Претрага
463 items
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Употреба веб платформе Омека за дигиталне библиотеке из домена рударства
У овом раду биће представљена Омека, веб платформа за приказивање дигиталних колекциjа и систем за управљање њиховим садржаjем. Њену примену у области техничких наука, а конкретно у области рударства, приказаћемо на примеру дигиталне библиотеке ROmeka@RGF. За Омеку смо се определили првенствено због чињенице да jе jедноставна за коришћење, има обимну пратећу документациjу и не захтева уско специфичне информатичке вештине што jе чини приступачном за већину корисника, а нарочито за рударске инжењере, коjима jе ова дигитална библиотека првенствено намењена. Документа ...... свеобухватан током претраживања релевантних информациjа. Проблеми у претраживању текстуелних ресурса се могу класификовати у две категориjе: – општи, коjи не зависе од jезика и – проблеми коjи су специфични за поjедини jезик или групу jезика. Проблем при претраживању текстова на српском jезику представљаjу ...
... jеднине за именице, инфинитив за глагол) (Lazić et al., 2016). Међутим, документа могу садржати било коjи флективни облик променљиве речи. Оваj проблем постаjе сложениjи ако се у обзир узму и сложене речи и синоними (Stanković, 2009). Елементи дигиталне библиотеке коjе jе могуће укључити у процес ...Александра Томашевић, Биљана Лазић, Далибор Воркапић, Михаило Шкорић, Љиљана Колоња. "Употреба веб платформе Омека за дигиталне библиотеке из домена рударства" in Инфотека, Филолошки факултет, Универзитет у Београду; Универзитетска библиотека „Светозар Марковић“; Заједница библиотека универзитета у Србији (2017)
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A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice
Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...... the process of mine ventilation planning and design.7–10 In this paper, we propose a six-step approach to the solution of mine ventilation design problem, the design itself of the network being just one of these steps. The approach is illustrated by a component diagram on Fig. 1 showing the interconnec- ...
... be related to particular objects KAPPA-PC offers the possibility of specifying rules independently, using a rule ed- itor as shown in Fig. 9. The problem-solving process in VENTEX unfolds by means of the KAPPA-PC backward chaining inference engine. Goals to be satisfied by backward chaining are defined ...
... available for MS Windows applications. It enables a straightforward and easy manipulation of input data and control over different components of the problem-solving process. Through the interface the system also offers suggestions and recommendations to the user for the improvement of the overall performance ...Nikola Lilić, Ivan Obradović, Ranka Stanković. "A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice" in Mineral Resources Engineering 11 no. 4, Imperial College Press (2002): 361-382. https://doi.org/10.1142/S0950609802001014
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Енергетска безбедност Европске уније у светлу актуелне енергетске транзиције
Бобан Павловић, Дејан Ивезић (2021)Енергетска стратегија Европске уније, која од 2015. године обухвата и циљеве у области климатских промена, тежи изградњи „енергетске уније” која потрошачима из ЕУ даје сигурну, приступачну, чисту и одрживу енергију. Енергетска политика ЕУ поставља пред себе амбициозне циљеве у погледу коришћења обновљивих извора – учешће од 32% до 2030. године. Овако опсежну и динамичну енергетску транзицију у Европи усложњава хетерогеност националних енергетских система у погледу структуре енергетског микса, нивоа увозне зависности, као и нивоа технолошког, друштвеног и економског ...енергетска безбедност, Европска унија, енергетски показатељи, природни гас, обновљиви извори енергије... и то у зимском периоду када је највећа потрошња. Међутим, криза је показала да главни проблем није био недостатак довољних количина гаса. Наиме, унутрашње тржиште гаса ЕУ имало је довољно гаса, али је проблем био у физичкој немогућности да се гас испоручи угроженим чланицама, пре свих, у југоисточној ...
... увоз утечњеног природног гаса (УПГ) (енгл. Liquified Natural Gas), Шпанија је чланица ЕУ са највећим бројем терминала, тренутно седам. Оно што је проблем јесте недовољна повезаност Шпаније са гасоводима других чланица [22]. Укупно гледано, у ЕУ постоји 36 терминала, а додатних 27 је у фази изградње ...
... друге државе напоре својих „зеленијих” суседа доживљавају као сметњу која доводи у питање сигурност снабдевања по приступачним ценама и доноси проблеме у мрежи и нестабилност цена без икаквих користи [5]. Даљи продор обновљивих извора енергије у енергетски систем ЕУ захтеваће консензус чланица и ...Бобан Павловић, Дејан Ивезић. "Енергетска безбедност Европске уније у светлу актуелне енергетске транзиције" in Безбедносни форум, Евроазијски безбедносни форум, Београд (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)... depends on the evaluation of experts for defining priority scales [28]. Firstly, in order to make the right decision, it is necessary to define the problem, the purpose of making the decision, the criteria and sub-criteria for the evaluation of alternatives, alternative activities that should be carried ...
