Electronics, radio engineering and telecommunications
http://old.bulletin.kpi.ua/en/taxonomy/term/42/all
enComparative Analysis of Average Risk Using the Recommended Limit Concentration of Gases Dissolved in Oil for Detecting Defects in Transformers 110 kV
http://old.bulletin.kpi.ua/en/node/2758
<p>The comparative analysis of values of average risk, which are accompanied by use of boundary values of concentration of the gases dissolved in oil recommended by known techniques, is presented in this article. For the solution of the given problem, expression for calculation of average risk taking into account laws of distributions of concentration of gases for defectless states and defective states, in conditions, when diagnostics is made on a complex of diagnostic parameters is offered.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2758" target="_blank">read more</a></p>Abramov V.B.Baklay D.M.defects recognitiondiagnosticsElectronics, radio engineering and telecommunicationsmethods of interpreting the results of chromatographic analysisShutenko O.V.the average riskthe laws of distribution of gas concentrationsthe probability of error types I and IIThu, 28 May 2015 08:49:52 +0000admin2758 at http://old.bulletin.kpi.uaThe Image Restoration Algorithms by Conventional Deconvolution
http://old.bulletin.kpi.ua/en/node/2755
<p>The modified conventional deconvolution method using discrete orthogonal transformations is proposed. The algorithms for method realization in Hadamard transformation field and in RTF basis are considered. RTF transformation is different from Fourier transformation and is the “calque” of difference methods. The main problem of algorithm realization – forming image degradation inverse matrix by symbolic method of any order of matrix forming – is solved. These algorithms for conventional deconvolution method significantly allow simplifying the computations independently of matrix order.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2755" target="_blank">read more</a></p>conventional deconvolutionElectronics, radio engineering and telecommunicationsHadamard transformationimage degradation matrixIvanyuk N.O.symbolic methodThu, 28 May 2015 08:44:48 +0000admin2755 at http://old.bulletin.kpi.uaVisualization of Surface Conduc¬tivity Distribution by Conductivity Zones Method
http://old.bulletin.kpi.ua/en/node/2701
<p>The usage of modification method for direct EIT problem solving is substantiated. The voltages on phantom contour with known current approximation of surface conductivity distribution are calculated. The classical algorithm with Newton–Raphson method for inverse EIT problem solving is shown. That is “refinement” of surface conductivities by results of analysis. The conductivity zones method to reduce the order and time of calculations is described (transition from solution of the equation with 1000 order to 16 times solving the equations with 14 order). The regularization method by A.N.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2701" target="_blank">read more</a></p>conductivityconductivity zonesdirect and inverse problemElectrical Impedance TomographyElectronics, radio engineering and telecommunicationsimage reconstructioninhomogeneityNewton–Raphson methodphantomregularization by A.M. TykhonovRybin A.I.Sushko I.O.Fri, 19 Dec 2014 11:52:38 +0000admin2701 at http://old.bulletin.kpi.uaComprehensive Analysis of the Effective Rate in Adaptive Packet Radio Networks
http://old.bulletin.kpi.ua/en/node/2413
<p>The aim of the study is to evaluate the effectiveness of joint work of physical and link layer packet radio networks with adaptive control of length of data packets in a competitive access to the radio channel. To do this, an analytical model in the form of two equations, the first of which determines the probability of successful transmission at the physical and data link layer, as a function of the intensity of the errors in the channel and protocol redundancy package format.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2413" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsVoiter A.P.Thu, 11 Sep 2014 15:39:21 +0000admin2413 at http://old.bulletin.kpi.uaStudies into the Surface Processes of Heat Transfer of Biological Objects by Thermographic Method
http://old.bulletin.kpi.ua/en/node/736
<p>In this paper, we elaborate the methods of determining the efficient heat parameters of biological objects. We study heat conduction and capacity on the surface layer of the skin cover by infrared thermography. This research is done under the standard conditions as well as under artificial restriction of blood supply aimed at determining the surface malperfusion as a factor of the pathological states</p>
Electronics, radio engineering and telecommunicationsKotovskyi V.І.Wed, 08 Sep 2010 11:12:17 +0000admin736 at http://old.bulletin.kpi.uaThe Features of Regularization Method for Solving the Electrical Impedance Tomography Inverse Problem by Zones Conductivities Method
http://old.bulletin.kpi.ua/en/node/2371
<p>The features of regularization method of ill-conditioned derivatives matrices from transfer resistances (nodal voltages) on surface zones conductivities solving the Electrical Impedance Tomography (EIT) reconstruction problems are considered. Using the proposed method allows significantly (hundreds of times) reduce the derivatives matrices orders in comparison to the classical phantom model using finite element method that noticeably simplifies the images reconstruction.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2371" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsRybin A.I.Sushko I.O.Mon, 08 Sep 2014 11:35:57 +0000admin2371 at http://old.bulletin.kpi.uaConvergence of the Fixed and Mobile Informational-Telecommunicational Platforms and Networks
http://old.bulletin.kpi.ua/en/node/2368
<p>The purpose of this work is to develop the concept of convergence of fixed and mobile information and communications platforms and networks, which provides users with a single uninterrupted service regardless of location or change of access technology allows total use of resources of mobile and fixed networks. With the implementation of this concept raises a lot competing methods and implementation technologies that need its scientific justification.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2368" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsIlchenko M.Yu.Kravchuk S.O.Mon, 08 Sep 2014 11:23:48 +0000admin2368 at http://old.bulletin.kpi.uaEigen Waves of Cross-Waveguide
http://old.bulletin.kpi.ua/en/node/2161
