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Repetitive Control for TORA Benchmark:An Additive-state-decomposition-based Approach

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International Journal of Automation and computing 2015年第3期12卷 289-296页

作者： Quan Quan kai-yuan Cai Department of Automatic Control Beijing University of Aeronautics and Astronautics

The repetitive control(RC) or repetitive controller problem for nonminimum phase nonlinear systems is both challenging and practical. In this paper, we consider an RC problem for the translational oscillator with a rotational actuator(TORA), which is a nonminimum phase nonlinear system. The major difficulty is to handle both a nonminimum phase RC problem and a nonlinear problem simultaneously. For such purpose, a new RC design, namely the additive-state-decomposition-based approach, is proposed,by which the nonminimum phase RC problem and the nonlinear problem are separated. This makes RC for the TORA benchmark tractable. To demonstrate the effectiveness of the proposed approach, a numerical simulation is given.

关键词： Additive state decomposition repetitive control translational oscillator with a rotational actuator(TORA) rotational-translation

Analysis of severe core damage accident progression for the heavy water reactor

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Nuclear Science and Techniques 2010年第4期21卷 251-256页

作者： TONG Lili yuan kai yuan Jingtian CAO Xuewu School of Mechanical Engineering Shanghai Jiao Tong University' Shanghai 200240 China

In this study,the severe accident progression analysis of generic Canadian deuterium uranium reactor 6 was preliminarily provided using an integrated severe accident analysis *** selected accident sequences were multiple steam generator tube rupture and large break loss-of-coolant accidents because these led to severe core damage with an assumed unavailability for several critical safety *** progressions of severe accident included a set of failed safety systems normally operated at full power,and initiative events led to primary heat transport system inventory blow-down or boil *** core heat-up and melting,steam generator response,fuel channel and calandria vessel failure were *** results showed that the progression of a severe core damage accident induced by steam generator tube rupture or large break loss-of-coolant accidents in a CANDU reactor was slow due to heat sinks in the calandria vessel and vault.

关键词：重水反应堆损坏事故蒸汽发生器堆芯 CANDU堆严重事故热传输系统事故分析

1SWASP J010313.78+352903.7:A Totally Eclipsing Binary with Components in Poor Thermal Contact

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Research in Astronomy and Astrophysics 2023年第1期23卷 32-39页

作者： Zhihua Wang Liying Zhu kai yuan School of Mathematics and Information Sciences Yantai UniversityYantai 264005China Yunnan Observatories Chinese Academy of SciencesKunming 650216China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

We presented photometry for an EB-type totally eclipsing binary,1SWASP J010313.78+352903.7,observed with the Xinglong 85 cm telescope on 2021 October *** curves in five bands(including the TESS data)were analyzed by employing the Wilson-Devinney *** photometric solutions show that it is a contact binary with a relatively low mass ratio(q≌0.28),relatively large fill-out factor(f≌40%)and large temperature difference(ΔT≌1700 K).*** is up to about 9%of variable light amplitude of the asymmetric light *** is well described by double-hot spots model on the surface of the cooler *** two hot spots are both in growing and *** may be caused by two different mechanics,i.e.,magnetic stellar activity and mass *** large temperature difference between the two contact components indicates that they share a non-thermal equilibrium common envelope.

关键词： (stars:)binaries(including multiple) close-(stars:)binaries eclipsing-stars individual(1SWASP J010313.78+352903.7)

Research on linear/nonlinear viscous damping and hysteretic damping in nonlinear vibration isolation systems

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Applied Mathematics and Mechanics(English Edition) 2020年第7期41卷 983-998页

作者： Zhong ZHANG Muqing NIU kai yuan Yewei ZHANG Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment EngineeringBeijing 100076China School of Science Harbin Institute of TechnologyShenzhen 518055China College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China

A nonlinear vibration isolation system is promising to provide a high-efficient broadband isolation *** this paper,a generalized vibration isolation system is established with nonlinear stiffness,nonlinear viscous damping,and Bouc-Wen(BW)hysteretic *** approximate analytical analysis is performed based on a harmonic balance method(HBM)and an alternating frequency/time(AFT)domain *** evaluate the damping effect,a generalized equivalent damping ratio is defined with the stiffness-varying characteristics.A comprehensive comparison of different kinds of damping is made through numerical *** is found that the damping ratio of the linear damping is related to the stiffness-varying characteristics while the damping ratios of two kinds of nonlinear damping are related to the responding *** linear damping,hysteretic damping,and nonlinear viscous damping are suitable for the small-amplitude,medium-amplitude,and large-amplitude conditions,*** hysteretic damping has an extra advantage of broadband isolation.

关键词： vibration isolation nonlinear damping Bouc-Wen(BW)model harmonic balance method(HBM)

Intelligent Mobile Video Surveillance System with Multilevel Distillation

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Journal of Electronic Science and Technology 2017年第2期15卷 133-140页

作者： yuan-kai Wang Hung-Yu Chen Department of Electrical Engineering Fu Jen Catholic UniversityNew Taipei City 24205 Intelligent System Lab.Fu Jen Catholic University New Taipei City 24205

This paper proposes a mobile video surveillance system consisting of intelligent video analysis and mobile communication networking. This multilevel distillation approach helps mobile users monitor tremendous surveillance videos on demand through video streaming over mobile communication networks. The intelligent video analysis includes moving object detection/tracking and key frame selection which can browse useful video clips. The communication networking services, comprising video transcoding, multimedia messaging, and mobile video streaming, transmit surveillance information into mobile appliances. Moving object detection is achieved by background subtraction and particle filter tracking. Key frame selection, which aims to deliver an alarm to a mobile client using multimedia messaging service accompanied with an extracted clear frame, is reached by devising a weighted importance criterion considering object clarity and face appearance. Besides, a spatial- domain cascaded transcoder is developed to convert the filtered image sequence of detected objects into the mobile video streaming format. Experimental results show that the system can successfully detect all events of moving objects for a complex surveillance scene, choose very appropriate key frames for users, and transcode the images with a high power signal-to-noise ratio （PSNR）.

