. Cambridge, MA: MIT Press. Gelfenbeyn, I., Goncharuk ...
    ... Some ontological principles for designing upper level lexical resources. In Proceedings of First International Conference on Language Resources and Evaluation LREC-1998, pages 28–30. Guizzardi, G. (2011). Ontological foundations for conceptual part-whole relations: the case of collectives and their parts ...

  • The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines

    Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan (2008)
    In this paper we present how resources and tools developed within the Human Language Technology Group at the University of Belgrade can be used for tuning queries before submitting them to a web search engine. We argue that the selection of words chosen for a query, which are of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources, such as morphological dictionaries and wordnets. These dictionaries enable semantic ...
    LR web services, MultiWord Expressions & Collocations, Information Extraction, Information Retrieval
    ... Performance of Web Search Engines | Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan | LREC 2008: Conference on Language Resources and Evaluation, Marrakesh, Morocco, May 2008 | 2008 | | http://dr.rgf.bg.ac.rs/s/repo/item/0004838 Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...
    ... Obradović, I. (2006). WS4LR: A Workstation for Lexical Resources, Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2006, Genoa, Italy, May 2006, pp. 1692-1697 Krstev, C., Vitas, D., Maurel, D., Tran, M. (2005). Multilingual Ontology of Proper Names ...

  • 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
    ... after 8% year ог operation, while Shanghai PD320Y-1 dozer after 3“ уеаг ог operation. 291 4. CONCLUSION Analysis showed that profit life (economical life) of dozer CAT D8R operating on open-cast mines of EPS is around 7 years, while optimal operating time from the aspect of availability is 8 years ...
    ... performed according to recommended method for evaluation of hourly ownership and operational costs, including data on auxiliary machines (Caterpillar and Komatsu methods). Integration of this information with operational conditions will enable reliable evaluation. Total costs, i.e. specific cost per moto ...

  • Paleomagnetic study of Jurassic-Early Cretaceus sediments in the Danibicum of Eastern Serbia

    Vesna Cvetkov, Emo Marton, Vesna Lesić, Dragana Tomić (2015)
    ... paleomagnetic measurements and demagnetizations. The demagnetization curves were analyzed for linear segments which were used for statistical evaluation on locality level. In order to determine if the obtained remanent magnetization for the localities is of pre or post–folding age on locality level ...

  • Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...
    Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatori

  • Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia

    Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović (2018)
    ... experiments were carried out on selected specimens. The demagnetization curves were then analyzed for linear segments which were used for statistical evaluation on locality/site level. The fold/tilt test was carried out on locality (when applicable) and regionallevel. The obtained results show that the ...

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... observation. The aspect of social indicators, with partial indicators of social acceptability and provision of comfort, is increasingly used in the evaluation of the energy scenario [11]. 3. ENVIRONMENTAL ACCEPTABILITY SYNTHESIS INDICATOR The Environmental acceptability synthesis indicator shows ...
    ... intensity by sectors, reduction of energy use (total or sectorial), etc. [11]. The indirect environmental effect parameter is quantified by expert evaluation of the indirect environmental impact of the emission. 3.1 Partial indicator GHG emissions Greenhouse gas emissions are a universal environmental ...
    ... decision-making, Renewable and Sustainable Energy Reviews, Volume 13 (9), 2009, pp. 2263-227 11. Konidari, P., Mavrakis D., A multi-criteria evaluation method for climate change mitigation policy instruments, Energy Policy, Volume 35, 2007, pp. 6235–6257 12. Scheraga, J., Leary, N., Improving ...

  • Multiword Expressions between the Corpus and the Lexicon: Universality, Idiosyncrasy and the Lexicon-Corpus Interface

    Verginica Barbu Mititelu, Voula Giouli, Kilian Evang, Daniel Zeman, Petya Osenova, Carole Tiberius, Simon Krek, Stella Markantonatou, Ivelina Stoyanova, Ranka Stankovic, Christian Chiarcos (2024)
    Predstavljamo trenutne aktivnosti na definisanju interfejsa leksikona i korpusa koji će služiti kao referenca u prikazu polileksemskih jedinica - višečlanih izraza - (različitih tipova - imenskih, glagolskih, itd.) u specijalizovanim leksikonima i povezivanju ovih unosa sa njihovim pojavljivanjima u korpusima. Konačni cilj je korišćenje ovakvih resursa za automatsko identifikovanje višečlanih izraza u tekstu. Uključivanje nekoliko prirodnih jezika ima za cilj univerzalnost rešenja koje nije usredsređeno na određeni jezik, kao i prilagođavanje idiosinkrazijama. Raspravljaju se izazovi u leksikografskom opisu višerečnih ...
    multiword expression lexicon, corpus, proof-of-concept lexicon encoding

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... 2020). Pyrolysis is the process of thermal decomposition of ker- ogen in the absence of oxygen and is particularly important for source-rock evaluation. Rock-Eval pyrolysis (Espitalié et al., 1977, 1985; Lafargue et al., 1998) has many output pa- rameters that provide useful information not only ...
    ... ¢, 2020). Pyrolysis is the process of thermal decomposition of ker- ogen in the absence of oxygen and is particularly important for source-rock evaluation. Rock-Eval pyrolysis (Espitalié et al., 1977, 1985; Lafargue et al., 1998) has many output pa- rameters that provide useful information not only ...
    ... Belgrade. Ercegovac, M. & Kostić, A., 2006. Organic facies and palynofacies: Nomenclature, classi�cation and applicability for petroleum source rock evaluation. International Journal of Coal Geology, 68: 70–78. Espitalié, J., Deroo, G. & Marquis, F., 1985. La pyrolyse Rock-Eval et ses applications. Deuxième ...

