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| 1 | Adaptive event-triggered control for a class of nonlinear systems with periodic disturbances显示文摘This paper investigates the adaptive event-triggered control problem for a class of nonlinear systems subject to periodic disturbances. To reduce the communication burden, a reliable relative threshold strategy is proposed. Fourier series expansion and radial basis function neural network are combined into a function approximator to model suitable time-varying disturbed function of known periods in strict-feedback systems. By combining the Lyapunov stability theory and the backstepping technique, the proposed adaptive control approach ensures that all the signals in the closed-loop system are bounded, and the tracking error can be regulated to a compact set around zero in finite time. Finally, simulation results are presented to verify the effectiveness of the theoretical results. | Hui MA Hongyi LI Renquan LU Tingwen HUANG | 2020 | Science China(Information Sciences)2020，63，5： | 14 |
| 2 | Observer-based adaptive consensus control for nonlinear multi-agent systems with time-delay显示文摘In this paper, we consider the observer-based adaptive consensus tracking problem for a class of nonlinear time-delay multi-agent systems in the presence of input saturation. Under the assumption that the communication topology is directed and connected, a distributed adaptive consensus controller is developed based on the dynamic surface control technique. By constructing the nonlinear observer, the unmeasurable agents dynamics can be estimated. Input saturation problem is solved by a smooth function combined with an auxiliary variable. With the help of prescribed performance functions, the synchronization errors converge to the prescribed sets, which are characterized as a neighborhood of zero. According to Lyapunov stability theory, it is shown that with the proposed distributed consensus tracking approach, the consensus errors are cooperatively semi-globally uniformly ultimately bounded. Finally, a simulation example is provided to show the effectiveness of the proposed algorithm. | Wenbin XIAO Liang CAO Hongyi LI Renquan LU | 2020 | Science China(Information Sciences)2020，63，3： | 10 |
| 3 | Distribution of IgG galactosylation as a promising biomarker for cancer screening in multiple cancer types显示文摘 | Shifang Ren Zejian Zhang Congjian Xu Lin Guo Renquan Lu Yihong Sun Jianming Guo Ruihuan Qin Wenjun Qin Jianxin Gu | 2016 | Cell Research2016，26，8： | 8 |
| 4 | An Overview of Finite/Fixed-Time Control and Its Application in Engineering Systems显示文摘The finite/fixed-time stabilization and tracking control is currently a hot field in various systems since the faster convergence can be obtained. By contrast to the asymptotic stability,the finite-time stability possesses the better control performance and disturbance rejection property. Different from the finite-time stability, the fixed-time stability has a faster convergence speed and the upper bound of the settling time can be estimated. Moreover, the convergent time does not rely on the initial information.This work aims at presenting an overview of the finite/fixed-time stabilization and tracking control and its applications in engineering systems. Firstly, several fundamental definitions on the finite/fixed-time stability are recalled. Then, the research results on the finite/fixed-time stabilization and tracking control are reviewed in detail and categorized via diverse input signal structures and engineering applications. Finally, some challenging problems needed to be solved are presented. | Yang Liu Hongyi Li Zongyu Zuo Xiaodi Li Renquan Lu | 2022 | IEEE/CAA Journal of Automatica Sinica2022，9，12： | 6 |
| 5 | Adaptive Attitude Control for Multi-MUAV Systems With Output Dead-Zone and Actuator Fault显示文摘Many mechanical parts of multi-rotor unmanned aerial vehicle(MUAV)can easily produce non-smooth phenomenon and the external disturbance that affects the stability of MUAV.For multi-MUAV attitude systems that experience output dead-zone,external disturbance and actuator fault,a leader-following consensus anti-disturbance and fault-tolerant control(FTC)scheme is proposed in this paper.In the design process,the effect of unknown nonlinearity in multi-MUAV systems is addressed using neural networks(NNs).In order to balance out the effects of external disturbance and actuator fault,a disturbance observer is designed to compensate for the aforementioned negative impacts.The Nussbaum function is used to address the problem of output dead-zone.The designed fault-tolerant controller guarantees that the output signals of all followers and leader are synchronized by the backstepping technique.Finally,the effectiveness of the control scheme is verified by simulation experiments. | Guowei Dong Liang Cao Deyin Yao Hongyi Li Renquan Lu | 2021 | IEEE/CAA Journal of Automatica Sinica2021，8，9： | 4 |
