Most cited papers (RSCI)

371. Kolobov A.V., Kuznetsov M.B.
     Mathematical modeling of low invasive tumor growth with account of inactivation of vascular endothelial growth factor by antiangiogenic drug
     Computer Research and Modeling, 2015, v. 7, no. 2, pp. 361-374

     A mathematical model of tumor growth in tissue taking into account angiogenesis and antiangiogenic therapy is developed. In the model the convective flows in tissue are considered as well as individual motility of tumor cells. It is considered that a cell starts to migrate if the nutrient concentration falls lower than the critical level and returns into proliferation in the region with high nutrient concentration. Malignant cells in the state of metabolic stress produce vascular endothelial growth factor (VEGF), stimulating tumor angiogenesis, which increases the nutrient supply. In this work an antiangiogenic drug which bounds irreversibly to VEGF, converting it to inactive form, is modeled. Numerical analysis of influence of antiangiogenic drug concentration and efficiency on tumor rate of growth and structure is performed. It is shown that antiangiogenic therapy can decrease the growth of low-invasive tumor, but is not able to stop it completely.

     Keywords: mathematical modeling, tumor, VEGF, antiangiogenic therapy.
     Views (last year): 4. Citations: 1 (RSCI).
372. Iakushkin O.O., Grishkin V.M.
     Visualization of work of a distributed application based on the mqcloud library
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 529-532

     Independent components communicating with each other due to complex control make the work of complex distributed computer systems poorly scalable within the framework of the existing communication middleware. Two major problems of such systems' scaling can be defined: overloading of unequal nodes due to proportional redistribution of workload and difficulties in the realization of continuous communication between several nodes of the system. This paper is focused on the developed solution enabling visualization of the work of such a dynamical system.

     Keywords: distributed systems, cloud computing, services, monitoring, networking, peer-to-peer.
     Citations: 1 (RSCI).
373. Minkin A.S., Knizhnik A.A., Potapkin B.V.
     OpenCL realization of some many-body potentials
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 549-558

     Modeling of carbon nanostructures by means of classical molecular dynamics requires a lot of computations. One of the ways to improve the performance of basic algorithms is to transform them for running on SIMD-type computing systems such as systems with dedicated GPU. In this work we describe the development of algorithms for computation of many-body interaction based on Tersoff and embedded-atom potentials by means of OpenCL technology. OpenCL standard provides universality and portability of the algorithms and can be successfully used for development of the software for heterogeneous computing systems. The performance of algorithms is evaluated on CPU and GPU hardware platforms. It is shown that concurrent memory writes is effective for Tersoff bond order potential. The same approach for embedded-atom potential is shown to be slower than algorithm without concurrent memory access. Performance evaluation shows a significant GPU acceleration of energy-force evaluation algorithms for many-body potentials in comparison to the corresponding serial implementations.

     Keywords: GPGPU, OpenCL, many-body potentials, Tersoff potential, embedded-atom potential, atomic operations.
     Views (last year): 4. Citations: 1 (RSCI).
374. Yuzhanin N.V., Tipikin Yu.A., Gankevich I.G., Zolotarev V.I.
     Computational task tracking complex in the scientific project informational support system
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 615-620

     This work describes the idea of the system of informational support for the scientific projects and the development of computational task tracking complex. Due to large requirements for computational experiments the problem of presentation of the information about HPC tasks becomes one of the most important. Nonstandard usage of the service desk system as a basis of the computational task tracking and support system can be the solution of this problem. Particular attention is paid to the analysis and the satisfaction of the conflicting requirements to the task tracking complex from the different user groups. Besides the web service kit used for the integration of the task tracking complex and the datacenter environment is considered. This service kit became the main interconnect between the parts of the scientific project support system and also this kit allows to reconfigure the whole system quickly and safely.

     Keywords: service desk, task tracking, HPC, web service.
     Views (last year): 2. Citations: 1 (RSCI).
375. Bogdanov A.V., Degtyreva Ya.A., Zakharchuk E.A., Tikhonova N.A., Foux V.R., Khramushin V.N.
     Interactive graphical toolkit global computer simulations in marine service operational forecasts
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 641-648

     Efficiency and completeness of the numerical simulation in oceanography and hydrometeorology are entirely determined by algorithmic features of the construction of an interactive computer simulations in the scale of the oceans with adaptive coated closed seas and coastal waters refined mathematical models, with the possibility of specifying software parallelization calculations near the concrete — the protected areas of the sea coast. An important component of the research is continuous graphical visualization techniques in the course of calculations, including those undertaken in parallel processes with shared RAM or test points on the external media. The results of computational experiments are used in the description of hydrodynamic processes near the coast, which is important in keeping the organization of sea control services and forecasting marine hazards.

