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Упит dcterms_subject_txt:mahler measure

179 items

  • BERT Downstream Task Analysis: Named Entity Recognition in Serbian

    Milica Ikonić Nešić, Saša Petalinkar, Mihailo Škorić, Ranka Stanković (2024)
    This paper compares different architectures and techniques for preparing named entity recognition (NER) models for the Serbian language via integrating BERT with spaCy. Models were trained to recognize seven different named entity types (persons, locations, organisations, professions, events, demonyms, and artworks), and are trained on the dataset containing Serbian novels published between 1840 and 1920, publicly available newspaper articles and sentences generated from the Wikidata knowledge base and Leximirka lexical database. We explore various configurations and several training pipelines ...
    ... predictions, a custom metric named m-measure was calculated using the Eq. 1, and 3) the size of each pipeline was determined post-training, quantifying this in megabytes (MB). 10 Mlmeasuere = F * wps () The m-measure was introduced out of necessity to gain proper measure adjustment that was needed ...
    ... BE RT _m od el Xim-r-bertic 'SRoBERTA-F 6 39970 Bertic PO S + NE R PO S + Le mm a + NE R Fig.3. Heat map representing m-measure on the test set with yellow meaning better resu dark blue meaning worse results 1500 o l l ' Fig.4. Pipeline sizes in MB Bas eBE RT Du ...
    ... SRoBERTa-F + POS + Lemma + NER ELELALJ Bertic + NER. Bertic + POS + NER. Bertic + POS + Lemma + NER Impure Blood Poliltika Wikipedia Fig.7. M-measure heatmap on the evaluation test with yellow meaning better results, and dark blue meaning worse results 4 Conclusion In this research we trained ...

  • Evaluation And Perspectives Of Underground Coal Mines In Serbia

    Vladimir Milisavljević, Milena Lekić, Ivica Ristović, Vojin Čokorilo, Aleksandar Cvjetić (2017)

  • 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

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... induction to measure flow. When a fluid passes through an electromagnetic field, an electromotive force is generated that is proportional to the flow rate. These sensors are suitable for measuring conductive fluids. Figure5.6 Electromagnetic sensors 4.Capacitive sensors – These measure changes in ...
    ... sensors - Measure temperature without contact by detecting infrared rays emitted by an object. They detect infrared radiation and convert it into an electrical signal that represents the object's temperature. Infrared sensors are useful in situations where it is difficult or impossible to measure temperature ...
    ... sensors allow for timely detection of abnormal pressures that may indicate malfunctions or inefficiencies in the pumps. Their ability to accurately measure pressure ensures proper monitoring and maintenance of the system, preventing potential issues and enhancing the reliability and performance of ...

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... region, defines the mini- mum mass fraction of surfactant needed to solubilize water and oil and is a measure for the efficiency of the surfactant. The corresponding temperature, f, is a measure for the phase inversion temperature (//7). The phase diagrams were recorded by success- ively adding ...
    ... nonionic surfactanUwater/oil microemulsions are very interesting scientifically and technically. A convenient way to study these systems is to measure the phase behavior at constant oil/water ratios as a function of temperature, 7, and surfactant . mass fraction, ». Correspondence: M. Ilić ...

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilić, Franz-Hubert Haegel, Vesna Pavelkić, Dragan Zlatanović, Snežana Nikolić-Mandić, Aleksandar Lolić, Zoran Nedić (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    mikroemulzija, toluen, alkil poliglukozid oksoalkohol etoksilat, pojačivač efikasnosti, dijagrami “ribe”

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    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 ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri

  • Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology

    Mihailo Škorić, Mauro Dragoni (2019)
    This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...
    document classification, MeSH, ontology, information extraction

  • Results of comprehensive monitoring activities on Umka landslide, Belgrade, Serbia

    Biljana Abolmasov, Uroš Đurić (2021)
    klizišta, monitoring

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi – criteria optimization

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    višekriterijumska optimizacija, definisanje kriterijuma, podzemna eksploatacija

