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Strong γc-γcl H∞ stabilization for networked control systems under denial of service attacks

JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS 2019年第5期356卷 2723-2741页

作者： Zhu, Yanfei Yang, fuwen Li, Chuanjiang zhang, Yilian Han, Qing-Long Shanghai Normal Univ Coll Informat Mech & Elect Engn Shh 200234 Peoples R China Griffith Univ Griffith Sch Engn Gold Coast Campus Southport Qld 4222 Australia Shanghai Maritime Univ Key Lab Marine Technol & Control Engn Minist Commun Shh 201306 Peoples R China Swinburne Univ Technol Sch Software & Elect Engn Melbourne Vic 3122 Australia

This paper is concerned with the strong gamma(c)-gamma H-cl (infinity) stabilization problem for networked control systems (NCSs) subject to denial of service (DoS) attacks, which are common attack behaviors that affect the packet transmission of measurement or control signals. The purpose of the problem under consideration is to design a stable dynamic output feedback (DOF) controller (strong stabilizing controller) with the prescribed H-infinity performance norm bound gamma(c) to tolerate multiple packet dropouts caused by DoS attacks, such that, the closed-loop system is mean-square stable and captures the H-infinity disturbance attenuation norm bound gamma(cl). Based on the Lyapunov functional and the stochastic control approach, some sufficient conditions with the form of matrix inequalities for the existence of the desired stable DOF controller are established. Then, by an orthogonal complement space technique, the controller gain is parameterized. Next, an iterative linear matrix inequality (LMI) algorithm is developed to obtain the controller gain. Finally, the usefulness of the proposed method is indicated by a numerical simulation example. (C) 2019 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.

关键词： Networked control systems

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Experimental study and numerical simulation of long-term behavior of timber beams strengthened with near surface mounted CFRP bars

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MATERIALS AND STRUCTURES 2017年第1期50卷 45-45页

作者： Xu, Qingfeng Chen, Lingzhu Harries, Kent A. zhang, fuwen Wang, Zhuolin Chen, Xi Shanghai Res Inst Bldg Sci Grp Co Ltd Shanghai Key Lab Engn Struct Safety Shanghai 200032 Peoples R China Univ Pittsburgh Dept Civil & Environm Engn Pittsburgh PA 15261 USA

The near-surface mounted (NSM) fiber reinforced polymer (FRP) method has been proven effective and is increasingly applied to strengthen timber beams. However, few studies on the long-term response of such FRP-reinforced timber beams are available. This paper presents the experimental results of three full-size timber beams tested under sustained load for 1200 days, including an unstrengthened reference beam and two CFRP NSM-reinforced timber beams. The strengthened timber beams exhibited similar creep responses as the reference beam. However, the creep-induced strain and curvature at the mid-span section of the strengthened beams were lower than those of the reference beam, which reflects the restraining effect of the CFRP bar. At 50 % of the ultimate load capacity, the strain distribution at the mid-span section of each specimen remained linear, following the plane section assumption. The strain measurements were observed to increase with increases in ambient temperature and relative humidity. The parabolic model, Burgers model and a five-parameter model were employed to predict the long-term deflection of the reference specimen and equations were fitted for these three models. Comparison between the prediction and experimental results shows that the five-parameter model has the greatest accuracy in both the primary and secondary creep phases. Finally, a numerical model was developed using the creep equation available in ANSYS to simulate the long-term deformation of each specimen. The coefficient in the creep equation was defined as being constant at each time step. Good agreement between the simulation and experimental results was observed.

关键词： Near-surface mounted (NSM) CFRP bar Timber beam Long-term behavior Creep

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Power Generation on a Bare Electrodynamic Tether during Debris Mitigation in Space

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INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING 2021年第1期2021卷

作者： Xie, Kan Liang, fuwen Xia, Qimeng Wang, Ningfei zhang, Zun Yuan, Haoxiang Liu, Xiangyang Wu, Zhiwen Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China Beihang Univ Sch Space & Environm Beijing 100191 Peoples R China

Power generation can be realized in space when current is induced on a bare electrodynamic tether system. The performance of power generation is discussed based on a debris mitigation mission by numerical simulation in the paper. A Li-ion battery subsystem is used to complete the energy conversion-harvest and supply the energy. The battery can provide 10-300 W average electric power continuously during several hundred hour mission time. The energy conversion efficiency ranges from 1% to a maximum value 30%. With constant power consumption on board, the battery operation generally experiences a discharging phase, a charging phase, and a stable phase. The first two phases determine the mission risk coefficient. The heating problem in the stable phase cannot be ignored. The optimization of battery design and tether design should be considered for each debris mitigation mission. An extra control circuit or small battery voltage with large capacity for battery design is suggested to eliminate the stable phase. Wide or long tether designs are more appropriate for mission with high or low power demands on board, respectively. The power generation is affected by the system mass and the mission orbit parameters.

