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Wyświetlanie 1-15 z 17
Tytuł:
Adherence of minimizers for dual convergences
Autorzy:
Dolecki, S.
Powiązania:
https://bibliotekanauki.pl/articles/970255.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stability of minimizers
continuous convergence
dual topologies
Opis:
It is proved that many known convergences (e.g., continuous convergence, Isbell topology, compact-open topology, point-wise convergence) on the space of continuous maps (valued in a topological space) can be represented as the dual convergences with respect to collections of families of sets, and that they can be characterized in terms of the corresponding hyperspace convergences of the inverse images of closed sets. As a result, the convergence of real-valued functions for a dual convergence implies the convergence of their sets of minima on the corresponding hyperspace.
Źródło:
Control and Cybernetics; 2007, 36, 3; 647-658
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On parametric Hurwitz stability margin of real polynomials
Autorzy:
Husek, P.
Powiązania:
https://bibliotekanauki.pl/articles/1839184.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
robust stability
parametric uncertainty
continuous-time systems
Opis:
The paper deals with the problem of determining Hurwitz stability of a ball of polynomials defined by a weighted lp norm in the coefficient space where p is an arbitrary positive integer including infinity. The solution of the case when the weights are supposed to be the same for coefficient being above and below its nominal value corresponding to symmetric ball has been given by Tsypkin and Polyak. However, sometimes it seems to be useful to have a possibility to consider these weights as different, resulting in the asymmetric ball. This is, for example, the situation where the weights express our level of confidence that the real value of a coefficient lies in some interval. Such approach is used if the value of a coefficient is estimated by an expert. Solution of the problem is based on frequency domain plot in the complex plane and on applying the Zero Exclusion Theorem. The main idea consists in separation of the original problem into four subproblems and using an appropriate coordinate transformation which makes the value set independent of frequency. This transformation makes it possible to move the relative value set into the origin of the complex plane and to easily formulate the necessary and sufficient condition of Hurwitz stability of asymmetric ball of polynomials with prescribed radius or determine the maximum radius preserving stability. The whole graphical procedure consists of four plots instead of one, needed in the symmetric case.
Źródło:
Control and Cybernetics; 2008, 37, 3; 549-563
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realization problem for singular positive continuous-time systems with delays
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/969739.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
realization
positive
singular
continuous-time
system
existence
procedure
Opis:
The positive realization problem for a class of singular continuous-time linear SISO systems with delays in state and in output is addressed. The notions of canonical forms of matrices and of dual systems are extended for singular linear systems with delays. Necessary and sufficient conditions for positivity of SISO singular continuous-time systems with delays and sufficient conditions for the existence of a positive singular realization are established. A procedure for computation of a positive singular realization of a given transfer function is proposed and illustrated by a numerical example.
Źródło:
Control and Cybernetics; 2007, 36, 1; 47-57
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wellposedness and exponential decay rates for the Moore-Gibson-Thompson equation arising in high intensity ultrasound
Autorzy:
Kaltenbacher, B.
Lasiecka, I.
Marchand, R.
Powiązania:
https://bibliotekanauki.pl/articles/206112.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
high intensity ultrasound
strongly continuous semigroup
exponential stability
Opis:
We consider the Moore-Gibson-Thompson equation which arises, e.g., as a linearization of a model for wave propagation in viscous thermally relaxing fluids. This third order in time equation displays, even in the linear version, a variety of dynamical behaviors for their solutions that depend on the physical parameters in the equation. These range from non-existence and instability to exponential stability (in time). It will be shown that by neglecting diffusivity of the sound coefficient there arises a lack of existence of a semigroup associated with the linear dynamics. More specifically, the corresponding linear dynamics consists of three diffusions: two backward and one forward. When diffusivity of the sound is positive, the linear dynamics is described by a strongly continuous semigroup which is exponentially stable when the ratio of sound speed×relaxation parameter/ sound diffusivity is sufficiently small, and unstable in the complementary regime. The theoretical estimates proved in the paper are confirmed by numerical validation.
Źródło:
Control and Cybernetics; 2011, 40, 4; 971-988
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANFIS-based PID continuous sliding mode controller for robot manipulators in joint space
Autorzy:
Elawady, Wael M.
Asar, Mohammed F.
Sarhan, Amany M.
