Кафедра цифрових освітніх технологій
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Item type:Наукова стаття, Strength and mechanical characteristics of modified polyurethane foams(2024) Mikulich, Olena; Hulay, Olga; Furs, Tetiana; Shemet, VasylynaThe article is devoted to studying the influence of the polymer modifier on the mechanical characteristics of polyurethane foams under typical technologies and conditions of foam production. As a modifying component, siloxane rubber additives with high elasticity were chosen. The microstructure of the obtained foams was analyzed and the process of deformation of the samples during compression was investigated. The results of experimental studies for different cases of partial ratios of foam components showed that the proportion of siloxane rubber additives significantly affects not only the mechanical and strength characteristics of foam materials but also their microstructure. An increase in the proportion of the modifier, along with an increase in strength and mechanical characteristics, leads to a decrease in the plastic characteristics of foams and an increase in the proportion of open pores in the material. The approaches described in the work can be used to produce structural elements from foam materials with predetermined characteristics.Item type:Наукова стаття, Digital psychological support for students under martial law using a chatbot, as an analog of signal filtering in communication systems(2025-11-10) Kabak, Vitalii; Hulai, Olha; Zenkova, Claudia Y.; Angelsky, Oleg V.The article analyses modern approaches to the creation of chatbots and their use in the field of psychology and education. The main problems that arise in this area are identified, in particular, the need to ensure confidentiality, adaptation to the emotional state of users and integration with external information systems. A prototype of a chatbot for psychological support of higher education students has been created. The use of the GPT model is proposed to ensure the accuracy and adaptability of interaction. The OpenAI platform with the MyGPTs function was chosen, which allowed the chatbot to be adapted to the needs of users by downloading methodological materials and instructions. The chatbot was tested on real-life scenarios. Chatbot functions as a signal filter-similar to physical filters in communication systems. A survey among higher education students confirmed that the developed bot meets the requirements of modern digital solutions in psychological support, provides prompt feedback and creates a sense of emotional support. The results of the study can serve as a basis for further improvement of the chatbot and integration of additional features such as voice responses and interactive exercises.Item type:Наукова стаття, Specified Parameters in Designing Porous Materials Using Magnetic Nanotechnologies(Sumy: Sumy State University, 2023) Riabchykov, Mykola; Furs, Tetiana; Alexandrov, Alexandr; Tsykhanovska, Iryna; Hulai, Olha; Shemet, VasylynaThe research is devoted to solving the problem of regulating the porosity parameters during the manufacturing process under magnetic field conditions. The process of synthesizing magnetic nanocomponents based on a mixture of divalent and trivalent iron oxides was given. The use of nanocomponents allowed for improving the conditions for creating porous materials. A device with adjustable magnetic induction was developed to produce porous materials in a magnetic field. The study of the porous material’s structure with the nanopowder content in the magnetic field conditions showed a clear dependence of the structure on the magnetic parameters. When the content of nanocomponents increased to 0.3 %, and the magnetic field induction increased to 2.5 mT, the dispersion of pore sizes decreased by 8–10 times, the density of pores – increased by 15–20 times, and the average diameter of pores – decreased by 12–15 times. Mathematical dependencies that determine the porosity parameters for different values of the magnetic nanopowder content and the level of magnetic induction in the ring electromagnet were proposed. The obtained dependencies allowed for assigning the level of magnetic technological parameters to ensure the given porosity parameters. The developed methods of magnetic technology for creating porous materials can increase the quality and ensure the required porosity level.