A classification of errors in information vectors of systematic codes is proposed. The classification allows to account all the possible variants of information distortion and enables investigation of abilities of various systematic codes in the error detection. Applications of the approach to development of reliable automation systems and computer technique are discussed.

A variant of symmetric knapsack cryptosystem with packing density above one is proposed. The latter feature makes the system resistant to L3-attack with polynomial speed characteristic developed by Lagarias and Odlyzko. The proposed algorithms of encryption and decoding are based on shared memory protocols and use Fibonacci-type basis.

Two simple solutions to the problem of adaptive state-feedback control are proposed for a class of time-variant linear objects. State matrix is presented in the low triangular form. The control design is based on standard pole placement approach with variable average radius of roots distribution. The radius is generated by robust adaptation algorithm in the first solution and by nonlinear static feedback in the second one. The control provides the boundedness of all signals in the closed-loop system and exponential convergence of the object output signal to output signal of reference model.

An algorithm is proposed for synthesis of binary sequence applicable for forming inverse-conjugate scale code track information pattern. Application of the algorithm in a multithreading mode operating program is reported to reduce significantly the computation time due to the fact that synthesis of individual sequence and distinguishability test of code combinations are not connected. It is noted that inverseconjugate binary sequences may be used for development of 4-, 5- and 6-bit inverse-conjugate code scales, as well as of 8—16-bit pseudo-regular code scales.

Based on analytical estimates of spacecraft autonomous navigation accuracy, a method is proposed for determination of requirements on accuracy of complementary measuring means of spacecraft adaptive on-board information and measuring complex operating under exposure to cosmic space disturbing factors.

The boundary value problem describing adequately the stationary gain modes of р—n—р- and n—р—n-bipolar transistors in a wide range of the collector current density is formulated and solved. Expressions for current gain, as well as for injection efficiency, minority carriers transfer coefficient at high injection levels in the basic areas of bipolar transistor are derived and analyzed. The basic physical mechanisms responsible for increase as well as for decrease in gain with increased collector current from the lowest possible up to the maximal allowable values are considered. Comparative analysis of the obtained theoretical results with experiments data is presented.

A conceptual model of modern surveillance system with prediction unit for premises security alarm is presented. The prediction unit consists of automatic sniper rifle system and special equipment for target location (e.g., unmanned aerial vehicle or three-coordinate designator). Sniper rifle system is distance controlled. Aiming corrections data are set automatically.

Properties of a fiber optic optoacoustic converter (FOAC) of IR pulsed diode laser radiation into acoustical energy are studied. The FOAC is devised in two steps on the end of quartz fiber used for transfer of the laser radiation, and generates a directed stream of microbubbles when placed in the water. Application of the FOAC for cleaning a solid surface of adsorbed material is considered. Data obtained with scanning electron microscopy and X-ray structural analysis of the converter composition are presented as well as results of the converter optical transmission measurements and high-speed shooting of its operation. Acoustic signals generated by the converter in the water under exposure to laser radiation (λ=980±10 nm) are recorded.

A two-wavelength method for accurate calibration of high-precision Sun photometers is proposed. The graphical analytical technique of Langley diagrams is considered as a functional analogue. It is shown, that despite the symmetry of the Bouger — Beer law mathematical formula with respect to optical air mass and optical depth of aerosol, development of Langley diagrams with mutual substitution of these parameters is impossible. An algorithm realizing the proposed method is presented.

The possibilities of using modern computer-added design systems in manufacturing of compact non-standard gears from polymer composite materials are considered. An algorithm is proposed for preproduction computer simulation and visualization of the manufacturing process. Application of the algorithm to manufacturing of two types of non-standard gears is analyzed. Perspectives of implementation of the proposed approach are discussed.

Advantages and disadvantages of rapid prototyping technology of electronic means are analyzed. The use of CAD systems is suggested for generating 3D-models of electronic means in STL format. A comparative analysis of rapid prototyping methods is carried out, recommendations on application of the methods to printed circuit boards, assemblies, and units manufacturing are formulated.

Methods and means for preventive maintenance of eye accommodation ability and visual acuity are described.