  • 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
    ... ore deposits, geological exploration has rendered syn- onymous the inherent uncertainties, vagueness, and inaccuracies. As a result, subjective evaluation by engineers and expert experience have become increas- ingly important. Given that the natural language used by miners and geologists is most ...
    ... sustainable production in the future. A case study to which the model was applied is presented in the paper. Key words: mining; technology, expert evaluation, triangular fuzzy num- bers, multicriteria, decision making, Introduction. Mine management optimization, and thus the importance of mining ...

  • 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

  • Numerical modelling of the roughly simultaneous emplacement of two distinct ophiolite belts

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)

  • A bilingual digital library for academic and entrepreneurial knowledge management

    Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić (2015)
    A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...
    Knowledge management, Digital library, Multilingualism, Language Resources, Terminology
    ... “memorization”, “scholarship”, “study”, “transfer”, “transfer of training”, “work” and from the RudOnto: “analysis”, “application”, “comprehension”, “evaluation”, “knowledge”, “synthesis”. Language equivalents (translations) are listed for another language as well; in our example, for the list for Serbian ...
    ... Resources and Tools to Improve the Performance of Web Search Engines, in Proceedings of the 6th International Conference on Language Resources and Evaluation, LREC 2008, N. Calzolari et al., Marrakech, Morocco. Lesk, M. (2005) Understanding digital libraries. Elsevier, San Francisco. Linzalone, R ...
    ... Enhanced Search of Multilingual Digital Libraries of E-journals, in Proceedings of the 8th International Conference on Language Resources and Evaluation, LREC 2012, May 2012, Istanbul, Turkey, eds. N. Calzolari et al., European Language Resources Association Istanbul, Turkey, 2012, pp. ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... feldspar, mullite, melilite, cristobalite, haematite and calcite. The fly ash and slag chemical properties are the most important indicators in the evaluation of their suitability as a building material. The ash and slag chemical composition is composed of the following chemi- cal components: SiO2, Al2O3 ...
    ... reducing the use of natural resources inroad building projects. The chemical properties of fly ash and slag are the most important indicator in the evaluation of their suitability as a building material. Know- ledge of the material mineralogical composition is significant be- cause the type of minerals ...

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... objects, coordinates, properties, evaluation, as well as the register of abandoned mines by municipalities, with the most important supporting information, the possibility of linking with the previous report, the report on abandoned mines, with evaluations and evaluation criteria. Report on ranked abandoned ...

  • Improvement of geodatabase queries within GeolISS

    Ranka Stanković (2008)
    ... morphological expansion of the query, the latter being very important in highly inflective languages, such as Serbian, which is outlined in section 4. Evaluation of query improvement is described in section 5. Key words: GIS, digital archiving of geologic data, query expansion 1. GIS approach ...
    ... Obradović, I. (2006). “WS4LR: A Workstation for Lexical Resources”. In Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2006, Genoa, Italy, May 2006, pp. 1692–1697 [10] Krstev, C., Vitas D., Stanković R., Obradović I., Pavlović-Lažetić G. (2004) “Combining ...

  • Parameter determination of soil oscillation law using quotient of the relative growth increments of oscillation velocity and reduced distances at “Nepričava“ open pit mine

    Suzana Lutovac, Sanja Bajić, Marina Ravilić, Radmila Gaćina (2015)
    ... also taken into account the curveline dependency index ρ (Vukadinović, 1970) between the reduced distance R and the oscillation velocity v. The evaluation of the relationship degree of two variables (Lutovac, 2010) to values of the curveline dependency index ρ is given in the following survey: - 0 ...
    ... one after another ε1, ε2, ..., εN, then it is: 2 2 2 1 2 ... NS N       (12) According to this criterion, for the evaluation of convenience of the obtained functional correlation, the following relations are valid: - if it is max 3S  , the obtained functional correlation ...

  • Project REASONING: Characterization and technological procedures for recycling and reusing of the rudnik mine flotation tailings

    Vesna Cvetkov, Vladimir Simić, Stefan Petrović, Filip Arnaut, Milena Kostović, Dragan Radulović, Jovica Stojanović, Vladimir Jovanović, Dejan Todorović, Nina Nikolić, Jelena Senćanski, Grozdanka Bogdanović, Dragana Marilović (2024)