# Oleg Victorovich KravchenkoDorodnicyn Computing Centre of Federal Research Centre "Computer Sciences and Contrlol" RAS, Moscow, Russia · Department of Mathematical Modeling of Computer-Aided Design Systems

Oleg Victorovich Kravchenko

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## About

94

Publications

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141

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Introduction

Additional affiliations

September 2014 - present

February 2012 - present

September 2011 - present

## Publications

Publications (94)

Helical and chiral plasma structures are ubiquitous especially in nuclear
fusion devices and space plasmas. However, the spontaneous formation of helical
structures have rarely been noticed in non-equilibrium cold plasma jets that have wide
applications in biomedicine and material science. Recently the chiral plasma plume
without any notable asymme...

It has been established that polar cap patches are capable of triggering phase scintillation via various convective instabilities such as Gradient Drift, Gravitational Interchange, Current Convective, and Kelvin-Helmholtz Instabilities coupled with turbulent plasma processes in the cold and warm approximation. These multiple instabilities provide a...

The extended generalized G′G–expansion is well defined and an efficient technique, which is used to obtain the exact traveling wave solutions to the governing nonlinear equations with constant coefficients as well as variable coefficients. In this paper, the modified Korteweg–de Vries (mKdV) equation and Burgers equation with variable coefficients...

The Schamel Burgers’ equation is a nonlinear partial differential equation which produces the shock type traveling waves in extraordinary physical situations. Previously, this sort of equation is solved with well known tan−hyperbolic method. In this paper, we present the exact solutions of the Schamel Burgers’ equation using generalized-improved G′...

A model for positive/negative sentiment analysis of phone conversations audio data is considered. Over six thousand features are retrieved employing opensmile Python library, afterward the most significant features are selected. Sentiment analysis of the related text data of conversations is also carried out. An attempt to combine features retrieve...

Approximation theory constitutes a useful field that is related to quasi all other fields, in both theoretical and applied sciences. In approximation theory, the aim is generally to construct an idea about a function that is usually impossible or difficult to evaluate directly, and which is usually unknown. Such functions appear widely in PDEs, pro...

The paper is devoted to the problem of the interaction between a shock wave and a thermally stratified energy source for the purpose of supersonic/hypersonic flow control realization. The effect of the thermally stratified energy source on a shock wave with the Mach number in the range of 6–12 is researched numerically based on the Navier-Stokes sy...

In this paper, the problem of constructing a model for detecting and filtering unwanted spam messages is solved. A fully connected convolutional neural network (FCNN) was chosen as the model of the classifier of unwanted emails in email. It allows you to divide emails into two categories: spam and not spam . The main result of the research is a sof...

The paper proposes a model of a neuromorphic processor, consisting of excitatory and processing neurons that are oscillators and detectors. The concept of neuromorphic computing, implemented by generating a spin current due to optical excitation of magnetic oscillations in an antiferromagnet is considered. The inverse spin Hall effect causes the ge...

Large data bank of images has been accumulated during atmospheric cloudinessground-based observations from 2017 to 2020 near Fryazino city, Moscow Region. The problemof obtained images classification into several types is considered. The types are clear sky (noclouds); cumulus cloudiness of various extent (humilis, mediocris, congestus); very power...

The paper is devoted to the problem of primary data processing obtained in the vibration measurements during the processing of the workpiece on a milling machine with computer numerical control. An experimental setup is described and an algorithm for analysing vibration diagnostics signals using a mathematical machine learning tool is proposed. Spe...

The frequency pattern of the process is investigated by analyzing spectrograms constructed using the window Fourier transform. A set of window functions consists of a rectangular, membership, and windows based on atomic functions. The fulfillment of the condition for improving the time localization and energy concentration in the central part of th...

The preliminary processing of the signal coming from the vibration sensor is performed. Spectral analysis methods allow identifying the distinctive zones corresponding to three parameters: the average amplitude of vibrations, the average value of the spectrum, and the complex parameter of the vibration density obtained using interpolation methods....

This paper presents numerical modelling of a thermally stratified energy source’s effect on the supersonic flow past a body “double-wedge - plate”. A multiple generation of the Richtmyer-Meshkov instabilities was obtained. These instabilities cause almost complete destruction of the bow shock front inside the source area and form a new multi-vortex...

Atomic functions (AF) are infinitely differentiable compactly supported solutions of a functional-differential equations. The review presents a brief analysis of current publications on AF and related topics and some new results discussed in detail.

Experimental data on the creation of ionization unstable gas discharge plasma with large-scaled and small-scaled ionisation strata are presented. The redistribution of kinetic and internal energy between a stratified energy source and the area behind a shock wave is numerically studied on the base of the system of Navier-Stokes equations. Generatio...

For the conditions obtained in experiments on the interaction between a shock wave and the ionization-unstable plasma, the influence of a thermally stratified energy source on the front of a shock wave is numerically modeled on the basis of the full system of Navier–Stokes equations. It is shown that the front curvature detected in schlieren images...

For the conditions obtained in experiments on the interaction of a shock wave with an ionization unstable plasma, a numerical simulation of the impact of a thermally stratified energy source on the shock wave front is performed based on the full Navier-Stokes equations. It has been shown that its curvature, registered in schlieren-images, is associ...

