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An overview on integrated localization and communication towards 6G

Science China(Information Sciences) 2022年第3期65卷 5-50页

作者： Zhiqiang XIAO yong zeng National Mobile Communications Research Laboratory Southeast University Purple Mountain Laboratories

While the fifth generation(5 G) cellular system is being deployed worldwide, researchers have started the investigation of the sixth generation(6 G) mobile communication networks. Although the essential requirements and key usage scenarios of 6 G are yet to be defined, it is believed that 6 G should be able to provide intelligent and ubiquitous wireless connectivity with Terabits per second(Tbps) data rate and submillisecond(sub-ms) latency over three-dimensional(3 D) network coverage. To achieve such goals, acquiring accurate location information of the mobile terminals is becoming extremely useful, not only for locationbased services but also for improving wireless communication performance in various ways such as channel estimation, beam alignment, medium access control, routing, and network optimization. On the other hand, the advancement of communication technologies also brings new opportunities to greatly improve the localization performance, as exemplified by the anticipated centimeter-level localization accuracy in 6 G by extremely large-scale multiple-input multiple-output(MIMO) and millimeter wave(mm Wave) *** this regard, a unified study on integrated localization and communication(ILAC) is necessary to unlock the full potential of wireless networks for dual purposes. While there are extensive studies on wireless localization or communications separately, the research on ILAC is still in its infancy. Therefore, this article aims to give a tutorial overview on ILAC towards 6 G wireless networks. After a holistic survey on wireless localization basics, we present the state-of-the-art results on how wireless localization and communication inter-play with each other in various network layers, together with the main architectures and techniques for localization and communication co-design in current two-dimensional(2 D) and future 3 D networks with aerial-ground integration. Finally, we outline some promising future research directions for ILAC.

关键词： wireless localization integrated localization and communication cellular networks B5G 6G

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Indium tin oxide nanosized composite powder prepared using waste ITO target

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Rare Metals 2005年第3期24卷 277-282页

作者： LIU Jiaxiang GAN yong zeng Shengnan The Key Laboratory for Science and Technology of Controllable Chemical Reactions Ministry of Education College of Materials Science andEngineering Beijing University of Chemical Technology Beijing 100029 China

Indium tin oxide （ITO） nano-particles were prepared directly using waste ITO target, which had been coated by magnetron controlled sputtering. The waste ITO target was cleaned with de-ionized water, and then dissolved in acid, filtrated, neutralized, manipulated through azeotropic distillation and finally dried, and in this way the precursor of indium tin hydroxide was obtained. The nanosized rio composite powder was prepared after the precursor heat-treated at 500℃ for 2 h. TEM images show a narrow distribution of particle size is 5-20 nm and the particle size can be controlled. Its granule has a spherical shape and the dispersion of the particle is well. X-ray diffraction （XRD） patterns indicate the only cubic In2O3 phase in the ITO powder hot-treated at 500℃. The purity of ITO composite powder is 99.9907%. The content of radium within filtrate was detected by using the EDTA titration of determination of indium in the ITO powder and ITO target. Appropriate amount of SnCl4.5H2O was dissolved in the filtrate, and then ITO powder containing 10 wt.% SnO2 was successfully prepared by heat-treating.

关键词： waste ITO target nanosized ITO composite powder chemical technique microstructure

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The ground deformation field induced by a listric thrust fault with an overburden soil layer

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Frontiers of Earth Science 2013年第4期7卷 501-507页

作者： Shaogang zeng yong'en CAI Department of Geophysics Peking University Beijing 100871 China

The surface deformation field induced by a listric thrust fault with a thick, overburden soil layer is studied in this paper by the finite element method （FEM）. The results show：（a） The maximum slip induced by the buried fault is not located at upper tip of the fault, but below it. （b） The vertical displacement changes remarkably near the fault, forming a fault scarp. With the increase of the soil layer thickness, the height of the scarp is decreased for the same earthquake magnitude. （c） The strong strain zone on the surface is localized near the projection of the fault tip on the ground surface. The horizontal strains in the zone are in tension above the hanging wall and in compression above the foot wall, and the vertical strains in the zone are vice versa, which is favorable for tensile- shear, compression-shear fissures above hanging wall and foot wall, respectively.

