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    Wyświetlanie 1-11 z 11
    Tytuł:
    Trust region based parametric optimisation for nonlinear systems
    Optymalizacja parametryczna systemów nieliniowych metodą trust region
    Autorzy:
    Baranowski, J.
    Bauer, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/282154.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    optymalizacja parametryczna
    metoda regionu zaufania
    systemy nieliniowe
    uogólniony regulator PID
    parametric optimisation
    trust region method
    nonlinear systems
    generalised PID control
    Opis:
    In this paper, we propose the possibility of solution of parametric optimisation problem with a trust region algorithm. Problem of parameter optimisation is reformulated into initial condition optimisation resulting in analytical formulas for gradients and Hessian which are then subsequently used in the trust region algorithm. An example of nonlinear series DC motor controller optimisation is presented along with some numerical results.
    W pracy przedstawiono możliwości rozwiązania problemu optymalizacji parametrycznej za pomocą algorytmu typu trust region. Problem optymalizacji parametrów sprowadzono do problemu optymalizacji warunków początkowych, otrzymując analityczne wzory na gradient i Hesjan, które są następnie wykorzystane w algorytmie trust region. Przedstawiono również przykład optymalizacji regulatora dla nieliniowego silnika szeregowego wraz z wynikami numerycznymi.
    Źródło:
    Automatyka / Automatics; 2012, 16, 1; 15-24
    1429-3447
    2353-0952
    Pojawia się w:
    Automatyka / Automatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solving Generalized Semi-Infinite Programming Problems with a Trust Region Method
    Autorzy:
    Tezel Özturan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402550.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.60.Pn
    Opis:
    In this paper, a trust region method for generalized semi-infinite programming problems is presented. The method is based on [O. Yi-gui, "A filter trust region method for solving semi-infinite programming problems", J. Appl. Math. Comput. 29, 311 (2009)]. We transformed the method from standard to generalized semi-infinite programming problems. The semismooth reformulation of the Karush-Kuhn-Tucker conditions using nonlinear complementarity functions is used. Under some standard regularity condition from semi-infinite programming, the method is convergent globally and superlinearly. Numerical examples from generalized semi-infinite programming illustrate the performance of the proposed method.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-93-B-96
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trust region methods with hierarchical finite element models for PDE-constrained optimization
    Autorzy:
    Kirchner, A.
    Meidner, D.
    Vexler, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/206108.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    trust region
    model hierarchy
    finite elements
    PDE-constrained optimization
    Opis:
    In this paper, a Hierarchical Trust Region Algorithm for solving PDE-constrained optimization problems is developed. A hierarchy of finite element meshes is used to define a hierarchy of quadratic models for the approximation of the discrete reduced cost functional on the finest mesh. The proposed algorithm simultaneously controls the choice of the model and the size of the trust region radius. Application of the trust region convergence theory allows for proving that every accumulation point of the sequence produced by the algorithm is a stationary point of the discretized problem. Numerical examples illustrate the behavior of the method and show a considerable reduction of computation time compared to the standard Newton trust region scheme.
    Źródło:
    Control and Cybernetics; 2011, 40, 4; 1019-1042
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An SQP trust region method for solving the discrete-time linear quadratic control problem
    Autorzy:
    Mostafa, E. M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/331409.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    programowanie sekwencyjne
    programowanie kwadratowe
    system dyskretno-czasowy
    output feedback control design
    sequential quadratic programming
    trust region method
    Opis:
    In this paper, a sequential quadratic programming method combined with a trust region globalization strategy is analyzed and studied for solving a certain nonlinear constrained optimization problem with matrix variables. The optimization problem is derived from the infinite-horizon linear quadratic control problem for discrete-time systems when a complete set of state variables is not available. Moreover, a parametrization approach is introduced that does not require starting a feasible solution to initiate the proposed SQP trust region method. To demonstrate the effectiveness of the method, some numerical results are presented in detail.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 353-363
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduced order models in PIDE constrained optimization
    Autorzy:
    Sachs, E. W.
    Schu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/969882.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    jump diffusion models
    proper orthogonal decomposition
    trust region method
    TRPOD
    Opis:
    Mathematical models for option pricing often result in partial differential equations originally starting with the Black-Scholes model. In this context, recent enhancements are models driven by Levy processes, which lead to a partial differential equation with an additional integral term. If one solves the problems mentioned last numerically, this yields large linear systems of equations with dense matrices. However, by using the special structure and an iterative solver the problem can be handled efficiently. To further reduce the computational cost in the calibration phase we implement a reduced order model, like proper orthogonal decomposition (POD), which proves to be very efficient. In this paper we use a special multi-level trust region POD algorithm to calibrate the option pricing model and give numerical results supporting the gain in efficiency.
