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The use of unmanned aerial vehicles (UAVs) plays an important role in supporting human activities. Man is concentrating more and more on intellectual work, and trying to automate practical activities as much as possible in order to increase their efficiency. In this regard, the use of drones is increasingly becoming a key aspect of this automation process, offering many advantages, including agility, efficiency and reduced risk, especially in dangerous missions. Hence, this Special Issue focuses on applications, platforms and services where UAVs can be used as facilitators for the task at hand, also keeping in mind that security should be addressed from its different perspectives, ranking from communications security to operational security, and furthermore considering privacy issues.

History of engineering & technology --- computer vision --- oil well working condition --- real-time detection --- sort --- unmanned aerial vehicle (UAV) --- YOLOv3 --- UAV --- autonomous landing --- vision-based --- ArduSim --- ArUco marker --- blind signature --- security --- MEC --- UAVs --- FANET --- 5G --- IoT --- Mutual authentication --- Privacy --- Traceable --- BAN logic --- coverage model --- human mobility model --- UAVs/drones positioning --- energy model --- UAS --- horizon --- undistortion --- FPGA --- sense-and-avoid --- LoRaWAN --- Unmanned Aerial Vehicles --- topology control --- virtual spring forces --- firefighting communications --- n/a

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In past decades, various sensor technologies have been used in all areas of our lives, thus improving our quality of life. In particular, imaging sensors have been widely applied in the development of various imaging approaches such as optical imaging, ultrasound imaging, X-ray imaging, and nuclear imaging, and contributed to achieve high sensitivity, miniaturization, and real-time imaging. These advanced image sensing technologies play an important role not only in the medical field but also in the industrial field. This Special Issue covers broad topics on imaging sensors and applications. The scope range of imaging sensors can be extended to novel imaging sensors and diverse imaging systems, including hardware and software advancements. Additionally, biomedical and nondestructive sensing applications are welcome.

Technology: general issues --- fluorescence LiDAR --- laser-induced fluorescence --- vegetation monitoring --- classification discrimination --- 3D measurement --- fringe projection --- 3D Fourier transform --- phase unwrapping --- phase measurement --- ultrasound --- photoacoustic imaging --- photoacoustic microscopy --- biomedical imaging --- multifocal point transducer --- wave patterns --- analytical model --- directivity pattern --- guided wave (GW) --- non-destructive testing (NDT) --- macro-fiber composite (MFC) --- transducer --- elastography --- soft tissue --- nonlinearity --- viscoelasticity --- acoustic emission --- hydrogel --- nanosilica --- transcranial --- skull bone --- aberration --- photoacoustic --- distortion --- brain imaging --- balloon catheter --- image guiding --- medical diagnostic imaging --- ultrasonic imaging --- abdominal ultrasound --- plane wave imaging --- diverging wave imaging --- synthetic focusing --- back muscle stiffness --- spine --- elasticity --- shear-wave elastography (SWE) --- tissue ultrasound palpation system (TUPS) --- reliability --- Young’s modulus --- carfilzomib --- peripheral vasculature --- quantitative analysis --- transrectal probe --- optical lens --- ultrasound imaging --- prostate cancer --- optical coherence tomography --- quad-scanner scanning strategy --- whole-directional scanning --- full-directional imaging --- IoT --- remote control --- remote operation --- remote sharing economy --- research equipment sharing --- two-photon laser scanning microscopy --- MQTT --- deep learning --- ensemble learning --- brain tumor classification --- machine learning --- transfer learning --- around view monitoring system --- automatic camera calibration --- vision-based advanced driver assistance systems --- high-frequency ultrasound --- ophthalmic imaging --- synthetic aperture --- convex array transducer --- bandwidth expander --- ultrasound transducer device --- power amplifier --- super-resolution --- clinical applications --- n/a --- Young's modulus

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This Special Issue and Book, ‘Latest Hydroforming Technology of Metallic Tubes and Sheets’, includes 16 papers, which cover the state of the art of forming technologies in the relevant topics in the field. The technologies and methodologies presented in these papers will be very helpful for scientists, engineers, and technicians in product development or forming technology innovation related to tube hydroforming processes.

Technology: general issues --- tube hydroforming --- small-diameter tube --- magnesium alloy --- warm working --- deformation characteristics --- forming defects --- forming limit --- bellows forming --- vision-based sensor --- fuzzy control --- semi-dieless forming --- local heating --- metal spinning --- tube forming --- incremental forming --- numerical control --- hydroforming --- overlapping blank --- variable-diameter part --- thickness --- ultra-thin walled tube --- tube bending --- laminated mandrel --- rotary draw bending --- Finite Element Analysis (FEA) --- deformation property --- lightweight structure --- bending --- formability --- numerical methods --- processing technology --- crash safety --- hot bending --- partial-quench --- FEM --- strip friction test --- friction coefficient --- surface roughness --- sliding speed --- contact pressure --- movable die --- loading path --- finite element simulation --- irregular bellows --- metal tube --- planetary ball dies --- diameter reduction process --- forming limits --- biaxial stretching --- forming limit measurement --- experimental design --- strain rate sensitivity --- elevated temperatures --- pneumatic forming --- drawing --- flaring --- tube expansion --- plug drawing --- thickness reduction --- hydro-flanging --- punch head shape --- finite element analysis --- alumimum alloy --- tube bulging test --- formability test --- biaxial strain --- local rubber bulging --- cutout shape --- slit length --- two-layer tube --- rigid plasticity --- arbitrary yield criterion --- arbitrary hardening law --- analytic solution --- magnesium alloy tube --- warm hydroforming --- non-uniform temperature field --- protrusion type forming --- wall thickness distribution --- coupled thermal-structural analysis --- optimization --- n/a

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In past decades, various sensor technologies have been used in all areas of our lives, thus improving our quality of life. In particular, imaging sensors have been widely applied in the development of various imaging approaches such as optical imaging, ultrasound imaging, X-ray imaging, and nuclear imaging, and contributed to achieve high sensitivity, miniaturization, and real-time imaging. These advanced image sensing technologies play an important role not only in the medical field but also in the industrial field. This Special Issue covers broad topics on imaging sensors and applications. The scope range of imaging sensors can be extended to novel imaging sensors and diverse imaging systems, including hardware and software advancements. Additionally, biomedical and nondestructive sensing applications are welcome.

