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Neural Regeneration Research 2025年第6期20卷 1715-1716页

作者： dan ma Nona Pop Aston Medical School College of Health and Life SciencesAston UniversityBirminghamUK

Myelin is the protective sheath surrounding nerve fibers, and its damage(demyelination) occurs in many central nervous system(CNS) diseases, including multiple sclerosis(MS), traumatic injury, neurodegenerative diseases such as Alzheimer's disease, and mental disorders such as schizophrenia(Barateiro et al., 2016). Repair of damaged myelin sheaths(remyelination) often fails in MS, leading to neuronal loss and irreversible functional deficits.

关键词： myelin protective diseases

Design of two-layer switching rule for stabilization of switched linear systems with mismatched switching

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Control Theory and Technology 2014年第3期12卷 275-283页

作者： dan ma State Key Laboratory of Synthetical Automation for Process Industries and College of Information Science and EngineeringNortheastern University

A two-layer switching architecture and a two-layer switching rule for stabilization of switched linear control systems are proposed, under which the mismatched switching between switched systems and their candidate hybrid controllers can be allowed. In the low layer, a state-dependent switching rule with a dwell time constraint to exponentially stabilize switched linear systems is given; in the high layer, supervisory conditions on the mismatched switching frequency and the mismatched switching ratio are presented, under which the closed-loop switched system is still exponentially stable in case of the candidate controller switches delay with respect to the subsystems. Different from the traditional switching rule, the two-layer switching architecture and switching rule have robustness, which in some extend permit mismatched switching between switched subsystems and their candidate controllers.

关键词： Two-layer switching rule Mismatched switching Switched linear systems

Adaptive Neural Network Control of Thermoacoustic Instability in Rijke Tube: A Fully Actuated System Approach

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Journal of Systems Science & Complexity 2022年第2期35卷 586-603页

作者： ZHAO Yuzhuo ma dan ma Hongwei State Key Laboratory of Synthetical Automation for Process Industries and College of Information Science and Engineering Northeastern UniversityShenyang 110819China College of Information Science and Engineering Northeastern UniversityShenyang 110819China

Thermoacoustic instability phenomena often encounter in gas turbine combustors,especially for the premixed combustor design,with many possible detrimental *** a classical experiment,the Rijke tube is the simplest and the most effective illustration to study the thermoacoustic *** paper investigates the active control approach of the thermoacoustic instability in a horizontal Rijke ***’s more,the radial basis function(RBF)neural network is adopted to estimate the complex unknown continuous nonlinear heat release rate in the Rijke ***,based on the proposed second-order fully actuated system model,the authors present an adaptive neural network controller to guarantee the flow velocity fluctuation and pressure fluctuation to converge to a small region of the ***,simulation results demonstrate the feasibility of the design method.

关键词： Adaptive neural network control fully actuated system nonlinear system Rijke tube thermoacoustics instability

Real-valued valuations on Sobolev spaces

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Science China mathematics 2016年第5期59卷 921-934页

作者： ma dan Institut für Diskrete mathematik und Geometrie Technische Universitat Wien Wien 1040 Austria

Continuous, SL(n) and translation invariant real-valued valuations on Sobolev spaces are *** centro-affine Hadwiger's theorem is applied. In the homogeneous case, these valuations turn out to be L^p-norms raised to p-... 详细信息

关键词： Sobolev space valuation convex polytope

Reliability and Numerical Analysis of a Robot Safety System

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Journal of Systems Science & Complexity 2019年第4期32卷 1072-1092页

作者： QIAO Xing ma dan College of Automation Harbin Engineering UniversityHarbin 150001China School of mathematical Science Daqing Normal UniversityDaqing 163712China