    Źródło:
    Control and Cybernetics; 2010, 39, 3; 661-675
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solving a system of nonlinear equations with the use of optimization methods in problems related to the wheel-rail contact
    Autorzy:
    Jureczko, M.
    Duda, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/122469.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    wheel-rail contact
    system of nonlinear equations
    Newton's method
    trust region method
    Levenberg-Marquardt method
    damped Newton’s method
    styk koło-szyna
    układ równań nieliniowych
    metoda Newtona
    metoda Levenberg-Marquardt
    Opis:
    The article presents the methods for defining the geometry of the contact surface between a rigid wheel and a rigid rail. The calculation model that has been developed allowed for any arrangement of the wheel in relation to the rail. This allowed for the creation of a system of nonlinear equations, the solution of which allows one to determine the presumable wheel-rail contact points. The search for the solution of the system of strongly nonlinear equations was conducted using a few optimization methods. This allowed one to study both the selection of the starting point and the convergence of the method.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 2; 53-64
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
    Autorzy:
    Sun, Xiaoqiang
    Wang, Yujun
    Cai, Yingfeng
    Wong, Pak Kin
    Chen, Long
    Powiązania:
    https://bibliotekanauki.pl/articles/2173619.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous electric vehicles
    direct yaw moment control
    DYC
    tire nonlinear mechanical properties
    nonsingular fast terminal sliding mode
    NFTSM
    trust-region interior-point method
    pojazd elektryczny autonomiczny
    kontrola momentu odchylenia bezpośrednia
    właściwości mechaniczne opon nieliniowe
    niesingularny tryb szybkiego przesuwania terminala
    metoda punktu wewnętrznego regionu zaufania
    Opis:
    To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137065
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NFTSM control of direct yaw moment for autonomous electric vehicles with consideration of tire nonlinear mechanical properties
    Autorzy:
    Sun, Xiaoqiang
    Wang, Yujun
    Cai, Yingfeng
    Wong, Pak Kin
    Chen, Long
    Powiązania:
    https://bibliotekanauki.pl/articles/2128162.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autonomous electric vehicles
    direct yaw moment control
    DYC
    tire nonlinear mechanical properties
    nonsingular fast terminal sliding mode
    NFTSM
    trust-region interior-point method
    pojazd elektryczny autonomiczny
    kontrola momentu odchylenia bezpośrednia
    właściwości mechaniczne opon nieliniowe
    niesingularny tryb szybkiego przesuwania terminala
    metoda punktu wewnętrznego regionu zaufania
    Opis:
    To improve the curve driving stability and safety under critical maneuvers for four-wheel-independent drive autonomous electric vehicles, a three-stage direct yaw moment control (DYC) strategy design procedure is proposed in this work. The first stage conducts the modeling of the tire nonlinear mechanical properties, i.e. the coupling relationship between the tire longitudinal force and the tire lateral force, which is crucial for the DYC strategy design, in the STI (Systems Technologies Inc.) form based on experimental data. On this basis, a 7-DOF vehicle dynamics model is established and the direct yaw moment calculation problem of the four-wheel-independent drive autonomous electric vehicle is solved through the nonsingular fast terminal sliding mode (NFTSM) control method, thus the optimal direct yaw moment can be obtained. To achieve this direct yaw moment, an optimal allocation problem of the tire forces is further solved by using the trust-region interior-point method, which can effectively guarantee the solving efficiency of complex optimization problem like the tire driving and braking forces allocation of four wheels in this work. Finally, the effectiveness of the DYC strategy proposed for the autonomous electric vehicles is verified through the CarSim-Simulink co-simulation results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137065, 1--13
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations between trust, cooperation, norms and values in high-tech enterprises in Wielkopolska region
    Autorzy:
    Libertowska, Andżelika
    Powiązania:
    https://bibliotekanauki.pl/articles/27313711.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    trust
    cooperation
    norms
    values
    social capital
    zaufanie
    współpraca
    normy
    wartości
    kapitał społeczny
    Opis:
