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Опубліковано: 14 березня 2023

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Статті в журналах з теми "UAS testbed"

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Moss, S. D., C. E. Davis, S. van der Velden, G. Jung, J. Smithard, C. Rosalie, P. Norman, et al. "A UAS Testbed for the Flight Demonstration of Structural Health Monitoring Systems." Procedia Engineering 188 (2017): 456–62. http://dx.doi.org/10.1016/j.proeng.2017.04.508.

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2

Szabó, András. "GNU Radio Based Testbed (GRaTe-BED) for Evaluating the Communication Link of Unmanned Aerial Systems." Acta Universitatis Sapientiae Electrical and Mechanical Engineering 8, no. 1 (December 1, 2016): 5–18. http://dx.doi.org/10.1515/auseme-2017-0001.

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Анотація:
AbstractUAS (Unmanned Aerial Systems) are commonly used in 3D (dull, dirty and dangerous) missions, because these are not endangering the operators life, while reduce maintenance costs and increase maneuvering capabilities. Despite of these advantages we should consider the possible vulnerabilities of this technology as well. Unmanned vehicles can be controlled via direct communication link, or they can work in a preprogrammed mode. Usually the preprogrammed mode is based on radio navigation systems, so we can draw a conclusion that both depend on the RF environment. In this paper I analyze a possibility to effectively evaluate the communication link of an UAS. Developers have to consider several key factors (type of operation, endurance, payload type and size, propulsion, communication link, etc.) during the development process. They are also responsible that the final product meets the predefined requirements. On the other side commercial UAS owners should have a possibility to compare and evaluate the UAS before the acquisition. Finally, operators and frequency management entities need tools to diagnose the possible sources of interference regarding the unmanned vehicles. To understand the consequences of interference in the RF spectrum we have to be able to measure the quality of the communication link in different usage scenarios. In my research I evaluate the usage of SDRs (Software Defined Radios) in RF Test and Evaluation processes. After analyzing the possibilities for a flexible testbed, I demonstrate the usability with some measurements in the GNU Radio signal processing framework.
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3

Sanchez-Aguero, Victor, Luis F. Gonzalez, Francisco Valera, Ivan Vidal, and Rafael A. López da Silva. "Cellular and Virtualization Technologies for UAVs: An Experimental Perspective." Sensors 21, no. 9 (April 29, 2021): 3093. http://dx.doi.org/10.3390/s21093093.

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Анотація:
The Unmanned Aircraft System (UAS) ecosystem is exponentially growing in both recreational and professional fields to provide novel services and applications to consumers from multiple engineering fields. However, this technology has only scraped the surface of its potential, especially in those cases that require fast reaction times. Accordingly, the UAS Traffic Management (UTM) project aims at efficiently managing the air traffic for Unmanned Aerial Vehicle (UAV) operations, including those cases where UAVs might be remotely managed from a completely different geographical location. With these considerations in mind, this article presents a cellular-assisted UAVs testbed used to complete a mission managed beyond the radio line-of-sight (BRLoS), as well as introducing a virtualization platform for deploying services using containerization technology. In addition, the article conducts a communication performance evaluation in order to determine if the testbed equipment meets the requirements to carry out this BRLoS management. Finally, indoor flight operations are carried out to demonstrate the feasibility and proper operation of the testbed.
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4

Vidal, Ivan, Paolo Bellavista, Victor Sanchez-Aguero, Jaime Garcia-Reinoso, Francisco Valera, Borja Nogales, and Arturo Azcorra. "Enabling Multi-Mission Interoperable UAS Using Data-Centric Communications." Sensors 18, no. 10 (October 12, 2018): 3421. http://dx.doi.org/10.3390/s18103421.