Technology: general issues --- fluorescence LiDAR --- laser-induced fluorescence --- vegetation monitoring --- classification discrimination --- 3D measurement --- fringe projection --- 3D Fourier transform --- phase unwrapping --- phase measurement --- ultrasound --- photoacoustic imaging --- photoacoustic microscopy --- biomedical imaging --- multifocal point transducer --- wave patterns --- analytical model --- directivity pattern --- guided wave (GW) --- non-destructive testing (NDT) --- macro-fiber composite (MFC) --- transducer --- elastography --- soft tissue --- nonlinearity --- viscoelasticity --- acoustic emission --- hydrogel --- nanosilica --- transcranial --- skull bone --- aberration --- photoacoustic --- distortion --- brain imaging --- balloon catheter --- image guiding --- medical diagnostic imaging --- ultrasonic imaging --- abdominal ultrasound --- plane wave imaging --- diverging wave imaging --- synthetic focusing --- back muscle stiffness --- spine --- elasticity --- shear-wave elastography (SWE) --- tissue ultrasound palpation system (TUPS) --- reliability --- Young’s modulus --- carfilzomib --- peripheral vasculature --- quantitative analysis --- transrectal probe --- optical lens --- ultrasound imaging --- prostate cancer --- optical coherence tomography --- quad-scanner scanning strategy --- whole-directional scanning --- full-directional imaging --- IoT --- remote control --- remote operation --- remote sharing economy --- research equipment sharing --- two-photon laser scanning microscopy --- MQTT --- deep learning --- ensemble learning --- brain tumor classification --- machine learning --- transfer learning --- around view monitoring system --- automatic camera calibration --- vision-based advanced driver assistance systems --- high-frequency ultrasound --- ophthalmic imaging --- synthetic aperture --- convex array transducer --- bandwidth expander --- ultrasound transducer device --- power amplifier --- super-resolution --- clinical applications --- n/a --- Young's modulus

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The design of novel UAV systems and the use of UAV platforms integrated with robotic sensing and imaging techniques, as well as the development of processing workflows and the capacity of ultra-high temporal and spatial resolution data, have enabled a rapid uptake of UAVs and drones across several industries and application domains.This book provides a forum for high-quality peer-reviewed papers that broaden awareness and understanding of single- and multiple-UAV developments for remote sensing applications, and associated developments in sensor technology, data processing and communications, and UAV system design and sensing capabilities in GPS-enabled and, more broadly, Global Navigation Satellite System (GNSS)-enabled and GPS/GNSS-denied environments.Contributions include:UAV-based photogrammetry, laser scanning, multispectral imaging, hyperspectral imaging, and thermal imaging;UAV sensor applications; spatial ecology; pest detection; reef; forestry; volcanology; precision agriculture wildlife species tracking; search and rescue; target tracking; atmosphere monitoring; chemical, biological, and natural disaster phenomena; fire prevention, flood prevention; volcanic monitoring; pollution monitoring; microclimates; and land use;Wildlife and target detection and recognition from UAV imagery using deep learning and machine learning techniques;UAV-based change detection.

Technology: general issues --- UAV --- landing --- optical flow --- video navigation --- Kalman filter --- coastal mapping --- coastal monitoring --- Digital Elevation Models (DEMs) --- geomorphological evolution --- photogrammetry --- Structure-from-Motion (SfM) --- Unmanned Aerial Vehicles (UAVs) --- snow mapping --- UAS --- remote sensing --- direct georeferencing --- snow field --- snow-covered area --- snow depth --- water level changes --- UAV photogrammetry --- tidal phase --- GNSS --- Kilim River --- unmanned aerial vehicles --- UAV swarms --- visual detection --- visual tracking --- machine vision --- deep learning --- YOLO --- laser guidance --- emergency landing --- particle filter --- change detection --- convolutional neural networks --- moving camera --- image alignment --- multirotor --- ground effect --- sensor faults --- UAV imagery --- bundle block adjustment --- digital surface model --- orthomosaic --- data collection --- accuracy --- technical guidelines --- DSM assessment --- backpack mobile mapping --- underground cellars --- unmanned aerial vehicle --- unmanned aerial system --- vision-based navigation --- search and rescue --- vision and action --- OODA --- inspection --- target detection --- autonomous localization --- 3D registration --- GPS-denied environment --- real-time --- multi-robot --- bioinspired map --- topologic mapping --- map exploration --- onboard GNSS RTK --- UAS traffic management --- multiple UAV navigation --- navigation in GPS/GNSS-denied environments --- distributed state estimation --- consensus theory --- computer architecture --- decision making --- navigation --- semantics --- aerial systems --- applications, inspection robotics, bridge inspection with UAS --- POMDP --- Deep Reinforcement-Learning --- multi-agent --- search