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Упит dcterms_subject_txt:method of least squares

2837 items

  • Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude

    Ivana M. Jovanović (2016-01-13)
    U oblasti procesa prerade rude, flotacijska koncentracija predstavlja jednu od najznačajnijih i najčešće primenjivanih metoda separacije korisnih od nekorisnih minerala. Samim tim, veoma je važno osigurati uspešan rad flotacijskog postrojenja kroz dostizanje zadovoljavajućih tehno-ekonomskih pokazatelja. Cilj upravljanja procesom flotacijske koncentracije je upravo optimizacija kvaliteta i iskorišćenja korisne komponente u koncentratu uz maksimizaciju profita. Shodno tome, istraživanja na polju modelovanja i upravljanja ovim procesom zauzimaju značajno mesto u praksi kontolnog inženjenringa.Teorijska istraživanja u okviru doktorske disertacije obuhvatila su analizu položaja ...
    flotacijska koncentracija, modelovanje, upravljanje, inteligentni sistem, soft kompjuting, fazi logika, veštačke neuronske mreže
    ... Liang, C., 2015. Estimation of copper concentrate grade based on color features and least-squares support vector regression. Physicochemical Problems of Mineral Processing 51(1) pp. 163−172 236. Ritika, 2014. Research on Data Mining Classification. International Journal of Advanced Research in Computer ...
    ... diskriminantna analiza (engl. Linear Discriminant Analysis) LS-SVM – metoda potpornih vektora koja koristi tehniku najmanjih kvadrata (engl. Least Squares Support Vector Machines) LVQ – Kvantizacija vektora učenja (engl. Learning Vector Quantization) MARS – multivarijantni adaptivni regresioni ...
    ... ih iz slika pene (boja pene, veličina mehurića, mineralizacija 15 Engl. LS-SVR - Least squares support vector regression. I. Jovanović, MODEL INTELIGENTNOG SISTEMA ADAPTIVNOG UPRAVLJANJA PROCESOM PRERADE RUDE UNIVERZITET U BEOGRADU ...

  • Production of morphological dictionaries of multi-word units using a multipurpose tool

    Ranka Stanković, Ivan Obradović, Cvetana Krstev, Duško Vitas (2011)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multi-word units, noun phrases, query expansion
    ... case, and these two components agree in gender and animacy, then the additional conditions are checked, and at least one of them needs to be satisfied. In this case it means that one of the following additional conditions must be satisfied: the first component starts with uppercase letter (e.g. Ajfelova ...
    ... functionality of LeXimir, and makes use of our comprehensive e- dictionaries of Serbian simple words. We present an evaluation of the performance of this functionality, and hence of our procedure, obtained from experiments on two types of data. Finally, we discuss some further possible applications of our procedure ...
    ... PROCEDURE FOR INFLECTION OF MWUS A. Detection of inflectional properties of MWU lemmas We have further improved the procedure for production of MWU lemmas when we realized that the answers obtained automatically in support of manual production of MWU lemmas can also help in detection of the syntactic c ...

  • Open Educational Resources in Serbia

    Ivan Obradović, Ranka Stanković, Marija Blagojević, Danijela Milošević (2020)
    Open educational resources, BAEKTEL, Metadata portal
    ... instruments for the development of digital education content, open educational resources and software solutions”. However, such a Center has so far not been established. While this Law that regulates lower levels of education at least recognizes OERs, there is no mention of them in the Law on Higher Education ...
    ... by a group of individuals comprised of scientific researchers, architects, curators, journalists and artists, as well as several institutions, such as the Section of librarians of the Association of Institutes of Serbia, Section of museum librarians of the Association of Museums of Serbia, Youth ...
    ... gallery in Novi Sad), University of Belgrade (Faculty of Mathematics, Faculty of Chemistry, Faculty of Physics, Faculty of Philosophy, University Library "Svetozar Marković" - Department of Scientific Information, University Computer Center), University of Niš (Faculty of Natural Sciences and Mathematics ...

