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检索条件"机构=Faculty of Automation and Computer Engineering Novosibirsk State Technical University"

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Novel Models on Packed Bed Solar Air Collectors

Novel Models on Packed Bed Solar Air Collectors

引用

2022 Conference of Russian Young Researchers in Electrical and Electronic engineering, ElConRus 2022

作者： Rafaat, Amr E. Hassan, A.A.M. Kotin, Denis A. Diab, Ahmed A. Zaki Ezzat, A.A. El-Minia High Institute of Engineering and Technology Dept. of Mechatronics Engineering Minia Egypt Minia University Faculty of Engineering Dept. of Power Eng. and Energy Minia Egypt Novosibirsk State Technical University Department of Electric Drive and Automation of Industrial Installations Novosibirsk Russia Minia University Faculty of Engineering Dept. Electrical Engineering Minia Egypt

ISBN: (纸本)9781665409933

This paper presents three different models for solar air collectors (SACs). Novel theoretical modeling of the overall performance of the thermohydraulic for solar air collectors having their duct full of blackened spherical particles (cupper spheres) has been introduced. The impact of the airflow course on the collector's powerful performance is investigated. In this investigation, fashions were proposed for airflow. In the first method (Model I), the air flows were parallel to the glass cover, whereas, within the second method (Model II), the air flows in a direction this is perpendicular to the glass cover. An evaluation has been made among the thermal performances of the sun air collector corresponding to each of the two airflow direction models for the equal duct depth and equal operating situations. It can be determined that there may be a considerable effect of airflow direction on overall thermal performance. The steady-state warmness balance equations for the packed bed collector are shown. A numerical answer turned into obtained for a wide variety of impartial parameters. The effects of various parameters on thermohydraulic overall performance are mentioned. The hole air temperature, thermal efficiency, and effective efficiency might be received. Its miles discovered the mass waft rates affect the overall collector performance extensively. Similarly, an evaluation between the performances of a packed bed collector (Model I) and its duct full of the blackened cord mesh display matrix are supplied. Its miles discovered that the round bed packed sun air collector (Model I) offers a more effective performance than the wire mesh packed air creditors. © 2022 IEEE.

关键词： Packed beds

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university’s Educational Environment Personalization Based on the Ontological Models

University’s Educational Environment Personalization Based ...

引用

Annual Siberian Russian Workshop on Electron Devices and Materials (EDM)

作者： Natalya V. Pustovalova Tatiana V. Avdeenko Alexandra V. Pustovalova dept. Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russian Federation dept. Applied Mathematics and Computer Science Novosibirsk State Technical University Novosibirsk Russian Federation

ISBN: (数字)9781665498043

ISBN: (纸本)9781665498050

The paper presents a work in progress. Personalization of the educational environment allows improving the quality of the educational process, raising it to a new level. Our development is intended to diagnose and recommend educational content, depending on the students’ personality. This article describes a system of ontological models (Learner Model, educational content model and cognitive functions model) designed to diagnose students’ characteristics and the subsequent issuance of educational content, taking into account these characteristics. The learner model, implemented as a Protege ontology, is based not only on human professional experience but also on student testing results. This approach, based on the use of various IQ tests, allows reflecting in the ontology the dependencies identified due to linear regression methods, as well as other types of analysis. By this way we will reduce the dependence of the model on the human expert’s personality and make it more objective. Using the Protege tools, we will combine three ontologies in the architecture of a personalized environment through rules and axioms.

关键词： Linear regression Ontologies Electron devices Testing

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On the Inapplicability of the Padé Approximation for Controlling Object Consisting of Delay Link and Integrator 15

On the Inapplicability of the Padé Approximation for Contro...

引用

15th International Scientific-technical Conference on Actual Problems of Electronic Instrument engineering, APEIE 2021

作者： Zhmud, Vadim A. Dimitrov, Lubomir V. Sablina, Galina V. Roth, Hubert Stukach, Oleg V. Novosibirsk State Technical University Institute of Laser Physics SB RAS Dept. of Automation Novosibirsk Russia Technical University of Sofia Mechanical Engineering Faculty Sofia Bulgaria University of Siegen Faculty of Electrical Engineering and Informatics Siegen Germany Novosibirsk State Technical University Dept. of Information Defense Novosibirsk Russia Higher School of Economics Moscow Russia

ISBN: (纸本)9781665434089

The well-known Pade formula is used to approximate the pure delay link. By means of preliminary studies using the modeling method, it was determined that object whose model consists of a series-connected delay link and an integrator is problematic. This paper examines the possibility of using the Pade formula for calculating controllers for objects that are a series connection of an integrator and a delay link. The paper offers the results of research by modeling in the VisSim software. The method of numerical optimization in numerical simulation showed that in this case such an approximation does not effectively solve the problem. Improving the approximation accuracy by increasing the order of the approximating relation does not solve the problem. This paper analyzes the reasons for this discrepancy and proposes an original approximation formula free of these shortcomings. It is shown that the application of the proposed approximation formula makes it possible to effectively and with high accuracy solve the synthesis problem. The results of modeling a system with an exact model and with the proposed model for approximation coincide with high accuracy, which is shown by an example. © 2021 IEEE.

