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Упит dcterms_subject_txt:директно коришћење УПГ-а

1572 items

  • INVENTS: A Hybrid Mine Ventilation Planning and Design System

    Lilić Nikola, Stanković Ranka, Obradović Ivan (2013)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    hybrid systems, mine ventilation, expert systems
    ... the following blocks: 1. a block for the analysis of air flow and pressure distribution in the ventilation network, 2. a block for the analysis of climate conditions in mine chambers, 3. a block for temperature and heat depression analysis in fire incidence conditions, 4. a block for gas distribution ...
    ... ventilation planing and analysis problem using a hybrid system composed of three entities: a package for aerodynamic definition of mine ventilation networks - ResNet, a package for ventilation simulation in complex mine ventilation networks - SimVent and a diagnostic expert system for ventilation system ...
    ... architecture of a hybrid system for mine ventilation planing and analysis the software implementation of this system is described, which comprises a symbolic upgrade of the existing simulation packages SimVent and ResNet. The development of a frame-based knowledge base presents a natural approach ...

  • INVENTS: a hybrid system for subsurface ventilation analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...
    ... the following blocks: 1. a block for the analysis of air flow and pressure distribution in the ventilation network, 2. a block for the analysis of climate conditions in mine chambers, 3. a block for temperature and heat depression analysis in fire incidence conditions, 4. a block for gas distribution ...
    ... ventilation planing and analysis problem using a hybrid system composed of three entities: a package for aerodynamic definition of mine ventilation networks - ResNet, a package for ventilation simulation in complex mine ventilation networks - SimVent and a diagnostic expert system for ventilation system ...
    ... architecture of a hybrid system for mine ventilation planing and analysis the software implementation of this system is described, which comprises a symbolic upgrade of the existing simulation packages SimVent and ResNet. The development of a frame-based knowledge base presents a natural approach ...

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... mutual interoperability a critical issue. One of the means to secure this interoperability within a specific domain is the use of ontologies, containing a comprehensive common domain vocabulary. This means that all terms used within a domain need to be standardized, with a clear and unambiguous ...
    ... achieve this, it does not suffice simply to react to a problem when it occurs, but an analysis of weak points is needed, leading to a reduction of risk. A prerequisite for such an analysis is the creation of a comprehensive database with a history of injuries and conditions that led to an injury ...
    ... documents as well as actions that provide personalized training for a specified context, e.g. a given activity, workplace, operator type, work machine, etc. In order to make knowledge within RudOnto available to a wider circle of users, a client-server application was developed enabling web access to ...

  • Optimizacija vodosnabdevanja podzemnim vodama u Srbiji

    Dušan Polomčić, Zoran Stevanović, Petar Dokmanović, Vesna Ristić-Vakanjac, Bojan Hajdin, Saša Milanović, Dragoljub Bajić (2012)
    ... 3/s. Ia za a S a Sa a a a a za p a za a h . a za a a h a z a a . U z a a az a h a a a a a s sa a a sa a a h s s a a a a a a a h a a sa za a a a a a. Za az a a h, s a a a h a h a . a a h a a a a a a a . Dugan Poloméié ...
    ... aquifer (m 3 /s) a a A a a O (V a) a Ka a a P a a U Ba a Ba a 1,45 3,57 0,43 - - 5,45 S Ma , / Ta 6,97 0,34 0,50 0,03 - 7,84 a a S a 2,58 - 0,84 0,43 - 3,85 I a a 0,62 - 0,06 1,71 - 2,39 J zap a S a 0,24 - 0,14 1,61 - 1,99 Zap a S a 1,05 - 0,06 0,40 ...
    ... nim izdanima. Neke od tih aktivnosti su sinhronizovane kroz direktne bilateralne komunikacije nacionalnih institucija (ministarstva, i njihovih tela) (Durié , 2006), neki drugi su preduzeti od strane koordiniranih akcija UN (UN/ECE 2007), a neki su izaSli kao rezultat projekata koje finansira EU (Stevanovié ...

