Претрага
191 items
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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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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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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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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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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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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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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 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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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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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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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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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)
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Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike
Milanka N. Negovanović (2015-06-30)Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina... H-J. (ed.): Fuzzy Technologien - Prinzipien, Werkzeuge, Potentiale, VDIVerlag, Düsseldorf, 1993. 113. Ruan, D., Kerre E.E., Fuzzy implication operators and generalized fuzzy method of cases, Fuzzy Sets Syst., 54, 1993, 23-37. 114. Sugeno, M. (ed.), Industrial Applications of Fuzzy Control, No ...
... control systems: fuzzy logic controller - part2, IEEE Transactions on Systems, Man, and Cybernetics, 20(2), 1990, 419-435. 124. Bai Y., Zhuang, H., Wang, D., Fundamentals of Fuzzy Logic Control - Fuzzy Sets, Fuzzy Rules and Defuzzifications, Advanced Fuzzy Logic Technologies in Industrial Applications ...
... synthesis with a fuzzy logic controller, International Journal of Man-Machine Studies, 7(1), 1975, 1-13. 122. Lee, C.-C., Fuzzy logic in control systems: fuzzy logic controller - part1, IEEE Transactions on Systems, Man, and Cybernetics, 20(2), 1990, 404-418. 123. Lee, C.-C., Fuzzy logic in control ...Milanka N. Negovanović. "Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-06-30)
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Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike
Milanka N. Negovanović (2015-06-30)Modeliranje predviđanja potresa tla od miniranja primenom fazi logike i metode MonteKarlo zasnovano je na podacima dobijenim terenskim merenjima potresa uzrokovanihminiranjem. Promenljive modela definisane su analizom parametara bušenja i miniranjaminskih serija, kao i velosigrama izmerenih potresa od miniranja. Iskorišćene suprednosti fazi logike u implementaciji mnogo većeg broja ulaznih i izlaznih veličina zamodeliranje u odnosu na postojeće empirijske modele. Na osnovu identičnih podataka,dobijen je regresioni model predviđanja potresa, da bi se izvršilo testiranje novogmodela. U cilju povećanja pouzdanosti modela predviđanja, ...model, predviđanje potresa, miniranje, površinski kop, Monte Karlo, fazilogika, regresiona analiza, FFT analiza, spektri odziva, pomeraj pukotina... H-J. (ed.): Fuzzy Technologien - Prinzipien, Werkzeuge, Potentiale, VDIVerlag, Düsseldorf, 1993. 113. Ruan, D., Kerre E.E., Fuzzy implication operators and generalized fuzzy method of cases, Fuzzy Sets Syst., 54, 1993, 23-37. 114. Sugeno, M. (ed.), Industrial Applications of Fuzzy Control, No ...
... control systems: fuzzy logic controller - part2, IEEE Transactions on Systems, Man, and Cybernetics, 20(2), 1990, 419-435. 124. Bai Y., Zhuang, H., Wang, D., Fundamentals of Fuzzy Logic Control - Fuzzy Sets, Fuzzy Rules and Defuzzifications, Advanced Fuzzy Logic Technologies in Industrial Applications ...
... synthesis with a fuzzy logic controller, International Journal of Man-Machine Studies, 7(1), 1975, 1-13. 122. Lee, C.-C., Fuzzy logic in control systems: fuzzy logic controller - part1, IEEE Transactions on Systems, Man, and Cybernetics, 20(2), 1990, 404-418. 123. Lee, C.-C., Fuzzy logic in control ...Milanka N. Negovanović. "Model predviđanja potresa od miniranja na površinskim kopovima primenom simulacione metode Monte Karlo i fazi logike" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-06-30)
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Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria
The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijumaVladimir Krivošić, Luka Crnogorac, Rade Tokalić. "Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria" in Underground mining engineering, University of Belgrade - Faculty of Mining and Geology (2024)
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Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova
Zoran M. Štirbanović (2015-07-01)Rudarstvo, a u okviru njega i priprema mineralnih sirovina, se odlikuje složenošću tehnoloških procesa što je posledica velikog broja uticajnih parametara. Samim tim je potrebno biti veoma obazriv prilikom donošenja odluka u oblasti rudarstva. U cilju što efikasnijeg funkcionisanja procesa, moguće je primeniti različite metode koje služe za pojednostavljenje procesa odlučivanja. Jedna od takvih metoda jeste i teorija grubih skupova. Ona predstavlja relativno novu matematičku teoriju koja je pogodna za razumevanje nepreciznih i nepotpunih podataka kao i za otkrivanje ...rudarstvo, priprema mineralnih sirovina, teorija grubih skupova, višekriterijumsko odlučivanje, flotacijsko jalovište, flotacijski kolektor, flotaciona mašina... Zanimljivo je uporediti definicije klasičnih skupova, rasplinutih (fuzzy) skupova i grubih skupova. Klasični skup je primitivni pojam i definiše se intuitivno ili aksiomatski. Rasplinuti (fuzzy) skupovi se definišu korišćenjem funkcije fuzzy pripadnosti, koja uključuje napredne matematičke strukture ...
... rasplinute (fuzzy) pripadnosti. Svojstva 5 i 6 pokazuju da se pripadnost za uniju i presek skupova, generalno ne može izračunati iz pripadnosti njihovih članova, kao što je slučaj kod rasplinutih (fuzzy) skupova. Prema tome gruba pripadnost je formalno generalizacija rasplinute (fuzzy) pripadnosti ...
... klasifikovao gene odgovorne za nastanak raka. Dai i Xu [33] su pomoću teorije fuzzy grubih skupova su izvršili selekciju atributa u cilju lakše klasifikaciju tumora. Hassanien [34] je kombinujući prednosti fuzzy i grubih skupova napravio hibridnu šemu koja na osnovu analize slika vrši detekciju ...Zoran M. Štirbanović. "Modeliranje tehnoloških procesa u rudarstvu u uslovima nedovoljnosti podataka primenom teorije grubih skupova" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2015-07-01)
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On the compatibility of lexical resources for NooJ
Lexical resources for many languages are provided for the NooJ linguistic development environment. Meta-data descriptions of morphosyntactic and semantic properties of these languages and their resources are a mandatory part of each language module. In this paper we analyze how well the meta-data actually describe resources for a chosen subset of languages and to what extent are they compatible across languages to support multilingual processing. We show that there is place for improvement in both directions.... graphs result from different ways categories and properties are determined and annotated. All three graphs recognize numbers written in digits by thepattern, whereas for numbers written in words the English graph uses the pattern, which also recognizes other determiners, whereas Croatian ...
... Croatian usesand Serbian uses and for numerical nouns. All these graphs, after they recognize one or more numbers connected by a comma or a conjunction ( or ), invoke their specific „measure“ sub- graphs which recognize different measure units, either as character strings: ...
... and was well rigged for running before the wind... The next source of false recognition is more serious. Namely, in the English e-dictionary numbers are marked as determiners, which represent a wider category, as illustrated by the following example. En: Squarely in his armchair, his feet close ...Ranka Stanković, Miloš Utvić, Duško Vitas, Cvetana Krstev, Ivan Obradović. "On the compatibility of lexical resources for NooJ" in Automatic Processing of Various Levels of Linguistic Phenomena: Selected Papers from the 2011 International Nooj Conference, Cambridge Scholars Publishing (2012): 96-108