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    Wyświetlanie 1-6 z 6
    Tytuł:
    A mixed integer nonlinear programming formulation for the problem of fitting positive exponential sums to empirical data
    Autorzy:
    Alvarez, A.
    Lara, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/254845.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    mixed integer nonlinear programming
    regularization
    nonlinear least squares
    Opis:
    In this work we deal with exponential sum models coming from data acquisition in the empirical sciences. We present a two step approach based on Tikhonov regularization and combinatorial optimization, to obtain stable parameter estimations, which fit the data. We develop properties of the solutions, based on their optimality conditions. Some numerical experiments are shown to illustrate our approach.
    Źródło:
    Opuscula Mathematica; 2011, 31, 4; 481-499
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An inverse backward problem for degenerate two-dimensional parabolic equation
    Autorzy:
    Atifi, Khalid
    Essoufi, El-Hassan
    Khouiti, Bouchra
    Powiązania:
    https://bibliotekanauki.pl/articles/255085.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    data assimilation
    adjoint method
    regularization
    heat equation
    inverse problem
    degenerate equations
    optimization
    Opis:
    This paper deals with the determination of an initial condition in the degenerate two-dimensional parabolic equation [formula], where Ω is an open, bounded subset of R2, a [formula] with a ≥0 everywhere, and [formula], with initial and boundary conditions [formula] from final observations. This inverse problem is formulated as a minimization problem using the output least squares approach with the Tikhonov regularization. To show the convergence of the descent method, we prove the Lipschitz continuity of the gradient of the Tikhonov functional. Also we present some numerical experiments to show the performance and stability of the proposed approach.
    Źródło:
    Opuscula Mathematica; 2020, 40, 4; 427-449
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On some inverse problem for bi-parabolic equation with observed data in L$\text{}^{p}$ spaces
    Autorzy:
    Tuan, Nguyen Huy
    Powiązania:
    https://bibliotekanauki.pl/articles/2048891.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    biparabolic equation
    Fourier truncation method
    inverse source parabolic
    inverse initial problem
    regularization
    Sobolev embeddings
    Opis:
    The bi-parabolic equation has many practical significance in the field of heat transfer. The objective of the paper is to provide a regularized problem for bi-parabolic equation when the observed data are obtained in $L^{p}$. We are interested in looking at three types of inverse problems. Regularization results in the L$\text{}^{2}$ space appears in many related papers, but the survey results are rare in $L^{p}$, p≠2. The first problem related to the inverse source problem when the source function has split form. For this problem, we introduce the error between the Fourier regularized solution and the exact solution in $L^{p}$ spaces. For the inverse initial problem for both linear and nonlinear cases, we applied the Fourier series truncation method. Under the terminal input data observed in $L^{p}$, we obtain the approximated solution also in the space $L^{p}$. Under some reasonable smoothness assumptions of the exact solution, the error between the the regularized solution and the exact solution are derived in the space $L^{p}$. This paper seems to generalize to previous results for bi-parabolic equation on this direction.
    Źródło:
    Opuscula Mathematica; 2022, 42, 2; 305-335
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution of the boundary value problem of heat conduction in a cone
    Autorzy:
    Ramazanov, Murat
    Jenaliyev, Muvasharkhan
    Gulmanov, Nurtay
    Powiązania:
    https://bibliotekanauki.pl/articles/2048719.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    non-cylindrical domain
    cone
    boundary value problem of heat conduction
    singular Volterra integral equation
    Carleman–Vekua regularization method
    Opis:
    In the paper we consider the boundary value problem of heat conduction in a non-cylindrical domain, which is an inverted cone, i.e. in the domain degenerating into a point at the initial moment of time. In this case, the boundary conditions contain a derivative with respect to the time variable; in practice, problems of this kind arise in the presence of the condition of the concentrated heat capacity. We prove a theorem on the solvability of a boundary value problem in weighted spaces of essentially bounded functions. The issues of solvability of the singular Volterra integral equation of the second kind, to which the original problem is reduced, are studied. We use the Carleman–Vekua method of equivalent regularization to solve the obtained singular Volterra integral equation.
    Źródło:
    Opuscula Mathematica; 2022, 42, 1; 75-91
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convolutions, integral transforms and integral equations by means of the theory of reproducing kernels
    Autorzy:
    Castro, L. P.
    Saitoh, S.
    Tuan, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/256011.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Hilbert space
    linear transform
    reproducing kernel
    linear mapping
    convolution
    norm inequality
    integral equation
    Tikhonov regularization
    Opis:
    This paper introduces a general concept of convolutions by means of the theory of reproducing kernels which turns out to be useful for several concrete examples and applications. Consequent properties are exposed (including, in particular, associated norm inequalities).
    Źródło:
    Opuscula Mathematica; 2012, 32, 4; 633-646
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uniformly continuous composition operators in the space of bounded Φ-variation functions in the Schramm sense
    Autorzy:
    Ereu, T.
    Merentes, N.
    Sanchez, J. L.
    Wróbel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255979.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Phi-variation in the sense of Schramm
    uniformly continuous operator
    regularization
    composition operator
    Jensen equation
    locally defined operators
    Opis:
    We prove that any uniformly continuous Nemytskii composition operator in the space of functions of bounded generalized Φ-variation in the Schramm sense is affine. A composition operator is locally defined. We show that every locally defined operator mapping the space of continuous functions of bounded (in the sense of Jordan) variation into the space of continous monotonic functions is constant.
    Źródło:
    Opuscula Mathematica; 2012, 32, 2; 239-247
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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