St. Petersburg State University of Telecommunications

About: St. Petersburg State University of Telecommunications is a education organization based out in Saint Petersburg, Russia. It is known for research contribution in the topics: Computer science & The Internet. The organization has 408 authors who have published 465 publications receiving 2160 citations.

On the Peculiarities of the Constructive Solution For Dandelin Spheres Problem

Abstract: This paper is devoted to analysis of Dandelin spheres problem based on the constructive geometric approach. In the paper it has been demonstrated that the traditional approach used to this problem solving leads to obtaining for only a limited set of heterogeneous solutions. Consideration of the problem in the context of plane and space’s projective properties by structural geometry’s methods allows interpret this problem’s results in a new way. In the paper it has been demonstrated that the solved problem has a purely projective nature and can be solved by a unified method, which is impossible to achieve if conduct reasoning and construct proofs only on affine geometry’s positions. The research’s scientific novelty is the discovery and theoretical justification of a new classification feature allowing classify as Dandelin spheres the set of spheres pairs with imaginary tangents to the quadric, as well as pairs of imaginary spheres with a unified principle for constructive interrelation of images, along with real solutions. The work’s practical significance lies in the extension of application areas for geometric modeling’s constructive methods to the solution of problems, in the impro vement of geometric theory, in the development of system for geometric modeling Simplex’s functional capabilities for tasks of objects and processes design automation. The algorithms presented in the paper demonstrate the deep projective nature and interrelation of such problems as Apollonius circles and spheres one, Dandelin spheres one and others, as well as lay the groundwork for researches in the direction of these problems’ multidimensional interpretations. The problem solution can be useful for second-order curves’ blending function realization by means of circles with a view to improve the tools of CAD-systems’ design automation without use of mathematical numerical methods for these purposes.

Density-density correlations on a gelatin films surface

Abstract: The spatial correlations on the surface of films obtained from aqueous solutions of gelatin during cooling from 320 to 293 K have been studied using electron microscopy. It has been shown that the total density fluctuation correlation function on the scale R > 4 nm can be represented in the form h(R) ∼ R−nexp(−R/ζ), where the correlation radius ζ coincides with the hydrodynamic radius of a macromolecule. Unfolding of macromolecules in the coil → helix transformation leads to a decrease in the density and the fractal dimension of the physical network of pinnings of macromolecules and to variation in the index n of the power term in the function h(R) from n = 1 to 2, due to the transition from a continual type of disorder to a cellular type in a solid.

Implementation White-Box Cryptography for Elliptic Curve Cryptography

Abstract: The development of technologies makes it possible to increase the power of information processing systems, but the modernization of processors brings not only an increase in performance but also an increase in the number of errors and vulnerabilities that can allow an attacker to attack the system and gain access to confidential information. White-Box cryptography allows (due to its structure) not only monitoring possible changes but also protects the processed data even with full access of the attacker to the environment. Elliptic Curve Cryptography (ECC) due to its properties, is becoming stronger and stronger in our lives, as it allows you to get strong encryption at a lower cost of processing your own algorithm. This allows you to reduce the load on the system and increase its performance.

Development of the Theoretical-Practical Model of Protection of the Means of Transport of Radioactive Materials

Abstract: Ensuring the safety of transportation of radioactive materials is of great importance due to the presence of the potential risk of damage to people, the environment and property during transportation, loading and unloading operations and intermediate storage. This article describes the means of storing liquid radioactive waste, as well as the process of their transportation. During the study, emergency situations during the transportation of LRW were considered. A security model has been developed for the storage of radioactive materials during multimodal transport.

The emission characteristics of graphene in different modes of high-voltage power supply

Abstract: We found out the general laws of the current-voltage characteristics hysteresis behavior for emitters of different nanomaterials - graphene, nanotube. Comparison of two power supply modes showed that the IVCs change with growth and decrease of the scanning voltage amplitude in "fast" mode which correlates with current-voltage characteristic hysteresis in "slow" mode. Common patterns forms of current-voltage characteristics in different power supply modes were identified.