关键词： listric thrust fault earthquake fault scarps,ground fissures finite element method (FEM)

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Multi-Antenna UAV Data Harvesting:Joint Trajectory and Communication Optimization

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Journal of Communications and Information Networks 2020年第1期5卷 86-99页

作者： Jingwei Zhang yong zeng Rui Zhang Department of Electrical and Computer Engineering National University of SingaporeSingapore National Mobile Communications Research Laboratory Southeast UniversityNanjingChina.Purple Mountain LaboratoriesNanjingChina

Unmanned aerial vehicle(UAV)-enabled communication is a promising technology to extend coverage and enhance throughput for traditional terres-trial wireless communication *** this paper,we consider a UAV-enabled wireless sensor network,where a multi-antenna UAV is dispatched to collect data from a group of sensor nodes(SNs).The objective is to maximize the minimum data collection rate from all SNs via jointly optimizing their transmission scheduling and power allocations as well as the trajectory of the UAV,subject to the practical constraints on the maximum transmit power of the SNs and the maximum speed of the *** formulated optimization problem is challenging to solve as it involves non-convex constraints and discrete-value *** draw useful insight,we first consider the special case of the formulated problem by ignoring the UAV speed constraint and optimally solve it based on the Lagrange duality *** is shown that for this relaxed problem,the UAV should hover above a finite number of optimal locations with different durations in ***,we address the general case of the formulated problem where the UAV speed constraint is considered and propose a traveling salesman problem-based trajec-tory initialization,where the UAV sequentially visits the locations obtained in the relaxed problem with minimumflying *** this initial trajectory,we thenfind the corresponding transmission scheduling and power alloca-tions of the SNs and further optimize the UAV trajectory by applying the block coordinate descent and successive convex approximation ***,numerical results are provided to illustrate the spectrum and energy efficiency gains of the proposed scheme for multi-antenna UAV data harvesting,as compared to benchmark schemes.

关键词： wireless sensor network multi-antenna unmannedaerialvehicle(UAV) ratemaximization trajectoryoptimization

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A survey of prototype and experiment for UAV communications

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Science China(Information Sciences) 2021年第4期64卷 5-25页

作者： Qingheng SONG yong zeng Jie XU Shi JIN College of Electrical and Information Engineeing Huaihua University Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province National Mobile Communications Research Laboratory Southeast University Future Network of Intelligence Institute (FNii) and School of Science and Engineering The Chinese University of Hong Kong (Shenzhen)

Unmanned aerial vehicle(UAV) communications have attracted significant attention from both academia and industry. To facilitate the large-scale usage of UAVs for various applications in practice,we provide a comprehensive survey on the prototype and experiment for UAV communications. To this end, we first provide an overview on the general architecture of the prototype and experiment for UAV communications, and then present experimental verification for air-to-ground channel models and UAV energy consumption models. Next, we discuss measurement experiments on two promising paradigms of UAV communications, namely cellular-connected UAVs and UAV-enabled aerial communication platforms. For the former, we focus on the feasibility study and address the interference mitigation issue. For UAV-enabled aerial communication platforms, we present three scenarios, namely UAV-enabled aerial base stations, UAVenabled aerial relays and UAV-enabled aerial data collection/dissemination. Finally, we point out some promising future directions for prototype and experimental measurements of UAV communications.

关键词： UAV communications prototype development channel model energy efficiency UAV-enabled communications platforms cellular-connected UAVs

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EXISTENCE RESULTS FOR THE KIRCHHOFF TYPE EQUATION WITH A GENERAL NONLINEAR TERM

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Acta Mathematica Scientia 2022年第5期42卷 2063-2077页

作者： Huirong PI yong zeng School of Mathematics and Information Guangci UniversityNanning 530004China

This paper is mainly concerned with existence and nonexistence results for solutions to the Kirchhoff type equation−(a+b∫_(R^(3))|∇u|^(2))Δu+V(x)u=f(u)in R^(3),with the general hypotheses on the nonlinearity f being as introduced by Berestycki and *** analysis introduces variational techniques to the analysis of the effect of the nonlinearity,especially for those cases when the concentration-compactness principle cannot be applied in terms of obtaining the compactness of the bounded Palais-Smale sequences and a minimizing problem related to the existence of a ground state on the Pohozaev manifold rather than the Nehari manifold associated with the equation.

关键词： Kirchhoff type equation general nonlinearity variational methods Pohozaev identity

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On computer virus spreading using node-based model with time-delayed intervention strategies

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Science China(Information Sciences) 2019年第5期62卷 240-242+244-249页

作者： Yi YU Jiangping HU yong zeng School of Automation Engineering University of Electronic Science and Technology of China Department of Automation Wuhan University

Dear editor,Computer virus has become a major factor that poses a severe threat to contemporary information systems [1]. Some common models, e.g., threshold models, compartment-based models, and nodebased models have ... 详细信息

关键词： Figure On computer virus spreading using node-based model with time-delayed intervention strategies

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Single-cell RNA Sequencing Deciphers Immune Landscape of Human Recurrent Miscarriage

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Genomics, Proteomics & Bioinformatics 2021年第2期19卷 169-171页

作者： Chunyu Huang yong zeng Wenwei Tu Department of Paediatric and Adolescent Medicine Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Shenzhen Key Laboratory of Reproductive Immunology for Peri-implantation Fertility CenterShenzhen Zhongshan Urology HospitalShenzhen 518045China

