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arXiv 2018年

作者： Volkov, Grigoriy Mandrykin, Mikhail Efremov, Denis Faculty of Computer Science National Research University Higher School of Economics Moscow Russia Software Engineering Department Ivannikov Institute for System Programming Russian Academy of Sciences Moscow Russia

This paper describes the development of an auto-active verification technique in the Frama-C framework. We outline the lemma functions method and present the corresponding ACSL extension, its implementation in Frama-C, and evaluation on a set of string-manipulating functions from the Linux kernel. We illustrate the benefits our approach can bring concerning the effort required to prove lemmas, compared to the approach based on interactive provers such as Coq. Current limitations of the method and its implementation are discussed. Copyright © 2018, The Authors. All rights reserved.

关键词： Formal verification

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Numerical Study on the Asymmetry in Wake Steering of Wind Turbine under Yawed Conditions 32nd

Numerical Study on the Asymmetry in Wake Steering of Wind Tu...

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32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Wei, Dezhi Wang, Nina Wan, Decheng Strijhak, Sergei School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai China Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Huadong Engineering Corporation Limited Hangzhou China Ivannikov Institute for System Programming of the Russian Academy of Sciences Moscow Russia

ISBN: (纸本)9781880653814

Wake redirection via active yaw control is a promising strategy to improve the whole wind farm performance. To successfully apply such an operational control in the real-world engineering, it is necessary to have a precise knowledge of the yawed turbines and their wakes. In the current work, a series of numerical simulations are performed by the high-fidelity SOWFA tool, to study the occurring asymmetry in oppositely signed yaw angles, as well as its effects on wake-steering performance. The simulation results demonstrate that the wake curl is asymmetric between positive and negative yaw angles, arising from the interaction of the counter-rotating vortices with the vertical wind veer. Some key wake properties are also observed to be asymmetric with respect to the yaw angle direction, especially the lateral wake deflection, which can affect the efficiency of active yaw control. What's more, a load study of wake steering is conducted, showing that the positive yaw offsets are less harmful to the tested NREL 5MW wind turbine. In conclude, this work emphasizes the necessity and importance of considering the yaw direction in implementing yaw-based wind farm control. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Wakes

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Runtime Verification of Linux Kernel Modules Based on Call Interception

Runtime Verification of Linux Kernel Modules Based on Call I...

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International Conference on software Testing, Verification, and Validation, ICST

作者： Vladimir V. Rubanov Eugene A. Shatokhin Department of Software Engineering Institute of System Programming of the Russian Academy of Sciences Moscow Russia

Verification of Linux kernel modules and especially device drivers is a critically important task. However, due to the special nature of the kernel operation, it is very challenging to perform runtime analysis of particular kernel modules of interest without adverse influence on the rest of the kernel. Methods and tools for addressing this challenge are the main subject of this paper. The basic method for low-influence runtime analysis of interacting software modules is call interception. Shadow state techniques represent another method. In this paper, we discuss these methods including three different approaches to implement call interception. Conclusions are made about the most suitable ways for runtime analysis of kernel modules. Finally, we present KEDR framework, an extensible runtime analysis system for Linux kernel modules, which deploys these approaches to perform different types of analysis. The system can be used by the developers of kernel modules and, in particular, may be useful for building automated driver verification systems.

关键词： Kernel Driver circuits Instruments Linux Runtime Binary codes Resource management

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Reconfigurable Model-Based Test Program Generator for Microprocessors

Reconfigurable Model-Based Test Program Generator for Microp...

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IEEE International Conference on software Testing Verification and Validation Workshop, ICSTW

作者： Alexander Kamkin Eugene Kornykhin Dmitry Vorobyev Software Engineering Department Institute for System Programming Russian Academy of Sciences Moscow Russia

Automatic generation and simulation of test programs is known to be the main means for verifying microprocessors. The problem is that test program generators for new designs are often developed from scratch with little reuse of well-tried components. State-of-the-art tools, like Genesys-Pro and RAVEN, meet the challenge by using a model-based approach, where a microprocessor model is separated from a platform-independent generation core. However, there is still a problem. Developing a microprocessor model is rather difficult and usually requires deep knowledge of the inner-core structure and interfaces. In this paper, we describe a concept of a reconfigurable test program generator being customized with the help of architecture specifications and configuration files, which describe parameters of the microprocessor subsystems (pipeline, memory, and others). The suggested approach eases the model development and makes it possible to apply the model-based testing in the early design stages when the microprocessor architecture is frequently modified.

关键词： Microprocessors Generators Automatic programming Microarchitecture Registers Pipelines Computer architecture

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Coverage-directed verification of microprocessor units based on cycle-accurate contract specifications

Coverage-directed verification of microprocessor units based...

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East-West Design & Test Symposium (EWDTS)

作者： Alexander Kamkin Software Engineering Department Institute for System Programming of Russian Academy of Sciences Moscow Russia

In this paper we describe a method for simulation-based verification of microprocessor units based on cycle-accurate contract specifications. Such specifications describe behavior of a unit in the form of preconditions and postconditions of microoperations. Test sequence generation is based on traversal of FSM constructed automatically from specifications and test coverage definition. We have successfully applied the method to several units of the industrial MIPS64-compatible microprocessor.

