bluuebunny/crossref_metadata_2025_split huggingface dataset:
The synthesis method of regulators for multichannel systems using neural networks
Authors: Воевода Александр Александрович , Романников Дмитрий Олегович 
Published: August 2021

Синтез регуляторов для многоканальных систем - актуальная и сложная задача. Одним из возможных способов синтеза является применение нейронных сетей. Нейронный регулятор либо обучают на предварительно рассчитанных данных, либо используют для настройки параметров ПИД-регулятора из начального устойчивого положения замкнутой системы. Предложено использовать нейронные сети для регулирования двухканального объекта, при этом обучение будет выполняться из неустойчивого (произвольного) начального положения с применением методов обучения нейронных сетей с подкреплением. Предложена структура нейронной сети и замкнутой системы, в которой уставка задается при помощи входного параметра нейронной сети регулятора
The problem for synthesis of automatic control systems is hard, especially for multichannel objects. One of the approaches is the use of neural networks. For the approaches that are based on the use of reinforcement learning, there is an additional issue - supporting of range of values for the set points. The method of synthesis of automatic control systems using neural networks and the process of its learning with reinforcement learning that allows neural networks learning for supporting regulation is proposed in the predefined range of set points. The main steps of the method are 1) to form a neural net input as a state of the object and system set point; 2) to perform modelling of the system with a set of randomly generated set points from the desired range; 3) to perform a one-step of the learning using the Deterministic Policy Gradient method. The originality of the proposed method is that, in contrast to existing methods of using a neural network to synthesize a controller, the proposed method allows training a controller from an unstable initial state in a closed system and set of a range of set points. The method was applied to the problem of stabilizing the outputs of a two-channel object, for which stabilization both outputs and the first near the input set point is required
Logical aspects of experimental design and analysis
Authors: Хабаров Валерий Иванович 
Published: August 2021

Предложена схема формализации задач активной идентификации объекта с использованием аппарата теории моделей - современного раздела математической логики. Теория моделей позволяет погрузить предмет “планирование и анализ эксперимента” в контекст семантического анализа. Семантический анализ понимается как установление соответствия между миром и его формальным представлением. С этой точки зрения представления об исследуемом объекте выражаются в некоторой прикладной теории. Предложен вывод модели для данной теории как процесс интерпретации, в котором ключевая роль отводится “экспериментатору”. Полученные результаты могут быть использованы при проектировании архитектур интеллектуальных систем для экспериментальных исследований, для построения онтологии эксперимента, создания баз знаний
Purpose. The purpose of this work is to formalize the tasks of active object identification based on the apparatus of model theory - a modern section of mathematical logic. Model theory allows putting the subject “planning and analysis of an experiment” in the context of semantic analysis. Semantic analysis is understood as establishing a correspondence between the world and its formal representation. From this point of view, the concept of the object under study is expressed in some applied theory, which allows applying formal methods of model theory to it. Methods. It is assumed that the model is derived for this theory as an interpretation process, in which the key role is assigned to the experimenter. As a research method, it is proposed to use commutative diagrams that reflect the process of interpretation and extension of communication diagrams for the so-called equipped theories of planning and analysis of experiments. Results. The properties of the proposed models are proved and examples for planning a regression experiment are presented as an illustration. It is proved that for linear models it is possible to construct a finitely axiomatization capable theory. Findings, originality. The obtained results can be used in the design of architectures for an intelligent system in experimental research, building an experiment ontology and creation of knowledge bases. These studies will allow using logical programming to implement images of the presented commutative diagrams for equipped theories as applied systems for planning and interpreting the experiment
Planning an experiment in the study of air pollution in industrial premises
Authors: Швецова-Шиловская Татьяна Николаевна , Полехина Ольга Васильевна , Иванов Дмитрий Евгеньевич , Скворцов Федор Игоревич 
Published: August 2021