The study is devoted to the development of the subject of an asymmetrical energy source impact on the flow around supersonic AD bodies in a viscous heat-conducting gas (air). The research is based on the full system of Navier-Stokes equations. The viscosity coefficient and the coefficient of thermal conductivity are considered to be dependent on th...

The interaction of a plane shock wave ( M = 5) with an ionized plasma region formed before the arrival of a shock wave by a low-current glow gas discharge is considered experimentally and numerically. In the experiment, schlieren images of a moving shock-wave structure resulting from the interaction and consisting of two discontinuities, convex in...

The interaction of a plane shock wave (M = 5) with an ionized plasma region formed before the arrival of a shock wave by a low-current glow gas discharge is considered experimentally and numerically. In the experiment, schlieren images of a moving shock-wave structure resulting from the interaction and consisting of two discontinuities, convex in t...

The conducted study is devoted to the research area of control of high speed flows and shock-wave configurations. Experimental and numerical results on the interaction of a plane shock wave (M = 5–6) with the area formed by ionization instability in gas discharge plasma at a pressure of 3–7 Torr and gas-discharge current of 100–400 mA are presented...

Introduction A number of investigations of dynamics of complex plasma with dusty component were published in recent years [1, 2]. The first dusty plasma structure containing empty domains (voids) was discovered in the course of the experiments on the board of the International Space Station [2]. Also, in laboratory conditions the voids have been fo...

The structure of the dusty crystal is studied by Langevin molecular dynamics simulation when the influence of ion flow is taken into account. The “Yukawa/point-wake” model is used to describe the particle-particle interaction and particle-wake interaction in the dust system. The particles arrange themselves compactly and orderly in the horizontal d...

The paper is devoted to the control of supersonic flows past aerodynamic bodies under the action of external energy deposition. Mechanism of the interaction of a bow shock over a body with the oblique shock resulting from the refraction of the bow shock at the external energy source surface is revealed. Different types of shock waves intersection m...

The article refers to the field of supersonic flow control via external energy deposition. Passing a strong shock wave (M=5-6) through the region of pre-formed ionization instability in gas discharge plasma has been studied experimentally and numerically. In the experiments the ionization spherical strata have been obtained arising in the gas disch...

The effects of electric dipole moment, the number of dipolar particles, and system temperature on the structures and dynamics of a dipolar dust particle system are studied by molecular dynamics simulations. The results show that the larger electric dipole moment is favorable for the formation of a long-chain structure, the larger number of dipolar...

The influence of the magnetic field shear is studied on the $E\times B$ (and/or Gravitational) and the Current Convective Instabilities (CCI) occuring in the High latitude F-layer ionosphere. It is shown that magnetic shear reduces the growth rate of these instabilties. The magnetic shear induced stabilization is more effective at the larger scale...

Generation of steady structures with empty regions (voids) has been modelled numerically in unmoving and moving flows of dusty plasma. The simulations are based on the known model of Avinash, Bhattacharjee and Hu of formation of a void in a dusty plasma flow. The model has been reduced to the divergent form and two algorithms of first and second or...

In 2016 marks 45 years since the publication of the first papers on the theory of infinitely differentiable finite solutions of a functional differential equations so-called atomic functions (AF). The review presents a brief analysis of the publications, since the first ones until now. Both individual and scientific schools investigations are consi...

A large number of experimental and theoretical papers, books and reviews devoted to the investigations of the dynamics of dusty plasma were published in recent years. However it is not so much studies in which the simulation are performed and the computer codes are described. The first dusty plasma region without dust particles (domain or void) was...

Wave particle interactions play a major role in the explanation of electron cyclotron resonance heating (ECRH) and
electron cyclotron current drive (ECCD) physics [1,2,3]. Further, it is seen that trapped particles tend to degrade the
efficiency of ECCD since the resulting bounce motion prevents the unidirectional flow of current [4,5]. In context...

The fourth part of the review is a continuation of the first three parts [1-3] and is devoted to the application of atomic and R-functions to locus description problems and the electromagnetic analysis of compound cross-section waveguides.

In this article, a simple computational scheme to numerical solution of quasi-linear hyperbolic equation is considered. The idea of the following technique is to approximate the spatial derivative by using of some interpolant, for example, the well-known cubic B-spline or cha, n interpolant. The time derivative is approximated by the first-order fo...

Wavelets are widely applied in modern science and technology. Construction of wavelets based on new family of atomic functions cha, n is presented. This family also allows unified examination of wavelets based on atomic functions up(x), ha(x) and Ξn(x). The construction of orthogonal Kravchenko wavelets (also known as WA-systems) is based on the Ri...

In present article we describe a number of results in a systematic way concerning to both signal and image processing problems with respect to atomic functions theory and Prouhet-Thue-Morse sequence.

The second part of the review is devoted to the application of the WA-system of Kotel’nikov functions in various physical systems. The calculation algorithms based on wavelets are superior to the Fourier transforms owing to the local properties in both spatial and frequency domains, orthogonality, zero moments, and multiscale analysis of the former...

The main physical applications of atomic, WA-systems, and R-functions are presented. The Whittaker-Kotelnikov-Shannon sampling theorem is generalized on the basis of atomic functions. Applications of atomic functions in the theory of probability and random processes, interpolation of stationary random processes with atomic functions, and a new clas...