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... into Boolean expressions. When a MWU is used as a keyword, it must be entered under quotation marks in order to be treated as a whole. A general search, which looks for keyword matches in all metadata fields in the summary report is available, but the user can also perform a faceted search using additional ...
    ... several stemmers was reported: a stemmer as a part of a larger system for information retrieval, PoS tagging, shallow parsing and topic tracking [15], a stemmer and lemmatizer based on suffix stripping [11], the same basic idea being used in the stemmer presented in a later paper [17]. The only stemmer ...
    ... 10190, pp. 1–24, 2017. DOI: 10.1007/978-3-319-59268-8 8 A u t h o r P r o o f 2 R. Stanković et al. In general, if the response to a user query related to a collection of documents is performed by keyword search of these documents, then a preprocessing phase for additional representation of document ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... aaaaa a a aaaaagaaaaoi 29 7. Instance-Based Learning ... naanaaaanaaaaaaaaaaaaaagatoati 29 8. Model-Based Learning ... ana a anaaaaa a aaaaaaaaaakaaaaoi 29 5. SENSORS FOR MONITORING SUBMERSIBLE PUMPS ..........anann.. 30 5.1. Pressure sensor 5.1.1. Operating principle.....aaaaaaaa a aaaaaa ...
    ... Typical rod pump automation includes instrumentation with load cells and position sensors, a pump shut-off control device, a control panel, and a motor drive, and in some cases, a variable-speed drive. Additionally, a radio for receiving and sending information to/from SCADA (Supervisory Control and Data ...
    ... were tested for a single scale. An example of applying CWT with only one scale to a normalized dynamometric chart from a well is shown in Figure 6.6. 00 02 04 06 08 10 0 2 40 [J P 100 Figure 6.6. Application of CWT with only one scale to a normalized dynamometric chart from a well. Equations ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • 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
    ... presented as a list of documents matching the metadata query with links to full-text articles in a PDF format, as well as to a TMX aligned text in an HTML format. Figure 5 shows the result of the previous query for the selected language (English), but selection of language “sr” would retrieve a page with ...
    ... Purpose – 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 ...
    ... within a user-friendly platform, with the possibility for a very high level of search refinement. Bibliša also supports the analysis of concepts and concept structures, identifying terms assigned to concepts, and establishing relations between terms in English and Serbian, which makes it a valuable ...

  • 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)

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... a % - b 200 - ii D tl/(:· AŠ |=} 180 - 70 //E?] “ (-P-4"| AAJA N B D/_T'Jč, ___160 – A “A Ee . PrO M “ A Š Š D n f Č ĆA A -- o B 140 ; _ [- Ž . A a 50 M ~ : AAA AA n 070 - BI A AAAA %Ž mpon-- D A Z AA _ |j A 0 7 O A ŠA -& W m 1 l 100 _Z A a A |} A 30 80 ii CBRa(%) a E iii ...
    ... performed on a subgrade layer made of natural stone aggregate (gravel). The subgrade layer was constructed above the embankment layer, which consist- ed of natural material (sand) in three layers with a thickness of 0.3 m. Spreading was performed in a layer with a thickness of 0.35 m under a loose condition ...
    ... Email: milan.bogdanovic(Ottpaqi.com. This paper presents a dynamic California Bearing Ratio (CBR,) device that can be usedon a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material ...

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... in disambiguation. • X-N (6%), 2XN—a noun preceded by a word that does not inflect in the terminological phrase. Usually it is a word that is used only in one or few terminological phrases, a prefix or an adverb derived from an adjective, while the separator can be a hyphen; examples are ‘bto sistem’ ...
    ... examples, and providing a comprehensive picture of the use of terms in various dictionaries, textbooks, professional and scientific literature. A termi- nology system that includes a relational terminology database, a SPARQL endpoint with linguistic linked open data, on the one hand, and a web and mobile a ...
    ... http://vocbench.uniroma2.it (accessed on 12 February 2020). 60. Stellato, A.; Fiorelli, M.; Turbati, A.; Lorenzetti, T.; van Gemert, W.; Dechandon, D.; Laaboudi-Spoiden, C.; Gerencsér, A.; Waniart, A.; Costetchi, E.; et al. VocBench 3—A collaborative Semantic Web editor for ontologies, thesauri and lexicons ...