... correct decisions are made when there are only two alternatives available in one interaction. The main principle of the AHP method is that a complex problem should be broken down into its elementary components which are then compared in pairs. Every component of the hierarchical model is compared in pairs ...
... mathematical basis of the AHP method consists of four steps: 1. Production of a hierarchical model, that is, the structure of the decision-making problem (presented in Figure 2); 2. The use of an appropriate Saaty scale of the relative importance in reciprocal comparison of the elements of the structure ...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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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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Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs
Saša Milanović, Ljiljana Vasić (2021)Saša Milanović, Ljiljana Vasić. "Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs" in Hydrogeology Journal, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10040-020-02280-1
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Indexing of textual databases based on lexical resources: A case study for Serbian
In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...... scanning the text of appropriate fields with given keywords while word boundaries are not taken into consideration. This can par- tially solve the problem of the rich morphology that characterizes Serbian, as a language belonging to the South-Slavic Language family. For instance, scanning with lignit ...
... explained before, the old system does not require alignment with whole words precisely in order to recognize at least some inflectional forms. This problem is generated by query keywords such as the chemical symbol for gold “Au” or the name of the company “NIS”. In such cases, the accuracy of the new ...
... PETAR, Dr Petar Petrović, do- cent, Mr Petar Petrović, asistent, docent Dr Petar Petrović, Mr. Petar Petrović, asistent, Petrović. The biggest problem of the new system are specific technical terms that are not found in electronic dictionaries as well as quite a number of typographical errors in the ...Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović. "Indexing of textual databases based on lexical resources: A case study for Serbian" in Semantic Keyword-based Search on Structured Data Sources : First COST Action IC1302 International KEYSTONE Conference, IKC 2015, Coimbra, Portugal, September 8-9, 2015. Revised Selected Papers, Springer (2015). https://doi.org/10.1007/978-3-319-27932-9_15
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Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support
Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović. "Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support" in Journal of Vibroengineering (2017). https://doi.org/10.21595/jve.2016.17321
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Integracija heterogenih tekstualnih resursa
Ranka Stanković, Ivan Obradović (2007)U radu je opisan pristup integraciji heterogenih tekstualnih resursa za srpski jezik uz pomoć jednog kompleksnog softverskog alata, razvijenog specijalno za ove potrebe. Opisani su struktura i osnovne komponente razvijenog sistema. Iznete su i mogućnosti unapređivanja resursa međusobnom razmenom informacija, koje pruža razvijeno integrisano okruženje. Konačno, opisana je i mogućnost primene integrisanih heterogenih resursa za proširenje upita, kao i pretraživanje tekstova uopšte, a naznačeni su i neki od pravaca daljeg razvoja.... kojim bi se olakšalo njihovo održavanje, korišćenje i integracija, ali i omogućio dalji efikasan razvoj. Pored različitih formata resursa, poseban problem bili su i različiti kodni rasporedi koji su se vremenom javljali u resursima, počev od tzv. aurora zapisa, u kome su slova ć, č, š, ž, đ, dž, lj ...
... i nj kodirana ACCII karakterima cx, cy, sx, zx, dx, dy, lx i nx, preko ISO 8859-2 i ISO 2 8859-5 koda, pa do Unicodea. Da bi se rešili ovi problemi heterogenosti, nastalo je integrisano i prilagodljivo softversko rešenje, nazvano WS4LR (Work Station for Lexical Resources) kojim je omogućeno ...
... pitanju pretraživanja teksta. U velikom broju slučajeva ove dodatne informacije mogu da se koriste za uklanjanje višeznačnosti, odnosno rešavanje problema homonimije. Morfološke, sintaksičke i semantičk stih oblika reči i pridružiti rečima odgovarajućeg sinseta u SWN. Na primer, u sinsetovima: ...Ranka Stanković, Ivan Obradović. "Integracija heterogenih tekstualnih resursa" in Zbornik radova međunarodnog simpozijuma Razlike između bosanskog/bošnjačkog, hrvatskog i srpskog jezika, Graz, Austria, April 2007, - (2007)
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Frequency and Length of Syllables in Serbian
Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová (2019)Basic analyses of several properties of syllables (the rank-frequency distribution, the distribution of length, and the relation between length and frequency) in Serbian is presented. The syllabification algorithm used combines the maximum onset principle and the sonority hierarchy. Results indicate that syllables behave similarly to words as far as mathematical models are concerned, but values of parameters in models for syllables are quite different from those for words.... word, p. 367 for phrase, and pp. 432-433 for sentence). However, syllable seems to be more problematic than other units – here we do not face the problem of having to choose from among several established definitions (introduced by different linguistic schools), but the lack of a proper definition as ...
