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https://www.readbyqxmd.com/read/29346529/echocardiographic-criteria-to-detect-unicuspid-aortic-valve-morphology
#1
Sebastian Ewen, Irem Karliova, Petra Weber, Stephan H Schirmer, Hashim Abdul-Khaliq, Jakob Schöpe, Felix Mahfoud, Hans-Joachim Schäfers
Aims: Unicuspid aortic valve (UAV) is a rare congenital malformation associated with severe aortic stenosis or regurgitation. This study aimed to systematically determine echocardiographic criteria to identify UAV. Methods and results: All patients underwent a preoperative baseline examination, including echocardiography. A total of 69 patients with intraoperatively confirmed UAV underwent an aortic valve repair procedure between August 2001 and May 2011. To compare the findings of UAV cases with those of other valve morphologies, we examined 99 consecutive patients with a bicuspid aortic valve (BAV) and 103 consecutive patients with a tricuspid aortic valve (TAV) undergoing isolated aortic valve surgery before May 2016...
January 15, 2018: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29342908/rapid-3d-reconstruction-for-image-sequence-acquired-from-uav-camera
#2
Yufu Qu, Jianyu Huang, Xuan Zhang
In order to reconstruct three-dimensional (3D) structures from an image sequence captured by unmanned aerial vehicles' camera (UAVs) and improve the processing speed, we propose a rapid 3D reconstruction method that is based on an image queue, considering the continuity and relevance of UAV camera images. The proposed approach first compresses the feature points of each image into three principal component points by using the principal component analysis method. In order to select the key images suitable for 3D reconstruction, the principal component points are used to estimate the interrelationships between images...
January 14, 2018: Sensors
https://www.readbyqxmd.com/read/29342856/calculation-and-identification-of-the-aerodynamic-parameters-for-small-scaled-fixed-wing-uavs
#3
Jieliang Shen, Yan Su, Qing Liang, Xinhua Zhu
The establishment of the Aircraft Dynamic Model(ADM) constitutes the prerequisite for the design of the navigation and control system, but the aerodynamic parameters in the model could not be readily obtained especially for small-scaled fixed-wing UAVs. In this paper, the procedure of computing the aerodynamic parameters is developed. All the longitudinal and lateral aerodynamic derivatives are firstly calculated through semi-empirical method based on the aerodynamics, rather than the wind tunnel tests or fluid dynamics software analysis...
January 13, 2018: Sensors
https://www.readbyqxmd.com/read/29342101/a-novel-methodology-for-improving-plant-pest-surveillance-in-vineyards-and-crops-using-uav-based-hyperspectral-and-spatial-data
#4
Fernando Vanegas, Dmitry Bratanov, Kevin Powell, John Weiss, Felipe Gonzalez
Recent advances in remote sensed imagery and geospatial image processing using unmanned aerial vehicles (UAVs) have enabled the rapid and ongoing development of monitoring tools for crop management and the detection/surveillance of insect pests. This paper describes a (UAV) remote sensing-based methodology to increase the efficiency of existing surveillance practices (human inspectors and insect traps) for detecting pest infestations (e.g., grape phylloxera in vineyards). The methodology uses a UAV integrated with advanced digital hyperspectral, multispectral, and RGB sensors...
January 17, 2018: Sensors
https://www.readbyqxmd.com/read/29316734/superpixel-based-feature-for-aerial-image-scene-recognition
#5
Hongguang Li, Yang Shi, Baochang Zhang, Yufeng Wang
Image scene recognition is a core technology for many aerial remote sensing applications. Different landforms are inputted as different scenes in aerial imaging, and all landform information is regarded as valuable for aerial image scene recognition. However, the conventional features of the Bag-of-Words model are designed using local points or other related information and thus are unable to fully describe landform areas. This limitation cannot be ignored when the aim is to ensure accurate aerial scene recognition...
