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Supercomputing Frontiers and Innovations 2018年第4期5卷 67-72页

作者： Trifanov, Petr V. Kaneva, Valeriia N. Strijhak, Sergei V. Panteleev, Mikhail A. Ataullakhanov, Fazoil I. Dunster, Joanne Voevodin, Vadim V. Nechipurenko, Dmitry Y. Department of Physics Lomonosov Moscow State University Moscow Russia Dmitry Rogachev National Research Center of Pediatric Hematology Oncology and Immunology Moscow Russia Center for Theoretical Problems of Physicochemical Pharmacology Moscow Russia Ivannikov Institute for System Programming of the RAS Moscow Russia Faculty of Biological and Medical Physics Moscow Institute of Physics and Technology Dolgoprudny Russia Institute for Cardiovascular and Metabolic Research School of Biological Sciences University of Reading Berkshire United Kingdom Research Computing Center of Lomonosov Moscow State University Moscow Russia

Formation of the platelet plug represents a primary response to the vessel wall injury, but may also result in vessel occlusion. The decrease of the local blood flow due to platelet thrombus formation may lead to serious complications, such as ischemic stroke and myocardial infarction. However, mechanisms responsible for regulation of thrombus dynamics are not clear. In order to get a deeper insight into the role of blood flow and platelet interactions in the formation of the primary platelet plug we developed a particle-based model of microvascular thrombosis using quasisteady flow approximation. In order to simulate thrombus dynamics at physiologically relevant timescales of several minutes, we took advantage of the supercomputer technologies. Our in silico analysis revealed the importance of platelet size heterogeneity for describing experimental data on microvascular thrombus formation. Thus, our model represents a useful tool for the supercomputeraided computational analysis of thrombus dynamics in the microvessels on physiologically relevant timescales. © The Author 2018.

关键词： Platelets

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Simulation of viscoelastic flow past circular airfoil by using the modified LS-STAG immersed boundary method

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Journal of Physics: Conference Series 2019年第1期1348卷

作者： Valeria V Puzikova Applied Mathematics Department Bauman Moscow State Technical University 2-ya Baumanskaya st. 5 str. 1 Moscow 105005 Russian Federation Compiler Technology Department Ivannikov Institute for System Programming of the RAS Alexander Solzhenitsyn st. 25 Moscow 109004 Russian Federation

The LS-STAG immersed boundary cut-cell method modification for viscoelastic flow computations is presented. Rate type viscoelastic flow models (linear and quasilinear) are considered. Rate type viscoelastic flow models (linear and quasilinear) are considered. The obtained numerical method is implemented in the LS-STAG software package developed by the author. This software allows to simulate viscous incompressible flows by using the LS-STAG method and it modifications. The LS-STAG-discretization of extra-stress equations for viscoelastic Maxwell, Jeffreys, upper-convected Maxwell, Maxwell-A, Oldroyd-B, Oldroyd-A, Johnson Segalman fluids was developed. Formulae for differential types of convected time derivatives (Oldroyd, Cotter — Rivlin, Jaumann — Zaremba — Noll derivatives) the LS-STAG discretization was obtained. Normal non-newtonian stresses are computed at the centers of base LS-STAG mesh cells and shear non-newtonian stresses are computed at the cell corners. Time-stepping algorithm is based on the first order predictor-corrector scheme. To validate developed numerical method the test problem about viscoelastic Oldroyd-B flow past a circular airfoil was used. Computational experiments were carried out at Weissenberg number in the range from 0 to 4. The computed values of the drag coefficients and the wake length are in good agreement with the experimental data.

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Preface

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CEUR Workshop Proceedings 2019年 2514卷 1-2页

