
Main / Tatiana Ivanovna Davydova
Author: "Tatiana Ivanovna Davydova"
/table> Lilia Irfanovna Suleimanova, Candidate of Sciences in Engineering; graduated from the Power Engineering Faculty of Ulyanovsk State Technical University; Leading Engineer at FRPC JSC ‘RPA ‘Mars’; an author of articles and inventions in the field of heavy DC detector means. email: suleimanova.lili@mail.ruL.I. Suleimanova, Tatiana Ivanovna Davydova, Candidate of Sciences in Engineering; graduated from the Radioengineering Faculty of Ulyanovsk State Technical University; Leading Engineer at FRPC JSC ‘RPA ‘Mars’; an author of articles and monograph in the field of calculations of radio equipment performance reliability. email: tasha_dav@ inbox.ruT.I. Davydova 
 Calculation of safety index for foreign origin electronic components The article deals with problems arising from the use of foreign origin electronic components, being off the line in standby (storage) mode during operation with periodic monitoring of their operability, as well as with possible ways to solve these problems.
It proposes the method of assessing the safety index based on determining the characteristics of foreign origin electronic components for the standby (storage) mode. The method is implemented using mathematical models with the activation energy of physical and chemical processes of electronic components degradation. The use of mathematical models to solve the problem may allow forecasting the reliability of products in the most efficient way.
The authors give calculations and comparative analysis of the minimum service life (minimum shelf life) at an elevated
temperature for several groups of foreign origin electronic components and for several models of external influencing
factors. Reliability, safety index, foreign origin electronic components. 
 
Sections: Automated control systems
Subjects: Automated control systems. 
Dmitrii Vasilevich Kozmovskii, Candidate of Science in Engineering; graduated from the Faculty of Automated Control Systems Mathematical Support at the A.S. Popov Naval Radioelectronics Institute; Lead Specialist at JSC ‘RPA ‘Impuls’; specializes in the field of development, pilot production and maintenance of special geographically distributed information management systems. email: klimsky@rambler.ru.D. Kozmovskii,
Valerii Ilich Kuvatov, Doctor of Science in Engineering, Professor; Honored Worker of the Higher School of the Russian Federation; graduated from the Faculty of Automated Control Systems Mathematical Support at the A.S. Popov Naval Radioelectronics Institute; Professor of the St. Petersburg University of the Russian Interior Ministry; specializes in the field of mathematical modeling and information technologies of specialpurpose computeraided control systems; an author of articles and monographs on the subject. email: kyb.valery@yandex.ru.V. Kuvatov,
Iurii Ivanovich Sineshchuk, Doctor of Science in Engineering, Professor; Honored Worker of the Higher School of the Russian Federation; graduated from the Faculty of Combat Information and Management Systems of the A.S. Popov Higher Naval Radioelectronics School; Professor of the St. Petersburg University of the Russian Interior Ministry; specializes in the field of analysis and information security, stability of complex systems. email: sinegal@rambler.ru.I. Sineshchuk,
Tatiana Ivanovna Davydova, Candidate of Science in Engineering; graduated from the Radioengineering Faculty of Ulyanovsk State Technical University; Leading Engineer at FRPC JSC ‘RPA ‘Mars’; an author of articles and monograph in the field of reliability calculations and operating of radio engineering facilities. email: tasha_dav@inbox.ru.T. Davydova,


Information Security Method Based on User Activity Monitoring of Distributed Computing Environment
The article analyzes the security features of information resources of distributed telecommunication systems. Geographically distributed computing network is a set of network equipment and communication lines designed for data exchange between user workstations and functional subsystems. Given that more than 90% of the organization’s information is now in electronic form, the problem of ensuring the protection of information circulating in the computer network is becoming an extremely important task. In this regard, the organization of the network structure is associated with the necessary settings of security policies of network users. At the same time, the most real and numerous internal threats that most organizations have remain out of sight. The article describes the systems designed to protect the computer network from an internal intruder, using the control of network connections, accounting and analysis of network traffic. The principle of definition of actual types of activity of users which is based on the analysis of statistical parameters of sessions on various types of network activity, their comparison with profiles of users allowing to classify sessions of network exchange is formulated. Grounded steps and the classification algorithm network activities and separate instances of network sharing in the network activities. Distributed computing environment, information security threats, network exchange session, user activity classification.



