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The use of triangulation processing algorithms for the construction of combined model of the underwater and above-water terrain of the bed of the Bratsk Reservoir

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IOP Conference Series: Earth and Environmental Science 2018年第1期190卷

作者： A S Gachenko A E Hmelnov T A Hmelnova G M Rugnikov Irkutsk Scientific Center of Siberian Branch of Russian Academy of Sciences Irkutsk Russia Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences Irkutsk Russia

The article summarizes the experience gained during processing of the data about the terrain of the Bratsk Reservoir bed. We discuss the available sources of information on the land and underwater terrain and justify the choice of the sources used in the project. To measure the actual depths in the regions of interest an echo-sounder of the consumer grade was applied, and we consider the processing of its measurements in some details. We describe the free, open source and custom software, which we apply for the processing of the data. We consider the use of the several algorithms that we have developed for processing of the terrain points. The main goal of this processing is to obtain the combined terrain model, which summarizes the data from the various information sources: the topographic maps, the pilot charts and the echo sounder measurements. All the algorithms considered build and process the triangulations of irregular sets of points. The algorithms used are: constrained Delaunay triangulation construction; removal of artefacts of triangulation, constructed from the terrain isolines; map morphing to reconcile the terrain models: and triangulation fragment replacement. The resulting combined terrain model contains all the information about the terrain in the area of interest and allows to use the model for the further hydrological calculations.

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A heuristic for large-scale p-median instances

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Electronic Notes in Discrete Mathematics 2003年 13卷 14-17页

作者： Avella, Pasquale Sassano, Antonio RCOST - Research Center of Software Technology Universitá del Sannio 82100 Benevento Corso Garibaldi 107 Italy Dipartimento di Informatica e Sistemistica Universitá di Roma La Sapienza 00185 Roma Via Buonarroti 12 Italy Centro di Ricerca in Matematica Pura e Applicata Università di Salerno 84084 Fisciano SA Via Ponte Don Melillo Italy Institute of System Dynamics and Control Theory Siberian Branch Russian Academy of Sciences 664033 Irkutsk Lermontov Srt. 134 Russian Federation

Given a digraph G(V,A), the p-Median problem consists of determining p nodes (the median nodes) minimizing the total distance from the other nodes of the graph. We present a simple heuristic for large scale instances, consisting of three steps. First a lagrangean relaxation is solved to provide a lower bound. Then a simple procedure is used to choose "promising variables", defining a core problem. Finally the core problem is solved to optimality by branch-and-bound to provide good quality upper bounds. Computational experience is reported for instances up to 5934 nodes, showing that the duality gap is never larger than 1%. © 2003.

关键词： core problem lagrangean relaxation p-Median

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Transverse momentum dependence of the T-even hadronic structure functions in the Drell-Yan process

arXiv

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arXiv 2024年

作者： Lyubovitskij, Valery E. Zhevlakov, Alexey S. Anikin, Iurii A. Institut für Theoretische Physik Universität Tübingen Auf der Morgenstelle 14 TübingenD-72076 Germany of ANID Fernández Concha 700 Santiago Chile Bogoliubov Laboratory of Theoretical Physics JINR Dubna141980 Russia Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134 Irkutsk664033 Russia Department of Physics Tomsk State University Tomsk634050 Russia

We present detailed analysis of the T-even lepton angular distribution in the Drell-Yan process including γ/Z0 gauge boson exchange and using perturbative QCD based on the collinear factorization scheme at leading order in the αs expansion. We focus on the study of the transverse momentum QT dependence of the corresponding hadronic structure functions and angular coefficients up to next-to-next-to-leading order in the Q2T/Q2 expansion. We analyze QT dependence numerically and compare T-even angular coefficients integrated over rapidity with available data of the ATLAS Collaboration at LHC. Additionally, we present our results for the forward-backward asymmetry and compare it with data. © 2024, CC BY.

