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Necessary and Sufficient Conditions of Rolling and Sliding of a Spherical Shell in a Helical Channel

Computational mathematics and Modeling 2018年第3期29卷 275-286页

作者： Belolipetskii, A.A. Malinina, E.A. Semenov, K.O. Faculty of Computational Mathematics and Cybernetics Moscow State University Moscow Russian Federation Dorodnicyn Computing Centre Russian Academy of Sciences Moscow Russian Federation

We investigate the conditions when the motion of a heavy ball in a helical channel takes the form of rolling or rolling with partial sliding. This problem is relevant for the manufacturing technology of unsuspended spherical laser targets being developed at the thermonuclear target laboratory at the Lebedev Physics Institute of the Russian Academy of Sciences. While moving through the cryostat channel, the laser target may slide part of the way, which causes undesirable damage to its surface. We study the possible motion regimes with the objective of determining the optimal regime that minimizes the sliding length. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

关键词： cryogenic channel helical channel laser target motion of a heavy ball rolling rolling with partial sliding

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An Approach for Analyzing Influence Factors on Performance of Implementations of Standard Algorithms

An Approach for Analyzing Influence Factors on Performance o...

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

作者： Artem Zheltkov Dmitry Nikitenko Faculty of Computation Mathematics and Cybernetics Lomonosov Moscow State University Moscow Russia Research Computing Center Lomonosov Moscow State University Moscow Russia

This paper illustrates the approach for inspecting factors of hardware details and computing problems that impact the performance of typical computing applications and for estimating its influence. The approach extends the idea of supercomputing lists (like TOP500, Graph500, HPCG and others) and combines it with researching algorithms properties (given by AlgoWiki). Possible applications of the approach are described and the main principles of the implementation are given.

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FIRE6: Feynman integral reduction with modular arithmetic

arXiv

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arXiv 2019年

作者： Smirnov, A.V. Chukharev, F.S. Research Computing Center Moscow State University Moscow119992 Russia Karlsruhe76128 Germany Faculty of Computational Mathematics and Cybernetics Moscow State University Moscow119992 Russia

FIRE is a program performing reduction of Feynman integrals to master integrals. The C++ version of FIRE was presented in 2014. There have been multiple changes and upgrades since then including the possibility to use multiple computers for one reduction task and to perform reduction with modular arithmetic. The goal of this paper is to present the current version of FIRE. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum theory

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On Some Transformations of Features in Machine Learning in Medicine

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Pattern Recognition and Image Analysis 2018年第4期28卷 720-736页

作者： Zhuravlev, Yu. I. Ryazanov, V.V. Sen’ko, O.V. Dokukin, A.A. Afanas’ev, P.A. Dorodnitsyn Computing Center Federal Research Center "Informatics and Control" Russian Academy of Sciences Vavilova str. 44 Building 2 Moscow119333 Russia Faculty of Computational Mathematics and Cybernetics Moscow State University Lomonosovsky pr. 27/7 Moscow119992 Russia

A new view is given to supervised classification problems by precedents on the basis of logical approaches and the possibility of their application in medicine. The basic logical and logical statistical models of classification (basic definitions, search, processing, and application of logical regularities of classes (LRCs);transition to other feature spaces;and the method of optimal reliable decompositions) and their verification are presented. Numerous applications in medicine and two problems of qualification assessment and choice of the treatment method are considered. © 2018, Pleiades Publishing, Ltd.

关键词： Supervised learning

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Influence of the vacuum polarization effect on the motion of charged particles in the magnetic field around a Schwarzschild Black Hole

arXiv

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arXiv 2019年

作者： Pavlović, Petar Saveliev, Andrey Sossich, Marko Department of Physics Ramashna Mission Vivekananda Educational and Research Institute Belur MathWest Bengal711202 India Institute of Physics Mathematics and Information Technology Immanuel Kant Baltic Federal University Ul. Aleksandra Nevskogo 14 Kaliningrad236016 Russia Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University GSP-1 Leninskiye Gory 1-52 Moscow119991 Russia Faculty of Electrical Engineering and Computing Department of Physics University of Zagreb Unska 3 Zagreb10 000 Croatia

The consequences of the vacuum polarization effect in magnetic fields around a Schwarzschild Black Hole (SBH) on the motion of charged particles are investigated in this work. Using the weak electromagnetic field approximation, we discuss the non-minimal coupling between magnetic fields and gravity caused by the vacuum polarization and study the equations of motion for the case of a magnetic field configuration which asymptotically approaches a dipole magnetic field. It is shown that the presence of non-minimal coupling can significantly influence the motion of charged particles around Black Holes. In particular, the vacuum polarization effect, leading to strong amplification or suppression of the magnetic field strength around the event horizon (depending on the sign of the coupling parameter), can affect the scattering angle and minimal distance for the electrons moving in the gravitational field of the Black Hole as well as the dependence of these parameters on the asymptotic magnetic field strength, initial distance and the Black Hole mass. It is further demonstrated that the non-minimal coupling between gravity and astrophysical magnetic fields, caused by the vacuum polarization, can cause significant changes of the parameter space corresponding to bound trajectories around the Black Hole. In certain cases, the bounded or unbounded character of a trajectory is determined solely by the presence of non-minimal coupling and its strength. These effects could in principle be used as observational signatures of the vacuum polarization effect and also to constrain the value of the coupling parameter. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravitation

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Computation scheduling in multiprocessor systems with several types of additional resources and arbitrary processors

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Moscow University Computational mathematics and cybernetics 2017年第3期41卷 145-151页

作者： Furugyan, M.G. Faculty of Computational Mathematics and Cybernetics Moscow State University Moscow 119991 Russian Federation Dorodnitsyn Computing Center Federal Research Center “Computer Science and Control” Russian Academy of Sciences Moscow 119333 Russian Federation

The problem of feasible preemptive scheduling in a multiprocessor system is considered for when scheduled intervals are assigned, processor performance can be arbitrary, there are several types of additional resources, and the time for executing tasks depends linearly on the amount of additional resources allocated to them. Polynomial algorithms based on reducing the original problem to a flow problem and a linear programming problem are developed. © 2017, Allerton Press, Inc.

