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Distributed Transmit Beamforming for UAV to Base Communications

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China Communications 2019年第1期16卷 15-25页

作者： Yin Lu jun Fang Zhong Guo j.andrew Zhang jiangsu Provincial Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Wuxi Longi Intelligent Technology Co.Ltd. University of Technology Sydney

Distributed transmit beamforming(DTB) is very efficient for extending the communication distance between a swarm of UAVs and the base,particularly when considering the constraints in weight and battery life for payloads on *** this paper,we review major function modules and potential solutions in realizing DTB in UAV systems,such as timing and carrier synchronization,phase drift tracking and compensation,and beamforming vector generation and *** then focus on beamforming vector generation and updating,and introduce a concatenated training scheme,together with a recursive channel estimation and updating *** also propose three approaches for tracking the variation of channels and updating the *** effectiveness of these approaches is validated by simulation results.

关键词： unmanned aerial vehicle distributed transmit beamforming beamforming vector generation and updating channel prediction

joint resource allocation and power control for radar interference mitigation in multi-UAV networks

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Science China(Information Sciences) 2021年第8期64卷 104-116页

作者： Xinyi WANG Zesong FEI jingxuan HUANG j.andrew ZHANG jinhong YUAN School of Information and Electronics Beijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center School of Electrical and Data Engineering University of Technology Sydney School of Electrical Engineering and Telecommunications University of New South Wales

Navigation problems of unmanned air vehicles(UAVs) flying in a formation have been investigated recently, where collision avoidance is a significant issue to be addressed. In this paper, we study resource allocation and power control for radar sensing in a multi-unmanned aerial vehicle(multi-UAV)formation flight system where multiple UAVs simultaneously perform radar sensing. To cope with mutual radar interference among the UAVs, we formulate a joint channel allocation and UAV transmission power control problem to maximize the minimum signal-to-interference-plus-noise ratio(SINR) of the radar echo signals. We then propose a computationally practical method to solve this NP-hard problem by decomposing it into two sub-problems, i.e., channel allocation and transmission power control. An iterative channel allocation and power control algorithm(ICAPCA) is proposed to jointly solve these two sub-problems. We also propose a reduced-complexity greedy channel allocation algorithm(GCAA), which can also be used to provide an initial solution to ICAPCA. Simulation results show that the proposed ICAPCA and GCAA can improve the minimum SINR and radar sensing performance significantly.

关键词： multi-UAV network radar sensing channel allocation power control

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Performance Characterization and Receiver Design for Random Temporal Multiple Access in Non-Coordinated Networks

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China Communications 2019年第6期16卷 173-184页

作者： Yin Lu jun Fang Zhong Guo j.andrew Zhang jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China Wuxi Longi Intelligent Technology Co.Ltd. Wuxi 214400China University of Technology Sydney Ultimo NSW 2007Australia

Random access is a well-known multiple access method for uncoordinated communication *** work mainly focuses on optimizing iterative access protocols,assuming that packets are corrupted once they are collided,or that feedback is available and can be *** practice,a packet may still be able to be recovered successfully even when collided with other *** design and performance analysis under such a situation,particularly when the details of collision are taken into consideration,are less *** this paper,we provide a framework for analytically evaluating the actual detection performance in a random temporal multiple access system where nodes can only *** expressions are provided for collision probability and signal to interference and noise ratio(SINR)when different numbers of packets are *** then discuss and compare two receiver options for the AP,and provide detailed receiver design for the premium *** particular,we propose a synchronization scheme which can largely reduce the preamble *** also demonstrate that system performance could be a convex function of preamble length both analytically and via simulation,as well as the forward error correction(FEC)coding rate.

关键词： random temporal multiple access non-coordination networks packet collision

Inflammasome links traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease

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Neural Regeneration Research 2025年第6期20卷 1644-1664页

作者： Gabriela Seplovich Yazan Bouchi juan Pablo de Rivero Vaccari jennifer C.Munoz Pareja andrew Reisner Laura Blackwell Yehia Mechref Kevin K.Wang j.Adrian Tyndall Binu Tharakan Firas Kobeissy Department of Surgery Morehouse School of MedicineAtlantaGAUSA Department of Neurobiology Center for NeurotraumaMultiomics&Biomarkers(CNMB)Neuroscience InstituteMorehouse School of MedicineAtlantaGAUSA Department of Neurological Surgery and the Miami Project to Cure Paralysis University of Miami Miller School of MedicineMiamiFLUSA Division of Pediatric Critical Care Department of PediatricsUniversity of Miami Miller School of MedicineMiamiFLUSA Department of Pediatrics Emory UniversityAtlantaGAUSA Department of Neurosurgery Children’s Healthcare of AtlantaAtlantaGAUSA Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTXUSA Morehouse School of Medicine AtlantaGAUSA

Traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease are three distinct neurological disorders that share common pathophysiological mechanisms involving neuroinflammation. One sequela of neuroinflammation includes the pathologic hyperphosphorylation of tau protein, an endogenous microtubule-associated protein that protects the integrity of neuronal cytoskeletons. Tau hyperphosphorylation results in protein misfolding and subsequent accumulation of tau tangles forming neurotoxic aggregates. These misfolded proteins are characteristic of traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease and can lead to downstream neuroinflammatory processes, including assembly and activation of the inflammasome complex. Inflammasomes refer to a family of multimeric protein units that, upon activation, release a cascade of signaling molecules resulting in caspase-induced cell death and inflammation mediated by the release of interleukin-1β cytokine. One specific inflammasome, the NOD-like receptor protein 3, has been proposed to be a key regulator of tau phosphorylation where it has been shown that prolonged NOD-like receptor protein 3 activation acts as a causal factor in pathological tau accumulation and spreading. This review begins by describing the epidemiology and pathophysiology of traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease. Next, we highlight neuroinflammation as an overriding theme and discuss the role of the NOD-like receptor protein 3 inflammasome in the formation of tau deposits and how such tauopathic entities spread throughout the brain. We then propose a novel framework linking traumatic brain injury, chronic traumatic encephalopathy, and Alzheimer's disease as inflammasomedependent pathologies that exist along a temporal continuum. Finally, we discuss potential therapeutic targets that may intercept this pathway and ultimately minimize long-term neurological decline.

关键词： Alzheimer's disease caspase-1 chronic traumatic encephalopathy inflammasomes neurodegeneration neuroinflammation NLRP1 NLRP3 pyroptosis tauopathy traumatic brain injury

V2X-Communication Assisted Interference Minimization for Automotive Radars

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China Communications 2019年第10期16卷 100-111页

作者： jingxuan Huang Zesong Fei Tianxiong Wang Xinyi Wang Fan Liu Haijun Zhou j.andrew Zhang Guohua Wei School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunications Technology(CATT)Beijing 100083China Department of Electronic and Electrical Engineering University College LondonLondon WC1E 7JEU.K. University of Technology Sydney SydneyNSW 2007Australia

With the development of automated driving vehicles, more and more vehicles will be fitted with more than one automotive radars, and the radar mutual interference will become very significant. Vehicle to everything (V2X) communication is a potential way for coordinating automotive radars and reduce the mutual interference. In this paper, we analyze the positional relation of the two radars that interfere with each other, and evaluate the mutual interference for different types of automotive radars based on Poisson point process (PPP). We also propose a centralized framework and the corresponding algorithm, which relies on V2X communication systems to allocate the spectrum resources for automotive radars to minimize the interference. The minimum spectrum resources required for zero-interference are analyzed for different cases. Simulation results validate the analysis and show that the proposed framework can achieve near-zero-interference with the minimum spectrum resources.

关键词： automotive radars V2X communications radar interference spectrum allocation

Streamlining the preparation of “endotoxin-free” ClearColi cell extract with autoinduction media for cell-free protein synthesis of the therapeutic protein crisantaspase

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Synthetic and Systems Biotechnology 2019年第4期4卷 220-224页

作者： j.Porter Hunt Emily Long Zhao Mehran Soltani Madison Frei j.andrew D.Nelson Bradley C.Bundy Department of Chemical Engineering Brigham Young UniversityProvoUTUSA Department of Chemical Engineering Brigham Young University330N Engineering BuildingProvoUT84602USA

An“endotoxin-free”***-based cell-free protein synthesis system has been reported to produce therapeutic proteins rapidly and ***,preparation of the most complex CFPS reagent–the cell extract–remains time-consuming and labor-intensive because of the relatively slow growth kinetics of the endotoxin-free ClearColiTMBL21(DE3)*** we report a streamlined procedure for preparing *** cell extract from ClearColi™using auto-induction *** this work,the term auto-induction describes cell culture media which eliminates the need for manual induction of protein *** Clearcoli™cells in autoinduction media significantly reduces the hands-on time required during extract preparation,and the resulting“endotoxinfree”cell extract maintained the same cell-free protein synthesis capability as extract produced with traditional induction as demonstrated by the high-yield expression of crisantaspase,an FDA approved leukemia *** is anticipated that this work will lower the barrier for researchers to enter the field and use this technology as the method to produce endotoxin-free ***-based extract for CFPS.

