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    Wyświetlanie 1-15 z 15
    Tytuł:
    Geometric optimal control and two-level dissipative quantum systems
    Autorzy:
    Bonnard, B.
    Sugny, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/970909.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optimal control theory
    conjugate and cut loci
    quantum mechanics
    Opis:
    The objective of this article is to present techniques of geometric time-optimal control developed to analyze the control of two-level dissipative quantum systems. Combined with numerical simulations they allow to compute the time-minimal control using a shooting method. The robustness with respect to initial conditions and dissipative parameters is also analyzed using a continuation method.
    Źródło:
    Control and Cybernetics; 2009, 38, 4A; 1053-1080
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Financing university education in Nigeria : a proposal for infrastructure replenishment in universities
    Autorzy:
    Ekhosuehi, V.
    Iguodala, W. A.
    Osagiede, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/406369.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Hamilton–Pontryagin equation
    higher education
    optimal control theory
    replenishment
    university education
    Opis:
    The subject of replenishment of infrastructure in Nigerian public universities has been of great concern to stakeholders in the educational system. How to obtain an appropriate replenishment plan that would give the desired infrastructure for a university after a certain period of time is a long-standing problem. We attempt to find a solution to this problem from an engineering perspective based on optimal control theory. The revenue generated through the payment of school fees and the costs of investment in infrastructure are used to construct the objective function. The state variables are the amount budgeted for such an investment and the stock of infrastructure, while the rate of replenishment is used as the control variable. The problem is solved by utilising Pontryagin’s principle. The dynamics of the replenishment plan is illustrated with an example. The results show that there should be a steady increase in the amount budgeted, in order to attain the desired infrastructure.
    Źródło:
    Operations Research and Decisions; 2016, 26, 4; 33-47
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the optimal exchange rate via control of the domestic interest rate in Nigeria
    Autorzy:
    Ekhosuehi, V. U.
    Ogbonmwan, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/406440.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    balance-of-payments
    domestic interest rate
    exchange rate
    optimal control theory
    statistical control
    Opis:
    An economic scenario has been considered where the government seeks to achieve a favourable balance-of-payments over a fixed planning horizon through exchange rate policy and control of the domestic interest rate. The dynamics of such an economy was considered in terms of a bounded optimal control problem where the exchange rate is the state variable and the domestic interest rate is the control variable. The idea of balance-of-payments was used as a theoretical underpinning to specify the objective function. By assuming that, changes in exchange rates were induced by two effects: the impact of the domestic interest rate on the exchange rate and the exchange rate system adopted by the government. Instances for both fixed and flexible optimal exchange rate regimes have been determined. The use of the approach has been illustrated employing data obtained from the Central Bank of Nigeria (CBN) statistical bulletin.
    Źródło:
    Operations Research and Decisions; 2014, 24, 1; 23-36
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extremal problems for second order hyperbolic systems involving multiple time delays
    Autorzy:
    Kowalewski, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27312006.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    optimal control theory
    boundary control
    second order hyperbolic systems
    multiple time delays
    electric long lines
    Opis:
    Extremal problems for multiple time delay hyperbolic systems are presented. The optimal boundary control problems for hyperbolic systems in which multiple time delays appear both in the state equations and in the Neumann boundary conditions are solved. The time horizon is fixed. Making use of Dubovicki-Milutin scheme, necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance functionals and constrained control are derived.
    Źródło:
    Archives of Control Sciences; 2023, 33, 1; 101--126
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joint queue-perturbed and weakly coupled power control for wireless backbone networks
    Autorzy:
    Olwal, T. O.
    Djouani, K.
