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    Wyświetlanie 1-7 z 7
    Tytuł:
    Minimum variance control of discrete-time and continuous-time LTI MIMO systems - a new unified framework
    Autorzy:
    Hunek, W. P.
    Latawiec, K. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/969698.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    minimum variance control
    continuous-time minimum variance control
    theory of emulation
    multivariable systems
    multivariable zeros
    Opis:
    This paper presents a new uniform framework for solving the problem of minimum variance control of both discrete-time and continuous-time linear time-invariant multi-input multi-output systems described by general input-output models. Rather surprisingly, it is shown that the continuous-time case can be analyzed and synthesized without the necessity of involving the celebrated (and rather complex) theory of output predictor emulation, so that quite similar, simple solution is obtained like for the well-known discrete-time case.
    Źródło:
    Control and Cybernetics; 2009, 38, 3; 609-624
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vector space of increments
    Autorzy:
    Borawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206256.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    incremental arithmetic
    vector space
    vector calculus
    standard deviation increment
    variance increment
    Opis:
    The article discusses definitions of vector space for variance increment and standard deviation increment, as well as definition of scalar product for variance increment. This justifies using a vector calculus for variance increment and allows for emplyoing vector calculus methods for variance recalculated into variance increment. The paper also presents a practical example of combining images from sector-scan sonar based on comparison made between local increments of variance.
    Źródło:
    Control and Cybernetics; 2012, 41, 1; 145-170
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing for a difference between conditional variance functions of nonlinear time series
    Autorzy:
    Ćwik, J.
    Koronacki, J.
    Mielniczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/205552.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    conditional variance
    homogeneity test for conditional variances
    nonlinear time series
    nonparametric autoregression
    volatility
    Opis:
    In this report, the problem of testing for a difference between conditional variance fnuctions (or volatilites) of two independent nonlinear time series is investigated by means of an extensive simulation study. Empirical results on the properties of the test proposed confirm the test's validity, at least for some types of heteroscedasticity as contrasted with homnoscedastic erroos as well as for some types of differences in heteooscedasticity. Moreover, interesting properties of several estimators of conditional mean, variance and fourth moment functions are empirically found too.
    Źródło:
    Control and Cybernetics; 2000, 29, 1; 33-50
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equilibrium reinsurance-investment strategy for mean-variance insurers under state dependent risk aversion
    Autorzy:
    Alia, Ishak
    Chighoub, Farid
    Powiązania:
    https://bibliotekanauki.pl/articles/1839127.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    time inconsistency
    mean-variance criterion
    investment-reinsurance strategy
    insurer
    equilibrium strategy
    forward-backward stochastic differential equation
    Opis:
    In this work, we study the equilibrium reinsurance/ new business and investment strategy for mean-variance insurers, under the assumption that the risk aversion is a function of current wealth level. The surplus of the agents is represented by a sum of a compound process and a linear premium perturbed with a Brownian component. The financial market consists of one riskless asset and a multiple risky assets whose price processes are driven by Poisson random measures and independent Brownian motions. We characterize explicit expressions for the time-consistent Nash equilibrium strategy and the equilibrium value function via a forward-backward stochastic system and an equilibrium condition. An interesting feature of these FBSDEs is that a time parameter is involved, so that they form a flow of FBSDEs. Furthermore, a feedback representation of an equilibrium solution is derived. This solution provides a tool for comparing the equilibrium strategy with those derived in other papers, where some special cases were studied by the dynamic programming argument.
    Źródło:
    Control and Cybernetics; 2019, 48, 4; 489-523
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two factors utility approach
    Autorzy:
    Kulikowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/206747.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja
    expected return
    investment allocation
    optimum investment strategies
    portfolio optimization
    portfolio variance
    risk aversion
    utility function
    worse case return
    Opis:
    This paper deals with optimization of portfolios composed of securities (equities). The drawbacks of existing methodologies, based on a single factor utility function, are indicated. The two-factor utility function introduced takes into account the expected excess return and expected worst case return (both in monetary units). Assuming that utility is "risk averse" and "constant returns to scale", a theorem on existence of optimum strategy of investments is proven. The optimum strategy is derived in an explicit form. A numerical example is also given.
    Źródło:
    Control and Cybernetics; 1998, 27, 3; 417-428
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Portfolio optimization - two rules approach
    Autorzy:
    Kulikowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/206858.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja
    optymalizacja portfela
    expected return
    investment allocation
    optimum investment strategies
    portfolio optimization
    portfolio variance
    risk aversion
    utility function
    worse case return
    Opis:
    The new approach to the portfolio optimization, based on the concept of two-factor utility function, is proposed. The first factor describes the expected average profit, while the second - the worse case profit. Then, two rules enabling one to compose an optimum portfolio are formulated. The first rule determines the level of acceptance for all assets with given risk/return ratio. The second rule enables one to allocate the investment fund among all the accepted assets. The methodology proposed does not require to specify the individual utility function in an explicit form. It can be used to optimize portfolios composed of equities as well as bond and other securities, using a passive or - active management strategy.
    Źródło:
    Control and Cybernetics; 1998, 27, 3; 429-446
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of variance function estimators for autoregressive time series of order one: asymptotic normality and numerical study
    Autorzy:
    Borkowski, P.
    Mielniczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/206217.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    autoregressive process
    bandwidth
    heteroscedasticity
    integrated squared error
    local linear and local maximum likelihood estimator
    difference-based estimator
    geometric moment contraction
    variance function
    volatility
    Opis:
    We study performance of several conditional variance estimators for an autoregressive time series which include local linear smoothers with various bandwidths, local likelihood and difference-based estimators. In the theoretical part, asymptotic normality of the local linear estimator of variance with no mixing assumptions imposed on the underlying process is proved. Moreover, numerical examples performed reveal that a two-stage local linear smoother with a bandwidth, proposed by Ruppert, Sheather and Wand, used to estimate the regression function and a simple rule of thumb bandwidth for variance estimation performs best for variances without much structure, whereas the bandwidth considered by Fan and Yao works very well for much more variable variances.
    Źródło:
    Control and Cybernetics; 2012, 41, 2; 415-441
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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