# Computer Sciences

## Analyticity Conditions of Characteristic and Disturbing Quasipolynomials of Hybrid Dynamical Systems

Hybrid dynamical systems (HDS) are connected by means of the boundary conditions and the constraint’s conditions systems of ordinary differential equations and partial differential equations with the corresponding initial conditions. Check the stability of HDS can be performed on the basis of the "fast"algorithm for the application which requires analytic characteristic and disturbing quasipolynomials of HDS in the right half-plane and near the imaginary axis.

## An Approach to Fuzzy Modeling of Digital Devices

In the article the problem of fuzzy binary logic modeling for digital devices (DD) is investigated. In contrast to the similar classic problem of logical simulation, it is assumed that inputs signals of DD are fuzzy signals. In the real of DD for each input (0 or 1) there is a certain voltage range. If an input signal is out of the range, the correct signal identification is not guaranteed. The fuzziness of input signals means that there observed values can be either within of the defined range, or out of it.

## Quantum Computers and Quantum Algorithms. Part 2. Quantum Algorithms

The paper discusses principles of construction for quantum algorithms and their main features. Distinction of quantum parallelism from classical methods of high-performance computing is shown. Quantum algorithms design strategy is presented based on quantum circuits. Methods of programming for implementation of quantum algorithms using high-level languages are proposed. An approach to implement unitary transformations based on the oracle method is described.

## Algebraic Properties of Abstract Neural Network

The modern level of neuroinformatics allows to use artificial neural networks for the solution of various applied problems. However many neural network methods put into practice have no strict formal mathematical substantiation, being heuristic algorithms. It imposes certain restrictions on development of neural network methods of the solution of problems. At the same time there is a wide class of mathematical models which are well studied within such disciplines as theory of abstract algebras, graph theory, automata theory.

## Quantum Computers and Quantum Algorithms. Part 1. Quantum Computers

The paper presents the principles of operation of quantum computers. Competitive advantages of quantum computing are shown and some variants of a construction of an ideal quantum computer proposed. We analyze also the computational process in a quantum computer from the point of view of the complexity of algorithms. Implementation of nodes of a quantum computer is exemplified based on quantum communication schemes. The operation of Bloch sphere and visualization of the state of the qubit are described. Major obstacles to the creation of quantum computers are considered.

## The Development of Software Components for Streaming Audio Content Filtering Through the Use of Hidden Markov Models

The results of the development of efficient algorithms for streaming voice recognition using stochastic models based on the use of hidden Markov models are shown in this work. The article provides basic theoretical information for the hidden Markov model of the discrete system and the necessary parameters to define it are distinguished. Also there are three main tasks considered that need to be solved for the successful application of hidden Markov models in speech recognition systems.

## T-irreducible Extensions for Starlike Trees

We deal with a sort of optimal extensions of graphs, so called T-irreducible extensions. T-irreducible extension of a graph G is an extension of G obtained by removing a maximal set of edges from the trivial extension of G. A difficult starlike tree is a starlike tree that has at least one difficult node. T-irreducible extensions for nondifficult starlike trees were constructed by M. B. Abrosimov, T-irreducible extensions for palms (one of subclasses of starlike trees) were constructed by S. G. Kurnosova.

## Reconstruction of a Labeled Graph by a Graph-walking Mobile Agent

The problem of construction of graph-like operational environment by a mobile agent is considered. The model of environment is defined as a simple undirected vertex labeled graph. We propose a polynomial time algorithm of graph reconstruction and labeling for the collective consisting of agent-explorer and agent-supervisor.

## Parallelization of Parametric Synthesis by «Problems Portfolio» Scheme Based on MPI Technology

We propose a prototype of a parallelization scheme «problems portfolio» by standard means of MPI technology with application to problems of parametric synthesis of controlled hybrid dynamical systems. Parametric synthesis of the stabilization system of a controlled mobile object was performed. Efficiency of the proposed algorithm of dynamical balancing of computational load is shown.

## Principal Ideals in the Congruence Semilattice of a Path

It is proven that principal ideals generated by congruences of a path having the same type are isomorphic lattices. The number of elements, atoms and coatoms is found for the principal ideal generated by a given congruence of a path.