Home – Home – Jornals – Advanced Search

The method of dependence identification is described, in which each model is compared to a linear or nonlinear structural difference scheme. Inclusion of nonlinear difference schemes into structural models significantly expands the number of identifiable dependences. This method makes it possible to choose the sought model among the given set of dependences. The model chosen is a model for which the distance between the vector of estimates of autoregression coefficient and the corresponding tolerance range of coefficients of the structural difference scheme is minimum. This method was validated via statistical modeling by the Monte Carlo method.

A planar package of waveguides with heterogeneously implanted impurity resonance atoms is considered. The conditions of formation of dissipative solitons due to a competition of Kerr saturating nonlinearity and diffraction in the waveguide traps formed by impurity media are determined. It is shown that applying a constant electric field to an impurity resonance medium with a constant dipole moment makes it possible to control the propagation of solitons in Y-shaped waveguide traps.

A solution to the problem of reliable discrimination between the move and stop states of a mine lift is proposed based on processing signals of an accelerometer mounted in the lift cabin. The accelerometer signal is processed using a combination of adaptive whitening algorithms and a nonparametric Neyman-Pearson test that provides an effective solution of the problem under a priori nonparametric uncertainty conditions.

The problem of contactless control of an unmanned aerial vehicle by human gestures is considered. A system of commands is proposed for an AR.Drone 2.0 quadcopter equipped with a builtin computer, two color video cameras, the Linux operating system, and sensors for measuring the flight height, speed, and stability. An Asus Xtion Pro Live three-dimensional sensor based on triangulation and structured light is used to enter data into the control system. Gesture recognition is performed by frame-by-frame processing of a video sequence consisting of depth images. The method does not require initial training, is insensitive to changes in lighting, and is invariant to the sizes of the human palm and body.

An analytical model of a traveling-wave optical resonator with total-internal-reflection mirrors is studied. It is shown that the number of reflections from the mirrors can be increased manifold without attenuation of the light wave in comparison with Fabry-Perot resonators. Ways to eliminate edge effects and design solutions to compensate angular errors in manufacturing the resonator are considered.

This paper describes a technique of simulating the cross section of inelastic scattering of electrons in layered structures from the experimental spectra of the cross section of inelastic scattering of reflected electrons of structural components on the basis of the theoretical Yubero - Tougaard model of the cross section of inelastic scattering in a homogeneous medium and its generalization for the case of layered structures. This technique is tested by an example of studying the spectra of the cross section of inelastic scattering in a two-layer SiO₂/Si structure.

The multiangle ellipsometry method was used to study phase-structural transformations occurring during thermal annealing of vacuum-deposited SiO_x films in air. The analysis of the experimental results carried out with a set of optical models that take into account nonuniformity and anisotropy made it possible to obtain data about the impact of the competitive processes of phase decomposition and oxidation of SiO_x films into macro- and microstructures of systems formed in the annealing temperature range from 650 to 1000 °C.

The depth of two-dimensional plane images spaced apart along the visual axis of the eye for stimulating accommodation in 3D displays is considered. The diffraction depth of the plane images is determined, and it is demonstrated to increase with decreasing image resolution acuity.

A method is proposed for selecting an adaptive threshold for the detection of an interference signal in an optical profilometer based on estimation of optical quantum noise in interferograms of each measurement point. It is shown that when using differential interferograms, this approach allows extending the dynamic range of detection of interference and automate the process of measuring surface topography with a large variation in the light reflection coefficient in the measurement zone. Theoretical calculations, and results of calculations and experiments are presented.

Asymptotic properties of a nonparametric estimate of the two-dimensional probability density of independent random variables are studied. Based on these results, the dependence of its efficiency on data incompleteness in the initial statistical information is determined.