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Упит dcterms_subject_txt:economical evaluation

354 items

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... D. Fuzzy approach to dependability performance evaluation. Qual. Reliab. Eng. Int. 2008, 24, 779–792. [CrossRef] 27. Tanasijevic, M.; Jovancic, P.; Ivezic, D.; Bugaric, U.; Djuric, R. A fuzzy-based decision support model for effectiveness evaluation—A case study of examination of bulldozers. Int. ...
    ... common goals: the identification of critical elements in the system, subsystems, and assemblies; the assessment of regular failure occurrences; the evaluation of the level of risk and measures that should be taken for a system to retain its designed functional characteristics. The initial idea for this ...
    ... assessment for a subsystem of the mobile crushing machine are shown in Table 13 and Figure 14, and they represent the results of a comprehensive evaluation based on the failure risk of the elements of each individual subsystem. Figure 13. Fuzzy set for a failure risk assessment of the “electrical” ...

  • 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 ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... M.; Ignjatovic, D. Fuzzy Approach to Dependability Performance Evaluation. Qual. Reliab. Eng. Int. 2008, 24, 779–792. [CrossRef] 13. Tanasijevic, M.; Ivezic, D.; Jovancic, P.; Catic, D.; Zlatanovic, D. Study of Dependability Evaluation for Multi-hierarchical Systems Based on Max–Min Composition. Qual ...
    ... model for evaluation of mining machinery. In Proceedings of the 48th International October Conference on Mining and Metallurgy, Bor, Serbia, 28 September–1 October 2016; pp. 15–18. 20. Ivezic, D.; Tanasijevic, M.; Jovancic, P.; Djuric, R. A Fuzzy Expert Model for Availability Evaluation. In Proceedings ...
    ... and that it decreases with the age of the machine (A(BN) > A(BO)). The following are the calculations of availability, based on the opinion and evaluation of experts, using the two methods mentioned above, fuzzy and AHP. Expert opinion was formed for each of the three types of machines, in a comparative ...

  • Towards the semantic annotation of SR-ELEXIS corpus: Insights into Multiword Expressions and Named Entities

    Cvetana Krstev, Ranka Stanković, Aleksandra Marković, Teodora Mihajlov (2024)
    Овај рад представља активности на развоју корпуса ELEXIS-sr, српском додатку вишејезичном анотираном корпусу ELEXIS-а, који се састоји од семантичких анотација и репозиторија значења речи. ELEXIS је паралелни вишејезични анотирани корпус на десет европских језика, који може да се користи као вишејезички репер за евалуацију европских језика са мање и средње развијеним ресурсима. Фокус овог рада је на вишечланим изразима и именованим ентитетима, њиховом препознавању у скупу реченица ELEXIS-sr и поређењу са анотацијама на другим језицима. Разматрају се први кораци ...
    полилексемске језинице, именовани ентитет, вишезначност значења речи, складиште смисла, LLOD

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci
    ... mineralnih sirovina’ (mineral resource exploitation—228), ‘efekat staklene bašte’ (greenhouse effect—109). Appl. Sci. 2021, 11, 2892 10 of 22 Evaluation follows, where the following is checked: is the extracted candidate a terminological phrase, which domain (mining, technical, etc.) and possibly ...
    ... subdomain it belongs to. If the domain or subdomain are identified, the appropriate semantic markers are assigned to the terminological phrase. After the evaluation process, all correctly evaluated terminological phrases were prepared for insertion into the terminological database Termi. 3.4. Adding Bilingual ...
    ... (telephone network), ‘deponija’ (deposit), ‘oblik poklopca’ (shape of the cover), . . . A wider set of terms will be evaluated in the near future. For evaluation of bilingual candidates, besides frequencies for single terms, we have also used a heuristic for evaluating terminological phrases based on the following ...

  • Application of a Method for Intelligent Multi-Criteria Analysis of the Environmental Impact of Tailing Ponds in Northern Kosovo and Metohija

    Gordana Milentijević, Blagoje Nedeljković, Milena Lekić, Zoran Nikić, Ivica Ristović, Jelena Đokić (2016)
    flotacijska jalovišta, životna sredina, višekriterijumska analiza, ekologija, Trepča
    ... ranking of tailing on the local environment, AHP (Analytic Hierarchy Process) and PROMETHEE (Preference Ranking Organization Method for Enrichment Evaluation) are used in this paper. The consideration and description of these two methods from a mathematical aspect is presented briefly considering that ...
    ... the CR, the consistency index (CI) should be calculated according to Equation (3): CI = λmax − n n − 1 (3) where λmax is maximum value of the evaluation matrix. The closer λmax is to the number of alternatives (n), the less inconsistency there is. λmax is calculated by Equation (4): λmax = 1 n n ...
    ... other alternatives, however, means further domination over another alternative aj in the system of alternatives. As a measure for multi-criteria evaluation, the PROMETHEE II involves absolute flow: φj ( aj ) = φ+ j ( aj ) −φ− j ( aj ) ; j = 1, . . . , J where j is the number of alternative ...

