Vol 17, No 2 (2019)

The calculation of a series of matrices of electrostatic induction coefficients of a multiconductor transmission line by the method of moments is presented. To calculate the matrix in the range of dielectric permittivity, the hybrid method for solving a system of linear algebraic equations is proposed. The method is distinguished by the use of the block LU decomposition with the first matrix calculation using the direct method of linear system solution while the subsequent matrices are calculated by the iterative method. Computational evaluation is obtained using several mathematical packages and compared with analytical ones. The analysis of the test structure shows the prospects of the developed method.

The paper considers the possibilities of capturing optical energy by planar optically active media (crystal). When an infrared optical wave is incident on an optically active medium with the property of chirality, it is possible to transform radially incident radiation into azimuthal scattering along a planar structure. The problem of an oblique incidence of an electromagnetic wave on an optically active crystal is considered. It is shown that tensor material equations for optically active crystal can be reduced to material equations of scalar type with the insertion of the relative parameter optical activity of a crystal. The problem of the incidence of an electromagnetic wave on an optically active crystal was solved by the method of partial regions. At the frst stage, the electromagnetic feld in an optically active media and in its surrounding areas was determined. At the second stage, after applying the boundary conditions, an inhomogeneous system of linear algebraic equations was obtained about unknown refection and passage coefcients. In this work, two types of the structure were considered: the optically active crystal, located on a dielectric substrate and the optically active crystal, located on an ideally conducting substrate. The dispersion of the refractive index and the parameter of the optical activity of the optically active crystal were taken into account. Minimizing the modules of refection and passage coefcients by selecting the geometric dimensions of the optically active crystal was the main purpose. As a result, the parameters of the crystal were selected, in which the efect of azimuthal scattering of incident emitting is predominant over classic Fresnel scattering. In this case, the researching optical structures based on optically active crystal can perform the function of capturing the optical emitting of the infrared range by concentrating a part of the light energy inside the optically active crystal.

The problem of determining characteristics of a queuing system (QS) produced by two flows with displaced exponential distributions is considered. Such a system is considered for the first time. For the classical M/M/1 system the coefficients of variation of the input flow intervals and the service time are equal to one, and for the new system they become less than one and we get a non-Markov queueing model of G/G/1 type. By varying the time displaced parameter in the input distributions, it is possible to change the values of the variation coefficients of the arrival intervals and the service time. Thus, the displaced exponential distributions widen the range of the arrival time variation coefficients and service time, thereby expanding the scope of the new queuing system. The problem is solved by the classical method of queuing theory - the method of spectral decomposition of the solution of the Lindley integral equation. It is shown that the load in such a system is higher than in the classical M/M/1 system, and the average waiting time is shorter because of reduced variation coefficients of the intervals between the receipt and the service time. It is known that the average waiting time is related to the coefficients of variation by a quadratic dependence. Thus, the article presents a solution for the new G/G/1 system. The possible applications for this new QS have yet to be assessed.

In the second part of the article the authors focused on the statistical study of the “Construction of prefabricated buildings” business process, the description and scheme of which has been presented in the first part. In the context of statistical simulation, the business process was analyzed and the main random factors affecting the process were identified. Then, in terms of probability theory and mathematical statistics, random variables describing these factors are determined. There was found that all random variables can be approximated by one of the three laws of distribution - normal, exponential and Poisson. Based on the identification of random variables, there was obtained a list of parameters and variables of the model, the values of which can be further changed by the user working with model online. A generalized scheme of the modeling algorithm is presented then.

Algorithms for searching and extracting images of state vehicle license plates from video sequences are discussed. The most common is the search algorithm, in which the image of licence plate is considered as a connected closed foreground area with the specified sizes. This algorithm uses the edge detector Kanny to select the boundaries of objects. The use of this algorithm leads to errors with poor image quality. Errors are manifested in the presence of significant boundary breaks around the license plate. The use of morphological processing methods to eliminate errors leads to the complexity of the algorithm. The algorithm proposed by the authors does not search for the number plate, but directly for the symbols of the state license plate, which are then used to localize the location of the number plate in the image. In this case, the object of interest is considered as a chain of symbols with known characteristic features. At the first stage, the applicant areas for symbols of the licence plate are found. At the second stage, a mask is formed to select the image of the licence plate. The results of modeling algorithms using MATLAB are given.

In general, any steganography system uses two signals - a hidden signal and a container signal. The process of signal recovery requires the receiving party to know the signal from the container. If we represent the transmitted signal as two components, each of which is a function of two signals, then the process of recovering the hidden signal does not require the receiver to know the signal from the container. This article discusses the system in which both signals are informational, and in each component, the two signals are mixed in accordance with a specific algorithm. An important task of designing a steganographic system is the selection of a key. The main requirement for the key is to ensure consistently high sensitivity of the system to the key variation, and, accordingly, to the minimum change of this sensitivity during the formation of the container. The article provides an analysis of a two - component steganographic system from the point of view of sensitivity to variations of various parameters and values of the embedded signals. The conclusions are made about the obtained result.

In the process of forming the digital economy in Russia, the approach associated with the creation of «growth points» to stimulate economic growth and create a favorable innovation climate in the regions is very much in demand. It involves the creation of agglomerations, which will concentrate innovation, resources, infrastructure and «human capital». «Smart cities» projects include purposeful work for the creation of a new urban environment. The priority areas are the use of «big data», sensory technologies for collecting information, the widespread use of resource - saving technologies, active interaction between authorities, public structures and citizens in the management process, the development of political «civic culture» and local self - government, the formation of a new educational system aimed at the development of «soft» skills. The advantages of «smart cities» are associated with the achievement of a high level of socio - economic development and improvement of the management system. The key risks of digital society in Russia are insufficient management efficiency, lack of competencies to create competitive services and production facilities, threats to security in the Internet space, and unwillingness of Russian society to fully participating in the «digital» reality.