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Secure beamforming and deployment design for rate-splitting multiple access-based UAV communications

Science China(Information Sciences) 2025年第1期68卷 342-356页

作者： bing wang Xiaofeng TAO Shujun HAN Huici WU Kai YANG Zhu HAN National Engineering Research Center of Mobile Network Technologies Beijing University of Posts and Telecommunications Peng Cheng Laboratory Department of Electrical and Computer Engineering University of Houston

Rate-splitting multiple access(RSMA) has recently gained attention as a potential robust multiple access(MA)scheme for upcoming wireless networks. Given its ability to efficiently utilize wireless resources and design interference management strategies, it can be applied to unmanned aerial vehicle(UAV) networks to provide convenient services for large-scale access ground users. However, due to the line-of-sight(LoS) broadcast nature of UAV transmission, information is susceptible to eavesdropping in RSMA-based UAV networks. Moreover, the superposition of signals at the receiver in such networks becomes complicated. To cope with the challenge, we propose a two-user multi-input single-output(MISO) RSMA-based UAV secure transmission framework in downlink communication networks. In a passive eavesdropping scenario, our goal is to maximize the sum secrecy rate by optimizing the transmit beamforming and deployment location of the UAV-base station(UAV-BS),while considering quality-of-service(QoS) constraints, maximum transmit power, and flight space limitations. To address the non-convexity of the proposed problem, the optimization problem is first decoupled into two subproblems. Then, the successive convex approximation(SCA) method is employed to solve each subproblem using different propositions. In addition, an alternating optimization(AO)-based location RSMA(L-RSMA) beamforming algorithm is developed to implement joint optimization to obtain the suboptimal solution. Numerical results demonstrate that(1) the proposed L-RSMA scheme yields a28.97% higher sum secrecy rate than the baseline L-space division multiple access(SDMA) scheme;(2) the proposed L-RSMA scheme improves the security performance by 42.61% compared to the L-non-orthogonal multiple access(NOMA) scheme.

关键词： rate-splitting multiple access UAV communication precoding optimization deployment location physical layer security

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Peripheral blood RNA biomarkers can predict lesion severity in degenerative cervical myelopathy

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Neural Regeneration Research 2025年第6期20卷 1764-1775页

作者： Zhenzhong Zheng Jialin Chen Jinghong Xu Bin Jiang Lei Li Yawei Li Yuliang Dai bing wang Department of Spine Surgery The Second Xiangya Hospital of Central South UniversityChangshaHunan ProvinceChina

Degenerative cervical myelopathy is a common cause of spinal cord injury,with longer symptom duration and higher myelopathy severity indicating a worse *** numerous studies have investigated serological biomarkers for acute spinal cord injury,few studies have explored such biomarkers for diagnosing degenerative cervical *** study involved 30 patients with degenerative cervical myelopathy(51.3±7.3 years old,12 women and 18 men),seven healthy controls(25.7±1.7 years old,one woman and six men),and nine patients with cervical spondylotic radiculopathy(51.9±8.6 years old,three women and six men).Analysis of blood samples from the three groups showed clear differences in transcriptomic *** analysis identified 128 differentially expressed genes that were enriched in patients with neurological *** least absolute shrinkage and selection operator analysis,we constructed a five-gene model(TBCD,TPM2,PNKD,EIF4G2,and AP5Z1)to diagnose degenerative cervical myelopathy with an accuracy of 93.5%.One-gene models(TCAP and SDHA)identified mild and severe degenerative cervical myelopathy with accuracies of 83.3%and 76.7%,*** of two immune cell types(memory B cells and memory-activated CD4^(+)T cells)predicted levels of lesions in degenerative cervical myelopathy with 80%*** results suggest that peripheral blood RNA biomarkers could be used to predict lesion severity in degenerative cervical myelopathy.

