Претрага
2342 items
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Spin activity correlations in driven disordered systems
Statistics, Probability and Uncertainty, Statistics and Probability, Statistical and Nonlinear PhysicsĐorđe Spasojević, Sonja Radić, Dragutin Jovković, Sanja Janićević. "Spin activity correlations in driven disordered systems" in Journal of Statistical Mechanics: Theory and Experiment, IOP Publishing (2022). https://doi.org/10.1088/1742-5468/ac72a2
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The effect of finite driving rate on avalanche distributions
Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear PhysicsSonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević. "The effect of finite driving rate on avalanche distributions" in Journal of Statistical Mechanics: Theory and Experiment, IOP Publishing (2021). https://doi.org/10.1088/1742-5468/ac1f12
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Uticaj geološke neizvesnosti u razvoju rudarskih projekata
Rudarstvo je industrija koja se nosi sa različitim vrstama neizvesnosti i rizika zbog svoje prirode i specifičnosti. Neizvesnost u rudarstvu može poticati iz različitih izvora i uticati na različite aspekte rudarskih projekata. Kao jedan od dominantnih faktora, ističe se geološka neizvesnost. Geološka neizvesnost igra ključnu ulogu u rudarstvu i može značajno uticati na procenu resursa i rezervi, planiranje eksploatacije, ekonomsku isplativost i upravljanje rizicima. Ova neizvesnost se ne može eliminisati, ali se uz primenu adekvatnih standarda i zakona može ...... its nature and specificity. Uncertainty in mining can come from different sources and affect different aspects of mining projects. Geological uncertainty stands out as one of the dominant factors. Geological uncertainty plays a key role in mining and can significantly affect resource and reserve estimation ...
... economic profitability and risk management. This uncertainty cannot be eliminated, but with the application of adequate standards and laws, it can be reduced. Through this paper, the differences in regional and foreign practice from the aspect of categorization of resources and reserves, as well as the ...
... s, R., Farrelly, C. T., and Cheuiche Godoy, M. (2002). Moving forward from traditional optimization: Grade uncertainty and risk effects in open-pit design. Transactions of the Institution of Mining and Metallurgy , 3, 82-88. [7] Edwards A.C. (2001). Mineral resource and ore reserve estimation : ...Petar Marković, Dejan Stevanović, Mirjana Banković. "Uticaj geološke neizvesnosti u razvoju rudarskih projekata" in XI Međunarodna konferencija "Ugalj i kritični minerali 2023", CCM 2023, Zlatibor, 11-14. oktobar 2023., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2023)
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Model of room and pillar production planning in small scale underground mines with metal price and operating cost uncertainty
Gligorić Zoran, Gligorić Miloš, Dimitrijević Bojan, Grozdanović Ines, Milutinović Aleksandar, Ganić Aleksandar, Gojković Zoran (2018)Gligorić Zoran, Gligorić Miloš, Dimitrijević Bojan, Grozdanović Ines, Milutinović Aleksandar, Ganić Aleksandar, Gojković Zoran. "Model of room and pillar production planning in small scale underground mines with metal price and operating cost uncertainty" in Resources Policy, The International Journal of Minerals Policy and Economics, Amsterdam, Holandija:Elsevier (2018)
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Uncertainty in open pit optimisation
Kolonja Božo, Stevanović Dejan, Pešić Georgiadis Milica, Banković Mirjana, Kolonja Ljiljana. "Uncertainty in open pit optimisation" in 5th International symposium Mining and environmental protection, Beograd:Faculty of Mining and geology, Belgrade (2015): 358-392
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Quantification of Uncertainty in Mining Project Related to Metal Price Using Mean Reversion Process and Interval Type-2 Fuzzy Sets Theory
Gligorić Zoran, Beljić Čedomir, Gluščević Branko. "Quantification of Uncertainty in Mining Project Related to Metal Price Using Mean Reversion Process and Interval Type-2 Fuzzy Sets Theory" in Podzemni radovi no. 22, Beograd:Univerzitet u Beogradu, Rudarsko-geološki fakultet (2013): 71-84
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Uncertainty of carbon dioxide emission factor for natural gas
Živković Marija, Ivezić Dejan, Danilović Dušan, Madžarević Aleksandar. "Uncertainty of carbon dioxide emission factor for natural gas" in 5th International Scientific Conference on «Energy and Climate Change» no. 5, Atina:University of Athens, KEPA (2012): 192-199
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Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty
... as adverse weather conditions, inaccessible field and inexperience of workers. Due to these problems, sometimes the results of measurements are not so accurate and precise. Presence of vague and imprecise data is the basic indicator of uncertainty. In order to overcome these problems it is necessary ...