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We claim the strong potential of data-centric communications in Unmanned Aircraft Systems (UAS), as a suitable paradigm to enhance collaborative operations via efficient information sharing, as well as to build systems supporting flexible mission objectives. In particular, this paper analyzes the primary contributions to data dissemination in UAS that can be given by the Data Distribution Service (DDS) open standard, as a solid and industry-mature data-centric technology. Our study is not restricted to traditional UAS where a set of Unmanned Aerial Vehicles (UAVs) transmit data to the ground station that controls them. Instead, we contemplate flexible UAS deployments with multiple UAV units of different sizes and capacities, which are interconnected to form an aerial communication network, enabling the provision of value-added services over a delimited geographical area. In addition, the paper outlines an approach to address the issues inherent to the utilization of network-level multicast, a baseline technology in DDS, in the considered UAS deployments. We complete our analysis with a practical experience aiming at validating the feasibility and the advantages of using DDS in a multi-UAV deployment scenario. For this purpose, we use a UAS testbed built up by heterogeneous hardware equipment, including a number of interconnected micro aerial vehicles, carrying single board computers as payload, as well as real equipment from a tactical UAS from the Spanish Ministry of Defense.
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Mannaru, Pujitha, Balakumar Balasingam, Krishna Pattipati, Ciara Sibley, and Joseph Coyne. "Cognitive Context Detection for Adaptive Automation." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 60, no. 1 (September 2016): 223–27. http://dx.doi.org/10.1177/1541931213601050.

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Анотація:
An important research challenge in Human Machine Systems (HMS) is to create machines that are able to better understand human behavior so that the overall efficiency of the HMS can be enhanced through increased productivity and reduced safety risk. The research question posed in this paper is the following: Can an understanding of physiological behavior of humans be combined with statistical machine learning theory to develop predictive models that are able to accurately predict the cognitive difficulty experienced by humans? In this paper, we answer this question in the affirmative by demonstrating the use of two physiological measurements, pupil dilation and eye-gaze patterns, as indices of cognitive workload. Specifically, we demonstrate the possibility of cognitive context detection through machine learning and classification using eye-tracking data from NRL’s Supervisory Control Operations User Testbed (SCOUTTM), a flexible simulation environment that represents the tasks that a future UAS operator would engage in, while controlling multiple UAS.
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Douklias, Athanasios, Lazaros Karagiannidis, Fay Misichroni, and Angelos Amditis. "Design and Implementation of a UAV-Based Airborne Computing Platform for Computer Vision and Machine Learning Applications." Sensors 22, no. 5 (March 6, 2022): 2049. http://dx.doi.org/10.3390/s22052049.

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Анотація:
Visual sensing of the environment is crucial for flying an unmanned aerial vehicle (UAV) and is a centerpiece of many related applications. The ability to run computer vision and machine learning algorithms onboard an unmanned aerial system (UAS) is becoming more of a necessity in an effort to alleviate the communication burden of high-resolution video streaming, to provide flying aids, such as obstacle avoidance and automated landing, and to create autonomous machines. Thus, there is a growing interest on the part of many researchers in developing and validating solutions that are suitable for deployment on a UAV system by following the general trend of edge processing and airborne computing, which transforms UAVs from moving sensors into intelligent nodes that are capable of local processing. In this paper, we present, in a rigorous way, the design and implementation of a 12.85 kg UAV system equipped with the necessary computational power and sensors to serve as a testbed for image processing and machine learning applications, explain the rationale behind our decisions, highlight selected implementation details, and showcase the usefulness of our system by providing an example of how a sample computer vision application can be deployed on our platform.
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7

Nekrasov, Michael, Ryan Allen, Irina Artamonova, and Elizabeth Belding. "Optimizing 802.15.4 Outdoor IoT Sensor Networks for Aerial Data Collection." Sensors 19, no. 16 (August 9, 2019): 3479. http://dx.doi.org/10.3390/s19163479.

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Анотація:
Rural IoT sensor networks, prevalent in environmental monitoring and precision agriculture, commonly operate over some variant of the IEEE 802.15.4 standard. Data collection from these networks is often challenging, as they may be deployed in remote regions where existing backhaul infrastructure is expensive or absent. With the commercial and industrial success of Unmanned Aircraft Systems (UAS), there is understandable interest in using UASs for delay tolerant data collection from 802.15.4 IoT sensor networks. In this study, we investigate how to optimize 802.15.4 networks for aerial data collection, which, unlike other wireless standards, has not received rigorous evaluation for three-dimensional aerial communication. We analyze experimental measurements from an outdoor aerial testbed, examining how factors, such as antenna orientation, altitude, antenna placement, and obstruction, affect signal strength and packet reception rate. In our analysis, we model and predict the quality of service for aerial data collection, based on these network configuration variables, and contrast that with the Received Signal Strength Indication (RSSI)—a commonly used signal strength metric. We find that network configuration plays a significant role in network quality, which RSSI, a mediator variable, struggles to account for in the presence of high packet loss. We conclude with a discussion of strategies for optimizing sensor network configuration for aerial data collection, in light of our results.
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TREMBLAY, JEAN-FRANÇOIS. "DISCOVERED IN ASIA, TESTED IN THE U.S." Chemical & Engineering News 87, no. 40 (October 5, 2009): 24–25. http://dx.doi.org/10.1021/cen-v087n040.p024.

