Search results for "uav"

showing 10 items of 113 documents

Multiple UAV cooperative path planning via neuro-dynamic programming

2004

In this paper, a team of n unmanned air-vehicles (UAVs) in cooperative path planning is given the task of reaching the assigned target while i) avoiding threat zones ii) synchronizing minimum time arrivals on the target, and iii) ensuring arrivals coming from different directions. We highlight three main contributions. First we develop a novel hybrid model and suit it to the problem at hand. Second, we design consensus protocols for the management of information. Third, we synthesize local predictive controllers through a distributed, scalable and suboptimal neuro-dynamic programming (NDP) algorithm.

Information managementEngineeringbusiness.industryDistributed computingSynchronizingControl engineeringUnmanned air-vehicles (UAV)Task (project management)Dynamic programmingModel predictive controlDistributed algorithmScalabilityNeuro-dynamic programmingMotion planningbusinessNeuro-dynamic programming; Unmanned air-vehicles (UAV)
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AI for Resource Allocation and Resource Allocation for AI: a two-fold paradigm at the network edge

2022

5G-and-beyond and Internet of Things (IoT) technologies are pushing a shift from the classic cloud-centric view of the network to a new edge-centric vision. In such a perspective, the computation, communication and storage resources are moved closer to the user, to the benefit of network responsiveness/latency, and of an improved context-awareness, that is, the ability to tailor the network services to the live user's experience. However, these improvements do not come for free: edge networks are highly constrained, and do not match the resource abundance of their cloud counterparts. In such a perspective, the proper management of the few available resources is of crucial importance to impr…

Internet Of ThingMINLPIoTEdge NetworkPerformance EvaluationLow Power Wide Area NetworkSystem ModelingSettore ING-INF/03 - TelecomunicazioniUAVSoftware Defined RadioReal TestbedVehicular NetworkMLLoRaReinforcement LearningResource AllocationMachine LearningGame TheoryArtificial IntelligenceAILPWANColosseum Channel EmulatorChannel EmulationEmulationSDR
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Trajectory Decentralized Fuzzy Control of Multiple UAVs.

2008

This paper considers a complete position and heading rate control system for multiple unmanned aerial vehicles (UAVs) with constant altitude. A decentralized trajectory planning algorithm is proposed, where the UAVs will avoid collisions while moving. In order to stabilize the UAVs in the reference planned trajectories and ensure the boundedness of the control velocities, a fuzzy control law is proposed with Lyapunov's stability proof. Simulation experiments developed in Matlab environment confirm the effectiveness and the robustness of the proposed control algorithm with respect to possible turbulence disturbances perturbing the nominal motion of the UAVs.

Lyapunov stabilityLyapunov functionAutomatic controlComputer scienceTrajectory Decentralized Fuzzy Control Multiple UAVFuzzy control systemMotion controlComputer Science::Multiagent SystemsComputer Science::Roboticssymbols.namesakeSettore ING-INF/04 - AutomaticaComputer Science::Systems and ControlControl theoryControl systemTrajectorysymbolsMotion planning
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A Social Spider Optimisation Algorithm for 3D Unmanned Aerial Base Stations Placement

2020

International audience; In recent years, the use of drones as aerial base stations (ABS) has attracted the attention of both scientific and industrial communities as a promising solution to enhance the network coverage. However, their deployment brings out many challenges and restrictions. In this work, we model a realistic, constrained scenario where unmanned aerial vehicles (UAVs) are used as ABSs along with traditional ground base stations (GBSs) to extend their coverage. We propose a scalable and efficient social spider optimization (SSO) algorithm that determines the placement of UAVs and their association with both user equipments (UEs) and GBSs. Extensive computational experiments we…

MINLPOptimizationSignal to noise ratio[SPI] Engineering Sciences [physics]UAVStatisticsBase stationssocial spider optimisation[SPI]Engineering Sciences [physics]dronesSociologyaerial base stationsThree-dimensional displaysInterference
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New ultraportable data logger to perform magnetic surveys

2019

This article presents the realization of a device for magnetic surveys It is a flexible, user-reprogramable, lightweight, and compact tool that can be easily integrated with aerial and marine drones. The device can accurately measure the local magnetic anomalies. It is based on the Atmega 2560 microcontroller and a digital 3-axis fluxgate magnetometer.