... anisotropy on the isotropic and anisotropic samples. In order to avoid measurement errors, interval numbers are applied to compute these indicators. Uncertainty of input parameters implies defining a boundaries above these data thereby increasing the flexibility and reliability of the computational ...
... WAVES PROPAGATION VELOCITIES WITH UNCERTAINTY Miloš Gligorić1, Jelena Majstorović1, Suzana Lutovac1 Received: May 11, 2018 Accepted: June 15, 2018 Abstract: Almost all of rock masses are more or less anisotropic medium. Foliation, layering, cracking and cleavage are some of the rock attributes ...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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A tool for identifying the criticality in the disordered systems with metastable dynamics
Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević. "A tool for identifying the criticality in the disordered systems with metastable dynamics" in Physica A: Statistical Mechanics and its Applications, Elsevier BV (2021). https://doi.org/10.1016/j.physa.2021.125883
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Application of stochastic models for mine planning and coal quality control
... decisions about coal homogenization must deal with uncertainty and variability in coal properties, and with the effect of off-design coal characteristics on power plant performance and cost. According to Shih and Frey [3] sulfur and ash content and heating value are considered as normally distributed ...
... (mean) costs of coal blending and (2) the variance of coal blending costs. The cost objective function includes coal purchasing cost, ash disposal cost, sulfur removal cost, and fuel switch- ing costs. Chance constraints include several risk measures, such as the probability of exceeding the sulfur emission ...
... of relevant geological attributes [8, 14]. Fluctua- tions in mining engineering and geochemical attributes of interest are also relevant for mine de- sign and production scheduling. For example, mapping the probability of grades exceeding a limiting threshold within different areas of a deposit can ...Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković. "Application of stochastic models for mine planning and coal quality control" in Thermal Science, Belgrade : Vinča Institute of Nuclear Sciences (2014). https://doi.org/10.2298/TSCI130201031S
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Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia
Dragoljub Bajić, Dušan Polomčić (2014)A groundwater control system was designed to lower the water table and allow the pumping sta-tion “Bezdan 1” to be built. Based on a hydrodynamic analysis that suggested three alternative solutions, mul-ticriteria optimization was applied to select the best alternative. The fuzzy analytic hierarchy process methodwas used, based on triangular fuzzy numbers. An assessment of the various factors that influenced the selec-tion of the best alternative, as well as fuzzy optimization calculations, yielded the “weights” of the alternativesand the ...groundwater lowering, groundwater management scenario, fuzzy analytic hierarchy process,expert knowledge, triangular fuzzy numbers, linguistic variables... source of uncertainty, because of the transfer of both information and knowledge cou- pled with various uncertainty and imprecision (KOSKO 1993). This is the reason why fuzzy logic systems are distinguished, given that their essence is to handle knowledge that can be highly imprecise and expressed verbally ...
... ns of variables and their values produce linguistic statements (expressions), which constitute a bridge between numerical representation of informa- tion on a computer and human thinking. ZADEH (1975) introduced the “linguistic (fuzzy) variable”, which is the value of an uncertainty described by a ...
