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Bioinspired Double-stranded Yarn with Alternating Hydrophobic/Hydrophilic Patterns for High-efficiency Fog Collection

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Chinese Journal of Polymer Science 2024年第7期42卷 968-975,I0008页

作者： Lan-Lan Hou Meng-Na Qiu Ya-Qiong Wang Tong-Hua Bai Zhi-Min Cui Jing-Chong Liu Ying-Qun Qi Nü Wang Yong Li Yong Zhao beijing institute of graphic communication Beijing102600China Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of education Beijing Key Laboratory of Bioinspired Energy Materials and DevicesSchool of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing100191China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China beijing Key Laboratory for Bioengineering and Sensing TechnologyDaxing Research InstituteSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing100083China

Efforts to develop innovative water harvesting strategies offer powerful solutions to alleviate the water crisis,especially in remote and arid *** by the hydrophobic/hydrophilic pattern of desert beetles and water self-propulsion property of spider silks,a double-strand hydrophobic PVDF-HFP/hydrophilic PAN nanofibers yarn is proposed by electrospinning and twisting *** double-strand cooperation approach allows for water deposition on hydrophobic PVDF-HFP segment and transport under the asymmetric capillary driving force of hydrophilic PAN segment,thus speeded up the aggregation and growth of *** effects of the composition and the diameter ratio of the two primary yarns were studied and optimized for boosting fog collection *** double-strand anisotropic yarn not only provide an effective method for water harvesting,but also hold the potential to inspire innovative design concepts for fog collection materials in challenging environments.

关键词： Fog collection Wettability Electrospinning Nanofibers Spider silk

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Ultrasonic characterization of modified Cr_2O_3 coatings by reflection coefficient spectroscopy

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Transactions of Nonferrous Metals Society of China 2010年第3期20卷 418-424页

作者：李继承林莉李喜孟李光雷明凯 Nondestructive Testing and Evaluation Laboratory School of Materials Science and EngineeringDalian University of Technology Department of Mechanical Engineering Beijing Institute of Graphic Communication Surface Engineering Laboratory School of Materials Science and EngineeringDalian University of Techno logy

Pores,microcracks and density of plasma sprayed Cr2O3 coatings before and after high-intensity pulsed ion beam(HIPIB) irradiation were investigated using the ultrasonic reflection coefficient spectroscopy(URCS).The URCS was analyzed based on an acoustic transmission model for the multi-layered *** longitudinal velocity in the coatings was calculated from the experimental URCS,and the attenuation coefficient expression was deduced by comparing the experimental and numerical fitting amplitude spectral *** longitudinal velocity of as-sprayed Cr2O3 coating is 2 002 m/s,and increases to 2 099 and 2 148 m/s after being irradiated by HIPIB with 1 and 5 ***,the factor A changes from 0.046 to 0.026 and 0.020 and n from 1.702 to 1.658 and 1.649 in the attenuation coefficient expression of α=Af *** is observed that the surface morphology of Cr2O3 coatings changes from rough and porous to smooth and uniform with the increase of shot number,which accords with the ultrasonic analyses *** URCS seems to provide a convenient and nondestructive method to characterize surface modification of the plasma sprayed coatings.

关键词： ultrasonic characterization Cr2O3 coating high-intensity pulsed ion beam ultrasonic reflection coefficient attenuation coefficient

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Rotation-translation coupling of a double-headed Brownian motor in a traveling-wave potential

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Frontiers of physics 2021年第3期16卷 165-175页

作者： Wei-Xia Wu Chen-Pu Li Yan-Li Song Ying-Rong Han Zhi-Gang Zheng Science education Department Beijing Institute of Graphic CommunicationBeijing102600China College of Science Hebei University of ArchitectureZhangjiakou075000China school of Science Tianjin UniversityTianjin300072China school of Science Hebei University of TechnologyTianjin300401China institute of Systems Science and College of Information Science and Engineering Huaqiao UniversityXiamen361021China

Considering a double-headed Brownian motor moving with both translational and rotational degrees of freedom,we investigate the directed transport properties of the system in a traveling-wave *** is found that the traveling wave provides the essential condition of the directed transport for the system,and at an appropriate angular frequency,the positive current can be optimized.A general current reversal appears by modulating the angular frequency of the traveling wave,noise intensity,external driving force and the rod *** transforming the dynamical equation in traveling-wave potential into that in a tilted potential,the mechanism of current reversal is *** both cases of Gaussian and Lévy noises,the currents show similar dependence on the ***,the current in the tilted potential shows a typical stochastic resonance *** external driving force has also a resonance-like effect on the current in the tilted *** the current in the traveling-wave potential exhibits the reverse behaviors of that in the tilted ***,the currents obviously depend on the stability index of the Lévy noise under certain conditions.

