Претрага
202 items
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Multi - Attribute Technological Modeling of Coal Deposits Based on the Fuzzy TOPSIS and C - mean Clustering Algorithms
Gligorić Miloš, Gligorić Zoran, Beljić Čedomir, Torbica Slavko, Štrbac-Savić Svetlana, Nedeljković Jasmina (2016)Gligorić Miloš, Gligorić Zoran, Beljić Čedomir, Torbica Slavko, Štrbac-Savić Svetlana, Nedeljković Jasmina. "Multi - Attribute Technological Modeling of Coal Deposits Based on the Fuzzy TOPSIS and C - mean Clustering Algorithms" in Energies 9 no. 12, Basel:MDPI AG, Basel, Switzerland (2016). https://doi.org/10.3390/en9121059
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Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty
... remainder of the paper is constructed as follows. Section 2 describes basics of interval numbers such as arithmetic operations, maximum and minimum between two interval numbers, ranking of interval numbers and converting interval values into a crisp values. Input parameters which are referred on ...
... 𝑁 is a set of 𝑁 interval numbers. The mean interval value of �̂� is defined as: 𝐸(�̂�) = [1𝑁 ∑ 𝑠𝑖𝑙𝑁 𝑖=1 , 1𝑁 ∑ 𝑠𝑖𝑢𝑁 𝑖=1 ] (1) 9. Maximum and minimum between two interval numbers To determine maximum and minimum between two or more interval numbers, we used the Moore Distance ...
... vague and imprecise data is the basic indicator of uncertainty. In order to overcome these problems it is necessary to apply interval numbers. Interval numbers provide a possibility that the obtained results can be found in some defined boundaries. On that way, measurement errors are reduced to ...Miloš Gligorić, Jelena Majstorović, Suzana Lutovac. "Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty" in Underground Mining Engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2018). https://doi.org/10.5937/PodRad1832001G
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Application of fuzzy inference models on the example of zinc ore flotation concentration
Miljanović Igor, Vujić Slobodan, Lazić Predrag, Jovanović Ivana, Josipović Pejović Milena, Petrovski Aleksandar (2013)Miljanović Igor, Vujić Slobodan, Lazić Predrag, Jovanović Ivana, Josipović Pejović Milena, Petrovski Aleksandar. "Application of fuzzy inference models on the example of zinc ore flotation concentration" in Proceedings of the XI Balkan Conference on Operations Research BALCOR, 7-11.09.2013. - no. -, Beograd, Zlatibor, Srbija:University of Belgrade, Faculty of Organizational Sciences, Belgrade (2013): 532-537
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Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection
metode podzemne eksploatacije, znanje eksperta, višekriterijumsko odlučivanje, podzemna eksploatacijaSanja Bajić, Dragoljub Bajić, Branko Gluščević, Vesna Ristić Vakanjac. "Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection" in Symmetry (MDPI) (2020). https://doi.org/10.3390/sym12020192
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Development of a fuzzy model for predicting the penetration rate of tricone rotary blasthole drilling in open pit mines
Kričak Lazar, Negovanović Milanka, Mitrović Stojan, Miljanović Igor, Nurić Samir, Nurić Adila (2015)Kričak Lazar, Negovanović Milanka, Mitrović Stojan, Miljanović Igor, Nurić Samir, Nurić Adila. "Development of a fuzzy model for predicting the penetration rate of tricone rotary blasthole drilling in open pit mines" in The Journal of the Southern African Institute of Mining and Metallurgy 115 no. 11, Johannesburg, The South African Republic:The Southern African Institute of Mining and Metallurgy (2015): 1065-1071. https://doi.org/10.17159/2411-9717/2015/v115n1
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Utvrđivanje eksplotacionih učinaka sistema na otkrivci na površinskom kopu Tamnava-Zapadno polje primenom Fuzzy Topsis metode
Planiranoj proizvodnji uglja na površinskim kopovima prethodi nesmetano i kontinuirano otkopavanje otkrivke. Kako bi se obezbedila potrebna količina uglja, sistemi na otkrivci moraju uvek biti korak ispred u dinamici razvoja kopa. Velika produktivnost, visoki kapaciteti i dobar koeficijent vremenskog iskorišćenja, treba da budu odlika rada sistema putem kojih se vrši otkopavanje otkrivke. Kroz ovaj rad izvršena je analiza eksploatacionih učinaka za posmatrani period po smenama, kako bi se utvrdilo koja je od pomenutih smena ostvarila najbolje rezultate.Marko Lazić, Filip Miletić, Lazar Žujović. "Utvrđivanje eksplotacionih učinaka sistema na otkrivci na površinskom kopu Tamnava-Zapadno polje primenom Fuzzy Topsis metode" in XV međunarodna konferencija Ugalj 2022, Jugoslovenski komitet za površinsku eksploataciju (2022)
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Powers of Salem Numbers and Distribution Modulo 1
Stankov Dragan (2015)Stankov Dragan. "Powers of Salem Numbers and Distribution Modulo 1" in 29th Journées Arithmétiques, Debrecen:Debrecen Egyetem (2015): 83-83
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Развој алгоритма процене ефеката ризика рада рударских машина на бази фази алгебре
Dejan V. Petrović (2014-12-30)Појава изненадних отказа елемената техничких система у рударству је свакодневна појава...Dejan V. Petrović. "Развој алгоритма процене ефеката ризика рада рударских машина на бази фази алгебре" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2014-12-30)
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Environmental Energy Security Indicators as Tools for Environmental Protection
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... analysis DATA CLASSIFICATION FUZZIFICATION FUZZY ENGINE IDENTIFICATION ENVIRONMENTAL ACCEPTABILITY Input data Input Fuzzy set Output Fuzzy set Linguistic Variables Proposition of fuzzy set Integral analisis Fuzzy composition Questioners; Monitoring; Statistical ...
