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Distributed regression estimation with incomplete data in multi-agent networks

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Science China(Information Sciences) 2018年第9期61卷 168-181页

作者： yinghui wang Peng LIN Yiguang HONG University of Chinese Academy of Sciences Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences

In this paper, distributed regression estimation problem with incomplete data in a time-varying multi-agent network is investigated. Regression estimation is carried out based on local agent information with incomplete in the non-ignorable mechanism. By virtue of gradient-based design and adaptive filter, a distributed algorithm is proposed to deal with a regression estimation problem with incomplete data. With the help of convex analysis and stochastic approximation techniques, the exact convergence is obtained for the proposed algorithm with incomplete data and a jointly-connected multi-agent topology. Moreover, online regret analysis is also given for real-time learning. Then, simulations for the proposed algorithm are also given to demonstrate how it can solve the estimation problem in a distributed way, even when the network configuration is time-varying.

关键词： multi-agent systems time-varying network estimation with incomplete data online learning stochastic approximation

Distributed stochastic mirror descent algorithm for resource allocation problem

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Control Theory and Technology 2020年第4期18卷 339-347页

作者： yinghui wang Zhipeng Tu Huashu Qin Key Lab of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

In this paper,we consider a distributed resource allocation problem of minimizing a global convex function formed by a sum of local convex functions with coupling *** on neighbor communication and stochastic gradient,a distributed stochastic mirror descent algorithm is designed for the distributed resource allocation *** convergence to an optimal solution of the proposed algorithm is given when the second moments of the gradient noises are summable.A numerical example is also given to illustrate the effectiveness of the proposed algorithm.

关键词： Distributed Resource allocation problem Stochastic gradient Mirror descent

Distributed Consensus-Based K-Means Algorithm in Switching Multi-Agent Networks

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Journal of Systems Science & Complexity 2018年第5期31卷 1128-1145页

作者： LIN Peng wang yinghui QI Hongsheng HONG Yiguang Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing 100190 China.

This paper discusses a distributed design for clustering based on the K-means algorithm in a switching multi-agent network, for the case when data are decentralized stored and unavailable to all agents. The authors propose a consensus-based algorithm in distributed case, that is, the double- clock consensus-based K-means algorithm （DCKA）. With mild connectivity conditions, the authors show convergence of DCKA to guarantee a distributed solution to the clustering problem, even though the network topology is time-varying. Moreover, the authors provide experimental results on vari- ous clustering datasets to illustrate the effectiveness of the fully distributed algorithm DCKA, whose performance may be better than that of the centralized K-means algorithm.

关键词： Consensus-based algorithm distributed K-means clustering multi-agent network switching topology.

Cascade-responsive nanobomb with domino effect for anti-tumor synergistic therapies

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National Science Review 2022年第3期9卷 32-41页

作者： Yang Liu yinghui wang Shuyan Song Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences School of Applied Chemistry and Engineering University of Science and Technology of China Department of Chemistry Tsinghua University

The development of reactive oxygen species(ROS) generation agents that can selectively produce sufficient ROS at the tumor site without external energy stimulation is of great significance for the further clinical application of ROS-based therapies. Herein, we designed a cascade-responsive ROS nanobomb(ZnO2@Ce6/CaP@CPPO/BSA, designated as Z@Ce6/Ca P@CB) with domino effect and without external stimulation for the specific generation of multiple powerful ROS storms at the tumor site. The calcium phosphate shell and ZnO2core gradually degrade and release Ca2+, Zn2+and hydrogen peroxide(H2O2) under acid stimulation. On the one hand, Zn2+can enhance the generation of endogenous superoxide anions(·O2~–) and H2O2through the inhibition of the mitochondrial electron transport *** the other hand, the generation of large amounts of exogenous H2O2can cause oxidative damage to tumor cells and further activate bis[2,4,5-trichloro-6-(pentyloxycarbonyl)phenyl] oxalate(CPPO)-mediated chemiexcited photodynamic therapy. In addition, the oxidative stress caused by the generated ROS can lead to the uncontrolled accumulation of Ca2+in cells and further result in Ca2+overload-induced cell death. Therefore, the introduction of Z@Ce6/CaP@CB nanobombs triggered the’domino effect’ that caused multiple heavy ROS storms and Ca2+overload in tumors and effectively activated anti-tumor immune response.

关键词： reactive oxygen species immunotherapy chemiexcited photodynamic therapy ion interference therapy biodegradable

Human steering angle estimation in video based on key point detection and Kalman filter

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Control Theory and Technology 2022年第3期20卷 408-417页

作者： Yanpeng Hu Yuxuan Liu Yanguang Xu yinghui wang School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China KE Holdings Inc. Beijing100085China

Human pose recognition and estimation in video is ***,the process noise and local occlusion bring great challenge to pose *** this paper,we introduce the Kalman filter into pose recognition to reduce noise and solve local occlusion *** core of pose recognition in video is the fast detection of key points and the calculation of human steering ***,we first build a human key point detection *** skipping is performed based on the Hamming distance of the hash value of every two adjacent frames in *** reduction is performed on key point coordinates with the Kalman *** calculate the human steering angle,current state information of key points is predicted using the optimal estimation of key points at the previous *** human steering angle can be calculated based on current and previous state *** improved SENet,NLNet and GCNet modules are integrated into key point detection model for improving *** are also given to illustrate the effectiveness of the proposed algorithm.