关键词： Tetherlines

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9 m长胶合木梁受弯性能和炭化速度的试验研究

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工业建筑 2018年第3期48卷 63-67,131页

作者：陈溪吴勇陈玲珠冯静慧张富文许清风上海市建筑科学研究院、上海市工程结构安全重点实验室上海200032 苏州昆仑绿建木结构科技有限公司江苏苏州215105 上海建科检验有限公司上海201208

对9 m长足尺胶合木梁的受弯性能和炭化速度进行试验研究。结果表明：足尺胶合木梁发生源于纯弯区段木材或连接缺陷的弯曲破坏;跨中截面沿高度方向应变变化符合平截面假定;理论分析和数值模拟方法均可较准确地预测木梁的受弯承载力;数值... 详细信息

对9 m长足尺胶合木梁的受弯性能和炭化速度进行试验研究。结果表明：足尺胶合木梁发生源于纯弯区段木材或连接缺陷的弯曲破坏;跨中截面沿高度方向应变变化符合平截面假定;理论分析和数值模拟方法均可较准确地预测木梁的受弯承载力;数值模拟方法还可以较准确地模拟木梁破坏全过程的变形情况。实测胶合木梁在ISO 834升温曲线下的炭化速度为0.7 mm/min,与欧洲规范一致,略小于GB/T 50708—2012《胶合木结构技术规范》的规定值,说明胶合木梁具有可靠的耐火性能。

关键词：胶合木梁抗弯承载力受弯性能炭化速度耐火性能

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Insight into the tolerance, biochemical and antioxidative response in three moss species on exposure to BDE-47 and BDE-209

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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019年 181卷 445-454页

作者： Zhao, Jianhua zhang, Meng zhang, Wei Liu, fuwen Huang, Kai Lin, Kuangfei East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asse Sch Resource & Environm Engn Shanghai 200237 Peoples R China Quzhou Univ Coll Chem & Mat Engn Quzhou 324000 Peoples R China

Responses of Hypnum plumaeforme, Thuidium cymbifolium, and Plagiomnium cuspidatum to short-term (96 h) BDE-47 and BDE-209(0, 0.005, 0.05, 0.5, and 5 mu M, respectively) stress were investigated. Both BDE-47 and BDE-209 increased the lipid peroxidation in the three moss species, malondialdehyde (MDA) content increased with the elevated concentration of contaminants, and followed the order: P. cuspidatum > H. plumaeforme > T. cymbifolium on exposure to different concentrations. BDE-47 and BDE-209 stimulated the superoxide dismutase (SOD) and peroxidase (POD) activity of the three moss species, indicating that they played an important role in preventing oxidative stress. Reactive oxygen species (ROS) accumulation was positively correlated with the level of contaminants. The response of anti-oxidative enzymes to BDE-47 and BDE-209 stress differed among the three species. At 5 mu M BDE-47 and BDE-209 treatment, the chlorophyll content of T. cymbifolium was even a little higher than the control group. Proline played an important role for the scavenging of ROS in P. cuspidatum and T. cymbifolium. In summary, BDE-47 was more toxic to the three moss species than BDE-209. P. cuspidatum was the most sensitive and T. cymbifolium was the most tolerant species to BDE-47 and BDE-209 stress. The strong resistance and tolerance of T. cymbifolium, combined with sensitive/moderate anti-oxidative response could elucidate its potential use as bio-indicator in the ecological risk assessment of BDE-47 and BDE-209 contamination.