关键词： Brownian motor rotation-translation coupling traveling-wave potential current reversal

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Multiway Dynamic Trust Chain Model on Virtual Machine for Cloud Computing

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China communications 2016年第7期13卷 83-91页

作者： Jie Zhu Guoyuan Lin Fucheng You Huaqun Liu Chunru Zhou school of Computer Science and Technology China University of Mining&TechnologyXuzhou 221116China State Key Laboratory for Novel Software Technology hosted at Nanjing University Nanjing 210093China Information Engineering school of beijing institute of graphic communication Beijing 102600China beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipment Beijing Institute of Graphic CommunicationBeijing 100026China Information Security Center Beijing University of Posts and TelecommunicationsBeijing 100876China Nanjing University of Information Science&Technology Nanjing 210044China

This paper sums up four security factors after analyzing co-residency threats caused by the special multitenant environment in the *** secure the factors,a multiway dynamic trust chain transfer model was proposed on the basis of a measurement interactive virtual machine and current behavior to protect the integrity of the system.A trust chain construction module is designed in a virtual machine *** dynamic monitoring,it achieves the purpose of transferring integrity between virtual machine.A cloud system with a trust authentication function is implemented on the basis of the model,and its practicability is shown.

关键词： cloud computing virtual machine trustworthiness measurement dynamic trust transfer

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Simulation and Research of Register Control System Based on Sliding Mode Variable Structure

Simulation and Research of Register Control System Based on ...

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第25届中国控制与决策会议

作者： Mei Yang Shaoru Zhang school of Information and Mechanical Engineering Beijing Institute of Graphic Communication College of Physics Science and Information Engineering Hebei Normal University

ISBN: (纸本)9781467355339

Based on analyzing the shaftless multiple unit web press experiment platform, a precise color-alignment mathematical model was established in order to characterize register system and control it. A register control simulation system was constructed in MATLAB which actuator was a permanent magnet synchronous motor. Considering the nonlinear of servo motor, a sliding mode variable structure controller was designed. The system with different error input signal was simulated and the results proposed sliding mode control strategy can improve the robustness of the register control system. Multi-axis registering operation of web press has been discussed and simulated, which made the simulation model be more close to the real web register system. A more precise and convenient simulation platform for bringing the advance control strategy to register system of web press was built.

关键词： Sliding Mode Control Register System Simulation

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A Fast Two-Stage Black-Box Deep Learning Network Attacking Method Based on Cross-Correlation

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Computers, Materials & Continua 2020年第7期64卷 623-635页

作者： Deyin Li Mingzhi Cheng Yu Yang Min Lei Linfeng Shen State Key Laboratory of Public Big Data Guizhou UniversityGuiyang550025China school of Cyberspace Security Beijing University of Posts and TelecommunicationsBeijing100876China College of New Media Beijing Institute of Graphic CommunicationBeijing102600China school of Computing Science Simon Fraser UniversityBurnabyCanada

Deep learning networks are widely used in various systems that require ***,deep learning networks are vulnerable to adversarial *** study on adversarial attacks plays an important role in ***-box attacks require less knowledge about target models than white-box attacks do,which means black-box attacks are easier to launch and more ***,the state-of-arts black-box attacks still suffer in low success rates and large visual distances between generative adversarial images and original *** paper proposes a kind of fast black-box attack based on the cross-correlation(FBACC)*** attack is carried out in two *** the first stage,an adversarial image,which would be missclassified as the target label,is generated by using gradient descending *** far the image may look a lot different than the original ***,in the second stage,visual quality keeps getting improved on the condition that the label keeps being *** using the cross-correlation method,the error of the smooth region is ignored,and the number of iterations is *** with the proposed black-box adversarial attack methods,FBACC achieves a better fooling rate and fewer *** attacking LeNet5 and AlexNet respectively,the fooling rates are 100%and 89.56%.When attacking them at the same time,the fooling rate is 69.78%.FBACC method also provides a new adversarial attack method for the study of defense against adversarial attacks.

关键词： Black-box adversarial attack cross-correlation two-module

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Privacy Protection Algorithm for the Internet of Vehicles Based on Local Differential Privacy and Game Model

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Computers, Materials & Continua 2020年第8期64卷 1025-1038页

作者： Wenxi Han Mingzhi Cheng Min Lei Hanwen Xu Yu Yang Lei Qian Guizhou Provincial Key Laboratory of Public Big Data Guizhou UniversityGuiyang550025China school of Cyberspace Security Beijing University of Posts and TelecommunicationsBeijing100876China College of New Media Beijing Institute of Graphic CommunicationBeijing102600China school of Computer Science The University of AucklandAucklandNew Zealand