... model. In this way, ranking data is used as input to the fuzzy set, which is further analyzed in the fuzzy composition process. As a result of the fuzzy composition, an environmental energy security assessment is generated in a fuzzy form. 6 Data Collection GHG emission Indirect Pollutant ...
... economic, environmental, etc. An analysis of Energy Security has been done with mathematical model which bases are the theory of the fuzzy logic and the fuzzy conclusion considering energy, economic, ecological and social indicators. If the goal of the model is to decide on a scenario assessment ...Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević. "Environmental Energy Security Indicators as Tools for Environmental Protection" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
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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 polynomialsDragan Stankov. "A necessary and sufficient condition for an algebraic integer to be a Salem number" in Journal de theorie des nombres de Bordeaux (2019). https://doi.org/10.5802/jtnb.1076
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Different aspects of soft computing methods application for blasting in mining
Mining is a global industry that is of great importance for every product which is used by human. For mining, process efficiency, reducing production downtime, increasing profitability are all very important. Soft computing tehnologies (SC) are helping in the process of transforming the mining industry into a safer and more environmental friendly industry, but keeping in mind the financial aspect as well. In this paper some of fields of blasting activities in which the SC methods have been applicated, ...Katarina Urošević, Jelena Zakonović, Radmila Gaćina. "Different aspects of soft computing methods application for blasting in mining" in Underground mining engineering , Belgrade : University of Belgrade - Faculty of Mining and Geology (2019). https://doi.org/10.5937/podrad1935065U
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Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications
Darko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic (2024)This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...примарне сировине, минералогија, физичко-механичка својства, технолошка својства, наука о материјалимаDarko Bozovic, Vladimir Simic, Dragan Radulovic, Slobodan Radusinovic, Vesna Matovic, Anja Terzic. "Geochemical evaluation of dolostone deposits in Montenegro: Implications for potential industrial applications" in Science of Sintering, Bor, August 2024, National Library of Serbia (2024). https://doi.org/10.2298/SOS240701029B
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The external aggregation Newton's method for solving nonlinear equations and applications
Marija Paunović, Dejan Ćebić, Nebojša Ralević. "The external aggregation Newton's method for solving nonlinear equations and applications" in The University Thought - Publication in Natural Sciences, Centre for Evaluation in Education and Science (CEON/CEES) (2020). https://doi.org/10.5937/univtho10-24982
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The Newton method for solving nonlinear equations based on aggregation operators
Nebojša M. Ralević, Dejan Ćebić (2019)Nebojša M. Ralević, Dejan Ćebić. "The Newton method for solving nonlinear equations based on aggregation operators" in XLVI International Symposium on Operational Research SYM-OP-IS, Kladovo, 15-18.9.2019, Универзитет у Београду (2019)
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Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept
Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov. " Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept" in Engineering Geology , Elsevier (2019). https://doi.org/10.1016/j.enggeo.2019.05.007
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On the distribution modulo 1 of the sum of powers of a Salem number
Dragan Stankov (2016)It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "On the distribution modulo 1 of the sum of powers of a Salem number" in Comptes rendus Mathematique (2016). https://doi.org/10.1016/j.crma.2016.03.012
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Concepts for Improving Machine Learning Based Landslide Assessment
Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić. "Concepts for Improving Machine Learning Based Landslide Assessment" in Natural Hazards GIS-based Spatial Modeling Using Data Mining Techniques, Advances in Natural and Technological Hazards Research, volume 48, Springer Nature Switzerland AG 2019 (2019). https://doi.org/10.1007/978-3-319-73383-8_2
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The number of unimodular roots of some reciprocal polynomials
Dragan Stankov (2020)We introduce a sequence P2n of monic reciprocal polynomials with integer coefficients having the central coefficients fixed. We prove that the ratio between number of nonunimodular roots of P2n and its degree d has a limit when d tends to infinity. We present an algorithm for calculation the limit and a numerical method for its approximation. If P2n is the sum of a fixed number of monomials we determine the central coefficients such that the ratio has the minimal limit. ...Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "The number of unimodular roots of some reciprocal polynomials" in Cmptes rendus mathematique (2020). https://doi.org/10.5802/crmath.28
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Оптимальное динамическое управление сроком эксплуатации горных машин. ч. ii. модели с ограниченным интервалом
Вуйич Слободан, Miljanović Igor, Максимович Светомир, Milutinović Aleksandar. "Оптимальное динамическое управление сроком эксплуатации горных машин. ч. ii. модели с ограниченным интервалом" in Физико-технические проблемы разработки полезных ископаемых 2010 no. 5, -:Институт горного дела Сибирского отделения Российской Академии Наук, Новосибирск Россия (2010): 66-74. https://doi.org/-
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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... ten different flotation process models based on the following soft computing methods: fuzzy logic (Mamdani and Takagi-Sugeno fuzzy inference system), artificial neural networks and hybrid adaptive neuro-fuzzy inference system. Copper content in the feed, pulp pH value and collector dosage in the ...
... through the application of artificial neural networks then by using of fuzzy logic or hybrid adaptive neuro-fuzzy inference system. Furthermore, comparison between characteristics of models based on Mamdani and Takagi-Sugeno fuzzy inference systems was performed. The Takagi-Sugeno system was proven ...
... kada su u pitanju klasični skupovi, nisu zadovoljeni kada se radi o fuzzy skupovima. Konkretno, unija fuzzy skupa A i njegovog komplementa (tj. A ∪ A') nije jednaka domenu nego njegovom podskupu (tj. ⊂ X). Dalje, presek fuzzy skupa A i njegovog komplementa (tj. A ∩ A') nije prazan skup i može sadržati ...Ivana M. Jovanović. "Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-01-13)