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Development of models of the electromagnetic environment in buildings and urbanized areas
(Технологічний центр, 2022-12-30) Levchenko, Larysa; Ausheva, Nataliia; Burdeina, Nataliia; Aznaurian, Iryna; Biruk, Yana; Kasatkina, Nataliia; Matvieieva, Iryna; Nazarenko, Vasyl; Nikolaiev, Kyrylo; Tykhenko, Oksana
A set of measures and means to control the electromagnetic situation of the environment in the territories of urban development, in buildings and individual premises has been substantiated and developed. The simulation tools show the ability to rationalize the parameters of overhead lines with voltages of 220 kV and below, which will reduce the electromagnetic load in the territories. Modeling the propagation of fields from underground high-voltage lines has established that the values of magnetic fields compared to overhead lines are lower up to 30 times. Models of propagation of electromagnetic fields of very high and ultrahigh frequency were built. Sources of electromagnetic fields of non-production origin in industrial buildings have been investigated. Uncompensated currents in power networks with nonlinear electric consumers generate magnetic fields by induction of 0.35–1.20 μT, which exceeds the maximum permissible levels of operation of computer equipment. Leakage currents on grounded metal structures generate magnetic fields with 1.52–6.75 μT. Simulation of the propagation of electric and magnetic fields of components of personal computers of controlled ranges according to the MPRII standard was carried out. Models of propagation of the magnetic field of industrial frequency around electric motors and generators with their cross sections were built. On the basis of such models, design schemes for placing equipment in production areas are selected or places of safe stay and movement of personnel are selected. The expediency of using shielding to reduce field levels to safe values due to coating surfaces with liquid protective mixtures was shown. Metal-containing composition based on water-dispersion paint makes it possible to reduce the level= of magnetic field of industrial frequency by 2.5–2.6 times, electric field by 1.6–1.7 times, electromagnetic field of industrial frequency – by 1.2–1.3 times.
Identification of Entrant's Abilities on the Basis Fuzzy Inference Systems
(ITTAP’2021, 2021-11) Terenchuk, Svitlana; Riabchun, Yuliia; Poltorachenko, Nataliia; Aznaurian, Iryna; Levashenko, Vitaly; Mezzane, Daoud
The paper is devoted to solving such important social task as providing professional assistance to entrants at choosing a specialty for study. The relevance of the development and implementation intelligent infocommunication systems into the entrant's professional abilities assessing process is shown. The aim of the research is to create the Fuzzy Inference System, which is the unit of the Neuro-Fuzzy Inference System of the Specialized Intellectual System of Entrant's Abilities Identification. It is proposed the neuro-fuzzy inference system from pairs of fuzzy artificial neural networks of Takagi-Sugeno-Kanga categories and Sugeno-type fuzzy inference systems. The possibility of using fuzzy artificial neural networks of Takagi-Sugeno-Kanga categories to solve the problem of estimation the entrant's special abilities is rationaled. Also the expediency of using the fuzzy Sugeno-type inference system is rationaled and customizing up input data's membership functions is shown. Herewith the input variables reflect the expression measure of the entrant's interest in the profession and the results of passing computer game tasks' different levels. So, the created Sugeno-type fuzzy inference system, unlike the existing ones, is based on rules that reflect the interests and abilities of the person to the profession. Thus for formation of the personality portrait computer game tasks of professional orientation are used. Unified rules that form knowledgebase in fuzzy inference systems are based on the expert experience. At the same time the results of Fuzzy Inference System work confirm the system capability to solve the problem of the person professional identification in fuzzy conditions without of rules-analogues in the system's knowledgebase.
Intelligent information technologies implementation to the process of professional self-identification
(CEUR Workshop Proceedings, 2012-03) Aznaurian, Iryna; Yeremenko, Bohdan; Riabchun, Yuliia; Ploskiy, Vitalii; Mezzane, Daoud; Kryvinska, Natalia
The latest learning technologies implementation, based on new approaches to the presentation and acquisition of knowledge, requires appropriate modern methods of assessment. The search for perfect methods for assessing the abilities of entrants and students at the present stage of information technology development is extremely important, because the objectification of the assessment process, providing feedback, provides an opportunity to coordinate the development of personality. The main attention in this paper is directed on the decision of questions of professional orientation by means of testing which assumes performance of game tasks of a professional direction. The research presents a conceptual model of a specialized intelligent system, which is designed to support the decision of the applicant to choose a specialty of higher education institution of construction profile. The paper also shows fragments of the system with professional game tasks, which reflect the level of spatial imagination of the individual and the ability to perform functional duties in accordance with the personnel requirements of different professions of construction. The formation scheme of the recommendatory conclusion on results of performance of these tasks is offered the mechanism of fuzzy inference of the recommendatory conclusion is shown. Clear and fuzzy criteria are proposed that can be used to justify the recommendation conclusion. The possibility of using the fuzzy artificial neural network Takagi-Sugeno-Kang to setup the parameters of the model used to reflect certain professional abilities of the individual is shown.
Monitoring And Management Ion Concentrations In The Air Of Industrial And Public Premises
(2022-02-25) Bolibrukh, Borys; Glyva, Valentyn; Natalia, Kasatkina; Levchenko, Larysa; Tykhenko, Oksana; Panova, Olena; Bogatov, Oleg; Petrunok, Tetiana; Aznaurian, Iryna; Zozulya, Sergey; Aznaurian, Iryna
This paper reports a substantiated method and a designed device for controlling the concentrations of air ions in premises in accordance with the European standards SBM 2015. The use of an ultrasonic humidifier with a capacity of 25 W for two hours increases the concentration of negative ions around the device from 240 to 560 cm-3, positive ones ‒ from 260 to 410 cm-3. The intensity of the electrostatic field of a polymeric coating decreases from 5.1 to 0.2 kV/m. The disadvantage of the humidifier is a small radius of influence (1.0–1.5 m) and the inability to control the polarity of ions. It has been experimentally established that air cooling systems (split systems) deionize the air of the premises. Degrees of deionization and dominating polarity are unpredictable and different for devices of different manufacturers and brands. To control the ion composition of the air simultaneously with the maintenance of normative relative humidity and stresses of static fields, the structure was proposed and the effectiveness of a bipolar ultrasonic air ionizer with adjusted performance and dominating polarity has been tested. The maximum productivity of the ionizer is 4,000–5,000 cm-3. The radius of exposure is 5 m (reducing the concentration of ions with a distance to 500 cm-3). To pass the ionized air through an air capacitor, the number and predominant polarity of air ions are regulated by the polarity and voltage on the covers of the capacitor. It was established that in order to service a room with an area of 50 m2, an ultrasonic emitter with a capacity of 25 W would suffice. The adjustability of the device performance makes it possible to reduce or increase the service area. The ability to purify air from suspended particles is shown. During the two hours of operation of the ionizer, the dust content decreased from 4.3–4.4 mg/m3 to 1.4–1.6 mg/m3.