Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Olga USSATOVA"

Algorithm for generating temporary password based on the two- factor authentication model DOI:10.15199/48.2019.05.25

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Currently while ensuring information security in an automated priority management system is ensuring the availability, integrity of configuration management information and information about personal data. Increased attention has been paid to the prevention of unauthorized access to the system to maintain its stable functioning [1]. However, due to the constantly increasing number of different services and various attacks on user accounts, there is a need to use two-factor authentication methods to ensure information security. In the past decade, these methods have been widely used in various areas of information and communication technologies. They are related to issues of identification and access of a subject to confidential information [2, 3]. They are trusted by a large number of companies, including high-tech organizations, financial and insurance sectors of the market, large banking institutions and public sector enterprises, independent expert organizations, as well as research firms [1]. Two-factor authentication - a security processing algorithm, in which the user provides two different factor authentication, which will improve the protection of user’s data and access to user credentials, and the user's resources. Traditional systems use a username and password for authentication. This method provides a minimum level of security, since the names and passwords can be easily intercepted and even guessed. Two-factor authentication provides a higher degree of protection than single-factor authentication, in which the user offers only one factor, usually a password. Authentication methods with two factors depend on the password and the second factor. Two-factor authentication is used to control access to sensitive systems and data. Development and use of two-factor authentication algorithm for the automated control systems. Goals and objectives of the study The purpose of the article is to develop a two-factor [...]

Development of a multi frequency phase method for measuring ranges DOI:10.15199/48.2019.04.25

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In the field of radar sounding, impulse methods for measuring ranges are traditionally used [1,2]. These methods are clear and easy to measure. But the finite duration of the probe pulse limits the accuracy and resolution of the methods. The use of frequency methods makes it possible to improve the accuracy of measuring distances [1,2]. Phase methods for measuring range are known [1,3]. These methods allow measuring the range of only one object, but with high accuracy. Also, phase methods, however, like frequency ones, do not have a "dead zone", which allows them to have a clear advantage over pulsed methods when measuring short ranges. But in the case of frequency methods, probing signals have a wider bandwidth than in the case of phase methods. The range of sounding frequencies is strictly limited to the minimum required quantity that allows to obtain the given accuracy, which has a distinct advantage over other methods. When performing range measurements, the main task is to separate the signals reflected from each object. The developed multi-frequency phase methods allow me to separate the signals reflected from objects by analyzing the amplitude-frequency and phase-frequency characteristics of the total reflected signal, which represents the sum of the harmonic signals reflected from each object in a given frequency range [4-6]. Let us cite short results of the studies which made it possible to obtain a mathematical model on the basis of which it became possible to develop a multi frequency phase method for measuring distances to many objects [7]. Unlike time measurements, when signals reflected from each object are separated in time. In phase measurements, all harmonic signals reflected from all objects act simultaneously, and therefore, as the medium in which radio signals propagate can be considered linear systems, they are algebraically summed at each point. Method Considering a system of N objects that are sou[...]

Experimental research characteristics of counterbalance valve for hydraulic drive control system of mobile machine DOI:10.15199/48.2019.04.18

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Introduction Mobile machines with hydraulic drive are widely used in industry, transport branch, agriculture [1-3]. Such machines, as a rule, are equipped with high variety of removable operating tools. It enables to use them during greater part of calendar year for performing various operations, such as digging, materials handling, loading operations with bulky materials. Systems of hydraulic drives control of such machines for energy saving, must provide the possibility of regulation of operation organs motion speed and working pressure of pumps in wide ranges. It is important to provide the reliable motion control of the executive device in case of alternating load. Hydraulic drives, based on spool hydraulic separators are widely used in mobile machines. In the process of operation such spools wear, this reduces the degree of leak tightness of hydraulic lines and complicates the operator’s control over the position of the executive device with the load. To provide the possibility of the control over the motion of the executive device and to decrease nonproductive power expenditures in case of the alternative loading counterbalance valves (CBV) are used in the hydraulic drives of mobile machinery. At the same time to provide high degree of leak tightness of operating hydraulic lines controlled check valves are used. Available CBV and controlled check valves increase the cost of the system of hydraulic drive control, its dimensions, mass and operation cost of the mobile machinery [1-7]. The authors elaborated the construction of CBV that simultaneously provides the possibility of the motion speed control of the executive device at the alternative loading and increases the leak tightness degree of the operating hydraulic lines of the hydraulic drive. The following problems are solved to realize the elaborated CBV construction:  provision of high degree of leak tightness;  statistic characteristics st[...]

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