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Eavesdropping Area for Evaluating the Security of Wireless Communications

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China Communications 2022年第3期19卷 145-157页

作者： xiaofeng zhong Chenchen Fan Shidong Zhou Tsinghua University Beijing National Research Center for Information Science and Technology Department of Electronic Engineering Tsinghua UniversityBeijing 100084China

Compared with wired communication,the wireless communication link is more vulnerable to be attacked or eavesdropped because of its broadcast *** prevent eavesdropping,many researches on transmission techniques or cryptographic methods are carried *** paper proposes a new index parameter named as eavesdropping area,to evaluate the anti-eavesdropping performance of wireless *** the locations of legitimate transmitter and receiver,eavesdropping area index describes the total area of eavesdropping regions where messages can be wiretapped in the whole evaluating *** paper gives detailed explanations about its concept and deduces mathematical formulas about performance curves based on region *** key system parameters are analyzed,including the characteristics of eavesdropping region,transmitted beam pattern,beam direction,receiver sensitivity,eavesdropping sensitivity,path loss exponent and so *** proposed index can give an insight on the confirmation of high-risk eavesdropping region and formulating optimal transmitting scheme for the confidential communications to decrease the eavesdropping probability.

关键词： eavesdropping area wireless communication anti-eavesdropping performance transmitting scheme

A Numerical Modeling of the Vortex-induced Vibration of Cascade in Turbomachinery using Immersed Boundary Method

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Journal of Thermal Science 2011年第3期20卷 229-237页

作者： Guotun Hu Lin Du Guohua zhong xiaofeng Sun School of Jet Propulsion Beihang University Beijing 100191 China

Based on the immersed boundary method,a fast simulation for solving unsteady,incompressible,viscous flow associated with the oscillating cascade is established on a quasi-three-dimensional coordinate *** numerical method is applied to the simulation of the flow passing an oscillating circular cylinder which is forced to move in X direction under prescribed motions in water at rest at low Keulegan-Carpenter *** vor-tex-induced vibration of a cylinder with two degrees of freedom which oscillates in in-line direction and transverse direction is simulated using this *** results are in good agreement with the previous *** the method is extended to the oscillating cascade simulation of making various *** is found that the IBPA(inter blade phase angle) will change as the time goes on,because of the non-uniformity of the flow in the circumferential direction,until the oscillating cascade goes to a stable *** reduced velocity and the number of blades are chosen to investigate the effects of them on *** results indicate that both the reduced velocity and the number of blades are the main factors which influence *** is worth noting that the coupling process is not necessary to generate any body-fitting grids,which makes it much faster in computational process for such a complicated fluid-structure interaction problem.

关键词： turbomachinery IB method vortex-induced vibration oscillating cascade

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我国瓦斯隧道施工技术进展及主要问题探讨

隧道建设（中英文） 2024年第1期44卷 53-68页

作者：黄飞钟小凤罗太友李树清罗亚飞刘磊龙其毕湖南科技大学资源环境与安全工程学院湖南湘潭411201 湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室湖南湘潭411201 贵阳景烁安全科技有限公司贵州贵阳550081

基于网络数据资料、期刊论著文献与现场施工资料,全面总结我国瓦斯隧道施工技术的进展与不足。结果表明:1)我国瓦斯隧道具有瓦斯工区里程长、瓦斯等级高、多分布于中西部地区等特征;2)瓦斯隧道施工灾害主要为瓦斯燃烧、瓦斯爆炸、瓦斯... 详细信息

基于网络数据资料、期刊论著文献与现场施工资料,全面总结我国瓦斯隧道施工技术的进展与不足。结果表明:1)我国瓦斯隧道具有瓦斯工区里程长、瓦斯等级高、多分布于中西部地区等特征;2)瓦斯隧道施工灾害主要为瓦斯燃烧、瓦斯爆炸、瓦斯突出、瓦斯中毒窒息等事故,年事故发生数量总体呈下降趋势;3)我国瓦斯隧道设计施工规范近20年来得到了较为全面的完善,已颁布了铁路与公路行业标准、贵川渝等地方标准;4)隧道瓦斯工区安全施工主要依赖于超前探测、瓦斯监测、安全通风与揭煤防突等关键技术,在工程实践中各技术的关键施工参数得到了优化完善;5)绝对瓦斯涌出量测定方法与瓦斯工区等级动态调整机制是目前瓦斯隧道施工存在的主要问题,对瓦斯隧道的施工安全与成本控制影响巨大。建议根据隧道施工特征进一步开展隧道瓦斯防治专题研究,完善瓦斯隧道设计施工规范,为我国瓦斯隧道的安全高效施工提供理论与技术支撑。

