Volga State University of Telecommunications and Informatics

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Samara, Russia
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Shevchenko A.P.,Samara University | Blatov I.A.,Volga State University of Telecommunications and Informatics | Kitaeva E.V.,Samara University | Blatov V.A.,Northwestern Polytechnical University
Crystal Growth and Design | Year: 2017

We propose three independent methods for determining geometrical shape and topological type of local atomic environment in crystals that is represented as a coordination figure. The methods are based on comparison of the edge graphs of the simplified Voronoi polyhedra, maximizing volume of intersection of polyhedra, and comparison of angular fingerprints of polyhedra. We implemented the methods to the program package ToposPro and tested them on 9642 crystal structures of five-coordinated copper and zinc complexes. The methods showed good selectivity and coincidence. We discuss correlations of the coordination figure type with other structure descriptors and perspectives to use the obtained results in knowledge databases. © 2016 American Chemical Society.


Bourdine A.V.,Volga State University of Telecommunications and Informatics | Delmukhametov O.P.,Ufa State Aviation Technical University
Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) | Year: 2013

A method for calculating the transmission parameters of random-order launched modes, propagating in telecommunication quartz multimode optical fibers with a random gradient profile of the refractive index, bounded by one external solid cladding, is presented. The solution is based on the use of the modified Gaussian approximation, generalized to the above case, in combination with the mixed finite element method, adapted for analysis of multimode fiber waveguides. Copyright © 2013 by Begell House, Inc.


Lozhkin L.D.,Volga State University of Telecommunications and Informatics | Neganov V.A.,Volga State University of Telecommunications and Informatics | Soldatov A.A.,Volga State University of Telecommunications and Informatics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2016

This paper discusses various issues related to the development of a uniform-contrast color space that transforms ellipses (in 2D space) or ellipsoids (in 3D space) into circles or spheres, respectively. It is important to have a uniform-contrast color system in which the geometrical distance between colors on a chromaticity diagram is independent of the colors (chromaticities) being compared. © 2016 Optical Society of America.


Glushchenko A.G.,Volga State University of Telecommunications and Informatics | Glushchenko E.P.,Volga State University of Telecommunications and Informatics | Kazanskiy N.L.,Samara State Aerospace University | Toporkova L.V.,Volga State University of Telecommunications and Informatics
Computer Optics | Year: 2013

The features of the interference of forward and backward waves in longitudinally magnetized ferromagnetic material, which is due to the Faraday effect exhibits properties of non-reciprocity. It is shown that the nonreciprocity parameters of structures leads to the absence of phase oscillations in separated points in space located between the nodes.


Klyuev D.S.,Volga State University of Telecommunications and Informatics | Sokolova Y.V.,Volga State University of Telecommunications and Informatics
Journal of Communications Technology and Electronics | Year: 2015

A method for calculation of the characteristics of reflector antennas (RAs) is proposed. The method is based on the mathematical apparatus of 2D hypersingular integral equations. Radiation patterns of a RA with a reflector formed by a parabolic cylinder as well as distributions of the current density on the surfaces of the reflector and the feed calculated by this method are presented. © 2015, Pleiades Publishing, Inc.


Klyuev D.S.,Volga State University of Telecommunications and Informatics | Sokolova Y.V.,Volga State University of Telecommunications and Informatics
Journal of Communications Technology and Electronics | Year: 2015

A self-consistent method for calculation of the input impedance of a microstrip dipole (MSD) is proposed. A hypersingular integral equation (HSIE) for an unknown function of the distribution of the current density on the MSD surface is derived. A numerical method for calculation of the HSIE is described. Plots of the input impedance as a function of the dipole length and the substrate thickness are presented. © 2015, Pleiades Publishing, Inc.


Tarasov V.,Volga State University of Telecommunications and Informatics | Bakhareva N.,Volga State University of Telecommunications and Informatics | Ushakov Y.,Orenburg State University
WMSCI 2015 - 19th World Multi-Conference on Systemics, Cybernetics and Informatics, Proceedings | Year: 2015

The paper presents a software add-on to the traffic analyzer Wireshark to calculate the moment characteristics of the distribution of intervals between packets. It obtains an analytical solution for the average waiting time for queuing type H2/M/l Hyperexponential distribution with 2nd order intervals of the input stream by solving a Lindley integral equation using the method of spectral decomposition. It is shown that in this case, the distribution of intervals between the requirements of the input flow can be approximated up to its first three moments.


Nikolaev B.I.,Volga State University of Telecommunications and Informatics | Chingaeva A.M.,Volga State University of Telecommunications and Informatics
WMSCI 2015 - 19th World Multi-Conference on Systemics, Cybernetics and Informatics, Proceedings | Year: 2015

In this paper we present a method for frame and timing synchronization in frequency selective fading channels. The method utilizes periodical structure of training sequences to build a differential frame "image", which is then used to find an exact training sequence position-hence the name of the method. The results of statistical simulation of the proposed method in ISI channel are also given and discussed.


Lozhkin L.D.,Volga State University of Telecommunications and Informatics
Journal of Communications Technology and Electronics | Year: 2013

It is shown that ambient illumination of the TV screen introduces color distortions in viewed TV programs. The magnitude and type of these distortions depend on the brightness and spectrum of the source of ambient illumination. A method for correction of these distortions is proposed and two ways of its implementation are considered. © 2013 Pleiades Publishing, Ltd.


Lozhkin L.D.,Volga State University of Telecommunications and Informatics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal) | Year: 2012

This paper discusses the possibility of constructing an equal-contrast color space based on the mathematical apparatus used in Einstein's general theory of relativity. Such a construction makes it possible to avoid the drawbacks inherent to the color spaces that are currently known and used - namely, the difference of the sizes of the MacAdam ellipses, depending on the chromaticity of the stimulus. © 2012 Optical Society of America.

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