关键词： Microprocessors Contracts Automation Program processors Computer architecture Algorithm design and analysis Computational modeling

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Ontological Approach to the Formal Specification of the Standard Life Cycle

Ontological Approach to the Formal Specification of the Stan...

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Science and Information Conference

作者： Ekaterina Lavrishcheva Software Engineering Department Institute for System Programming of the RAS Prof. MIPT Moscow Russia

ISBN: (纸本)9781479985487

Approach is offered to the formal specification of Standard Life Cycle (LC) of the program systems (PS) by the ontology facilities with purpose automation and generation of the variants LC for making the appropriate kinds process for development different PS. Ontological approach to presentation LC model of the standard ISO/IEC 12207-2007 is included the specification of general, organizational and support processes. These processes are presented in the subject-oriented DSL, which than transformed to XML for realization. One of the processes, the testing process is given in terms of Protégé systems. An eventual result of this system Protégé got generally at accepted to the XML, suitable for implementation tasks testing PS on computer.

关键词： ontology the life cycle standard model of life cycle processes actions task testing DSL description Protégé XML

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Comparative analysis of non/ductedpropeller under the influence of vertical wall

Comparative analysis of non/ductedpropeller under the influe...

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ivannikov ISPRAS Open Conference (ISPRAS)

作者： Mengfei Wang QingXu Qin Zhang Andrey Epikhin Bingchen Liang College of Engineering Ocean University of China Qingdao China Ivannikov Institute for System Programming of the RAS Moscow Russia Shandong Provincial Key Laboratory of Ocean Engineering Qingdao China

A numerical and experimental study has been conducted to explore the influence of vertical wall on the wake of the non/ducted propeller. The numerical simulation is achieved using a structured and transient sliding mesh approach. The control equations are closed by the Delayed Detached Eddy Simulation (DDES), and the computational results are compared with the available experimental data. By dividing the ducted propeller flow wake vortex shape into different behavior regions, the temporal vortex evolution near the wake of the propellers under the influence of different vertical walls are emphatically analysed. The results show that the jet flow wake reaches the wall, forming a conical low-speed area at the centre of the wall. The fluid circulates from the outer side to the inner side of the cone, forming a vortex whose size first increases and then decreases with the distance between the propellers and the wall. In addition, the change of propellers wake velocity profile is given. The wake velocity of propeller and ducted propeller decreases exponentially and linearly along the flow direction, respectively.

关键词： Fluids Propellers Shape Computational modeling Numerical simulation Mathematical models Data models

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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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Assessment of Turbulent Wake Behind two Wind Turbines Using Multi-Fractal Analysis

Assessment of Turbulent Wake Behind two Wind Turbines Using ...

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ivannikov ISPRAS Open Conference (ISPRAS)

作者： Arina Kryuchkova Jackson Tellez-Alvarez Sergei Strijhak Jose M. Redondo Russian Academy of Sciences Ivannikov Institute for System Programming of the Russian Academy of Sciences Moscow Russia Department of Civil and Environmental Engineering Technical University of Catalonia BarcelonaTech Barcelona Spain Department of Physics Technical University of Catalonia BarcelonaTech Barcleona Spain

In this paper we present preliminary results of the multi-fractal analysis for describing the behavior of turbulence evolution in the wake behind two model wind turbines using the program ImaCal. The wind energy is an important component of renewable energy sources. Nowadays the research community focuses on studying the turbulent wakes behind wind turbines and its interactions with the Atmospheric Boundary Layer. For finding the fractal dimension a multi-fractal analysis was performed using the results of a numerical simulation of the flow over two model wind turbines. The latter was carried out by means of the Large Eddy method with the Lagrangian Dynamic Smagorinsky subgrid model. The SOWFA library was employed as a part of OpenFoam software to perform the simulation.

关键词： Wind turbines Blades Mathematical model Computational modeling Atmospheric modeling software Poles and towers

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Using Machine Learning Techniques for Assessing Media Text Readability

Using Machine Learning Techniques for Assessing Media Text R...

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Annual Siberian Russian Workshop on Electron Devices and Materials (EDM)

作者： Andrey Laputenko Tatiana Evtushenko Elena Klochkova Nina Yevtushenko Department of Information Technologies National Research Tomsk State University Tomsk Russian Federation Graduate School of Applied Linguistics and Translation Studies Peter the Great St. Petersburg Polytechnic University Saint Petersburg Russian Federation Department of Software Engineering Ivannikov Institute for System Programming of the Russian Academy of Sciences Moscow Russian Federation

The paper addresses the problem of assessing media text readability depending on the correlation of objective and subjective text complexity. Objective text complexity refers to a set of measurable characteristics such as baseline, morphological, syntactic and lexical characteristics of a media text (a piece of news published on university websites), which is calculated automatically for each text. In total, 34 parameters are considered. Subjective text complexity score is assigned to each text by human experts who assess the clarity, structure, cohesion and coherence of the text. The correlation between subjective and objective text complexity is studied using machine learning models. The readability level is measured using machine learning methods and regression-correlation analysis. Namely, an artificial neural network and regression models are used. It is demonstrated that the use of polynomial features and lasso regularization allows to get a compact regression model of a high quality. The use of the chosen machine learning techniques made it possible to estimate the impact of distinct linguistic features on the readability level.

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