关键词：瓦斯隧道通风揭煤防突瓦斯工区等级评价动态调整机制

A Genetic Pathway for Tapetum Development and Function in Arabidopsis

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Journal of Integrative Plant Biology 2011年第11期53卷 892-900页

作者： Jun Zhu Yue Lou xiaofeng Xu zhong-Nan Yang College of Life and Environmental Sciences Shanghai Normal University Shanghai 200234 China

In anther development, tapetal cells take part in complex processes, including endomitosis and apoptosis （programmed cell death）. The tapetum provides many of the proteins, lipids, polysaccharides and other molecules necessary for pollen development. Several transcription factors, including DYT1, TDF1, AMS, MS188 and MS1, have been reported to be essential for tapetum development and function in Arabidopsis thaliana. Here, we present a detailed cytological analysis of knockout mutants for these genes, along with an in situ RNA hybridization experiment and double mutant analysis showing that these transcription factors form a genetic pathway in tapetum development. DYT1, TDF1 and AMS function in early tapetum development, while MS188 and MS1 are important for late tapetum development. The genetic pathway revealed in this work facilitates further investigation of the function and molecular mechanisms of tapetum development in Arabidopsis.

关键词： anther development genetic pathway pollen development tapetum transcription factor DYT1 TDF1 AMS MS188 MS1.

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GUEST EDITORIAL

China Communications 2022年第3期19卷 129-131页

作者： Depeng Jin Xiaoming Tao xiaofeng zhong Jintao Wang Department of Electronic Engineering Tsinghua University Department Council Electronic Engineering Dept. Tsinghua Univ Department of Electronic Engineering at Tsinghua University Department of Electronic Engineering at Tsinghua University

AI-Empowered Future Communication Networks Recently, the fifth-generation(5G) of wireless network has been developed to support enhanced mobile broadband(eMBB), massive machine-type communications(mMTC) and ultra-reliable and low-latency communications(uRLLC). However, with the tremendous increase of data services,

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On opportunistic spectrum efficiency in cognitive radio systems

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High Technology Letters 2009年第2期15卷 170-174页

作者：王鹏 zhong xiaofeng Xiao Limin Zhou Shidong Wang Jing Bai Yong State Key Laboratory on Microwave and Digital Communications Tsinghna National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing 100084 P.R. China DoCoMo Beijing Communications Laboratories Compary Limited Beijing 100080 P.R. China

The performance bound of cognitive radio systems is *** use opportunistic spectrum effi-ciency(OSE)as the performance metric,and point out that the maximum achievable OSE can be used toevaluate the maximum value that the introduction of secondary users can add to the conventional *** on assumptions of the PU s traffic model and some reasonable approximations,the ex-pression of OSE is obtained and the maximum achievable OSE is derived by solving an optimization *** results are verified by computer simulation.

关键词： cognitive radio opportunistic spectrum access opportunistic spectrum efficiency

Naked-eye visualization of lymph nodes using fluorescence nanoprobes in non-human primate-animal models

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Nano Research 2024年第8期17卷 7404-7414页

作者： Xiaoyuan Ji Binbin Chu xiaofeng Wu Zhiming Xia Airui Jiang Chenyu Wang Zhiming Chen Danni zhong Qiaolin Wei Bin Song Wanlin Li Yiling zhong Houyu Wang Fenglin Dong Min Zhou Yao He Suzhou Key Laboratory of Nanotechnology and Biomedicine Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesInstitute of Functional Nano and Soft Materials(FUNSOM)Soochow UniversitySuzhou 215123China School of Public Health Shanghai Jiao Tong University School of MedicineShanghai 200025China Zhejiang University-University of Edinburgh Institute(ZJU-UoE Institute) Zhejiang UniversityHaining 314400China Department of Ultrasound the First Affiliated Hospital of Soochow UniversitySuzhou 215006China State Key Laboratory(SKL)of Biobased Transportation Fuel Technology Zhejiang UniversityHangzhou 310027China School of Pharmacy Hangzhou Normal UniversityHangzhou 311121China Macao Translational Medicine Center Macao University of Science and TechnologyTaipa 999078MacaoChina Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina

Despite sufficient studies performed in non-primate animal models,there exists scanty information obtained from pilot trials in non-human primate animal models,severely hindering nanomaterials moving from basic research into clinical *** herein present a pioneering demonstration of nanomaterials based optical imaging-guided surgical operation by using macaques as a typical kind of non-human primate-animal ***,taking advantages of strong and stable fluorescence of the small-sized(diameter:~5 nm)silicon-based nanoparticles(SiNPs),lymphatic drainage patterns can be vividly visualized in a real-time manner,and lymph nodes(LN)are able to be sensitively detected and precisely excised from small animal models(e.g.,rats and rabbits)to non-human primate animal models(e.g.,cynomolgus macaque(Macaca fascicularis)and rhesus macaque(Macaca mulatta)).Compared to clinically used invisible near-infrared(NIR)lymphatic tracers(i.e.,indocyanine green(ICG);etc.),we fully indicate that the SiNPs feature unique advantages for naked-eye visible fluorescence-guided surgical operation in long-term *** toxicological analysis in macaque models further provides confirming evidence of favorable biocompatibility of the SiNPs *** expect that our findings would facilitate the translation of nanomaterials from the laboratory to the clinic,especially in the field of cancer treatment.

关键词： fluorescent silicon nanoparticles lymph node real-time naked-eye visualization macaque models

The Magnaporthe oryzae effector Avr-PikD suppresses rice immunity by inhibiting an LSD1-like transcriptional activator

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The Crop Journal 2024年第2期12卷 482-492页

作者： Jiayuan Guo Yiling Wu Jianqiang Huang Kaihui Yu Meilian Chen Yijuan Han Zhenhui zhong Guodong Lu Yonghe Hong Zonghua Wang xiaofeng Chen Fujian Universities Engineering Research Center of Marine Biology and Drugs Fuzhou Institute of OceanographyCollege of Geography and OceanographyMinjiang UniversityFuzhou 350108FujianChina Rice Research Institute Fujian Academy of Agricultural SciencesFuzhou 350018FujianChina Ministerial and Provincial Joint Innovation Center for Safety Production of Cross-Strait Crops Minjiang UniversityFuzhou 350108FujianChina State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhou 350002FujianChina

Avirulence effectors(Avrs),encoded by plant pathogens,can be recognized by plants harboring the corresponding resistance proteins,thereby initiating effector-triggered immunity(ETI).In susceptible plants,however,Avrs can function as effectors,facilitating infection via effector-triggered susceptibility(ETS).Mechanisms of Avr-mediated ETS remain largely *** we report that the Magnaporthe oryzae effector Avr-PikD enters rice cells via the canonical cytoplasmic secretion pathway and suppresses rice basal ***-PikD interacts with an LSD1-like transcriptional activator AKIP30 of rice,and AKIP30 is also a positive regulator of rice immunity,whereas Avr-PikD impedes its nuclear localization and suppresses its transcriptional *** summary,*** delivers Avr-PikD into rice cells to facilitate ETS by inhibiting AKIP30-mediated transcriptional regulation of immune response against ***.

关键词： Magnaporthe oryzae Avirulence effector Avr-PikD Effector-triggered susceptibility Rice immunity Transcriptional activator

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三维虚拟骨干网络算法优化

清华大学学报（自然科学版） 2008年第4期48卷 549-552页

作者：张昊钟晓峰王京清华大学电子工程系微波与数字通信技术国家重点实验室北京100084

由于ad hoc网络的实际应用环境多数为三维空间,该文将二维平面虚拟骨干算法推广到三维空间。首先利用图论中连通支配节点集(CDS)的概念,给出三维空间中虚拟骨干网络成形算法。然后通过推导给出该算法生成的三维虚拟骨干网络保持二维平... 详细信息

由于ad hoc网络的实际应用环境多数为三维空间,该文将二维平面虚拟骨干算法推广到三维空间。首先利用图论中连通支配节点集(CDS)的概念,给出三维空间中虚拟骨干网络成形算法。然后通过推导给出该算法生成的三维虚拟骨干网络保持二维平面中传输跳数稀疏比率为3,链路长度稀疏比率为6的性质,以及该算法所构建的连通支配节点集(CDS)的节点数目与理论最优数目的比率上限为16的结论。并通过大规模的随机仿真实验,验证了三维虚拟骨干网络算法的性能。

关键词：三维空间虚拟骨干网络连同支配节点集

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