  • 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
    ... word senses, drawn from other lexicographic resources. The task provided prospective systems with a set of word senses that were not in PWN, where each word sense comprised a lemma, a part of speech, and a defi- nition. The systems were to identify the most plausible point for placing each of the word ...
    ... exception of a little over 1,000 Serbian specific synsets that do not exist in PWN. In our research we used 20,221 aligned synsets (from a previous version of SerWN), coupled with a number of bilingual resources, to speed up the development of SerWN, by selecting and adjusting PWN synsets from a set of ...
    ... TermII]* where TermI represents a word in one language, and TermII a corresponding word in another. A few examples from the en-sr parallel list are: grandmother;baka,baba soft drink;bezalkoholno piće safe,secure;bezbedan,siguran From the en-sr parallel list we produced a simple list of translation pairs ...

  • Frequency and Length of Syllables in Serbian

    Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)
    Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.
    frekvencije slogova, dužina slogova, srpski jezik
    ... rank-frequency distribution for word forms!® (cf. Popescu et al. 2009, pp. 137-138; the highest value of a is 1.6543 for a Hawaiian text, i.e. for a text written in a very analytical language). It can be a consequence of the fact that the inventory of syllables is, at least for Slavic languages, much more ...
    ... is perhaps the best known theoretical framework. A more detailed description can be found in Pulgram (1970). However, this approach requires a comprehensive dictionary that contains practically all words used in a language. Lehfeldt (1971) presented a modification, distinguishing between marginal (rarely ...
    ... distribution for word forms16 (cf. Popescu et al. 2009, pp. 137-138; the highest value of 𝑎 is 1.6543 for a Hawaiian text, i.e. for a text written in a very analytical language). It can be a consequence of the fact that the inventory of syllables is, at least for Slavic languages, much more restricted ...

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Bilingual lexical extraction based on word alignment for improving corpus search

    Jelena Andonovski, Branislava Šandrih, Olivera Kitanović (2019)
    Library and Information Sciences,Computer Science Applications

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid
    ... Pytlak, A., Stepniewska, Z., Kuzniar, A., Szafranek-Nakonieczna, A., Wolinska, A., Banach, A., 2014. Potential for aerobic methane oxidation in carboniferous coal measures. Geomicrobiol J. 31, 737–747. https://doi.org/10.1080/01490451.2014.889783. Pytlak, A., Sujak, A., Szafranek-Nakonieczna, A., Grzadziel ...
    ... lignite may re- duce GHG emissions from the aban- doned mines. • Detritic lignites show the potential to serve as a source of coalbed methane. G R A P H I C A L A B S T R A C T a b s t r a c ta r t i c l e i n f o Article history: Received 2 May 2021 Received in revised form 2 August 2021 Accepted ...
    ... C l o m n( n oi tc u d or p 2 ss a m yr d g 1- y a d 1- ) 0 100 200 300 400 500 a) b) Fig. 5. Greenhouse gases (GHG) production rate of CO2 (a) and CH4 (b) in the studied lignites. Mean values ± SD. Sample abbreviations as in Table 1. A. Pytlak, A. Szafranek-Nakonieczna, W. Goraj et al ...

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling semantic search of mathematical content. A specific use of the system is mathematical support in ...
    ... Bearing this in mind, development of a Mathematical Learning Environment in Serbian (MLES) has been initiated. MLES is intended as a learning environment with the main goal of processing mathematical content in Serbian. The environment built around a corpus of mathematical content and provides ...
    ... obtaining a searchable format of these materials is the conversion of source files, given specific Serbian letters. MLES provides a semantic search engine, which allows for processing of various formats of user requests, effective matching and relevance ranking, and features a user friendly ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel