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Sun Y.-G.,Huainan Normal University | Qin S.-Y.,Beihang University
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2011

In this paper, the stability and stabilization problems of a class of networked control systems (NCSs) with bounded packet dropout are investigated. An iterative approach is proposed to model the NCSs with bounded packet dropout as Markovian jump linear systems (MJLSs). The transition prob- abilities of MJLSs are partly unknown due to the complexity of network. The system under consideration is more general, which covers the systems with completely known and completely unknown transition probabilities as two spacial cases. Moreover, both sensor-to-controller and controller-to-actuator packet dropouts are considered simultaneously. Sufficient conditions for stochastic stability and stabilization of the underlying systems are derived via linear matrix inequalities (LMIs) formulation. Lastly, two illustrative examples are given to demonstrate the effectiveness of the proposed results. © 2011 Acta Automatica sinica. All rights reserved.


Liu H.,Huainan Normal University | Zhao H.,Southwest Jiaotong University
Journal of Computational Information Systems | Year: 2012

This paper investigates the control problem of the uncertain and perturbed nonlinear systems by means of H ∞ adaptive fuzzy sliding mode control. The underlying parameter adaptation design as well as stability analysis are carried out using Lyapunov based approach. It is shown that the proposed control method can achieve a certain robust tracking performance and attenuate the effect of the disturbances to a prescribed level. Numerical simulations are presented to show the effectiveness of the proposed method. © 2012 Binary Information Press.


Ji Q.,Huainan Normal University | Lu Y.,Harbin Engineering University
International Journal of Bifurcation and Chaos | Year: 2013

Oscillatory patterns in a one-pool model with Ca2+-activated IP3 degradation are presented and classified, based on fast/slow dynamical analysis and two-parameter bifurcations. The whole parameter space can be partitioned into two parts, that is, the oscillatory and rest regions. For this purpose, we perform the continuation of fold bifurcation, Hopf bifurcation and saddle-node bifurcation of limit cycles, respectively. Several distinct topological types of complex intracellular Ca2+ oscillations (especially bursting) are investigated in the oscillatory area. The classification and transition of different types of Ca2+ oscillations may offer a possible explanation for the differences in dynamic behavior observed in real cells in response to different levels of stimulation. © 2013 World Scientific Publishing Company.


Five radical-Ln(III)-radical complexes, [Ln(hfac) 3(NITPhOC 4H 9) 2] (Ln = Gd (1), Tb (2), Dy (3), Ho (4), Er (5); hfac = hexafluoroacetylacetonate; and NITPhOC 4H 9 = 4′-butoxy-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized, structurally and magnetically characterized. The X-ray crystal structure analysis reveals that the structures of the five complexes are isomorphous in which central Ln(III) ions are coordinated by six oxygen atoms from three hfac and two oxygen atoms from nitronyl radicals. The magnetic studies show that in the Gd(III) complex, there are ferromagnetic Gd(III)-Rad interactions and antiferro-magnetic Rad-Rad interactions in the molecules (with J Rad-Gd = 0.19 cm -1, J Rad-Gd = -1.91 cm -1). And the analogous complex of [Tb(hfac) 3(NITPhOC 4H 9) 2] (2) shows the strong ferromagnetic Tb(III)-Rad interactions. © 2012 Elsevier B.V. All rights reserved.


Sun Y.,Huainan Normal University
International Journal of Systems Science | Year: 2014

In this paper, the finite-time boundedness and stabilisation problems of a class of networked control systems (NCSs) with bounded packet dropout are investigated. The main results provided in the paper are sufficient conditions for finite-time boundedness and stability via state feedback. An iterative approach is proposed to model NCSs with bounded packet dropout as jump linear systems (JLSs). Based on Lyapunov stability theory and JLSs theory, the sufficient conditions for finite-time boundedness and stabilisation of the underlying systems are derived via linear matrix inequalities (LMIs) formulation. Moreover, both sensor-to-controller and controller-to-actuator packet dropouts are considered simultaneously. Lastly, an illustrative example is given to demonstrate the effectiveness of the proposed results. © 2013 © 2013 Taylor & Francis.


Li G.,Huainan Normal University
Chinese Control Conference, CCC | Year: 2016

The synchronization of uncertain chaotic neural networks with time delays was studied in this paper. Based on the sliding mode control (SMC) approach, some sufficient conditions for synchronization of the two coupled networks are obtained. Finally, an example and its simulation are given to illustrate the effectiveness of our results. © 2016 TCCT.


Wu Z.,Huainan Normal University
Journal of Computational Information Systems | Year: 2013

In this paper, the control problem for an offshore steel jacket platform subject to external disturbances and nonlinear self-excited wave force is concerned by using sliding mode control methods. A sliding mode controller with robust terms is proposed to reduce the oscillation amplitudes of the offshore platform. The robust terms are used to handle the system uncertainties. Throughout the simulation results we can find that the control approach this paper proposed is valid for offshore platform. Copyright © 2013 Binary Information Press.


Liu Y.,Huainan Normal University | Liao X.,Huainan Normal University
Expert Systems with Applications | Year: 2011

For the subjectivity of lifting wavelet coefficients selection, an adaptive noise reduction method is proposed for chaotic signals corrupted by nonstationary noises. Here, wavelet coefficients including coarse approximation and detail information are obtained by dual-lifting wavelet transform. The coarse parts are handled by the singular spectrum analysis, whereas the detail parts are analyzed combining with gradient decent algorithm in neural networks for the adaptive choice of wavelet coefficients. The chaotic signals generated by Lorenz model as well as the observed monthly series of sunspots are respectively applied for simulation analysis. The experimental results show a dramatic improvement of the proposed method, the advantages of which include the simple of achieving, the small reconstruction error and the efficiency for the noisy chaotic signals. © 2010 Elsevier Ltd. All rights reserved.


A dynamic tonometry device includes a probe, a housing, a sleeve, a light source, an image sensor, a pressure sensor, a microprocessor and a display storage. The probe is a truncated cone with small at left and large at right. The sleeve is fitted on the probe. An end face of a small end of the probe is situated to a left of a left end face of the sleeve. A right end of the sleeve is connected to a left end of the housing; on a large end of the probe is installed the pressure sensor; inside the housing are installed the light source and the image sensor. Light emitted by the light source is collimated into a light beam which is incident to the probe and totally reflected before entering the image sensor. With the microprocessor are connected the pressure sensor, the image sensor and the display storage.


Four radical-Ln(III)-radical complexes, [Ln(hfac) 3(NITPhSCH 3) 2] (Ln=Gd (1), Dy (2), Er (3), Ho (4); hfac=hexafluoroacetylacetonate; NITPhSCH 3=4′-thiomethylphenyl- 4,4,5,5tetramethyl-imidazoline-1-oxyl-3-oxide), have been synthesized, and structurally and magnetically characterized. The X-ray crystal structures show that the structures of the four complexes are similar, consisting of isolated molecules in which Ln(III) ions are coordinated by six oxygen atoms from three hfac and two oxygen atoms from nitronyl radicals. The temperature dependencies of magnetic susceptibilities for the four complexes show that in the Gd(III) complex, ferromagnetic interactions between Gd(III)-radical and antiferromagnetic interactions between the radicals coexist with J Rad-Gd=1.09 cm -1, J Rad-Rad=-1.85 cm -1. © 2011 Taylor & Francis.

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