    Kogeda, O. P.
    van Wyk, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330956.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie mocą
    sterowanie rozproszone
    sieć szkieletowa
    sterowanie optymalne
    decentralized power control
    singular perturbation theory
    weak coupling theory
    wireless backbone networks
    optimal control theory
    Opis:
    Wireless Backbone Networks (WBNs) equipped with Multi-Radio Multi-Channel (MRMC) configurations do experience power control problems such as the inter-channel and co-channel interference, high energy consumption at multiple queues and unscalable network connectivity. Such network problems can be conveniently modelled using the theory of queue perturbation in the multiple queue systems and also as a weak coupling in a multiple channel wireless network. Consequently, this paper proposes a queue perturbation and weakly coupled based power control approach for WBNs. The ultimate objectives are to increase energy efficiency and the overall network capacity. In order to achieve this objective, a Markov chain model is first presented to describe the behaviour of the steady state probability distribution of the queue energy and buffer states. The singular perturbation parameter is approximated from the coefficients of the Taylor series expansion of the probability distribution. The impact of such queue perturbations on the transmission probability, given some transmission power values, is also analysed. Secondly, the inter-channel interference is modelled as a weakly coupled wireless system. Thirdly, Nash differential games are applied to derive optimal power control signals for each user subject to power constraints at each node. Finally, analytical models and numerical examples show the efficacy of the proposed model in solving power control problems in WBNs.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 749-764
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A semi-active control of lateral vibrations of the overhung rotor using dampers with the magneto-rheological fluid
    Autorzy:
    Michajłow, M.
    Konowrocki, R.
    Szolc, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/127741.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    overhung rotor-shaft
    lateral vibrations
    semi-active control
    optimal control theory
    wał wirnika
    drgania poprzeczne
    sterowanie półaktywne
    teoria sterowania optymalnego
    Opis:
    In the paper there is proposed an algorithm of an efficient semi-active control of steady-state periodic lateral vibrations of the overhung rotor-shaft system. This algorithm has been developed using fundamentals of the Optimal Control Theory. In the considered system the control is realized by means of the linear dampers with the magneto-rheological fluid built in the bearing housing. The computational example demonstrates possibilities of the applied approach resulting in an additional reduction of out-of-resonance and near-resonance harmonic oscillation amplitudes in comparison with an analogous passive control.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 273-280
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insider understanding of country development: a novel application of Optimal Control Theory and Data Envelopment Analysis for benchmarking performance of Chilean and Brazilian companies
    Autorzy:
    Alves Junior, Paulo Nocera
    Yushimito, Wilfredo F.
    Gude, Jorge Pereira
    Melo, Isotilia Costa
    Rebelatto, Daisy Aparecida do Nascimento
    Powiązania:
    https://bibliotekanauki.pl/articles/14430662.pdf
    Data publikacji:
    2019-03-27
    Wydawca:
    Wyższa Szkoła Bankowa we Wrocławiu
    Tematy:
    Data Envelopment Analysis (DEA)
    Optimal Control Theory (OCT)
    Dynamic Efficiency
    Developing Countries
    Inventory Control
    Production-Inventory System
    Benchmarking
    Best Practices.
    Opis:
    Aim: If companies manage their inventory inefficiently, inventory costs can increase significantly due to shortages, overstocking, and risks. Inventory management is critical for company’s success which, in turn, impacts on countries’ development. This paper aims to investigate the efficiency of inventory control systems of companies from Brazil and Chile through Optimal Control Theory and Data Envelopment Analysis. Design/Research methods: Data was collected from Chilean and Brazilian companies covering different industries in which both countries are mostly dependent A new approach using OCT and DEA is applied for dealing with inventory, production, and demand in Dynamic DEA model to benchmark companies’ production-inventory systems. Conclusions/findings: The results show efficient companies among evaluated industries. Such companies are related mainly to Brazilian commerce and Chilean exports. Based on findings, it was possible to identify patterns and relationship among companies and its inventory management. Originality/value of the article: This paper fills a gap in studies including demand, production, and inventory in Dynamic DEA by using OCT to forewarn unrealistic results and observing companies’ behavior. Besides that, this approach is particularly useful for developing countries in this context, determining benchmarks for the most inefficient firms in each sector. Implications of the research: The results show (1) which companies should focus more on improving inventory management, (2) which companies should be used as benchmarks, and (3) it highlights the reasons of different performance of companies in each country. Limitations of the research: For future research, it is suggested including variables and analysis of social and environmental impacts.
    Źródło:
    Central European Review of Economics and Management; 2019, 3, 1; 47-93
    2543-9472
    Pojawia się w:
    Central European Review of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinite time horizon optimal current control of a stepper motor exploiting a finite element model
    Autorzy:
    Bernat, J.
    Stępień, S.
    Stranz, A.
    Szymański, G.