关键词： Auto-induction Autoinduction Cell-free protein synthesis CFPS Endotoxin-free Crisantaspase Clearcoli

Visible light photocatalytic bismuth oxide coatings are effective at suppressing aquatic cyanobacteria and degrading free-floating genomic DNA

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journal of Environmental Sciences 2021年第6期33卷 128-136页

作者： james Redfern Marina Ratova andrew PDean james Pritchett Matthieu Grao joanna Verran Peter kelly Department of Natural Sciences Faculty of Science and EngineeringManchester Metropolitan UniversityChester StreetM15GDUK Surface Engineering Group Faculty of Science and EngineeringManchester Metropolitan UniversityChester StreetM15GDUK Department of Life Sciences Faculty of Science and EngineeringManchester Metropolitan UniversityChester StreetM15GDUK

Access to safe drinking water free from microbial pollution is an issue of global concern. The use of photocatalytic thin films in water treatment has focused on titanium dioxide, which requires UV-activation, proving a potential barrier to upscaling and implementation in the real world. Visible-light-activated photocatalytic thin films, such as bismuth oxide, have recently been shown to have antimicrobial properties. However, more understanding of the photocatalytic effect on the microbial population in water is required. Glass beads coated with bismuth oxide were incubated with either Microcystis aeruginosa, Anabaena sp. or free-floating genomic DNA. The presence of bismuth oxide-coated glass beads was able to rapidly stop a population of cyanobacteria from increasing. The coated beads were also able to degrade genomic DNA. Leachate from the beads showed no increase in toxicity against human liver cells. This data demonstrates the efficacy of bismuth oxide-coated glass beads for controlling potentially dangerous cyanobacterial populations, whilst potentially reducing the amount of free-floating genomic DNA(an essential issue in the face of antimicrobial resistance) – all of which should be essential considerations in emerging water treatment technologies.

关键词： Photocatalysis Bismuth oxide Cyanobacteria Water treatment Antimicrobial

Bio-Imitation of Mexican Migration Routes to the USA with Slime Mould on 3D Terrains

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journal of Bionic Engineering 2013年第2期10卷 242-250页

作者： andrew Adamatzky Genaro j Martinez Department of Computer Sciences University of the West of England Bristol BS16 1QY UK Escuela Superior de Computo Instituto Politecnico Nacional Mexico

Plasmodium ofPhysarum polycephalum （P. polycephalum） is a large single cell visible by an unaided eye. It shows sophisticated behavioural traits in foraging for nutrients and developing an optimal transport network of protoplasmic tubes spanning sources of nutrients. When placed in an environment with distributed sources of nutrients the cell computes＇ an optimal graph spanning the nutrients by growing a network of protoplasmic tubes. P. polycephalum imitates development ofman-made transport networks of a country when configuration of nutrients represents major urban areas, We employed this feature of the slime mould to imitate mexican migration to USA. The Mexican migration to USA is the World＇s larger migration system. We bio-physically imitated the migration using slime mould P. poIycephalum. In laboratory experiments with 3D Nylon terrains of USA we imitated development of migratory routes from Mexico-USA border to ten urban areas with high concentration of Mexican migrants. From results of laboratory experiments we extracted topologies of migratory routes, and highlighted a role of elevations in shaping the human movement networks.

关键词： biomimetics bio-inspired computing migration routes slime mould

The ethical cost of doing nothing

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National Science Review 2020年第7期7卷 1260-1262页

作者： andrew j.Parker University of Oxford Department of PhysiologyAnatomy and Genetics

Concern has been raised about the ethics and risks of performing genetic interventions in macaque monkeys to study models of human neuropsychiatric conditions. Here I point out that,when the outcome of some situations is truly uncertain, human decision makers tend to evaluate these situations inconsistently. The consequences of this inconsistency are sometimes profound, as they lead policy makers and reviewers to ignore or discount the ethical costs of doing nothing. I conclude that there are fundamental problems with the ‘precautionary

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