关键词： Key point detection Part affinity fields Kalman filter Human steering angle

Preparation, Characterization and Catalytic Performance of Nanometer Ceria-Zirconia Solid Solution

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Journal of Rare Earths 2004年第Z1期22卷 188-190页

作者： Hu Yucai wang yinghui Pan Junyan School of Chemistry and Material Sciences Yantai Normal University Yantai 264025 China School of Chemistry and Material Sciences Yantai Normal University Yantai 264025 China School of Chemistry and Material Sciences Yantai Normal University Yantai 264025 China

Ce0.6Zr0.4O2 solid solution was prepared by co-precipitation technique using hydrazine hydrate as *** physico-chemical techniques such as XRD, FT-Raman, SEM, TEM, *** used to characterize the resultant ***, its catalytic activity was evaluated in the synthesis of n-butyl acetate by the reaction of acetic acid and n-butyl *** results show that ceria-zirconia solid solution forms single cubic structure and its particle diameter is less than 100 *** a sort of solid acid, it possesses high catalytic activity and can be easily separated from reaction *** it is used for ten times, its activity basically kees unchanging.

关键词： nanometer ceria-zirconia solid solution characterization catalytic activity

Removal of dust from flue gas in magnetically stabilized fluidized bed

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Particuology 2008年第2期6卷 116-119页

作者： yinghui wang Keting Gui Mingheng Shi Changfeng Li School of Energy and Power Engineering Jiangsu University Zhenjiang 212013 Jiangsu China Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education Southeast University Nanjing 210096 Jiangsu China

A magnetically stabilized fluidized bed （MSFB,Ф 500mm×2100mm） was designed to study dust removal from flue gas. Based on the mechanism of dust removal in a fixed bed, the effects on collection efficiency of magnetic field intensity, ratio of flue gas velocity to minimum fluidization velocity, bed height, and particle average diameter, were investigated. Then feasible methods for MSFB to better remove dust were proposed. Over 95 % of dust removal with MSFB can be achieved, when stable fluidization is maintained and when magnetic particles are frequently renewed.

关键词： Magnetically stabilized fluidized bed (MSFB) Stable fluidization Dust removal Magnetic particles renewal

A Review of Research Progress in the Genesis of Colloform Pyrite and Its Environmental Indications

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1353-1369页

作者： GAO Shang HUANG Fei wang yinghui GAO Wenyuan Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resource and Civil Engineering Northeastern University

Colloform pyrite is a special form of nano-micro polycrystalline aggregation growth, for which a suitable term is ＂aggregates of nano-micro crystals＂. This kind of colloform texture is observed in various geological bodies, such as ancient sedimentary rocks, modern marine and lake sediments, various types of ore deposits, and modern seafloor hydrothermal vents. This paper summarizes the latest developments and research into the definition, formation mechanisms, and environmental indications of colloform pyrite. There appears to be three main formation mechanisms of colloform pyrite： pseudomorphic replacement; biogenic precipitation; and inorganic precipitation. The morphology, particle size, trace element content and preferential growth orientations of coUoform pyrite microcrystals can be important indicators for sedimentary environments, hydrothermal activity, and ore-forming processes. We suggest that the microscopic features of nano-micro crystals in colloform pyrite and their aggregation growth patterns need further investigation. The relationships between formation mechanisms of colioform pyrite, organic activity and depositional environments require further exploration. To reveal the nature of nano-micro grain aggregation growth in colloform pyrite and analyse its growth environment and evolutionary history, it is supposed to apply nanoscientific and nanotechnological methods, further integrate consideration of macroscopic geological backgrounds and microscopic mineral growth phenomena, combine high-resolution imaging systems and in situ quantitative microanalysis methods and constitute a mergence of earth science, thermodynamics and kinetics, life science, material science, and chemistry in the study.

关键词： colloform pyrite nano-micro crystals aggregation growth mechanism environmental indication nanoscience and nanotechnology

Shell-driven Fine Structure Transition of Core Materials in Co@Au Core-shell Nanoparticles

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Nano-Micro Letters 2012年第4期4卷 235-242页

作者： Yujun Song yinghui wang Shaoxia Ji Jie Ding School of Materials Science and Engineering Beihang University

Co@Au core shell nanoparticles(NPs) of different shell thicknesses were fabricated by a combination of the displacement process and the reduction-deposition process in a microfluidic reactor. The effect of the shell thickness on the fine structures(local atom arrangement) of core materials was investigated by X-ray Absorption Near Edge Structure(XANES) and Extended X-ray Absorption Fine Structure(EXAFS).The results indicate that the shell thickness affects the fine structure of the core materials by causing atomic re-arrangement between the hexagonal close pack(hcp) and the face centered cubic(fcc) structure, and forming Co-Au bonds in the core-shell interface.

关键词： Nanoparticle Core-shell Fine Structure Microfluidic