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Robust fault diagnosis with disturbance rejection and attenuation for systems with multiple disturbances

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Journal of Systems Engineering and Electronics 2011年第1期22卷 135-140页

作者： Songyin cao Lei Guo Xinyu wen School of Automation Southeast University Nanjing 210096 E R. China School of Instrumentation Science and Opto-Electronics Engineering Beihang University Beijing 100191 Po R. China

The fault diagnosis problem is investigated for a class of nonlinear neutral systems with multiple ***-varying faults are considered and multiple disturbances are supposed to include the unknown disturbance modeled by an exo-system and norm bounded uncertain disturbance.A nonlinear disturbance observer is designed to estimate the modeled ***,the fault diagnosis observer is constructed by integrating disturbance observer with disturbance attenuation and rejection *** augmented Lyapunov functional approach,which involves the tuning parameter and slack variable,is applied to make the solution of inequality more ***,applications for a two-link robotic manipulator system are given to show the efficiency of the proposed approach.

关键词： robust fault diagnosis observer design multiple disturbances anti-disturbance fault diagnosis disturbance rejection and attenuation.

Zn-Fe and Y-modified Zn-Fe coatings on 42CrMo steel via pack cementation

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Rare Metals 2021年第8期40卷 2266-2274页

作者： Li Liu Si-Rong Yu wen-An cao School of Materials Science and Engineering China University of Petroleum(East China)Qingdao266580China

Zn-Fe and Y-modified Zn-Fe coatings were prepared on 42 CrMo steel through pack cementation processes at 370,390 and 410℃ for 4 h.Y modification was achieved through the co-deposition of Zn and Y_(2)O_(3).The effects of Y modification on microstructure,formation and corrosion behavior of the Zn-Fe coating were *** coating thickness increased with an increase in *** Y-modified Zn-Fe coating was thicker than the plain Zn-Fe *** the Zn-Fe coating and Y-modified Zn-Fe coating showed single-layered structures,but the overall microstructure was improved by Y *** activation energies for Zn-Fe coating and Y-modified Zn-Fe coating were 113.15 and80.65 kJ·mol^(-1),*** Zn-Fe coating consisted of FeZn_(13) and Fe11Zn40 *** effects of Y modification on the corrosion behavior of the Zn-Fe coating were evaluated through an immersion test and polarization *** results showed that the corrosion resistance was improved by Y modification.

关键词： Pack cementation Coating Modification Activation energy Corrosion

Extracting Variable-Depth Logical Document Hierarchy from Long Documents:Method,Evaluation,and Application

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Journal of Computer Science & Technology 2022年第3期37卷 699-718页

作者： Rong-Yu cao Yi-xuan cao Gan-Bin Zhou Ping Luo Key Laboratory of Intelligent Information Processing of Chinese Academy of Sciences Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China WeChat Search Application Department Tencent Holdings Ltd.Beijing 100080China Peng Cheng Laboratory Shenzhen 518066China

In this paper,we study the problem of extracting variable-depth"logical document hierarchy"from long documents,namely organizing the recognized"physical document objects"into hierarchical *** discovery of logical document hierarchy is the vital step to support many downstream applications(e.g.,passage-based retrieval and high-quality information extraction).However,long documents,containing hundreds or even thousands of pages and a variable-depth hierarchy,challenge the existing *** address these challenges,we develop a framework,namely Hierarchy Extraction from Long Document(HELD),where we"sequentially"insert each physical object at the proper position on the current *** whether each possible position is proper or not can be formulated as a binary classification *** further improve its effectiveness and efficiency,we study the design variants in HELD,including traversal orders of the insertion positions,heading extraction explicitly or implicitly,tolerance to insertion errors in predecessor steps,and so *** for evaluations,we find that previous studies ignore the error that the depth of a node is correct while its path to the root is *** such mistakes may worsen the downstream applications seriously,a new measure is developed for a more careful *** empirical experiments based on thousands of long documents from Chinese financial market,English financial market and English scientific publication show that the HELD model with the"root-to-leaf"traversal order and explicit heading extraction is the best choice to achieve the tradeoff between effectiveness and efficiency with the accuracy of 0.972,6,0.729,1 and 0.957,8 in the Chinese financial,English financial and arXiv datasets,***,we show that the logical document hierarchy can be employed to significantly improve the performance of the downstream passage retrieval *** summary,we conduct a systematic study on this task in terms of methods

关键词： logical document hierarchy long documents passage retrieval

Synthesis and Crystal Structure of a Mononuclear Zn(II) Complex with Tridentate Schiff Base,Zn(C_(12)H_(18)N_2O)(NCS)_2

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1031-1034页

作者： CAI wen-xuan wen Yi-Hang SU Hong FENG Yun-Long Institute of Physical Chemistry Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Zhejiang Normal University Jinhua 321004 China

The title complex Zn（HL）（NCS）2 （C14H18N4OS2Zn, Mr = 387.81, HL = N-（3-dimethyl-aminopropyl）-salicylaldimine） has been synthesized by the reaction of ZnSO4·7H2O with the Schiff base N-（3-dimethylaminopropyl）-salicylaldimine derived from the condensation reaction of 3-dimethylamino- 1-propylamine with salicyladehyde. It crystallizes in the monoclinic system, space group P21/n with a = 9.8360（8）, b = 14.930（1）, c = 12.277（1） A, β= 101.455（2）°, V= 1767.0（3） A 3, Z = 4, F（000） = 800, Dc= 1.458 g/cm^3 and ,μ（MoKα） = 1.631 mm^-1. The structure was refined to R = 0.0463 and wR = 0.1065 for 2681 observed reflections （1 〉 2σ（I））. Crystal analyses revealed that the Zn（Ⅱ） atom is coordinated by two nitrogen atoms of two NCS^-, and an oxygen atom as well as a nitrogen atom of amine from the neutral Schiff base ligand of N-（3-dimethyl-aminopropyl）-salicylaldimine to give a distorted tetrahedral geometry.

关键词： 3-dimethylamino-1-propylamine salieylaldehyde Sehiff base,

On the non-local priors for sparsity selection in high-dimensional Gaussian DAG models

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Statistical Theory and Related Fields 2021年第4期5卷 332-345页

作者： xuan cao Fang Yang Division of Statistics and Data Science Department of Mathematical SciencesUniversity of CincinnatiCincinnatiOHUSA

We consider sparsity selection for the Cholesky factor L of the inverse covariance matrix in high-dimensional Gaussian DAG *** sparsity is induced over the space of L via non-local priors,namely the product moment(pMOM)prior[Johnson,V.,&Rossell,D.(2012).Bayesian model selection in high-dimensional *** of the American Statistical Asso-ciation,107(498),***://***/10.1080/01621459.2012.682536]and the hierarchi-cal hyper-pMOM prior[cao,X.,Khare,K.,&Ghosh,M.(2020).High-dimensional posterior consistency for hierarchical non-local priors in *** Analysis,15(1),***://***/10.1214/19-BA1154].We establish model selection consistency for Cholesky fac-tor under more relaxed conditions compared to those in the literature and implement an efficient MCMC algorithm for parallel selecting the sparsity pattern for each column of *** demonstrate the validity of our theoretical results via numerical simulations,and also use further simulations to demonstrate that our sparsity selection approach is competitive with existing methods.

关键词： Bayesian DAG models non-local priors high-dimensional data posterior consistency graph selection

Algebraic-Geometric Solution to (2+1)-Dimensional Sawada-Kotera Equation

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Communications in Theoretical Physics 2008年第1期49卷 31-36页

作者： cao Ce-wen YANG Xiao Department of Mathematics Zhengzhou University Zhengzhou 450052 China

Special solution of the （2＋1）-dimensional Sawada Kotera equation is decomposed into three （0＋1）- dimensional Bargmann flows. They are straightened out on the Jacobi variety of the associated hyperelliptic curve.... 详细信息

关键词： (2+1)-dimensional Sawada Kotera equation algebraic-geometric solution higher KdV equations

HDR-Net-Fusion:Real-time 3D dynamic scene reconstruction with a hierarchical deep reinforcement network

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Computational Visual Media 2021年第4期7卷 419-435页

