Information and communication technologies

Theoretical study of intermodulation distortion in nonlinear power amplifier has been done. It relates to a generation of second harmonics of input signal and allowed to present a new linearization principle of these devices, which is based on use of mentioned harmonics energy as a feedback signal. Calculations of impact of described mechanism upon signals of different digital modulation types have been conducted. Significant reduce (up to 25 dB) in crosstalk level has been reached. And 1dB compression level of amplifier output power has almost reached saturation point.

New methods of creating optimization and control coordinating systems are worked out.

Namely:

The method of synthesis of multidimensional coordinating control systems with multirate sampling in a deterministic environment based on optimality multirate criteria in a form of reference models of digital control closed circuits. The method provides increasing control accuracy of output coordinates specified ratio in the transition regime in more than 10 times.

The analysis and theoretical-methodological grounding of mathematical models and numerical methods research lithodynamic processes of the earth surface on PEСM. Due to the great complexity and cumbersome computations to determine the stability coefficients of sliding slopes using variational methods for determining the sliding surfaces is possible only with the full computerization of such calculations.

Methodological, mathematical and algorithmic toolkit worked out to provide a guaranteed functioning of complex technical systems (CTS), an opportunity to form sufficiently informed decision based on the threshold time limit, the practical implementation of solutions to prevent accidents and disasters in terms of conceptual uncertainty and multifactor risks. Toolkit in the form of an information platform of technical diagnostics in real time is based on the proposed control strategy serviceability and safety of the CTS.

A new two-stage method for intellectual data analysis is proposed that combines Bayesian networks theory and regression analysis. The method is based on two sets of mathematical techniques. The first one is used for constructing topology of Bayesian network and forming probabilistic inference. The inference is used further on for decision making on the basis of forecast estimates. The second set of methods is used for development of regression model with making use of logistic link function that serves as a basis for forecast estimation.

In the work the original technology for web-services development and deployment was created. Also the platform for efficient web-services execution and provision of services using web-services and high performance computing technologies was designed. The integrated system approach on the base of model-driven architecture approach modification was proposed. The approach allows shortening the development time and errors number in designed multicomponent distributed software suites and also organizing of high-performance environment using nondedicated computer equipment.

The essence of the design is to create the remote access system of user to the means his own work cabinet with implementing the clouds computing services and providing the virtual presence effect.

Рrovide by that the possibility for executing in remote mode on the server the applications executing in local real cabinet. Рrovide access from virtual personal cabinet (VPC) in local and remote mode to the clouds services. These are SaaS – access to the software, PaaS – access to the virtual computers, IaaS – creating and control of the information Infrastructure.

Authors have developed a new technology to create of tools for integration of distributed information systems (IS) on the basis of standardized components to the dynamic interpretation of metamodels processing and management. Technology differs from the known methods that can be adapted to each other and IS dynamically modify their treatment processes and software components.

The methods for implementation the group operations for finite groups of arbitrary order and operations in finite fields with given characteristic in linear logic networks, which implementation oriented on programmable logic integrated circuits (FPGAs) are proposed and investigated. A list and the basic properties of group operations for groups of order 2n, which are implemented by regular logic networks of linear complexity for all values of n are defined.

The new technology of deposition of nanoscale (20-50 nm) ferroelectric films (NFF) for the non-volatile memory elements (ME), including the method of RF magnetron sputtering with closed drift of high-energy secondary electrons. Processed using the method and means of RF sputtering plazma monolithic ceramic targets based compounds zirconium, titanium, lead in the direction of reducing the thickness of the film, the technology of ultrasound treatment NFF, which provides an increase in the polarization reorientation and reduction of stress reversal.