Powiązania:
https://bibliotekanauki.pl/articles/1839129.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
PID
continuous sliding mode control
ANFIS
uncertainties
robot
Opis:
This paper presents a feasible design for a con- trol algorithm to synthesize an adaptive neuro-fuzzy inference system-based PID continuous sliding mode control system (ANFIS- PIDCSMC) for adaptive trajectory tracking control of the rigid robot manipulators (RRMs) in the joint space. First, a PID sliding mode control algorithm with sliding surface dynamics-based continuous proportional-integral (PI) control action (PIDSMC-SSDCPI) is presented. The global stability conditions are formulated in terms of Lyapunov full quadratic form such that the robot system output can track the desired reference output. Second, to increase the control system robustness, the PI control action in the PIDSMC- SSDCPI controller is supplanted by an ANFIS control signal to provide a control approach that can be termed adaptive neuro-fuzzy inference system-based PID continuous sliding mode control system (ANFIS-PIDCSMC). For the proposed control algorithm, numerical simulations using the dynamic model of RRM with uncertainties and external disturbances show high quality and effectiveness of the adopted control approach in high-speed trajectory tracking control problems. The simulation results that are compared with the results, obtained for the traditional controllers (standalone PID and traditional sliding mode controller (TSMC)), illustrate the fact that the tracking control behavior of the robot system achieves acceptable tracking performance.
Źródło:
Control and Cybernetics; 2019, 48, 4; 525-555
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilization of fractional positive continuous-time linear systems with delays in sectors of left half complex plane by state-feedbacks
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/969916.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fractional
positive
continuous-time
linear
system
state-feedback
stabilization
Opis:
The problem of stabilization of fractional positive linear continuous-time linear systems with delays by state-feedbacks is addressed. The gain matrix of the state feedback is chosen so that the zeros of the closed-loop polynomial are located in a sector of the left half of complex plane. Necessary and sufficient conditions for the solvability of the problem are established and a procedure for computation of a gain matrix of the feedback is proposed. The considerations are illustrated by a numerical example.
Źródło:
Control and Cybernetics; 2010, 39, 3; 783-795
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An existence theorem for set differential inclusions in a semilinear metric space
Autorzy:
De Blasi, F. S.
Lakshmikantham, V.
Bhaskar, T. G.
Powiązania:
https://bibliotekanauki.pl/articles/970280.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
approximate continuous selections
Cauchy problem
set differential inclusions
Hukuhara derivative
Opis:
Using the notion of continuous approximate selections, we establish an existence theorem for set differential inclusions in a semi-linear metric space.
Źródło:
Control and Cybernetics; 2007, 36, 3; 571-582
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic network functional comparison via approximate-bisimulation
Autorzy:
Donnarumma, F.
Murano, A.
Prevete, R.
Powiązania:
https://bibliotekanauki.pl/articles/206758.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
continuous time recurrent neural network
dynamic networks
bisimulation
network equivalence
Opis:
It is generally unknown how to formally determine whether different neural networks have a similar behaviour. This question intimately relates to the problem of finding a suitable similarity measure to identify bounds on the input-output response distances of neural networks, which has several interesting theoretical and computational implications. For example, it can allow one to speed up the learning processes by restricting the network parameter space, or to test the robustness of a network with respect to parameter variation. In this paper we develop a procedure that allows for comparing neural structures among them. In particular, we consider dynamic networks composed of neural units, characterised by non-linear differential equations, described in terms of autonomous continuous dynamic systems. The comparison is established by importing and adapting from the formal verification setting the concept of δ−approximate bisimulations techniques for non-linear systems. We have positively tested the proposed approach over continuous time recurrent neural networks (CTRNNs).
Źródło:
Control and Cybernetics; 2015, 44, 1; 99-127
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Readiness of low complexity ERP for continuous auditing in SMEs: The Brazilian case study
Autorzy:
Goncalves, Rosana Carmen M. Grillo
Imoniana, Joshua Onome
Powiązania:
https://bibliotekanauki.pl/articles/2183483.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
internal audit
continuous auditing
internal control
low complexity ERP
SME
Opis:
The continuous auditing technology assures integrity of accounting systems and consequently improves the decision-making process of the small and medium-sized enterprises (SMEs) that implement it. Considering that SMEs located in developing countries function within a more risk prone environment and do not have resources to implement all layers of customized corporate functions in information systems, one argues for their reliance on the features of low complexity of enterprise resource planning (ERP) software to benefit from continuous auditing (CA). The purpose of this study is to relate the understanding of the CA demands and low complexity ERP systems’ technical functionalities in SMEs. Thus, to fulfill this objective, a conceptual model has been drawn to integrate the key concepts related to CA. Four pillars are the core of this model, namely: segregation of duties (SoD) with role-based access control centered on process-based approach (PBA); internal checkpoints; audit trails; and the level of integration of the continuous auditing software. This model was validated through the benchmarking of the implementation of the pillars in three cases of low complexity ERP systems adopted by SMEs in a developing country. The benchmarking/results of the study show significant differences between operational mechanisms of the three ERP software. Namely, the role-based access control exists in the two of the ERP LC but not in the Brazilian one. Also, there is no check-point in the Brazilian ERP LC and it does not integrate with continuous audit features. This study distinguishes between the low complexity ERP’s functionalities and the features of a more complex environment, thus bringing an important contribution to the study of low complexity ERP’s readiness for continuous monitoring in SME’s internal auditing processes.