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Sibley, Ciara, Joseph Coyne, and Jim Thomas. "Demonstrating the Supervisory Control Operations User Testbed (SCOUT)." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 60, no. 1 (September 2016): 1324–28. http://dx.doi.org/10.1177/1541931213601306.

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Анотація:
The proliferation of unmanned systems and the large crew compliment involved in operating a single UAV has created a manpower problem in the U.S. military and resulted in a desire to enable supervisory control of future systems. The Supervisory Control Operations User Testbed (SCOUTTM) is a flexible research testbed developed by the Naval Research Laboratory (NRL) to investigate human performance and automation challenges involved in realizing this future supervisory control vision. As such, SCOUT was designed to with input from UAV operators to increase ecological validity and represent the complexity, noise and uncertainty associated with unmanned system control. SCOUT enables the investigation of various psychological phenomena, including decision making (e.g., route planning under uncertainty), attention allocation (e.g., where and when to focus effort and attention), and mission monitoring, (e.g., maintaining vigilance). Furthermore, SCOUT incorporates eye tracking and physiological monitoring to provide metrics of operator state when performance metrics are limited, which is often the case in real world operations when the operator is only passively monitoring the system. This paper and its associated demonstration will provide an overview of the various components of SCOUT and aims to encourage other researchers to take advantage of this free software for conducting their own experimentation.
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Allen, John, and Brian Walsh. "ENHANCED OIL SPILL SURVEILLANCE, DETECTION AND MONITORING THROUGH THE APPLIED TECHNOLOGY OF UNMANNED AIR SYSTEMS." International Oil Spill Conference Proceedings 2008, no. 1 (May 1, 2008): 113–20. http://dx.doi.org/10.7901/2169-3358-2008-1-113.

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Анотація:
ABSTRACT Many leading edge technologies that are conceptualized, developed, tested, refined and applied as military defense technologies evolve into useful applied technologies in other public and private sectors. Unmanned Air Systems (UAS) and the rapidly evolving Small Unmanned Air Vehicle (SUAS) are finding operational applications in scientific research, wildlife, law enforcement, security, natural disaster, and environmental surveillance, detection and monitoring. This paper will review the use of UAS in operational oil spill surveillance, monitoring and assessment. UAS show particular potential for shoreline, coastal and inland surveillance and monitoring of remote areas with limited accessibility. Numerous international oil companies have sponsored UAV demonstrations focused on facility and pipeline inspection, surveillance and monitoring. Governmental agencies, including the U.S. Coast Guard and National Oceanic and Atmospheric Agency, have incorporated UAS into oil spill response exercises and test applications. Currently, many areas of high risk to pollution and high environmental sensitivity are monitored daily by costly manned aircraft surveillance; UAS can replace or augment these manned air vehicles, providing a cost effective alternative that also reduces human risks. UAS technology is continually evolving to achieve broader application:On-water launch and in-water recovery;Payload Integration - video, still daylight and nighttime IR imaging, image processing, and hazardous material air plume sensing and mapping;Command, Control and Communications (C-3) - real-time data link to the Incident Command Post;Platform Improvements - greater reliability, minimized size and weight, portability, longer operational flight time and extended range, and improved power sources;GPS positioning - pre-programmed flight patterns and break-away vectoring; andSimulation & Training - train effectively, maintain proficiency, and evolve tactics, techniques and procedures.
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Більше джерел

Дисертації з теми "UAS testbed"

1

Ng, Jennifer. "Investigation of a low-cost coaxial helicopter testbed for planetary remote sensing." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/228525/1/Jennifer_Ng_Thesis.pdf.