  • Towards Automatic Definition Extraction for Serbian

    Ranka Stanković, Cvetana Krstev, Rada Stijović, Mirjana Gočanin, Mihailo Škorić (2021)
    U radu su prikazani preliminarni rezultati automatske ekstrakcije kandidata za definicije rečnika iz nestrukturiranih tekstova na srpskom jeziku u cilju ubrzanja razvoja rečnika. Definicije u rečniku Srpske akademije nauka i umetnosti (SANU) korišćene su za modelovanje različitih tipova definicija (opisnih, gramatičkih, referentnih i sinonimskih) koje imaju različite sintaksičke i leksičke karakteristike. Korpus istraživanja sastoji se od 61.213 definicija imenica, koje su analizirane korišćenjem morfoloških e-rečnika i lokalnih gramatika implementiranih kao pretvarači konačnih stanja u paketu za obradu korpusa otvorenog ...
    ... begin with a word from the WordNet and at least one more word belonging to the same chain of hypernym/hyponym relations. The system passes information about the preferred position of the term for which a definition is sought: whether it must be at the beginning of the sentence, after predefined initial ...
    ... word embeddings via multiple layers of neural networks (Veyseh et al., 2020). Barnbrook (2002) claimed that definition is a basic activity of language, of particular importance to linguists because of its use of language to describe itself. He described the subset of general language used in definition ...
    ... discusses the problem of dictionary definition modelling and methods for automatic extraction of candidates for dictionary definitions. The third section provides an analysis of lexical and syntactic characteristics of dictionary definitions in Serbian based on the corpus of definitions of nouns from the ...

  • Softverski alati za korišćenje resursa za srpski jezik

    Ivan Obradović, Ranka Stanković (2008)
    ... is the alignment of segmented parallel texts by means of one of the available alignment methods. The goal is to connect equivalent seg- ments in two or more parallel texts. The method usually used for alignment at the sentence level, which is the most common one, is the method developed by (Gale ...
    ... have already mentioned. Figure 13 depicts a HTML document in WS4QE with selected segments where one of the forms from the expanded query for the key- word ‘igra’ (game) is found in at least on of the languages. The forms identified are marked by underlining and “highlighting”, namely by repre- senting ...
    ... s in LADL format, none of them of- fered possibilities for management of the content of the dictionaries themselves. Thus a module was developed within WS4LR for the entry, re- view and update of lemmas of simple words and compounds, which supports the specific features of all three solutions (Intex ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... Pilot Plant (with gas yield of at least PRG = 1.9Žmž /kg for lignite, 7J =65%) Will generate the following amount of syngas: Q.=0, 1 gasif 3 · PRG ·neait = 23400 -10* kg ·1.9“%)·0.65 = 28889·10% mš g O, =29-10%X) (9) The available energy potential from this amount of UCG generated gas, taking ...
    ... significant economic effects of the UCG application are. In parallel, environmental benefits are also exceptional. Utilization of UCG method does not generate any slag and ash, there is no degradation of the terrain comparing to the un- derground exploitation of coal, and also no special needs ...
    ... account the useful volume of coal. In addition, it should be kept in mind that the UCG method mainly utilizes non-balanced deposits and excavated residues of balanced reserves. * Corresponding author, e-mail: stamenic(a)msn.com Petrović, D. T., et al.: Valorization of Non-Balanced Coal Reserves ...

  • Using Lexical Resources for Irony and Sarcasm Classification

    Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković (2017)
    The paper presents a language dependent model for classification of statements into ironic and non-ironic. The model uses various language resources: morphological dictionaries, sentiment lexicon, lexicon of markers and a WordNet based ontology. This approach uses various features: antonymous pairs obtained using the reasoning rules over the Serbian WordNet ontology (R), antonymous pairs in which one member has positive sentiment polarity (PPR), polarity of positive sentiment words (PSP), ordered sequence of sentiment tags (OSA), Part-of-Speech tags of words (POS) ...
    ... shows that 11% of comments from the set in question would be incorrectly marked as having positive polarity, if analysis and detection of the rhetorical figure irony had not been performed. In this paper, we suggest and assess an automatic method of detection of verbal irony using rules of ontological ...
    ... that was obtained based on the recognition threshold of 40%, which means that each tweet from that set was classified positively if at least 40% of words in it were marked with a tag _word. The reason for accepting this threshold is a high degree of true positives 6See for example Alexander. R., Elias-Bursać ...
    ... achieved using the LR method with a combination of all sug- gested predictors. Pattern-based methods of irony detection utilize patterns either independent of or specific to a particular natural language that is being investigated. For example, authors in [31] used a corpus of tweets in Portuguese and ...

  • Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)

    Ljiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • 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 ...
    ... (+Top), and thus all three are assigned to the lemma Dunav ‘Danube’. Some lemmas are related by some sort of “inverse” relation, which indi- cates that if one lemma has a certain feature, then at least one other lemma exists with an “inverse” feature. These relations are sometimes explicitly encoded by ...
    ... dictionary. The main class of the core of the lexicon model is the class LexicalEntry, representing a unit of analysis of the lexicon, which encompasses a set of inflected forms that are grammatically related, and a set of base meanings that are associated with all of these forms (Figure 2). A lexical ...
    ... designed and implemented for the purpose of further development and management of morphological electronic dictionaries of Serbian (SMD), presented in more details in Section 3.. However, with the growing number of dictionary developers, and given the va- riety of dictionaries and information stored in ...

  • An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction

    Dejan Ćebić, Nebojša Ralević, Marina Marčeta (2020)
    нелинеарна једначина, 16.ред конвергенције, оптималне методе, подељене разлике

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... conditions of the Creative Commons Minerals 2021, 11, 813. https:/ /doi.org/10.3390/min11080813 https: / /www.mdpi.com/journal/minerals Minerals 2021, 11, 813 2 of 19 (individual or multiple) rock mass. Goodman [3] emphasized in his book that rock mate- rials that consist of at least two lithological ...
    ... 2021, 11, 813 16 of 19 Figure 16. Comparison of the intact rock material UCS σci TX. Marinos and Hoek [9] proposed a practical method for determining the intact strength properties of a heterogeneous rock mass. The authors suggested that it is not appropriate to use properties of stronger rock material ...
    ... Figures 16 and 17. Figure 17. Comparison of the value material constant mi. Marinos [10] expanded and modified the original practical method for determining the intact strength properties of a heterogeneous rock mass. In this method, too, the strength properties of a heterogeneous rock mass σci and mi are ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... for selection of good dictionary examples for Serbian and the development of initial model components. The method used is based on a thorough analysis of various lexical and syntactic features in a corpus compiled of examples from the five digitized volumes of the Serbian Academy of Sciences and Arts ...
    ... we present research aimed at the development of a GDEX method for Serbian that ranks corpus sentences and suggests the most appropriate ones. As the gold standard for the development of our method, dictionary examples from five out of twenty volumes of the SASA dictionary (Stijović & Stanković, 2017) ...
    ... ion, not for ranking (see Section 4). The analysis showed that a group of features can be used as filter features, namely, as strong indicators that a sentence should not be used as an example. Sentences that have at least one non-zero value for any feature belonging to this group are categorised ...

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • FrameNet Lexical Database: Presenting a Few Frames Within the Risk Domain

    Aleksandra Marković, Ranka Stanković, Natalija Tomić, Olivera Kitanović (2021)
    U radu se daje kratak prikaz teorije semantike okvira, na kojoj je zasnovana leksička baza Frejmnet. Predstavljena je koncepcija ove mreže, kao i mogućnosti njene primene. Predstavljena je i leksička analiza koja se primenjuje u projektu izrade Frejmneta i ukazano na razlike između analize zasnovane na okviru u odnosu na analizu zasnovanu na reči. Zatim je prikazano nekoliko povezanih okvira koje prizivaju reči iz domena rizika. U radu je predstavljena i platforma NLTК pomoću koje se mogu koristiti ...
    Srpski jezik, semantika okvira, FrameNet, scenario rizika, rudarski korpus, obrada prirodnog jezika
    ... theory was used to analyze the context (90). In view of the findings of these two distributional analyses, the authors concluded that there was no significant difference in the mean- ing of odredba in the corpora under examination and that the method of double clustering can be used in complex semantic ...
    ... possible, there need to be at least two perspectives for viewing a neutral frame. For instance, the frame Risk_scenario is a neutral frame, while the frames Risky_situation, Being_at_risk and Run_risk are all perspectivized; the situation is viewed from the per- spective of one of the participants. The frames ...
    ... labeled in sta- ble semantic-syntactic models (96–97), but the question of whether this is a valid method remains because semantic roles and frames are formed around a LU, a (verb) lexeme in one of its senses. The paper Brač and Anić (2019) showcases a project aimed at developing a methodology for ...

