Перегляд за автором "Petrova, R."

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  • Зображення мініатюри
    Публікація
    Analytical identification of the unmanned aerial vehicles' surfaces for the implementation at a 3D printer
    (PC «TECHNOLOGY CENTER», 2019) Petrova, R.; Sheyko, T.; Maksymenko-Sheyko, K.; Sirenko, V.; Morozova, A.
    Based on the R-functions theory, new approaches to analytical identification of drone surfaces for realization of 3D printing technology have been developed. The R-functions theory allows one to describe geometric objects of a complex shape with a single analytical expression, that is, obtain a mathematical model of the object in a form of an equation. To derive such equations, we used both the well-known standard primitive (sphere, ellipsoid, cylinder, cone, pyramid, etc.) procedure and a new approach, blending on a frame, which enables derivation of multiparameter equations with specified properties. Multiparameter equations of surfaces of drones of various types and purposes have been derived and visualized. Adequacy of the results to the designed objects was confirmed by visualization, both in conditions of operation of the RFPreview program and by realization on a 3D printer. The use of literal parameters when specifying geometric information in an analytical form makes it possible to promptly change size and shape of the designed objects which helps reduce time required to build computational models. The proposed method can reduce labor input in operation of CAD systems by months in cases when it is necessary to view a large number of design variants in a search for an optimal solution. Having the object equation, one can easily obtain equation of any of its sections which is useful for numerical calculations, namely, when building computational meshes. This can have a great effect on reducing complexity in construction of computational models for determining aero-gas-dynamic and strength characteristics. Characterization is also often associated with the need to account for changes in the aircraft shape. This leads to the fact that establishment of aerodynamic characteristics just because of the need to build a large number of computational models to account for this factor increases work duration by months. When specifying parameters, change of the rated operating conditions is made almost instantly.
  • Зображення мініатюри
    Публікація
    Impact of Globalization on Ukraine Economy
    (University of Turku, 2019) Sheiko, I.; Petrova, R.
    Integration of Ukraine into European and world economic, informational and social space allows to activate the flow of goods, investments, information, interpersonal communication. On the base of analysis the dynamics of globalization index of Ukraine, economic globalization has left the country only 89th in the world. Countries with more competitive economic structure receive the greatest benefit from globalization, leaving most of their global income inside. Thus, the activization of globalization and integration processes makes the issue of choosing the place and role of the national economy and its components in the world economic system relevant.
  • Зображення мініатюри
    Публікація
    Mathematical models and informational technologies of innovative project arrangement in the stakeholders’ system
    (НТУ «ХПІ», 2019) Petrova, R.; Liubicheva, O.; Morozova, A.
    During the involvement of innovative projects into knowledge-intensive high-tech enterprises, the process of creating a system of interested stakeholder management becomes vital. The given work contains the results of conducted analysis concerning the problem of innovative potential management of high-tech enterprises. The necessity of the analysis of informational technologies in the conditions of the non-equilibrium economy is considered. Various models of project management in the system of stakeholders are presented in the work. The stages of Nicholas model are considered. A mathematical model is proposed for the management and investors of the project, in terms of maximizing profits under specified constraints. При залученні інноваційного проекту в наукомісткі високотехнологічні підприємства актуальним процесом стає створення системи управління зацікавленими учасниками. Проведено аналіз проблеми управління інноваційним потенціалом наукомістких підприємств. Розглянуто необхідність аналізу інформаційних технологій в умовах нерівноважної економіки. Розглянуто різні моделі управління проектами в системі зацікавлених осіб. Розглянуто етапи використання моделі Ніколаса. Запропоновано математичну модель для керівництва та інвесторів проекту, в умовах максимізації прибутку при заданих обмеженнях.