Jinzhou, China
Jinzhou, China

Bohai University established in 1950, is a university in Jinzhou, Liaoning province, northeast China. Wikipedia.

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Wang J.,Bohai University
Systems and Control Letters | Year: 2017

This paper considers continuous linear systems involving input saturations and quantized control laws. Based on spherical polar coordinates, a quantizer of infinite data rate is proposed with a definite relation between the quantized data and the corresponding quantization error. By the proposed quantizer, state feedback controllers are designed for input quantization case and state quantization case, respectively, to achieve both local asymptotic stability and larger stability regions of the systems. Further, a quantizer of finite data rate is proposed for the same problem. © 2017

Lam H.K.,King's College London | Li H.,Bohai University
IEEE Transactions on Industrial Electronics | Year: 2013

This paper presents the output-feedback tracking control of the polynomial fuzzy-model-based control system which consists of a polynomial fuzzy model representing the nonlinear plant and an output-feedback polynomial fuzzy controller connected in a closed loop. The output-feedback polynomial fuzzy controller is employed to drive the system states of the nonlinear plant to follow those of a stable reference model subject to an H∞ performance. Based on the Lyapunov stability theory, sum-of-squares-based stability conditions are obtained to determine the system stability and facilitate the control synthesis. A feasible solution can be found numerically using the third-party Matlab toolbox SOSTOOLS. Simulation results are provided to demonstrate the merits of the proposed control approach. © 1982-2012 IEEE.

Li H.,Bohai University | Jing X.,Hong Kong Polytechnic University | Karimi H.R.,University of Agder
IEEE Transactions on Industrial Electronics | Year: 2014

This paper deals with the problem of output-feedback H∞ control for a class of active quarter-car suspension systems with control delay. The dynamic system of the suspension systems is first formed in terms of the control objectives, i.e., ride comfort, road holding, suspension deflection, and maximum actuator control force. Then, the objective is to the design of the dynamic output-feedback H∞ controller in order to ensure asymptotic stability of the closed-loop system with H∞ disturbance attenuation level and the output constraints. Furthermore, using Lyapnov theory and linear matrix inequality (LMI) approach, the existence of admissible controllers is formulated in terms of LMIs. With these satisfied conditions, a desired dynamic output-feedback controller can be readily constructed. Finally, a quarter-vehicle model is exploited to demonstrate the effectiveness of the proposed method. © 1982-2012 IEEE.

Wu J.-P.,Bohai University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

We investigate the low energy behaviors around the Fermi surface at the non-relativistic fixed points and give some clear and direct numerical results on the structure of the Fermi surface in the presence of a holographic flat band. Compared with the case of the dual relativistic fermionic system, the Fermi momentum is suppressed by the presence of the holographic flat band. In particular, we give an analytical understanding of the low energy behaviors of the dual non-relativistic fermionic system. One finds that due to AdS2×R2 background geometry in the near horizon limit, the scaling behaviors of the spectral function at the non-relativistic fixed points is as same as that at the relativistic fixed points, which controlled by the IR Green's function GI(k,ω). As a check, we also give a comparison about the scaling exponents δ of the dispersion relation between the numerical and analytical results. One finds that the numerical result is agree well with the analytical that. © 2013 Elsevier B.V.

Wu J.-P.,Bohai University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We study the fermionic response including the bulk dipole coupling on the charged Lifshitz black brane from Einstein-Dilaton-Maxwell model. For fixed Lifshitz dynamical critical exponent z, by tuning the dipole coupling parameter p, we can realize the phase transitions from Fermi liquid, to marginal Fermi liquid, to non-Fermi liquid and finally to Mott insulator. The Lifshitz dynamical critical exponent z plays the role of making the phase transition point from Fermi liquid to non-Fermi liquid or to Mott insulator decrease with the increase of z for fixed dipole coupling p. © 2013 The Author.

