bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improving the efficiency of heat supply systems for infrastructure facilities by optimizing the pipeline subsystem according to technical and economic indicators
Authors: Popov N N , Khvostov A A , Kalach A V , Ivanova N A 
Published: May 2021

Abstract
The fuel economy, which provides acceptance, storage, preparation and supply of the necessary amount of fuel oil for its combustion in boiler furnaces, is one of the energy-intensive technological subsystems of thermal power plants and boiler houses. The design of new technological pipelines and the modernization of existing pipeline systems for transporting fuel oil involves hydraulic calculations. Generally accepted in practice is the hydraulic calculation of pipeline lines based on the flow continuity equation and the Bernoulli equation for a real viscous liquid, which takes into account the pressure loss due to friction and to overcome local pipeline resistances. With this approach, hydraulic calculation is a multi-variant task, since there are an infinite number of combinations of parameters pipeline diameter - pressure drop, which are not equal from both economic and technical points of view. Research of literature sources has shown the feasibility of conducting hydraulic calculation of pipe-wire lines on technical and economic indicators. As a criterion for optimization of technological pipelines, the total annual costs for the creation and operation of the pipeline, which are a linear superposition of capital and operational costs, are proposed. The paper offers calculation relations for determining the optimal diameter of the pipeline from the condition of minimum total annual costs for its creation and operation, taking into account current prices and tariffs for the pipeline and electricity, pipeline tracing, conditions of its operation, as well as the properties of the transported medium. On the example of a hydraulic installation for pumping fuel oil, computational experiments were performed to assess the influence of the pipeline diameter on its technical and economic indicators and determine the optimal parameters of the fuel oil pipeline.
Solving the problem of service requests based on the algorithm for minimizing the maximum time offset
Authors: Rossikhina L V , Egorov E Yu 
Published: May 2021

Abstract
The article proposes an approximate algorithm for forming the optimal sequences of service requests for repair of ISS elements with a minimum absolute error of the target function. The algorithm includes two steps. In the first step, new policy deadlines are set for the completion of application servicing. In the second step, a well-known algorithm for solving the problem with new Directive deadlines is used to determine the optimal sequence from which the desired solution to the original problem will differ by no more than an absolute error.
On equivalence of PFP-operator and PFP-quantifier
Authors: Sekorin V 
Published: May 2021

Abstract
In this paper we consider two different logic languages. Both of them are extensions of first order logic. The first semantics is obtained by adding a partial fixed point operator. The second semantics is based on considering a partial fixed point as a non-standard quantifier. For this two semantics we demonstrate that they have an equal expressive power. For this purpose we show how to express an arbitrary formula of one logic with a formula of another.
Researching of firewall capabilities during organizing multi-user work
Authors: Stepanov L V , Kuzmenko R V , Mokshin R S , Desyatov D B , Zybin D G 
Published: May 2021

Abstract
Fundamental concept in human life is a concept of a «system». This concept is extended to all of the directions of the human’s activity. A great number of the economic, engineering, biological and many others kinds of the objects are rather complicatedly organized systems. Any system has a great number of parameters which characterize its organization and operation. Among these parameters a special point is associated with system safety. It can be determined as a state of system immunity to the different destructive impacts which can have a negative effect on its operation and/or its structure. In any variant of consideration this system is formed by participants of some relationships and it can have as organizational, as technical or some other nature at one and the same time. Examples of the organizational systems are enterprises, offices and organizations. Examples of the technical structures are infocommunication, telecommunication systems and networks. The performed analysis means a system character not only of the system safety, but also indicates at the aspects that determine safety. Moreover, it is possible to reveal a conflict character of interaction between some aspects of the system safety. This occasion provides a reasonable application for the simulation of the systems in the game theory. Examples of this application are also presented in this article.
Bifurcation of distribution function of electric breakdown voltages of polymer enamel-lacquer coatings
Authors: Virchenko Yu P , Novoseltsev A D 
Published: May 2021

Abstract
On the basis of general physics representations, the statistical model of multilayer enamel-lacquer polymer coatings is proposed. Such coatings contain randomly distributed air inclusions. The solution of statistical problem connected with the distribution of electric breakdown voltages of such coatings permits to explain the observed the violation unimodality of histograms of their dielectric strength.
Analysis and optimization of decision-making in integrated security systems
Authors: Zybin D G , Belokurov S V , Kondratov O A , Sidelnikov A N , Ponomarev E D 
Published: May 2021