| 6 | Human-in-the-Loop Consensus Control for Nonlinear Multi-Agent Systems With Actuator Faults显示文摘This paper considers the human-in-the-loop leader-following consensus control problem of multi-agent systems(MASs)with unknown matched nonlinear functions and actuator faults.It is assumed that a human operator controls the MASs via sending the command signal to a non-autonomous leader which generates the desired trajectory.Moreover,the leader’s input is nonzero and not available to all followers.By using neural networks and fault estimators to approximate unknown nonlinear dynamics and identify the actuator faults,respectively,the neighborhood observer-based neural fault-tolerant controller with dynamic coupling gains is designed.It is proved that the state of each follower can synchronize with the leader’s state under a directed graph and all signals in the closed-loop system are guaranteed to be cooperatively uniformly ultimately bounded.Finally,simulation results are presented for verifying the effectiveness of the proposed control method. | Guohuai Lin Hongyi Li Hui Ma Deyin Yao Renquan Lu | 2022 | IEEE/CAA Journal of Automatica Sinica2022，9，1： | 3 |
| 7 | Egg white-mediated green synthesis of silver nanoparticles with excellent biocompatibility and enhanced radiation effects on cancer cells显示文摘 | Renquan Lu | 2012 | International Journal of Nanomedicine (default)2012，，： | 1 |
| 8 | De- lay-dependant robust stability and stabilization con- ditions for a class of lurte singular time-delay sys- tems 显示文摘 | Lu Renquan Dai Xiaozhen Su Hongye | 2008 | Asian Journal of Control2008，10，4： | 1 |
| 9 | H∞ filtering for singular systems with communication delays 显示文摘 | LU Renquan XU Yong XUE Anke | 2010 | Signal Processing2010，16，4： | 1 |
| 10 | Distributed Event-Triggered Formation Control of USVs with Prescribed Performance显示文摘In this paper,the formation control problem is investigated for a team of uncertain underactuated surface vessels(USVs)based on a directed graph.Considering the risk of collision and the limited communication range of USVs,the prescribed performance control(PPC)methodology is employed to ensure collision avoidance and connectivity maintenance.An event-triggered mechanism is designed to reasonably use the limited communication resources.Moreover,neural networks(NNs)and an auxiliary variable are constructed to deal with the problems of uncertain nonlinearities and underactuation,respectively.Then,an event-triggered formation control scheme is proposed to ensure that all signals of the closed-loop system are uniformly ultimately bounded(UUB).Finally,simulation results are presented to demonstrate the effectiveness of the proposed control scheme. | CHEN Guangdeng YAO Deyin ZHOU Qi LI Hongyi LU Renquan | 2022 | Journal of Systems Science & Complexity2022，35，3： | 1 |
| 11 | Distributed event triggering control for six-rotor UAV systems with asymmetric time-varying output constraints显示文摘Inspired by the practical operability and safety of unmanned aerial vehicles(UAVs)in confined areas,this paper investigates adaptive trajectory tracking control problems in multiple six-rotor UAV systems with asymmetric time-varying output constraints and input saturation.Under model and disturbance uncertainties,six-rotor UAV systems are modeled as two non-strict-feedback systems,including attitude(inner-loop)and position(outer-loop)regulation systems.For the inner-loop design,the neural-based distributed adaptive attitude consensus control protocol is employed to realize the leader-follower consensus.Adaptive first-order sliding mode differentiators and an auxiliary dynamic system are introduced to address the“explosion of complexity”and saturation nonlinearity issues,respectively.Then,an event-triggered condition is predefined to alleviate the communication loads and reduce the number of messages to be transmitted from the controller to actuator.In addition,a class of asymmetric time-varying barrier Lyapunov functions are constructed for preventing the violation of time-varying output constraints.Accordingly,the proposed double-loop control strategies guarantee that all signals of UAV systems are semi-globally and uniformly bounded.Simulation results demonstrate that the proposed control method is effective. | Liang CAO Hongru REN Wei MENG Hongyi LI Renquan LU | 2021 | Science China(Information Sciences)2021，64，7： | 1 |
