Претрага
513 items
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Risk Evaluation: Brief Review and Innovation Model Based on Fuzzy Logic and MCDM
Stevan Djenadic, Milos Tanasijevic, Predrag Jovancic, Dragan Ignjatovic, Dejan Petrovic, Ugljesa Bugaric (2022)The risk assessment of engineering systems represents an important part of the quality of service and dependability. The existing methods for risk evaluation use crisp sets for rating partial indicators’ proposition and their cumulative products as an overall indicator. In this paper, existing FMEA and FMECA methods have been improved using the fuzzy expert system for calculating the risk priority number. The application of fuzzy logic allows the use of linguistic descriptions for risk analysis. In this way, the ...Stevan Djenadic, Milos Tanasijevic, Predrag Jovancic, Dragan Ignjatovic, Dejan Petrovic, Ugljesa Bugaric. "Risk Evaluation: Brief Review and Innovation Model Based on Fuzzy Logic and MCDM" in Mathematics, MDPI AG (2022). https://doi.org/10.3390/math10050811
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Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine
Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić. "Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine" in SSRN Electronic Journal, Elsevier BV (2021). https://doi.org/10.2139/ssrn.3945617
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Geomehanical Aspects Of The Openpit Mutalj External Landfill Design
Čebašek Vladimir, Gojković Nebojša, Dimitrijević Bojan, Rupar Veljko. "Geomehanical Aspects Of The Openpit Mutalj External Landfill Design" in Proceedings of the 13th International Symposium Continuous surface mining ISCSM 2016, Beograd:Yugoslav Opencast Mining Committee (2016): 33-44
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Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine
Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...... the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine Stevan Djenadic 1,*, Dragan Ignjatovic 1, Milos Tanasijevic 1, Ugljesa Bugaric 2, Ivan Jankovic 3 and Tomislav Subaranovic 1 1 Faculty of Mining and Geology, University of Belgrade ...
... the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine Stevan Djenadic !*, Dragan Ignjatovic !, Milos Tanasijevic 1, Ugljesa Bugaric 7, Ivan Jankovic > and Tomislav Subaranovic ! 1 Faculty of Mining and Geology, University of Belgrade ...
... PA, USA, 2000. 29. Djenadic, S.; Jovancic, P.; Ignjatovic, D.; Miletic, F.; Jankovic, I. Analiza primene višekriterijumskih metoda u optimizaciji izbora hidrauličnih bagera na površinskim kopovima. Tehnika 2019, 70, 369–377. [CrossRef] 30. Ignjatovic, D.; Jovancic, P. Optimisation of Operation and ...Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović. "Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine" in Energies, MDPI AG (2019). https://doi.org/10.3390/en12214044
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Effectiveness Analysis of Different Bucket-wheel Excavators
Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić. "Effectiveness Analysis of Different Bucket-wheel Excavators" in 8th International Conference Mining and Environmental Protection, Sokobanja, 22-25 September 2021, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2021)
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Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining
Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)... energies Article Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining Ivan Jankovic 1, Stevan Djenadic 2, Dragan Ignjatovic 2, Predrag Jovancic 2, Tomislav Subaranovic 2 and Ivica Ristovic 2,* 1 Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre ...
... energies (mort, Article Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining Ivan Jankovic 1, Stevan Djenadic 7, Dragan Ignjatovic *, Predrag Jovancic 2, Tomislav Subaranovic 2 and Ivica Ristovic *’* 1 2 Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre ...
... 978-86-83497-25-6. 11. Ristovic, I.; Ignjatovic, D. The Reliability of Dozers on the Open Pits of Lignite in Serbia. In Proceedings of the International Carpathian Control Conference, Podbanske, Slovakia, 23–26 May 2000; pp. 153–158, ISBN 80-7099-510-6. 12. Ignjatovic, D.; Ristovic, I.; Stojakovic, M. ...Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović . "Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining" in Energies, MDPI (2019). https://doi.org/https://doi.org/10.3390/en12122245
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The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers
One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...... bulldozers Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers | Dragan Ignjatović ...