Abstract
The paper offers a comprehensive set of characteristics of integrated security systems for electronic document management, which allows conducting research on the degree of protection of such systems from external and internal threats from the point of view of system analysis and modeling their functioning in various conditions. Classification descriptions are given and data analysis is performed when modeling decision-making processes in integrated security systems on the example of responding to threats of information leakage through parametric channels. The optimal set of response measures is given for performing illegal actions by an attacker to intercept information via parametric channels when using the corresponding modes of operation of the TCP Protocol. The type of analytical models of performance characteristics of measures to respond to threats of information leakage through parametric channels is determined by the functional model of such measures. The resulting system-level characteristics of effective response to the threat of information leakage on parametric channels is based on the stochastic representation of the conditions for timely interventions.
System analysis of resource interaction processes in the biotechnological system
Authors: Zybin D G , Belokurov S V , Belokurova E V , Sotnikov N V , Bokadarov S A 
Published: May 2021

Abstract
The paper provides mathematical modeling of processes occurring in the biotechnological system, using the example of the interaction of functional microorganisms with contaminating microflora, which is currently a promising scientific direction. The analysis showed that there are no existing studies on this issue, as well as systematic and integrated approaches to solving this problem that allow describing the processes under consideration. Therefore, it is necessary to analyze and build a system model that reflects the full range of interactions between useful and extraneous populations of microorganisms in the production of bakery products. System analysis and mathematical modeling of microbiological processes is a complex task. It is necessary to take into account a lot of factors, such as the simultaneous flow of several non-stationary processes; a lot of state parameters, including the analysis of relationships between them; changes in real-time technological parameters, in particular the main resource, taking into account various properties of microbial populations that affect the behavior of microbiological systems (mortality, birth rate, the existence of extraneous microflora, etc.), and other factors that directly affect the quality of the finished product. These factors characterize the complexity of forming a mathematical model that allows you to take into account all the main features of the production of bakery products. The existing mathematical apparatus and the system analysis of this kind of production carried out before considered the behavior of the population of beneficial microorganisms, but did not contain an analysis of the effect of contaminating microflora on it. The problem can be reduced to a system of differential equations describing the microbiological process as a whole. To describe the General model needed to describe an unknown function, including constraints on the parameters. In addition, you must set the initial and boundary conditions and determine the coefficients of the model. The paper offers a system model for analyzing the effect of plant additives on biotechnological properties and test quality indicators. The presented system model allows you to continue the study of the issues raised in the work, by further studying its components.
Application of Bayesian networks and Petri nets apparatus for the study of projects implementation calendar plans
Authors: Azarnova T V , Beloshitskiy A A , Kashirina I L 
Published: May 2021

Abstract
Time schedules reflect the main aspects of the projects implementation related to the work completion time, its financing, resource provision and risk distribution. This article proposes mechanisms for studying the time schedules of projects implemented in conditions of risk and uncertainty. The mechanisms developed in the framework of the study are based on the use of colored Petri and Bayes nets apparatus. The use of these tools allows to simulate the execution of project work under certain evidence, restrictions or rules for the allocation of resources between them. Colored Petri nets with predicative transitions allow simulating the overall dynamics of the project. Bayesian networks are used to assess the risks of individual project activities based on available evidence. Based on the results of the simulation modelling, the time parameters of the events and activities of the project are calculated, and the possibility of the project being completed within the scheduled time is assessed. The work examines different options for the distribution of project resources, taking into account and not taking into account competition between works and a possible shortage of resources.
Algorithms and methods for extracting knowledge about objects defined by arrays of empirical data using ANN models
Authors: Arzamastsev A A , Zenkova N A , Kazakov N A 
Published: May 2021