Sections: Information systems
Subjects: Information systems. 
Tatiana Ivanovna Davydova, Federal ResearchandProduction Center Joint Stock Company ‘ResearchandProduction Association ‘Mars’, Candidate of Science in Engineering; graduated from the Radioengineering Faculty of Ulyanovsk State Technical University; Leading Engineer at FRPC JSC ‘RPA ‘Mars’; an author of articles and a monograph in the field of reliability calculations and operating of radio engineering facilities. [email: tasha_dav@inbox.ru]T. Davydova,
Andrei Vladimirovich Kalashnikov, Federal ResearchandProduction Center Joint Stock Company ‘ResearchandProduction Association ‘Mars’, graduated from the Faculty of Design and Technology of Electronic Devices of UlSTU; a research engineer at FRPC JSC ‘RPA ‘Mars’; specializes in the field of development of printed circuit boards with electronic components for secondary power supply systems. [email: mars@mv.ru]A. Kalashnikov


A Coefficient Method for Calculating the Reliability of Functional Part of Power Supply Pcb
The reliability of electronic equipment has been the focus of the attention for many decades. The actuality of that grows along with the miniaturization of electronic components and the density of attachment in electronic equipment. The process of reliability calculation becomes more complex and takes more time in view of the growth of type and amount of applied electronic components. Nonfailure operating probability, failure intensity, and mean time to failure are basic qualitative characteristics of the reliability. The dangerous failures of electronic components can have critical and catastrophic consequences in the functionality of electronic equipment. The article deals with the procedure of the reliability calculation using various coefficients. Different mathematical models can be used for the same task of the reliability calculation. In order to solve the tasks, various methods can be used. All these facts may cause different results.Authors represent an approach to the coefficient method allowing to carry out the reliability calculation with higher precision and fidelity. The coefficient method is usable for comparing different ways for reliability calculation. Reliability, coefficient method, time to failures.



Sections: Electrical engineering and electronics
Subjects: Electrical engineering and electronics. 
Vladimir Nikolaevich Moiseev, Ulyanovsk State Technical University, Candidate of Engineering; graduated from the Faculty of Economics and Mathematics of Ulyanovsk State Technical University; a software engineer of the department of Federal ResearchandProduction Center Joint Stock Company ‘ResearchandProduction Association ‘Mars’; an author of articles, inventions in the field of computeraided facilities for naval and aeronautical engineering control. [email: v.n.moiseev@mail.ru]V. Moiseev, Mikhail Iurievich Sorokin, Ulyanovsk Instrument Manufacturing Design Bureau, JSC, Candidate of Engineering; graduated from the Faculty of Information Systems and Technologies of Ulyanovsk State Technical University; Head of department at Ulyanovsk Instrument Manufacturing Design Bureau, JSC; an author of articles, inventions in the field of air pressure probes for aircraft data measuring systems. [email: rto@ukbp.ru]M. Sorokin, Ivan Petrovich Efimov, Ulyanovsk State Technical University, Candidate of Engineering; graduated from Ulyanovsk Polytechnical Institute with a specialty in Aircraft Instrument Engineering; Senior Lecturer of the Measuring and Computing Complexes Department of Ulyanovsk State Technical University; an author of articles, inventions in the field of primary pressure sensors of aircraft data measuring systems. [email: eip@ulstu.ru]I. Efimov, Tatiana Ivanovna Davydova, Federal ResearchandProduction Center Joint Stock Company ‘ResearchandProduction Association ‘Mars’, Candidate of Engineering; graduated from the Faculty of Radioengineering of Ulyanovsk State Technical University; lead design engineer at FRPС JSС‘ RPA ‘Mars’; an author of articles in the field of system analysis and information processing. [email: tasha_dav@inbox.ru]T. Davydova


