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15th International Conference on Optimization and Applications, OPTIMA 2024

作者： Gornov, Alexander Anikin, Anton Sorokovikov, Pavel Zarodnyuk, Tatiana Matrosov Institute for System Dynamics and Control Theory of SB RAS Lermontov Str. 134 Irkutsk664033 Russia

ISBN: (纸本)9783031791185

The article discusses a novel approach for optimizing atomic-molecular structures in extra-large clusters, focusing on reducing computational complexity and applying parallel computing techniques. A three-stage computation process is outlined, offering benefits over traditional algorithms by efficiently navigating through multi-extremal optimization challenges. The software, based on this methodology, demonstrated high efficacy in solving complex molecular dynamics problems. When comparing the outcomes with experimental data, no significant deviations from the expected patterns in potential values were detected. The developed three-stage numerical approach proved instrumental in solving optimization tasks for extra-large atomic-molecular systems. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Molecular dynamics

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BV solutions of rate independent processes driven by impulsive controls

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IFAC-PapersOnLine 2018年第32期51卷 361-366页

作者： Samsonyuk, Olga N. Timoshin, Sergey A. Matrosov Institute for System Dynamics and Control Theory of SB RAS Irkutsk Russia

An extension to discontinuous inputs of bounded variation of the play operator is presented. The motivation for such an extension comes from optimal impulsive control problems with hysteresis. The latter is introduced by means of variational inequalities modeling the action of the play operator on the BV-inputs. Our extension is applied to the graph completions of BV-functions and it allows us to study impulsive control systems characterized by measure-driven differential equations with nonlinear terms of hysteresis type. Some approximation results for impulsive processes are also provided. © 2018

关键词： Process control Differential equations Hysteresis Nonlinear equations Variational techniques Approximation results impulsive Impulsive control systems Impulsive controls Optimal controls Optimal impulsive control Rate independent process Variational inequalities

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Optimality conditions with feedback controls for optimal impulsive control problems

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IFAC-PapersOnLine 2018年第32期51卷 509-514页

作者： Dykhta, Vladimir A. Samsonyuk, Olga N. Matrosov Institute for System Dynamics and Control Theory of SB RAS Irkutsk Russia

This paper concerns with optimal impulsive control problems with trajectories of bounded variation. Necessary optimality conditions based on weakly monotone solutions of the Hamilton Jacobi inequality and feedback controls are discussed. A particular attention is paid to necessary optimality conditions with feedback controls, called Feedback minimum principle. The latter is generalized the corresponding principle for classical optimal control problems and is formulated in terms of Pontryagin Maximum Principle. An example illustrating these results is considered. © 2018

关键词： Feedback control Differential equations Optimal control systems Bounded variations Hamilton Jacobi inequality Impulsive controls Minimum Principles Necessary optimality condition Optimal control problem Optimal impulsive control Optimality conditions

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Angular coefficients of the Drell-Yan process across different rapidity and kinematical ranges

arXiv

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arXiv 2025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 Joint Institute for Nuclear Research 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 comprehensive analysis of the angular structure of the Drell-Yan process at different rapidity and kinematical ranges using data of the ATLAS, LHCb, and CMS Collaborations at CERN LHC. From theory side we discuss next-to-leading order calculations in the framework of the collinear perturbative QCD and geometrical method. © 2025, CC BY.

关键词： Angular distribution

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Digital platform for forest resources monitoring in the BAIKAL natural territory 13

Digital platform for forest resources monitoring in the BAIK...

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13th Multiconference on control Problems, MCCP 2020

作者： Bychkov, I.V. Ruzhnikov, G.M. Fedorov, R.K. Popova, A.K. Matrosov Institute for System Dynamics and Control Theory Sb Ras Irkutsk Russia

Forest is the most important natural resource of the Baikal natural territory (BNT), which ensures sustainable development of the ecological system of the Lake Baikal, performing water protection, soil protection and water regulation functions. The article describes the issues of transition to a new technological order - the creation of a digital monitoring platform to support the rational use of forests. We formulate characteristics of the current state of forests and analyze the problems of forest resources monitoring in the BNT. We consider the types of digital platforms of different levels and propose basic requirements for forest digital monitoring. © Published under licence by IOP Publishing Ltd.

关键词： Lakes

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The sphere packing problem into bounded containers in three-dimension non-Euclidean space

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IFAC-PapersOnLine 2018年第32期51卷 782-787页

作者： Kazakov, A.L. Lempert, A.A. Ta, T.T. Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia Irkutsk National Research Technical University Irkutsk Russia

This paper deals with the problem of optimal packing a given number of equal spheres into different closed sets. We consider the problem both in three-dimensional Euclidean and non-Euclidean spaces. The special algorithm based on optical-geometric approach is suggested and implemented. This approach is previously used only for packing circles in two-dimensional space. Numerical results are presented and discussed. © 2018

关键词： Spheres

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An Improved SAT-Based Guess-and-Determine Attack on the Alternating Step Generator 20th

An Improved SAT-Based Guess-and-Determine Attack on the Alte...