Отмечена роль ведущих отечественных ученых В.И. Денисова и В.Г. Горского в становлении и развитии теории планирования эксперимента и прикладных статистических методов анализа данных. На основе математической теории планирования эксперимента исследовано влияние параметров воздушной среды рабочих помещений на интенсивность испарения опасных химических веществ с поверхности пролива. Создана математическая модель, описывающая этот процесс. Данные исследования необходимы для оценки профессионального риска на химических производствах
The article addresses the important problem of assessing the professional risk of workers in industries where the chemical factor is possible, as well as the role of the mathematical theory of experimental design in conducting of experimental research. The role of leading Russian scientists Denisov Vladimir Ivanovich and Gorsky Vladimir Grigoryevich in the establishment and development of experimental design theory and applied statistical data analysis methods is noted in the work. It is noted that in order to successfully solve scientific, industrial, and technological problems, modern research engineer must have competencies in the field of the theory of mathematical statistics, practical skills in planning an experiment, and methods for statistical processing of experimental data. The aim of the studies presented in this paper is to assess the influence of the air environment of the working room (temperature, humidity) on the rate of evaporation of a hazardous chemical from the spill. The experiment was carried out on a facility that allowed varying over a wide range the temperature and humidity. The experiment was carried out in accordance with the plan developed on the basis of the mathematical theory of experimental design. The obtained mathematical model allows estimating the level of air pollution by hazardous chemicals in the temperature and humidity range typical of workrooms. A comparison of the concentrations calculated according to the model with the permissible level of air pollution (MPC of the working zone air) will allow assessing the risk of inhalation exposure to hazardous chemicals on working personnel in local emergency situations. Conducted research is necessary to assess occupational risk in chemical industries
Mathematical modelling of the filtration process in a porous medium based on non-conformal mixed finite element formulation
Authors: Шурина Элла Петровна , Иткина Наталья Борисовна , Трофимова Светлана Алексеевна 
Published: August 2021

Статья посвящена математическому моделированию процесса фильтрации жидкости в пористой геологической среде под действием давления. Разрабатывается вычислительная схема решения задачи Дарси на основе смешанной конечноэлементной постановки с использованием разрывного метода Галёркина. Выполнено построение специализированных базисных систем для скорости в пространстве H и давления в пространстве L . Проведены вычислительные эксперименты на классе модельных задач.
The paper addresses mathematical modelling modelling for the process of fluid filtration in porous geological media under pressure. A computational scheme based on a mixed non-conformal variational formulation for solving the Darcy problem with a tensor coefficient of permeability of the medium was developed, implemented and verified. Moreover, the discontinuous Galerkin method for obtaining the finite element approximation was used. A specialized hierarchical basis system for velocity in the H space and a basis system with discontinuous functions on boundaries of finite elements for pressure in the L space were constructed. Computational experiments on a class of problems close to real ones have shown that for a computational domain with multidirectional rectangular inclusions of arbitrary size and concentration, the numerical fields of pressure and velocity are determined with a relative error of 1e-2 even on a coarse grid. An increase in the contrast of the permeability coefficient of the medium with respect to the permeability coefficient of inclusions does not change the relative error in determining the numerical fields. To this end, we can conclude that the constructed computational scheme is stable to significant variation of the coefficient. The authors have developed and verified a software package that is able to export a ready-made solution to the problem in the “.dat” format file for further graphical display and analysis in the Tecplot software package.
Building highly efficient distributed automation systems for circuit design based on data compression
Authors: Анисимов Владимир Иванович , Гридин Владимир Николаевич 
Published: August 2021

Рассмотрены вопросы повышения эффективности работы распределенных систем автоматизации схемотехнического проектирования путем минимизации времени взаимодействия веб-сервисов с сетью Интернет на основе методов сжатия данных. Приведены результаты сравнительной оценки эффективности основных методов компактной обработки разреженных матриц при использовании для сжатия данных метода индексно-адресных матриц, списковых схем хранения, метода строчного фиксированного формата, метода строчно-столбцового формата. Известной особенностью методов фиксированного формата является невозможность включения в сжатое описание новых ненулевых элементов, появляющихся при решении уравнений моделируемой схемы. На основе сравнительного анализа методов сжатия данных показано, что наибольший интерес для практической реализации высокоэффективного программного обеспечения систем автоматизированного проектирования представляет метод списковых схем, имеющий наибольшие возможности для сканирования матриц в произвольном направлении. Существенное достоинство метода списковых схем - возможность включения в компактное описание дополнительных ненулевых элементов, которые образуются при решении уравнений.
This article considers the issues of increasing the efficiency of distributed automation systems for circuit design by minimizing the interaction time of web services with the Internet based on data compression methods. The results of a comparative assessment of the effectiveness for the main methods of compact processing of sparse matrices using the method of index-address matrices, list storage schemes, the method of row fixed format, and the method of row-column format are presented. A well-known feature of the fixed-format methods is the impossibility of including in the concise description of new nonzero elements that appear when solving the equations of the simulated circuit. Comparative analysis of data compression methods shows that the method of list circuits, which provides the greatest opportunities for scanning matrices in an arbitrary direction, is of great interest for implementation of highly efficient software for computer-aided design systems. An essential advantage of the list circuit method is the possibility of including additional nonzero elements in the compact description, which are formed when solving equations.
Intelligent system for supporting functional characteristics of radar monitoring based on failure prediction
Authors: Осипов Александр Владимирович , Тимошенко Александр Васильевич , Перлов Анатолий Юрьевич , Львов Кирилл Вячеславович 
Published: August 2021

