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作者： Zhang, Ming Lu, Shuaibing Xu, Boyi National Key Laboratory of Science and Technology on Information System Security Beijing China

ISBN: (纸本)9781538636749

As Web attacks are constantly emerging and have caused enormous loss, the effective methods to protect the Web security are becoming increasingly required. We propose an anomaly detection method based on multi-models to detect Web attacks. The method is designed by inspecting the HTTP request messages to identify attacks. Three machine learning models, namely the probability distribution model, the hidden Markov model, and the one-class SVM model are employed to inspect different fields of the HTTP request messages to detect anomalies. The three models work together and the overall detection result is anomalous if at least one model reports an anomaly. The detection mechanism of each model and the corresponding feature extraction algorithm are presented. The experimental results show that the multi-model based detection method has apparent advantage on detecting Web attacks. It craftily makes each individual model to inspect the HTTP request fields that they excel at, thus achieving a high detection rate while keeping a low false alarm rate. © 2017 IEEE.

关键词： Anomaly detection Hidden Markov model One-class SVM model Probability distribution model Web attacks

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Web service applying moving target defense 3

Web service applying moving target defense

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3rd IEEE International Conference on Data science in Cyberspace, DSC 2018

作者： Zhang, Jingzhe Feng, Xuewei Wang, Dongxia Ming, Liang National Key Laboratory of Science and Technology On Information System Security Beijing China

ISBN: (纸本)9781538642108

This paper focuses on studying how Moving Target Defense technology will bring impact about the security and the cost on web service. We propose a novel design named MTD-applying Web Service, a kind of web service based on Moving Target Defense technology, for security enhancement. MTD-applying Web Service unlike traditional web service owning only one static web server and one constant database server, it diversifies its backend sources. Especially, diversification of web servers and database servers makes a great increment of difficulty for attacker to intrude. Finally, a series of experiments also prove our theory effective. According to the result of experiment of evaluating the MTD-applying Web Service system, we can announce that our design can significantly improve the system's security with acceptable cost. © 2018 IEEE.

关键词： Web services

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Magnetic Continuum Robot for Intelligent Manipulation in Medical Applications

SmartBot

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SmartBot 2025年

作者： Yuanbiao Ma Xuanyu An Qijun Yang Mingxue Cai Zhiqiang Tang Jinke Chang Veronica Iacovacci Tiantian Xu Li Zhang Qianqian Wang Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University Nanjing China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Department of Mechanical Engineering National University of Singapore Queenstown Singapore Department of Engineering Science University of Oxford Oxford UK Department of Surgical Biotechnology Division of Surgery & Interventional Science Centre for Biomaterials in Surgical Reconstruction and Regeneration University College London London UK BioRobotics Institute Scuola Superiore Sant’Anna Pisa Italy Department of Excellence in Robotics & AI Scuola Superiore Sant’Anna Pisa Italy Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong China Chow Yuk Ho Technology Center for Innovative Medicine The Chinese University of Hong Kong Hong Kong China Multi-Scale Medical Robotics Center Hong Kong Science Park Hong Kong China

Magnetic continuum robots (MCRs) have garnered substantial attention as a new class of flexible robotic systems capable of navigating complex and confined spaces with remarkable dexterity. By combining continuous, deformable structures with remotely applied magnetic fields, MCRs achieve contactless, remote manipulation, making them well-suited for medical applications. This review introduces recent advances in MCR research, focusing on design principles, structural configurations, and control strategies. Various MCR designs and structures, including those integrated with permanent magnets, magnetic matter, ferromagnetic sphere, and micro coil, are discussed. Furthermore, different magnetic actuation platforms are introduced, and the level of MCR automation is classified based on control strategies. key intelligent manipulation capabilities of MCRs, including navigation, delivery, printing, grasping, imaging, and sensing are explored. Finally, future development priorities and directions are identified to provide insights for advancing intelligent robotic systems.

关键词： intelligent manipulation magnetic actuation magnetic continuum robot medical application

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Predictive Control of Quad-Rotor Delivering Unknown Time-Varying Payloads Based upon Extended State Observer

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Advances in Aerospace science and technology 2019年第2期4卷 29-41页

作者： Yuan Wang Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing China

In this paper, robust control problem is addressed for quad-rotor delivering unknown time-varying payloads. Firstly, the model of a quad-rotor carrying payloads is built. Dynamics of the payloads are treated as disturbances and added into the model of the quad-rotor. Secondly, to enhance system robust-ness, the extended state observer (ESO) is applied to estimate the disturbances from the payloads for feedback compensation. Then a type of predictive controller targeting multiple-input-multiple-output (MIMO) system is developed to degrade the influences caused by sudden changes from load-ing/dropping of the payloads. Finally, by making comparison with the con-ventional cascade proportional-integral-derivative (CPID) and the sliding mode control (SMC) approaches, superiority of the scheme developed is va-lidated. The simulation results indicate that the CPID method shows poor performance on attitude stabilization and the SMC shows input chattering phenomenon even it can achieve satisfied control performances.

