Vologda State University

Vologda, Russia

Vologda State University

Vologda, Russia
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Shishigin D.S.,Vologda State University
SPIIRAS Proceedings | Year: 2016

Computer programs for scientific research with complex geometric models should be integrated with a CAD-system. In the paper, we consider three approaches based on data exchange in the DXF (drawing exchange format); COM-technologies; and application programming interface (API) ObjectARX. DXF data exchange with CAD is a simple and universal way available to most researchers, but it excludes interactive CAD control. COM technologies provide simple, reliable mechanisms of interactive CAD control from an external program, although they do not have the highest level of performance. Combination with DXF increases their performance. For problems with complex geometric models, Auto-CAD-system provides ObjectARX API and .NET API - low-level technologies that ensure the maximum possible functionality and performance, compared to other technologies, but have some limitations. We present program listings that simplify the understanding of considered technologies. Their performance analysis has been conducted, and recommendations for their use are given from the researcher's perspective.

Shvetcov A.,Vologda State University
Procedia Computer Science | Year: 2017

The set of agent-oriented information systems that interact in a changing structure and operation conditions, is considered as a distributed intellectual environment. Such a representation is corresponding in geographically distributed systems (region, city), corporate information systems of enterprises and organizations, social groups within the various territorial structures, distributed heterogeneous systems and networks territorial entities, enterprises and organizations. On the basis of known models of neuro-fuzzy agents are proposed a model of the fundamental intelligent agent (FIA), operating in a dynamic heterogeneous information environment and carrying out reception of input messages in a usual source language and fuzzy input language, the creation of messages in the inner language to perform reasoning and reflection which can be either conventional or fuzzy, and transmitting to the external environment accurate and fuzzy messages in appropriate languages. A classification of possible FIA models are constructed in distributed intelligent systems and environments. A behaviour model of the FIA, defined Post calculus axiom schemes, combining precise and fuzzy representation of variables and manipulate the internal states, base attributes and logical formulas in fuzzy logic and first-order predicate calculus are constructed.

Kalinicheva O.V.,Vologda State University
Solar System Research | Year: 2017

Angular orbital parameters of Kreutz sungrazing comets are considered. Three groups of Kreutz dwarf comets are distinguished based on the positioning of orbit poles, and the motion of fragments from group A is modeled numerically. It is found that Kreutz dwarf comets have a very large parameter А3 of nongravitational acceleration. This may be associated with sublimation of substances more refractory than water ice at extremely short heliocentric distances. It is demonstrated that the nongravitational acceleration of Kreutz dwarf comets is asymmetric with respect to perihelion, and the perturbing function maximum is observed ~15 min after the perihelion passage. © 2017, Pleiades Publishing, Inc.

Aleksandrov I.K.,Vologda State University
Russian Engineering Research | Year: 2017

A new method is proposed for ongoing measurement of the dissipative properties of an elastic element in a mechanical system. The theoretical basis of the method is outlined. © 2017, Allerton Press, Inc.

Volkova S.,Vologda State University
Communications in Computer and Information Science | Year: 2015

In this paper a modified algorithm of localization of a face features based on the Viola-Jones method which is characterized by several classification stages is considered. Experiments show the improvement of the method performance that provides 98 % of correct localizations. © Springer International Publishing Switzerland 2015.

GOST R 54257-2010 recommends calculating the reliability of the earth foundations of structures by probabilistic methods with full statistical information about random quantities. Currently, there are no guidelines for calculating the reliabilityof earth foundations by the settlement with limited information about the parameters. The earth foundation (foundation bed) is a part of a mechanical system also including the foundation itself and the above-foundation construction. One of the indicators of the safety of this system is the probability of non-failure, where the probability of non-failure of an earth foundation is included. In this article, we discussed a new method for calculating the reliability of earth foundations of buildings and structures during the operation stage according to the deformation criterion with limited information on the soil and loads by using Zadeh's extension principle from fuzzy sets theory. The article presents formulas and an example of an algorithm for calculating earth foundation reliability by the settlement criterion.

An experimental theoretical method was considered for estimating the residual load-bearing capacity of an individual reinforced concrete beam at the operational stage according to the criteria of the working strength and durability of concrete reinforcement compressed zone of the beam. Integrated methods of beam testing and probabilistic methods of random variables definition were used. Ultimate load in the form of interval during the operational phase was accepted as the measure of carrying capacity, discussion is presented on the choice of its value obtained from the interval boundary that has been obtained. Transition from the experimentally obtained value of the ultimate load to the maximum operational load was studied. Examples of design models of beams with operational load and guidelines on how to determine their limit values were given.

Tomanov V.P.,Vologda State University
Solar System Research | Year: 2016

An overview is given of close encounters of nearly parabolic comets (NPCs; with periods of P > 200 years and perihelion distances of q > 0.1 AU; the number of the comets is N = 1041) with planets. The minimum distances Δmin between the cometary and planetary orbits are calculated to select comets whose Δmin are less than the radius of the planet’s sphere of influence. Close encounters of these comets with planets are identified by numerical integration of the comets’ equations of motion over an interval of ±50 years from the time of passing the perihelion. Close encounters of NPCs with Jupiter in 1663–2011 are reported for seven comets. An encounter with Saturn is reported for comet 2004 F2 (in 2001). © 2016, Pleiades Publishing, Inc.

Shishigin S.L.,Vologda State University | Meshcheryakov V.E.,Vologda State University
Technical Physics Letters | Year: 2015

A new method of lightning protection has been developed in which the lightning leader is attracted to ground objects as a result of the electrostatic interaction between the leader charge and induced charges on ground objects. © 2015, Pleiades Publishing, Ltd.

Kurtasov A.,Vologda State University
CEUR Workshop Proceedings | Year: 2014

This paper overviews the problem of automated generation of assessment test items from natural-language text. In a previously published article, an experimental system aimed at generating fill-in-the-blank test items from Russian text was decribed. In this paper, some aspects of the system's quality are analyzed. Main directions for future work are defined, including evaluation of the system and development of methods for filtering text fragments and selecting words to blank out.

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