关键词： Anti-oxidative response BDE-47 and BDE-209 Bio-indicator Lipid peroxidation Mosses Reactive oxygen species

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Highly efficient photocatalytic hydrogen production via porphyrin-fullerene supramolecular photocatalyst with donor-acceptor structure

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CHEMICAL ENGINEERING JOURNAL 2022年 444卷

作者： Liu, Liping Chen, Xianjie Chai, Yongqiang zhang, Weina Liu, Xiaolong Zhao, fuwen Wang, Zhuan Weng, Yuxiang Wu, Bo Geng, Hua Zhu, Yongfa Wang, Chunru Chinese Acad Sci Inst Chem Beijing Natl Lab Mol Sci Key Lab Mol Nanostruct & Nanotechnol Beijing 100190 Peoples R China Tsinghua Univ Dept Chem Beijing 100084 Peoples R China Southwest Univ Sci & Technol Sch Mat Sci & Engn State Key Lab Environm Friendly Energy Mat Mianyang 621010 Sichuan Peoples R China Capital Normal Univ Beijing Adv Innovat Ctr Imaging Theory & Technol Dept Chem Beijing 100048 Peoples R China Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys CAS Key Lab Soft Matter Phys Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

A novel tetraphenylporphyrin-C-60 supramolecular photocatalyst (SA-TPP-C-60) with donor-acceptor (D-A) structure is successfully constructed. Self-assembly of covalently-linked D-A molecule TPP-C-60 gives rise to SA-TPP-C-60 with highly-ordered layered D-A structure. TPP-C-60 molecule is characterized with strong D-A interaction, inducing a significantly larger molecular dipole moment (ca. 4.86 D) than the referential TPP molecule (only 0.04 D). In consequence, robust internal electric field (IEF) with 4.7 times enhancement is built up in SA-TPP-C-60, contributing to ultrafast photogenerated charge separation (similar to 0.5 ps) and enhanced charge transport. Notably, unprecedented long-lived photogenerated charge separation (tau = 26.3 ns) was observed in SA-TPP-C-60. Thus, the photocatalytic hydrogen evolution performance of SA-TPP-C-60 reached 10.69 mmol g(-1)h(-1) , which is about 80 times higher than SA-TPP. Briefly, this study sheds light on D-A structure engineering of supramolecular photocatalysts for high-performance photocatalytic applications.

关键词： Donor-acceptor structure Molecular dipole Robust internal electric field Ultrafast charge separation Photocatalytic hydrogen production

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Genomic evidence for two phylogenetic species and long-term population bottlenecks in red pandas

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SCIENCE ADVANCES 2020年第9期6卷 5751-5751页

作者： Hu, Yibo Thapa, Arjun Fan, Huizhong Ma, Tianxiao Wu, Qi Ma, Shuai zhang, Dongling Wang, Bing Li, Min Yan, Li Wei, fuwen Chinese Acad Sci Inst Zool CAS Key Lab Anim Ecol & Conservat Biol Beijing Peoples R China Chinese Acad Sci Ctr Excellence Anim Evolut & Genet Kunming Yunnan Peoples R China Univ Chinese Acad Sci Beijing Peoples R China

The red panda (Ailurus fulgens), an endangered Himalaya-endemic mammal, has been classified as two subspecies or even two species - the Himalayan red panda (A. fulgens) and the Chinese red panda (Ailurus styani) - based on differences in morphology and biogeography. However, this classification has remained controversial largely due to lack of genetic evidence, directly impairing scientific conservation management. Data from 65 whole genomes, 49 gamma-chromosomes, and 49 mitochondrial genomes provide the first comprehensive genetic evidence for species divergence in red pandas, demonstrating substantial inter-species genetic divergence for all three markers and correcting species-distribution boundaries. Combined with morphological evidence, these data thus clearly define two phylogenetic species in red pandas. We also demonstrate different demographic trajectories in the two species: A. styani has experienced two population bottlenecks and one large population expansion over time, whereas A. fulgens has experienced three bottlenecks and one very small expansion, resulting in very low genetic diversity, high linkage disequilibrium, and high genetic load.