作者： Avetisyan, Arutyun Ivar, Jacobson Pozin, Boris A. Petrenko, Alexander K. Pozin, Boris A. Petrenko, Alexander K. Cavalli, Ana Rosa Petrenko, Alexander K. Avetisyan, Arutyun Arlazarov, Vladimir Avdoshin, Sergey Batovrin, Victor K. Bershadsky, Alexander M. Boichenko, Alexander Juris, Borzovs Vasenin, Valery A. Schlingloff, Holger Kalyanov, Georgy Kantorovich, Georgy G. Korolev, Anton Kosolapov, Mikhail S. Kostogryzov, Andrey I. Koznov, Dmitry V. Kuznetsov, Sergey Prokhorov, Sergei Soyfer, Victor A. Starykh, Vladimir A. Stolyarov, Gennady K. Stupnikov, Sergey A. Telnov, Yury Ph. Shmid, Alexander Mira, Kajko-Mattssen Miroslawa Wentzl, Wilfried Mayer, Walter H. Yevtushenko, Nina Zakharov, Victor Zmeev, Oleg Cavalli, Ana Rosa Petrenko, Alexander K. Pozin, Boris A. RAS ISP Russia Ivar Jacobson International Switzerland NRU HSE «-leasing» Co Russia NRU HSE ISP RAS Russia Information and Analytical Systems «-leasing» Co Russia Department of Network Software TELECOM and Management SudParis France NRU HSE Russia Software Engineering of Ivannikov Institute for System Programming RAS Russia RAS System Analysis Institute of Federal Research Centre Informatics and Management Russia Russia Penza State University Russia Federal State Educational Centre of Higher Learning «Plekhanov Russian University of Economics» Russia CISA Academy of Sciences of Latvia State University of Latvia Latvia MSU Institut für Offene Kommunikationssysteme FOKUS Germany Verifikation und Testtheorie an der Humboldt-Universität zu Berlin Germany Institute of Control Sciences RAS Russia Institute of Sociology RAS NRU HSE Russia ISO IEEC Institute of Informatics Problems Federal Research Centre IM RAS Russia St. Petersburg State University Russia Institute for System Programming RAS Moscow State University Russia SRI Korolev Samara State Aerospace University Russia Belarus FRC IM RAS Russia FSEC «Plekhanov Russian University of Economics» Russia KTH School of Information and Communication Technology Sweden Governmental Agricultural Analyst Austria Austria Ivannikov Institute for System Programming RAS Russia Institute of Informatics Problems Federal Research Centre IM RAS Russia Tomsk State University Russia

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Dynamic Diluted Taint Analysis for Evaluating Detected Policy Violations

Dynamic Diluted Taint Analysis for Evaluating Detected Polic...

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Ivannikov ISPRAS Open Conference (ISPRAS)

作者： Maksim Bakulin Maria Klimushenkova Danila Egorov Ivannikov Institute for System Programming of the RAS The Yaroslav-the-Wise Novgorod State University. Faculty of Computational Mathematics and Cybernetics Moscow State University

Dynamic taint analysis is a well-known technique. This article describes some difficulties that have to be dealt with when using dynamic taint analysis with full-system emulation. A new method is proposed to evaluate the risk of a detected policy violation. The method is called Diluted Taint: each tainted byte has an assigned integer value that shows how much taint resides in this byte. High value represents fresh taint, that possesses more threat, low value means that many operations occurred with this fragment of data and it is not that dangerous. When a policy violation occurs, these values are used by an expert to quickly evaluate the potential threat and prioritize fixing dangerous ones first.

关键词： Engines Security Instruments Registers Electronic mail Microsoft Windows

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Numerical simulation in 2D strongly coupled FSI problems for incompressible flows by using vortex method

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AIP Conference Proceedings 2018年第1期2027卷

作者： Kseniia Kuzmina Ilia Marchevsky Evgeniya Ryatina 1Bauman Moscow State Technical University Russia 2Ivannikov Institute for System Programming of the Russian Academy of Sciences Russia

Two coupling strategies for numerical simulation in Fluid-Structure Interaction problems using vortex methods are considered and implemented in new open-source code VM2D developed by the authors for 2D incompressible flows simulations around airfoils using vortex methods. The first strategy called “partitioned approach” implies that hydrodynamical subproblem and mechanical one are solved separately, step-by-step. However, this method has limited range of applicability. In the second strategy called “monolithic approach” these two subproblems are solved together. Both approaches are implemented in the VM2D code and their comparison is carried out for the model problem of a circular cylinder wind resonance (transversal oscillations) simultation.

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MayAnd at SemEval-2016 task 5: Syntactic and word2vec-based approach to aspect-based polarity detection in Russian 10

MayAnd at SemEval-2016 task 5: Syntactic and word2vec-based ...

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10th International Workshop on Semantic Evaluation, SemEval 2016

作者： Mayorov, Vladimir Andrianov, Ivan Institute for System Programming Russian Academy of Sciences 25 Alexander Solzhenitsyn Street Moscow Russia

ISBN: (纸本)9781941643952

This paper describes aspect-based polarity detection system for Russian, used in aspectbased sentiment analysis task (ABSA) of SemEval-2016 (Task 5, subtask 1, slot 3). The system consists of two independent classifiers: for opinion target expressions and for implicit opinion target mentions. We introduce a set of standard unigram features together with more sophisticated ones: based on sentence syntactic structure and based on lemmas vector representation. Being applied to Russian restaurant reviews, our system achieved best quality among four participants. © 2016 Association for Computational Linguistics.

关键词： Syntactics

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Implementation of POD and DMD methods in Apache Spark framework for simulation of unsteady turbulent flow in the model combustor 7

Implementation of POD and DMD methods in Apache Spark framew...

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7th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS Congress 2016

作者： Kalugin, Michael D. Strijhak, Sergei V. Institute for System Programming Russian Academy of Sciences Alexander Solzhenitsyn st. 25 Moscow109004 Russia

ISBN: (纸本)9786188284401

The paper is devoted to modelling and analysis of unsteady turbulent flow in a model combustor (channel) using LES (Large Eddy Simulation). Simulations were provided for 2D and 3D cases on different grids of a flow in a channel with rearward facing step. The calculation of a flow in a channel was performed on high performance cluster, using the new approach in Apache Spark framework and POD, DMD data processing algorithms. First 4 dynamic modes were defined.

