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Introduction to the theory of complex networks
Computer Research and Modeling, 2010, v. 2, no. 2, pp. 121-141Views (last year): 53. Citations: 107 (RSCI).There was a new direction of studying of the complex systems last years, considering them as networks. Nodes in such networks represent elements of these complex systems, and links between nodes – interactions between elements. These researches deal with real systems, such as biological (metabolic networks of cells, functional networks of a brain, ecological systems), technical (the Internet, WWW, networks of the companies of cellular communication, power grids), social (networks of scientific cooperation, a network of movie actors, a network of acquaintances). It has appeared that these networks have more complex architecture, than classical random networks. In the offered review the basic concepts theory of complex networks are given, and the basic directions of studying of real networks structures are also briefly described.
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Grid-cloud services simulation for NICA project, as a mean of the efficiency increasing of their development
Computer Research and Modeling, 2014, v. 6, no. 5, pp. 635-642Views (last year): 4. Citations: 3 (RSCI).A new grid and cloud services simulation for NICA accelerator complex data storage and processing system are described. This system is focused on improving the efficiency of the grid-cloud systems development by using work quality indicators of some real system to design and predict its evolution. For these purpose the simulation program are combined with real monitoring system of the grid-cloud service through a special database. An example of the program usage to simulate a sufficiently general cloud structure, which can be used for more common purposes, is given.
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RDMS CMS computing: current status and plans
Computer Research and Modeling, 2015, v. 7, no. 3, pp. 395-398Views (last year): 2.The Compact Muon Solenoid (CMS) is a high-performance general-purpose detector at the Large Hadron Collider (LHC) at CERN. More than twenty institutes from Russia and Joint Institute for Nuclear Research (JINR) are involved in Russia and Dubna Member States (RDMS) CMS Collaboration. A proper computing grid-infrastructure has been constructed at the RDMS institutes for the participation in the running phase of the CMS experiment. Current status of RDMS CMS computing and plans of its development to the next LHC start in 2015 are presented.
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Scientific and pedagogical schools founded by A. S. Kholodov
Computer Research and Modeling, 2018, v. 10, no. 5, pp. 561-579Views (last year): 42.In the science development an important role the scientific schools are played. This schools are the associations of researchers connected by the common problem, the ideas and the methods used for problems solution. Usually Scientific schools are formed around the leader and the uniting idea.
The several sciences schools were created around academician A. S. Kholodov during his scientific and pedagogical activity.
This review tries to present the main scientific directions in which the bright science collectives with the common frames of reference and approaches to researches were created. In the review this common base is marked out. First, this is development of the group of numerical methods for hyperbolic type systems of partial derivatives differential equations solution — grid and characteristic methods. Secondly, the description of different numerical methods in the undetermined coefficients spaces. This approach developed for all types of partial equations and for ordinary differential equations.
On the basis of A. S. Kholodov’s numerical approaches the research teams working in different subject domains are formed. The fields of interests are including mathematical modeling of the plasma dynamics, deformable solid body dynamics, some problems of biology, biophysics, medical physics and biomechanics. The new field of interest includes solving problem on graphs (such as processes of the electric power transportation, modeling of the traffic flows on a road network etc).
There is the attempt in the present review analyzed the activity of scientific schools from the moment of their origin so far, to trace the connection of A. S. Kholodov’s works with his colleagues and followers works. The complete overview of all the scientific schools created around A. S. Kholodov is impossible due to the huge amount and a variety of the scientific results.
The attempt to connect scientific schools activity with the advent of scientific and educational school in Moscow Institute of Physics and Technology also becomes.
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Investigation of approximation order of invariant differential operators on movable irregular quadrangular grid
Computer Research and Modeling, 2011, v. 3, no. 4, pp. 353-364Views (last year): 2.The a priori analysis of approximation of magnetohydrodynamic equations on irregular quadrangular analysis was performed. The values of coefficients wich determine the misalignment norm for difference analogs of operators gradient and divergence were calculated. Was studied the influence of properties of grid cells on misalignment. For the numerical confirmation of obtained estimations were cited the examples of calculations with specifying identical initial data on different grids.
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Modeling bypass transition within $k-\varepsilon$ approach
Computer Research and Modeling, 2014, v. 6, no. 6, pp. 879-888Views (last year): 11. Citations: 8 (RSCI).This article is dedicated to investigation of the possibility to predict bypass transition by means of an unsophisticated low-Reynolds $k-\varepsilon$ turbulence model. Such a model has been developed at TESIS Ltd. The model is implemented in the FlowVision software suit. The ideas implemented in the model are discussed in the article. The capability of the model to predict bypass transition is demonstrated on well-known test cases T3B, T3A, T3A-.
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The implicit line-by-line recurrence method in application to the solution of problems of incompressible viscous fluid dynamics
Computer Research and Modeling, 2015, v. 7, no. 1, pp. 35-50Views (last year): 3. Citations: 3 (RSCI).In the paper the results of applying the implicit line-by-line recurrence method for solving of systems of elliptic difference equations, arising, in particular, at numerical simulation of dynamics of incompressible viscous fluid are considered. Research is conducted on the example of the problem about a steady-state two-dimensional lid-driven cavity flow formulated in primitive variables ($u,\, v,\, p$) for large Re (up to 20 000) and grids (up to 2049×2049). High efficiency of the method at calculation of a pressure correction fields is demonstrated. The difficulties of constructing a solution of the problem for large Rе are analyzed.
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Grid based high performance computing in satellite imagery. Case study — Perona–Malik filter
Computer Research and Modeling, 2015, v. 7, no. 3, pp. 399-406Views (last year): 3.The present paper discusses an approach to the efficient satellite image processing which involves two steps. The first step assumes the distribution of the steadily increasing volume of satellite collected data through a Grid infrastructure. The second step assumes the acceleration of the solution of the individual tasks related to image processing by implementing execution codes which make heavy use of spatial and temporal parallelism. An instance of such execution code is the image processing by means of the iterative Perona–Malik filter within FPGA application specific hardware architecture.
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Statistical analysis of Margolus’s block-rotating mechanism cellular automation modeling the diffusion in a medium with discrete singularities
Computer Research and Modeling, 2015, v. 7, no. 6, pp. 1155-1175Views (last year): 8. Citations: 4 (RSCI).The generalization of Margolus’s block cellular automaton on a hexagonal grid is formulated. Statistical analysis of the results of probabilistic cellular automation for vast variety of this scheme solving the test task of diffusion is done. It is shown that the choice of the hexagon blocks is 25% more efficient than Y-blocks. It is shown that the algorithms have polynomial complexity, and the polynom degree lies within 0.6÷0.8 for parallel computer, and in the range 1.5÷1.7 for serial computer. The effects of embedded into automaton’s field defective cells on the rate of convergence are studied also.
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International Interdisciplinary Conference "Mathematics. Computing. Education"