作者： Hao-xuan Song Jiahui Huang Yan-Pei cao Tai-Jiang Mu BNRist Department of Computer Science and TechnologyTsinghua UniversityBeiing 100084China Kuaishou Technology Co. Ltd.Beijing 100085China

Reconstructing dynamic scenes with commodity depth cameras has many applications in computer graphics,computer vision,and ***,due to the presence of noise and erroneous observations from data capturing devices and the inherently ill-posed nature of non-rigid registration with insufficient information,traditional approaches often produce low-quality geometry with holes,bumps,and *** propose a novel 3D dynamic reconstruction system,named HDR-Net-Fusion,which learns to simultaneously reconstruct and refine the geometry on the fly with a sparse embedded deformation graph of surfels,using a hierarchical deep reinforcement(HDR)*** latter comprises two parts:a global HDR-Net which rapidly detects local regions with large geometric errors,and a local HDR-Net serving as a local patch refinement operator to promptly complete and enhance such *** the global HDR-Net is formulated as a novel reinforcement learning problem to implicitly learn the region selection strategy with the goal of improving the overall reconstruction *** applicability and efficiency of our approach are demonstrated using a large-scale dynamic reconstruction *** method can reconstruct geometry with higher quality than traditional methods.

关键词： dynamic 3D scene reconstruction deep reinforcement learning point cloud completion deep neural networks

Dielectric genetic tailoring strategy dominating MoSe_(2)@rGO assembled architecture with electromagnetic functions

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Journal of Advanced Ceramics 2024年第9期13卷 1461-1472页

作者： wen-Qiang cao Qi Zheng Lin Li Chuan-Bao cao Mao-Sheng cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics&Electron EngineeringHarbin Normal UniversityHarbin 150025China

The intensification of electromagnetic(EM)pollution and the development of military detection technology have increased the requirements for EM functional *** this study,a molybdenum diselenide@reduced graphene oxide(MoSe_(2)@rGO)-assembled architecture is constructed,where the MoSe_(2) nanosheets grow uniformly on the rGO *** regulating the contributions of conduction genes and polarization genes,adjustable EM functions of MoSe_(2)@rGO hybrids can be *** reflection loss(RL)of the sample can reach−68.7 dB at a thickness of 2.32 mm,and the maximum effective absorption bandwidth can reach 5.04 *** conduction genes dominate,the MoSe_(2)@rGO hybrids exhibit a 98.7%electromagnetic interference(EMI)shielding *** design of the EM energy conversion device and the results of the radar cross section(RCS)simulation demonstrate the practical application potential of the *** work provides inspiration for designing multifunctional EM materials.

关键词： MoSe_(2) graphene hybrids dielectric gene microwave absorption(MA) electromagnetic interference(EMI)shielding

Design,synthesis,and biological evaluation of novel nitric oxide releasing dehydroandrographolide derivatives

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Chinese Journal of Natural Medicines 2018年第10期16卷 782-790页

作者： YAN Lin DAI Yu-xuan GU Guo-Long PAN Miao-Bo WU Shuai-Cong cao Yu HUANG wen-Long Institute for Innovative Drug Design and Evaluation School of PharmacyHenan University State Key Laboratory of Natural Medicines Center of Drug DiscoveryChina Pharmaceutical University School of Pharmacy Yancheng Teachers University Department of Dermatology First Affiliated Hospital of Guizhou Medical University Jiangsu Key Laboratory of Drug Discovery for Metabolic Disease China Pharmaceutical University

A series of new hybrids of dehydroandrographolide(TAD),a biologically active natural product,bearing nitric oxide(NO)-releasing moieties were synthesized and designated as NO-donor *** biological activities of target compounds were studied in human erythroleukemia K562 cells and breast cancer MCF-7 *** evaluation indicated that the most active compound I-5 produced high levels of NO and inhibited the proliferation of K562(IC_(50) 1.55μmol?L^(–1))and MCF-7(IC_(50)2.91μmol?L^(–1))cells,which were more potent than the lead compound TAD and attenuated by an NO *** conclusion,I-5 is a novel hybrid with potent antitumor activity and may become a promising candidate for future intensive study.

关键词： Tehydroandrographolide Nitric oxide Anticancer