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Building Simulation 2022年第4期15卷 525-536页

作者： Haihang Li fei tang Safety Engineering Institute College of Quality and Safety EngineeringChina Jiliang UniversityHangzhouChina State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei230026China

The objective of this study is to investigate critical velocity and smoke maximum temperature beneath the ceiling in the connected area of branch tunnel with varying fire *** fire sources were located in the divergent connected area of the branch tunnel,to imitate traffic accidents near the branch point.A 1/20 scale model branch tunnel was built including main line before branch,main line after branch,and *** tests and numerical simulations were performed to explore smoke movement characteristics with longitudinal *** results showed that the enlarged cross-sectional area in branch tunnel caused the shortening of the back-layering length,and a modified model of back-layering length was *** higher tunnel height in this work affected the critical condition of large fire;it caused a larger transition point of dimensionless critical velocity.A revised model was proposed for the maximum temperature rise of tunnel fires in the connected area of branch *** critical velocity kept unchanged when the branch angle increased from 0°to 20°because there is little change in the longitudinal smoke *** the local tunnel width of fire source was increased,the required critical velocity was increased while the local effective velocity kept nearly the same.

关键词： tunnel fire critical velocity maximum temperature dimensionless back-layering length branch tunnel

Liquid Water Path Retrieval Using the Lowest Frequency Channels of Fengyun-3C Microwave Radiation Imager(MWRI)

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Journal of Meteorological Research 2017年第6期31卷 1109-1122页

作者： fei tang Xiaolei ZOU Joint Center of Data Assimilation for Research and Application College of Atmospheric ScienceNanjing University of Information Science &Technology State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological Administration Earth System Science Interdisciplinary Center University of Maryland College Park

The Microwave Radiation Imager （MWRI） on board Chinese Fengyun-3 （FY-3） satellites provides measurements at 10.65, 18.7, 23.8, 36.5, and 89.0 GHz with both horizontal and vertical polarization channels. Brightness temperature measurements of those channels with their central frequencies higher than 19 GHz from satellite-based microwave imager radiometers had traditionally been used to retrieve cloud liquid water path （LWP） over ocean. The results show that the lowest frequency channels are the most appropriate for retrieving LWP when its values are large. Therefore, a modified LWP retrieval algorithm is developed for retrieving LWP of different magnitudes involving not only the high frequency channels but also the lowest frequency channels of FY-3 MWRI. The theoretical estimates of the LWP retrieval errors are between 0.11 and 0.06 mm for 10.65- and 18.7-GHz channels and between 0.02 and 0.04 mm for 36.5- and 89.0-GHz channels. It is also shown that the brightness temperature observations at 10.65 GHz can be utilized to better retrieve the LWP greater than 3 mm in the eyewall region of Super Typhoon Neoguri （2014）. The spiral structure of clouds within and around Typhoon Neoguri can be well captured by combining the LWP retrievals from different frequency channels.

关键词： microwave remote sensing Fengyun-3C Microwave Radiation Imager (MWRI) liquid water path (LWP) retrieval

Privacy-preserving authentication scheme based on zero trust architecture

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Digital Communications and Networks 2024年第5期10卷 1211-1220页

作者： fei tang Chunliang Ma Kefei Cheng College of Computer Science and Technology Chongqing University of Posts and Telecommunications School of Cyber Security and Information Law Chongqing University of Posts and Telecommunications

Zero trust architecture is an end-to-end approach for server resources and data security which contains identity authentication,access control,dynamic evaluation,and so *** work focuses on authentication technology in the zero trust *** this paper,a Traceable Universal Designated Verifier Signature(TUDVS) is used to construct a privacy-preserving authentication scheme for zero trust ***,when a client requests access to server resources,we want to protect the client's access privacy which means that the server administrator cannot disclose the client's access behavior to any third *** addition,the security of the proposed scheme is proved and its efficiency is ***,TUDVS is applied to the single packet authorization scenario of the zero trust architecture to prove the practicability of the proposed scheme.