关键词： Phylogenetic

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A Novel Sliding Mode Estimation for Microgrid Control With Communication Time Delays

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IEEE TRANSACTIONS ON SMART GRID 2019年第2期10卷 1509-1520页

作者： Yan, Huaicheng Zhou, Xuping zhang, Hao Yang, fuwen Wu, Zheng-Guang East China Univ Sci & Technol Minist Educ Key Lab Adv Control & Optimizat Chem Proc Shanghai 200237 Peoples R China Hubei Normal Univ Coll Mechatron & Control Engn Huangshi 435002 Peoples R China Tongji Univ Dept Control Sci & Engn Shanghai 200092 Peoples R China Griffith Univ Sch Engn Gold Coast Qld 4222 Australia Zhejiang Univ State Lab Ind Control Technol Hangzhou 310027 Zhejiang Peoples R China

This paper deals with the sliding mode estimation for microgrid with time delays. Delay has a great impact on large power grids' management for microgrid, which terribly reduces the stability and quality of microgrid. Random delay caused by load dependent congestion, constant transmission delay and constant delay in microgrid are considered in this paper. To eliminate the adverse effects of delays, a novel sliding mode estimation-based controller is designed to predict time delays and microgrid states, and to reject the disturbance of estimation errors. The mathematical inverter model containing electrical characteristics is regarded as the model of practical microgrid system. Delay estimation with learning parameter and state estimation are derived according to the inverter model. By regarding estimation errors as disturbance of sliding mode control (SMC), the control signal of SMC is adaptively changed in the sliding mode estimation-based control loop to ensure the stability of system and accuracy of estimation. Exponential reaching law (ERL) is implemented to improve the chattering issues and reaching performance of SMC. Lyapunov approach is exploited to analyze the stability of sliding motion. Finally, the proposed SMC strategy is validated by simulation experiments of a microgrid with time delays.

关键词： Microgrid sliding mode estimation time delays exponential reaching law

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Novel Optical Fibers Assisting Electric Telecommunication Network Construction

Novel Optical Fibers Assisting Electric Telecommunication Ne...

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Asia Communications and Photonics Conference (ACP) / International Conference on Information Photonics and Optical Communications (IPOC)

作者： Wu, Guangzhe Li, Bozhong Deng, Li Xia, Xiaomeng Lu, He Jin, Wei Wang, Qian Wang, Ying Li, Can Bai, fuwen Lei, Hanlin Zhou, Xinyan Huang, Liwei Hu, Chao zhang, Liyan Shui, Biao Zhou, Hongyan Wu, Jun State Grid Informat & Telecommun Branch Beijing 100761 Peoples R China Yangtze Opt Fibre & Cable Joint Stock Ltd Co State Key Lab Opt Fibre & Cable Mfg Technol Wuhan 430073 Peoples R China Hubei Optic Valley Lab Wuhan 430073 Peoples R China

G.654.E fiber can provide a new solution for ultra-long distance transmission for power backbone communication network. 200 mu m G.657.A1 fiber can increase the fiber number of OPGW in power access communication network.

ISBN: (纸本)9781665481557

关键词： electric backbone communication network electric access communication network G.654.E 200 mu m G.657.A1 OPGW

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Study on the CHJ01 Antitumor Activity and Mechanism via Targeting Sphingosine Kinase 1 in A549 Cells

Pharmaceutical Science Advances

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Pharmaceutical Science Advances 2025年

作者： Caiyu Liu Shengmei Gao Bo Liu Feipeng zhang Yanling Mu fuwen Wang Yan Li School of Pharmaceutical Sciences & Institute of Materia Medica Shandong First Medical University & Shandong Academy of Medical Sciences Jinan 250117 China National Key Laboratory of Advanced Drug Delivery System Jinan 250117 China

The SphK1 inhibitor development is of great importance for the treatment of non-small cell lung cancer (NSCLC). In this study, CHJ01 which has been previously shown anti-tumor effects was introduced to investigate the detailed antitumor mechanism both in vitro and in vivo . CHJ01 inhibited the A549 cell proliferation, migration, and invasion significantly and showed cytotoxicity to A549. CHJ01 induced G0/G1 cell cycle arrest by increasing ceramide levels and altered the expression of TRAF2, Bcl-2, Bax and RELA. CHJ01 inhibited the TRAF2/ NF-κB signaling pathway and promoted apoptosis by downregulating Bcl-2 and upregulating Bax. In vivo anti-tumor effects were investigated using a nude mouse ectopic tumor model. CHJ01 reduced the volumes and weights of xenograft tumor in nude mice. CHJ01 induced apoptosis by HE staining and immunohistochemistry assay. These results indicated that CHJ01 can be a potential candidate for the treatment of NSCLC.

关键词： CHJ01 sphingosine kinase 1 A549 TRAF2/NF-κB signaling pathway apoptosis non-small cell lung cancer NSCLC

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