January 8, 2018: Sensors
https://www.readbyqxmd.com/read/29315256/a-novel-attitude-determination-system-aided-by-polarization-sensor
#6
Wei Zhi, Jinkui Chu, Jinshan Li, Yinlong Wang
This paper aims to develop a novel attitude determination system aided by polarization sensor. An improved heading angle function is derived using the perpendicular relationship between directions of E-vector of linearly polarized light and solar vector in the atmospheric polarization distribution model. The Extended Kalman filter (EKF) with quaternion differential equation as a dynamic model is applied to fuse the data from sensors. The covariance functions of filter process and measurement noises are deduced in detail...
January 9, 2018: Sensors
https://www.readbyqxmd.com/read/29315219/proposal-of-a-method-to-determine-the-correlation-between-total-suspended-solids-and-dissolved-organic-matter-in-water-bodies-from-spectral-imaging-and-artificial-neural-networks
#7
Maurício R Veronez, Lucas S Kupssinskü, Tainá T Guimarães, Emilie C Koste, Juarez M da Silva, Laís V de Souza, William F M Oliverio, Rogélio S Jardim, Ismael É Koch, Jonas G de Souza, Luiz Gonzaga, Frederico F Mauad, Leonardo C Inocencio, Fabiane Bordin
Water quality monitoring through remote sensing with UAVs is best conducted using multispectral sensors; however, these sensors are expensive. We aimed to predict multispectral bands from a low-cost sensor (R, G, B bands) using artificial neural networks (ANN). We studied a lake located on the campus of Unisinos University, Brazil, using a low-cost sensor mounted on a UAV. Simultaneously, we collected water samples during the UAV flight to determine total suspended solids (TSS) and dissolved organic matter (DOM)...
January 9, 2018: Sensors
https://www.readbyqxmd.com/read/29301211/3d-indoor-positioning-of-uavs-with-spread-spectrum-ultrasound-and-time-of-flight-cameras
#8
José A Paredes, Fernando J Álvarez, Teodoro Aguilera, José M Villadangos
This work proposes the use of a hybrid acoustic and optical indoor positioning system for the accurate 3D positioning of Unmanned Aerial Vehicles (UAVs). The acoustic module of this system is based on a Time-Code Division Multiple Access (T-CDMA) scheme, where the sequential emission of five spread spectrum ultrasonic codes is performed to compute the horizontal vehicle position following a 2D multilateration procedure. The optical module is based on a Time-Of-Flight (TOF) camera that provides an initial estimation for the vehicle height...
December 30, 2017: Sensors
https://www.readbyqxmd.com/read/29300173/a-tale-of-two-tails-developing-an-avian-inspired-morphing-actuator-for-yaw-control-and-stability
#9
Lawren L Gamble, Daniel J Inman
Motivated by the lack of research in tailless morphing aircraft in addition to the current inability to measure the resultant aerodynamic forces and moments of bird control maneuvers, this work aims to develop and test a multi-functional morphing control surface based on the horizontal tail of birds for a low-radar-signature UAV. Customized Macro Fiber Composite (MFC) actuators were designed to achieve yaw control across a range of sideslip angles by inducing three dimensional curvature as a result of bending-twisting coupling, a well-known phenomenon in classical fiber composite theory...
January 4, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29286327/assessment-of-the-possibility-of-using-unmanned-aerial-vehicles-uavs-for-the-documentation-of-hiking-trails-in-alpine-areas
#10
Paweł Ćwiąkała, Rafał Kocierz, Edyta Puniach, Michał Nędzka, Karolina Mamczarz, Witold Niewiem, Paweł Wiącek
The research described in this paper deals with the documentation of hiking trails in alpine areas. The study presents a novel research topic, applying up-to-date survey techniques and top quality equipment with practical applications in nature conservation. The research presents the initial part of the process-capturing imagery, photogrammetric processing, quality checking, and a discussion on possibilities of the further data analysis. The research described in this article was conducted in the Tatra National Park (TNP) in Poland, which is considered as one of the most-visited national parks in Europe...