    Purpose: The aim of the article is to analyze the results of research on the interdependencies between cooperation, trust, as well as norms and values, as key elements of social capital in high-tech enterprises in Wielkopolska Region. Design/methodology/approach: The analyzes carried out covered 51 enterprises belonging to advanced technology industries, including 41 small and 10 medium-sized ones. The research was conducted using the interview method, using a questionnaire and supported by the CATI technique. The obtained data were subject to further analysis and statistical inference. They consisted in determining the mutual dependencies for the three resources of social capital, i.e. trust, norms and values as well as cooperation (jointly creating the social capital of these enterprises) and their components. The relationships were determined based on the calculated Pearson's linear correlation coefficients. Findings: Based on the conducted analyzes, it is legitimate to conclude that the designated level of cooperation, norms, values and trust are closely related. For all combinations of the indicated resources, the determined Pearson's linear correlation coefficients are statistically significant with a probability of 0.05. Also, many combinations of the components of these resources are correlated with each other. Practical implications: The application dimension of the article is perceived in at least two possibilities. Firstly, for business representatives, it can be a valuable source of information on the key factors in the appreciation of social capital in a company. Secondly, on the basis of the calculated correlations, the article gives the opportunity to review the most important relationships between these components, which may also be useful from the point of view of the appreciation of social capital in the enterprise. It is also worth emphasizing the interdisciplinary nature by combining the scientific and application aspect, which can be used at the level of company management. Originality/value: This work deals with an original approach to social capital, both due to the conceptualization of the concept of social capital and its components, as well as the interrelationships between its components. It is also worth emphasizing the interdisciplinary nature of the work, combining the scientific and application aspects that can be used at the level of company management. Moreover, the methodology described in the research process may be used in enterprises operating in industries other than high-tech.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 158; 369--381
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Life satisfaction and social trust as a component of social capital among students in the Zachodniopomorskie region
    Satysfakcja z życia i zaufanie społeczne jako komponent kapitału społecznego wśród zachodniopomorskich studentów
    Autorzy:
    Będzik, Beata
    Gołąb, Sylwia
    Powiązania:
    https://bibliotekanauki.pl/articles/1182374.pdf
    Data publikacji:
    2020
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    trust
    social capital
    life satisfaction
    SWLS
    zaufanie
    kapitał społeczny
    satysfakcja z życia
    Opis:
    Artykuł wpisuje się w nurt poszukiwań nowych generatorów rozwoju społeczno-gospodarczego. Celem była ocena zaufania społecznego (zgeneralizowanego, do instytucji publicznych) wśród studentów jako obecnych i przyszłych kreatorów i dysponentów tego zasobu oraz weryfikacja zależności między satysfakcją z życia a zaufaniem społecznym w celu poszukiwania mechanizmów jego kreowania. Badania przeprowadzono w 2020 r. z użyciem kwestionariusza SWLS poszerzonego pytaniami o kapitał społeczny. Analizy uzupełniono statystyką opartą na danych ESS. Wyniki potwierdziły dodatnią zależność między satysfakcją z życia a zaufaniem, choć jej siła uwarunkowana była wymiarem zaufania, które było dodatnio skorelowane z przekonaniem o wspieraniu przez władze gminy inicjatyw społecznych oraz o możliwościach wpływania mieszkańców na funkcjonowanie gminy.
    Źródło:
    Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2020, 64, 10; 5-17
    1899-3192
    Pojawia się w:
    Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influences of Social Expectation Toward Leader Power, Leader Practices And Personal Branding to Establish The Leader Trust (Case Study on the Leadership of Bandung and Purwakarta Region on Gen-Z)
    Autorzy:
    Kusumah, Indra
    Iskandar, Tb. Zulrizka
    Sumantri, Suryana
    Harding, Diana
    Rizal, Achmad
    Widianti, Efri
    Powiązania:
    https://bibliotekanauki.pl/articles/1163846.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    leader power
    leadership practices
    perceived
    personal branding
    social expectation
    Opis:
    The objective of this study was to analyze the influence of social expectations on the perceived leadership processes in the form of perceived leader power, perceived leadership practices and perceived personal branding to establish trust in leader on the leader of Bandung and Purwakarta region in the perception of Gen-Z. This research collected the sample of 405 peoples Gen-Z in Bandung and Purwakarta by adopted accidental sampling technique. The data investigated through scale. The analysis technique of this research was Structural Equation Modeling (SEM) using PLS (Partial Least Square) with Smart-PLS software operation. The results of the research revealed that social expectation influenced all variables in the perceived leadership processes to establish trust in leaders. All the stated variables in the leadership process correlated each other in the perception of Gen-Z . The model scheme of the leadership process to establish trust in leader proceeded together with the input stage of social expectations, the process stages of social perception and the output stage of social trust in the context of leadership.
    Źródło:
    World Scientific News; 2018, 108; 64-73
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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