Vol 19, No 3 (2011)

Problems of data in information systems analysis. Based on the synthesis of framing and production models the formation of the formal apparatus of knowledge-development projects, road and transport infrastructure is presented.

In article the synthesis of the time-optimal open-loop regulator for Dubins car is considered. In assessing the quality of decisions the total time for the task of transferring the object at a given point is taken into account, including the time for calculating the control program and the time of moving the object to the goal. We consider some options for the numerical determination of the regulator as an imperative model of a system of rules like "condition - action". Advantages of anytime genetic algorithm at the decision of the time-optimal problem for Dubins car are shown.

In article the approach to optimization of technological process of preparation manufacture preparations an aviation specialized complex is considered. The known method of the factor analysis-method of principal components is for this purpose used.

This article refers to constructing the system of the nonlinear algebraic equations describing streams on branches and units of a network in a stationary mode while transferring packages on a transport highway of a communication network. The decision of system allows calculating time delays and probabilities of packages losses between each pair units of a network, and also streams on branches and units of a network, a delay, probability of blocking and levels of loadings of channels.

This article discusses technique of stitching strips of images obtained by air-borne multimatrix scanning optical-electronic converters. The algorithms that implement the method, are characterized by high accuracy and fast-action. The algorithms based on the method of functionalization of image parameters.

The paper dwells on the structure of the correlation and extremum control and navigation unit working from targeting devices of the remote sensing system, and sets out algorithms of the system functioning in the carrier control loop. Outcomes of mathematical modeling and experimental tests are described.

The paper describes the methods of investigation of electromagnetic interference effects, caused in the lines connecting the differential transmitter and the measuring chain, based on the generalized signal graphs. The author also gives the recommendations in the topology of the measuring chains which minimize the interference. The article shows the usability of signal graphs for analysis of the noise effect for various types of parametric differential sensors.

Making investigations of metallographic characteristics, chemistry, hardness of basic material and silver cover of drill bit's thrust collar.

Analytical and theoretical verification of the hypothesis of a significant effect on the fatigue strength of thin-walled concrete elements of building structures, which is relatively weak dynamic effects of different origin (wind, acoustic, seismic, etc.) is performed. The destruction of the elements seen as a process of structural defects in concrete. A computational model for determining the endurance limit of elements of a particular configuration is proposed.

In this paper the application of range diagram method of overshoots and dips of reactive termination graphic chart for power selection of unregulated and regulated parts of the compensating device is presented.

The article presents an assessment of the frequency arrangement of arresters on overhead lines and determined the effect of various parameters of the line for "protection zone" limiters.

The paper proposes the special inductor construction for a heating a definite part of a gas turbine engine disc rim in procedure of thermoplastic reinforcement. Standardizing function of a sources of heat in an inductor heating zone given with the new inductor construction. Optimal algorithm of a one-stage heating control with a restriction on the maximum temperature is found.

The article describes the synthesis of cutting force stabilization system with a random disturbance. The transfer function of the optimal force regulator was determined in a research process.

Inverse heat conductivity problem with identifiable inside heat emission function , formulated in the extremal statement is considered as an optimal control process with distributed parameters. Search control actions carried out on the set of continuous and continuously differentiable or twice continuously differentiable functions. Using the parameterization of control actions, the problem reduces to a special problem of mathematical programming, whose solution is based on a method that takes into account alternance properties desired extremals.

The article describes a mechanism to reduce the performance of pipelines with oil heating stations (so-called «hot» piping), that transport solidifying paraffin oil. Temporary disconnection of oil heating may not only lead to an increase in oil viscosity, but also can create conditions for the emergence and strengthening of thixotropic structural lattice in paraffin oil. This leads to an intense increase in the viscosity in the area of Newtonian flow of the oil. Decreasing performance of centrifugal pumps contributes to even greater increase in viscosity and finally to a complete stop of oil flow.Examples of the «spontaneous» stop of real «hot» pipelines are listed.

The new approach to the technology of enantioselective addition of diethyl malonate to nitrostyrene as key stage of obtaining of some fine organic synthesis intermediates is offered. It is shown that process can be carried out at a transition metal catalysis with high enantiomere excess of addition product.

The article describes main concepts of ads management in Internet, main approaches for Internet ads optimization and main requirements for automation of optimization process of Internet ads.

Stabilization system of polymer melt pressure in the single-screw extruder dosing zone in respect of real perturbations with a pulsating pressure gradient is synthesized, which provides required cable quality as a communication channel taking into account the bandwidth.

The article deals with the management of regional water supply program in the preliminary analysis and calculation of investment. Intelligent decision support system, which generates alternative technological schemes of water supply projects in the program, is proposed.