关键词： Zero trust architecture Privacy-preserving Authentication Anonymity revocation

Attribute-based non-interactive key exchange

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Science China(Information Sciences) 2017年第1期60卷 208-210页

作者： fei tang Rui ZHANG Hongda LI College of Computer Science and Technology Chongqing University of Posts and Telecommunications State Key Laboratory of Information Security Institute of Information Engineering of Chinese Academy of Sciences

Dear editor,In this work,we study the notion of attributebased non-interactive key-exchange(ABNIKE).As a natural extension of the notions of non-interactive key-exchange(NIKE)[1,2]and identity-based non-interactive key-exchange(IBNIKE)[3,4],ABNIKE allows users to noninteractively agree on a common shared *** from attribute-based encryption[5],we divide ABNIKE into two forms:key-policy ABNIKE(KP-ABNIKE)and shared-key-policy

关键词： PRF AB NIKE Attribute-based non-interactive key exchange

Synthesis, Crystal Structure and Characterization of a One-dimensional Supramolecular Rare Earth Complex of N-(6-(4-Methylpyridinyl))ketoacetamide

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Chinese Journal of Structural Chemistry 2007年第8期26卷 877-882页

作者： XU Li tang Kuan-Zhen MA Yu-fei tang Yu TAN Min-Yu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China

A one-dimensional （1D） supramolecular rare earth complex [Nd（NO3）2L2-（C3H6O）][NdL（NO3）4]} （L=N-（6-（4-methylpyridinyl））ketoacetamide） has been prepared and characterized by elemental analysis, IR and electronic spectroscopy, and single-crystal X-ray diffraction. The crystal crystallizes in the triclinic system, space group P1^- with a=0.9146（6）, b=1.2581（8）, c=2.2316（14） nm, α=99.352（10）,β=97.209（9）, γ=103.935（9）°, V=2.422（3） nm3, Dc=1.776 g/cm^3, C33H42N12Nd2O25, Mr=1295.27, Z=2, F（000）=1288, μ=2.217 mm-1, R=0.0508and wR=0.1046 for 5173 observed reflections （I 〉 2σ（I））. In the structure of the title complex,one-dimensional supramolecular double-chains are formed by intermolecular hydrogen bonding interactions.

关键词： crystal structure rare earth nitrate β-diketone complex supramolecular network

A New Method for Improving Strength and Plasticity of Steel Wire

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Journal of Materials Science & Technology 2007年第2期23卷 273-276页

作者： fei DING Guoyi tang Zhuohui XU Shaoquan TIAN Advanced Materials Institute Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

Specially designed wire-drawing equipment with multiple electropulse generator was introduced. The influences of multiple electropulses processing on the microstructure and properties of the hardened steel wire were investigated. Samples treated by direct current under the same current density as that in multiple electropulses processing were carried out for contrast analysis. The results show that the optimized parameters of multiple electropulses processing will be facilitated to increase the nucleation rate and slow down the growth rate of recrystallized grains. Consequently, massive superfine grains of micro and sub-micro scale could be found in the steel wire. Thereby, the elongation was significantly enhanced with a relatively small strength reduction in comparison with as-received cold-drawing steel wires. Outstanding mechanical properties of steel wire were obtained.

关键词： Multiple electropulses Wire-drawing Recrystallization Superfine grain Mechanical properties

Authentication scheme for industrial Internet of things based on DAG blockchain

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The Journal of China Universities of Posts and Telecommunications 2021年第6期28卷 1-12页

作者： tang fei Dong Kun Ye Zhangtao Ling Guowei College of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Cyber Security and Information Law Chongqing University of Posts and TelecommunicationsChongqing 400065China

Internet of things(IoT) can provide the function of product traceability for industrial systems. Emerging blockchain technology can solve the problem that the current industrial Internet of things(IIoT) system lacks unified product data sharing services. Blockchain technology based on the directed acyclic graph(DAG) structure is more suitable for high concurrency environments. But due to its distributed architecture foundation, direct storage of product data will cause authentication problems in data management. In response, IIoT based on DAG blockchain is proposed in this paper, which can provide efficient data management for product data stored on DAG blockchain, and an authentication scheme suitable for this structure is given. The security of the scheme is based on a discrete-logarithm-based assumption put forth by Lysyanskaya, Rivest, Sahai and Wolf(LRSW) who also show that it holds for generic groups. The sequential aggregation signature scheme is more secure and efficient, and the new scheme is safe in theory and it is more efficient in engineering.

