Zheleznogorsk, Russia
Zheleznogorsk, Russia

Siberian State Aerospace University , previously known as Reshetnyov University or SibSAU , is a university in Krasnoyarsk, Russian Federation. Founded in 1960. Wikipedia.

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Sopov E.,Siberian State Aerospace University
IOP Conference Series: Materials Science and Engineering | Year: 2017

Genetic Algorithms (GAs) have proved their efficiency solving many complex optimization problems. GAs can be also applied for "black-box" problems, because they realize the "blind" search and do not require any specific information about features of search space and objectives. It is clear that a GA uses the "Trial-and-Error" strategy to explorer search space, and collects some statistical information that is stored in the form of genes in the population. Estimation of Distribution Algorithms (EDA) have very similar realization as GAs, but use an explicit representation of search experience in the form of the statistical probabilities distribution. In this study we discus some approaches for improving the standard GA performance by combining the binary GA with EDA. Finally, a novel approach for the large-scale global optimization is proposed. The experimental results and comparison with some well-studied techniques are presented and discussed. © Published under licence by IOP Publishing Ltd.

Lopatin A.V.,Siberian State Aerospace University | Morozov E.V.,Australian Defence Force Academy
Composite Structures | Year: 2011

The paper presents the solution of the buckling problem for an orthotropic rectangular plate having two parallel edges simply supported, one edge clamped and the remaining edge free (the SSCF plate). The plate considered is subjected to a linearly varying in-plane load that can take the form of uniform compression, combination of in-plane bending and uniform compression, or pure in-plane bending. The solution technique involves reduction of the relevant variational buckling equation to a one-dimensional form using the Kantorovich procedure and subsequent application of the generalised Galerkin method. The buckling problems are solved for isotropic and orthotropic plates with various aspect ratios. The analytical solution is verified using the finite-element analysis. The comparisons of computational results demonstrate the appropriateness and efficiency of the approach developed in this work for the calculation of critical loads of composite SSCF plates with various dimensional and stiffness parameters. © 2011 Elsevier Ltd.

Lopatin A.V.,Siberian State Aerospace University | Morozov E.V.,Australian Defence Force Academy
Composite Structures | Year: 2015

Free vibrations of a cantilever composite circular cylindrical shell are considered in this paper. The edge of the shell is fully clamped at one end of the cylinder and is free at the open section of the other end. Variational equations of free vibrations are derived based on Hamilton's principle and the problem is solved using the generalised Galerkin method. Analytical formulas enabling calculations of the fundamental frequency are obtained and verified by comparison with the results of a finite element modal analysis. The efficiency of the analytical solution is demonstrated using numerical examples including the design analysis of composite shells subject to constraints imposed on the fundamental frequency. © 2014 Elsevier Ltd.

Belyaev B.A.,Siberian State Aerospace University | Tyurnev V.V.,RAS Kirensky Institute of Physics | Shabanov V.F.,RAS Kirensky Institute of Physics
Optics Letters | Year: 2014

An easy method for designing filters with equalized passband ripples of a given magnitude is proposed. The filter, which is made of two dielectric materials, comprises coupled half-wavelength resonators and multilayer mirrors. The filter design begins with the synthesis of the multimaterial filter prototype whose mirrors consist of quarter-wavelength layers. Optimal refractive indices of the layers in the prototype are obtained by a special optimization based on universal rules. The thicknesses of the mirrors' layers in the final filter are computed using derived formulas. A design procedure example for silicon-air bandpass filters with a fractional bandwidth of 1% is described. © 2014 Optical Society of America.

Bulgakov E.,Siberian State Aerospace University | Sadreev A.,RAS Kirensky Institute of Physics
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We consider light transmission in a T-shaped photonic waveguide coupled with two identical symmetrically positioned nonlinear microcavities. We present two types of symmetry breaking. The first one is a result of mixing of the symmetric input wave with antisymmetric bound states in the Fabry-Pérot interferometer architecture. Similarly, the second mechanism of the symmetry breaking is the result of mixing the symmetrical input wave with the antibonding bound state in a straight waveguide coupled with two cavities positioned perpendicular to the waveguide. In both cases the mixing is due to nonlinearity. In turn, the symmetry-breaking solutions give rise to nonsymmetrical outputs in the T-shape waveguide. These effects are directly demonstrated by the electromagnetic field solutions which are complimented by coupled mode theory for the light transmission. © 2011 American Physical Society.