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Анотація:
This project was a step forward in designing and testing a low-cost coaxial UAV with an optical flow sensor. The research is based on the Mars Helicopter Ingenuity used in planetary remote sensing. The thesis investigated how accurately the UAV can maintain altitude using VICON, LIDAR, and the optical flow sensor.
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2

Cakir, Zeynep. "Development Of A Uav Testbed." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613209/index.pdf.

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Анотація:
The development and testing for a UAV testbed to be used in academic research and undergraduate education is proposed in this thesis. Analysis on commercial off-the-shelf UAV systems and autopilots lead to the development of a custom, open-architecture and modular UAV testbed. The main focus is to support research in UAV control field and education of the undergraduate students. The integration and use of commercial-off-the-shelf avionics and air vehicle are described in detail. System performance is examined both in flight and on the ground. Results of the system tests show that the developed system is a functional UAV testbed to be used in research of different flight control algorithms.
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3

Klingstein, Axel. "Multi-Agent Testbed development, modelling and control of Quadrotor UAVs." Thesis, KTH, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102159.

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Анотація:
Quadrotor Unmanned Aerial Vehicles (UAVs) have been an area of great interest for academic research at several universities around the world. They provide an interesting platform for research into various control related areas such as modelling, testing dierent control strategies or cooperative behaviour and possible real-world applications within search-and-rescue, trac surveillance and many other areas with the potential to improve everyday life. In this thesis, the process of designing and implementing a testbed that allows for practical multi-agent control related experiments with Quadrotor UAVs is described. The testbed consists of a centralized controller PC, a positioning system for determining the quadrotors position in space and a bi-directional wireless link for communicating with the quadrotors. The controller PC software in LabVIEW and the various interfaces to the subsystems in C, C # and under TinyOS are implemented considering the main goal to have a robust platform that allows for quick testing and debugging of dierent control algorithms. To be able to perform simulation and understand the dynamic behaviour of the quadrotors, a mathematical model is derived. The model is then used to design PID and LQR controllers that allow the quadrotors to track a position in space. The functionality of the testbed, the performance of the controllers and the validity of the model is successfully evaluated by ight-testing the quadrotors using the testbed and verifying that simulation results are in accordance with the real-world results that are obtained.
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4

King, Ellis T. (Ellis Taylor) 1979. "Distributed coordination and control experiments on a multi-UAV testbed." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28894.

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Анотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2004.
Includes bibliographical references (p. 153-157).
(cont.) of environmental disturbances and measurement noise.The product of this thesis is a robust planning system that is tolerant of the types of uncertainty experienced by real aircraft. This robustness has been demonstrated by more than 20 successful flights on a fully automated UAV testbed.
This thesis presents the development and testing of a unique testbed consisting of a fleet of eight unmanned aerial vehicles (UAVs) that was designed as a platform for evaluating coordination and control algorithms. A hierarchical configuration of task assignment, trajectory design, and low-level, waypoint following, are used in a receding horizon framework to control the UAV system. Future UAV teams will have to autonomously demonstrate cooperative behaviors in dynamic and uncertain environments, and this testbed can be used to compare various control approaches to accomplish these coordinated missions. Flight demonstrations are made utilizing real-time mixed-integer linear programming techniques, exercising the algorithms in realistic environments with real-world disturbances. Large disturbance sources, computational delay and measurementnoise all represent significant error sources that reduce the ability of UAV teams to interact in a coordinated fashion by increasing uncertainty on higher planning levels. This thesis develops a method that explicitly accounts for this uncertainty by including feedback loops on the task assignment and trajectory design algorithms to prescribe added robustness for the uncertainty at each stage. This approach takes into account low level controller saturation limits that might cause infeasibilities in the plans created at the higher levels of the planning system. Detailed and realistic simulation environments are useful for large-scale multi-vehicle simulations, particularly when logistics prevent flight testing on that scale. This thesis validates one such hardware-in-the-loop simulation environment through the comparison of models obtained from experimentally collected flight data and detailed modeling
by Ellis T. King.
S.M.
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5

Jahan, Farha. "Implementation of GNSS/GPS Navigation and its Attacks in UAVSim Testbed." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430224295.

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6

Lains, João Luís da Silva. "Testing the random walk hypothesis with variance ratio statistics." Master's thesis, Instituto Superior de Economia e Gestão, 2015. http://hdl.handle.net/10400.5/11801.

