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639 items

  • Advantages and challenges in presenting mathematical content using EDX platform

    Marija Radojičić, Ivan Obradović, Ranka Stanković, Olivera Kitanović, Roberto Linzalone (2016)
    ... export link to a term, which can be embedded in an html page. This provides for establishing a connection between a term within the course and its definition in Termi dictionary. From the user’s point of view this addition to mathematical content within the course can be very useful as some kind ...
    ... educators, students and self- learners to use and reuse for teaching, learning and research [1]. OERs have been used for different topics and they can be in various forms from simple texts, pictures and videos to entire courses. In this paper we discuss OERs related to Mathematics in Serbian ...
    ... All over the world there are lot of mathematical OERs and many of them are presented through Massive Online Open Courses (MOOCs). Among MOOCs we can distinguish cMOOCs, which are decentralised, network- based, with non-linear structure, and xMOOCs, where courses are hyper-centralised, content-based ...

  • Sustainable transition of district heating systems in Serbia, or can engineers do it alone?

    Ivezić Dejan, Živković Marija (2018)

  • Keyword-Based Search on Bilingual Digital Libraries

    Ranka Stanković, Cvetana Krstev, Duško Vitas, Nikola Vulović, Olivera Kitanović (2017)
    This paper outlines the main features of Biblisha, a tool that offers various possibilities of enhancing queries submitted to large collections of aligned parallel text residing in bilingual digital library. Biblishsa supports keyword queries as an intuitive way of specifying information needs. The keyword queries initiated, in Serbian or English, can be expanded, both semantically, morphologically and in other language, using different supporting monolingual and bilingual resources. Terminological and lexical resources are of various types, such as wordnets, electronic ...

  • An aproach to Implementation of blended learning in a university setting

    Ivan Obradović, Ranka Stanković, Olivera Kitanović, Jelena Prodanović (2011)
    ... its specific permissions. Besides the administrator, the two most important are the teacher, who can edit and modify the course content and monitor student activities, and the student, who can access the course content, perform different activities proposed, and view his/her own results. ...
    ... users, akin to an internal e-mailing system. Finally, Moodle offers several types of reports that can be divided into two groups: global reports and reports at the course level. Global reports can be used for a systematic insight in both system parameters of the Moodle platform and data related ...
    ... the archive status. For each course the administrators can define the number of most recent copies to be kept by Moodle, and set copies of the backup report to be sent by e-mail. More details on Moodle and its application in practice can be found in [4]. Figure 3. Number of visits ...

  • A Lexical Approach to Acronyms and their Definitions

    Cvetana Krstev, Duško Vitas, Ranka Stanković (2015)
    In this paper we present a comprehensive approach to acronyms for Natural-Language Processing (NLP) of Serbian texts. The proposed procedure includes extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain information. This approach enables representation that reflects complex relations between acronyms and their definitions.
    ... an entity and its name and acronym is not one-to-one. The name can change in time and some shortened variants can be in use, translated names can exhibit serious variations in used lexica and syntactic forms, original acronyms can be trans- lated (ILO – International Labour Organization vs. MOR ...
    ... a majority of them is never lexicalized, either be- cause of the limited scope of their use or because they can- not be pronounced or used as other words of the language. These new words can pose severe problems to many NLP applications because they represent the unknown words for them: applications ...
    ... Council vs. VBC – Svetski bokserski savez), a pronounced acronym can be used to- gether with the original and translated name (Bi-Bi-Si for BBC – British Broadcasting Corporation – Britanska ra- diodifuzna korporacija). Thus, this relation can rather be represented as a network of complex object (see Fig ...

  • Debris-flow Susceptibility Assessment in Flow-R: Ribnica River Case Study

    Ksenija Micić, Miloš Marjanović, Biljana Abolmasov (2024)
    Debris flows are among the most dangerous erosional geohazards due to the fast rate of movement and long runout zones. Even though the initiation can be triggered in mountainous areas, inhabited and with steep slopes, their propagation and deposition can endanger not only buildings and infrastructure in the urbanized areas, but also threaten human lives. As these initiation areas usually represent unattainable terrains with rapid vegetation cover development, field observations and aerial photo analysis become high-demanding tasks. Consequently, medium-to-regional ...
    tečenje drobine, Flow-R, procena podložnosti, empirijski model

  • INVENTS: A Hybrid Mine Ventilation Planning and Design System

    Lilić Nikola, Stanković Ranka, Obradović Ivan (2013)
    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 ...
    hybrid systems, mine ventilation, expert systems
    ... standard C code. In the KAPPA-PC system, the components of the domain are represented by objects that can be either classes or instances within classes (Fig.9). The relationships among the objects in a model can be represented by linking them together into a hierarchical structure. Thus the modified OOA model ...
    ... Belgrade Abstract: 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 ...
    ... Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In contemporary mining practice extensive ...

  • INVENTS: a hybrid system for subsurface ventilation analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (2000)
    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 ...
    ... standard C code. In the KAPPA-PC system, the components of the domain are represented by objects that can be either classes or instances within classes (Fig.9). The relationships among the objects in a model can be represented by linking them together into a hierarchical structure. Thus the modified OOA model ...
    ... Belgrade Abstract: 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 ...
    ... Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In contemporary mining practice extensive ...