Bulgakov E.,Siberian State Aerospace University | Pichugin K.,RAS Kirensky Institute of Physics | Sadreev A.,RAS Kirensky Institute of Physics
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We consider light transmission in a two-dimensional (2D) photonic crystal waveguide coupled with two identical nonlinear defects positioned symmetrically aside the waveguide. With the coupled mode theory, we show three scenarios for the transmission. The first one inherits the linear case and preserves the symmetry. In the second scenario, the symmetry is broken because of different light intensities at the defects. In the third scenario, the intensities at the defects are equal but phases of complex amplitudes are different. That results in a vortical power flow between the defects similar to the dc Josephson effect if the input power over the waveguide is applied and the defects are coupled. All of these phenomena agree well with computations based on an expansion of the electromagnetic field into optimally adapted photonic Wannier functions in a 2D photonic crystal. © 2011 American Physical Society.

Bulgakov E.N.,Siberian State Aerospace University | Sadreev A.F.,Russian Academy of Sciences
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We consider a Fabry-Perot resonator (FPR) comprised of two off-channel nonlinear defects coupled to the photonic waveguide. For the linear case FPR can support bound states in the form of standing waves between the defects if a distance between them is quantized. For the nonlinear case the bound states appear for arbitrary distance between the defects if electromagnetic intensity is quantized. For transmission through the FPR we reveal additional resonances which are the result of coupling of incident wave with the bound states because of nonlinearity of the defects. The resonances are spaced at the eigenfrequencies of bound states with a width proportional to the input amplitude. The theory of the FPR based on the simple Wang and Fan model is complemented by the tight-binding one. The results for the transmission and bound states in these models agree with computations in real two-dimensional photonic crystal waveguide coupled with two off-channel defects fabricated from a Kerr-type material. © 2010 The American Physical Society.

Goryashin N.N.,Siberian State Aerospace University | Sidorov A.S.,Siberian State Aerospace University
IEEE Electron Device Letters | Year: 2013

This letter presents the results of the investigation of transient responses and capacitance values of single-and multijunction solar cells (MJSCs). Two time-domain methods (short-circuit (SC) current decay and open-circuit voltage buildup) were used to estimate capacitance. It is shown that the MJSC exhibits two capacitance values. During transition from open-circuit point to SC point, the capacitance is some hundreds of nanofarads, whereas during reverse transition, the capacitance is about microfarads. The reasons of the capacitance difference are explained. Recommendations on how to use these capacitance values for the sequential switching shunt regulator application are given. © 1980-2012 IEEE.

Favorskaya M.,Siberian State Aerospace University
Studies in Computational Intelligence | Year: 2013

Training visual systems have significant role for people with limited physical abilities. In this paper, the task of sign alphabet learning by poorlyhearing children was discussed using advanced recognition methods. Such intelligent system is an additional instrument for cultural development of children who can not learn alphabet in the usual way. The novelty of the method consists in proposed technique of features extraction and building vector models of outer contours for following identification of gestures which are associated with letters. The high variability of gestures in 3D space causes ambiguous segmentation, which makes the visual normalization necessary. The corresponding software has two modes: A learning mode (building of etalon models) and a testing mode (recognition of a current gesture). The Visual system of Russian sign alphabet learning is a real-time application and does not need high computer resources.©Springer-Verlag Berlin Heidelberg 2013.

Sopov E.,Siberian State Aerospace University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

There exists a great variety of evolutionary algorithms (EAs) that represent different search strategies for many classes of optimization problems. Real-world problems may combine several optimization features that are not known beforehand, thus there is no information about what EA to choose and which EA settings to apply. This study presents a novel metaheuristic for designing a multi-strategy genetic algorithm (GA) based on a hybrid of the island model, cooperative and competitive coevolution schemes. The approach controls interactions of GAs and leads to the self-configuring solving of problems with a priori unknown structure. Two examples of implementations of the approach for multi-objective and non-stationary optimization are discussed. The results of numerical experiments for benchmark problems from CEC competitions are presented. The proposed approach has demonstrated efficiency comparable with other well-studied techniques. And it does not require the participation of the human-expert, because it operates in an automated, selfconfiguring way. © Springer International Publishing Switzerland 2015.

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