Źródło:
Control and Cybernetics; 2022, 51, 3; 389--419
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viability and generalized differential quotients
Autorzy:
Girejko, E.
Bartosiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/970016.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
viability
differential inclusion
generalized differential quotient (GDQ)
contingent derivative
Cellina continuous approximability (CCA)
Opis:
Necessary and sufficient conditions for a set-valued map K : R → Rn to be GDQ-differentiable are given. It is shown that K is GDQ differentiate at to if and only if it has a local multiselection that is Cellina continuously approximable and Lipschitz at to. It is also shown that any minimal GDQ of K at (to,yo) is a subset of the contingent derivative of K at (to,yo), evaluated at 1. Then this fact is used to prove a viability theorem that asserts existence of a solution to the initial value problem y(t) ∈ F(t, y(t)), with y(to) =yo, where F : Gr(K) → Rn is an orientor field (i.e. multivalued vector field) defined only on the graph of K and K : T → Rn is a time-varying constraint multifunction. One of the assumptions is GDQ differentiability of K.
Źródło:
Control and Cybernetics; 2006, 35, 4; 815-829
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superlinear elliptic systems with distributed and boundary controls
Autorzy:
Bors, D.
Powiązania:
https://bibliotekanauki.pl/articles/970975.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
zagadnienie brzegowe
stabilność
metoda wariacyjna
boundary value problems
continuous dependence
stability
variational methods
Opis:
The paper investigates the nonlinear partial differential equations of the superlinear elliptic type with the Dirichlet boundary data. Some sufficient conditions, under which the solutions of considered equations depend continuously on distributed and boundary controls, are proved. The proofs of the main results are based on variational methods.
Źródło:
Control and Cybernetics; 2005, 34, 4; 987-1004
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of SVR with improved ant colony optimization algorithms in exchange rate forecasting
Autorzy:
Hung, W. M.
Hong, W. C.
Powiązania:
https://bibliotekanauki.pl/articles/969706.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
support vector regression (SVR)
continuous ant colony optimization algorithms (CACO)
exchange rates
financial forecasting
Opis:
Traditional time series forecasting models, like ARIMA and regression models, can hardly capture nonlinear patterns. Support vector regression (SVR), a novel neural network technique, has been successfully used to solve nonlinear regression and time series problems. The SVR model applies the structural risk minimization principle to minimize the upper bound of the generalization error, instead of minimizing the training error, employed by most conventional neural network models. Thus, parameter determination for an SVR model is appropriate for achieving high forecasting accuracy. Several evolutionary algorithms, such as genetic algorithms and simulated annealing algorithms have been used in parameter selection, but these algorithms often suffer from the possibility of being trapped in local optimum. This study used an improved ant colony optimization algorithm in an SVR model, called SVRCACO, for selecting suitable parameters, with encouraging local search in areas where forecasting accuracy improvement continues to be made, then, autocatalytically converge to promising regions. Numerical examples of exchange rate forecasting from the existing literature are employed to assess the performance of the proposed model. Experimental results show that the proposed model outperforms other approaches from the literature.
Źródło:
Control and Cybernetics; 2009, 38, 3; 863-891
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second order conditions in optimal control problems with mixed equality-type constraints on a variable time interval
Autorzy:
Osmolovskii, N. P.
Powiązania:
https://bibliotekanauki.pl/articles/970741.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
piecewise continuous control
maximum principle
second order necessary or sufficient conditions
critical cone
quadratic form
Opis:
This paper provides an analysis of second-order necessary or sufficient optimality conditions of Pontryagin or bounded strong minima, for optimal control problems of ordinary differential equations, considered on a nonfixed time interval, with constraints on initial-final time-state as well as mixed state-control constraints of equality type satisfying condition of linear independence of gradients w.r.t. control.
Źródło:
Control and Cybernetics; 2009, 38, 4B; 1535-1556
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Control of delay plants via continuous-time GPC principle
Autorzy:
Kowalczuk, Z.
Suchomski, P.
Powiązania:
https://bibliotekanauki.pl/articles/206549.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
stabilność
sterowanie
continuous-time systems
control design problem
delay
predictive control
system design
closed loop stability
Opis:
The continuous-time generalised predictive control (CGPC) is considered in the context of control of continuous-time systems having a transportation delay. It is shown that the basic CGPC design strategy can be given in a form which facilitates a clear discussion of relevant design consequences concerning stability issues. The main results that follow incorporate several solutions to the delay-plant control design problem and a verification of the proposed algorithms in terms of the closed-loop stability.
Źródło:
Control and Cybernetics; 1999, 28, 2; 291-314
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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