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.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.
Favorskaya M.,Siberian State Aerospace University
Frontiers in Artificial Intelligence and Applications | Year: 2013
The efficient management in Digital e-Library Warehouse (DLW) causes the wide challenges from modern architecture design to advanced customization and personalization. The paper provides the multi-level content-dependent architecture of DLW. Also EPUB (Electronic PUBlication) format extensions were investigated which prefer good multimedia possibilities based on advanced visualization technologies especially for end users working in groups. The usability of DLW is based on skill acquisition with collaboration of advanced software/hardware technologies. The experimental tests on vulnerabilities permitted to choice a more appropriative decision-Content Management System Bitrix Framework as a middleware into proposed multilevel architecture of DLW. © 2013 The authors and IOS Press.
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.
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.