Introduction Pregnancy is a mysterious biological process that presents great challenges to the maternal immune *** the early 1950s,the‘‘fetal allograft”concept was described for the first time by Peter Medawar,and the unique immunology of the maternal-fetal interface was recognized[1].Correct and precise interaction between mother and fetus plays an important role during pregnancy process,such as the apposition,adhesion,implantation,and growth of embryo in uterus[2].In 1991,Colbern and Main proposed that the maternal immune cells directly interact with placenta but not the fetus[3].Therefore,information concerning the cross-talk between maternal immune cells and placenta during normal pregnancy will provide clues to explore the underlying mechanism of pathological *** cells,such as natural killer(NK),macrophage,T,and dendritic cells,have been demonstrated to play important roles during normal pregnancy[4].With the development of single-cell RNA sequencing(scRNA-seq)technologies,researchers are devoted to providing a whole picture about the immune cellular composition and inter-cellular communication events during normal pregnancy[5,6].These foundational studies reveal that immune cell subsets,which are classified based on different markers at high resolution,exert specific function during pregnancy ***,the panoramic analysis of immune subsets at high resolution in pathological pregnancy remains lacking.

关键词： fetus Immune mother

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Control of electromechanical performance in 3D printing latticestructured BaTiO_(3) piezoelectric ceramics

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Journal of Advanced Ceramics 2024年第7期13卷 987-1001页

作者： Zhujun Jiang Yinghong Sun Jimin Chen yong zeng Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Engineering Research Center of 3D Printing for Digital Medical Health Beijing University of TechnologyBeijing 100124China

Barium titanate(BaTiO_(3))piezoelectric ceramics with triply periodic minimal surface(TPMS)structures have been frequently used in filters,engines,artificial bones,and other fields due to their high specific surface area,high thermal stability,and good heat ***,only a limited number of studies have analyzed the effect of various parameters,such as different wall thicknesses and porosities of TPMS structures,on ceramic electromechanical *** this study,we first employed vat photopolymerization(VPP)three-dimensional(3D)printing technology to fabricate high-performance BaTiO_(3) *** investigated the slurry composition design and forming process and designed a stepwise sintering postprocessing technique to achieve a density of 96.3%and a compressive strength of 250±25 MPa,with the piezoelectric coefficient(d_(33))reaching 263 pC/***,we explored the influence of three TPMS structures,namely,diamond,gyroid,and Schwarz P,on the piezoelectric and mechanical properties of BaTiO_(3) ceramics,with the gyroid structure identified as exhibiting optimal ***,we examined the piezoelectric and mechanical properties of BaTiO_(3) ceramics with the gyroid structure of varying wall thicknesses and porosities,thus enabling the modulation of ceramic electromechanical performance.

关键词： three-dimensional(3D)printing piezoelectric ceramics porous structure mechanical properties electrical properties

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Association between Serum Alkaline Phosphatase and Carotid Atherosclerosis in a Chinese Population: A Community-based Cross-sectional Study

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Biomedical and Environmental Sciences 2019年第6期32卷 446-453页

作者： YE Yi Cong LIU Hua Min ZHOU yong zeng yong Beijing Institute of Heart Lung and Blood Vessel Diseases Beijing Anzhen Hospital Capital Medical University Beijing 100029 China School of public health Taishan Medical University Tai'an 271016 Shandong China Sanbo Brain Institute Sanbo Brain Hospital Capital Medical University Beijing 100029 China

Objective This study aimed to investigate the relationship between alkaline phosphatase(ALP) and common carotid intima media thickness(IMT), carotid plaque, and extracranial carotid artery stenosis(ECAS). Methods A total of 3,237 participants aged ≥ 40 years were recruited from Jidong community in 2013-2014. Participants were divided into five quintile groups based on their serum ALP levels. Carotid atherosclerosis was assessed using ultrasound. Abnormal IMT, carotid plaque, and ECAS were defined as IMT > 0.9 mm, IMT > 1.5 mm, and ≥ 50% stenosis in at least one extracranial carotid artery, respectively. Results Common carotid IMT values and the prevalence of carotid plaque increased across serum ALP quintiles. Higher ALP quintiles were correlated with an increased risk of abnormal IMT [fourth quintile: odds ratio(OR) 1.78, 95% confidence interval(CI) 1.13-2.82, P = 0.0135;fifth quintile: OR = 1.82, 95% CI: 1.15-2.87, P = 0.0110] and ECAS compared to the lowest quintile(fifth quintile: OR = 1.47, 95% CI: 1.09-1.97, P = 0.0106). The association between ALP and prevalence of carotid plaque became insignificant after adjustment for confounders. Conclusion Serum ALP levels were independently associated with abnormal common carotid IMT and ECAS. These conclusions need to be further corroborated in future prospective cohort studies.

关键词： Alkaline phosphatase Atherosclerosis Intima media thickness Carotid plaque Extracranial carotid artery stenosis

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