     Keywords: computational simulation, interactive graphics systems, engineering systems, oceanography, hydrometeorology, tensor mathematics.
     Citations: 1 (RSCI).
376. Bondyakov A.S.
     Basic directions of information technology in National Academy of Sciences of Azerbaijan
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 657-660

     Grid is a new type of computing infrastructure, is intensively developed in today world of information technologies. Grid provides global integration of information and computing resources. The essence Conception of GRID in Azerbaijan is to create a set of standardized services to provide a reliable, compatible, inexpensive and secure access to geographically distributed high-tech information and computing resources a separate computer, cluster and supercomputing centers, information storage, networks, scientific tools etc.

     Keywords: grid infrastructure, information technology, grid segment, cloud infrastructure.
     Views (last year): 6. Citations: 1 (RSCI).
377. Shefov K.S., Stepanova M.M.
     An implementation of a parallel global minimum search algorithm with an application to the ReaxFF molecular dynamic force field parameters optimization
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 745-752

     Molecular dynamic methods that use ReaxFF force field allow one to obtain sufficiently good results in simulating large multicomponent chemically reactive systems. Here is represented an algorithm of searching optimal parameters of molecular-dynamic force field ReaxFF for arbitrary chemical systems and its implementation. The method is based on the multidimensional technique of global minimum search suggested by R.G. Strongin. It has good scalability useful for running on distributed parallel computers.

     Keywords: numerical simulation, molecular dynamics, reactive force field, chemically reactive systems, parameter optimization, parallel algorithm, absolute extremum search.
     Views (last year): 1. Citations: 1 (RSCI).
378. Bogdanov A.V., Mareev V.V., Stepanov E.A., Panchenko M.V.
     Modeling of behavior of the option. The formulation of the problem
     Computer Research and Modeling, 2015, v. 7, no. 3, pp. 759-766

     Object of research: The creation of algorithm for mass computations of options‘ price for formation of a riskless portfolio. The method is based on the generalization of the Black–Scholes method. The task is the modeling of behavior of all options and tools for their insurance. This task is characterized by large volume of realtime complex computations that should be executed concurrently The problem of the research: depending on conditions approaches to the solution should be various. There are three methods which can be used with different conditions: the finite difference method, the path-integral approach and methods which work in conditions of trade stop. Distributed computating in these three cases is organized differently and it is necessary to involve various approaches. In addition to complexity the mathematical formulation of the problem in literature is not quite correct. There is no complete description of boundary and initial conditions and also several hypotheses of the model do not correspond to real market. It is necessary to give mathematically correct formulation of the task, and to neutralize a difference between hypotheses of the model and their prototypes in the market. For this purpose it is necessary to expand standard formulation by additional methods and develop methods of realization for each of solution branches.

     Keywords: financial mathematics, options pricing, asian option, wellposedness formulation, boundary conditions.
     Views (last year): 2. Citations: 1 (RSCI).
379. Petrov I.B., Muratov M.V., Favorskaya A.V., Biryukov V.A., Sannikov A.V.
     Numerical modeling of straight 3D exploration seismology problems with use of grid-characteristic method on unstructured tetrahedral meshes
     Computer Research and Modeling, 2015, v. 7, no. 4, pp. 875-887

     The article contains results of 3D modeling of seismic responses from fractured geological formations with use of grid-characteristic method on unstructured tetrahedral meshes with use of high-performance computation systems. The method being used is the most suitable for modeling of heterogenic domains exploration seismology problems. The use of unstructured tetrahedral meshes allows modeling of different geometry and space orientation fractures. That gives us possibility to solve the problems in the most real set.

     Keywords: numerical modeling, grid-characteristic method, unstructured tetrahedral meshes, high-performance computations, exploration seismology, fractured media.
     Views (last year): 7. Citations: 1 (RSCI).
380. Konstantinov D.V., Bzowski K., Korchunov A.G., Pietrzyk M.
     Modeling of axisymmetric deformation processes with taking into account the metal microstructure
     Computer Research and Modeling, 2015, v. 7, no. 4, pp. 897-908

     The article describes the state of the art computer simulation in the field of metal forming processes, the main problem points of traditional methods were identified. The method, that allows to predict the deformation distribution in the volume of deformable metal with taking into account of microstructure behavioral characteristics in deformation load conditions, was described. The method for optimizing computational resources of multiscale models by using statistical similar representative volume elements (SSRVE) was presented. The modeling methods were tested on the process of single pass drawing of round rod from steel grade 20. In a comparative analysis of macro and micro levels models differences in quantitative terms of the stress-strain state and their local distribution have been identified. Microlevel model also allowed to detect the compressive stresses and strains, which were absent at the macro level model. Applying the SSRVE concept repeatedly lowered the calculation time of the model while maintaining the overall accuracy.

     Keywords: multiscale modeling, drawing, Statistically Similar Representative Volume Element, microstructure, stress-strain state.
     Views (last year): 9. Citations: 1 (RSCI).

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