December 29, 2017: Sensors
https://www.readbyqxmd.com/read/29280970/background-registration-based-adaptive-noise-filtering-of-lwir-mwir-imaging-sensors-for-uav-applications
#11
Byeong Hak Kim, Min Young Kim, You Seong Chae
Unmanned aerial vehicles (UAVs) are equipped with optical systems including an infrared (IR) camera such as electro-optical IR (EO/IR), target acquisition and designation sights (TADS), or forward looking IR (FLIR). However, images obtained from IR cameras are subject to noise such as dead pixels, lines, and fixed pattern noise. Nonuniformity correction (NUC) is a widely employed method to reduce noise in IR images, but it has limitations in removing noise that occurs during operation. Methods have been proposed to overcome the limitations of the NUC method, such as two-point correction (TPC) and scene-based NUC (SBNUC)...
December 27, 2017: Sensors
https://www.readbyqxmd.com/read/29258211/vision-based-target-finding-and-inspection-of-a-ground-target-using-a-multirotor-uav-system
#12
Ajmal Hinas, Jonathan M Roberts, Felipe Gonzalez
In this paper, a system that uses an algorithm for target detection and navigation and a multirotor Unmanned Aerial Vehicle (UAV) for finding a ground target and inspecting it closely is presented. The system can also be used for accurate and safe delivery of payloads or spot spraying applications in site-specific crop management. A downward-looking camera attached to a multirotor is used to find the target on the ground. The UAV descends to the target and hovers above the target for a few seconds to inspect the target...
December 17, 2017: Sensors
https://www.readbyqxmd.com/read/29248790/rewetting-in-mediterranean-reclaimed-peaty-soils-and-its-potential-for-phyto-treatment-use
#13
Vittoria Giannini, Andrea Bertacchi, Enrico Bonari, Nicola Silvestri
A pilot experimental field combining rewetting of reclaimed peaty soils and water phyto-treatment was set up in the Massaciuccoli Lake basin (Tuscany, Italy) to reduce the water eutrophication and peat degradation caused by almost a century of drainage-based agricultural use. In this paper, we investigated the restoration process occurring consequently to the conversion of a drained area in a natural wetland system (NWS) (the partial top soil removal, the realization of a perimeter levee to contain the waters, the rewetting with the drainage waters coming from the of surrounding cultivated areas) and the capability of the spontaneous vegetation to catch nutrients acting as a vegetation filter...
December 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29248157/relative-position-control-design-of-receiver-uav-in-flying-boom-aerial-refueling-phase
#14
Shuai An, Suozhong Yuan
This paper proposes the design of the relative position-keeping control of the receiver unmanned aerial vehicle (UAV) with the time-varying mass in the refueling phase utilizing an inner-outer loop structure. Firstly, the model of the receiver in the refueling phase is established. And then tank model is set up to analyze the influence of fuel transfer on the receiver. Subsequently, double power reaching law based sliding mode controller is designed to control receiver translational motion relative to tanker aircraft in the outer loop while active disturbance rejection control technique is applied to the inner loop to stabilize the receiver...
