Most viewed papers

541. Breev A.I., Shapovalov A.V.
     Vacuum polarization of scalar field on Lie groups with Bi-invariant metric
     Computer Research and Modeling, 2015, v. 7, no. 5, pp. 989-999

     We consider vacuum polarization of a scalar field on the Lie groups with a bi-invariant metric of Robertson-Walker type. Using the method of orbits we found expression for the vacuum expectation values of the energy-momentum tensor of the scalar field which are determined by the representation character of the group. It is shown that Einstein’s equations with the energy-momentum tensor are consistent. As an example, we consider isotropic Bianchi type IX model.

     Keywords: vacuum polarization, orbit method.
     Views (last year): 2.
542. Petrosyan A.Sh.
     The New Use of Network Element in ATLAS Workload Management System
     Computer Research and Modeling, 2015, v. 7, no. 6, pp. 1343-1349

     A crucial component of distributed computing systems is network infrastructure. While networking forms the backbone of such systems, it is often the invisible partner to storage and computing resources. We propose to integrate Network Elements directly into distributed systems through the workload management layer. There are many reasons for this approach. As the complexity and demand for distributed systems grow, it is important to use existing infrastructure efficiently. For example, one could use network performance measurements in the decision making mechanisms of workload management systems. New advanced technologies allow one to programmatically define network configuration, for example SDN — Software Defined Networks. We will describe how these methods are being used within the PanDA workload management system of the ATLAS collaboration.

     Keywords: ATLAS, PanDA, distributed computing, workload management system, decision making mechanisms, network, network performance measurements, software defined networks.
     Views (last year): 2. Citations: 2 (RSCI).
543. Perepelkin E.E., Nyanina L.A., Polyakova R.V., Sysoev P.N., Panacik V.A., Yudin I.P.
     Construction of adaptive mesh in the domain with boundary «corner point» of ferromagnetic in the numerical simulation of magnetic systems
     Computer Research and Modeling, 2016, v. 8, no. 1, pp. 89-99

     At numerical solving of the boundary-value problem of magnetostatic in a domain with a boundary corner point, a question of accuracy of the obtained solution near the corner point of ferromagnetic arises [Zhidkov, Perepelkin, 2001]. Near the corner point an essential growth of the module of the magnetic field can take place, which leads to the necessity of constructing special numerical algorithms when solving the boundary-value problem. This work represents an algorithm of constructing an adaptive mesh in the domain with a boundary corner point of ferromagnetic taking into account the character of behaviour of the solution of the boundary-value problem. An example of calculating a model problem in the domain containing a corner point is given.

     Keywords: magnet systems, mathematical modeling, boundary value problem, elliptic equations, the behavior of solutions in the corner domain.
     Views (last year): 2.
544. Tsviashchenko E.V.
     Adequacy analysis the model of strong replicas agreement in NoSQL databases
     Computer Research and Modeling, 2016, v. 8, no. 1, pp. 101-112

     In this article the model of strong replicas agreement was analyzed. The process of preparing and conducting the nature experiment in the cloud in order to proof the model adequacy was described. Specifications of the program for implementation of database access to the NoSQL system and the program for handling journals were presented. One part of obtained experiments results was used for model adaptation, another part — for adequacy evaluating. The adequacy analysis is presented.

     Keywords: NOSQL database, strong consistency, adequacy, adaptation, waiting time, Laplas–Stilties transform.
     Views (last year): 2.
545. Nemchinova A.V.
     Marks of stochastic determinacy of forest ecosystem autogenous succession in Markov models
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 255-265

     This article describes a method to model the course of forest ecosystem succession to the climax state by means of a Markov chain. In contrast to traditional methods of forest succession modelling based on changes of vegetation types, several variants of the vertical structure of communities formed by late-successional tree species are taken as the transition states of the model. Durations of succession courses from any stage are not set in absolute time units, but calculated as the average number of steps before reaching the climax in a unified time scale. The regularities of succession courses are revealed in the proper time of forest ecosystems shaping. The evidences are obtained that internal features of the spatial and population structure do stochastically determine the course and the pace of forest succession. The property of developing vegetation of forest communities is defined as an attribute of stochastic determinism in the course of autogenous succession.