Magnetic domaingeophysicMagnetometerbusiness.industryComputer scienceUAV010401 analytical chemistryElectrical engineeringMeasure (physics)Magnetic separationmagnetic surveyComputerApplications_COMPUTERSINOTHERSYSTEMS010502 geochemistry & geophysics01 natural sciences0104 chemical scienceslaw.inventionMicrocontrollerlawROVData loggerMagnetic anomalybusinessRealization (systems)0105 earth and related environmental sciences
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SARS CoV2 infection _The longevity study perspectives

2021

Graphical abstract

MaleAgingssRNA single-stranded RNARFLP restriction fragment length polymorphismHSPs heat shock proteinsReviewPTMs post-translational modificationsSevere Acute Respiratory SyndromeBiochemistryHIV-1 human immunodeficiency virus-1TNF-α tumor necrosis factor-αEC endothelial cells0302 clinical medicineFluAV influenza A virusI insertionMedicineIFN-γ interferon-γDIC disseminated intravascular coagulationPCR Polymerase Chain Reactionmedia_commonAged 80 and overLongevityRBD receptor-binding domainNeurologyLongevity modelMI myocardial infarctionNK natural killerhPIV2 human parainfluenza virus type 2media_common.quotation_subjectResearching genetic basis of resistance and potential pharmacological targetsLongevityDBP diastolic blood pressureNF-Kb nuclear transcription factor kBRANTES regulated upon activation normal T cell expressed and secretedMphi human macrophages03 medical and health sciencesCox 2 cyclooxygenase 2ORF open reading framePT prothrombin timeSettore MED/05 - Patologia ClinicaHumansMolecular BiologyInflammatory genesARDS acute respiratory distress syndromeNO nitric oxideD deletionCpGIs CpG islandsT2DM type 2 diabetes mellitusmedicine.diseaseFDP fibrin degradation products030104 developmental biologySARS CoV2 severe acute respiratory syndrome Coronavirus 2 virusImmunologyBMI body max indexItalian nonagenarians/centenariansRSV respiratory syncytial virusComplication030217 neurology & neurosurgeryMAPK mitogen-activated protein kinaseIP-10 IFN-γ -Inducible Protein 1040301 basic medicineAT1R activity of angiotensin 1 receptorsDCs dentritic cellsSSCP single strand conformation polymorphismACE/DD polymorphism of the angiotensin converting enzymeFGF21 fibroblast growth factor 21TLR4 toll-like receptor 4NAD nicotinamide adenine dinucleotideACE angiotensin-I converting enzymeAT2R activity of angiotensin 2 receptorsCOVID-19 Coronavirus disease 2019Respiratory distressACE2 angiotensin converting enzyme 2MKP-1 mitogen-activated protein kinase phosphatase-1 ()PD protease domainSNP single nucleotide polymorphismEH essential hypertensionTNFR tumor necrosis factor receptorINR international normalized ratio of the prothrombin timePAI-1 plasminogen activator inhibitor-1Ang angiotensinLPS lipopolysaccharideMCP1 monocyte chemoattractant protein-1medicine.symptomaPTT partial thromboplastin timeBiotechnologyDUSP1 dual specificity phosphatase 1Coronavirus disease 2019 (COVID-19)PC prostate cancerRAS renin-angiotensin aldosterone systemCCR5Δ32 genetic variant of chemokine receptorCOVID-19 Researching genetic basis of resistance and potential pharmacological targets Italian nonagenarians/centenarians Longevity modelAsymptomaticSARS-1 severe acute respiratory syndrome virus 1SIRT-1 Sirtuin 1Th1 t-helper lymphocyte type 1Immune systemROS reactive oxygen speciesTGF-β transforming growth factor betaET-1 endothelin-1ComputingMethodologies_COMPUTERGRAPHICSADAM-17 metallopeptidase domain 17business.industrySARS-CoV-2SBP systolic blood pressureCOVID-19HDACs histone deacetylasesComorbidityImmune Systembusiness5-LO lipoxygenase 5Ageing Research Reviews
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Predicting sediment deposition rate in check-dams using machine learning techniques and high-resolution DEMs

2021

Sediments accumulated in check dams are a valuable measure to estimate soil erosion rates. Here, geographic information systems (GIS) and three machine learning techniques (MARS-multivariate adaptive regression splines, RF-random forest and SVM-support vector machine) were used, for the first time, to predict sediment deposition rate (SR) in check-dams located in six watersheds in SW Spain. There, 160 dry-stone check dams (~ 77.8 check-dams km−2), accumulated sediments during a period that varied from 11 to 23 years. The SR was estimated in former research using a topographical method and a high-resolution Digital Elevation Model (DEM) (average of 0.14 m3 ha−1 year−1). Nine environmental-to…

