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    Wyświetlanie 1-5 z 5
    Tytuł:
    EGIPSYS: An enhanced gene expression programming approach for symbolic refression problems
    Autorzy:
    Lopes, H. S.
    Weinert, W. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/907638.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    obliczanie ewolucyjne
    regresja symboliczna
    modelowanie matematyczne
    evolutionary computation
    symbolic regression
    mathematical modelling
    systems identification
    Opis:
    This paper reports a system based on the recently proposed evolutionary paradigm of gene expression programming (GEP). This enhanced system, called EGIPSYS, has features specially suited to deal with symbolic regression problems. Amongst the new features implemented in EGIPSYS are: new selection methods, chromosomes of variable length, a new approach to manipulating constants, new genetic operators and an adaptable fitness function. All the proposed improvements were tested separately, and proved to be advantageous over the basic GEP. EGIPSYS was also applied to four difficult identification problems and its performance was compared with a traditional implementation of genetic programming (LilGP). Overall, EGIPSYS was able to obtain consistently better results than the system using genetic programming, finding less complex solutions with less computational effort. The success obtained suggests the adaptation and extension of the system to other classes of problems.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 375-384
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Algorithmic Aspects of Subspace Identification With Inputs
    Autorzy:
    Chiuso, A.
    Picci, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/908319.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    podprzestrzeń
    układ wielowymiarowy
    subspace identification
    multivariable systems
    identification with inputs
    ill-conditioning
    Opis:
    It has been experimentally verified that most commonly used subspace methods for identification of linear state-space systems with exogenous inputs may, in certain experimental conditions, run into ill-conditioning and lead to ambiguous results. An analysis of the critical situations has lead us to propose a new algorithmic structure which could be used either to test difficult cases and/or to implement a suitable combination of new and old algorithms presented in the literature to help fixing the problem.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 55-75
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Range Identification for a Perspective Dynamic System with a Single Homogeneous Observation
    Autorzy:
    Ma, L.
    Chen, Y.
    Moore, K. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/908492.pdf
    Data publikacji:
    2005
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system identyfikacji
    układ dynamiczny
    obserwator nieliniowy
    range identification
    perspective dynamic systems
    nonlinear observer
    Opis:
    Perspective problems arise in machine vision when using a camera to observe the scene. Essential problems include the identification of unknown states and/or unknown parameters from perspective observations. Range identification is used to estimate the states/positions of a moving object with known motion parameters. Range estimation has been discussed in the literature using nonlinear observers with full homogeneous observations derived from the image plane. In this paper, the same range identification problem is discussed with a single homogeneous observation using nonlinear observers. Our simulation results verify the convergence of the observers when their observability conditions are satisfied.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2005, 15, 1; 63-72
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of parameter constraints in EE and OE methods for optimal identification of continuous LTI models
    Autorzy:
    Byrski, W.
    Byrski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331405.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system ciągły
    funkcja przenoszenia
    metoda najmniejszych kwadratów
    continuous systems
    parameter constraints in identification
    modulating functions
    transfer function normalization
    least squares method
    Opis:
    The paper presents two methods used for the identification of Continuous-time Linear Time Invariant (CLTI) systems. In both methods the idea of using modulating functions and a convolution filter is exploited. It enables the proper transformation of a differential equation to an algebraic equation with the same parameters. Possible different normalizations of the model are strictly connected with different parameter constraints which have to be assumed for the nontrivial solution of the optimal identification problem. Different parameter constraints result in different quality of identification. A thorough discussion on the role of parameter constraints in the optimality of system identification is included. For time continuous systems, the Equation Error Method (EEM) is compared with the continuous version of the Output Error Method (OEM), which appears as a special sub-case of the EEM.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 379-388
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of physically motivated constraints for efficient interval simulations applied to the analysis of uncertain dynamical systems
    Autorzy:
    Freihold, M.
    Hofer, E. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/930126.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    system Hamiltona
    algorytm rozgałęzienia
    system dynamiczny
    VALENCIA-IVP
    consistency tests for the reduction of overestimation
    identification of dynamical constraints
    Hamiltonian systems
    branch algorithm
    prune algorithm
    Opis:
    Interval arithmetic techniques such as VALENCIA-IVP allow calculating guaranteed enclosures of all reachable states of continuous-time dynamical systems with bounded uncertainties of both initial conditions and system parameters. Considering the fact that, in naive implementations of interval algorithms, overestimation might lead to unnecessarily conservative results, suitable consistency tests are essential to obtain the tightest possible enclosures. In this contribution, a general framework for the use of constraints based on physically motivated conservation properties is presented. The use of these constraints in verified simulations of dynamical systems provides a computationally efficient procedure which restricts the state enclosures to regions that are physically eaningful. A branch and prune algorithm is modified to a consistency test, which is based on these constraints. Two application scenarios are studied in detail. First, the total energy is employed as a conservation property for the analysis of mechanical systems. It is shown that conservation properties, such as the energy, are applicable to any Hamiltonian system. The second scenario is based on constraints that are derived from decoupling properties, which are considered for a high-dimensional compartment model of granulopoiesis in human blood cell dynamics.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 485-499
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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