December 13, 2017: ISA Transactions
https://www.readbyqxmd.com/read/29234077/high-capacity-free-space-optical-communications-between-a-ground-transmitter-and-a-ground-receiver-via-a-uav-using-multiplexing-of-multiple-orbital-angular-momentum-beams
#15
Long Li, Runzhou Zhang, Zhe Zhao, Guodong Xie, Peicheng Liao, Kai Pang, Haoqian Song, Cong Liu, Yongxiong Ren, Guillaume Labroille, Pu Jian, Dmitry Starodubov, Brittany Lynn, Robert Bock, Moshe Tur, Alan E Willner
We explore the use of orbital-angular-momentum (OAM)-multiplexing to increase the capacity of free-space data transmission to moving platforms, with an added potential benefit of decreasing the probability of data intercept. Specifically, we experimentally demonstrate and characterize the performance of an OAM-multiplexed, free-space optical (FSO) communications link between a ground transmitter and a ground receiver via a moving unmanned-aerial-vehicle (UAV). We achieve a total capacity of 80 Gbit/s up to 100-m-roundtrip link by multiplexing 2 OAM beams, each carrying a 40-Gbit/s quadrature-phase-shift-keying (QPSK) signal...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29230229/high-throughput-phenotyping-of-plant-height-comparing-unmanned-aerial-vehicles-and-ground-lidar-estimates
#16
Simon Madec, Fred Baret, Benoît de Solan, Samuel Thomas, Dan Dutartre, Stéphane Jezequel, Matthieu Hemmerlé, Gallian Colombeau, Alexis Comar
The capacity of LiDAR and Unmanned Aerial Vehicles (UAVs) to provide plant height estimates as a high-throughput plant phenotyping trait was explored. An experiment over wheat genotypes conducted under well watered and water stress modalities was conducted. Frequent LiDAR measurements were performed along the growth cycle using a phénomobile unmanned ground vehicle. UAV equipped with a high resolution RGB camera was flying the experiment several times to retrieve the digital surface model from structure from motion techniques...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29224853/adaptive-sliding-mode-control-for-finite-time-stability-of-quad-rotor-uavs-with-parametric-uncertainties
#17
Omid Mofid, Saleh Mobayen
Adaptive control methods are developed for stability and tracking control of flight systems in the presence of parametric uncertainties. This paper offers a design technique of adaptive sliding mode control (ASMC) for finite-time stabilization of unmanned aerial vehicle (UAV) systems with parametric uncertainties. Applying the Lyapunov stability concept and finite-time convergence idea, the recommended control method guarantees that the states of the quad-rotor UAV are converged to the origin with a finite-time convergence rate...
December 7, 2017: ISA Transactions
https://www.readbyqxmd.com/read/29223818/application-of-airborne-photogrammetry-for-the-visualisation-and-assessment-of-contamination-migration-arising-from-a-fukushima-waste-storage-facility
#18
D T Connor, P G Martin, N T Smith, L Payne, C Hutton, O D Payton, Y Yamashiki, T B Scott
Airborne systems such as lightweight and highly portable unmanned aerial vehicles (UAVs) are becoming increasingly widespread in both academia and industry - with an ever-increasing range of applications, including (but not limited to), air quality sampling, wildlife monitoring and land-use mapping. In this work, high-resolution airborne photogrammetry obtained using a multi-rotor system operating at low survey altitudes, is combined with ground-based radiation mapping data acquired at an interim storage facility for wastes removed as part of the large-scale Fukushima clean-up program...
December 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29220714/mapping-of-radiation-anomalies-using-uav-mini-airborne-gamma-ray-spectrometry
#19
Ondřej Šálek, Milan Matolín, Lubomír Gryc
Localization of size-limited gamma-ray anomalies plays a fundamental role in uranium prospecting and environmental studies. Possibilities of a newly developed mini-airborne gamma-ray spectrometric equipment were tested on a uranium anomaly near the village of Třebsko, Czech Republic. The measurement equipment was based on a scintillation gamma-ray spectrometer specially developed for unmanned aerial vehicles (UAV) mounted on powerful hexacopter. The gamma-ray spectrometer has two 103 cm3 BGO scintillation detectors of relatively high sensitivity...
December 5, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29176860/identifying-species-from-the-air-uavs-and-the-very-high-resolution-challenge-for-plant-conservation
#20
Susana Baena, Justin Moat, Oliver Whaley, Doreen S Boyd
The Pacific Equatorial dry forest of Northern Peru is recognised for its unique endemic biodiversity. Although highly threatened the forest provides livelihoods and ecosystem services to local communities. As agro-industrial expansion and climatic variation transform the region, close ecosystem monitoring is essential for viable adaptation strategies. UAVs offer an affordable alternative to satellites in obtaining both colour and near infrared imagery to meet the specific requirements of spatial and temporal resolution of a monitoring system...
2017: PloS One
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