Voronezh State Technical University

Voronezh, Russia
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Podvalny S.,Voronezh State Technical University | Vasiljev E.,Voronezh State Technical University
IOP Conference Series: Materials Science and Engineering | Year: 2017

The article refers to the construction of intelligent systems based artificial neuron networks are used. We discuss the basic properties of the non-compliance of artificial neuron networks and their biological prototypes. It is shown here that the main reason for these discrepancies is the structural immutability of the neuron network models in the learning process, that is, their passivity. Based on the modern understanding of the biological nervous system as a structured ensemble of nerve cells, it is proposed to abandon the attempts to simulate its work at the level of the elementary neurons functioning processes and proceed to the reproduction of the information structure of data storage and processing on the basis of the general enough evolutionary principles of multialternativity, i.e. the multi-level structural model, diversity and modularity. The implementation method of these principles is offered, using the faceted memory organization in the neuron network with the rearranging active structure. An example of the implementation of the active facet-type neuron network in the intellectual decision-making system in the conditions of critical events development in the electrical distribution system. © Published under licence by IOP Publishing Ltd.

Podvalny S.L.,Voronezh State Technical University | Vasiljev E.M.,Academy of Public Administration
Procedia Computer Science | Year: 2017

The article deals with intelligent systems that contain artificial neural networks. After a close comparison of artificial and biological neural networks the authors reveal some fundamental flaws of artificial neural networks. It is shown that the reason for those disadvantages is the constancy of structure or the so called passivity of the neural network. To avoid this problem it is proposed to simulate the information processes in the neural network instead of simulating neurons themselves. The following consideration involves several evolutionary principles of multi-alternativity, such as multilevel approach, diversity and modularity. Those principles find their implementation in facet memory organization that is characterized by the reconfigurable structure and therefore close to its biological prototype. The advantage of the suggested approach is demonstrated by the example of an intellectual system based on an active neural network. The system applied to control an electrical supply network under critical events, such as breaks and overloads. In case of a critical event neural network takes the blocking decision that prevents breakage or accident conditions in the electrical network. © 2017 The Authors.

Moskalev E.A.,German Cancer Research Center | Zavgorodnij M.G.,Voronezh State University | Majorova S.P.,Voronezh State Technical University | Vorobjev I.A.,Russian Academy of Medical Sciences | And 3 more authors.
Nucleic Acids Research | Year: 2011

DNA methylation profiling has become an important aspect of biomedical molecular analysis. Polymerase chain reaction (PCR) amplification of bisulphite-treated DNA is a processing step that is common to many currently used methods of quantitative methylation analysis. Preferential amplification of unmethylated alleles - known as PCR-bias - may significantly affect the accuracy of quantification. To date, no universal experimental approach has been reported to overcome the problem. This study presents an effective method of correcting biased methylation data. The procedure includes a calibration performed in parallel to the analysis of the samples under investigation. DNA samples with defined degrees of methylation are analysed. The observed deviation of the experimental results from the expected values is used for calculating a regression curve. The equation of the best-fitting curve is then used for correction of the data obtained from the samples of interest. The process can be applied irrespective of the locus interrogated and the number of sites analysed, avoiding an optimization of the amplification conditions for each individual locus. © 2011 The Author(s).

Kravets O.Ya.,Voronezh State Technical University
Automation and Remote Control | Year: 2013

Specific features in mathematical modeling of the parameterized TCP Reno protocol based on Markov chains are discussed. Explicit formulas for transition rates are derived. © 2013 Pleiades Publishing, Ltd.

Borshch N.A.,Voronezh State Technical University
Semiconductors | Year: 2016

The results of calculation of the electronic structure of Si-based Pt-substituted clathrates are reported. Calculation is carried out by the linearized-augmented-plane-wave method. The effect of the number of substitutions and their crystallographic position in the unit cell on the electron-energy spectrum and the electronic properties of Pt-substituted clathrates is analyzed. © 2016, Pleiades Publishing, Ltd.

Kopylov Y.R.,Voronezh State Technical University
Russian Engineering Research | Year: 2016

The properties of thick steel coatings applied galvanically with mechanical action in different conditions in an electrolyte flux are investigated; the electrolyte is based on iron chloride. On the basis of the results, the utility of this process in repairing large and expensive worn components is assessed. © 2016, Allerton Press, Inc.

Kozenkov O.D.,Voronezh State Technical University
Inorganic Materials | Year: 2016

Experimental data are presented on the taper of silicon whiskers grown in an open chloride system. The whisker taper is shown to depend on the crystal growth rate, whisker radius and length, and process parameters. The experimental data are analyzed under the assumption that the size of the liquid droplet on the whisker tip decreases because of the heterogeneous chemical reaction responsible for the etching of the metallic component of the alloy. The influence of the crystal radius and vapor phase composition on the flux that leads to a decrease in the size of the liquid droplet. A model is proposed for whisker tapering as a result of the heterogeneous chemical reaction responsible for the etching of the metal on the surface of the liquid phase, and conditions for the growth of zero-taper whiskers are discussed. © 2016 Pleiades Publishing, Ltd.

Korolkov V.I.,Voronezh State Technical University
29th Congress of the International Council of the Aeronautical Sciences, ICAS 2014 | Year: 2014

The three-dimensional arrangement represents a solution of a elastic problem concerning the determination of a deflected mode of an arbitrary cross-section solid restrained bar deformation, loaded with concentrated torque at the free end.

Konovalov D.A.,Voronezh State Technical University
Journal of Engineering Physics and Thermophysics | Year: 2016

The present work seeks to develop and investigate experimentally microchannel heat-exchange apparatuses of two designs: with porous elements manufactured from titanium and copper, and also based on the matrix of filamentary silicon single crystals under operating conditions with high heat loads, unsteadiness, and nonlinear flow of the coolant. For experimental investigations, the authors have developed and manufactured a unique test bench allowing tests of the developed heat-transfer elements in unsteady operating regimes. The performed experimental investigations have made it possible to obtain criterial dependences of the heat-transfer coefficient on the Reynolds and Prandtl numbers and to refine the values of viscous and inertial coefficients. It has been established that microchannel heat-transfer elements based on silicon single crystals, which make it possible to remove a heat flux above 100 W/cm2, are the most efficient. For porous heat-transfer elements, the best result was attained for wedge-shaped copper samples. According to investigation results, the authors have considered the issues of optimization of thermal and hydraulic characteristics of the heat-transfer elements under study. In the work, the authors have given examples of practical use of the developed heat-transfer elements for cooling systems of radioelectronic equipment. © 2016 Springer Science+Business Media New York

Gridnev S.A.,Voronezh State Technical University
Ferroelectrics | Year: 2016

Nanocomposite thin films containing Pb(Zr0.53Ti0.47)O3 (PZT) and Co or Ni are deposited on pyroceramic and silicon substrates by ion-beam sputtering. Structural characterizations show that only PZT and Co or Ni phases exist in the composite films, and the crystalline Co or Ni nanogranules with average sizes of 3.0–8.0 nm are randomly embedded in the amorphous PZT matrix. The conductivity and magnetoresistance mechanisms were studied as a function of composition, temperature and magnetic field. The crystallization and structure relaxation processes in amorphous PZT were observed, and results obtained are discussed. © 2016 Taylor & Francis Group, LLC.

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