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names

  • 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

  • Results of Recent Monitoring Activities on Landslide Umka, Belgrade, Serbia—IPL 181

    Biljana Abolmasov, Uroš Đurić, Jovan Popović, Marko Pejić, Mileva Samardžić Petrović, Nenad Brodić (2021)
    Klizišta, Monitoring, GNSS, Geodetska osmatranja, UAV snimci, PSInSAR

  • Semantic Textual Similarity of Courses Based on Text Embeddings

    Olivera Kitanović, Aleksandra Tomašević, Mihailo Škorić, Ranka Stanković, Ljiljana Kolonja (2024)
    This paper explores the application of textual embeddings to measure semantic similarity between educational courses’ curriculums, aiming to enhance the effectiveness of the next faculty accreditation. Leveraging state-of-the-art natural language processing techniques, we employ pre-trained embeddings to capture the semantic meaning of course descriptions. Our methodology involves transforming course curriculum texts into high-dimensional vector representations, enabling efficient and meaningful comparisons. We evaluate the proposed approach on a diverse dataset of course descriptions, employing established benchmarks for semantic textual similarity ...
    ... Đušina 7, Belgrade, Serbia {olivera.kitanovic,ranka.stankovic}argf.bg.ac.rs Abstract. This paper explores the application of textual embeddings to measure semantic similarity between educational courses' curriculums, aiming to enhance the effectiveness of the next faculty accreditation. Leveraging ...
    ... select a predefined number (in our case study 5) of other courses with the highest similarity. Generally, additional threshold value for similarity measure can be set, but for the evaluation purposes in this case study it was not applied. 318 O. Kitanović et al. 0,954 0,958 0,953 0,928 0,917 0 ...

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation
    ... who were considered irrelevant during the evaluation stage. Figure 4 shows precision, recall and the F measure for this test query set. Based on the calculated measures (precision, recall and F-measure) (Figure 4), it can be concluded that precision for most queries is satisfactory, except for keywords ...
    ... keywords homogenizacija and kola�c, as both words are semantically ambiguous. Recall that the F-measure are very low in case of queries without expansion, while the figures show superior results with query expansion compared to original queries. The recall for the query homogenizacija does not extract all documents ...
    ... (2) 40 (1) 64 (4) 75 (8) 71 ukrupnjavanje 1 (0) 1 (0) 2 (0) 45 (5) 45 separacija 5 (1) 3 (1) 17 (4) 76 (14) 72 Figure 4. Precision, recall and F-measure for the test query set Managing mining project documentation 1003 rudnik (mine) is used, while sometimes the adjective površinski before the ...

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods
    ... In the next step the value of the objective function is computed for each individual in the population, and on the basis of this value the fitness measure of each individual is found. Pairs of individuals with highest fitness values are selected and their descendants are created, inheriting in their genetic ...
    ... of the genotype. The objective function is the function being optimized, i.e. the function whose minimum or maximum is required. The feasibility measure, i.e. the fitness of an individual demonstrates, in the optimization case, how well that individual, i.e. the solution represented by the chromosome ...

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike
    ... (100/CN) R ((Rij – ,R.)/ ,R.)2 where CN is coordination number and ,R. is the average bond distance for the polyhedron (Brown & Shannon 1973). It is a measure of dispersion of the individual bond lengths, i.e., a large D indicates dispersed bonds, while low values indicate that the bonds are closely grouped ...
    ... (100/CN) 2 (Ry — )/ )° where CN is coordination number and is the average bond distance for the polyhedron (Brown & Shannon 1973). It is a measure of dispersion of the individual bond lengths, i.e., a large A indicates dispersed bonds, while low values indicate that the bonds are closely grouped ...
    ... ideal and real polyhedral volumes with the same circumscribed sphere radius. The volume discrepancy between Vi and Vr was used as a quantitative measure of polyhedral distortion. The volume-based eccentricity is defined as ECCV¼ 1 – [(rS – d)/rS] 3, where d is the distance between the center of the ...