This paper discusses a model for a repairable robot safety system composed of a safety component and two redundant robots according to a semi-group *** development of the model is divided into three phases:(Ⅰ)The use of pure analysis to prove the uniqueness of a classical solution to the model;(Ⅱ)The verification of this uniqueness by providing a non-negative solution to the model;and(Ⅲ)the formulation of reliability indices for the model,along with numerical examples to explain the *** existence,uniqueness,and exponential stability of the solution of the repairable robot safety system is studied using Volterra-type integral-differential-equation theory,and the spectral distribution of the ACP operator is ***,the authors propose a method to investigate the steady-state indicator of the robot safety system with the safety component working,and with or without the component revolving,to make use of the correspondence of the eigenvector to the eigenvalue *** authors show that the robot’s operation,with or without the safety component revolving and with fractional motion,is superior to that with the safety component *** novelty of the approach lies in its examination of a unique solution to the system and its exponential stability based on C0-semi-group theory,the co-final relative theory,and the functional analysis method.

关键词： Numerical analysis reliability index robot safety system stability

Circle formation control for multi-agent systems with a leader

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Control Theory and Technology 2015年第1期13卷 82-88页

作者： Lianjie ZHAO dan ma College of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

In this paper, we focus on circle formation control of multi-agent systems （maS） with a leader. The circle formation is achieved based on the lead-following and the artificial potential field method. A distributed control law is given to make a group of agents form a circle and consequently achieve an expected angle. Finally, simulation results show that the proposed circle formation strategies are effective.

关键词： Circle formation artificial potential field method multi-agent systems distributed control

Surface effect induced phase transformation by Mn removal during annealing and its textures in cold-rolled high manganese transformation-induced plasticity steel

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Journal of Iron and Steel Research International 2022年第3期29卷 494-502页

作者： Li-ying Liu Ping Yang dan-dan ma Xin-fu Gu School of materials Science and Engineering University of Science and Technology BeijingBeijing100083China

The surface effect induced transformation texture during vacuum annealing of cold-rolled high manganese transformation-induced plasticity(TRIP)steels was *** to Mn removal occurring at the surface layer,γ→δdiffusional phase transformation leads to the formation of hard pancake-shaped ferrite grains due to solution strengthening at the surface and the centre layer remains as austenite+martensite after *** the case of slow heating,{112}/{111}textures for the surface ferrite were strengthened with the increase in temperature and holding time,indicating an inheritance of rolling *** increasing the heating rate of annealing,the rotated cube texture was developed in surface *** kind of multiphase sandwich structure with hard ferrite surface layer and tough austenite dominant centre can increase tensile strength and should also improve deep drawing properties,therefore providing new possibility of controlling properties for the application of high manganese TRIP steel.

关键词： High manganese transformation-induced plasticity steel Surface effect Texture Microstructure Vacuum annealing

Properties of collective Rabi oscillations with two Rydberg atoms

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Chinese Physics B 2019年第1期28卷 340-347页

作者： dan-dan ma Ke-Ye Zhang Jing Qian Quantum Institute for Light and Atoms School of Physics and Material ScienceEast China Normal University

Motivated by experimental advances that the collective excitation of two Rydberg atoms was observed, we provide an elaborate theoretical study for the dynamical behavior of two-atom Rabi oscillations. In the large-intermediate-detuning case, the two-photon Rabi oscillation is found to be significantly affected by the strength of the interatomic van der Waals interaction. With a careful comparison of the exact numbers and values of the oscillation frequency, we propose a new way to determine the strength of excitation blockade, agreeing well with the previous universal criterion for full, partial, and no blockade regions. In the small-intermediate-detuning case, we find a blockade-like effect, but the collective enhancement factor is smaller than ^(1/2) due to the quantum interference of double optical transitions involving the intermediate ***, a fast two-photon Rabi oscillation in ns timescale is manifested by employing intense lasers with an intensity of ~MW/cm^2, offering a possibility of ultrafast control of quantum dynamics with Rydberg atoms.