关键词： Dynamic mode decomposition

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Numerical simulation of compressible gas flows using regularized gas dynamic equations solver QGDFoam

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AIP Conference Proceedings 2018年第1期2027卷

作者： M. V. Kraposhin T. G. Elizarova M. A. Istomina D. A. Ryazanov K. A. Vatutin 1Ivannikov Institute for System Programming of RAS Moscow Russia 2Keldysh Institute of Applied Mathematics of RAS Moscow Russia 3Lomonosov Moscow State University Moscow Russia

The work presents results of the application of a new OpenFOAM® solver QGDFoam for the numerical simulation of viscous compressible flows in a wide range of Mach numbers. The new solver is based on the explicit approximation of regularized, or quasi-gas dynamic (QGD) equations. The mixed finite-volume and finite-difference approximation is constructed on unstructured spatial grids with co-located variables storage. The solver has been tested for a number of 1D Riemann problems (Sod’s problem, Noh test and others) and 2D cases (Mach 3 forward step, Ladenburg supersonic jet flow with Mach reflection, NASA Langley supersonic overexpanded jet flow and subsonic laminar flow over a backward-facing step). Results of numerical simulations were compared with analytic solutions and OpenFOAM® implementation of the Kurganov-Tadmor scheme, known as rhoCentralFoam. The testing procedure has shown that whereas QGD algorithm is more diffusive than Godunov-type methods with 2nd order TVD schemes with limiters, it is far less diffusive compared with pure upwind schemes as HLL. It was shown that OpenFOAM implementation of the QGD algorithm allows to compute successfully subsonic, sonic and supersonic flows, while other OpenFOAM® solvers have a very limited operational Mach number range. Preliminary results of QGDFoam application for large-scale 3D problems are presented. Scaling tests for up to 768 cores showed good scalability of QGDFoam solver.

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Simulation of transonic low-Reynolds jets using quasi-gas dynamics equations

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Journal of Physics: Conference Series 2019年第1期1382卷

作者： M V Kraposhin A S Epikhin T G Elizarova K A Vatutin Ivannikov Institute for System Programming of the RAS Russia Moscow Solzhenitsyna str. 25 The Department of Aeromechanics and Flight Engineering Moscow Institute of Physics and Technology Russia Moscow Region Jukovskiy Gagarin str. 16 Keldysh Institute of Applied Mathematics of the RAS Russia Moscow Miusskaya Sqr. 4 Bauman Moscow State Technical University Russia Moscow 2nd Baumanskay str. 5 building 1 Faculty of Mechanics and Mathematics Lomonosov Moscow State University Russia Moscow GSP-1 Leninskiye gory 1

In this paper application of the OpenFOAM solver QGDFoam for numerical simulation of transonic viscous flows is considered. The developed solver, which implements regularized or quasi- gas dynamics (QGD) algorithms, is validated using the transonic low-Re jet flow case (Ma=0.9, Re=3600). The conducted numerical simulations allow the assessing applicability of the solver for modelling hydrodynamic instabilities and their interaction with transonic flow. Results of the numerical simulations are compared with experimental observations and Navier-Stokes-based code simulation. Results of the present study formulate a guideline for choosing (values of) QGD-algorithm tuning parameters.

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Reproducing Network Structure: A Comparative Study of Random Graph Generators

Reproducing Network Structure: A Comparative Study of Random...

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Ivannikov ISPRAS Open Conference (ISPRAS)

作者： Mikhail Drobyshevskiy Denis Turdakov Sergey Kuznetsov Moscow Institute of Physics and Technology (State University) Moscow Russia Russian Academy of Sciences Ivannikov Institute for System Programming Moscow Russia National Research University Higher School of Economics Moscow Russia Lomonosov Moscow State University Moscow Russia

The problem of generating graphs similar to a given one arises in such tasks as data anonymization and significance testing of network mining tools. Main challenges lie in a rich diversity of graph domains emerging in various research areas and the uncertainty about graph properties to be reproduced. Our central statement is that a good graph generation model should follow two requirements on generated graphs: 1) similarity to the original one in terms of manifold graph metrics, and 2) variability wide enough to mimic natural diversity across a graph domain. In this work we have compared three state-of-the-art graph generators, Embedding based Random Graph Generator, Gscaler, and Stochastic Kronecker Graph, universal enough to fit an arbitrary graph. We found that ERGG and Gscaler greatly outperform SKG in graph reproducing accuracy in terms of graph metrics. An experiment with domain imitation showed that the variability of ERGG generated graphs resembled the original variability, while Gscaler graphs were almost identical.

关键词： Measurement Adaptation models Social network services Computational modeling Generators Task analysis Testing

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