... Metallurgy, 2008, pp. 297-305. Life Cycle Asset Management, Life Cycle Engineering, Inc. Available online: www.LCE.com 6. Jankovic, I.; Djenadic, S.; Ignjatovic, D.; Jovancic, P.; Subaranovic, T.; Ristovic, I. Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining. Energies 2019 ...
... PROTECTION 25 - 28 September 2019, Vrdnik, Serbia THE OPTIMIZATION OF AUXILIARY MACHINERY IN OPEN-CAST LIGNITE MINES: A CASE STUDY OF BULLDOZERS Dragan Ignjatović!, Predrag Jovančić!, Stevan Đenadić!, Ivan Janković?, Ivica Ristović! !- University ог Belgrade – Faculty ог Mining and Geology, Belgrade ...Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović. "The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers" in 7th International Symposium Mining and Environmental Protection, University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia (2019)
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Izbor rotornih bagera za proces revitalizacije: primer rotornih bagera SRs 1200 u rudarskom basenu Kolubara
Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić, Goran Todorović, Dragan Novaković (2020)Revitalizacija je proces ili skup tehničkih zahvata na mašini kojim se vrši zamena svih dotrajalih ili oštećenih delova metalne konstrukcije. Sastavni deo procesa revitalizacije je i modernizacija zastarele elektro-mašinske opreme. Principi revitalizacije sasvim sigurno nisu sadržani u okviru redovnog godišnjeg ili dnevnog održavanja. Oni predstavljaju održavanje onih veličina koje su značajne za mašinu kao celinu (u ovom slučaju rotorni bager). U ovom radu su analizirani rotorni bageri oznake SRs 1200. Na površinskim kopovima rudarskog basena Kolubara takvih bagera ima ...Predrag Jovančić, Dragan Ignjatović, Stevan Đenadić, Filip Miletić, Goran Todorović, Dragan Novaković. "Izbor rotornih bagera za proces revitalizacije: primer rotornih bagera SRs 1200 u rudarskom basenu Kolubara" in XIV Međunarodna konferencija OMC 2020, Zlatibor, Srbija, 14-17. oktobar 2020., Jugoslovenski komitet za površinsku eksploataciju (2020)
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Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS
Jedan od osnovnih zadataka na površinskim kopovima uglja je ostvarivanje zadovoljavajućeg vremenskog i kapacitetnog iskorišćenja kontinualnih sistema. Da bi se to postiglo, neophodno je izvršiti izmene u postojećoj strategiji održavanja. Preduslov je uvođenje agregatne zamene vitalnih delova na rudarskim mašinama. Benefiti su višestruki. Očekivani rezultati ovakvog pristupa su: smanjenje zastoja i povećanje vremena rada; direktne materijalne uštede; bolja organizacija rada; racionalizaciju radioničkih i magacinskih kapaciteta; povećanje vrednosti mašina. Da bi se uvela agregatna zamena neophodne su investicije za nabavku ...Predrag Jovančić, Ignjatović Dragan, Đenadić Stevan. "Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS" in X Međunarodna konferencija UGALJ, Zlatibor, Srbija, 13-16. Oktobar 2021., Jugoslovenski komitet za površinsku eksploataciju (2021)
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BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations
Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina. "BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations" in 17th International Conference of the open and underwater mining of minerals, Sts. Constantine and Helena Resort, Varna, 18-22 September, Bulgaria, Sofia, Bulgaria : Scientific and Technical Union of Mining, Geology and Metallurgy, (2023)
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Ground displacement estimation using DInSAR technique
Ilić Dragana, Đurić Dragana (2018)Ilić Dragana, Đurić Dragana. "Ground displacement estimation using DInSAR technique" in Abstract Book 17th Serbian Geological Congress, May 17‐20 2, Beograd:Srpsko geološko društvo (2018): 742-746
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Utvrđivanje koseizmičkih deformacija tla upotrebom DInSAR tehnike