  • Hidrogeotermalni resursi teritorije grada Beograda

    Ana Vranješ (2012-12-12)
    Republika Srbija je izrazito bogata hidrogeotermalnim resursima. Podzemne vode satemperaturama preko 20oC (pa do 96oC, Vranjska Banja) relativno su dobro iskorišćene.Nasuprot njima, podzemne vode sa temperaturama do 20oC do sada uglavnom nisu bilepredmet istraživanja sa bilo kog aspekta izuzev za potrebe vodosnabdevanja. Razvojemsistema toplotnih pumpi, mogućnosti višenamenskog korišćenja ovih voda značajno suuvećane.Teritorija Beograda odlikuje se značajnim resursima podzemnih voda, pre svega u okvirualuvijalnih peskovito-šljunkovitih naslaga i neogenih tortonsko-sarmatskih krečnjačkihnaslaga. Temperatura ovih voda ne prelazi 25oC. Njihovim zahvatanjem preko istražnoeksploatacionihbunara ...
    geotermalna energija, hidrogeotermalni resursi, hidrogeotermalni sistemi, hidrogeotermalnapotencijalnost, energetska valorizacija, hidrogeološka rejonizacija, grad Beograd

  • Paleomagnetic evidence for post-collisional Miocene clockwise rotation in the Serbian segment of the Vardar Zone and the Danubicum

    Vesna Lesić, Emő Márton, Vesna Cvetkov, Dragana Tomić (2015)

  • An Approach to Development of Bilingual Lexical Resources

    Stanković Ranka, Obradović Ivan, Trtovac Aleksandra (2012)
    ... of e-journals, or more precisely, textual resources representing collections of TMX documents with corresponding metadata. For testing and evaluation of Bibliša we used a bilingual Serbian- English scientific journal, INFOtheca (http://infoteka.bg.ac.rs), covering the field of Library and I ...
    ... Sharing Infrastructure: Principles, Challenges, Solutions. In: Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC), (Istanbul, Turkey, May 23-25, 2012). [7] Stanković, R., Obradović, I., Krstev, C., Vitas, D. 2011. Production of Morphological Dictionaries ...
    ... Enhanced Search of Multilingual Digital Libraries of E- journals. In: Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC), (Istanbul, Turkey, May 23-25, 2012). [9] TMX 1.4b Specification. 2005. http://www.gala- global.org/oscarStandards/tmx/tmx14b.html ...

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    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 ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Analiza primene višekriterijumskih metoda u optimizaciji izbora hidruličnih bagera na površinskim kopovima uglja

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Filip Miletić, Ivan Janković (2019)
    Hidraulični bageri primenjuju se u različitim oblastima privrede a najzastupljeniji su u građevinarstvu i rudarstvu. Na površinskim kopovima sa kontinualnim sistemima, klasifikuju kao pomoćna mehanizacija a na površinskim kopovima sa diskontinualnim sistemima, kao osnovna mehanizacija. Kako je u oba slučaja njihova primena neizostavna, važno je izvršiti adekvatnu analizu postojećih podataka, u cilju optimizacije izbora tipa hidrauličnog bagera u odnosu na uslove rada datog površinskog kopa. U radu su opisane različite višekriterijumske metode koje su korišćene za analizu hidrauličnih bagera. ...
    višekriterijumske metode, površinski kop uglja, pomoćna mehanizacija, hidraulični bager
    ... su:  AHP - Analytical Hierarchy Process [8], Thomas L. Saaty  PROMETHEE (I, II) - Preference ranking orga- nization method for enrichment evaluation [9], Jean-Pierre Barns  TOPSIS - Technique for Order of Preference by Similarity to Ideal Solution [10], Ching-Lai Hwang  VIKOR - VIse ...
    ... hidrauličnih bagera. Korišćene su: metoda AHP (Analytical Hierarchy Process), PROMETHEE (Prefe- rence ranking organization method for enrichment evaluation), TOPSIS (Technique for Order of Prefe- rence by Similarity to Ideal Solution), VIKOR (Multi- criteria Optimization and Compromise Solution) i ELECTRE ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... function is used. The four percentiles were computed for different key values, but final results will be deduced after a broader evaluation campaign, with parallel evaluation and adequate interrater agreement. For the greylist function only two key values are used (5th and 95th percentiles): values lower ...
    ... state-of-the-art neural network architectures. Another future step is the model’s evaluation on a control dataset – extraction and ranking performance is going to be tested by more lexicographers, with parallel evaluation and interrater agreement checking. Finally, we also plan to introduce flexible ...
    ... a numerical weight (priority) is assigned to it (the sum of all weights being 1), which gave us better results. The precision calculated on the evaluation set for the first 100 ranked examples was 0.77, for the first 200 it was 0.70, for 400 it was 0.65, for 1,000 it was 0.6, etc. We believe that ...