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Анотація:
Mestrado em Finanças
Esta dissertação tem como objetivo testar a hipótese de passeio aleatório na curva das yields relativa ás obrigações do tesouro dos Estados Unidos da América para o period entre 1980 e 2014. Para alcançar este objetivo e após revisão da literatura foram efectuados testes de variância e de raiz unitária considerados os mais indicados e poderosos. Os dados necessários para a realização deste estudo foram recolhidos tendo por base um estudo da Reserva Federal dos Estados Unidos da América, que efectua cálculo das yields desde 1961 até ao presente. O método escolhido para obter os resultados referentes à raiz unitária foi o Augmented Dickey-Fuller Unit Root Test e para os testes de variância foram usados: Chow Denning (1993) multiple variance test, Joint wright multiple version of Wrights rank and sign tests e Choi (1999) Automatic Variance ratio. A amostra inclui mais de 8000 observações para cada uma das yields estudadas(1,5,10 e 20 anos Zero-Coupon e Par Yields) durante um período de 34 anos. Os resultados permitiram a detecção de diversos periodos em que o passeio aleatório nas yields das obrigações do tesouro Norte-Americano é real mas também outros em que isso não se verificou. Para isso efectuámos uma análise comparativa entre os resultados dos testes de variância e eventos marcantes na economia americana entres os quais decidimos destacar 3 períodos: a década de 80, a expansao económica dos anos 90 até inicio do século XXI e o pós-crise de 2008 onde é implementado o quantitative Easing.
The random-walk hypothesis in the U.S. treasury yield curve was not previous studied and is surprising that researchers do not filled that void by testing it. However, the U.S treasury securities market is a benchmark, as the U.S treasury is considered to be risk-free. This benchmark is used to forecast economic development, to analyse securities in other markets, to price other fixed-income securities and to hedge positions taken in other markets. This study applies Chow Denning (1993) multiple variance test, Joint wright multiple version of Wright?s rank and sign tests, Choi (1999) Automatic Variance ratio Test and we also use the well-known Augmented Dickey-Fuller unit roots test to enable us to define the methodology to be used in the study. The database used permits the estimation of relative daily variation on U.S. treasury yield curve from January 1980 to December 2014. We hope that this analysis can provide useful information to traders and investors and will make a contribution in assisting to understand the pattern and behaviour of yields movement.
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7

Vilaça, João. "Desenho, implementação e análise de um RPAS com condutas." Master's thesis, Academia da Força Aérea; Instituto Superior Técnico, 2018. http://hdl.handle.net/10400.26/40266.

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Анотація:
Orientador(es): Doutor Alberto Manuel Martinho Vale; Professor Filipe Szolnoky Ramos Pinto Cunha; Júri: Orientador: Professor Filipe Szolnoky Ramos Pinto Cunha
Este trabalho visa demonstrar o processo de desenvolvimento de um veículo aéreo não tripulado (VANT), do tipo multi-rotor. Este Veículo poderá servir para suprimir algumas lacunas existentes na inspeção radiológica realizada pelo Instituto de Plasmas e Fusão Nuclear (IPFN), sediado no Instituto Superior Técnico (IST), em Lisboa. Nomeadamente, o recurso a aeronaves, com características superiors às existentes na atualidade, para inspeção radiológica. É feito um estudo para otimizar a aeronave no que respeita aos componentes e número de motores a utilizar. É ainda feito um estudo sobre as melhorias adjacentes à introdução de uma conduta à volta das hélices. Face aos resultados, teoricamente vantajosos, as condutas são projetadas e, após um processo iterativo, construídas. Posteriormente à construção das condutas são feitos testes estáticos com o objetivo de confirmar as vantagens teoricamente existentes. Estes testes visam a verificação dos benefícios da introdução da conduta na ausência de efeito de solo, na presença de efeito de solo, na aproximação a cantos ou paredes e a aproximação a obstáculos presentes num plano superior ao do rotor. Os resultados dos testes verificam que, apesar de o efeito da conduta não ser tão vantajoso quanto a teoria anuncia, a conduta é vantajosa. Verifica-se que a introdução da conduta impõe mais benefícios na presença do efeito de solo. Nos restantes testes, apesar da presença da conduta não trazer muitas vantagens, esta configuração tem um melhor desempenho do que a hélice sem conduta. Ou seja, apresenta um maior impulso debitado e menor potência consumida.
This work seeks to demonstrate the development process of a multi-rotor UAV. This vehicle is aimed to suppress some gaps that might exist in radiological inspection performed by IPFN (Instituto de Plasmas e Fusão Nuclear), located at IST (Instituto Superior Técnico), in Lisbon. Namely, the use of aircrafts, with superior characteristics compared with the state of the art, for radiological inspection. A research is made in order to optimise the aircraft regarding its components and number of motors to use. Also, a review is done over the benefit of using ducted propellers. Regarding the theoretically advantageous results, the ducts are designed and after an iterative process, are built. Having the ducts ready to be used, static tests were performed to verify the theoretical results, previously calculated. These aimed to verify the benefits of using a duct out of the ground effect, in the ground effect, near corners or walls, and at the closeness to obstacles in a superior level to the rotor. The tests results allow to conclude that, however the duct is not as good as theoretically expected, it is indeed advantageous. The duct usage comprehend more benefits when in the presence of the ground effect. In the remaining experiments, despite not being really advantageous, the ducted fan have a superior performance than the free rotor. Which means, higher thrust and lower power consumption.
N/A
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8

