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Упит dcterms_creator_txt:Rosić A. Aleksandra

1596 items

  • Asbestos-Based Pottery from Corsica: The First Fiber-Reinforced Ceramic Matrix Composite

    Philippe Colomban, Aleksandar Kremenović (2020)
    Asbestos-containing pottery shards collected in the northeast of Corsica (Cap Corse) and dating from the 19th century, or earlier, have been analyzed by SEM-EDS, XRPD, FTIR and Raman microspectroscopy. Blue (crocidolite) and white (chrysotile) asbestos fiber bundles are observed in cross-sections. Most of the asbestos is partly or totally dehydroxylated, and some transformation to forsterite is observed to occur, indicative of a firing above 800 C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with ...
    asbestos, CMC, Corsica, fiber, pottery
    ... of a firing; above 800 "C. Examination of freshly fractured pieces shows a nonbrittle fracture with fiber pull-out, consistent with a composite material behavior, which makes these ceramics the oldest fiber-reinforced ceramic matrix composite. Residues indicate the use of this pottery as a crucible ...
    ... fracture of a ceramic gives rise to a brittle edge, and fracture initiation depends upon the defects and their distribution in the matrix. It is thus difficult to design the shape and mechanical strength of a ceramic object. However, the association of two brittle materials, i.e., a composite material ...
    ... Coarse grains (up to 5 mm) are mixed in a rather homogeneous matrix of a high open porosity (~30%). Table 1. Oxide composition measured by SEM-EDS on spots indicated in Figure 1 for samples a to c. Characteristic values in bold. Sample b Sample c Sample a Sample d Oxide «0» «» «3» «60» «l» «6» ...

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... Viyy=25 > 1074 © = 1-1024, R=2.30, Vi,=50 = © = 1-1024, R=2.30, V,,—50 a A 12046, R=2.25, Vj,=102 a A 12046, R=2.25, Vy.=102 om ¥ L=4087, R=2.22, Vy,=208 = 1074 V L-4087, R=2.22, Vy,=208 ~ ~ a¥ ~ an e a <a ™ wa ~a04 a , e Q Ag A ? @ 7 e | > » ee NS YY g 3 3 = va to! 102108 . va . sr . S -8 ini T 10 ...
    ... 30, Vy,=50 a vy ine © £=1024, R=2.30, Vy.=50 a vn 4 1=2046, R=2.25, V,,=102 i904 vy 4 1=2046, R=2.25, V,,=102 = 10°4 L=4087, R=2.22, V.=208 = L=4087, R=2.22, V.=208 ~ ~ a # 1024 S 1074 & _ & FS 10% ~s = a = = gf 7s ae a 1 : 7 1044 x yoo 4 = 1044 3 ae = e t 5] 210°) = = S10! % wa <a S 10° = a ~ 10! 102108104 ...
    ... © 1=1024, R=2.30, Vy,—50 a @ 11024, R=2.30, Vy,=50 & 4 L=2046, R=2.25, Vy—102 & vee A L=2046, R=2.25, Vy,—102 Sao = vw ws 10°4 Vy L=4087, R=2.22, Vy, =208 3 ~ VY L=4087, R=2.22, Vy, =208 ~ = 1074 E “n” — eK a = ~z10"4 Aa gs ~~ = | we = 10° zg 1044 108 a Y eve % a 7 Ss = 194 A Sot = = % 7 z % & -6 | z ...

  • Softverski alati za korišćenje resursa za srpski jezik

    Ivan Obradović, Ranka Stanković (2008)
    ... of a transformation of resources such as dictionar- ies, graphs and regular expressions from a format SOFTWARE TOOLS FOR SERBIAN LEXICAL RESOURCES 52a used by Intex to a format used by NooJ. Figure 9 depicts a panel for conversion of a morphologi- cal dictionary into Unicode using a C# procedure ...
    ... words “lice” and “lik” are used in Serbian. Thus a semantic network of concepts in a particular language becomes a cor- responding semantic network of words, which is further materialized as a lexical data base of a specific structure. Development of wordnets started in 1985 in the research team ...
    ... whether it is a simple word or a compound, using SMD, and connects them by logical “or” relations. In the same way, by a simple choice of appropriate fields, the user selects whether he/ she wants to make a query in Cyrillic or Latin alphabet, or in both. WS4QE obtains semantic expansion of a query by ...