Mean squared error0208 environmental biotechnologyMean absolute errorSoil ScienceHigh resolution02 engineering and technology010501 environmental sciencesMachine learningcomputer.software_genre01 natural sciencesEnvironmental ChemistryDigital elevation model0105 earth and related environmental sciencesEarth-Surface ProcessesWater Science and TechnologyGlobal and Planetary ChangeMultivariate adaptive regression splinesbusiness.industryGeologyMars Exploration ProgramPollution020801 environmental engineeringCheck dam Machine learning techniques Sediment deposition rate (SR) Structure-from-motion (SfM) Unmanned aerial vehicle (UAV)Support vector machineArtificial intelligencebusinesscomputerCheck dam
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Exploring the use of Unmanned Aerial Vehicles (UAVs) with the simplified ‘triangle’ technique for soil water content and evaporative fraction retriev…

2020

Participation of Dr. Petropoulos has been funded by the ENViSIoN-EO Marie Skłodowska-Curie grant (grant No 752094), part of the European Union’s Horizon 2020 research and innovation programme. Part of the present collaborative work was also materialised in the framework of a short Term Scientific Mission (STSM) of the HARMONIOUS Cost Action which financially supported Dr Petropoulos’ visit between 4 to 15 February 2020 to the Department of Engineering of the University of Palermo, Italy. Η συμμετοχή του Δρ. Πετρόπουλου χρηματοδοτήθηκε από το πρόγραμμα της Ευρωπαϊκής Ένωσης για Έρευνα και Καινοτομία «Oρίζοντας 2020», δράση Marie Sklodowska - Curie , έργο ENViSIoN-EO (αριθ. 752094). Επίσης μέ…

Mediterranean climateFLUXES010504 meteorology & atmospheric sciencesNDVICombined use0211 other engineering and technologiesLINEFraction (chemistry)02 engineering and technology01 natural sciencesUnmanned Aerial Vehicles Simplified triangle method NDVI CItrus orchardSPACE021101 geological & geomatics engineering0105 earth and related environmental sciencesRemote sensingEarth observationEVAPOTRANSPIRATIONMOISTURE RETRIEVALSGlobal Navigation Satellite System (GNSS) SurveySettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaUnmanned Aerial VehiclesUAVsMODELMODISSoil waterGeneral Earth and Planetary SciencesEnvironmental scienceSimplified triangle methodUnmanned Aerial Vehicles (UAVs)HIGH-RESOLUTIONSettore ICAR/06 - Topografia E CartografiaInternational Journal of Remote Sensing
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Network Connectivity and Area Coverage for UAV Fleet Mobility Model with Energy Constraint

2016

International audience; Our main focus through the present paper is on developing an original distributed mobility model for autonomous fleet of interconnected UAVs (Unmanned Aerial Vehicles) performing an area exploration mission. The UAVs, equipped with wireless ad-hoc capabilities, are required to optimally explore an area while maintaining connectivity with their neighboring UAVs and the base station. Because energy is a scarce resource, especially for UAVs, its wise management is quite beneficial for the network lifetime and mission success. Hence, the proposed mobility model, compared to other models in the literature, is the first to ever include the remaining energy level as decisio…

Mobility modelWireless ad hoc networkComputer scienceDistributed computing[ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI]050801 communication & media studiesComputerApplications_COMPUTERSINOTHERSYSTEMS02 engineering and technologyBase station0508 media and communicationsResource (project management)DTN (Delay Tolerant Networks)0202 electrical engineering electronic engineering information engineeringWireless[INFO.INFO-NI] Computer Science [cs]/Networking and Internet Architecture [cs.NI]business.industryMobility Model05 social sciences020206 networking & telecommunicationsAdhoc NetworksAlgorithm designbusinessFocus (optics)UAVs (Unmanned Aerial Vehicles)Energy (signal processing)Computer network
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Efficient Steering Mechanism for Mobile Network-Enabled UAVs

2022

HTTP Adaptive Streaming (HAS) is becoming the de-facto video delivery technology over best-effort networks nowadays, thanks to the myriad advantages it brings. However, many studies have shown that HAS suffers from many Quality of Experience (QoE)-related issues in the presence of competing players. This is mainly caused by the selfishness of the players resulting from the decentralized intelligence given to the player. Another limitation is the bottleneck link that could happen at any time during the streaming session and anywhere in the network. These issues may result in wobbling bandwidth perception by the players and could lead to missing the deadline for chunk downloads, which result …

Networking and Internet Architecture (cs.NI)FOS: Computer and information sciencesOptimization problembusiness.industryComputer scienceDistributed computingComputerApplications_COMPUTERSINOTHERSYSTEMS020302 automobile design & engineering020206 networking & telecommunications02 engineering and technologyComputer Science - Networking and Internet ArchitectureMechanism (engineering)0203 mechanical engineeringModels of communication0202 electrical engineering electronic engineering information engineeringCellular networkWirelessConnection steeringQuality of experienceUnmanned Aerial Vehicles (UAVs)Mobile NetworksbusinessGame theory2019 IEEE Global Communications Conference (GLOBECOM)
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