Перегляд за автором "Lesna, N."

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  • Зображення мініатюри
    Публікація
    Research of methods to support data migration between relational and document data storage models
    (ХНУРЕ, 2022) Peretiatko, M.; Shirokopetleva, M.; Lesna, N.
    The subject matter of the article is heterogeneous model-inhomogeneous data migration between relational and document-oriented data storage models, existing strategies and methods to support such migrations, the use of relational algebra and set theory in the context of databases in building a new data migration algorithm. The goal of the work is to consider the features and procedure of data migration, explore methods to support data migration between relational and documentary data models, build a mathematical model and algorithm for data migration. The following methods were used: analysis and comparison of existing approaches to data migration, choice of strategy for further use in compiling the migration algorithm, mathematical modeling of the algorithm of heterogeneous model-inhomogeneous data migration, formalization of the data migration algorithm. The following tasks were solved in the article: consideration of the concept and types of data migration, justification for choosing a document-oriented data model as a target for data migration, analysis of existing literature sources on methods and strategies of heterogeneous model data migration from relational to document-oriented data model, highlighting advantages and disadvantages existing methods, choosing an approach to the formation of the data migration algorithm, compiling and describing a mathematical model of data migration using relational algebra and set theory, presentation of the data migration algorithm, which is based on the focus on data queries. The following results were obtained: the possibilities of relational algebra and set theory in the context of data models and queries are used, as well as in model redesign, the strategy of migration of data models is chosen, which provides relational and document-oriented data models, the algorithm of application of this method is described. Conclusions: because of the work, the main methods of migration support for different data storage models are analyzed, with the help of relational algebra, set theory a mathematical model is built, and an algorithm for transforming a relational data model into a document-oriented data model is taken into account. The obtained algorithm is suitable for use in real examples, and is the subject of further research and possible improvements, analysis of efficiency in comparison with other methods.
  • Зображення мініатюри
    Публікація
    System for sharpness evaluation of photos of people
    (ФОП Петров В.В., 2022) Dolhanenko, O.; Shirokopetleva, M.; Lesna, N.
    Evaluating the sharpness of an image is an important step in image processing and image quality assessment. It allows to classify images based on their overall sharpness, which can help professionals do the work of image editing faster
  • Зображення мініатюри
    Публікація
    The Set of Manuals for Accounting Credits for Courses and Projects
    (Kharkov State Technical University of Radio Electronics, 2000) Філатов, В. О.; Захарченко, В. Ф.; Лесная, Н. С.; Filatov, V. O.; Zaharchenko, V.; Lesna, N.
    The present guide comes out of work within the bounds of TEMPUS UM_CP-20560-1999 project on investigating of International European Higher Educational System, based on EUROPEAN CREDIT TRANSFER SYSTEM (ECTS). The authors of this guide made it their aim: - Ukrainian user’s, from decane to student level, acquaintance with the International European Higher Educational System based on ECTS in view of multi-stage studying in the educational institutions of the European Union; - providing the reader the information about main concepts of educational process management by the example of Kharkov State Technical University of Radio Electronics, and its differences from the European Educational System; - elaboration of the requirements for informational and methodical-organizational support of the higher educational institution faculty on introduction the ECTS model into the educational process (by the example of Computer Science faculty); - acquaintance of the Ukrainian user with particular features of the ECTS Information Package.
  • Зображення мініатюри
    Публікація
    XML Applications for study material markup in distance learning
    (ХНУРЭ, 2004) Lesna, N.; Repka, V.; Sakalo, T.
    The presented paper was written as a consequence of growing need for properly designed distance learning implementation. Scalable and exhaustive tool for description of learning materials was supposed to be a final result of this work. For this purpose, was researched the current situation in the area of markup techniques. The obvious conclusion was made that a special markup language definition is necessary to reach the given goals. This conclusion was also addressed within this research and the document type definition suitable for the given goals was designed. The proposed solution is based on the analysis of strengths and weaknesses of existing markup languages purposed for distance learning needs.