关键词： Numerical methods

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Research and Development of the Convolutional Neural Network for Pneumonia Recognition in Radiographs

Research and Development of the Convolutional Neural Network...

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Annual Siberian Russian Workshop on Electron Devices and Materials (EDM)

作者： Konstantin O. Antonov Olga K. Alsova Faculty of Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russia

In this paper, we present the results and analysis of using the convolutional neural network (CNN) for pneumonia recognition in radiographs. The network architecture was developed, and the author's software implementation of the CNN model using TensorFlow / Keras framework is proposed. The classes in the dataset are imbalanced, and we used a combination of approaches to prevent overfitting problem such as increasing the cost of classification mistakes on the minority class, increasing the amount of data (data augmentation), exclusion of a certain percentage of neurons during training (dropout) and others. The model gave us the next results: accuracy is 0.91, precision is 0.9, recall is 0.97, roc-auc is 0.96. The obtained results allow making a conclusion about the effectiveness of using the developed CNN model for pneumonia recognizing.

关键词： Radiography Training Image recognition Microorganisms Pulmonary diseases Neurons Network architecture

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Development of Software for Automated Marking of Vertebral Bodies

Development of Software for Automated Marking of Vertebral B...

引用

IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics engineering, SIBIRCON

作者： D. Piletskii A. Gladkov A. Yakimenko Faculty of Automation and Computer Engineering Novosibirsk State Technical University Novosibirsk Russia Department of Data Acquisition and Processing Systems Novosibirsk State Technical University Novosibirsk Russia Laboratory of Geophysical Informatics Institute of Computational Mathematics and Mathematical Geophysics SB RAS Novosibirsk Russia

ISBN: (纸本)9781665464819

in order to create a digital twin of the spine to simulate the behavior of the spine after various interventions, the task of automating the marking of the vertebral bodies on radiographs was formulated. The presented work describes the developed approaches to solving the problem of marking the vertebral bodies on radiographs, and also describes algorithms for extracting images of the spine and images of individual vertebrae. For the detection of images of each individual vertebra, the YOLOv5 model was used, and an ensemble of regression models was created to solve the problem of marking the image of each individual vertebra. After a series of experiments, marking errors were estimated at 4.6% using the ratio of coordinates obtained using trained models and correctly marked data. Theories were also put forward about the possible improvement of the created software by dividing the vertebrae into two subclasses in order to reduce the markup error to the desired 0.8%.

关键词： Radiography Image recognition Software algorithms Brightness X-ray diffraction Data models Software

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Electric Arc Plasma Unit with Controlled Electric Arc for Surface Treatment of Metal Products 3

Electric Arc Plasma Unit with Controlled Electric Arc for Su...

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3rd International Conference on Control Systems, Mathematical Modeling, automation and Energy Efficiency, SUMMA 2021

作者： Meshcheryakov, Viktor Pikalov, Vladimir Valtchev, Stanimir Lipetsk State Technical University Automation and Computer Science Faculty Lipetsk Russia Nova University of Lisbon Department of Electrical Engineering Caparica Portugal

ISBN: (纸本)9781665439817

The design of an electric arc plasma unit with a cylindrical hollow working chamber and controlled electric arc producing low-Temperature plasma, which can be used for surface treatment of metal products, is considered. The design of a regulated power supply of the electric arc part of the installation with a capacitor matching circuit and a pulse control unit of the electric arc current is proposed. The arc current continuity is ensured when regulating the power released in the electric arc. The amount of plasma produced is regulated by simultaneously changing the current in the arc and the flow of plasma-forming gas supplied to the arc burning area. The arc position is stabilized by creating an external electromagnetic field. An experimental electric arc plasma unit with a cylindrical working chamber and consumable graphite electrodes was created. The correlation between the power of the main elements of the unit is determined experimentally. The results of the study of processes occurring during electromagnetic arc drawing and plasma production are presented. © 2021 IEEE.

关键词： Electromagnetic fields

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Web-applications Fault Tolerance and Autoscaling Provided by the Combined Method of Databases Scaling 12

Web-applications Fault Tolerance and Autoscaling Provided by...

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12th International Conference on Advanced computer Information Technologies, ACIT 2022

作者： Korobeinikova, Tetiana Maidaniuk, Volodymyr Romanyuk, Olexandr Chekhmestruk, Roman Romanyuk, Oksana Romanyuk, Sergey Institute of Computer Technologies Automation and Metrology Lviv Polytechnic National University Lviv Ukraine Vinnytsia National Technical University Faculty of Information Technologies and Computer Engineering Vinnytsia Ukraine 3D Generation Ua Vinnitsa Ukraine Institute of Computer Systems Odessa Polytechnic State University Odessa Ukraine

The purpose of this work is to accelerate the server applications operation at high load and to automate the server systems scaling processes, which allows to reduce the cost of infrastructure and its maintenance. ... 详细信息

ISBN: (数字)9781665410502

ISBN: (纸本)9781665466479

关键词： Database systems

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The removing of multiple reflections from a curved interface at the common-source seismogram

The removing of multiple reflections from a curved interface...