The Mathematical Model of the Static Pressure Flowing Reciever
The article considers the matters of constructing mathematical models of the static pressure following receivers (SPFRS) designated for sensing static pressure on helicopters in a range of airspeeds to 250…350 km/h. SPFRS consist of contracting and diffusing parts. The mathematical model of SPFRS was developed in accordance with results of experimental researches for defining static pressure, dynamic pressure, speed, speed inaccuracy, altitude inaccuracy. The adequacy of the obtained mathematical models is checked through the comparison with the results of experimental researches. The models allow getting reliable data at the contractor convergence angle in 3070 degree, the diffuser aperture angle in 814 degree, the diaphragm coefficient in 0.150.45, windblast speed in 20250 km/h. The influence of separate components (a contractor and a diffuser) on SPFRS pressure coefficient and correlation between experimental data and the results obtained with the mathematical model are considered. With the use of the obtained mathematical models, the process of developing receivers with predicted metrological characteristics can be automated. The ability to take up receivers with required form factors for the specific control object on the original development cycle promptly has been appeared. Mathematical model, static pressure following receiver, contractor, diffuser.



Sections: Mathematical modeling
Subjects: Mathematical modeling, Automated control systems. 
Dmitry Anatolyevich Litvinov, TAKATAPETRI Rus, Ltd, graduated from the Faculty of Radioengineering of Ulyanovsk State Technical University; postgraduate student at the chair 'Radioengineering' of Ulyanovsk State Technical University; electronics engineer;
author of articles, inventions in the field of antenna systems [email: litvinov_dmitry@mail.ru]D. Litvinov, Tatiana Ivanovna Davydova, FRPC 'OJSC 'RPA 'Mars', graduated from the Faculty of Radioengineering of Ulyanovsk State Technical University; correspondence applicant at the chair 'Combat Management Systems' of the Naval RadioElectronics Academy named after A. Popov (Petergof); development engineer;
author of articles in the field of system analysis and information processing [email: tasha_dav@inbox.ru]T. Davydova




Sections: Telecommunications systems and computer networks
Subjects: Automated control systems, Electrical engineering and electronics. 

Simulation Operation Model for Radio Equipment of Computeraided Dataexchange System
The article describes a simulation model of radioequipment operation for computeraided dataexchange
system created in order to evaluate influence of failure rate of radioequipment devices and time for
their recovery, on probability of uninterruptible dataexchange between computeraided dataexchange
systems of two ships during a longtime period.
The model of the operation process of radio equipment is developed using a mathematical scheme of
queueing system  Qscheme. The model response is an evaluation of the probability of uninterruptible
dataexchange between computeraided dataexchange systems of two ships during a longtime period.
The model factors are the following reliability parameters of each radio equipment: failure rate and recovery
time. The article also gives a blockdiagram of general algorithm of the radioequipment operation process
and blockdiagrams of procedures to define and change states of radioequipment devices simulated by
queueingsystem channels.
The simulation model is at the level of software implementation. The result of the software implementation
of the simulation model with values of the reliability parameters of radioequipment devices, given by
users, is an interval evaluation of probability of uninterruptible dataexchange between computeraided dataexchange systems of two ships during a time period given by users. The required accuracy and
adequacy of the evaluation are ensured by a required number of software iterations, calculated by the
programme, with the same initial data.
To evaluate the importance of factors (reliability parameters of radioequipment devices), a variance
analysis of each of them with response has been made. A combination of achievable factor values when
response values becomes the largest, has been defined by a method of coordinate raising. Simulation model, channel state, variance analysis, method of coordinate raising.



Sections: Modeling for design and control tasks
Subjects: Automated control systems, Architecture of ship's system. 

About Use of Radiotransparent Radomes in Antennas
The article presents advantages of use of radiotransparent radomes for antennas. It gives a variant of automation of snow and ice removal from radiotransparent radome surface by means of electrical heating. It also deals with types of radome heating system.



Sections: Architecture of ship's system
Subjects: Architecture of ship's system. 