Busacca, Fabio Antonino. "AI for Resource Allocation and Resource Allocation for AI: a two-fold paradigm at the network edge." Doctoral thesis, Università degli Studi di Palermo, 2022. https://hdl.handle.net/10447/573371.

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Анотація:
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 improve the network performance in terms of responsiveness, throughput, and power consumption. However, networks in the so-called Age of Big Data result from the dynamic interactions of massive amounts of heterogeneous devices. As a consequence, traditional model-based Resource Allocation algorithms fail to cope with this dynamic and complex networks, and are being replaced by more flexible AI-based techniques as a result. In such a way, it is possible to design intelligent resource allocation frameworks, able to quickly adapt to the everchanging dynamics of the network edge, and to best exploit the few available resources. Hence, Artificial Intelligence (AI), and, more specifically Machine Learning (ML) techniques, can clearly play a fundamental role in boosting and supporting resource allocation techniques at the edge. But can AI/ML benefit from optimal Resource Allocation? Recently, the evolution towards Distributed and Federated Learning approaches, i.e. where the learning process takes place in parallel at several devices, has brought important advantages in terms of reduction of the computational load of the ML algorithms, in the amount of information transmitted by the network nodes, and in terms of privacy. However, the scarceness of energy, processing, and, possibly, communication resources at the edge, especially in the IoT case, calls for proper resource management frameworks. In such a view, the available resources should be assigned to reduce the learning time, while also keeping an eye on the energy consumption of the network nodes. According to this perspective, a two-fold paradigm can emerge at the network edge, where AI can boost the performance of Resource Allocation, and, vice versa, optimal Resource Allocation techniques can speed up the learning process of AI algorithms. Part I of this work of thesis explores the first topic, i.e. the usage of AI to support Resource Allocation at the edge, with a specific focus on two use-cases, namely UAV-assisted cellular networks, and vehicular networks. Part II deals instead with the topic of Resource Allocation for AI, and, specifically, with the case of the integration between Federated Learning techniques and the LoRa LPWAN protocol. The designed integration framework has been validated on both simulation environments, and, most importantly, on the Colosseum platform, the biggest channel emulator in the world.
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9

Anyanwu, Ezechukwu John. "The Effect of Flow on the Development and Retention of Iron Sulfide Corrosion ProductLayers." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1547118739941844.

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10

Colucci, Lamont Cary. "Liberation tested U.S. Foreign policy--involvement and reaction to the 1953 uprising in East Germany and the 1956 revolution in Hungary /." 1989. http://catalog.hathitrust.org/api/volumes/oclc/20863909.html.

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Анотація:
Thesis (M.A.)--University of Wisconsin--Madison, 1989.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 91-95).
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Книги з теми "UAS testbed"

1

Moffitt, Robert. Economic effects of means-tested transfers in the U.S. Cambridge, MA: National Bureau of Economic Research, 2002.

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2

N, Baez Anastacio, and United States. National Aeronautics and Space Administration., eds. Power system monitoring and source control of the Space Station Freedom DC Power System Testbed. [Washington, DC: National Aeronautics and Space Administration, 1992.

