Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia

Advanced Search


2012 year, number 6

Matching Angular and Vector Descriptions of Three-Dimensional Group Point Objects

Y. A. Furman, I. L. Egoshina, R. V. Eruslanov
Volga State University of Technology
Keywords: associated polyhedron, group point object, iterative procedure, similarity measure, scalar product, matched filtering, matching vector descriptions, wire model
Pages: 3-17

Abstract >>
A solution was found to the problem of recognizing a spatial three-dimensional group point object with coordinate noise, a priori uncertainty of angular parameters, and a shift of the initial vector component that defines the object. An iterative approach to matching angular parameters and vector descriptions of the recognized and reference groups of point objects is proposed.

Statistical, Neural, and Combined Filtering Algorithms for Applicative Image Noise

P. V. Kalinin, A. A. Sirota
Voronezh State University
Keywords: image processing, applicative noise, neural networks
Pages: 18-28

Abstract >>
Correlations for the lower limit of the estimate error variance of images distorted by additive and applicative noise are obtained. The potential and actual estimate error variances for linear and nonlinear filtering algorithms are analyzed. A combined filtering algorithm for images distorted by applicative noise is developed.

Method of Abandoned Object Detection Based on a Sequence of Depth Images

V. A. Kulikov, E. V. Ivanova
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences
Keywords: abandoned object detector, depth images, background estimation
Pages: 29-34

Abstract >>
A new method of abandoned object detection based on analyzing a sequence of depth images is proposed, and algorithms of real-time determination of the quasi-stationary background and abandoned objects are developed. The efficiency of the proposed algorithms is compared with that of the algorithm based on analyzing brightness images.

Comparison of Limited-Angle Tomography Algorithms Based on the Cavalieri Condition

N. V. Vazhenceva, A. V. Likhachov
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences,
Keywords: two-dimensional limited-angle tomography, Cavalieri condition
Pages: 35-45

Abstract >>
A method of solving two-dimensional limited-angle tomography problems, based on the Cavalieri condition for the Radon transform, is investigated. Two algorithms realizing this approach are compared between themselves and also with the algorithm calculating missing projections from approximate tomograms. Numerical simulations show that all three algorithms allow the reconstruction accuracy to be improved in the case under consideration. Each of them, however, has certain specific features, which should be taken into account in solving practical tasks.

Local Properties of Precise Algorithms of Three-Dimensional Reconstruction from Cone Projections

V. P. Karikh
Federal Research and Production Center Altai
Keywords: 3D-reconstruction, cone beam, Radon transform, integral-differential transform
Pages: 46-52

Abstract >>
The emergence and development of algorithms for three-dimensional reconstruction in X-ray tomography are considered in historical sequence. The data completeness condition for precise reconstruction of an object at one point is studied. It is shown that some precise algorithms are used to reconstruct part of the object from data satisfying the completeness condition for this part. Other algorithms for solving the same problem require a full set of data for the entire object.

Using Nonparametric Goodness-of-Fit Tests to Validate Accelerated Failure Time Models

N. S. Galanova, B. Y. Lemeshko, E. V. Chimitova
Novosibirsk State Technical University
Keywords: accelerated failure time tests, AFT models, censored measurements, Kaplan-Meier estimates, nonparametric goodness-of-fit tests, modified tests
Pages: 53-68

Abstract >>
The construction of a reliability function from the results of accelerated failure time (AFT) models is considered. The constructed AFT models are verified by analyzing a sample of residuals. The fit of the residual sample to the baseline probability distribution is tested using modified nonparametric goodness-of-fit tests. In the absence of censoring in tests, it is proposed to use previously constructed models of distribution of statistics for testing composite hypotheses. In the case of censoring of type I or II, distributions of the goodness-of-fit test statistics are found by statistical modeling.

Reducing the Stabilizing Control Order for a Double Inverted Pendulum

A. A. Voevoda, A. N. Koryukin, A. V. Chekhonadskikh
Novosibirsk State Technical University
Keywords: automatic control system, reduced-order controller, double inverted pendulum, Hurwitz stability, multiple poles
Pages: 69-83

Abstract >>
The problem of stabilization of an unstable plant by a reduced-order single-channel controller is considered. The possibility of compensating small deviations of a double inverted pendulum on a cart by acting on the cart is studied. An algebraic method for finding the extreme locations of the poles through the construction of root simplexes is proposed. Using this, the Hurwitz stability boundaries for various reduced-order controllers are calculated. It is shown that robust stabilization of the pendulum system in the class of reduced-order controllers is impossible.