| 12 | Event-Triggered Adaptive Neural Control for Multiagent Systems with Deferred State Constraints显示文摘This paper focuses on the leader-following consensus control problem for nonlinear multiagent systems subject to deferred asymmetric time-varying state constraints.A distributed eventtriggered adaptive neural control approach is advanced.By virtue of a distributed sliding-mode estimator,the leader-following consensus control problem is converted into multiple simplified tracking control problems.Afterwards,a shifting function is utilized to transform the error variables such that the initial tracking condition can be totally unknown and the state constraints can be imposed at a specified time instant.Meanwhile,the deferred asymmetric time-varying full state constraints are addressed by a class of asymmetric barrier Lyapunov function.In order to reduce the burden of communication,a relative threshold event-triggered mechanism is incorporated into controller and Zeno behavior is excluded.Based on Lyapunov stability theorem,all closed-loop signals are proved to be semi-globally uniformly ultimately bounded.Finally,a practical simulation example is given to verify the presented control scheme. | YANG Bin CAO Liang XIAO Wenbin YAO Deyin LU Renquan | 2022 | Journal of Systems Science & Complexity2022，35，3： | 1 |
| 13 | Networked hinfinity filtering for T-S fuzzy systems with quantization and data dropouts显示文摘 | Lu Renquan Wu Haiyi Bai Jianjun | 2014 | Journal of the Franklin Institute-Engineering and Applied Mathematics2014，351，6： | 1 |
| 14 | On robustly expo- nential stability of uneertain neutral systems with time-var- ying delays and nonlinear perturbations显示文摘 | Chen Yun Xue Anke Lu Renquan | 2008 | Nonlinear A- nalysis2008，68，： | 1 |
| 15 | Predictive control optimization based PID control for temperature in an industrial surfactant reactor显示文摘 | Ridong Zhang Sheng Wu Renquan Lu Furong Gao | 2014 | Chemometrics and Intelligent Laboratory Systems2014，，： | 1 |
| 16 | On ro- bustly exponential stability of uncertain neutral sys- tems with time-varying delays and nonlinear perturba- tions显示文摘 | CHEN Yun XUE Anke LU Renquan | 2008 | Nonlinear Analysis2008，68，8： | 1 |
| 17 | A disturbance observer based intelligent control for nonstrict-feedback nonlinear systems显示文摘Focusing on one class of nonlinear systems with input saturation,the adaptive fuzzy dynamic event-triggered control problem is successfully solved.A dynamic event-triggered mechanism is adopted to save the communication burden of the system,and is integrated into the controller design process based on the backstepping technique.For handling the asymmetric input saturation,an auxiliary system with the same order as the considered system is constructed.Analysis problems caused by unknown continuous functions are efficiently tackled by applying the approximation theory of fuzzy logic systems.It is proven that all the signals of the resulting closed-loop system are bounded via Lyapunov stability analysis.Both numerical and practical simulations are presented to demonstrate the effectiveness of the theoretical results. | REN HongRu MA Hui LI HongYi LU RenQuan | 2023 | Science China(Technological Sciences)2023，66，2： | 0 |
| 18 | Targeting endoplasmic reticulum stress signaling in ovarian cancer therapy显示文摘The endoplasmic reticulum(ER),an organelle present in various eukaryotic cells,is responsible for intracellular protein synthesis,post-translational modification,and folding and transport,as well as the regulation of lipid and steroid metabolism and Ca2+homeostasis.Hypoxia,nutrient deficiency,and a low pH tumor microenvironment lead to the accumulation of misfolded or unfolded proteins in the ER,thus activating ER stress(ERS)and the unfolded protein response,and resulting in either restoration of cellular homeostasis or cell death.ERS plays a crucial role in cancer oncogenesis,progression,and response to therapies.This article reviews current studies relating ERS to ovarian cancer,the most lethal gynecologic malignancy among women globally,and discusses pharmacological agents and possible targets for therapeutic intervention. | Tianqing Yan Xiaolu Ma Lin Guo Renquan Lu | 2023 | Cancer Biology & Medicine2023，20，10： | 0 |
| 19 | Distributed H_(∞)filtering of nonlinear systems with random topology by an event-triggered protocol显示文摘Applying an event-triggered protocol,this paper proposes a distributed H_(∞)filter design for nonlinear perturbed systems under fading measurements with random topology.Nonlinearities in this system obey the one-sided Lipschitz constraint,which embraces the conventional Lipschitz condition as a special case.The sensor network allows random variations of the interconnection strengths between adjacent nodes,and the connection coefficient is determined as the product of a constant and a stochastic variable with a known probabilistic feature.To reduce the unnecessary data transmission and efficiently use the limited bandwidth,the transmissions are orchestrated by an event-triggered regulating strategy.A stochastic bounded real lemma is established for the resulting error dynamics.Based on the presented matrix decomposition,which removes the direct coupling between the statistical information of interconnection strengths and the filter gain,the distributed H_(∞)filter gain can be explicitly expressed and easily solved.The usefulness of the theoretical method is demonstrated in a simulation study. | Yun CHEN Mengze ZHU Renquan LU Anke XUE | 2021 | Science China(Information Sciences)2021，64，10： | 0 |
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