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3

All cakes considered: A year's worth of recipes tested, tasted, and approved by the staff of NPR's All things considered. San Francisco, Calif: Chronicle Books, 2009.

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4

1939-, Dyer Lee, and Human Resource Planning Society, eds. Human resource planning: Tested practices of five major U.S. and Canadian companies : a case study reference guide. New York: Human Resource Planning Society, 1986.

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5

Office, General Accounting. Welfare to work: State programs have tested some of the proposed reforms : report to the Honorable Daniel Patrick Moynihan, U.S. Senate. Washington, D.C: The Office, 1995.

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6

Neumark, David. The effect of means-tested income support for the elderly on pre-retirement saving: Evidence from the SSI program in the U.S. Cambridge, MA: National Bureau of Economic Research, 1997.

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7

U.S. Army Engineer School and U.S. Army Training Support Center. Reserve Schools Division, eds. 52D10 power generation equipment repairer, skill level I: Use the optical battery/anti-freeze tester : student guide for U.S. Army Reserve Schools. Fort Eustis, VA: U S Army Training Support Center, Reserve Schools Division, 1986.

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8

U.S. Army Engineer School. and U.S. Army Training Support Center. Reserve Schools Division., eds. 52D10 power generation equipment repairer, skill level I: Use the optical battery/anti-freeze tester : student guide for U.S. Army Reserve Schools. Fort Eustis, VA: U S Army Training Support Center, Reserve Schools Division, 1986.

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9

U.S. Army Engineer School. and U.S. Army Training Support Center. Reserve Schools Division., eds. 52D10 power generation equipment repairer, skill level I: Use the optical battery/anti-freeze tester : student guide for U.S. Army Reserve Schools. Fort Eustis, VA: U S Army Training Support Center, Reserve Schools Division, 1986.

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Groshev, Igor', Yuliya Davydova, and Anton Gorbenko. Psychology of regional elections: candidates and voters. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1163948.

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The monograph is devoted to the study of the socio-psychological features of regional elections that influence the socio-political behavior of the electorate. The authors propose a new understanding of the psychological nature of the processes of forming the voting choice, which brings us closer to a more correct understanding of the complex political and psychological mechanisms of the strategy and tactics of regional election campaigns. The identified individual and personal indicators of the influence of the electoral characteristics of candidates on the voting of various categories of voters were developed and tested at the regional level. A number of practical recommendations on the organization of election campaigns, designed to take into account the psychological specifics of the behavior of the electorate in the framework of regional elections (elections with weak content), are empirically proved. It is intended for managers and specialists of regional election commissions, political scientists and psychologists who study issues related to the patterns of electoral behavior, graduate students and undergraduates engaged in research in the field of political psychology, as well as political strategists who ensure the effectiveness of election campaigns.
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Частини книг з теми "UAS testbed"

1

Berger, Guido S., Alexandre Oliveira Júnior, João Braun, José Lima, Milena F. Pinto, António Valente, Ana I. Pereira, Álvaro R. Cantieri, and Marco A. Wehrmeister. "Sensorial Testbed for High-Voltage Tower Inspection with UAVs." In ROBOT2022: Fifth Iberian Robotics Conference, 353–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-21062-4_29.

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2

Ferrari, Domenico. "Programs for Networking Research and Testbed Activities in the U.S." In Informatik aktuell, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79561-9_1.

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3

Hardina, Donna. "Workfare in the U.S.: Empirically-Tested Programs or Ideological Quagmire?" In Workfare, edited by Eric Shragge, 131–48. Toronto: University of Toronto Press, 1997. http://dx.doi.org/10.3138/9781442603110-009.

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4

Stark, Philip B., and Ran Xie. "They May Look and Look, Yet Not See: BMDs Cannot be Tested Adequately." In Electronic Voting, 122–38. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15911-4_8.