Abstract
Most Data Mining techniques are based on traditional methods of constructing mathematical models and their parametric identification. The article considers the technology of extracting knowledge about objects, given by empirical data arrays. It is based on detecting some characteristic features in the object generating these data. They can include dynamic and static characteristics; delays in various channels; inertia of channels or inertia combined with delay; different channel sensitivity; bypass and certain classes of nonlinearities. We also considered the objects that are characterized by a constant flow of new data, which makes it necessary to retrain the model. As a tool for obtaining knowledge in this work, the apparatus of artificial neural networks (ANNs) is used. It includes a structure builder, which allows you to quickly change the structure of ANN models and machine training algorithms. This enables you to successfully solve parametric identification problems. Algorithms and methods of knowledge extraction have been developed for these tasks. Examples that confirm the possibility of their use are given.
Development and automation of the algorithm for determining the enthalpy of formation for organic compounds
Authors: Akhmetyanova A I 
Published: May 2021

Abstract
The best solution for the development of chemical and technical processes is possible if there is reliable information on the physicochemical and thermodynamic properties of chemical compounds only. An urgent task is the development of universal theoretical methods for calculating and predicting the properties of chemical compounds, which make it possible to independently assess the energy content of a substance, identify incorrect data and, ultimately, reliably determine the thermal effects of chemical reactions, which is important for the development of technological regulations and conscious control of chemical processes. The work is devoted to the description of the mathematical apparatus for constructing the basis of homodesmic reactions on the example of cyclic compounds.
Computer analysis of differential systems stability based on linearization and matrix multiplicative criteria
Authors: Bulanov S G 
Published: May 2021

Abstract
This article proposes a method of stability analysis in the sense of Lyapunov for systems of ordinary differential equations. The method is based on stability criteria in the form of necessary and sufficient conditions. The criteria are obtained from matrix multiplicative transformations of difference numerical integration schemes. The form of the criteria entails the possibility of their cyclical software implementation as a cycle based on the number of cofactors. It is mathematically substantiated that the replacement of an infinite matrix product by a finite product, which is necessary in the programming process, preserves the reliability of the stability analysis according to the proposed criteria. We studied the influence of inaccuracy of the difference solution of the system on the reliability of the computer analysis of stability.
Method and model for quantitative assessment of the performance indicator of information security systems against unauthorized access in automated systems based on a computational experiment
Authors: Bulgakov O M , Kadnova A M , Meshcheryakov V A , Kuznetsov D N 
Published: May 2021

Abstract
The article is devoted to the solution of the practical problem of a quantitative assessment of the quality characteristic «usability» of information security systems against unauthorized access in automated systems in the secure version. The main operator who interacts with the information security system against unauthorized access during its operation is a security administrator. This interaction is carried out through the interface of the security program. Therefore, for this category of users, the most relevant assessment is the characteristic «usability» of the quality of functioning of the information security system against unauthorized access. The method of evaluating this characteristic involves assessment of the operation code, probabilistic and time indicators, based on the experiment. The obtained values of these indicators can be further used in the comparative analysis of the «usability» characteristic of information security systems against unauthorized access of various classes, during the development of work plans for information security services, and the justification of requirements for the organization and structure of information security services.
Identification of semantic objects in information stream
Authors: Vishnyakov Y M , Vishnyakov R Y 
Published: May 2021

Abstract
This work formulates and describes a formal approach to the identification of semantic objects in text streams. The reasoning is based on the theoretical provisions of the computational theory of semantic interpretation in terms of the computational representation of the semantics of text fragments and their comparison for semantic proximity. The proposed approach makes it possible to reveal the semantic traces of objects in text streams and to carry out their identification using them. A characteristic feature of the proposed approach is its use for identification of the grammatical structure of texts. We provide illustration for the given examples.
Intelligent analysis of the list of technological operations for the problem of developing of functional simulators stowage and installation-mooring of the landing gear
Authors: Demidova L A , Mordakin B Yu 
Published: May 2021

Abstract
The aim of the article is to investigate the number and assortment of training solutions required to perform technical operations involved in parachute packing and landing platform mounting and mooring. The article proposes a novel approach to the identification of the number and value of the attributes of technical operations, which takes into consideration objective information and expert assessment results. The article presents an algorithm aimed at the identification of the number and assortment of training solutions based on the algorithm of DBSCAN cluster analysis and promoting the calibration of expert assessments in order to improve clustering quality. The results of experimental research prove the feasibility of dividing technical operations into clusters whose quantity and composition are predicted by experts and are practically relevant.
Algorithmic properties of some fragments of concatenation theory
Authors: Karlov B 
Published: May 2021