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20th International Conference on Information Security, ISC 2017

作者： Zaikin, Oleg Kochemazov, Stepan Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia

ISBN: (纸本)9783319696584

In this paper, we propose an algorithm for constructing guess-and-determine attacks on keystream generators and apply it to the cryptanalysis of the alternating step generator (ASG) and two its modifications (MASG and MASG0). In a guess-and-determine attack, we first "guess" some part of an initial state and then apply some procedure to determine, if the guess was correct and we can use the guessed information to solve the problem, thus performing an exhaustive search over all possible assignments of bits forming a chosen part of an initial state. We propose to use in the "determine" part the algorithms for solving Boolean satisfiability problem (SAT). It allows us to consider sets of bits with nontrivial structure. For each such set it is possible to estimate the runtime of a corresponding guess-and-determine attack via the Monte-Carlo method, so we can search for a set of bits yielding the best attack via a black-box optimization algorithm augmented with several SAT-specific features. We constructed and implemented such attacks on ASG, MASG, and MASG0 to prove that the constructed runtime estimations are reliable. We show, that the constructed attacks are better than the trivial ones, which imply exhaustive search over all possible states of the control register, and present the results of experiments on cryptanalysis of ASG and MASG/MASG0 with total registers length of 72 and 96, which have not been previously published in the literature. © 2017, Springer International Publishing AG.

关键词： Monte Carlo methods

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Analysis of service calls for construction of the semantic network of services 1

Analysis of service calls for construction of the semantic n...

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1st Scientific-Practical Workshop on Information Technologies: Algorithms, Models, systems, ITAMS 2018

作者： Fedorov, Roman K. Shumilov, Alexander S. Voskoboynikov, Mikhail L. Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia

The paper proposes a method for obtaining the missing information in the construction of a semantic network, based on the analysis of statistical data about the service use by users. The advantage of the method is that the semantic connection between the two services is confirmed by a workable example demonstrating the transfer of data from one service to another. In addition, together with the semantic network, we obtain the connectivity of the parameters by the data, the possible values of the parameters, the frequency characteristics of users' use of services and their compositions, the time of the services execution, etc. © 2018 CEUR-WS. All rights reserved.

关键词： Data transfer

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Implementation of a brute force attack on the A5/1 keystream generator in a GPU-based volunteer computing project 3

Implementation of a brute force attack on the A5/1 keystream...

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3rd International Conference BOINC-Based High Performance Computing: Fundamental Research and Development, BOINC:FAST 2017

作者： Bulavintsev, Vadim Semenov, Alexander Zaikin, Oleg Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia

We present an advanced brute force attack on the A5/1 keystream generator, that is still widely used in modern GSM networks. To greatly reduce the search space, we use a well-known idea, introduced by R. Anderson more than 20 years ago. The main contribution of the present paper is the implementation of Anderson's attack on a GPU platform in bit-slice technique. The preliminary estimates of the attack's speed showed that, with the use of GPUs processing power, the attack could be performed in the real time on a modern computer cluster or in a volunteer computing project. To verify our estimates with the use of the BOINC technology we launched a volunteer computing project and executed our variant of Anderson's attack within it. As a result, 10 A5/1 cryptanalysis problems were solved in 7 days in the project. The results presented in this work provide yet another proof of A5/1's cryptographic weakness that shows that this generator is totally unsuitable for transmission of any kind of sensitive data through modern GSM networks. Copyright © by the paper's authors. Copying permitted for private and academic purposes.

关键词： Graphics processing unit

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On Solving Bilevel Optimization Problems with a Nonconvex Lower Level: The Case of a Bimatrix Game 20th

On Solving Bilevel Optimization Problems with a Nonconvex Lo...

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20th International Conference on Mathematical Optimization theory and Operations Research, MOTOR 2021

作者： Orlov, A.V. Matrosov Institute for System Dynamics and Control Theory of SB of RAS Irkutsk Russia

ISBN: (纸本)9783030778750

This paper addresses the optimistic statement of one class of bilevel optimization problems (BOPs) with a nonconvex lower level. Namely, we study BOPs with a convex quadratic objective function at the upper level and with a bimatrix game at the lower level. It is known that the problem of finding a Nash equilibrium point in a bimatrix game is equivalent to the special nonconvex optimization problem with a bilinear structure. Nevertheless, we can replace such a lower level with its optimality conditions and transform the original bilevel problem into a single-level nonconvex optimization problem. Then we apply the original Global Search theory (GST) for general D.C. optimization problems and the Exact Penalization theory to the resulting problem. After that, a special method of local search, which takes into account the structure of the problem under consideration, is developed. © 2021, Springer Nature Switzerland AG.

关键词： Local search (optimization)

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