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2019 Ivannikov Ispras Open Conference, ISPRAS 2019

作者： Drobyshevskiy, Mikhail Aivazov, Denis Turdakov, Denis Yatskov, Alexander Varlamov, Maksim Shayhelislamov, Danil Ivannikov Institute for System Programming Russian Academy of Sciences Moscow Russia Moscow Institute of Physics and Technology State University Moscow Russia Lomonosov Moscow State University Moscow Russia

ISBN: (纸本)9781728160559

Online network crawling tasks require a lot of efforts for the researchers to collect the data. One of them is identification of important nodes, which has many applications starting from viral marketing to the prevention of disease spread. Various crawling algorithms has been suggested but their efficiency is not studied well. In this paper we compared six known crawlers on the task of collecting the fraction of the most influential nodes of graph. We analyzed crawlers behavior for four measures of node influence: node degree, k-coreness, betweenness centrality, and eccentricity. The experiments confirmed that greedy methods perform the best in many settings, but the cases exist when they are very inefficient. © 2019 IEEE.

关键词： Web crawler

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Numerical simulation of jet flows in homogeneous and heterogeneous media 16

Numerical simulation of jet flows in homogeneous and heterog...

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16th All-Russian Seminar with International Participation on Dynamics of Multiphase Media, DMM 2019

作者： Shevchenko, A.K. Strijhak, S.V. Yakovenko, S.N. Khristianovich Institute of Theoretical and Applied Mechanics Siberian Branch of Russian Academy of Sciences Novosibirsk630090 Russia Ivannikov Institute for System Programming Russian Academy of Sciences Moscow109004 Russia

Submerged jets at different Reynolds numbers (Re) with random perturbations added to the inlet velocity profile are simulated numerically by solving the Navier-Stokes equations. The effects of Re on flow behavior and the length of laminar jet region are studied. A natural gas jet flow emitting form the sea bottom is also simulated using the URANS and VOF methods, and forces acting on an object placed within the multiphase jet are evaluated. © 2019 IOP Publishing Ltd.

关键词： Navier Stokes equations

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Analysing the Impact of COVID-19 outbreak and Economic Policy Uncertainty on Stock Markets in Major Affected Economies 6

Analysing the Impact of COVID-19 outbreak and Economic Polic...

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6th Smart Cities Symposium, SCS 2022

作者： Matuka, Adelajda Asafo, Shuffield Seyram Eweke, Gamaliel O. Mishra, Pradeep Ray, Soumik Abotaleb, Mostafa Makarovskikh, Tatiana Alhussan, Amel Ali Abdelhamid, Abdelaziz A. El-Kenawy, El-Sayed M. Dutta, P.K. Chowdhury, Subrata University of Macerata Department of Economics and Law Italy Niger Delta University Department of Banking & Finance Nigeria J.N.K.V.V. College of Agriculture M.P. Powarkheda India Centurion University of Technology and Management Odisha Paralakhemundi India Department of System Programming South Ural State University Chelyabinsk454080 Russia Department of Computer Sciences College of Computer and Information Sciences Princess Nourah Bint Abdulrahman University Saudi Arabia Department of Computer Science Faculty of Computer and Information Sciences Ain Shams University Egypt Department of Communications and Electronics Delta Higher Institute of Engineering and Technolog Egypt School of Engineering and Technology Amity University West Bengal Kolkata India AP Chittoor India

ISBN: (纸本)9781839538544

The covid-19 pandemic and Economic Policy Uncertainty resulting from the shutdown of production, withdrawal of investments, enforcement of lockdowns and quarantines globally, have been directly affecting stock markets worldwide. This study is thus an attempt to analyse the impact of the COVID-19 pandemic on stock market behaviour in major affected economies. Moreover, the time frame was extended by using current data which investigate the impact of the virus during the boom and the blast phase in the country's most hit by the pandemic crisis such as China, Italy, UK and US. The frequency of the data is daily, and it dates from 3 January 2020 up to 10 February 2021. The considered time framework will give a deep insight into how stock markets behave in the case of an exogenous shock. The Dickey-Fuller Augmented Unit Root Test indicates that all the variables are stationary at first difference, which is one of the main conditions to have robust result, and the ARCH-LM test for the heteroskedasticity of the residuals, which show that all the probability values are significant, rejecting the null hypothesis of no ARCH effect. Based on the results of GARCH (1,1), we conclude that the change in stock markets volatility is positive and significant in China, Italy, UK and USA. This suggests that the impacts of COVID-19 outbreak and economic policy uncertainty on Stock Markets are a significant and Homogeneous across the studied countries, and the shock on FTSE Italia All Share has the longest time to vanish which makes it the riskiest to invest during this period, while the shock on SP500 USA has the shortest time to disappear meaning that it is safest Stock Market in this study. These findings have significant implications for policymakers, institutional and individual investors and Financial Markets analysts. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Investments

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Multi-windows rendering using software OpenGL in avionics embedded systems 29

Multi-windows rendering using software OpenGL in avionics em...