<p>The purpose of the article is to obtain the algorithms for calculating the characteristics of its own waves in the cross waveguide cross and demonstrate their abilities. We solve the boundary value problem by the mode matching method. By employing the moment method functional equations arising from the boundary conditions are reduced to systems of homogeneous linear equations (SLE), whose order is equal to where M and N are number of terms in schedules of the fields in subfields specified below.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2161" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsNaidenko V.I.Tue, 01 Oct 2013 07:13:41 +0000Sveta2161 at http://old.bulletin.kpi.uaApplication of Nonreciprocal Electric Circuits with Passive Components
http://old.bulletin.kpi.ua/en/node/2158
<p>This paper describes the method of recording nonreciprocal passive multipoles containing gyrotropic medium with analysis of linear lumped electric circuits. Nonreciprocal passive devices are designed for meter and decameter wave ranges on the basis of nonreciprocal effects of helicon waves propagation in magnetized solid-state plasma. The base element for nonreciprocal passive devices is nonreciprocal transformer containing a helicon resonator.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2158" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsVountesmery Yu.V.Tue, 01 Oct 2013 06:56:50 +0000Sveta2158 at http://old.bulletin.kpi.uaSimulation of Ionization and Emission Processes in the High-Voltage Electron-ion System with Cold Cathode and Pulse Ion Generator
http://old.bulletin.kpi.ua/en/node/2089
<p>This paper develops the mathematical model of high-voltage low pressure electron-ion system with a cold cathode and a pulse plasma ion generator disposed behind an anode. The model is based on kinetic equations describing time dynamics of ionization processes in the plane electrode gap with participation of electrons, ions and neutral species after ion charge exchange, as well as electrode emission processes, including reflection of atoms from cathode and electrons from anode.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2089" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsKuzmichev A.I.Fri, 09 Aug 2013 12:00:39 +0000Sveta2089 at http://old.bulletin.kpi.uaSpeech Corpora as Facilities of Creation and Storage of Exemplary Speech Signals
http://old.bulletin.kpi.ua/en/node/2092
<p>Speech corpora are an important constituent of modern investigators’ toolkit in such areas as speech correction, designing and testing elements of telecommunication systems and systems of automatic speech recognition. In this paper, we search for elements of construction technology of the sound part of noisy Ukrainian speech corpora. To this end, we consider characteristics of the most wiely used modern noisy speech corpora which allow formulating principles of such corpora design.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2092" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsProdeus A.M.Fri, 09 Aug 2013 12:28:36 +0000Sveta2092 at http://old.bulletin.kpi.uaDefining Parameters of Quality Mobile Network Technology LTE/MVNO with Tensor Analysis
http://old.bulletin.kpi.ua/en/node/2095
<p>The paper under scrutiny proposes the sequence of actions for characterizing the quality parameters of the mobile network LTE/MVNO for convenient configuration of network connections of objects. To determine the quality parameters of the network LTE/MVNO tensor decomposition of the network architecture we employ the method for obtaining the optimal configuration of the network connections of objects for preset values of packet delay using the criterion of the maximum capacity.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2095" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsGutsal Ju.V.Solovskaya I.N.Strelkovskaya I.V.Fri, 09 Aug 2013 12:56:22 +0000Sveta2095 at http://old.bulletin.kpi.uaPeriodical Structure with Transversal Electric Field
http://old.bulletin.kpi.ua/en/node/2026
<p>In this paper, we solve the problem of electromagnetic wave propagation in a periodic structure with a transverse electric field in the baseband. The period of the structure is divided into two subregions by planes perpendicular to the longitudinal coordinate. We use the method of partial regions. By employing the moments method, the system of functional equations obtained from the boundary conditions and periodicity conditions is reduced to a system of linear algebraic equations (SLAE), whose order is M and N, the number of terms in the fields expansion in the sub-areas. </p>
Electronics, radio engineering and telecommunicationsNaidenko V.I.Fri, 17 May 2013 11:35:59 +0000Sveta2026 at http://old.bulletin.kpi.uaThe Effect of Packets Length Management Strategies on the Efficiency of the MAC Level Packet in Switched Radio Networks
http://old.bulletin.kpi.ua/en/node/2023
<p>The paper studies a new method of efficiency enhancement of packet switched radio networks at the radio channel access level. To this end, we consider the known strategies of packet lengths control in such radio networks and reveal incompleteness of a possible set of packet lengths management with channel conditions under carrier sense multiple access (CSMA) protocol. We propose three new strategies to change packet lengths which complete the set. Mathematical simulation is conducted for persistent and nonpersistent CSMA protocols.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/2023" target="_blank">read more</a></p>Electronics, radio engineering and telecommunicationsVoiter A.P.Fri, 17 May 2013 11:27:02 +0000Sveta2023 at http://old.bulletin.kpi.uaThe Research of Instability of the Amplitude Frequency Characteristic of a High-Voltage Potential Divider Caused by Non-Identical Elements of its High-Voltage Shoulder
http://old.bulletin.kpi.ua/en/node/1966
<p>Based on repeated measurements, we define real distribution of capacity values of condensers of a high-voltage shoulder of a potential divider with the assumed deviation from the nominal equal to ±5%. We show that the given distribution is asymmetric in relation to rating value (22nF). Renormalization of received distribution was done in relation to the average capacity value of condensers. We investigate the influence of real distribution of condensers capacities on instability of the amplitude frequency characteristic (AFC) of a high-voltage potential divider.</p>
<p><a href="http://old.bulletin.kpi.ua/en/node/1966" target="_blank">read more</a></p>Atarod SorooshBrjezitskiy V.О.Electronics, radio engineering and telecommunicationsWed, 08 May 2013 08:07:33 +0000Sveta1966 at http://old.bulletin.kpi.ua