Результаты поиска по 'modeling':
Найдено статей: 757
  1. Antonov I.V., Bruttan I.V.
    Synthesis of the structure of organised systems as central problem of evolutionary cybernetics
    Computer Research and Modeling, 2023, v. 15, no. 5, pp. 1103-1124

    The article provides approaches to evolutionary modelling of synthesis of organised systems and analyses methodological problems of evolutionary computations of this kind. Based on the analysis of works on evolutionary cybernetics, evolutionary theory, systems theory and synergetics, we conclude that there are open problems in formalising the synthesis of organised systems and modelling their evolution. The article emphasises that the theoretical basis for the practice of evolutionary modelling is the principles of the modern synthetic theory of evolution. Our software project uses a virtual computing environment for machine synthesis of problem solving algorithms. In the process of modelling, we obtained the results on the basis of which we conclude that there are a number of conditions that fundamentally limit the applicability of genetic programming methods in the tasks of synthesis of functional structures. The main limitations are the need for the fitness function to track the step-by-step approach to the solution of the problem and the inapplicability of this approach to the problems of synthesis of hierarchically organised systems. We note that the results obtained in the practice of evolutionary modelling in general for the whole time of its existence, confirm the conclusion the possibilities of genetic programming are fundamentally limited in solving problems of synthesizing the structure of organized systems. As sources of fundamental difficulties for machine synthesis of system structures the article points out the absence of directions for gradient descent in structural synthesis and the absence of regularity of random appearance of new organised structures. The considered problems are relevant for the theory of biological evolution. The article substantiates the statement about the biological specificity of practically possible ways of synthesis of the structure of organised systems. As a theoretical interpretation of the discussed problem, we propose to consider the system-evolutionary concept of P.K.Anokhin. The process of synthesis of functional structures in this context is an adaptive response of organisms to external conditions based on their ability to integrative synthesis of memory, needs and information about current conditions. The results of actual studies are in favour of this interpretation. We note that the physical basis of biological integrativity may be related to the phenomena of non-locality and non-separability characteristic of quantum systems. The problems considered in this paper are closely related to the problem of creating strong artificial intelligence.

  2. Yashina M.V., Tatashev A.G.
    In memory of A. P.Buslaev — friend, scientist and founder of the scientific school of mathematical modeling of traffic flows
    Computer Research and Modeling, 2024, v. 16, no. 1, pp. 11-16
  3. Goguev M.V., Kislitsyn A.A.
    Modeling time series trajectories using the Liouville equation
    Computer Research and Modeling, 2024, v. 16, no. 3, pp. 585-598

    This paper presents algorithm for modeling set of trajectories of non-stationary time series, based on a numerical scheme for approximating the sample density of the distribution function in a problem with fixed ends, when the initial distribution for a given number of steps transforms into a certain final distribution, so that at each step the semigroup property of solving the Liouville equation is satisfied. The model makes it possible to numerically construct evolving densities of distribution functions during random switching of states of the system generating the original time series.

    The main problem is related to the fact that with the numerical implementation of the left-hand differential derivative in time, the solution becomes unstable, but such approach corresponds to the modeling of evolution. An integrative approach is used while choosing implicit stable schemes with “going into the future”, this does not match the semigroup property at each step. If, on the other hand, some real process is being modeled, in which goal-setting presumably takes place, then it is desirable to use schemes that generate a model of the transition process. Such model is used in the future in order to build a predictor of the disorder, which will allow you to determine exactly what state the process under study is going into, before the process really went into it. The model described in the article can be used as a tool for modeling real non-stationary time series.

    Steps of the modeling scheme are described further. Fragments corresponding to certain states are selected from a given time series, for example, trends with specified slope angles and variances. Reference distributions of states are compiled from these fragments. Then the empirical distributions of the duration of the system’s stay in the specified states and the duration of the transition time from state to state are determined. In accordance with these empirical distributions, a probabilistic model of the disorder is constructed and the corresponding trajectories of the time series are modeled.