... approach – inevitably lead to results which are not comparable (at the very least not directly). Quantitative linguistics also suffers from this problem. Investigations on the level of syllables appear relatively rarely.9 In the situation described above, with a general syllable definition lacking ...
... of two adjacent monophthongs). Consonant clusters (especially in intervocalic positions) are the most problematic aspect of syllabification. The problem can be solved either empirically, with the help of native speakers (or, in a psycholinguistic research, relying fully on them), or by following s ...Marija Radojičić, Biljana Lazić, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Ján Mačutek, Lívia Leššová. "Frequency and Length of Syllables in Serbian" in Glottometrics (2019)
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A WebGIS Decision Support System for Management of Abandoned Mines
Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2016)... and maintained by the Faculty of Mining and Geology [12]. The user has the option to search the list of topics similar to the current problem, and report a new problem. It is necessary to define a title for the error, give a brief description and select one of the errors categories, e.g., error in the ...
... area in Vojvodina there are no mines of metal mineral resources, which usually have a more or less pronounced impact on the environment. Solving the problem of abandoned mines is also important for improvement of the environmental situation of wider areas, regardless of the degree of impact. There is ...
... suggestions for application upgrade, etc., while the screenshot with the error message can optionally be added. When an administrator solves the problem, an email is automatically sent to the user with the information that the error is corrected. 5. Conclusions In this paper we presented the results ...Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis. "A WebGIS Decision Support System for Management of Abandoned Mines" in Energies 7 no. 9 (2016): 567. https://doi.org/10.3390/en9070567
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Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention
Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol InjectionMilica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović. "Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention" in Underground Mining Engineering, Beograd : Rudarsko-geološki fakultet (2023)
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Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit
Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina. "Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit" in 9th International Conference Mining and Environmental protection MEP, 24 – 27 May 2023, Sokobanja, Serbia , Belgrade : University of Belgrade-Faculty of mining and geology (2023)
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GIS Application Improvement with Multilingual Lexical and Terminological Resources
... (Vitas et al., 2003). They include morphological e-dictionaries and finite state transducers, which offer the possibilities for solving the problem of flections in queries, and electronic thesauri, ontologies and wordnets which offer various possibilities for automatic or semi-automatic refinement ...
... compounds in Serbian, the development of a comprehensive dictionary of Serbian compounds is a tedious task. In the attempt to alleviate this problem, we have developed a procedure for automatic creation of lemmas for a given list of compounds (Stanković, 2008b). This procedure is based on rules ...Ranka Stanković, Ivan Obradović, Olivera Kitanović. "GIS Application Improvement with Multilingual Lexical and Terminological Resources" in Proceedings of the 5th International Conference on Language Resources and Evaluation, LREC 2010, Valetta, Malta, May 2010, Valetta, Malta : European Language Resources Association (2010)
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Dimenzionisanje deponija za ugalj
... potražnja za električnom strujom iz termoelektrana je najveća pa je ovo bitan parametar za dimenzionisanje deponije. Treća važan činilac su havarije i problemi izazvani prirodnim katastrofama (poplave, klizišta). Događaji iz maja i juna 2014.g. pokazali su da to može izazvati značajan poremećaj na elek ...
... učestvuju u određivanju veličine deponija uglja. U svetu se svakako o tome vodi računa. Sve u svemu, određivanje veličine deponije je kompleksan problem. U staroj SFRJ izrađen je predlog Pravilnika o administrativno-tehničkom određivanju veličine deponije [2]. Taj pravilnik nikada nije zaživeo, a ...Dinko Knežević, Božo Kolonja, Ranka Stanković, Aleksandra Tomašević, Dragana Nišić. "Dimenzionisanje deponija za ugalj" in Jedanaesta međunarodna konferencija o površinskoj eksploataciji OMC, 2014, Zlatibor, 15-18 oktoba 2014, Zlatibor : Jugoskovenski komitet za površinsku eksploataciju (2014)
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Development of integrated fuzzy model for mine management optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)... relative importance and triangular fuzzy numbers [3,5,11]4 Element identification serves to formulate a question for the expert who is examining the problem: “Is a criterion better for pairwise comparison in the matrix, and to what extent?” Proper matrix generation of all the criteria relative to a ...