  • WS4LR - a Worksation for Lexical Resources

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Ivan Obradović (2006)
    Lexical Resources, Wordnet, Serbian
    ... describes the syntactic, semantic, derivational, or other properties of a lemma. A part of speech code and an inflectional class code uniquely determine the finite transducer that generates all the forms in a lemma paradigm. A finite transducer, being capable of producing the output, adds to all ...
    ... these dictionaries are given in Appendix A. 2.2 Wordnets Roughly speaking, a wordnet, such as the Princeton WordNet (PWN) is composed of synsets, or sets of synonymous words representing a concept, with basic semantic relations between them forming a semantic network (Fellbaum, 1998). Each synset ...
    ... and runs on a personal computer under Windows 2000/XP/2003 operating system with at least 256MB of internal memory. 1 Introduction The Human Language Technology group at the Faculty of Mathematics has been developing various lexical resources over quite a long period, reaching a considerable ...

  • 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
    ... ‘statistical yearbook of the republican institute’ where A stands for an adjective, N for a noun and PREP for a preposition. Each of these components can be a single word or a MWU. Our system was used in a mode in which all possible MWTs in a word sequence are recognised, and not only the longest one ...
    ... 119–138 ekrana (namely, a photo of a current state of the screen) or as a “skrinšot” (i.e, the word is transcribed). It is not uncommon that even experts from a certain field have difficulties while translating texts that contain domain terminology. As in the example with a “debugger”, the transcribed ...
    ... on the existence of a bilingual dictio- nary with no parallel texts and the second one requiring only the existence of a small amount of parallel data. In order to compile a bilingual lexicon for a specific domain, we combined and compared several settings. Besides using only a parallel sentence-aligned ...

  • Part of Speech Tagging for Serbian language using Natural Language Toolkit

    Ranka Stanković, Boro Milovanović (2020)
    Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...
    obrada prirodnog jezika, mašinsko učenje, neuronske mreže
    ... March 2020. Having a plethora of different algorithms makes this library a good choice for a research. Serbian language belongs to a group of low-resource languages so there’s a modest research on this topic. First attempts to create an automatic PoS tagger for Serbian relied on a dictionary. Delić ...
    ... all-around PoS tagger that can be a standard for a Serbian language. Best performance in this research is achieved with the Perceptron tagger, a neural network which is more than a decade old. Since then, a breakthrough with deep learning has happened, so there’s a strong belief that further improvements ...
    ... PoS (Part of Speech) tagging, a process of assigning a part of speech category to each token in the text. The program that performs tagging is called tagger. The taggers can be created in multiple ways. In this paper, we will create a tagger for Serbian with a help of a Python library NLTK (Natural ...

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • 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 ...

  • VENTEX: An Expert System for Mine Ventilation Systems Analysis

    Ranka Stanković, Nikola Lilić, Ivan Obradović (1996)
    Analiza sistema za ventilaciju je komleksan proces, koji bazira na proračunu brojnih parametara, koji se odnose na: stanje mreže, provetrenost, stabilnost sistema, gubitke vazduha, klimatske uslove, gasno stanje, ugroženost od požara i opasne prašine. Navedeni problemi se uspešno rešavaju paketom SimVent, ali potpuno razumevanje i korišćenje dobijenih rezultata zahteva angažovanje iskusnog specijaliste iz oblasti ventilacije. Rešenje je nađeno u kreiranju ekspertnog sistema VENTEX, čija je baza znanja formalizacija ekspertskog znanja iz oblasti ventilacije rudnika. U radu je prikazana metodologija ...
    ekspertni sistem, ventilacija
    ... input, - by activating a procedure attached to the slot that calculates its value, - by inheriting all properties (and consequently slot values) from a slot at a higher level of hierarchy. The object-oriented approach implemented through frames system presents a suitable formalism for ...
    ... this paper first a hierarchical decomposition of the ventilation state evaluation analysis problem was proposed. As a consequence, the solution of this complex problem which is based on the estimation of a number of mutually dependent parameters is greatly facilitated. Then a possible approach ...
    ... e knowledge are needed for a successful solution of problems in mine ventilation systems analysis. This paper describes an approach to mine ventilation system analysis which is based on a symbolic upgrading of the numerical SimVent system. The result is VENTEX, a coupled expert system in ...

  • 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 ...
    ... Towards sustainable management of transboundary Hungarian — Serbian aquifer. In: Transboundary Water Resources Management: A Multidisciplinary Approach, 1 Ed. (eds. Ganoulis J., Aureli A. and Fried J.). Wiley-VCH Verlag. pp. 143-149 STEVANOVIC, Z. HAJDIN B., RISTIC VAKANJAC V., DOKMANOVIC P., MILANOVIC S ...

  • 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