关键词： biomarkers candidate genes degenerative cervical myelopathy gene expression analysis immune cell types neurological disabilities peripheral blood RNA profiles spinal cord injury

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Primary investigation on Ram-Rotor Detonation Engine

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Chinese Journal of Aeronautics 2024年第11期37卷 66-80页

作者： Haocheng WEN bing wang School of Aerospace Engineering Tsinghua UniversityBeijing 100084China

The study presents a new type of detonation engine called the Ram-Rotor Detonation Engine(RRDE),which overcomes some of the drawbacks of conventional detonation engines such as pulsed detonation engines,oblique detonation engines,and rotating detonation *** RRDE organizes the processes of reactant compression,detonation combustion,and burned gas expansion in a single rotor,allowing it to achieve an ideal detonation cycle under a wide range of inlet Mach numbers,thus significantly improving the total pressure gain of the propulsion *** feasibility and performance of RRDE are discussed through theoretical analysis and numerical *** theoretical analysis indicates that the performance of the RRDE is mainly related to the inlet velocity,the rotor rim velocity,and the equivalence ratio of *** the inlet velocity leads to a decrease in the total pressure gain of the *** the inlet velocity exceeds the critical value,the engine cannot achieve positive total pressure *** the rim velocity can improve the total pressure gain and the thermodynamic cycle efficiency of *** the equivalence ratio can also improve the thermodynamic cycle efficiency and enhance the total pressure gain at lower inlet *** at higher inlet velocities,increasing the equivalence ratio may reduce the total pressure *** simulations are also performed to analyze the detailed flow field structure in RRDE and its variations with the inlet *** simulation results demonstrate that the detonation wave can stably stand in the RRDE and can adapt to the change of the inlet equivalence ratio within a certain *** study provides the preliminary theoretical basis and design reference for the RRDE.

关键词： Detonation engine Ram-rotor Pressure gain combustion Propulsion performance Thermodynamic cycle efficiency

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Representations and Fusion Rules for the Orbifold Vertex Operator Algebras L_(sl_(2))(k,0)^(Z_(3))

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Algebra Colloquium 2022年第2期29卷 241-264页

作者： bing wang School of Mathematical Sciences Shanghai Jiao Tong University Shanghai 200240China Shanghai Lixin University of Accounting and Finance Shanghai 201209 China

For the cyclic group Z_(3)and a positive integer k,we study the representations of the orbifold vertex operator algebra L_(sl_(2))(k,0)^(Z_(3)).All the irreducible modules for L_(sl_(2))(k,0)^(Z_(3))are classified and... 详细信息

关键词： orbifold vertex operator algebras irreducible modules fusion rules

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Numerical Analysis of a Spiral-groove Dry-gas Seal Considering Micro-scale Effects

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 146-153页

作者： wang bing ZHANG Huiqiang School of Aerospace Tsinghua University Beijing 100064 China Beijing 3E Enemy Key Laboratory Tsinghua University Beijing 100084 China

A dry-gas seal system is a non-contact seal technology that is widely used in different industrial ***-groove dry-gas seal utilizes fluid dynamic pressure effects to realize the seal and lubrication processes,while forming a high pressure gas film between two sealing faces due to the deceleration of the gas pumped in or *** is little research into the effects and the influence on seal performance,if the grooves and the gas film are at the *** paper investigates the micro-scale effects on spiral-groove dry-gas seal performance in a numerical solution of a corrected Reynolds *** Reynolds equation is discretized by means of the finite difference method with the second order scheme and solved by the successive-over-relaxation（SOR） iterative *** Knudsen number of the flow in the sealing gas film is changed from 0.005 to 0.120 with a variation of film depth and sealing *** numerical results show that the average pressure in the gas film and the sealed gas leakage increase due to micro-scale *** open force is enlarged,while the gas film stiffness is significantly decreased due to micro-scale *** friction torque and power consumption remain constant,even in low sealing pressure and spin speed *** this paper,the seal performance at different rotor face spin speeds is also *** proposed research clarifies the micro-scale effects in a spiral-groove dry-gas seal and their influence on seal performance,which is expected to be useful for the improvement of the design of dry-gas seal systems operating in the slip flow regime.

