In this paper we investigated the conditions of favorable start-up of fixed-speed induction motors in order to increase the functional reliability of the engines. The methods of controlled soft start of induction electric motors with a squirrel-cage rotors are investigated. The study of the mathematical model of induction motors for determining the dependencies of reducing the dynamic component of the transient electromagnetic moment and the magnitude of the starting current. A computer simulation to identify the effectiveness of different methods of controlled start-up of induction motor was carried out. To generate the starters’ models, the MatLab modelling application, Simulink and SimPowerSystems block libraries were used. Based on the results of transient processes simulation in MatLab, the comparative characteristics for different methods of starting an induction motor were given.

This paper examines the conditions for conducting a Man in the middle (MITM) attack in networks using the Address Resolution Protocol (ARP), as well as possible methods for detecting and preventing such attacks. Examples of implementation of denial of service (DoS) attacks in a peer-to-peer network using the ARP protocol are given. An implementation of an ARP spoofing attack in Python and C # using the sharppcap library is presented. Examples of Man-in-the-middle attacks such as DHCP spoofing and ICMP redirection are provided. Describes the techniques of hacking the router and spoofing the MAC address.

Despite the presence of stable demand for food and other agricultural resources, the trend of reducing the number of workers in agriculture in almost all countries of the world in the coming years will continue. This reduction should be partially compensated by the growth of labor productivity and the strengthening of the technical equipment of the industry, innovations and improvements in the applied methods, tools and production technologies. On the other hand, the reduction in the number of personnel in working professions must be compensated for by increasing their professionalism and compliance with professional standards. In these conditions, the requirements for professional competence of workers in working professions in the implementation of production processes for the cultivation, harvesting and post-harvest processing of crop products, maintenance and care of farm animals and poultry, land reclamation and other work should be carried out in strict accordance with the organizational and economic principles of agricultural production. In order to identify factors affecting the turnover of workers in agricultural occupations, we conducted a special correlation and regression analysis, which allowed us to establish that the main ones are: labor remuneration; the number of hospital beds per 10,000 people in rural areas; the proportion of women in the staff of the working professions of agricultural organizations; the level of profitability of agricultural enterprises; the proportion of personnel working professions of agricultural organizations under the age of 30 years; the size of the energy capacity per 100 hectares of sown area of agricultural organizations.

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