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Xinghua Zhang,Yantao Wang,Xiaofei Fan 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
In this paper, the stability analysis problem of linear systems with an interval time-varying delay is investigated. Firstly, an augmented Lyapunov-Krasovskii functional is constructed, which includes more informationof the delay’s range and the delay’s derivative. Secondly, based on two improved integral inequalities which are lessconservative than Jensen’s integral inequalities, a delay-range-partition (DRP) approach is proposed to estimate theupper bound of the derivative of the augmented Lyapunov-Krasovskii functional. Then, less conservative stabilitycriteria in the form of linear matrix inequality (LMI) are established no matter whether the lower bound of delayis zero or not. Finally, to illustrate the effectiveness of the stability criteria proposed in this paper, two numericalexamples are given, and their results are compared with the existing results.
State Observer for Delay-coupled Genetic Regulatory Networks with Two Central Modes
Minde Yan,Xian Zhang,Yantao Wang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.12
This article designs the state observer of the delay-coupled genetic regulation network with two central modes. The coupling network consists of two central hubs which directly promote or inhibit each other. The state of system is estimated via the measurement output. A Lyapunov–Krasovskii functional related to the structural characteristics of the genetic regulatory network is constructed to investigate the delay-dependent asymptotic stability criterion of the error system. The linear matrix inequality-based stability condition is first given. Then, the state observer of the studied network model is designed. An explainable example is demonstrated to verify the applicability of state observer of the delay-coupled genetic regulation network with two central modes.
Yufeng Lian,Xiaoyu Wang,Yantao Tian,Keping Liu 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.2
This paper presents a new control scheme for lateral collision avoidance (CA) systems to improve the safety of four-in-wheel-motor-driven electric vehicles (FIWMD-EVs). There are two major contributions in the design of lateral CA systems. The first contribution is a new lane-changing model based on vehicle edge turning trajectory (VETT) to make vehicle adapt to different driving roads and conform to drivers’ characteristic, in addition to ensure vehicle steering safety. The second contribution is vehicle semi-uncertainty dynamic model (SUDM), which is SISO model. The problem of stability performance without the information on sideslip angle is solved by the proposed SUDM. Based on the proposed VETT and SUDM, the lateral CA system can be designed with robust controller to restrain the effect of uncertainties resulting from parameter perturbation and lateral wind disturbance. Single and mixed driving cycles simulation experiments are carried out with CarSim to demonstrate the effectiveness in control scheme, simplicity in structure for lateral CA system based on the proposed VETT and SUDM.
Xian Zhang,Xiaofei Fan,Yu Xue,Yantao Wang,Wei Cai 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
This paper is concerned with the problem of the robust exponential passive filter design for uncertainneutral-type neural networks with time-varying mixed delays. Our aim is to design a Luenberger-type filter forestimating information about the neuron states, which is required in some applied areas. By constructing an appropriateLyapunov-Krasovskii functional and using the Wirtinger-based integral inequality to estimate its derivative,a delay-range-dependent and delay-rate-dependent criterion is presented to ensure the augmented filtering dynamicsystem to be robustly exponentially stable and passive with an expected dissipation. Since the criterion is presentedin the form of linear matrix inequalities with nonlinear constraints, a cone complementarity linearization algorithmis proposed to determine the filter gain from solution to the nonlinear problem. Finally, a numerical example isgiven to demonstrate the effectiveness of the proposed method.
A novel scheme to acquire enhanced up-conversion emissions of Ho3+ and Yb3+ co-doped Sc2O3
Chaoyi Zhang,Qian Jiang,Xinyu Wang,Jing Liu,Yantao Xiao,Chun Li,Hai Lin,Fanming Zeng,Zhongmin Su 한국물리학회 2020 Current Applied Physics Vol.20 No.1
A detailed investigation about the effect of Sc2O3: 1 mol%Ho3+/5 mol%Yb3+ co-doped with Ce4+ ions prepared by sol-gel methods was performed systematically. Under the excitation of 980 nm laser diode, both green emission (553 nm, 5F4/5S2→5I8) and red emission (672 nm, 5F5→5I8) were both observed in the emission spectra of the samples, which were found to be two-photon process and sensitized by Yb3+ ions. With the increasing of Ce4+ ions, the up-conversion green emission intensity are increased by 6.52, 8.69, 10.85, 13.92 and 16.66 fold, corresponding to the Ce4+ ions concentrations from 5 mol% to 13 mol%, respectively. The number of photons are necessary to populate the upper emitting state decreases to 2 and the infrared absorption coefficient is reduced, when the Ce4+ ions concentration increase to 13 mol%. Ce4+ ions play an important role in tailoring the local crystal field around Ho3+ ions, lowering the highest phonon cut-off energy of matrix and reducing the infrared absorption coefficient, thus hindering the non-radiative processes, which contribute to the increased emission intensity. The excellent enhancement makes it a promising multifunctional optical luminescence material.