关键词： micro-scale effect spiral-groove dry-gas seal numerical analysis Reynolds equation

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Two-phase micro-and macro-time scales in particle-laden turbulent channel flows

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Acta Mechanica Sinica 2012年第3期28卷 595-604页

作者： bing wang Michael Manhart School of Aerospace Tsinghua University100084 BeijingChina Fachgebiet Hydromechanik Technische Universitait MiinchenD-80290 MfinchenGermany

The micro- and macro-time scales in two-phase turbulent channel flows are investigated using the direct nu- merical simulation and the Lagrangian particle trajectory methods for the fluid- and the particle-phases, respectively. Lagrangian and Eulerian time scales of both phases are cal- culated using velocity correlation functions. Due to flow anisotropy, micro-time scales are not the same with the theo- retical estimations in large Reynolds number （isotropic） tur- bulence. Lagrangian macro-time scales of particle-phase and of fluid-phase seen by particles are both dependent on particle Stokes number. The fluid-phase Lagrangian inte- gral time scales increase with distance from the wall, longer than those time scales seen by particles. The Eulerian inte- gral macro-time scales increase in near-wall regions but de- crease in out-layer regions. The moving Eulerian time scales are also investigated and compared with Lagrangian integral time scales, and in good agreement with previous measure- ments and numerical predictions. For the fluid particles the micro Eulerian time scales are longer than the Lagrangian ones in the near wall regions, while away from the walls the micro Lagrangian time scales are longer. The Lagrangian integral time scales are longer than the Eulerian ones. The results are useful for further understanding two-phase flow physics and especially for constructing accurate prediction models of inertial particle dispersion.

关键词： Micro-time scale Lagrangian integral timescale ~ Moving Eulerian time scale Particle-laden turbulentflow ~ Particle Stokes number Direct numerical simulation(DNS) Lagrangian trajectory method

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Acceleration of DDT by non-thermal plasma in a single-trial detonation tube

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Chinese Journal of Aeronautics 2018年第5期31卷 1012-1019页

作者： Dianfeng ZHENG bing wang College of Engineering Peking University School of Aerospace Engineering Tsinghua University

This paper compares the flame acceleration in single-trial dual-detonation tubes triggered by a spark plug and non-thermal plasma igniter. The low-temperature plasma was generated by an in-house novel AC-driven dielectric barrier discharge igniter, which reduces the power supply requirements and was applied in the quiescent ignition of a single-trial detonation tube. Three different types of detonation mixtures were tested with flame propagation tracked by ion probes and pressure waves recorded by high-frequency pressure transducers. The flame propagation speeds were calculated and compared based on signals from the ion probes. The detonation combustion succeeded in the dual tubes, but the deflagration-to-detonation transition could be significantly accelerated by the plasma for all mixtures, as it was shortened by more than 50% compared to that of the spark plug. The present study provides a suitable technological approach for igniters of PDEs.

关键词： AC driven Deflagration-to-detonation transition Dielectric barrier discharge Non-thermal plasma Pulse detonation engine

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Active Sites for Adsorption and Reaction of Molecules on Rutile TiO2(110) and Anatase TiO2(001) Surfaces

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Shi-jing Tan bing wang Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China

The reactivity of specific sites on rutile TiO2(110)−(1×1) surface and anatase TiO2(001)−(1×4) surface has been comparably studied by means of high resolution scanning tunneling microscopy. At the rutile TiO2(110)−(1×1) surface, we find the defects of oxygen vacancy provide distinct reactivity for O2 and CO2 adsorption, while the terminal fivefold-coordinated Ti sites dominate the photocatalytic reactivity for H2O and CH3OH dissociation. At the anatase TiO2(001)−(1×4) surface, the sixfold-coordinated terminal Ti sites at the oxidized surface seem to be inert in both O2 and H2O reactions, but the Ti-rich defects which introduce the Ti3+ state into the reduced surface are found to provide high reactivity for the reactions of O2 and H2O. By comparing the reactions on both rutile and anatase surfaces under similar experimental conditions, we find the reactivity of anatase TiO2(001) is actually lower than rutile TiO2(110), which challenges the conventional knowledge that the anatase (001) is the most reactive TiO2 surface. Our findings could provide atomic level insights into the mechanisms of TiO2 based catalytic and photocatalytic chemical reactions.