Показаны особенности применения методов искусственного интеллекта в современных радиолокационных комплексах (РЛК) мониторинга для организации превентивного технического обслуживания. Приведена структурно-функциональная схема интеллектуальной системы поддержки функциональных характеристик РЛК. Представлены экспериментальные оценки точности прогнозирования излучаемой мощности РЛК по данным диагностического контроля.
Purpose. This work is devoted to a description of an intelligent support system (ICP) of the functional characteristics of radar systems operating in heat-stressed modes. The purpose of the work is to simulate the operation of the failure prediction module based on the data on the operation of the critical components of the radar. Methodology. Failure prediction based on block temperature data was performed using supervised machine learning methods, including regression methods. The highest quality parameters of the forecasting model (horizon - accuracy) were achieved when training the model using the gradient boosting method, which allows organizing continuous additional training of the forecasting model during the operation of the radar by forming a training sample consisting of a data flow about the technical state. Findings. A structural and functional diagram of the ICP has been developed and a description of the operation of its components is given. The error (20%) and the horizon (20 min.) of the prediction of failures obtained during the experiments are sufficient for the staff serving the radar to take the necessary measures and prevent a critical decrease in the functional characteristics of the product. Originality/value. The introduction of ISP will allow realizing the maximum functional capabilities of the radar, taking into account the forecast of their change, as well as making an operational report to the command post of the radar on the reasons for the decrease in functional readiness according to the pop-up tips about the faulty element and the degree of its influence on the functional characteristics.
Numerical simulation of heat transfer processes during single crystal growth by the Bridgman - Stockbarger method in fixed and rotating crucibles
Authors: Кислицын Степан Александрович , Митин Константин Александрович , Бердников Владимир Степанович 
Published: August 2021

Численно методом конечных элементов исследованы процессы кристаллизации кремния в плоскодонных неподвижных и равномерно вращающихся графитовых цилиндрических тиглях в режимах сопряженного конвективного теплообмена. Процессы кристаллизации кремния изучены при фиксированной скорости опускания тигля в холодную зону и различных скоростях его вращения. Опускание тигля имитировалось перемещением точки излома в распределении температуры на внешней стороне стенок тигля. Точка излома - это граница перехода от нагретого до начальной температуры участка стенки к области с заданным градиентом температуры. Использованы адаптивные сетки на треугольниках, отслеживающие положение фронта кристаллизации на каждом временном шаге. Использован пакет программ собственной разработки.
The dependence of both spatial shape and intensity of the convective flow of silicon melt during the growth of a silicon ingot by the Bridgman-Stockbarger method was studied numerically by the finite element method. Stationary and uniformly rotating graphite crucible in conjugate convective heat transfer regines were examined. The simulation was carried out on the basis of dimensionless system of equations for the thermogravitational convection in the Boussinesq approximation using the bipolar approach. In the mixed convection regine, the system of equations was augmented by an equation for the azimuthal velocity. Adaptive grids on triangles were used to track the position of the crystal-melt interface at each time step. The calculations were carried out at a constant rate of lowering the crucible from the hot to the cold zone, equal to 2.81 cm/h, and at a constant temperature gradient equal to 35 K/cm. Lowering the crucible was simulated by moving the inflection point in the temperature distribution on the outside of the crucible walls. The range of angular velocities of crucible rotation from 0 to 10 rpm is considered. It is shown that as the angular velocity of crucible rotation in the axial region increases, both the velocity of the downward flow arising in the regines of thermogravitational convection gradually and the convective heat flux to the crystal-melt interface decrease. As a result, in the range of angular velocities from 2 to 10 rpm, the shape of the crystal-melt interface gradually approaches to the one typical for the thermal conductivity regime. It is shown that at the initial stage of the process at an angular velocity of 10 rpm in the axial region of the cooled crucible bottom, the nucleation of a single crystal is possible.
Scientometrics view on scientific contacts of academician N.N. Yanenko
Authors: Шокин Юрий Иванович , Барахнин Владимир Борисович 
Published: August 2021