Abstract
The paper considers two fragments of the word theory with concatenation. The first fragment has two relations denoting that one of the words is a prefix (respectively, a suffix) of another one. It is proved that this theory is algorithmically equivalent to elementary arithmetic and, therefore, undecidable. The second fragment has a countable set of power operations. It is proved that this theory admits effective quantifier elimination and is, therefore, decidable.
Prototype mobile application definitions fresh products based on neural network
Authors: Korobova L A , Matytsina I A , Tolstova I S , Mironova M S 
Published: May 2021

Abstract
The article discusses the functioning of the image classifier. The results of the process of research and implementation of the food freshness classifier using mobile phones to obtain product images are presented. Comparison of other approaches to reducing the risk of food poisoning is given. Provides research information on the collection of images for the classification of food and the classification of their freshness. A workable android application for recognizing the freshness of food has been implemented. Based on the analysis of the results of the training sample, the objects under study are ranked in order to determine the freshness of the product.
Improvement of methods for thermal energy metering in apartment buildings with a vertical heating system
Authors: Kuznetsov A V , Sheps R A 
Published: May 2021

Abstract
The article briefly discusses the problems of heat energy metering in an apartment building. We mention the main types of metering devices, including heat cost allocators of different kinds. We describe the problems of thermal energy metering in a heating system with vertical heating contour. Also, we indicate the possibility of using the methods of mathematical physics for heat energy metering.
Development of software systems for the design of technically complex products
Authors: Martyanov E I , Malygin E N 
Published: May 2021

Abstract
In the article, we propose the algorithm of development of program system which can be applied to designing technically complex products for the mathematical description of which the systems of differential equations with partial derivatives are used. This system allows us to obtain more accurate results than engineering methods and is relatively easy to use. As an example of implementing the proposed algorithm, we have created a subject-oriented software system designed to solve the problem of determining a two-blade stirrer’s design parameters and operating characteristics.
Piecewise interpolation solution of ordinary differential equations with application to numerical modeling problems
Authors: Romm Ya E , Dzhanunts G A 
Published: May 2021

Abstract
Piecewise interpolation approximation of functions of one real variable, derivatives and integrals is constructed with the help of Lagrange and Newton interpolation polynomials. The polynomials are transformed to the form of algebraic polynomials with numerical coefficients by means of restoring the polynomial coefficients by its roots. Formulas different from Vieta’s formulas are applied. In the resulting form, the polynomials interpolate the right-hand sides of ordinary differential equations, the expression of the antiderivative ones is used to approximate the solution. Iterative refinement is performed. Error estimates and results of numerical experiments for stiff and non-stiff problems in physical, chemical models and other processes are presented.
Mathematical modeling of zooplankton productivity in the Azov Sea in summer on a high-performance computer system
Authors: Sukhinov A I , Belova Y V , Lyapunova I A , Nikitina A V 
Published: May 2021

Abstract
The work is devoted to modeling of eurythermal and stenothermal zooplankton populations productivity in the Azov Sea in summer. The discretization of the problem was carried out using difference schemes of a higher order of accuracy, taking into account the filling of the calculated cells. The grid equations obtained as a result of the proposed mathematical model of biological kinetics discretization were solved by a modified adaptive variable-triangular method, which has a higher convergence rate in comparison with the existing methods of the variational type. A parallel algorithm for solving the problem on a high-performance computing system was developed, which made it possible to significantly reduce the time of the numerical solution of the problem. With the help of mathematical modeling, the analysis of various ways of development of the Azov Sea ecosystem was carried out, the influence of the gelatinous invasive on the production and de-struction processes of phyto- and zooplankton was researched. The developed software module, oriented to a multiprocessor computing system, can be effectively used for predictive modeling of interrelated hydrodynamic and biogeochemical processes in a shallow water body in summer.
Means, quasi-scalar product and covariance of fuzzy numbers
Authors: Khatskevich V L 
Published: May 2021

Abstract
In this paper, we discuss extreme properties of means of fuzzy numbers. The proposed new definition quasi-scalar product and covariance between fuzzy numbers, and their properties are considered. As an application of the introduced concepts, the problem of optimal linear approximation of a fuzzy number by a given system of fuzzy numbers is considered.