关键词： TiO2 Rutile Anatase Photocatalysis Scanning tunneling microscopy

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Rice geographic adaption to poor soil: novel insights for sustainable agriculture

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Molecular Plant 2021年第3期14卷 369-371页

作者： bing wang Jiayang Li State Key Laboratory of Plant Genomics and National Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyThe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Rice is one of the most important staple crops, feeding more than half of the population on Earth. How to steadily increase yield has been a major challenge in the context of an ever-growing population and climate change. Over the past decades, breeding practices have greatly increased cereal grain yield mainly owing to the adoption of semidwarf alleles and the development of hybrid crop varieties.

关键词： soil breeding crops

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负载纳米钽的液晶显示光固化聚乳酸支架制备及促成骨性能

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中国组织工程研究 2025年第4期29卷 670-677页

作者：李明哲叶翔凌王冰余翔南阳医学高等专科学校针灸骨伤系河南省南阳市473000 广州中医药大学东莞医院广东省东莞市523888 广州中医药大学第一附属医院广东省广州市510405 广东省中医临床研究院广东省广州市510405

背景:聚乳酸因具有良好的生物相容性和可控的降解速率在生物医学工程中得到了广泛应用,然而存在机械强度低和生物活性不足等缺陷,限制了其在骨组织工程中的进一步应用。目的:构建聚乳酸/聚多巴胺/钽(PLA/PDA/Ta)骨组织工程支架,探究其... 详细信息

背景:聚乳酸因具有良好的生物相容性和可控的降解速率在生物医学工程中得到了广泛应用,然而存在机械强度低和生物活性不足等缺陷,限制了其在骨组织工程中的进一步应用。目的:构建聚乳酸/聚多巴胺/钽(PLA/PDA/Ta)骨组织工程支架,探究其生物安全性和体外促成骨性能。方法:利用液晶显示光固化技术制备具有多孔结构的聚乳酸(PLA)支架,将PLA支架分别浸泡在多巴胺溶液与多巴胺-纳米钽混合溶液中分别制备聚乳酸/聚多巴胺(PLA/PDA)支架、PLA/PDA/Ta支架,表征支架的微观形貌与水接触角。将MC3T3-E1细胞分别与PLA、PLA/PDA、PLA/PDA/Ta支架共培养,进行CCK-8检测与活/死细胞染色;成骨诱导分化后,进行碱性磷酸酶、茜素红染色及成骨基因检测。结果与结论:①扫描电镜下可见3种支架均具有互连的多孔三维结构,平均孔径为200μm;PLA/PDA/Ta支架的水接触角低于PLA、PLA/PDA支架(P<0.05);②CCK-8检测显示,相较于PLA、PLA/PDA支架,PLA/PDA/Ta支架可促进细胞的增殖(P<0.05);活/死细胞染色显示3组细胞增殖良好;③碱性磷酸酶与茜素红染色显示,相较于PLA、PLA/PDA支架,PLA/PDA/Ta支架可促进细胞碱性磷酸酶的表达与矿化结节形成;RT-qPCR检测显示,相较于PLA、PLA/PDA支架,PLA/PDA/Ta支架可促进细胞骨形态发生蛋白、Runx-2及Ⅰ型胶原mRNA的表达(P<0.05,P<0.01);④结果表明,PLA/PDA/Ta支架具有优异的促细胞增殖与成骨活性。

关键词：液晶显示光固化打印聚乳酸聚多巴胺纳米钽 MC3T3-E1细胞骨组织工程支架

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