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29th International Conference on Computer Graphics and Vision, GraphiCon 2019

作者： Barladian, B.Kh. Shapiro, L.Z. Mallachiev, K.A. Khoroshilov, A.V. Solodelov, Y.A. Voloboy, A.G. Galaktionov, V.A. Koverninskiy, I.V. Keldysh Institute of Applied Mathematics Russian Academy of Sciences Moscow Russia FGUP «GosNIIAS» State Research Institute of Aviation Systems Moscow Russia Ivannikov Institute for System Programming Russian Academy of Sciences Moscow Russia

Elaboration of modern airplane cockpit has tendency to use large displays instead of a lot of separate indicators. The large display should combine information about flight navigation and state of plane equipment. Information coming from a wide variety of devices should be displayed simultaneously. Therefore multi-windows rendering is vitally important here. Its implementation must be embedded in real-time operating system which controls the aircraft. Development of a Safety Critical Compositor for multi-windows rendering for OpenGL SC 1.0.1 software is considered in the paper. It works under the real-time operating system JetOS newly designed for aircraft. Development is based on the use of extensions designed to work in multi-core systems in addition to standard JetOS partitioning services. Copyright © 2019 for this paper by its authors.

关键词： Embedded systems

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Synchronous composition of quasi-complete and quasi-deterministic FSMs

Synchronous composition of quasi-complete and quasi-determin...

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International Conference on Actual Problems of systems and Software Engineering

作者： Igor Burdonov Alexandr Kossachev Nina Yevtushenko Tiziano Villa Software Engineering department Ivannikov Institute for System Programming of RAS Software engineering deparment Ivannikov Institute for System Programming Computer Science Department University of Verona

ISBN: (纸本)9781728160627

In this paper, we consider the synchronous composition of Finite State Machines (FSMs) that corresponds to instantaneous communication of hardware components. Such FSMs can be deterministic or nondeterministic, partial or complete. We first extend the existing synchronous composition operator from a pair of components to a collection of components with multiple input and output ports, and provide a procedure to compute the composition working directly on the collection of transition tables of the component FSMs. Then, based on the notion of input-output Moore pair (the output is not sensitive to the input), we prove the following sufficient condition: if the composition has the property that every cycle of ports has a component with a Moore pair, then the class of quasi-complete and quasi-deterministic FSMs is closed under the proposed synchronous composition.

关键词： Finite state machine (FSM) Quasi-deterministic FSM Quasi-complete FSM Moore pair Synchronous composition Pairing multi-input output ports harbors finite state machines deterministic

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Application of the novel algorithm of vortex sheet intensity reconstruction to added masses estimation for complex-shaped bodies

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AIP Conference Proceedings 2023年第1期2849卷

作者： Ilia Marchevsky Georgy Shcheglov Bauman Moscow State Technical University Russia 105005 2-nd Baumanskaya st. 5. Moscow Russia Ivannokov institute for system programming of the RAS Russia 109004 Al.Solzhenitsyn st. 25 Moscow Russia

A novel algorithm of the Lagrangian vortex method is considered for incompressible flow simulation. The boundary condition on the body surface is satisfied by vortex sheet introduction, which intensity is determined from the equality between the tangential components of flow velocity limit value and the body surface velocity. High accuracy of velocity field reconstruction in the neighbourhood of the body surface permits to estimate unsteady aerodynamic loads for the complex-shaped bodies, including added masses tensor components with rather low computational cost.

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Homomorphic Comparison Methods: Technologies, Challenges, and Opportunities

Homomorphic Comparison Methods: Technologies, Challenges, an...

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Engineering and Telecommunication (En&T), International Conference

作者： Mikhail Babenko Andrei Tchernykh Elena Golimblevskaia Luis Bernardo Pulido-Gaytan Arutyun Avetisyan Ivannikov Institute for System Programming Moscow Russia South Ural State University Chelyabinsk Russia North-Caucasus Federal University Stavropol Russia CICESE Research Center Ensenada Mexico

ISBN: (纸本)9781728188300

The use of cloud computing imposes a number of restrictions related to the security and confidentiality of stored and processed data. One of the mechanisms that allows expanding the scope of public cloud services for processing personal and medical data is homomorphic encryption. Homomorphic encryption allows performing arithmetic addition and multiplication operations on encrypted data. To expand the scope of homomorphic encryption, efficient algorithms are needed to implement the operation of comparing encrypted numbers. In this paper we investigate existing algorithms of encrypted numbers comparison for homomorphic encryption schemes operating both with integers and with fixed-precision numbers. We have shown that for homomorphic integer ciphers, there are efficient algorithms for comparing encrypted numbers based on Lagrange interpolation of a function of two variables. We have shown that fixed-precision comparison of encrypted numbers is an open problem.