关键词： Rydberg atoms collective excitation Rabi oscillation excitation blockade

Experimental study on expansion and cracking properties of static cracking agents in different assembly states

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International Journal of Mining Science and Technology 2022年第6期32卷 1259-1272页

作者： Chong Li Sifeng He Wentao Hou dan ma School of Mines China University of Mining and TechnologyXuzhou 221116JiangsuChina MOE Key Laboratory of Deep Coal Resource Mining China University of Mining and TechnologyXuzhou 221116JiangsuChina

Rolled static cracking agent(RSCA)can solve the intractable problem of traditional bulk static cracking agent(BSCA)in engineering *** paper innovatively studies the rational water-cement ratio of BSCA and the immersion soaking time of RSCA under the condition of controlling *** the expansion and cracking performance experiments,the development characteristics of expansion pressure,the cracking effect of the single-hole specimen and the performance of hole spraying prevention under the action of BSCA and RSCA were compared and *** results show that:(1)The volume growth rate of static cracking agent decreases with the increase of water-cement ratio,and the fluidity increases with the increase of water-cement *** rational water-cement ratio for BSCA application is 0.3,and the rational immersion time of RSCA is 2-2.5 min;(2)Under the bore diameters of 30,35,40 and 45 mm,the expansion pressure of BSCA with a water-cement ratio of 0.3 is 38.2,52.3,61.5 and 68 MPa,and the expansion pressure of RSCA immersed in water for 2.5 min is 43.5,58.8,69.5 and 75.1 MPa,*** them,the development speed of expansion pressure of BSCA is higher than that of RSCA,and the arrival time of the peak expansion pressure of RSCA is 1.7 times that of BSCA;(3)The crack initiation speed of single-hole specimen under the action of RSCA is 10.3%lower than that under the action of BSCA,but the cracking speed of the former is 72.6%higher than that of the latter;(4)The hole spraying occurs in BSCA under the bore diameter of 50,55 and 60 mm,while the hole spraying occurs in RSCA under the bore diameter of 60 *** terms of bore diameter,the hole spraying prevention of the RSCA is better than that of *** research results enrich the static blasting technology and provide data support and theoretical reference for field application.

关键词： Static cracking agent Water-cement ratio Static blasting Expansion pressure Hole spraying

Anti-asynchrony output regulation for switched systems under switching-Q-learning event-triggering against DoS attacks

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Science China(Information Sciences) 2024年第11期67卷 194-210页

作者： Lili LI Yalin CHEN dan ma Qingjun GUO College of marine Electrical Engineering Dalian Maritime University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University College of Information Science and Engineering Northeastern University

This paper proposes a secure output regulation(SOR) scheme for network switched systems(NSSs) experiencing severely unstable dynamics(SUDs). This scheme aims to address the complex consecutive asynchrony caused by long-duration denial-of-service(LDDoS) attacks. When the denial-of-service(DoS) attack lasts longer than the dwell time of each subsystem, switching to a new subsystem is necessary to manage the unstable dynamic behavior caused by SUDs. The controller cannot immediately obtain information about the new modality. However, owing to the delayed access to new modality information by the controller, consecutive asynchrony occurs. To tackle this, we propose a resilient switching rule that mitigates the impact of consecutive asynchrony by choosing the optimal subsystem once the minimum dwell time is met. Multi-stage event-triggering mechanisms(METMs) are proposed to coordinate with switching signals by incorporating modality matching conditions and a switching-Q-learning algorithm. These mechanisms reduce asynchronous durations by aligning modality matching conditions and terminating attacks using attack parameters. This control scheme for SOR of NSSs with SUDs disturbed by LDDoS attacks provides a detailed analysis of dynamic switching behavior, leveraging the resilient switching rule and METMs. Finally,the feasibility of the proposed methodology is substantiated through simulations with an F-18 aircraft model.

关键词： switched systems long-duration DoS attacks consecutive asynchrony switching-$Q$-learning algorithm multi-stage event-triggering resilient switching rule