... availability under decision maker uncertainty. Environmental Earth Science, 71 (6): 2559–2572. VAN LAARHOVEN, P.J.M. & PEDRCYZ, W. 1983. A fuzzy extension of Saaty’s priority theory. Fuzzy Sets and Sy- stems, 11: 229–241. ZADEH, L.A. 1965. Fuzzy Sets, Information and Control, 8 (3): 338–353. ZADEH, ...Dragoljub Bajić, Dušan Polomčić. "Fuzzy optimization in hydrodynamic analysis of groundwater control systems: Case study of the pumping station “Bezdan 1”, Serbia" in Geološki anali Balkanskoga poluostrva, Belgrade : University of Belgrade - Faculty of mining and geology (2014). https://doi.org/10.2298/GABP1475103B
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A decision support system for mine project selection under uncertainty using fuzzy topsis technique
Gligorić Zoran, Beljić Čedomir, Gluščević Branko, Jovanović Saša. "A decision support system for mine project selection under uncertainty using fuzzy topsis technique" in Proceedings of the 23rd International Mining Congress of Turkey, Antalya,Turkey:Chamber of Mining Engineers of Turkey (2013): 1471-1482
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Integrated energy planning approach for accelerating energy transition of households
The success of energy transition planning depends on several influential and variable factors that need to be considered and tracked in modeling to support policymakers. Expert-based energy models are mainly developed following the assumptions of experts and, in most cases, a limited number of stakeholders. This top-down modeling approach will provide satisfactory results in centrally managed energy sectors (electricity generation and distribution, district heating, etc.), where further decisions could be projected relatively precisely. However, the same approach will not ...Energetsko planiranje, Integrisano energetsko modeliranje, Energetska tranzicija, Domaćinstva, Individualno grejanje, LEAPBoban Pavlović, Marija Živković, Dejan Ivezić. "Integrated energy planning approach for accelerating energy transition of households" in Energy Reports, Elsevier BV (2023). https://doi.org/10.1016/j.egyr.2023.11.016
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Multi-Criteria Fuzzy-Stochastic Diffusion Model of Groundwater Control System Selection
When considering data and parameters in hydrogeology, there are often questions of uncertainty, vagueness, and imprecision in terms of the quantity of spatial distribution. To overcome such problems, certain data may be subjectively expressed in the form of expert judgment, whereby a heuristic approach and the use of fuzzy logic are required. In this way, decision-making criteria relating to an optimal groundwater control system do not always have a numerical value. Groundwater control scenarios (alternatives) are identified through hydrodynamic ...expert judgment, linguistic variables, fuzzy dynamic TOPSIS, hydrogeology, groundwater control system, open-cast mine, geometric Brownian motionDušan Polomčić, Zoran Gligorić, Dragoljub Bajić, Miloš Gligorić, Milanka Negovanović. "Multi-Criteria Fuzzy-Stochastic Diffusion Model of Groundwater Control System Selection" in Symmetry, MDPI AG (2019). https://doi.org/10.3390/sym11050705
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Ograničenja primene optimizacionih algoritama u slučaju kopova
Proces optimizacije površinskih kopova, kao sastavni deo strateškog planiranja, veoma je važan sa stanovišta ostvarivanja maksimalnih efekata proizvodnje. To je složen zadatak koji vrlo često podleže vrlo strogim geometrijskim i drugim praktičnim rudarskim ograničenjima. Ova ograničenja u posebno su izražena na površinskim kopovima uglja, te u značajnoj meri mogu povećati stepen neizvesnosti rudarskog projekta, odnosno izazvati neželjena dejstva u pogledu profitabilnosti poslovanja. Iz tog razloga, veoma je važna primena savremenih optimizacionih alata, koji u značajnoj meri mogu olakšati celokupan ...... complex task that is very often subject to very strict geometric and other practical mining restrictions. These limitations are particularly pronounced in open pit coal mines, and can significantly increase the degree of uncertainty of the mining project, or cause side effects in terms of business ...