关键词： Index Terms---Mobile video streaming moving object detection key frame extraction video surveillance video transcoding.

Automatic generation of optical initial configuration based on Delano diagram

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Research in Astronomy and Astrophysics 2016年第1期16卷 59-66页

作者： kai-yuan Zhang Xiang-Yan yuan Xiang-Qun Cui National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology Nanjing 210042 China Key Laboratory of Astronomical Optics & Technology Nanjing Institute of Astronomical Optics & Technology Chinese Academy of Sciences Nanjing 210042 China University of Chinese Academy of Sciences Beijing 100049 China

This paper presents a method to automatically initialize an optical system based on the Delano diagram. The process to generate the optical initial configuration is constrained by the control points, which are deduced from parameters related to basic design requirements. We present the theory and method to generate the optical initial configuration automatically when the basic design requirements are known. Two optical systems are taken as examples to demonstrate the proposed method.

关键词： telescopes -- methods: analytical

Docking control for probe-drogue refueling: An additive-state-decomposition-based output feedback iterative learning control method

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Chinese Journal of Aeronautics 2020年第3期33卷 1016-1025页

作者： Jinrui REN Quan QUAN Cunjia LIU kai-yuan CAI School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Department of Aeronautical and Automotive Engineering Loughborough UniversityLeicestershire LE113TUUnited Kingdom

Designing a controller for the docking maneuver in Probe-Drogue Refueling(PDR) is an important but challenging task, due to the complex system model and the high precision *** order to overcome the disadvantage of only feedback control, a feedforward control scheme known as Iterative Learning Control(ILC) is adopted in this ***, Additive State Decomposition(ASD) is used to address the tight coupling of input saturation, nonlinearity and the property of Non Minimum Phase(NMP) by separating these features into two subsystems(a primary system and a secondary system).After system decomposition, an adjoint-type ILC is applied to the Linear Time-Invariant(LTI) primary system with NMP to achieve entire output trajectory tracking, whereas state feedback is used to stabilize the secondary system with input *** two controllers designed for the two subsystems can be combined to achieve the original control goal of the PDR ***, to compensate for the receiverindependent uncertainties, a correction action is proposed by using the terminal docking error,which can lead to a smaller docking error at the docking *** tests have been carried out to demonstrate the performance of the proposed control method, which has some advantages over the traditional derivative-type ILC and adjoint-type ILC in the docking control of PDR.

关键词： Additive state decomposition Adjoint operator Docking control Iterative learning control Probe-drogue refueling Stable inversion

Orexin Receptor Antagonists as Emerging Treatments for Psychiatric Disorders

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Neuroscience Bulletin 2020年第4期36卷 432-448页

作者： Ying Han kai yuan Yongbo Zheng Lin Lu National Institute of Drug Dependence and Beijing Key Laboratory of Drug Dependence Peking UniversityBeijing 100191China Peking University Sixth Hospital Peking University Institute of Mental HealthNHC Key Laboratory of Mental Health(Peking University)National Clinical Research Center for Mental Disorders(Peking University Sixth Hospital)Beijing 100191China Peking-Tsinghua Center for Life Sciences and PKU-IDG/McGovern Institute for Brain Research Peking UniversityBeijing 100871China

Orexins comprise two neuropeptides produced by orexin neurons in the lateral hypothalamus and are released by extensive projections of these neurons throughout the central nervous system. Orexins bind and activate their associated G protein-coupled orexin type 1 receptors(OX1Rs) and OX2Rs and act on numerous physiological processes, such as sleep-wake regulation, feeding, reward,emotion, and motivation. Research on the development of orexin receptor antagonists has dramatically increased with the approval of suvorexant for the treatment of primary insomnia. In the present review, we discuss recent findings on the involvement of the orexin system in the pathophysiology of psychiatric disorders, including sleep disorders,depression, anxiety, and drug addiction. We discuss the actions of orexin receptor antagonists, including selective OX1R antagonists (SORA1s), selective OX2R antagonists(SORA2s), and dual OX1/2R antagonists (DORAs), in the treatment of these disorders based on both preclinical and clinical evidence. SORA2s and DORAs have more pronounced efficacy in the treatment of sleep disorders,whereas SORA1s may be promising for the treatment of anxiety and drug addiction. We also discuss potential challenges and opportunities for the application of orexin receptor antagonists to clinical interventions.

关键词： Orexin Insomnia Depression Anxiety Drug addiction

Rewiring the transcriptional circuitries in cancer by endogenous retroviruses

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Journal of Molecular Cell Biology 2022年第8期14卷 67-68页

作者： Li Li Yinshuang Li Lu Lv kai yuan Hunan Key Laboratory of Molecular Precision Medicine Department of OncologyXiangya HospitalCentral South UniversityChangsha 410000China The Biobank of Xiangya Hospital Central South UniversityChangsha 410000China

With sequence similarities to exogenous retroviruses,the proviral DNA elements named endogenous retroviruses(ERVs)make up∼8% of human genome,threatening genomic stability meanwhile nurturing regulatory *** host epigenetic mechanisms are enlisted to limit the ERVs’***,in certain physiological and pathophysiological processes,distinct ERVs become abnormally activated,rewiring and perplexing the host regulons at different levels(Cosby et al.,2019).

关键词： endogenous al. listed