An electro-hydraulic system with a fourth-order astatic control object containing lag and oscillatory elements is considered. The results of mathematical modeling of an optimal digital controller for this system are presented.
Analytical expressions for digital controller transfer function coefficients via control object parameters and time step are obtained. System performance is verified by mathematical simulation.

The issues of computer technology creation of 3D-design and engineering analysis of metal forming processes using cross wedge rolling methods (CWR) are considered. The developed software for computer-aided design and simulation of cross-wedge rolling is described.

The problem on equilibrium shapes and stability of axially symmetric liquid bridge between the end faces of two coaxial vertical cylinders of equal radius in gravitational field is considered. A scheme of spline type for numerical solving of the problem is developed. Construction of the scheme is based on an approximation of the free surface by parametric cubic splines which exactly satisfy equations of the differential problem at grid nodes. Equilibrium free-surface shapes in a wide range of problem parameters are obtained. Critical values of the bridge height corresponding to the loss of equilibrium stability depending on the Bond number are determined.

A variant of monitoring problem formalization on the basis of the decision theory is considered. The models of heterogeneous environment and mobile heterogeneous object are offered as a structuralinformative basis for solving typical monitoring tasks, including identification, supervision, evaluation, synthesis of control decisions and prognosis. The models aim at practical application and implementation in any modern object-oriented programming language.

Assembly line balancing problems with imprecise input data (durations of assembly operations, number of workstations) are considered. Problem settings with deterministic, stochastic, and uncertain parameters are discussed. Different approaches to the assembly line balancing problems with imprecise durations of assembly operations are analyzed. A new problem setting is proposed in which durations of assembly operations are given by lower and upper bounds of their possible values.

A technique of marker set construction for muscle MRI segmentation using random walker approach is introduced. The possibility of clinician’s manual labor amount reduction and random walker algorithm optimization is studied.

The purpose of this paper is to present the results of an exploratory study of possible correlations between the drug resistance and the structural features of CT and X-ray images of lungtuberculosis patients. A multi-step procedure is suggested which includes calculation of textural image features, extracting their principal components, correlating them to patients’ clinical data and mapping the significant principal components back to image descriptor elements and then to the corresponding image structures they found to be linked with. The results of a detailed statistical analysis of the revealed links between the drug resistance and the image features are presented. The analysis includes finding
one-factor correlations, performing multivariate regression analysis and cross-validation.

The purpose of this paper is to introduce a robust framework to facilitate simultaneous detection and segmentation of objects with arbitrary size and shape on different kinds of medical images using a library of arbitrary irregular smooth shapes.

An algorithm for determination of the degree of phonogram matching on the basis of linear spectral frequency and dynamic time warping is considered. The problem of phonogram comparison is handled as the problem of recognizing the analyzed speech signal, which contains a lot of distortion and noise with unknown beginning and duration, non-linear timescale, and unknown pronunciation sample. A functional diagram of the algorithm is presented.

The paper deals with the Markov chain of conditional order, which is used for statistical
testing of cryptographic generators. Statistical estimations of model parameters are given. Consistency of the order estimator is proved. Results of computer experiments are presented.

Processing time and hardware requirements of hardware implementation of 8 algorithms of national standard of the Republic Belarus based on FPGA microchips are provided. The results of algorithms implementation on the platform of Spartan 3 and Virtex 4 microcircuits are considered.

A problem of synthesis of multi-level logical networks using CMOS VLSI cell library is considered. The networks are optimized with respect to the die size and average dissipated power by CMOS-circuit implemented on a VLSI chip. The suggested approach is based on covering multilevel gate network and on taking into account specific features of the CMOS cell basis.

A computer program is described which analyzes the decomposability of a system of Boolean functions and searches for an appropriate partition of the argument set. Three tasks linked with a system of Boolean functions are given: producing all solutions, searching for the best solution from the circuit complexity point of view, and finding a solution as quickly as possible, if the system is decomposable. The results of computer experiment for determining decomposability of systems of Boolean functions are given.

An improvement of the method by J.C.S. Jacques, C.R. Jung and S.R. Musse for background removal and video sequences shadow detection is proposed.