关键词： Deep learning Interpolation Cloud computing Ciphers Neural networks Iterative algorithms Encryption

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Evaluation of the Impact of Various Local Data Caching Configurations on Tier2/Tier3 WLCG Sites 4

Evaluation of the Impact of Various Local Data Caching Confi...

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4th International Workshop on Data Life Cycle in Physics, DLC 2020

作者： Alekseev, Aleksandr Jezequel, Stephane Kiryanov, Andrey Klimentov, Alexei Korchuganova, Tatiana Mitsyn, Valery Oleynik, Danila Smirnov, Serge Zarochentsev, Andrey Nrc ÂKurchatov Instituteâ A- Pnpi Gatchina Russia Saint Petersburg State University Saint Petersburg Russia Brookhaven National Laboratory UptonNY United States Joint Institute for Nuclear Research Dubna Russia National Research Nuclear University MEPhI Moscow Russia Institute for System Programming Ras Moscow Russia University Andres Bello Santiago Chile Plekhanov University of Economy Moscow Russia Laboratoire DâAnnecy de Physique des Particules Annecy France

In this paper, we describe various data caching scenarios test implementation and lessons learned. In particular, we show how local data caches may be configured, deployed, and tested. In our studies, we are using xCache, which is a special type of Xrootd server setup to cache input data for a physics analysis. A relatively large Tier2 storage is used as a primary data source and several geographically distributed smaller WLCG sites configured specifically for this test. All sites are connected to the LHCONE network. The testbed configuration is evaluated using both synthetic tests and real ATLAS computational jobs submitted via the HammerCloud toolkit. The impact and realistic applicability of different local cache configurations is explained, including both the network infrastructure and the configuration of computing nodes. © 2020 CEUR-WS. All rights reserved.

关键词： High energy physics

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Optimal Routing for Autonomous Taxis using Distributed Reinforcement Learning 18

Optimal Routing for Autonomous Taxis using Distributed Reinf...

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18th IEEE International Conference on Data Mining Workshops (ICDMW)

作者： Rahili, Salar Riviere, Benjamin Oliver, Suzanne Chung, Soon-Jo Ivannikov Institute for System Programming of Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9781538692882

In this paper, a learning-based optimal transportation algorithm for autonomous taxis and ridesharing vehicles is introduced. The goal is to design a mechanism to solve the routing problem for a fleet of autonomous vehicles in real-time in order to maximize the transportation company's profit. To solve this problem, the system is modeled as a Markov Decision Process (MDP) using past customers data. By solving the defined MDP, a centralized high-level planning recommendation is obtained, where this offline solution is used as an initial value for the real-time learning. Then, a distributed SARSA reinforcement learning algorithm is proposed to capture the model errors and the environment changes, such as variations in customer distributions in each area, traffic, and fares, thereby providing an accurate model and optimal policies in real-time. Agents are using only their local information and interaction, such as current passenger requests and estimates of neighbors' tasks and their optimal actions, to obtain the optimal policies in a distributed fashion. The agents use the estimated values of each action, provided by distributed SARSA reinforcement learning, in a distributed game-theory based task assignment to select their conflict-free customers. Finally, the customers data provided by the city of Chicago is used to validate the proposed algorithms.

关键词： Reinforcement learning Transportation Routing Planning Task analysis Real-time systems Urban areas

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Numerical simulation of the interaction between suspended sediment and moving plate based on the drift-flux model

Numerical simulation of the interaction between suspended se...

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Ivannikov ISPRAS Open Conference (ISPRAS)

作者： Bo Yang Qin Zhang Bingchen Liang Xin Liu Mengxiang Qu Kraposhin Matvey Erwan Bertevas College of Engineering Ocean University of China Qingdao China Ivannikov Institute for System Programming of the RAS Moscow Russia Keppel-NUS Corporate Laboratory National University of Singapore France

ISBN: (数字)9781665412919

ISBN: (纸本)9781665448215

In recent years, the research on deep-sea mining has become more and more popular, especially in the interaction between the harvesting system and seabed to estimate and minimize seabed disturbance. In this paper, an inclined plane is adopted to simplify the front of the nodule harvester, and a solver for simulating turbulent sediment transport and fluid-structure interaction is developed based on the drift-flux model in the OpenFOAM. The volume of fluid (VOF) algorithm is used to simulate the diffusion and sedimentation process of sediment in the water, and the kOmegaSST model is used to calculate the turbulent diffusion coefficient of the mixed solution. Two different dynamic mesh strategies, overset and arbitrarily coupled mesh interface (ACMI) methods, are used to simulate the movement of the tilting push plate. This paper compares the simulation results of two different strategies. The results show that under the same simulation accuracy, ACMI method is more reliable and efficient than overset method.

关键词： Solid modeling Simulation Numerical simulation Numerical models Sediments Reliability Optimization

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