Increasing of Accuracy of Angular Measurements by Using Hybrid Photoelectric Converters

V. P. Kiryanova1, A. V. Kiryanovb2
1 Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences
2 Novosibirsk State Technical University; Technological Design Institute of Scientific Instrument Engineering,
Keywords: digital angle converters, hybrid photoelectric converter, path averaging method, raster scanning technology
Pages: 84-91

Abstract >>
The basis sources and methods of reducing the errors of incremental photoelectric digital converters for angular measurements are analyzed. A method of constructing hybrid photoelectric converters that increase the accuracy of angular measurements is proposed. The result is achieved by simultaneous measurements of the turning angle and current radial deflections of the converter shaft axis.

Effect of Diffraction on the Results of Quantitative Cytophotometry

I. G. Pal'chikovaa1, L. V. Omel'yanchukc2, E. S. Smirnovb3
1 Technological Design Institute of Scientific Instrument Engineering; Novosibirsk State University
2 Institute of Molecular and Cell Biology, Siberian Branch, Russian Academy of Sciences
3 Novosibirsk State University
Keywords: Fresnel diffraction, point spread function of the microscope, DNA, cytophotometry
Pages: 92-101

Abstract >>
The influence of diffraction on the results of computer cytophotometry has been explored through experiments and theoretical analysis. The relative error introduced by diffraction is shown to depend significantly on the optical characteristics of the object: size and absorption. In computer cytophotometry, the choice of standards having a lower DNA concentration in nuclei with large sizes is found to be favorable for measurements of the length of the genomes of various organisms. It is proved theoretically and experimentally that the systematic error due to diffraction can be accounted for without the digital processing of each micro-image involving deconvolution procedures with the point spread function of the microscope.

Stability of the Vision Field and Spheroidal Retinoids

A. M. Kovalev
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences; Technological Design Institute of Scientific Instrument Engineering
Keywords: retinoid, retinotopy, stereopsis, visual space
Pages: 102-110

Abstract >>
A short-term memory structure (three-dimensional spheroidal retinoid) is proposed for stabilization of the wide-angle vision field and realization of the stereopsis process, as well as formation and storage of the binocular visual space in observer's consciousness.

Dependence of the Sizes of Damaged Regions around Indium Contacts to p-Type CdHgTe on GaAs Substrates on the Annealing Temperature and Time

A. R. Novoselov, I. G. Kosulina
Rzhanov Institute of Semiconductor Physics, Siberian Branch Russian Academy of Sciences
Keywords: CdHgTe, p-n junctions, current-voltage characteristics of p-n junctions
Pages: 111-115

Abstract >>
It is found that damaged regions are formed around indium contacts to p-type CdHgTe {310} heteroepitaxail layers (HELs) on GaAs substrates and the sizes of these regions depend on the temperature and time of annealing in air. It is shown experimentally that at an annealing temperature of 90 ºC, the rate of expansion of the damaged regions is about 4 µm/h, and at temperatures of 120 ºC, it is more than 25 µm/h. After 488 hours of annealing of plates of CdHgTe HELs at 60 ºC in air, the formation of damaged regions around the indium contacts to the p regions was not observed. The studies were performed on plates of p-type CdHgTe HELs on GaAs substrates whose surface was covered with SiO2 and Si3N4 dielectrics (with a total thickness of about 0.15 µm), with windows where p-n junctions were generated by ion implantation of boron.

Application of a Neural Network for Diagnostics of Digital Systems

T. T. Omorova1, N. S. Asylbekovb2
1 National Academy of Sciences of the Kyrgyz Republic
2 Kyrgyz State Technical University named after I. Razzakov
Keywords: neural network, diagnostics, digital system, functional diagram of the element
Pages: 116-120

Abstract >>
Approaches to determining the unknown operator and the diagram of the neural network in the process of its analysis for diagnostics of digital systems are considered.