     Keywords: modeling course of succession, Markov chain, pace of forest succession, vertical structure of forest communities, stochastic determinism, proper time of forest ecosystem shaping.
     Views (last year): 2. Citations: 2 (RSCI).
546. Zubkova E.V., Zhukova L.A., Frolov P.V., Shanin V.N.
     A.S. Komarov’s publications about cellular automata modelling of the population-ontogenetic development in plants: a review
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 285-295

     The possibilities of cellular automata simulation applied to herbs and dwarf shrubs are described. Basicprinciples of discrete description of the ontogenesis of plants on which the mathematical modeling based are presents. The review discusses the main research results obtained with the use of models that revealing the patterns of functioning of populations and communities. The CAMPUS model and the results of computer experiment to study the growth of two clones of lingonberry with different geometry of the shoots are described. The paper is dedicated to the works of the founder of the direction of prof. A. S. Komarov. A list of his major publications on this subject is given.

     Keywords: computer models, individual-based approach.
     Views (last year): 2. Citations: 6 (RSCI).
547. Belotelov N.V., Konovalenko I.A.
     Modeling the impact of mobility of individuals on space-time dynamics of a population by means of a computer model
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 297-305

     A computer model describing the spatial-temporal dynamics of populations of interacting with renewable resource is proposed. The life cycle of the individual is described. The algorithm for spatial mobility of individuals within an area is proposed, which takes into account nutritional and social activity. The paper presents the computational experiments with the model that mimic the movement of herds of animals in the area, and describes the model experiment when the group type of animal behavior due to changes in the characteristics of the environment and animal behavior the herd animals is formed, which later goes again in the group type of animal behavior.

     Keywords: a computer model, cellular automata, spatio-temporal dynamics.
     Views (last year): 2. Citations: 3 (RSCI).
548. Priputina I.V., Frolova G.G., Shanin V.N.
     Substantiation of optimum planting schemes for forest plantations: a computer experiment
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 333-343

     The article presents the results of computer simulations aimed to assess the influence of tree spatial locations (planting schemes) on the productivity and the dynamics of soil fertility in forest plantations. The growth of aspen (Populus tremula L.) in plantations with short rotation (30 years) was simulated in the EFIMOD system of models with the soil and climatic data matching forested lands in the Mari El Republic. The outcome reveals that higher biomass rates, increase in soil organic matter stocks, and the minimal loss of soil nitrogen can be obtained when the distance between trees in the row equals 1–4 m and 4–6 м in aisles.

     Keywords: computer simulation, ecosystem dynamics, spatial structure, forest plantations, planting scheme, biomass production, soil fertility.
     Views (last year): 2. Citations: 2 (RSCI).
549. Chertov O.G., Nadporozhskaya M.A.
     Models of soil organic matter dynamics: problems and perspectives
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 391-399

     Soil as a complex multifunctional open system is one of the most difficult object for modeling. In spite of serious achievements in the soil system modeling, existed models do not reflect all aspects and processes of soil organic matter mineralization and humification. The problems and “hot spots” in the modeling of the dynamics of soil organic matter and biophylous elements were identified on a base of creation and wide implementation of ROMUL and EFIMOD models. The following aspects are discussed: further theoretical background; improving the structure of models; preparation and uncertainty of the initial data; inclusion of all soil biota (microorganisms, micro- and meso-fauna) as factors of humification; impact of soil mineralogy on C and N dynamics; hydro-thermal regime and organic matter distribution in whole soil profile; vertical and horizontal migration of soil organic matter. An effective feedback from modellers to experimentalists is necessary to solve the listed problems.

     Keywords: mathematic model, soil organic matter.
     Views (last year): 2. Citations: 3 (RSCI).
550. Arkhangelskaya T.A., Khokhlova O.S., Miakshina T.N.
     Mathematical modeling of soil hydrology in two arable Chernozems with different depth to carbonates
     Computer Research and Modeling, 2016, v. 8, no. 2, pp. 401-410

     Simulation of soil hydrology was performed for two plots: the first one was under corn monocrop and another one was under bare fallow for 50 years. The depth to carbonates is 140–160 cm under corn and 70–80 cm under bare fallow. Mathematical modeling with the HYDRUS-1D software and the FAO56 method demonstrated that soil hydrology was different for the two plots. Soil moisture was generally higher under bare fallow than under corn. The upward fluxes were significantly greater under bare fallow than under corn, and they were obtained for a thicker soil layer.

     Keywords: arable chernozems, soil hydrology, HYDRUS-1D.
     Views (last year): 2. Citations: 1 (RSCI).

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