В данной статье, посвященной столетию со дня рождения выдающегося советского математика и механика, академика АН СССР, Героя Социалистического Труда Николая Николаевича Яненко, представлен подробный анализ его научной генеалогии с использованием проекта “Математическая генеалогия”. Показано, что в научной генеалогии академика Н.Н. Яненко оказались перечислены имена наиболее выдающихся отечественных математиков XIX в., подавляющего большинства крупнейших математиков континентальной Европы XVII - второй половины XIX вв., а также выдающихся астрономов, физиков, медиков, философов, богословов православия, католицизма, англиканства и лютеранства. Кроме того, проанализировано научное сотрудничество Н.Н. Яненко, зафиксированное в Collaboration Distance Project. Установлено, что расстояние соавторства академика Н.Н. Яненко до наиболее известных математиков и физиков ХХ-XXI вв. составляет 3-5.
The present work is devoted to the 100th anniversary of the distinguished Soviet specialist in mathematics and mechanics, academician of the Academy of Sciences of the USSR, Hero of Socialist Labor Nikolai Nikolaevich Yanenko. A detailed analysis of N.N. Yanenko scientific genealogy using the “Mathematical genealogy” project is given. It is demonstrated that the scientific genealogy of N.N. Yanenko contains the name of the most prominent national mathematician of the 19th century, the majority of leading mathematician of the continental Europe of the 16th - 2nd half of the 19th centuries, as well as prominent astronomers, physicists, physicians, philosophers, theologians of the Eastern Orthodox Church, Catholicism, Anglicanism, Lutheranism. The scientific cooperation of N.N. Yanenko is analyzed using the Collaboration Distance Project. The co-authorship distance from N.N. Yanenko to the most famous mathematician and physicists of the 20th-21th centuries is computed to be equal to 3-5.
Automatic definition of web service call zones based on the classification of context of the mobile device
Authors: Воскобойников Михаил Леонтьевич , Федоров Роман Константинович , Ружников Геннадий Михайлович 
Published: August 2021

Предложен метод автоматизации активации устройств Интернета вещей на основе классификации геопозиции мобильного устройства. В отличие от других методов пользователь обучает систему активации устройств с помощью примеров и контрпримеров, что значительно снижает требования к квалификации пользователя. Проведено тестирование метода на таких двух устройствах, как шлагбаум и электромеханический замок двери. Полученные результаты тестирования позволяют судить о работоспособности метода и возможности его использования в системах умного дома и города.
Most IoT devices provide an application programming interface such as web service that allows controlling these IoT devices over Internet using a mobile phone. Activation of IoT devices is performed according to the status of user behavior. Both user behavior and activation of IoT devices are periodical. An activation of IoT device is often related with a user geolocation which can be defined by sensors of the mobile device. A method for automated activation of IoT devices based on classification of geolocation of mobile device is proposed. The method implements a supervised learning that simplifies automate activation of IoT devices for the end users. Existing methods demand appropriate end user qualification and require long time to automate activation. For indoor geolocation of the mobile device information from Wi-Fi access points and geolocation GPS sensor is utilized. Data of Wi-Fi and GPS sensors is used to form context of a mobile device. Based on context examples of invoking/not invoking web services the spatial areas are formed. When the mobile device context is within the web service invocation area, the web service is invoked and the associated IoT device is activated. To implement the method, an Android application was developed. The method was tested on a training set that contained 100 training examples of calling two web services: opening an electromechanical door lock and opening a barrier. As a result of testing, the accuracy of classifying the context of a mobile device was 98 percent. The results obtained can be used in the development of smart home and smart city systems.
High efficient method for calculating the Straton - Chu integral for problems of interaction of laser radiation with materials
Authors: Жуков Владимир Петрович , Федорук Михаил Петрович 
Published: August 2021

Описан высокоэффективный метод вычисления интеграла Стрэттона-Чу для определения электромагнитного поля, создаваемого отражением плоскопараллельного лазерного импульса от параболического зеркала. Рассмотрены импульс с постоянной во времени амплитудой и импульс фемтосекундной длительности, с зависимостью от времени в виде функции Гаусса. Описанный метод актуален для решения задач о взаимодействии сильно сфокусированных лазерных импульсов с веществом
The interaction of femtosecond laser pulses with materials is usually modelled within the approach of nonlinear Maxwell equations. The laser pulse in the calculations is initiated by specifying the conditions for the electric field at the boundary of the computational domain, which is located at a distance of 100-200 micron from the focus. The usually used Gaussian distribution for the radius and time in the boundary conditions are not applicable for such pulses. It is necessary to consider a real optic system, or a system, which can be realized. In the presented paper we address the situation in which the laser pulse is created by the reflection of parallel pulse from a parabolic mirror. To determine the field near the focus we use the Stratton-Chu integral (SCI), with fast oscillating sub-integral function. It makes very difficult to calculate SCI. In the presented paper a highly efficient method allows to overcome this difficulty. The main idea is that a change of variables is made in the integral, which, in the case of a short pulse being important for applications, allows calculating the integral over one of the variables once for all times. In addition, for this variable, the integrand is smooth and its calculation does not require large computational resources. The paper investigates the accuracy of calculating the SCI by the proposed method and demonstrates its high efficiency