Tang L.,Bohai University | Cai M.,Bohai University
Sensors and Actuators, B: Chemical | Year: 2012

A new benzimidazole-based imine linked sensor (1) was synthesized. Sensor 1 exhibits highly selective and sensitive recognition properties to Cu 2+ in CH 3OH/H 2O (1/1, v/v, HEPES 10 mM, pH = 7.0) solution with a 1:1 binding stoichiometry. The in situ prepared 1-Cu 2+ complex solution displays high selectivity to cyanide through Cu 2+ displacement approach and possesses excellent tolerance to other common interference anions. The detection limits of sensor 1 to Cu 2+ and 1-Cu 2+ complex to cyanide were estimated to be 1.82 × 10 -8 M and 1.62 × 10 -6 M, respectively. This Cu 2+ and cyanide successive recognition feature of sensor 1 makes it a potential utility for Cu 2+ and cyanide detection in aqueous media. © 2012 Elsevier B.V.

Zeng H.B.,Bohai University | Wu J.-P.,Bohai University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

A holographic superconductor is constructed in the background of a massive gravity theory. In the normal state without condensation, the conductivity exhibits a Drude peak that approaches a delta function in the massless gravity limit as studied by David Vegh. In the superconducting state, besides the infinite dc conductivity, the ac conductivity has Drude behavior at low frequency followed by a power-law fall. These results are in agreement with that found earlier by Horowitz and Santos, who studied a holographic superconductor with an implicit periodic potential beyond the probe limit. The results also agree with measurements on some cuprates. © 2014 American Physical Society.

Li X.,Harbin Institute of Technology | Gao H.,Bohai University
Automatica | Year: 2013

This paper is concerned with the problem of robust finite frequency (FF) H∞ filtering for uncertain twodimensional (2-D) discrete-time systems in the Fornasini-Marchesini local state-space (FM LSS) model with polytopic uncertain parameters. The goal of the paper is to design filters such that the FF H∞ norm of the filtering error system has a specified upper bound for all uncertainties. In light of a recently developed generalized bounded real lemma, a linear matrix inequality-based approach is proposed for robust FF H∞ filter analysis and design. It is demonstrated that the presented approach to robust FF H∞ filter design covers the latest standard H∞ filtering result. Moreover, it is shown that the existing results specialized for the Roesser model, when applied to the FM LSS model through a model transformation, are much more restrictive than the proposed results in the paper, further justifying this work. © 2013 Elsevier Ltd. All rights reserved.

Yin S.,Bohai University | Yin S.,Harbin Institute of Technology | Luo H.,University of Duisburg - Essen | Ding S.X.,University of Duisburg - Essen
IEEE Transactions on Industrial Electronics | Year: 2014

In this paper, two online schemes for an integrated design of fault-tolerant control (FTC) systems with application to Tennessee Eastman (TE) benchmark are proposed. Based on the data-driven design of the proposed fault-tolerant architecture whose core is an observer/residual generator based realization of the Youla parameterization of all stabilization controllers, FTC is achieved by an adaptive residual generator for the online identification of the fault diagnosis relevant vectors, and an iterative optimization method for system performance enhancement. The performance and effectiveness of the proposed schemes are demonstrated through the TE benchmark model. © 2013 IEEE.

Chang X.-H.,Bohai University
IEEE Transactions on Fuzzy Systems | Year: 2012

This paper is concerned with the H∞ filtering problem for continuous-time Takagi-Sugeno (T-S) fuzzy systems. Different from existing results for fuzzy H∞ filtering, the proposed ones are toward uncertain fuzzy systems with linear fractional parametric uncertainties. Attention is focused on the design of a fuzzy filter such that the filtering error system preserves a prescribed H∞ performance, where the filter to be designed is assumed to have gain variations. By a descriptor representation approach, two sufficient conditions for the H∞ filter design are proposed in terms of linear matrix inequalities (LMIs). When these LMIs are feasible, an explicit expression of the desired filter is given. A simulation example will be given to show the efficiency of the proposed methods. © 2012 IEEE.

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