... reason, it is very important to apply modern optimization tools, which can significantly facilitate the entire optimization process, and also reduce business uncertainty. ! Stevanović Dejan, Univerzitet u Beogradu, Rudarsko-geološki fakultet, Beograd ? Banković Mirjana, Univerzitet u Beogradu, R ...
... Plants Through Mine Coal Quality Planning and Control. Thermal Science, 22(1B), pp.721-733, 2017 Benndorf J.: Investigating the variability of key coal quality parameters in continuous mining operations when using stockpiles. Advances in Orebody Modelling and Strategic Mine Planning I. AusiMM, 2011 ...Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Petar Marković, Dejan Ranković. "Ograničenja primene optimizacionih algoritama u slučaju kopova" in XIV Međunarodna konferencija OMC 2020, Zlatibor, Srbija, 14-17. oktobar 2020., Beograd : Jugoslovenski komitet za površinsku eksploataciju (2020)
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Improving efficiency of thermal power plants through mine coal quality planning and control
Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja. "Improving efficiency of thermal power plants through mine coal quality planning and control" in Thermal Science, Vinča Institute of Nuclear Sciences (2018). https://doi.org/10.2298/TSCI170605209B
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Probabilistic analysis of anisotropic rock slope with reinforcement measures
During the construction of E75 highway through Grdelica gorge in Serbia, a major failure occurred in the zone of reinforced rock slope. Excavation was performed in highly anisotropic Paleozoic schist rock formation. The reinforcement consisted of the two rows of micropile wall with pre-stressed anchors. Forces in anchors were monitored with load cells while benchmarks were installed for superficial displacement measurements. The aim of the study is to investigate possible causes of instability considering different probability distributions of the ...Zoran Berisavljević, Dušan Berisavljević, Miloš Marjanović, Svetlana Melentijević. "Probabilistic analysis of anisotropic rock slope with reinforcement measures" in Geomechanics and Engineering (2023). https://doi.org/10.12989/gae.2023.34.3.285
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Long-term planning methodology for improving wood biomass utilization
The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković. "Long-term planning methodology for improving wood biomass utilization" in Energy, Elsevier BV (2019). https://doi.org/10.1016/j.energy.2019.03.105
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Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic
Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...... different processes dominated by uncertainty, multidimensionality, subjectivity, and indeterminacy, and can only be displayed expertly. In order to form the optimization model, it is necessary to reduce the indicated parameters to the same form in the analytical sense and to find a synthesis model. 3 ...
... within the reference values (Table 2), and a synthesis part, input parameters, reduced into one. It is evident that the model is rife with uncertainty, indeterminacy, multidimensionality, and relativity. The model must have an inference engine. The new mathematical and conceptual model of optimized selection ...
... within the reference values (Table 2), and a synthesis part, input parameters, reduced into one. It is evident that the model is rife with uncertainty, indeterminacy, multidimensionality, and relativity. The model must have an inference engine. The new mathematical and conceptual model of optimized selection ...Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković. "Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic" in Energies, MDPI AG (2020)
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A Fuzzy Expert Model for Availability Evaluation
Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...... which can absorb partial indicators of the availability, including their uncertainty, diversity, relativity. In this article, an expert’s fuzzy model is presented to analyze and integrate reliability, maintainability, and functionality of three types of bulldozers that operate at the lignite ...
... purchase of new machines. II. AVAILABILITY EVALUATION Availability is the probability that an item will be in an operable and committable state at the start of a mission when the mission is called for at a random time and is generally defined as uptime divided by total time (uptime plus downtime) ...
... moment, or during a given interval of time, and assuming the necessary supply is provided (external resources). Availability may also be expressed as the probability that the system will be available at any calendar time, that is, it will be able to operate or to get involved. Availability should not ...Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić. "A Fuzzy Expert Model for Availability Evaluation" in Proceedings of the 2019 20th International Carpathian Control Conference (ICCC), AGH University of Science and Technology, Kraków - Wieliczka, Poland (2019)