Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Brain activities demonstrate chaotic behaviors which can be simulated by the outputs of chaotic systems such as Hénon map. Brain stimulation has been used to control the brain dynamics to treat certain neurological disorders such as Parkinson's disease and Epilepsy. However, these clinical practices are based on empirical trials and lack theoretical support. Moreover, the long-term effect of brain...
In this paper, the eigenvalue problem for self-adjoint linear Hamiltonian systems with nonlinear dependence on the spectral parameter and parameter dependent boundary conditions is considered. A Newton-type iterative solution method is presented. The method has a quadratic convergence and provides a two-sided estimate of the eigenvalue. With the help of this technique the boundary control problem...
In the natural phenomenon, many systems are unstable. Moreover, the systems in the universe often have large order. The system that has a large order is more complicated than the system that has a small order. Therefore, we need to simplify the order of the system without any significant errors. Simplification of the system can be done using the reduction of the model. Model reduction can only be...
In this contribution we introduce an efficient simulation scheme for a class of hyperbolic dynamic systems, which model the age-structured evolution of a microorganism population in a bio reactor. Due to the non-local boundary condition and the semilinear transient behavior, standard methods like finite-differences do not lead to satisfactory results, even at high approximation orders. This gives...
In this paper, we propose torque-modulated backstepping control for uniform tracking errors in the vertical motion of two-dimensional electromagnetic scanners using only output measurement. Due to manufacturing tolerance, there are parameter uncertainties of two-dimensional electromagnetic scanners so that it is not easy to obtain uniform tracking error performance for the motion control of scanners...
We present an analysis of extended, FDTD-like methods which is based on the eigenvalues of the iteration matrix. For a stable update scheme these eigenvalues must lie within the unit circle, and this kind of analysis is applied to systems with radiation losses. For small models, it is possible to compute the eigenvalues numerically and to compare them to the spectrum of the corresponding time-continuous...
Academic performance is one of the indicators to evaluate the achievement of college students, which plays an important role in individual development. However, it is worth mentioning that personality traits and thinking styles have an influence on academic performance. To further study the correlation among personality traits, thinking styles and academic performance, we carry out a series of experiments...
We present the theory of sequences of random graphs and their convergence to limit objects. Sequences of random dense graphs are shown to converge to their limit objects in both their structural properties and their spectra. The limit objects are bounded symmetric functions on [0,1]2. The kernel functions define an equivalence class and thus identify collections of large random graphs who are spectrally...
We report on certain cloaking strategies for transient heat transfer. Regularized Kohn's transform is employed to design cylindrical cloaks and to prove a near-cloak result. Our main result says that, after the lapse of a certain threshold time, the temperature field outside the cylindrical cloak is close to that of the uniformly conducting medium irrespective of the conductivity enclosed in the cloaked...
In this paper we study the problem of automatically generating polynomial solvers for minimal problems. The main contribution is a new method for finding small elimination templates by making use of the syzygies (i.e. the polynomial relations) that exist between the original equations. Using these syzygies we can essentially parameterize the set of possible elimination templates. We evaluate our method...
Chaotic dynamics of a four-edge simply supported rectangular thin plate under in-plane excitation are studied using the multi-degree-of-freedom Melnikov method. Based on the von Karman type equations for the geometric nonlinearity, the governing equations of motion for the four-edge simply supported rectangular thin plate under in-plane excitation are derived. The Galerkin method is employed to discretize...
An abnormal detection method is proposed for promotion of efficiency of state assessment because pipeline working state is judged by equipments status and oil parameters. Based on pipeline intellectualization, the pipeline data model is built rely on pipeline data. Then, the spectral analysis of random matrix is used to analyze data matrix containing multivariable time series. The distance indicator...
In order to find a set of optimal discriminant vectors which can maximize the inter-class scatter while simultaneously minimizing the intra-class scatter after the projection, a new algorithm of orthogonal optimal discriminant vectors and a new algorithm of statistically uncorrelated optimal discriminant vectors for feature extraction were proposed. Compared with the original MMC feature extraction...
Many applications of induction machines require a model and its electrical and mechanical parameters. The parameters can be estimated during the machine's operation in closed-loop by recursive algorithms. On-line estimation algorithms can yield suitable results when parameter identifiability is guaranteed. This work analyzes the identifiability of the induction machine by the condition of sufficient...
GaN-based alloys are characterized by important spatial composition inhomogeneities resulting from the random distribution of Indium atoms. These variations can induce carrier localization and strongly influence the performance of the devices. We present here a work based on the recent theory of the localization landscape, whose main result is the derivation of an effective potential W. The basins...
In this paper, a neurodynamic optimization approach is proposed for robust pole assignment of fractional-order control systems. Compared with integral-order systems, the pole assignment of fractional-order systems is more challenging due to variability of stability region. The robust pole assignment is formulated as a constrained optimization problem, and a robustness measure is derived as a pseudoconvex...
A ship in open sea is a very complex dynamic system. It is affected by three types of perturbations: hydrodynamic perturbations induced by the ship movements, external perturbations produced by wind, waves, and sea currents, and those produced by the control systems of the ship, like propulsion and steering systems. The external perturbations, especially the waves, are the most important, because...
This paper is devoted to design an optimal linear quadratic controller for a time-varying system of coupled parabolic and hyperbolic partial differential equations (PDEs). Infinite-dimensional state space approach is adopted to solve the control problem via the well-known operator Riccati equation. The latter is converted into a scalar partial differential equation coupled with a set of ordinary differential...
In this work, we establish characteristic roots of a linear scalar delay system with multiple discrete lags based on its Laplace transform. The computation of all eigenvalues relays on the Lambert W function. Our result shows that the number of eigenvalues located inside each branches (except for the principal branch) of the Lambert W function is the same as the total number of discrete delays. Once...
Adaptive structures are engineering structures with the ability to modify their response to external loads. This includes active damping of externally induced vibrations. The controller design is usually based on reduced order models that comprise the most important vibration modes of the structure. This can lead to unwanted excitation of the neglected modes, known as control spillover. One means...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.