关键词： industrial Internet of things(IIoT) blockchain directed acyclic graph(DAG) aggregation signature

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IHVFL: a privacy-enhanced intention-hiding vertical federated learning framework for medical data

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Cybersecurity 2024年第2期7卷 96-112页

作者： fei tang Shikai Liang Guowei Ling Jinyong Shan College of Computer Science and Technology Chongqing University of Posts and TelecommunicationsNo.2Chongwen RoadNan'an DistrictChongqing 400065China School of Cyber Security and Information Law Chongqing University of Posts and TelecommunicationsChongqing 400065China sudo Technology Co. LTD.Beijing 100083China

Vertical Federated Learning(VFL)has many applications in the field of smart healthcare with excellent ***,current VFL systems usually primarily focus on the privacy protection during model training,while the preparation of training data receives little *** real-world applications,like smart healthcare,the process of the training data preparation may involve some participant's intention which could be privacy information for this *** protect the privacy of the model training intention,we describe the idea of Intention-Hiding Vertical Feder-ated Learning(IHVFL)and illustrate a framework to achieve this privacy-preserving ***,we construct two secure screening protocols to enhance the privacy protection in feature ***,we implement the work of sample alignment bases on a novel private set intersection ***,we use the logistic regression algorithm to demonstrate the process of *** show that our model can perform better efficiency(less than 5min)and accuracy(97%)on Breast Cancer medical dataset while maintaining the intention-hiding goal.

关键词： Medical data Vertical federated learning Privacy-presserving Intention-hiding Logistic regression

Preparation of AlN thin films for film bulk acoustic resonator application by radio frequency sputtering

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 464-470页

作者： Kan LI Hao JIN De-miao WANG Yi-fei tang Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

Aluminum nitride （AlN） thin films with high c-axis orientation have been prepared on a glass substrate with an Al bottom electrode by radio frequency （RF） reactive magnetron sputtering. Based on the analysis of Berg＇s hysteresis model, the improved sputtering system is realized without a hysteresis effect. A new control method for rapidly depositing highly c-axis oriented AlN thin films is proposed. The N2 concentration could be controlled by observing the changes in cathode voltage, to realize the optimum processing condition where the target could be fixed stably in the transition region, and both stoichiometric film composition and a high deposition rate could be obtained. Under a 500 W RF power of a target with a 6 cm diameter, a substrate temperature of 450 ℃, a target-substrate distance of 60 mm and a N2 concentration of 25%, AlN thin film with preferential （002） orientation was deposited at 2.3 μm/h which is a much higher rate than previously achieved. Through X-ray diffraction （XRD） analysis, the full width at half maximum （FWHM） of AlN （002） was shown to be about 0.28°, which shows the good crystallinity and crystal orientation of AlN thin film. With other parameters held constant, any increase or decrease in N2 concentration results in an increase in the FWHM of AlN.

关键词： Aluminum nitride (A1N) Piezoelectric thin film Radio frequency (RF) reactive sputtering Preferred orientation,Film bulk acoustic resonator (FBAR)

Tau Modulates Neurovascular Coupling

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Neuroscience Bulletin 2021年第3期37卷 433-435页

作者： fei tang Qing Wang Jun Guo Peng Lei Department of Neurology and State Key Laboratory of Biotherapy Collaborative Innovation Center for BiotherapyWest China HospitalSichuan UniversityChengdu 610041China

The microtubule-associated protein tau was identified in the neurofibrillary tangles(NFTs)of Alzheimer's disease(AD)more than 30 years ago,and its mutation can directly cause *** implied by its purification from microtubules,tau was thought to stabilize microtubules and therefore to be of crucial importance in the ***,the physiological function of tau is still in debate since there is no detectable deficit in tau-knockout mice until they are 12 months old[1].Recently.

关键词： tau Alzheimer purification