... possible to determine exact numerical values for comparing, decisions. The proposed method makes use of a logical approach of the expert to create a problem hierarchy (objective > criteria > alternatives). A special application, Fuzzy-GQWOS, has been developed to facilitate decision making with a fuzzy ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of integrated fuzzy model for mine management optimization" in Comptes rendus de l'Académie Bulgare des Sciences (2023)
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Методологија интегралне анализе сценарија енергетског развоја
Александар Маџаревић (2019)енергетска безбедност, сценарио развоја, фази логика, сигурност снабдевања, доступност, расположивост, природни гас... природним гасом за потрошаче у Србији проблем високог приоритета. У 2011. години пуштено је у рад подземно складиште природног гаса Банатски Двор дневног капацитета од 5 милиона кубних метара (Министарство рударства и енергетике, 2013). Поред решавања проблема сезонских варијација у потрошњи, ПСГ пружа ...
... би се у будућности остварио жељени резултат. Стратешко планирање се у великој мери ослања на резултате анализе тренутног стања у оквиру посматраног проблема. Ово планирање пружа различите могућности пројектовања и постизање континуитета и конзистентности у разноврсним временским оквирима. Стратешко планирање ...
... кроз који је неопходно да се прилагођавање плана новим условима у окружењу обавља непрекидно (УНДП, 2010). Све горе наведено, доводи до тога да је проблем стратешког енергетског планирања, начелно предмет ове докторске дисертације, од виталног значаја за одрживи развој како држава, региона, локалних ...Александар Маџаревић. Методологија интегралне анализе сценарија енергетског развоја, Рударско-геолошки факултет, 2019
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Using Lexical Resources for Irony and Sarcasm Classification
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) ...... detection supervised machine learning and pattern matching techniques are used equally. Ma- chine learning looks at a problem of verbal irony detection as a binary classification problem with classes of ironic and non-ironic statements. In the paper [27] comparison of Naive Bayes (NB) and Decision Trees ...
... detection of verbal irony using rules of ontological reasoning in the Serbian WordNet (SWN) ontology. In Section 2 we present how irony detection problem was tackled in previous research. In many cases a corpus consisting of tweets was used, andwe have developed a similar resource for Serbian which we ...
... unification of language script, as the usage of Cyrillic and Latin scripts in Serbian is equal. All tweets were converted into Latin script. The second problem was the classification of tweets according to language. Although our principal aim was to obtain a collection of tweets in Serbian, due to the fact ...Miljana Mladenović, Cvetana Krstev, Jelena Mitrović, Ranka Stanković. "Using Lexical Resources for Irony and Sarcasm Classification" in Proceedings of the 8th Balkan Conference in Informatics (BCI '17), New York, NY, USA, : ACM (2017). https://doi.org/
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A Tel Platform Blending Academic And Entrepreneurial Knowledge
... affordable way "is a demanding task, which requires creativity and a significant amount of expertise. Designing for effective learning is a complex problem involving the design of learning tasks, learning resources and divisions of labor that enable each learner to learn effectively." [4] There is ...
... stage the students with tendencies/talent to share knowledge, and motivate them to work as teacher assistants (TA) and also publish their own problem examples as video tutorials. Finally, the platform will provide cost effective practical experience for the students through implementation of ...Ivan Obradović, Ranka Stanković, Jelena Prodanović, Olivera Kitanović. "A Tel Platform Blending Academic And Entrepreneurial Knowledge" in Proceedings of the The Fourth International Conference on e-Learning (eLearning-2013), September 2013, Belgrade, Serbia, Belgrade, Serbia : Belgrade Metropolitan University (2013)
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Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке
... gvozdeni artefakti (koji su najmagnetičniji i najlakše se detektuju ovom metodom). U nekim slučajevima, savremeni metalni ostaci predstavljaju veliki problem u magnetometrijskim ispitiva‐ njima, dok nekad, ako su oni cilj istraživanja, ovo predstavlja veliku prednost. Magnetometrijska ispitivanja arheoloških ...
... d streets), iron artefacts (which are the most magnetic and easiest detected by this method). In some cases, modern metal residues pose a major problem in magnetic investigations, while sometimes, if they are the goal of the research, this is a great advantage. Magnetic investigations of archae ...Весна Цветков, Илија Васиљевић, Бранислав Сретеновић, Весна Дамњановић. "Дефинисање археолошких објеката на локалитету Кремените њиве применом Ојлерове 3Д деконволуције на магнетометријске податке" in Књига апстраката 17. Конгрес геолога Србије, Врњачка Бања 17-20. мај, Српско геолошко друштво (2018)