ADAPTIVE SLIDING MODE CONTROL OF LATERAL STABILITY OF FOUR WHEEL HUB ELECTRIC VEHICLES
Shou-Tao Li,Hui Liu,Di Zhao,Qiu-Yuan Li,Yantao Tian,De-Jun Wang,Ding-Li Yu 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.3
Some physical parameters of a hub motor-driven four-wheel electric vehicle will change when the vehicle turns or maneuvers and the parameter change is caused by the change of the driving conditions. An adaptive sliding mode control is proposed in this paper to maintain the vehicle’s stability by compensating for the change of these parameters. The control parameter being adapted is the converging rate of the system state towards the sliding mode. As the Lyapunov method is used, so both the vehicle stability and adaptive rate convergence are guaranteed. Moreover, the hierarchical control structure is adopted for this vehicle stability control system. The above adaptive sliding model control forms the upper-layer; while the lower-layer control is to distribute the upper torque to the four wheels in an optimal way, subject to several constraints. In addition, the best feasible reference of the yaw rate and the vehicle side slip angle are obtained and used in the control system. The developed method is simulated under the CarSim/MATLAB co-simulation environment to evaluate the system performance. The simulation results are compared with the non-adaptive existing sliding mode control, and show that the proposed method is superior under different conditions.
Chen, Lei,Zhang, Fan,Deng, Xin-Yu,Xue, Xiangxin,Wang, Li,Sun, Yantao,Feng, Jing-Dong,Zhang, Yongjun,Wang, Yaxin,Jung, Young Mee Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.189 No.-
<P><B>Abstract</B></P> <P>A plasmon induced carrier movement enhanced mechanism of surface-enhanced Raman scattering (SERS) was investigated using a charge-transfer (CT) enhancement mechanism. Here, we designed a strategy to study SERS in Au@Cu<SUB>2</SUB>O nanoshell nanoparticles with different shell thicknesses. Among the plasmonically coupled nanostructures, Au spheres with Cu<SUB>2</SUB>O shells have been of special interest due to their ultrastrong electromagnetic fields and controllable carrier transfer properties, which are useful for SERS. Au@Cu<SUB>2</SUB>O nanoshell nanoparticles (NPs) with shell thicknesses of 48–56nm are synthesized that exhibit high SERS activity. This high activity originates from plasmonic-induced carrier transfer from Au@Cu<SUB>2</SUB>O to 4-mercaptobenzoic acid (MBA). The CT transition from the valence band (VB) of Cu<SUB>2</SUB>O to the second excited π-π* transition of MBA, and is of b<SUB>2</SUB> electronic symmetry, which was enhanced significantly. The Herzberg-Teller selection rules were employed to predict the observed enhanced b<SUB>2</SUB> symmetry modes. The system constructed in this study combines the long-range electromagnetic effect of Au NPs, localized surface plasmon resonance (LSPR) of the Au@Cu<SUB>2</SUB>O nanoshell, and the CT contribution to assist in understanding the SERS mechanism based on LSPR-induced carrier movement in metal/semiconductor nanocomposites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We designed a shell-dependent Au@Cu<SUB>2</SUB>O nanoshell for SERS study. </LI> <LI> SERS contribution enables us to understand the possible enhancement of hybrid nanostructures. </LI> <LI> LSPR-induced carrier movement in Au@Cu<SUB>2</SUB>O nanocomposites. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>We designed the shell-dependent Au@Cu<SUB>2</SUB>O core-shell nanoparticles (NPs) for SERS study. For the electron-hole pairs in the Cu<SUB>2</SUB>O, the plasmon induced resonant energy transfer from Au to the Cu<SUB>2</SUB>O and the direct electron transfer simultaneously which can be observed from the SERS intensity.</P> <P>[DISPLAY OMISSION]</P>