  • Introductory editorial - Special issue: Genesis and protection of groundwater in carbonate aquifer

    Saša Milanović (2019)
    Geochemistry and Petrology

  • Can elevated uranium concentrations in groundwater be predicted?

    Marina Ćuk, Petar Papić, Igor Jemcov (2017)

  • A WordNet Ontology in Improving Searches of Digital Dialect Dictionary

    Miljana Mladenović, Ranka Stanković, Cvetana Krstev (2017)
    In this paper, we present a method for automatic generation of a digital resource, which connects all indirect synonyms of a dialect term to all indirect synonyms of a corresponding term in the standard language, aiming to improve the search of a digital dialect dictionary. The method uses SWRL rules defined in the Serbian WordNet ontology to identify sets of synonymous words. It also uses e-dictionaries to produce correct lemmas in standard language that users usually employ in searches. ...
    ... digital dialect dictionaries The challenging task of digitizing a dialect dictionary can be solved in different ways considering software platform, database storage, search framework and additional management tools. It can be a Web application that uses relational databases, like Oracle used for storing ...
    ... information. For example, the retrieval of information in EDD can be limited to the structural units in the entries (heads, definitions, citations, comments, variants, etc.), while logical filters combining basic Boolean operators and metadata can be used for advanced search options. Similar techniques are ...
    ... or similar meaning in a given context. Synsets respect the syntactic categories noun, verb, adjective, and adverb and can be interconnected by semantic relations, while word forms can be connected by lexical relations. In SWN ontology there are currently 2,243 verb synsets defined as ontology individuals ...

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... simulator and design tool. With RODSTAR you can design new rod pumping installations or make changes to existing rod pumping systems. It is a tool that you can use to compare pumping units, pumping speeds, plunger sizes, rods, motor types, etc. You can evaluate the effect of pump fillage, fluid ...
    ... t stretching and expansion stresses, which can lead to increased 19 fluid slippage between the cylinder and the piston, directly reducing the pump's operational efficiency. [5] Bottom Seating If the seating is done at the bottom end, the pump can be installed at greater depths (for deep ...
    ... wave equation. Therefore, the effects of various pumping unit types can be studied. QRod also has this capability, but the pumping unit choices are generic by type, as opposed to being unit- specific. Other information that can be determined using the RODSTAR, SROD, and AccuPump Beam programs ...

  • Fragmentation Size Prediction of Blasted Material Using a Specialized Software for Drilling and Blasting

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić, Miljan Gomilanović (2024)
    Design and optimizing the drilling and blasting parameters, should fill the requirements for the capacity, fragmentation size, and technical characteristics of loading and transport equipment, and enable a safe work at the open pit. Besides mentioned, it also achieves the minimal impact on the environment of the open pit and decreases the negative effects on the environment, especially in the blast vibration and flyrock. To obtain the best possible blasting effects and consider all the factors, a specialized software is ...
    optimization, O-Pitblast, drilling, blasting, fragmentation size

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović (2024)
    During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...
    expansive mortar, artificial screens, pressure, rock breaking, building foundation

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • A Tool for Enhanced Search of Multilingual Digital Libraries of E-journals

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Aleksandra Trtovac, Miloš Utvić (2012)
    This paper outlines the main features of Bibliša, a tool that offers various possibilities of enhancing queries submitted to large collections of TMX documents generated from aligned parallel articles residing in multilingual digital libraries of e-journals. The queries initiated by a simple or multiword keyword, in Serbian or English, can be expanded by Bibliša, both semantically and morphologically, using different supporting monolingual and multilingual resources, such as wordnets and electronic dictionaries. The tool operates within a complex system composed ...
    multilingual digital libraries, query expansion, TMX
    ... detail in Section 2. When performing such a search the user can make use of a form with predefined fields for the most commonly used data: author’s name, words from an article title, year of publication, and article keywords. The search can be performed either in the English or the Serbian part of ...
    ... parallel articles residing in multilingual digital libraries of e-journals. The queries initiated by a simple or multiword keyword, in Serbian or English, can be expanded by Bibliša, both semantically and morphologically, using different supporting monolingual and multilingual resources, such as wordnets and ...
    ... texts, which enable users to compose queries both with simple and multiword keywords in more than one language. In addition to that, user queries can be expanded, both semantically and morphologically, the latter being very important in highly inflective languages, such as Serbian. Open access ...

  • 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
    ... indicators have the same form. Values j can be an hour, a moto hour, etc., depending on the analyzed indicator. Regarding the number of linguistic variables, it can be found that seven is the maximal number of rationally recognizable expressions that human can simultaneously identify [8]. Therefore ...
    ... Additional nine outcomes can be separated for Ω = 2, and MIN value can be determined for each of those. Further on, maximal value (5) is identified among mentioned minimal values, MAX (MINΩ = 2) = 0.11. In the same way, other outcomes are calculated. All these outcomes can be grouped around sizes ...
    ... shut down. The availability can be calculated by the time coefficient, which includes mention time state. For time state tracking, specific IT structure is necessary. Such structure is often very expensive and unavailable. An alternative is the expert system, which can absorb partial indicators ...

  • Simple 2D Gravity-density inversion for modeling of the sedimentary basin basement

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić, (2019)

  • Long-term rockslope monitoring and rockfall prediction

    Miloš Marjanović, Biljana Abolmasov, Marko Pejić, Jelka Krušić (2021)