This article examines the structures of one of the types of pyramidal networks - parallel-hierarchical networks. The presented material has a dual purpose - applied and cognitive. The first one is of great importance in increasing the "intelligence" of specialized computer tools using a bionic approach. The second one opens completely new possibilities for a deeper understanding of the structure of the brain from the perspective of the cybernetic approach.
Acceptable errors of eye optical system parameters preoperative biometrics are substantiated. It allows to determine intraocular lens (IOL) optical power with the accuracy that provides the error of planned postoperative refraction within ±0.25 diopters. It was found that depending on the location of the IOL in the patient's eye, allowable error in determining the required IOL optical power for emetropic postoperative refraction is from ±0.3 to ±0.42 diopters, and for the average eye optical system is within ±0.337 diopters. It is shown that allowable error in determining the required optical power of the implanted IOL is provided if geometric parameters of aphakia eye – the average radius of cornea curvature, the IOL location in the eye and the focal length of the virtual paraxial component, are measured with the same permissible errors ±0.055 mm.
The article deals with changes in the amplitude-frequency spectrum of blood flow fluctuations in the perioperative period in patients with adhesive intestinal obstruction using computer diagnostics. To study the state of the microcirculatory bed and the mechanisms of its regulation, laser Doppler flowmetry was performed. Available results indicate significant changes at the level of the microcirculation system. Violation of blood circulation of tissues and decrease in body temperature at the end of surgery leads to hypoxia of organs and systems of the body, their dysfunction, and subsequently, insufficient functioning of the parenchymal organs and the development of complications.
The paper studies a frequency transducer of the gas concentration for detection of Helicobacter Pylori strains based on the MOSFET-bipolar transistor structure with a negative differential resistance and a highly sensitive NH3 sensor. A dynamic mathematical model of the frequency transducer of gas concentration has been developed using the state variable method which makes it possible to determinate the value of voltage or current at any point of the circuit at any particular time when the gas concentration is changed. Analytical expressions for transfer function and sensitivity equation have been obtained on the basis of the nonlinear equivalent circuit of the frequency gas concentration transducer. Sensitivity of the developed device for detecting Helicobacter Pylori strains is from 2.1 kHz/ppm to 3.4 kHz/ppm.
KEYWORDS: Biometrics, Visualization, Tablets, System identification, Data modeling, Analytical research, Databases, Medicine, Electronics, Systems modeling
This work describes the use of linguistic modeling for biometric identify the patient during testing on graphics tablet. The general structure of the system identification algorithm and the realization method based on interval approach are reviewed. In the article, basic principles are considered aimed at construction, application and use of the automated systems of authentication on the basis of "informational handwriting" of work stylus on graphics tablet. Some approaches to tremor identification through two constituents of "informational handwriting" are explored: testing on keyboard, touchscreen and dynamics of work with the stylus on graphics tablet was considered.
Terms of operation of complex technical systems depend, first of all, on their technical condition, the level of which is determined by the capital class, service life and operating conditions. In turn, operating conditions are characterized by the presence of various types of loads, mechanical stresses caused by operational operations, as well as due to weather and climatic influences. Constant excess of permissible stresses can lead to the destruction of structures. Therefore, the continuous control of mechanical stress in the building is a factor in preventing not only economic losses, but also human casualties. The classification of methods of non-destructive control of mechanical stresses for metallic shutters of hydraulic engineering structures has been developed, a critical analysis of each method has been carried out, positive aspects and drawbacks of each method have been presented, as well as a relative change in residual-magnetized metal sample after application and removal of compressive stresses has been analyzed. The proposed work focuses on the search for new informative parameters based on the study of patterns of change in magnetic properties, on the development of new methods and means of measurement, in particular, with the involvement of several parameters in order to improve the accuracy and reliability of the measurement, significantly expand their capabilities.
Development of mathematical models for the analysis and synthesis of optimal management of an enterprise, with the account of the requirements of efficiency and survivability criteria, was performed. A single resource approach was used to develop models for an enterprise operation in nominal and non-nominal conditions – in the event of subsystems failures. The survivability functions are developed – the dependences of the enterprise efficiency losses on the cost of the failure configuration. The tasks of the enterprise optimization are identified: – minimization of survivability functions on the set of failure configurations due to the search for rational structures of the subsystems, and – maximization of the efficiency function in nominal and non-nominal operation modes. The method of optimal aggregation was used. The results of research on models are presented.
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