关键词： Quad-Rotor Payloads Delivery Attitude Control Disturbance Estimation Feedback Compensation Predictive Control

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Organocatalytic Lithium Chloride Oxidation by Covalent Organic Frameworks for Rechargeable Lithium-Chlorine Batteries

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Angewandte Chemie 2023年第7期136卷

作者： Dr. Yan Xu Mingming Wang Muhammad Sajid Yahan Meng Zehui Xie Lidong Sun Prof. Jian Jin Prof. Wei Chen Dr. Shenxiang Zhang College of Energy Soochow Institute for Energy and Materials Innovations Light Industry Institute of Electrochemical Power Sources Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou Jiangsu 215006 China Department of Applied Chemistry School of Chemistry and Materials Science Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei Anhui 230026 China College of Chemistry Chemical Engineering and Materials Science Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou Jiangsu 215123 China

Rechargeable Li−Cl 2 battery is a promising high energy density battery system. However, reasonable cycle life could only be achieved under low specific capacities due to the sluggish oxidation of LiCl to Cl 2 . Herein, we propose an amine-functionalized covalent organic framework (COF) with catalytic activity, namely COF−NH 2 , that significantly decreases the oxidation barrier of LiCl and accelerates the oxidation kinetics of LiCl in Li−Cl 2 cell. The resulting Li−Cl 2 cell using COF−NH 2 (Li−Cl 2 @COF−NH 2 ) simultaneously exhibits low overpotential, ultrahigh discharge capacity up to 3500 mAh/g and a promoted utilization ratio of deposited LiCl at the first cycle (UR−LiCl) of 81.4 %, which is one of the highest reported values to date. Furthermore, the Li−Cl 2 @COF−NH 2 cell could be stably cycled for over 200 cycles when operating at a capacity of 2000 mAh/g at −20 °C with a Coulombic efficiency (CE) of ≈100 % and a discharge plateau of 3.5 V. Our superior Li−Cl 2 batteries enabled by organocatalyst enlighten an arena towards high-energy storage applications.

关键词： Covalent Organic Framework High Energy Density Lithium Chloride Oxidation Lithium-Chlorine Battery Organocatalysis

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Research on power characteristics matching of electric drive crawler bulldozer 3

Research on power characteristics matching of electric drive...

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3rd IEEE International Conference on Electronic Information technology and Computer Engineering, EITCE 2019

作者： Lun, Li Du, Bo-Feng Yang, Shao-Dong Li, Ji-Shun Henan University of Science and Technology Henan Key Laboratory for Machinery Design and Transmission System Luoyang471003 China Shenzhen Zhaowei Machinery and Electronics Co. Ltd. Shenzhen518105 China Mechanical and Electrical Equipment Engineering Co. Ltd Luoyang471003 China

ISBN: (数字)9781728135847

ISBN: (纸本)9781728135847

According to the composition of the electric drive system of the electric drive crawler bulldozer, the basic parameters of the main components in the electromechanical transmission system were calculated by using theoretical knowledge. The original and improved electric drive crawler bulldozer were simulated and compared respectively by using ADVISOR simulation software in order to verify the power performance of the improved electric drive crawler bulldozer. The studying result shows that the improved drive motor can meet the load characteristics of the crawler bulldozer under the bulldozing conditions through theoretical analysis and simulation research, and the improved electric drive system can meet the power characteristics of the D320E electric drive crawler bulldozer. © 2019 IEEE.

关键词： Computer software

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High piezoelectricity of Sm-doping PIN-PMN-PT transparent ceramics and its potential application in transparent transducers

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Ceramics International 2025年

作者： Yang Qi Yaqi Wang Dashi Fu Wen Gao Miao Yuan Jiaming Zhang Xiaoran Wang Xiaojing Gong Zhihua Xie Riqiang Lin Zhiyan Chen Yongcheng Zhang College of Physics University-Industry Joint Center for Ocean Observation and Broadband Communication National Demonstration Center for Experimental Applied Physics Education Qingdao University Qingdao 266071 China Department of Electrical Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Research Center for Biomedical Optics and Molecular Imaging Key Laboratory of Biomedical Imaging Science and System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

Transparent piezoelectric material can be used to design multi-functional devices by coupling piezoelectric effect with optics. For example, it can be used to design transparent ultrasonic transducers, which can be applied to medical photoacoustic imaging and has more advantages than ultrasound imaging in diagnosis of some diseases. However, the preparation of transparent piezoelectric materials with both high piezoelectric performance and high transmittance is very difficult at present. In this paper, 26Pb(In 1/2 Nb 1/2 )O 3 -46Pb(Mg 1/3 Nb 2/3 )O 3 -28PbTiO 3 (PIN-PMN-PT) transparent piezoelectric ceramics with different concentrations of Sm doping were prepared by a two-step sintering method. The effects of Sm 3+ ions on the microstructure, piezoelectricity, ferroelectricity, dielectricity and transmittance of PIN-PMN-PT transparent ceramics were investigated. When Sm-doping concentration is 3 mol%, the highest piezoelectric coefficient ( d 33 ) reaches 1023 pC/N, and the transmittance is 65.1% (@ 1800 nm). The maximum transmittance reaches to 66.7% (@ 1800 nm) at 1% Sm doping content. Transparent transducers were fabricated based on PIN-PMN-PT transparent piezoceramics, and its ultrasonic echo signal amplitude is 1.5 times higher than that of the LN based transparent transducers, indicating PIN-PMN-PT transparent piezoceramics are excellent candidates for transparent piezoelectric materials in photoacoustic imaging probes.

