THE USE OF MULTI-CRITERIA APPROACH IN THE ANALYSIS OF ALTERNATIVE ENERGY SOURCES
A. P. Preobrazhensky
This paper is devoted to consideration of the objectives related to the optimal choice of parameters controlled in the systems of electric power generation. We discuss the possibilities for the application of the main criterion for the case of multicriteria optimization of the process of electricity generation based on alternative sources. Refers to the need to focus on the Pareto set. Indicated that one of the solutions to a multicriteria problem can be a combination of goal programming, and narrowing the scope of trade-offs involving data, what is the relative importance of the criteria. The use of simplifications when there is a formation of Pareto-optimal solutions for specific processes of power generation based on alternative sources can be considered as an important task, to ensure that its consideration has been reduced and time costs to a reasonable level.
Keywords: optimization, renewable energy, multicriteria approach, function, method, algorithm, parameter.
CHARACTERISTICS OF MATHEMATICAL SOFTWARE RADIO COMMUNICATION
T.V. Glotova, H.I.Besher
This paper discusses the features of the methods used to assess the propagation characteristics of radio waves in modern radio systems. Parameters affecting the accuracy and the computation time of radio signal propagation in certain areas. It is noted, as a preliminary evaluation of the characteristics as there is a large error in calculations, the use of statistical approaches. More acceptable from the point of view of practical use give radiation methods, different variants of which is given. It is noted the feasibility of a combination of several methods, such as adding to the main model approaches based on artificial intelligence.
Keywords: radio communications, wave propagation, mathematical software, method, design.
A HYBRID METHOD FOR CALCULATION OF SCATTERING CHARACTERISTICS OF OBJECTS ABOVE A ROUGH SURFACE
An iterative hybrid method is considered combining the Kirchhoff approximation and the multilevel fast multipole algorithm (MLFMA) is studied for electromagnetic scattering from three-dimensional (3-D) object above a two-dimensional (2-D) random dielectric rough surface. In order to reduce computational costs, some types of speed calculations were used. First, it is used to speed up calculations of electromagnetic field in far field approximation (FAFFA) of the process of interaction between the rough surface and the object. Secondly, based on the mechanism of scattering on a rough surface, and derived a rule for moderately rough surface bistatic scattering, which can further increase the speed of iteration. Compared with traditional methods, a hybrid the method of procedure is sufficient for analysis scattering of 3-D object above random rough surfaces.
Keywords: scattering of electromagnetic waves, method, hybrid method, modelling,
THE PROPERTIES OF METHODS OF ESTIMATION OF SCATTERING CHARACTERISTICS OF ELECTROMAGNETIC WAVES
O.A. Boluchevskaya, O.N.Gorbenko
The paper is devoted to modern methods of calculating the characteristics of electro-magnetic waves. The peculiarities of the solutions of the tasks to different frequency areas are pointed out.
Keywords: scattering, waves, method.
THE PROBLEMS OF RECOGNITION OF SPEECH SIGNALS
In this paper, the analysis of the main issues associated with recognition of speech signals is given. The classification of systems of recognition, methods of speech recognition is presented.
Keywords: recognition, speech, language, method.
THE POSSIBILITIES FOR INCREASING THE EFFICIENCY OF SOLVING PROBLEMS WHEN DESIGNING WIRELESS NETWORKS
The paper examines approaches for optimizing the solution of the problems for wireless networks. The analysis of methods of optimization, indicated their advantages and disadvantages, the problems are listed in which these optimization methods can be used.
Keywords: wireless network, optimization, method, diffraction, scattering.
THE PREDICTION OF THE SCATTERING CHARACTERISTICS OF THE COMPOSITE METAL CYLINDER
Y.A.Mishin, A.G.Sklyar, D.V.Rusanov
TThe analysis of methods of predicting dynamic characteristics is given. We consider the problem of predicting the scattering characteristics of metal composite cylinder. The results of the evaluation of the range of wavelengths to predict depending on the size of the base of the cylinder is considered
Keywords: : electrodynamics, forecasting, scattering, model, method, wave.
THE STUDY OF THE CHARACTERISTICS OF PROPAGATION OF ELECTROMAGNETIC WAVES IN THE INTERNAL AREAS INDOORS
E.S.Zatsepin, A.G.Sklyar, D.V.Rusanov
In the paper we consider the problem of propagation of electromagnetic waves in the internal area of the premises. Based on the analysis of possible approaches to solving this task the experimental method was chosen. The results obtained for different variants of propagation of electromagnetic waves through different environments were obtained. The structure of subsystem of data processing in the study of the propagation of the radio waves in the room was proposed.
Keywords: : wireless communication, experiment, method, optimization, method, coverage, approximation.
THE SIMULATION OF RADIO WAVE PROPAGATION IN MOBILE COMMUNICATION SYSTEMS
E.S.Zatsepin, A.G.Sklyar, D.V.Rusanov
In the paper we considering the simulation of the propagation of electromagnetic waves of cellular communication systems in the city. On the basis of the corresponding transmission channel as well as optimization techniques a possible reflections of the rays during propagation along streets are found. The values of attenuation at different distances from mobile base stations are calculated.
Keywords: : communication, simulation, radiation method, optimization, method, coverage area.
THE USER AUTHENTICATION IN THE INFORMATION SYSTEM BY MEANS OF A HANDWRITTEN SIGNATURE
The paper discusses the problems associated with users authentication on the basis of their signatures. The basic methods of recognition of such objects are pointed out. The structure of the module for recognition of a handwritten signature is given.
Keywords: : authentication, signature, recognition, system, algorithm, method.