关键词： multiprocessor system preemptive scheduling resource allocation scheduled intervals

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Parallel structure of algorithms and training computational technology specialists

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Journal of Physics: Conference Series 2019年第1期1202卷

作者： A S Antonov Vl V Voevodin N N Popova Research Computing Center Lomonosov Moscow State University 119234 Russia Moscow Leninskie gory 1 bld. 4 Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University 119991 Russia Moscow Leninskie gory 1 bld. 52

A universal method for describing an algorithm's parallel structure was developed as a part of AlgoWiki Open Encyclopedia of Parallel Algorithmic Features. AlgoWiki is not just an important source of information on specific algorithms, but also a good training ground for students. To develop a high-quality algorithm description, one needs to study its structure, identify its key properties, obtain the data by practical experiments on a supercomputer and learn to visualize the results. This article describes the experience of conducting a computer lab course on parallel algorithm structure at the faculty of Computational mathematics and cybernetics at Lomonosov Moscow State University.

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Numerical Solution of the Two-Criterion Optimization Problem for the Shape of a Channel with a Moving Ball

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Computational mathematics and Modeling 2016年第1期27卷 9-19页

作者： Belolipetskii, A.A. Malinina, E.A. Dorodnicyn Computing Centre of the Russian Academy of Sciences Moscow Russian Federation Faculty of Computational Mathematics and Cybernetics Moscow State University Moscow Russian Federation

We calculate the parameters for the optimal design of a cryogenic system used to cool a HiPER laser target. The optimality criteria are minimum sliding time and maximum rolling time of the target in the system. The solution is obtained by simulating the motion of a spherical target through a curvilinear channel and constructing the set of criterion values and its Pareto boundary. © 2015, Springer Science+Business Media New York.

关键词： cryogenic channel laser target Pareto boundary

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Where is my forearm? Clustering of body parts from simultaneous tactile and linguistic input using sequential mapping

arXiv

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arXiv 2017年

作者： Štěpánová, Karla Hoffmann, Matěj Straka, Zdeněk Klein, Frederico B. Cangelosi, Angelo Vavrečka, Michal Center for Machine Perception Department of Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague Czech Institute of Informatics Robotics and Cybernetics Ctu in Prague ICub Facility Istituto Italiano di Tecnologia School of Computing Electronics and Mathematics Plymouth University Plymouth United Kingdom

Humans and animals are constantly exposed to a con-tinuous stream of sensory information from different modalities. At the same time, they form more com-pressed representations like concepts or symbols. In species that use language, this process is further struc-tured by this interaction, where a mapping between the sensorimotor concepts and linguistic elements needs to be established. There is evidence that children might be learning language by simply disambiguating potential meanings based on multiple exposures to utterances in different contexts (cross-situational learning). In ex-isting models, the mapping between modalities is usu-ally found in a single step by directly using frequencies of referent and meaning co-occurrences. In this paper, we present an extension of this one-step mapping and introduce a newly proposed sequential mapping algo-rithm together with a publicly available Matlab implementation. For demonstration, we have chosen a less typical scenario: instead of learning to associate ob-jects with their names, we focus on body representa-tions. A humanoid robot is receiving tactile stimula-tions on its body, while at the same time listening to utterances of the body part names (e.g., hand, forearm and torso). With the goal at arriving at the correct "body categories", we demonstrate how a sequential mapping algorithm outperforms one-step mapping. In addition, the effect of data set size and noise in the linguistic in-put are studied. Copyright © 2017, The Authors. All rights reserved.

关键词： Conformal mapping

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Comprehensive efficiency analysis of supercomputer resource usage based on system monitoring data

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Journal of Physics: Conference Series 2018年第1期973卷

作者： A A Mamaeva D I Shaykhislamov Vad V Voevodin S A Zhumatiy Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University 119991 Russia Moscow Leninskie gory 1 bld. 52 Research computing center Lomonosov Moscow State University 119234 Russia Moscow Leninskie gory 1 bld. 4

One of the main problems of modern supercomputers is the low efficiency of their usage, which leads to the significant idle time of computational resources, and, in turn, to the decrease in speed of scientific research. This paper presents three approaches to study the efficiency of supercomputer resource usage based on monitoring data analysis. The first approach performs an analysis of computing resource utilization statistics, which allows to identify different typical classes of programs, to explore the structure of the supercomputer job flow and to track overall trends in the supercomputer behavior. The second approach is aimed specifically at analyzing off-the-shelf software packages and libraries installed on the supercomputer, since efficiency of their usage is becoming an increasingly important factor for the efficient functioning of the entire supercomputer. Within the third approach, abnormal jobs – jobs with abnormally inefficient behavior that differs significantly from the standard behavior of the overall supercomputer job flow – are being detected. For each approach, the results obtained in practice in the Supercomputer Center of Moscow State University are demonstrated.

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