关键词： Hadrons

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Geological Information system of environmental and human intervention impact assessment on bodies of water of the Irkutsk region

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IOP Conference Series: Earth and Environmental Science 2018年第1期190卷

作者： I V Bychkov A S Gachenko A E Hmelnov R K Fedorov E S Fereferov Irkutsk Scientific Center of Siberian Brunch of the Russian Academy of Science Irkutsk Russia Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences Irkutsk Russia

In this paper the authors present a methodology on information support for research on human and environmental impact of Lake Baikal. The geoportal placed on the Internet allows researchers to create a common thematic database (tabular data) and map data (information layers) within the framework of the project, as well as to run Internet services for geoprocessing and complex data analysis problems solving. One of the key features of the engineered geoportal is the ability for users to create the structure of their databases independently (to add, to delete and to modify the tables structure) as well as to configure the run of geoprocessing services. Besides this platform allows you to take on projects on various subjects and with a large number of users simultaneously. They have took on works on 3D modeling of the surface topography of the coastal zone near the village of Listvyanka. Underwater terrain is combined with land relief. As a result catchment basins along which pollutants with groundwater enter the coastal waters of Lake Baikal have been identified. The data on pollution concentration sites is confirmed by practical measurements and coincides with the drainage areas.

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Subject-oriented computing environment for solving large-scale problems of energy security research

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Journal of Physics: Conference Series 2019年第5期1368卷

作者： I V Bychkov G A Oparin A G Feoktistov I A Sidorov S A Gorsky R O Kostromin A V Edelev Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov Street 134 Irkutsk Russia 664033 Melentiev Energy Systems Institute SB RA Lermontov Street 130 Irkutsk Russia 664033

We represent a new approach to the development and use of a subject-oriented heterogeneous distributed computing environment for solving large-scale problems of energy security research. Both the development of scalable applications (distributed applied software packages) and the computing resources integration are conducted using the Orlando Tools framework. It supports the collaborative application development based on the continuous integration of their software. Computation management tools in Orlando Tools are integrated with a multi-agent system. We propose special multi-agent tools for the heterogeneous resource allocation in the environment. These tools apply knowledge about the subject domain specifics of solved-problems and computing environment characteristics. The effectiveness of such management is highlighted by the results of solving practical problems of energy security research.

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Russian–German Astroparticle Data Life Cycle Initiative

arXiv

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arXiv 2018年

作者： Bychkov, Igor Demichev, Andrey Dubenskaya, Julia Fedorov, Oleg Haungs, Andreas Heiss, Andreas Kang, Donghwa Kazarina, Yulia Korosteleva, Elena Kostunin, Dmitriy Kryukov, Alexander Mikhailov, Andrey Nguyen, Minh-Duc Polyakov, Stanislav Postnikov, Evgeny Shigarov, Alexey Shipilov, Dmitry Streit, Achim Tokareva, Victoria Wochele, Doris Wochele, Jürgen Zhurov, Dmitry Matrosov Institute for System Dynamics and Control Theory Siberian Branch of Russian Academy of Sciences Lermontov st. 134 P. O. Box 292 Irkutsk664033 Russia Irkutsk State University Karl Marks st. 1 Irkutsk664003 Russia Moscow119991 Russia Applied Physics Institute Irkutsk State University Gagarin Blvd. 20 Irkutsk664003 Russia Institute for Nuclear Physics Karlsruhe Institute of Technology KIT Karlsruhe76021 Germany Steinbuch Centre for Computing Karlsruhe Institute of Technology KIT Karlsruhe76021 Germany

Modern large-scale astroparticle setups measure high-energy particles, gamma rays, neutrinos, radio waves, and the recently discovered gravitational waves. Ongoing and future experiments are located worldwide. The data acquired have different formats, storage concepts, and publication policies. Such differences are a crucial point in the era of Big Data and of multi-messenger analysis in astroparticle physics. We propose an open science web platform called *** which enables us to publish, store, search, select, and analyze astroparticle data. In the first stage of the project, the following components of a full data life cycle concept are under development: describing, storing, and reusing astroparticle data;software to perform multi-messenger analysis using deep learning;and outreach for students, post-graduate students, and others who are interested in astroparticle physics. Here we describe the concepts of the web platform and the first obtained results, including the meta data structure for astroparticle data, data analysis by using convolution neural networks, description of the binary data, and the outreach platform for those interested in astroparticle physics. The KASCADE-Grande and TAIGA cosmic-ray experiments were chosen as pilot examples. Copyright © 2018, The Authors. All rights reserved.