In recent years,with the continuous advancement of the intelligent process of the Internet of Vehicles(IoV),the problem of privacy leakage in IoV has become increasingly *** research on the privacy protection of the IoV has become the focus of the *** paper analyzes the advantages and disadvantages of the existing location privacy protection system structure and algorithms,proposes a privacy protection system structure based on untrusted data collection server,and designs a vehicle location acquisition algorithm based on a local differential privacy and game *** algorithm first meshes the road network ***,the dynamic game model is introduced into the game user location privacy protection model and the attacker location semantic inference model,thereby minimizing the possibility of exposing the regional semantic privacy of the k-location set while maximizing the availability of the *** this basis,a statistical method is designed,which satisfies the local differential privacy of k-location sets and obtains unbiased estimation of traffic density in different ***,this paper verifies the algorithm based on the data set of mobile vehicles in *** experimental results show that the algorithm can guarantee the user’s location privacy and location semantic privacy while satisfying the service quality requirements,and provide better privacy protection and service for the users of the IoV.

关键词： The Internet of Vehicles privacy protection local differential privacy location semantic inference attack game theory

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Markov Chain Model For the Structure of the Traditional Publishing Industry in China

Markov Chain Model For the Structure of the Traditional Publ...

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2013年教育技术与管理科学国际会议

作者： Eryan Zhang Xiaofeng Zhu Department of basic Courses beijing institute of graphic communication

In order to analyze the structural change of the traditional publishing industry in China, the prediction technique of Markov Chain is applied to conduct research on the prediction problem of the structure of the traditional publishing industry China, and the estimation model of Markov matrix of state transition probability is provided as well. The conclusion shows that the prediction accuracy of the prediction technique is quite high after the error of simulated result has been tested. The prediction technique is applied to forecast the structure of the traditional publishing industry in China from 2012 to 2016. The application of Markov Chain prediction model in forecasting the structural change trend of the traditional publishing industry in China has greatly expanded the fields where the prediction technique of Markov Chain can be put into practice, and the data about the structural transition of the traditional publishing industry in China can hopefully offer a new perspective on looking into and solving issues to ensure the healthy and sound development of China’s changing publishing industry.

关键词： traditional publishing industry OLS estimation Markov Chain the quadratic programming model transition probability matrix

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Dependence of elastic strain field on the self-organized ordering of quantum dot superlattices

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Journal of University of Science and Technology beijing 2007年第5期14卷 477-481页

作者： Yumin Liu Zhongyuan Yu Yongzhen Huang school of Science Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of the Ministry of education of China for Optical communication and Lightwave Technologies Beijing 100876 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Science Beijing 100083 China

A systematic investigation of the strain distribution of self-organized, lens-shaped quantum dot in the case of groffth direction on （001） substrate was presented. The three-dimensional finite element analysis for an array of dots was used for the strain calculation. The dependence of the strain energy density distribution on the thickness of the capping layer was investigated in detail when the elastic characteristics of the matrix material were anisotropic. It is shown that the elastic anisotropic greatly influences the stress, strain, and strain energy density in the quantum dot structures. The anisotropic ratio of the matrix material and the combination with different thicknesses of the capping layer, may lead to different strain energy density minimum locations on the capping layer surface, which can result in various vertical ordering phenomena for the next layer of quantum dots, i.e. partial alignment, random alignment, and complete alignment.

关键词： quantum dot self-organization elastic strain field superlattice

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Lightweight authentication scheme for edge control systems in Industrial Internet of Things

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Frontiers of Information Technology & Electronic Engineering 2024年第11期25卷 1466-1478页

作者： Wenli SHANG Xudong WEN Zhuo CHEN Wenze XIONG Zhiwei CHANG Zhong CAO school of Electronics and communication Engineering Guangzhou UniversityGuangzhou 510006China Instrumentation Technology and Economy institute Beijing 100055China

In edge control systems(ECSs),edge computing demands more local data processing power,while traditional industrial programmable logic controllers(PLCs)cannot meet this ***,edge intelligent controllers(EICs)have been developed,making their secure and reliable operation ***,as EICs communicate sensitive information with resource-limited terminal devices(TDs),a low-cost,efficient authentication solution is urgently needed since it is challenging to implement traditional asymmetric cryptography on *** this paper,we design a lightweight authentication scheme for ECSs using low-computational-cost hash functions and exclusive OR(XOR)operations;this scheme can achieve bidirectional anonymous authentication and key agreement between the EIC and TDs to protect the privacy of the *** security analysis,we demonstrate that the authentication scheme can provide the necessary security features and resist major known *** analysis and comparisons indicate that the proposed authentication scheme is effective and feasible for deployment in ECSs.

关键词： Edge intelligent controller(EIC) Edge control systems(ECSs) Terminal devices(TDs) Anonymous authentication Lightweight authentication

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