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Performance comparison of different approximation schemes in matrix MOC

Performance comparison of different approximation schemes in...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Yong, Zheng Peng, Minjun Zhou, Yueshan Qiang, Shenglong Ping, An Wei, Lu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China

ISBN: (纸本)9781713808510

The method of characteristics (MOC) with matrix form has theoretically more favorable features than its standard application, since the time-consuming track sweeping operations are replaced with explicit solution of matrix equation. In traditional MOC, there are three optional discretization strategies: the step characteristic method, diamond difference scheme and linear source approximation. However, their performances in matrix MOC have not be reported so far. The current paper develops their matrix forms and solves the resulted linear systems using preconditioned generalized minimal residual (PGM-RES) method. Additionally, their performances with respect of computation accuracy and efficiency are compared with each other, by simulating a homogeneous hexagonal cell problem and the 2D C5G7 benchmark. The results show that their performances in matrix form are different from that of traditional form. With the same angular quadrature and region partition scheme, the step characteristic method is more efficient significantly than the diamond difference scheme and linear source approximation. Whether the diamond difference scheme and linear source approximation can improve the calculation accuracy or not depends on whether the the spatial mesh is fine enough for every scheme. For the coarser spatial partition strategy, diamond difference scheme and linear source approximation can significantly improve the accuracy of local pin power. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Diamonds

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Safety design and evaluation of loss of forced flow accident of CRS1000

Safety design and evaluation of loss of forced flow accident...

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2018 International Congress on Advances in Nuclear Power Plants, ICAPP 2018

作者： Dan, Zhang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Changshun Road No.328 ShuangLiu County Chengdu610213 China

ISBN: (纸本)9780894487552

CSR1000 (china supercritical water reactor, 1000MWe) was developed by NPIC, as BWR, the pressure vessel's reactor and directly circulate loop was adopted, however, the coolant will encounter double flow pass in the reactor. The passive engineering safety feature was adopted and the reactor residual heat will be removed by natural circulation of coolant. As above character, loss of feed water or loss of offsite power will cause completely loss of forced flow accident, the flow in first pass of core will encounter flow inversion during this course, these factor make the LOFA(Loss Of forced Flow Accident) become one of the most limiting accident in CSR1000. The LOFA was analyzed by APROS. The result shows, during the short time of LOFA, the passive operation of HFT will mitigate the accident, and during long term, the passive residual heat removal system will function and maintain the core within the safety state. © 2018 American Nuclear Society. All rights reserved.

关键词： Coolants

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A Coumarin-Thiazolidine Based Theranostic Fluorescent Probe with Divergent Fluorescence Responses for Cu（Ⅱ）,Hg（Ⅱ）,and Ag（Ⅰ） ions,and a Case Study of a Self-Threshold Fluorescent Probe

A Coumarin-Thiazolidine Based Theranostic Fluorescent Probe ...

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第十一届全国化学生物学学术会议

作者： Junwei Chen Na Wang Huan Xu Chao Song Yajun Zhang Feng Gao Kaiyan Lou Wei Wang State Key Laboratory of Bioengineering Reactor Shanghai Key Laboratory of New Drug Designand Shanghai Key Laboratory of Chemical BiologySchool of PharmacyEast China University of Science & Technology

Facile detection, differentiation, and detoxification of multiple heavy metal ions in a simple molecule design presents an ultimate challenge.[1] Here we reported a coumarin-thiazolidine based theranostic fluorescent probe 1（R=Et） with two latent metal ion binding sites and two distinctive hydrolysis sites which are promoted by metal-ion-complexation for achieving divergent fluorescence responses for the three heavy metal ions: an "on-off" response for Ag+, an "off-on" response for Hg2+, and a self-threshold ratiometric fluorescence response for Cu2+. The probe 1 also showed cell-protective effects comparable to D-penicillamine against Ag+, Cu2+, or Hg2+-induced cytotoxicity in MCF-7 cells.[2] By studying the fluorescence response and mechanism of the probe for Cu2+, we proposed a new concept of "self-threshold fluorescent probe" in fluorescent probe design. Such a probe gives cut-out fluorescence readout when the concentration of the analyte of interest above a certain threshold that is dependent on the probe’s concentration. The key to the self-threshold fluorescent probe design is the sequential binding of two different binding sites with differentiable fluorescence readout. Such a self-threshold fluorescent probe is particularly useful for determining whether concentration of the analyte of interest is over a certain limit or not. [2] Moreover, we also find that allosteric effect may also contribute to the sequential binding of the Cu2+ and the self-threshold fluorescence readout. [2]

关键词： fluorescent probe heavy metal ion detoxification threshold allosteric effect

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