  4. Borina M.Y., Polezhaev A.A.
    Diffusion instability in a threevariable reaction–diffusion model
    Computer Research and Modeling, 2011, v. 3, no. 2, pp. 135-146

    Investigation of occurrence of diffusion instability in a set of three reaction–diffusion equations is carried out. In the general case the condition for both Turing and wave instabilities are obtained. Qualitative properties of the system, in which the bifurcation of each of the two types can take place, are clarified. In numerical experiments it is shown that if the corresponding conditions are met in the nonlinear model, spatiotemporal patterns are formed, which are predicted by linear analysis.

    Views (last year): 1. Citations: 7 (RSCI).
  5. Yevin I.A., Koblyakov A.A., Savricov D.V., Shuvalov N.D.
    Cognitive Networks
    Computer Research and Modeling, 2011, v. 3, no. 3, pp. 231-239

    Traditional classification of real complex networks on biological, technological and social is incomplete, as there is a huge variety of artworks, which structure also can be presented in the form of networks. In this paper the review of researches of the complex networks, modeling some literary, musical and painting works is given. Corresponding networks are offered for naming cognitive networks. The possible directions of studying of such networks are discussed.

    Views (last year): 6. Citations: 16 (RSCI).
  6. Gorshenin A.K.
    On application of the asymptotic tests for estimating the number of mixture distribution components
    Computer Research and Modeling, 2012, v. 4, no. 1, pp. 45-53

    The paper demonstrates the efficiency of asymptotically most powerful test of statistical hypotheses about the number of mixture components in the adding and splitting component models. Test data are the samples from different finite normal mixtures. The results are compared for various significance levels and weights.

    Views (last year): 1. Citations: 2 (RSCI).
  7. Tikhov M.S., Borodina T.S.
    Mathematical model and computer analysis of tests for homogeneity of “dose–effect” dependence
    Computer Research and Modeling, 2012, v. 4, no. 2, pp. 267-273

    The given work is devoted to the comparison of two tests for homogeneity: chi-square test based on contingency tables of 2 × 2 and test for homogeneity based on asymptotic distributions of the summarized square error of a distribution function estimators in the model of ”dose–effect” dependence. The evaluation of test power is performed by means of computer simulation. In order to design efficiency functions the method of kernel regression estimator based on Nadaray–Watson estimator is used.

    Views (last year): 6.
  8. Vorontsov K.V., Potapenko A.A.
    Regularization, robustness and sparsity of probabilistic topic models
    Computer Research and Modeling, 2012, v. 4, no. 4, pp. 693-706

    We propose a generalized probabilistic topic model of text corpora which can incorporate heuristics of Bayesian regularization, sampling, frequent parameters update, and robustness in any combinations. Wellknown models PLSA, LDA, CVB0, SWB, and many others can be considered as special cases of the proposed broad family of models. We propose the robust PLSA model and show that it is more sparse and performs better that regularized models like LDA.

    Views (last year): 25. Citations: 12 (RSCI).
  9. Klimenko A.A., Ougolnitsky G.A.
    Subsystem “Developer” as a part of the Retail Payment System
    Computer Research and Modeling, 2013, v. 5, no. 1, pp. 25-36

    In this paper we consider one of the core subsystems of the retail payment system named “Developer”. The Queuing System for modeling this subsystem was developed and information about it is provided. The task for the assignment problem was set up and solved (the modification of the Hungarian algorithm was used). Information about Agent Based Model for subsystem “Developer” and the results of the simulation experiments are given.

  10. Zhуkharevуch V.V., Shumуlyak L.M., Strutinskaja L.T., Ostapov S.E.
    Construction and investigation of continuous cellular automatа model of heat conductivity processes with first order phase transitions
    Computer Research and Modeling, 2013, v. 5, no. 2, pp. 141-152

    The process of heat conduction, accompanied by the first order phase transitions is discussed in this article. Using cellular automates simulation was investigated class of problems that have broad application in practice. In this paper we calculate the temperature distribution in the depth of the soil at different times for a problem of freezing of moist soil. Another task — zone growing — has been modeled by cellular automates too. The coincidence of real and modeling parameters of the system confirms the feasibility of using the selected method of modeling of physical processes.

    Views (last year): 2. Citations: 2 (RSCI).
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