  • 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

  • An Approach to Efficient Processing of Multi-Word Units

    Cvetana Krstev, Ivan Obradović, Ranka Stanković, Duško Vitas (2013)
    Efficient processing of Multi-Word Units in the course of development of morphological MWU dictionaries is not easy to achieve, especially when languages with complex morphological structures are concerned, such as Serbian. Manual development of this type of dictionaries is a tedious and extremely slow process. To alleviate this problem we turned to our multipurpose software tool, dubbed LeXimir, in the production of lemmas for e-dictionaries of multi-word units. In addition to that, we developed a procedure aimed at making ...
    Natural Language Processing, Grammatical Category, Lexical Representation, MWU, multi-word unit
    ... well, and these two com- ponents agree in gender and animacy, then the additional conditions are checked, and at least one of them needs to be satisfied. In this case it means that one of the following additional conditions must be satisfied: the first component starts with up- percase letter (e.g ...
    ... functionality of LeXimir. In this paper we present our approach, and offer an eval- uation of the performance of the new functionality of LeXimir, and hence of our procedure, obtained through two rounds of experiments on various types of data. The paper ends with a brief discussion of some further ...
    ... Procedure for Inflection of MWUs 4.1 Detection of inflectional properties of MWU lemmas We have further improved the procedure for production of MWU lemmas when we realized that the answers obtained automatically in support of manual production of MWU lemmas can also help in detection of the syntactic composition ...

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... powerful technique for the analysis of bipyridine metal complexes,27 and therefore it is used here as a method of first choice. Tested metal complexes affect the enzymatic aLaboratory of Physical Chemistry, Institute of Nuclear Sciences ‘‘Vinča’’, University of Belgrade, Mike Petrovića Alasa 12-14 ...
    ... a suitable method for sensitive detection of the PLA2 activity.31 We selected this approach for monitoring concen- tration changes of LPLs, as products of the PC digestion with PLA2 with and without metal complexes. Along with high sensitivity and possibility to acquire high number of information ...
    ... other types of secreted phospholipase A2 are inhibited in the same way with a nonapeptide or lysophosphatidylcholines.40 We have selected MALDI-TOF MS for the study of the PLA2 activity because this method is sufficiently sensitive and does not require any additional derivatization of the samples ...

  • Geochemical characterization of sediments from the archaeological site Vinča – Belo Brdo, Serbia

    Gorica Veselinović, Dragana Životić, Kristina Penezić, Milica Kašanin-Grubin, Nevenka Mijatović, Jovana Malbašić, Aleksandra Šajnović (2020)
    Earth-Surface Processes

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... recovery rate was determined by spiking the sample with standard solutions of phosphate that were added to 0.2 g of AC2. The average of three recovery values was 97.1%. The linearity of the method was assessed using ordinary least-square regression. X-ray diffraction. The X-ray powder diffraction in ...
    ... components on the spectroscopic properties of biochars. XPS is a powerful method for identifying functional groups and the degree of carbonization at the surface of biochar particles, but yields only semi-quantitative results regarding the large error of the method. It is also not clear what is the relevant ...
    ... temperature. The results of Raman spec- troscopy did not well correlate with the amount of sp? hybridized carbon determined by XPS. A better correlation of XPS data was found with the electrical polarization determined by the method of spectral induced polarization that was used for the first time ...