    Sykulski, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200378.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal control theory
    linear quadratic problem
    finite element method
    teoria sterowania optymalnego
    liniowo-kwadratowy problem
    metoda elementów skończonych
    Opis:
    An optimal control theory based method is presented aiming at minimizing the energy delivered from source and the power loss in a stepper motor circuit. A linear quadratic current regulator with an infinite time horizon is employed and its appropriateness for this type of a problem explained. With the purpose of improving the accuracy of the control system, the self and mutual inductances of windings are calculated using a finite element model. The numerically computed results are verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 835-841
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On an optimal control problem for a quasilinear parabolic equation
    Autorzy:
    Farag, S.
    Farag, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1208213.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    existence theory
    parabolic equations
    penalty function methods
    optimal control
    Opis:
    An optimal control problem governed by a quasilinear parabolic equation with additional constraints is investigated. The optimal control problem is converted to an optimization problem which is solved using a penalty function technique. The existence and uniqueness theorems are investigated. The derivation of formulae for the gradient of the modified function is explainedby solving the adjoint problem.
    Źródło:
    Applicationes Mathematicae; 2000, 27, 2; 239-250
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal and game control algorithms of a ship in collision situations at sea
    Autorzy:
    Lisowski, J
    Powiązania:
    https://bibliotekanauki.pl/articles/205923.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    marine navigation
    safety at sea
    safe ship control
    optimal control
    game theory
    Opis:
    This paper presents an application of selected methods of optimal and game control theory to determine own ship safe trajectory when passing other ships encountered in good and in restricted visibility at sea. Five algorithms for determining safe trajectory of the own ship in a collision risk situation: non-cooperative positional game, non-cooperative matrix game, cooperative positional game, dynamic optimization, and kinematic optimization are compared. The analysis is illustrated with examples of computer simulations of the algorithms to determine safe and optimal own ship trajectories in the real navigational situations at sea.
    Źródło:
    Control and Cybernetics; 2013, 42, 4; 773-792
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The linear programming approach to deterministic optimal control problems
    Autorzy:
    Hernández-Hernández, Daniel
    Hernández-Lerma, Onésimo
    Taksar, Michael
    Powiązania:
    https://bibliotekanauki.pl/articles/1339290.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    linear programming (in infinite-dimensional spaces)
    duality theory
    optimal control
    Opis:
    Given a deterministic optimal control problem (OCP) with value function, say $J^*$, we introduce a linear program $(P)$ and its dual $(P^*)$ whose values satisfy $\sup(P^*) \leq\inf(P)\leq J^*(t,x)$. Then we give conditions under which (i) there is no duality gap
    Źródło:
    Applicationes Mathematicae; 1996-1997, 24, 1; 17-33
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal design of cylindrical shells
    Autorzy:
    Nestler, Peter
    Schmidt, Werner
    Powiązania:
    https://bibliotekanauki.pl/articles/729263.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    linear elasticity
    shell theory
    cylindrical tube
    optimal control
    shape optimization
    Opis:
    The present paper studies an optimization problem of dynamically loaded cylindrical tubes. This is a problem of linear elasticity theory. As we search for the optimal thickness of the tube which minimizes the displacement under forces, this is a problem of shape optimization. The mathematical model is given by a differential equation (ODE and PDE, respectively); the mechanical problem is described as an optimal control problem. We consider both the stationary (time independent) and the transient (time dependent) case. P. Nestler derives the model-equations from the Mindlin and Reissner hypotheses. Then, necessary optimality conditions for the optimal control problem are given. Numerical solutions are obtained by FEM, numerical examples are presented.
    Źródło:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2010, 30, 2; 253-267
    1509-9407
    Pojawia się w:
    Discussiones Mathematicae, Differential Inclusions, Control and Optimization
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The branch-and-bound method and genetic algorithm in avoidance of ships collisions in fuzzy environment
    Autorzy:
    Mohamed-Seghir, Mostefa
    Powiązania:
    https://bibliotekanauki.pl/articles/259091.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    safe ship control
    optimal control
    safe trajectories
    branch and bound method
    genetic algorithm
    ship control
    fuzzy set theory
    Opis:
    Marine navigation consists in continuous observation of the situation at sea, determination the anti-collision manoeuvre. So it necessary to determine ship safe trajectory as a sequence of ship course changing manoeuvres. Each manoeuvre is undertaken on the basis of information obtained from the anti-collision system ARPA. This paper describes a method of safe ship control in the collision situation in a fuzzy environment based on a branch and bound method and a genetic algorithm. The optimal safe ship trajectory in a collision situation is presented as multistage decision-making process.