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • An Efficient Class of Iterative Root-Finding Methods with Applications

    Dejan Ćebić, Nebojša Ralević (2021)

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Clockwise rotation in the Serbian segment of the Vardar zone and in the Danubicum of Eastern Serbia - tetonic implication

    Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Tomić (2015)

  • A multi-criteria approach for assessing the potential of renewable energy sources for electricity generation: Case Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    When assessing the potential of renewable energy alternatives for electricity generation, it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values of energy indicators and expert judgments. The use of a fuzzy numerical value scale for the assessment of expert judgments and energy indicators provides a more sensitive ...
    Proizvodnja električne energije, Obnovljivi izvori energije, Višekriterijumsko odlučivanje, Srbija
    ... it is necessary to implement a multi-perspective approach that includes economic, technical, environmental, and socio-political criteria. For the evaluation of criteria and alternatives, the Fuzzy Analytical Hierarchy Process (FAHP) method is applied. The obtained weights are formed according to the values ...
    ... increase in the share of renewables in electricity generation. Such results need to be interpretated together with data served as an input for the evaluation. The main difficulty identified in conducting this research was the limited availability of updated information. At the moment, Serbia’s strategic ...
    ... research is multidimensional coupled with the lack of information, so it is not feasible to conduct analysis using a method limited exclusively to the evaluation of energy indicators without multi- criteria decision-making methodology. This approach could be useful as a starting point in the process of developing ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... Belgrade, Serbia Original scientific paper DOI:10.2298/TSCI160923303P There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing ...
    ... their interactions and specific importance to availability performance. The proposed procedure for availability indicator determination and their evaluation by AHP is implemented for deter- mination of availability – as a dimension of energy security in Serbia. Concept and dimensions of energy security ...
    ... individually within a dimension of availability helps in defining of priority actions and creation of adequate policy instruments and measures. For evaluation the availability of energy in Serbia, proposed sets of indicators were calculated and AHP method was implemented for prioritization of availability ...

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... models, text classification, and name entity recognition. All of them combine textual and video lectures with quizzes and assignments for self-evaluation. There are also courses in Italian related to NLP 8 , such as the course “Linguaggio Naturale” by Francesco Cutugno from Universita di ...
    ... developed in order to enable higher education (HE) institutions to publish their course materials (video lectures, course planning materials and evaluation tools as well as thematic content).The ICT solution includes several components:  OER repository on local edX platform (http://edx.baektel ...
    ... The course consisting of 11 lessons comprises textual and multimedia educational resources accompanied with quizzes and assignments for self evaluation. The material is organized as follows: 1. The brief overview of approaches and methods used in CL and NLP. Special attention is given ...

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... ske jednačine” or “diferencijalno-algebarskih jednačina”, as well as all other forms generated by the transducer (local grammar) NC_2XAXN. Evaluation and filtering of all terms is underway, in order to generate candidate MWEs to be entered into the morphological dictionary. Serbian WordNet ...
    ... mathematical terms. Further plans will tackle additional integration, development and testing of lexical tools and engines in MLES. Detailed evaluation of the entire system is planned, which will provide directions for further improvement of MLES. REFERENCES [1] Vitas D., Popović Lj., ...
    ... enhanced search of multilingual digital libraries of e-journals. Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC), pp. 1710- 1717. [11] Krstev, C., (2008). Processing of Serbian. Automata, Texts and Electronic Dictionaries Search Engine. Faculty ...

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... ESBERT R. M. (2007) Alteration of granite stone used in building construction. Materiales de Construcción, 57, pp. 77–89. FAVARO M. et al. (2006) Evaluation of polymers for conservation treatments of outdoor exposed stone monuments, Part I. Photo-oxidative weathering. Polymer Degradation and Stability ...
    ... Introduction to interval analysis. Philadelphia: Society for Industrial and Applied Mathematics. MYRIN M. and MALAGA K. (2006) A case study on the evaluation of consolidation treatment of Gotland sandstone by use of ultrasound pulse velocity measurements. In: Heritage, weathering and conservation. ...
    ... procedures, Quarterly Journal of Engineering Geology and Hydrogeology, 29, pp. 299–308. VASANELLI E. et al. (2015) Ultrasonic pulse velocity for the evaluation of physical and mechanical properties of a highly porous building limestone. Ultrasonics, 60, pp. 33 – 40. YAVUZ H. et al. (2006) Estimating ...