Đurić Dragana, Ilić Dragana (2018)Đurić Dragana, Ilić Dragana. "Utvrđivanje koseizmičkih deformacija tla upotrebom DInSAR tehnike" in Tehnika no. 4, Beograd:Savez inženjera i tehničara Srbije (2018): 503-509. https://doi.org/10.5937/tehnika1804503D
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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 ...... Safety analyses and synthesis using fuzzy sets and evidential reasoning. Reliability Engineering and System Safety, 47(2), 103-118, 1995. [9] Ignjatovic, D., Jovancic, P., Optimization of operation and costs of auxiliary mechanization in order to increase the utilization of overburden and coal systems ...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)
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Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic
This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композицијаMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović. "Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic" in Energies, MDPI AG (2022). https://doi.org/10.3390/en15186786
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Research on Power Plant Ash Impact on the Quality of Soil in Kostolac and Gacko Coal Basins
Savić Dragana, Nišić Dragana, Malić Nenad, Dragosavljević Zlatko, Medenica Dragan. "Research on Power Plant Ash Impact on the Quality of Soil in Kostolac and Gacko Coal Basins" in Minerals 54 no. 8 (2), Basel, Switzerland:MDPI AG (2018): 1-16. https://doi.org/doi:10.3390/min8020054
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Геолошке карактеристике и 3d модел лежишта угља Соко (Сокобањски басен)
Марсенић Драгослав, Животић Драгана, Јоковић Драган. "Геолошке карактеристике и 3d модел лежишта угља Соко (Сокобањски басен)" in Зборник радова 15. конгреса геолога Србије са међународним учешћем, Београд, [26-29 мај] 2010. = Proceedings of the 15th Congress of Geologists of Serbia with International Participation, Belgrade [26-29 May] 2010, Београд:Српско геолошко друштво (2010): 252-253
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Improving the quality of environmental education through training of teachers for implementation of ICT in the processing of significant environmental dates
Ranđelović Dragan, Damjanović Zvonko, Ranđelović Dragana. "Improving the quality of environmental education through training of teachers for implementation of ICT in the processing of significant environmental dates" in Proceedings / XIX International Scientific and Professional Meeting Ecological Truth, Eco-Ist '11, 01-04 June 2011, Bor, Serbia, Bor:Tehnical Faculty Bor, University of Belgrade (2011): 535-540
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Karst Plateau Dubašnica as Geopark – Contemporary model for Geoheritage protection in Serbia
Ranđelović Dragana, Ranđelović Dragan, Ilić Marina. "Karst Plateau Dubašnica as Geopark – Contemporary model for Geoheritage protection in Serbia" in Proceedings / XXII International Conference Ecological Truth, Eco-Ist '14, 10-13 June 2014, Bor, Serbia, Bor:Tehnical Faculty Bor, University of Belgrade (2014): 40-46
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Optimizacija reznih elemenata rotornog bagera pri otkopavanju uglja
Jovančić Predrag, Ignjatović Dragan, Novaković Dragan. "Optimizacija reznih elemenata rotornog bagera pri otkopavanju uglja" in V Međunarodna konferencija UGALJ 1, Zlatibor:Rudarsko-geološki fakultet (2011): 124-138
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Timok Scientific Tornado- TNT - a model for science popularization and the development of competencies through cooperation with the stakeholders
Ranđelović Dragan, Randjelović Nataša, Ranđelović Dragana. "Timok Scientific Tornado- TNT - a model for science popularization and the development of competencies through cooperation with the stakeholders" in Proceedings of XXV International Conference on Ecological Truth, :Univerzitet u Beogradu, Tehnički fakultet u Boru Univerzitet u Beogradu, Tehnički fakultet u Boru (2017): 478-484