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    Tytuł:
    Stabilization of Second-order Systems by Non-linear Feedback
    Autorzy:
    Skruch, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/907952.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    układ drugiego rzędu
    teoria stabilności
    sterowanie nieliniowe
    second-order system
    stability theory
    non-linear feedback
    Opis:
    A stabilization problem of second-order systems by non-linear feedback is considered. We discuss the case when only position feedback is available. The non-linear stabilizer is constructed by placing actuators and sensors in the same location and by using a parallel compensator. The stability of the closed-loop system is proved by LaSalle's theorem. The distinctive feature of the solution is that no transformation to a first-order system is invoked. The results of analytic and numerical computations are included to verify the theoretical analysis and the mathematical formulation.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 4; 455-460
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upgraded low voltage analog Current-to-Voltage converter with negative feedback
    Autorzy:
    Wojtyna, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/397781.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog signal processing
    current-to-voltage converters
    feedback theory
    analog CMOS electronics
    analogowe przetwarzanie sygnałów
    przetworniki prądowo-napięciowe
    teoria sprzężenia zwrotnego
    CMOS
    Opis:
    In this paper, an improved version of a current to voltage (C-V) converter is proposed. As compared to the previous version, the number of used transistors has been reduced by 1 and equals 7. The main results of this change are: an improvement of the circuit transfer function linearity, reduction the converter input resistance and decrease of the required supply voltage. Improvements in the considered converter results not only from the reduction of the number of the used transistors but also from the proposed realization of the feedback loop. In this way, it was possibly to get a strong loop gain. As a results, the achieved minimum supply voltage has been reduces from 2V, in case of the previous published converter version, to as low level as 1.2 V, in the case of the newly proposed solution. As for the linearity of the C-V transfer function, apart from its strong loop gain, an important role play also output transistors operating in a small drain to source region (linear region). Working in this region, one obtains a quasi linear voltage to current relationship. The theoretical and simulation results are in a good agreement and are promising.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2017, 8, 2; 80-84
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does Science Progress Towards Ever Higher Solvability Through Feedbacks Between Insights and Routines?
    Autorzy:
    Marciszewski, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/561316.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Semiotyczne
    Tematy:
    Algorithm
    arithmetic
    axiom
    axiomatic formalized theory
    concept
    decidability
    feedback
    insight (intuition)
    mathematics
    mechanism
    mentalism
    oracle
    problem
    problem-solving
    progress
    routine procedure
    science
    solvability
    Opis:
    The affirmative answer to the title question is justified in two ways: logical and empirical. (1) The logical justification is due to Gödel’s discovery (1931) that in any axiomatic formalized theory, having at least the expressive power of PA (Peano Arithmetic), at any stage of development there must appear unsolvable problems. However, some of them become solvable in a further development of the theory in question, owing to subsequent investigations. These lead to new concepts, expressed with additional axioms or rules. Owing to the so-amplified axiomatic basis, new routine procedures like algorithms, can be reached. Those, in turn, help to gain new insights which lead to still more powerful axioms, and consequently again to ampler algorithmic resources. Thus scientific progress proceeds to an ever higher scope of solvability. (2) The existence of such feedback cycles – in a formal way rendered with Turing’s systems of logic based on ordinal (1939) – gets empirically supported by the history of mathematics and other exact sciences. An instructive instance of such a process is found in the history of the number zero. Without that insight due to some ancient Hindu mathematicians there could not arise such an axiomatic theory as PA. It defines the algorithms of arithmetical operations, which in turn help intuitions; those, in turn, give rise to algorithmic routines, not available in any of the previous phases of the process in question. While the logical substantiation of the point of this essay is a well-established result of logico-semantic inquiries, its empirical claim, based on historical evidences, remains open for discussion. Hence the author’s intention to address philosophers and historians of science, and to encourage their critical responses.
    Źródło:
    Studia Semiotyczne; 2018, 32, 2; 153-185
    0137-6608
    Pojawia się w:
    Studia Semiotyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIPP-SD) w pracy terapeutycznej z rodzicami dzieci z grupy ryzyka rozwojowego
    The Method of Video-feedback Intervention to Promote Positive Parenting and Sensitive Discipline (VIPP-SD) in Therapeutic Work with Parents of Children in the Development Risk Group
    Autorzy:
    Kopeć, Danuta
    Kubiak, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/15838130.pdf
    Data publikacji:
    2020-12-29
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIP-P-SD)
    attachment theory
    parental sensitivit
    coercion theory
    development risk of children
    mental disorders of children
    mental disorders of parents
    Opis:
    Video-feedback Intervention to promote Positive Parenting and Sensitive Discipline (VIPP-SD) is a therapeutic intervention based on video-feedback which aims to support positive parenting and sensitive parental discipline. It is a part of evidence-based therapeutic interventions, which means that the effectiveness of the training has been confirmedin rigorously planned and carried out studies of both the general population and various clinical groups. The theoretical framework for VIPP-SD is attachment theory and coercion theory. The basic principle of intervention is referring to family resources in the therapeutic work, primarily in situations in which the correct course of a child’s development can be disturbed by both biological and environmental factors. The article presents the aspects of the application of VIPP-SD in the following clinical groups: families with children at risk of improper development, families in which the functioning of parents creates the development risk for children, and the family environment as a risk factor for children’s development.
    Źródło:
    Studia Edukacyjne; 2018, 49; 315-333
    1233-6688
    Pojawia się w:
    Studia Edukacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design a robust quantitative feedback theory controller for cyber-physical systems: ship course control problem
    Autorzy:
    Abadi, Ali Soltani Sharif
    Hosseinabadi, Pooyan Alinaghi
    Ordys, Andrew
    Grimble, Michael
    Powiązania:
    https://bibliotekanauki.pl/articles/2175111.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quantitative feedback theory
    Denial-of-Service
    robust control
    cyber-physical systems
    Opis:
    One of the most critical problems in all practical systems is the presence of uncertainties, internal and external disturbances, as well as disturbing noise, which makes the control of the system a challenging task. Another challenge with the physical systems is the possibility of cyber-attacks that the system’s cyber security against them is a critical issue. The systems related to oil and gas industries may also be subjected to cyber-attacks. The subsets of these industries can be mentioned to the oil and gas transmission industry, where ships have a critical role. This paper uses the Quantitative Feedback Theory (QFT) method to design a robust controller for the ship course system, aiming towards desired trajectory tracking. The proposed controller is robust against all uncertainties, internal and external disturbances, noise, and various possible Deception, Stealth, and Denial-of-Service (DOS) attacks. The robust controller for the ship system is designed using the QFT method and the QFTCT toolbox in MATLAB software. Numerical simulations are performed in MATLAB/Simulink for two case studies with disturbances and attacks involving intermittent sinusoidal and random behavior to demonstrate the proposed controller.
    Źródło:
    Archives of Control Sciences; 2022, 32, 3; 589--605
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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