引用

2020 International Conference on Information Technology in Business and Industry, ITBI 2020

作者： Rabinovich, E.V. Demianenko, A.V. Turkin, A.S. Faculty of Automation and Computer Engineering Novosibirsk State Technical University Neti 20 Karla Marksa ave. Novosibirsk630073 Russia

The proposed simplified version of the original solution for the actual problem of removing multiple reflections from a curved interface at common-source seismogram is suggested. The solution to this problem is complicated in the framework of the approach based on using a reflected wave's hodograph. The proposed solution is based on the analytical expression for describing a reflecting interface structural form. The expression is obtained using the location algorithm based on solving only direct kinematic seismic problems. There is an analytical expression;one can calculate the propagation paths of the multiple reflections and its arrival times at the receivers of the observation base. If a seismic wavelet is detected in a limited range, including a multiple reflected wave arrival time, it is possible to remove the detected wavelet for eliminating its distorting effect to the direct reflected signal. © Published under licence by IOP Publishing Ltd.

关键词： Kinematics

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Effective Algorithm to Design PID-regulator by Numerical Optimization

Effective Algorithm to Design PID-regulator by Numerical Opt...

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2020 International Multi-Conference on Industrial engineering and Modern Technologies, FarEastCon 2020

作者： Zhmud, V. Dimitrov, L. Nosek, J. Novosibirsk State Technical University Department of Automation Novosibirsk Russia Faculty of Mechanical Engineering Sofia Bulgaria Institute of Mechatronics and Computer Engineering Technical University of Liberec Liberec Czech Republic

ISBN: (纸本)9781728169514

Automatic control systems are used in all areas of technology, their accuracy determines the accuracy of the work of robots, manipulators on conveyors, transport systems and high-precision measuring systems. Static error is always minimized through the use of integrating link in regulator. High dynamic accuracy can be ensured by the correct calculation of the proportional and derivative links. If the coefficients are not calculated correctly, the system may lose stability. The minimum dynamic error is ensured only with the most correctly designed regulator. The best design method in the case of a relatively complex mathematical model of the object is a method of numerical optimization. There are software tools for modeling such systems and optimizing regulator, such as VisSim, SimInTech, Simulink + MATLAB, Mathcad, and others. These systems do not use the best algorithms for the specific purpose of the synthesis of PID-regulator, but simply the most well-known numerical optimization algorithms, such as Powell, Polak-Ribiere, Fletcher-Reeves, Monte-Carlo. As a result, in some cases, the coefficients calculated by the regulator are not efficient enough. The paper proposes an improvement in the numerical optimization algorithm. The proposed algorithm was studied by numerical simulation using an example of an object taken from an article by other authors, which allowed us to compare the results obtained by these authors with the results of using this algorithm. Comparison showed that the proposed method is more effective than all the previously described methods. The choice of the best cost (goal) function for these purposes and optimization of the task and simulation time are also necessary. All recommendations are combined into a formal description of the proposed methodology for solving the problem © 2020 IEEE.

关键词： Optimization

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Justification of STATCOM Systems Efficiency as an Objective of Improving the Quality of Electricity in a Mining Enterprise

Justification of STATCOM Systems Efficiency as an Objective ...

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IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics engineering, SIBIRCON

作者： Sergey V. Mitrofanov Artem M. Balabanov Anastasia G. Rusina Yulia A Misnik Irina A. Shved Department of Power Supply Systems Faculty of Power Engeneering Novosibirsk State Technical University Novosibirsk Russia Department of Relay Protection and Automation of Power Systems Institute of Electrical Power Engineering Moscow Power Engineering Institute Moscow Russia Department of Power Plants Faculty of Power Engeneering Novosibirsk State Technical University Novosibirsk Russia

ISBN: (纸本)9781665464819

A harmonic filter is used as a part of the skip hoist of the majority of mining enterprises in Russia. The voltage increases as the hoisting machine decelerates and decreases as it accelerates. The harmonic filter cannot compensate for voltage deviations, flicker or upper harmonics deviations. The use of a STATCOM-type dynamic compensation device instead of a harmonic filter enables voltage stabilization at various skip hoist loadings. A STATCOM device allows for a higher (design) speed of the skip. A 15% speed growth of the skip hoist with the STATCOM device connected to it significantly increases or extraction without any constructive changes of the machine if compared to the usual skip speed achieved with an HF operation. This study provided a comparative analysis of technical characteristics of FACTS devices such as capacitor banks, static VAR compensators, synchronous compensators, and STATCOMs. It was proved that STATCOM is the most effective means of voltage level stabilization to be used at a skip hoist. The main conclusions were based on the simulation modelling in the Matlab Simulink environment. The model focused on the influence of different operating modes of the hoisting machine on the level of reactive power consumption, voltage level and harmonic components coefficients in the power distribution network of the mining enterprise.

关键词： Reactive power Voltage fluctuations Software packages Harmonic filters Harmonic analysis Automatic voltage control Mathematical models

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