关键词： Gamma rays

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Robust formation control of autonomous underwater vehicles with actuator saturations under discrete-time periodic communications

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AIP Conference Proceedings 2018年第1期2046卷

作者： Sergey Ul’yanov Nikolay Maksimkin Ksenia Bedenko 1Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences 664033 Lermontov str. 134 Post Box 292 Irkutsk RUSSIAN FEDERATION

In this paper, a new leader-follower formation control scheme for multiple autonomous underwater vehicles (AUV) networked by sampled-data information is proposed. We consider the case when the leader of the fleet follows a predefined path, whereas other vehicles try keep a desired formation while tracking the maneuvers of the leader. Under the proposed scheme, each vehicle as a leader in the formation periodically samples and transmits to its followers information about its position in global reference frame. The follower, based on the received information, its own sampled data, and the reference path parameters spread over communication network, computes the relative positioning errors and desired motion parameters to feed them to a local controller. Feedback gains of the distributed control system that ensure stability (dissipativity) of formation are synthesized with the use of the vector Lyapunov function technique adopted for sampled-data control system design taking into account communication delays, measurement errors, and saturation of control signals. Some simulation results are provided to demonstrate the effectiveness of the proposed control scheme.

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DC-DC Converters Optimization in Case of Large Variation in the Load

arXiv

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arXiv 2024年

作者： Domyshev, Alexander Chistyakova, Elena Dreglea, Aliona Sidorov, Denis Liu, Fang Melentiev Energy Systems Institute Siberian Branch Russian Academy Sciences Irkutsk Russia Harbin Institute of Technology Harbin China Irkutsk National Research Technical University Irkutsk Russia Institute for System Dynamics and Control Theory Siberian Branch Russian Academy Sciences Irkutsk Russia Department of Automation Central South University Changsha China

The method for controlling a DC-DC converter is proposed to ensures the high quality control at large fluctuations in load currents by using differential gain control coefficients and second derivative control. Various implementations of balancing the currents of a multiphase DC-DC converter are discussed, with a focus on achieving accurate current regulation without introducing additional delay in the control system. Stochastic particle swarm optimization method is used to find optimal values of the PID controller parameters. An automatic constraint-handling in optimization are also discussed as relevant techniques in the *** Codes 34H05 34A09 © 2024, CC BY.

关键词： Stochastic systems

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Methods and software tools for computer-aided design of the spacecraft guidance, navigation and control systems

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AIP Conference Proceedings 2017年第1期1798卷

作者： Yevgeny Somov Gennady Oparin 1Samara State Technical University Samara 443100 Russia 2Matrosov Institute for System Dynamics and Control Theory Siberian Branch Russian Academy of Sciences Irkutsk 664033 Russia

We shortly present results on development and employment of the software systems for computer-aided design of the spacecraft guidance. navigation and control systems – modeling, synthesis, nonlinear analysis, simulat...

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On an exact solution to the nonlinear heat equation with a source

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Journal of Physics: Conference Series 2021年第1期1847卷

作者： A L Kazakov A A Lempert L F Spevak Matrosov Institute for system dynamics and control theory SB RAS 134 Lermontov str. 664033 Irkutsk Russia Institute of Engineering Science UB RAS 34 Komsomolskaya str. 620049 Ekaterinburg Russia

The paper is devoted to the study of a singular nonlinear second-order parabolic equation, which is called the porous medium equation or the nonlinear heat equation. One of the important classes of its solutions is heat waves propagating over a zero background with a finite velocity. This property is not typical for parabolic equations and is a consequence of singularity. The main object of study is exact solutions of mentioned type. A new way of separating variables is used to represent them. We obtain conditions when it is possible to make a reduction to the Cauchy problem for an ordinary second-order differential equation with a singularity. It is shown that the Cauchy problem describes a heat wave whose front moves exponentially. We construct a solution to the Cauchy problem as a power series and determine the cases when the series breaks off, i.e. the solution has the form of a polynomial, and the corresponding heat wave can be written explicitly. If the Cauchy problem cannot be explicitly integrated, the solution is constructed numerically. An algorithm based on the boundary element method is proposed. We perform a computational experiment and conclude the properties of the found solutions. Besides, the accuracy of the calculation results is analyzed.

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