Cloud storages delivered as services are made available to the general public. As cloud storage provider prices become low, they have moved into the mainstream of storage technology. However, there are various factors...
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ISBN:
(数字)9781728144849
ISBN:
(纸本)9781728144856
Cloud storages delivered as services are made available to the general public. As cloud storage provider prices become low, they have moved into the mainstream of storage technology. However, there are various factors that cause many potential users do not use it intensively. There exist high risks for confidentiality, integrity, and availability violation associated with the loss of information, denial of access, technical failures, etc. In this article, we propose a two-level secret sharing scheme (TL-SSS) based on a residue number system (RNS) for a configurable, reliable, and secure distributed data storage. RNS moduli of a special type increase the reliability of the data storage system and reduce the computational complexity of the data encoding and decoding from linear-logarithmic to linear. TL-SSS is the weighted data access structure. It creates and distributes data shares according to the characteristics of the cloud storages under various scenarios. We provide a solution that improves system reliability without reduction of the security level. In contrast to classical solutions, it can restore the data with less available shares than the state-of-the-art approaches.
The paper deals with the issue of language data visualization on the website "Minority languages of Russia". This site is created as an open information resource containing materials on the functioning and s...
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The general theory of greedy approximation with respect to arbitrary dictionaries is well developed in the case of real Banach spaces. Recently, some of results proved for the Weak Chebyshev Greedy Algorithm (WCGA) in...
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The study of icing processes on elements of an airplane, helicopter, UAV, wind turbines, and power line wires is an urgent task in connection with flight safety and reliable operation of ground equipment. The features...
The study of icing processes on elements of an airplane, helicopter, UAV, wind turbines, and power line wires is an urgent task in connection with flight safety and reliable operation of ground equipment. The features of the numerical simulation of multicomponent reactive mixture flow using the iceFoam solver were considered. The Euler-Lagrangian approach was used to describe the behavior of the two-phase flow with air and liquid droplets. The specifics of the construction of the project on the basis of the computation of the liquid film model for the conditions of the experimental setup for the 2D cylinder and NACA0012 airfoil are discussed. The results of computations of the main parameters of the ice accretion process are given, the efficiency of the iceFoam solver for parallel simulation on two different grids was shown. The computations were run on the high-performance cluster UNIHUB of ISP RAS.
Networks of human interactions (like social and mobile call networks) in most cases inherit natural properties of society, e.g. community structure or tie strength. The method for generating large random mobile call g...
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Networks of human interactions (like social and mobile call networks) in most cases inherit natural properties of society, e.g. community structure or tie strength. The method for generating large random mobile call graphs is introduced. Generated graphs reflect real network properties, such as community structure or Double Pareto Log-Normal degree distribution. Generation time is linear in the number of edges. The proposed method is intended to facilitate evaluation of algorithms designed for mobile call network analysis.
Features of numerical simulation of multicomponent reactive mixture flows using the OpenFOAM package reactingCentralFoam solver are considered. The specifics of the construction of the project on the basis of the calc...
Features of numerical simulation of multicomponent reactive mixture flows using the OpenFOAM package reactingCentralFoam solver are considered. The specifics of the construction of the project on the basis of the calculation of the combustion of the oxygen-hydrogen mixture for the conditions of the experimental setup “Penn State Pre-burner Combustor” are discussed. The results of computations of the main parameters of the combustion process are given, the efficiency of the applied solver is shown.
As a necessary preliminary step toward geophysically significant extrapolations, we study the scale effects in internal wave attractors in the linear and nonlinear regimes. We use two geometrically similar experimenta...
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The wind energy is an important part of renewable energy. The wind farms can operate in various climatic conditions on a large territory of Russian Federation. The features of numerical simulation of turbulent flows u...
The wind energy is an important part of renewable energy. The wind farms can operate in various climatic conditions on a large territory of Russian Federation. The features of numerical simulation of turbulent flows using the OpenFOAM package and SOWFA library are considered. The mathematical model has the equations for mass, momentum and energy conservation for incompressible flow. Large-eddy simulation has been applied in the context of wind turbines operation. Lagrangian-averaged scale-independent dynamic Smagorinsky model is used. Two solvers ABLSolver and pisoFoamTurbine have been used for simulations. The results of computations for two test cases (2 and 12 wind turbines) with definition of the main flow parameters are given, the efficiency of the applied solver is shown.
Various models of solubility of gas in two-phase ows of gas and liquid are considered. Such phenomena play an important role in various technical devices especially at modern nuclear power plants. Mathematical models ...
Various models of solubility of gas in two-phase ows of gas and liquid are considered. Such phenomena play an important role in various technical devices especially at modern nuclear power plants. Mathematical models of bubble ows with gas dissolution, gas phase model, and model of liquid phase dissolution were considered and discussed.
The paper discusses the capabilities of the iceFoam solver for modeling the ice accretion processes for various swept wing profiles and 3D swept wing. The Euler-Lagrangian approach is used to describe the gas-droplet ...
The paper discusses the capabilities of the iceFoam solver for modeling the ice accretion processes for various swept wing profiles and 3D swept wing. The Euler-Lagrangian approach is used to describe the gas-droplet medium. To determine the shape of ice, the model of a liquid film according to the shallow water theory is used. Three different version of solver iceFoam are discussed. The features of the solver algorithm for parallel computations are explained. The numerical cases with swept wing were run for “Rime Ice” and “Glaze Ice”. The distribution of ice thickness and temperature were defined for swept wing with GLC-305 airfoil using iceDyMFoam3. The calculation results are compared with the data of experiments by M. Papadakis. The computations were run on the high-performance cluster UNIHUB of ISP RAS, HPC Kurchatov institute.
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