    Źródło:
    Polish Maritime Research; 2012, S 1; 45-49
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Discrete approximation of nonconvex hyperbolic optimal control problems with state constraints
    Autorzy:
    Chryssoverghi, I.
    Bacopoulos, A.
    Coletsos, J.
    Kokkinis, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/205975.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    dyskretyzacja
    nieliniowy układ hiperboliczny
    sterowanie optymalne
    zasada minimum
    discretization
    existence theory
    minimum principle
    nonlinear hyperbolic systems
    optimal control
    relaxed controls
    Opis:
    We consider an opitmal control problem for systems defined by nonlinear hyperbolic partial differential equations with state constraints. Since no convexity assumptions are made on the data, we also consider the control problem in relaxed form. We discretize both the classical and the relaxed problenms by using a finite element method in space and a finite difference scheme in time, the controls being approximated by piecevise constant ones. We develop the existence theory and the necessary conditions for optimality, for the continous and the discrete problems. Finally, we study the behaviour in the limit of discrete optimality, admissibility and extremality properties.
    Źródło:
    Control and Cybernetics; 1998, 27, 1; 29-50
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie niepewności w aspekcie podejmowania optymalnych decyzji polityki pieniężnej i fiskalnej
    The importance of uncertainty in terms of optimal monetary and fiscal policy decisions
    Autorzy:
    Przybylska-Mazur, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/590838.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Decyzje optymalne
    Decyzje polityki pieniężnej i fiskalnej
    Model polityki gospodarczej
    Niepewność
    Sterowanie optymalne
    Control theory
    Economic policy model
    Monetary and fiscal policy decisions
    Optimal decision
    Uncertainty
    Opis:
    Celem artykułu jest wyznaczenie optymalnych reguł polityki pieniężnej i fiskalnej na podstawie teorii sterowania optymalnego. Wyznaczone reguły są rozwiązaniem modelu polityki gospodarczej, składającego się z funkcji kryterium oraz modelu gospodarki. W artykule zweryfikowano hipotezę, że w warunkach niepewności reakcje decydentów są mniej gwałtowne niż w sytuacji braku niepewności. Instrumentami badawczymi są rozwiązania modelu gospodarki, w którym nie uwzględniamy niepewności, a także rozwiązania modeli, w których uwzględniamy istnienie niepewności: modelu addytywnego polityki gospodarczej oraz modelu zawierającego niepewność sterowania. Na podstawie przeprowadzonej analizy empirycznej można zauważyć, że identyczne są optymalne decyzje wyznaczone na podstawie modelu, w którym nie wzięto pod uwagę niepewności i addytywnego modelu polityki gospodarczej. Zauważono wpływ na optymalne decyzje niepewności, przedstawionej w postaci multiplikatywnego składnika losowego, występującego w macierzy wpływu instrumentów polityki pieniężnej i fiskalnej na zmienne stanu.
    The aim of this article is the calculation of the optimal monetary and fiscal policy rule based on optimal control theory. The calculated rules are a solution of economic policy model that consists of the criterion function and model of economy. In this article we verify the hypothesis that in conditions of uncertainty the reactions of decision- -makers concerning the monetary and fiscal policy instruments are less violent than in the absence of uncertainty. Research tools to verify this hypothesis are the solutions of model in which we do not take into account the uncertainty and solutions of models in which we take into account the uncertainty: the additive economic policy model, as well as the model containing the uncertainty of control, On the basis of the empirical analysis, we can see that the optimal monetary and fiscal policy decisions are identical in the case of a model in which we do not take into account the uncertainty and in case of additive economic policy model. We can also noted the impact the multiplicative random component in the matrix of the influence of monetary and fiscal policy instruments on the optimal decisions.
    Źródło:
    Studia Ekonomiczne; 2017, 324; 78-90
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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