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Terminal sliding mode control of master-slave system with Markovian jump parameters
Xinghua Liu,Guoqi Ma,Hongsheng Xi,Weidong Wang 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The finite-time synchronization of master-slave system with Markovian jump parameters is investigated in this paper. An equivalent control based terminal sliding mode control is proposed to guarantee the finite-time convergence of error dynamics. By using stochastic theory and Lyapunov method, some conditions are proposed to facilitate the sliding surface design. Furthermore, a desired controller is synthesized to ensure that the trajectory of the closed-loop error system can be driven onto the prescribed sliding mode surface. Finally numerical simulations are presented to illustrate the effectiveness of terminal sliding mode control scheme.
Research and Implementation of U-Learning System Based on Experience API
Xinghua Sun,Yongfei Ye,Jie Yang,Li Hao,Lihua Ding,Haomin Song 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.3
Experience API provides a learner-centered model for learning data collection and learning process recording. In particular, it can record learning data from multiple data sources. Therefore, Experience API provides verygood support for ubiquitous learning. In this paper, we put forward the architecture of ubiquitous learningsystem and the method of reading the learning record from the ubiquitous learning system. We analyze students’learning behavior from two aspects: horizontal and vertical, and give the analysis results. The system canprovide personalized suggestions for learners according to the results of learning analysis. According to thefeedback from learners, we can see that this u-learning system can greatly improve learning interest and qualityof learners.
An Engine for Automatic Code Generation of Security Protocols in Multiple Languages
Xinghua Li,Xiang Lu,Jianfeng Ma 한국산학기술학회 2013 SmartCR Vol.3 No.3
Security protocols are a critical component to secure systems with appropriate cryptographic methods. Nevertheless, the protocol implementation lacks efficient system practices, as well as practical methods to guarantee conformance between the design and its realization. Motivated by this problem, we set out to generate security protocol code automatically, with an implementation guaranteed to conform to its design. To this end, we implemented a code generation engine that we named EACG. This engine leverages eXtensible Markup Language to describe designed security protocols in an unambiguous manner. Taking the description as input, the designed compiler can automatically convert a protocol to its code implementations in multiple languages with the aid of an underlying support module. Our analysis indicates that EACG automatically generates valid, conformable implementation code for a security protocol. Also, it shows salient advantages compared to current code generation schemes with multi-language support, universality, and ease of use.
Xinghua Liu,Hong-sheng Xi 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.1
The exponential stability for neutral delay Markovian jump systems with nonlinear perturbations and partially unknown transition rates is investigated in this paper. With creative Lyapunov functional and novel matrix inequalities analysis, delay-range-dependent and rate-dependent exponential stability conditions are presented by reciprocally convex lemma and free weighting matrices. Numerical exam-ples are given to demonstrate the effectiveness of the proposed methods.
Xinghua Liu,Hong-sheng Xi 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.6
This paper is concerned with the synchronization problem for a class of Markovian jump complex heterogeneous networks with partly unknown transition rates and time-varying delay. Based on the concept of quasi-synchronization, a novel stochastic Lyapunov functional is constructed to solve the problem. Then sufficient quasi-synchronization conditions are presented, and explicit expressions of error levels are proposed to estimate the synchronization error. Finally, numerical examples are provided to demonstrate the feasibility and effectiveness of the proposed theoretic result.
Xinghua Gao,Beihai Zhou,Rongfang Yuan 대한환경공학회 2015 Environmental Engineering Research Vol.20 No.4
The effects of ion-doping on TiO₂ nanotubes were investigated to obtain the optimal catalyst for the effective decomposition of Rhodamine B (RB) through UV photocatalytic oxidation process. Changing the calcination temperature, which changed the weight fractions of the anatase phase, the average crystallite sizes, the BET surface area, and the energy band gap of the catalyst, affected the photocatalytic activity of the catalyst. The ionic radius, valence state, and configuration of the dopant also affected the photocatalytic activity. The photocatalytic activities of the catalysts on RB removal increased when Ag(+), Al<sup><sup>3+</sup></sup> and Zn<sup>2+</sup> were doped into the TiO₂ nanotubes, whereas such activities decreased as a result of Mn<sup>2+</sup> or Ni<sup>2+</sup> doping. In the presence of Zn<sup>2+</sup>-doped TiO₂ nanotubes calcined at 550℃, the removal efficiency of RB within 50 min was 98.7%.
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.