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AbstractBugs, misconfiguration, and malware can cause ballot-marking devices (BMDs) to print incorrect votes. Several approaches to testing BMDs have been proposed. In logic and accuracy testing (LAT) and parallel or live testing, auditors input known test votes into the BMD and check whether the printout matches. Passive testing monitors the rate at which voters “spoil” BMD printout, on the theory that if BMDs malfunction, the rate will increase noticeably. We provide lower bounds that show that these approaches cannot reliably detect outcome-altering problems, because: (i) The number of possible voter interactions with BMDs is enormous, so testing interactions uniformly at random is hopeless. (ii) To probe the space of interactions intelligently requires an accurate model of voter behavior, but because the space of interactions is so large, building a sufficiently accurate model requires observing an enormous number of voters in every jurisdiction in every election—more voters than there are in most U.S. jurisdictions. (iii) Even with a perfect model of voter behavior, the required number of tests exceeds the number of voters in most U.S. jurisdictions. (iv) An attacker can target interactions that are intrinsically expensive to test, e.g., because they involve voting slowly; or interactions for which tampering is less likely to be noticed, e.g., because the voter uses the audio interface. (v) Whether BMDs misbehave or not, the distribution of spoiled ballots is unknown and varies by election and possibly by ballot style: historical data do not help much. Hence, there is no way to calibrate a threshold for passive testing, e.g., to guarantee at least a 95% chance of noticing that 5% of the votes were altered, with at most a 5% false alarm rate. (vi) Even if the distribution of spoiled ballots were known to be Poisson, the vast majority of jurisdictions do not have enough voters for passive testing to have a large chance of detecting problems but only a small chance of false alarms.
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5

Ylimaki, Rose M., and Lynnette A. Brunderman. "School Development Approaches Over Time: Strengths, Limitations, and the Need for a New Approach." In Evidence-Based School Development in Changing Demographic Contexts, 3–21. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76837-9_1.

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AbstractAcross the globe, we observe policy trends towards evidence-based school development, “scientific” research, and increasingly centralized curriculum, all occurring amidst growing digitalization and demographic changes resulting in increasingly pluralistic schools and communities. As a result of these policy pressures, many universities and other educational organizations have proposed various evidence-based school development models or projects aimed at continuous improvement. In this chapter, we contest evidence produced from quasi-experimental research designs with other empirically tested evidence. We critique several established school development programs across the U.S. Finally, we propose that in order to have school capacity for continuous development, we need a school development process that is contextually-based and able to consider, reflect upon and use data from evidence-based programs and other sources as appropriate for school-identified problems, and that schools must be able to evaluate their own programs and processes in their particular contexts, with particular populations. For this, we need school development grounded in understandings of education and leadership as well as evidence. For our purposes, we define school development as a continuous growth process for school teams supporting education amidst tensions between policy expectations for use of research-driven evidence and the needs of students in increasingly diverse contexts.
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6

Aburasain, R. Y., E. A. Edirisinghe, and M. Y. Zamim. "A Coarse-to-Fine Multi-class Object Detection in Drone Images Using Convolutional Neural Networks." In Digital Interaction and Machine Intelligence, 12–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11432-8_2.

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AbstractMulti-class object detection has a rapid evolution in the last few years with the rise of deep Convolutional Neural Networks (CNNs) learning based, in particular. However, the success approaches are based on high resolution ground level images and extremely large volume of data as in COCO and VOC datasets. On the other hand, the availability of the drones has been increased in the last few years and hence several new applications have been established. One of such is understanding drone footage by analysing, detecting, recognizing different objects in the covered area. In this study conducted, a collection of large images captured by a drone flying at a fixed altitude in a desert area located within the United Arab Emirates (UAE) is given and it is utilised for training and evaluating the CNN networks to be investigated. Three state-of-the-art CNN architectures, namely SSD-500 with VGGNet-16 meta-architecture, SSD-500 with ResNet meta-architecture and YOLO-V3 with Darknet-53 are optimally configured, re-trained, tested and evaluated for the detection of three different classes of objects in the captured footage, namely, palm trees, group-of-animals/cattle and animal sheds in farms. Our preliminary experiments revealed that YOLO-V3 outperformed SSD-500 with VGGNet-16 by a large margin and has a considerable improvement as compared to using SSD-500 with ResNet. Therefore, it has been selected for further investigation, aiming to propose an efficient coarse-to-fine object detection model for multi-class object detection in drone images. To this end, the impact of changing the activation function of the hidden units and the pooling type in the pooling layer has been investigated in detail. In addition, the impact of tuning the learning rate and the selection of the most effective optimization method for general hyper-parameters tuning is also investigated. The result demonstrated that the multi-class object detector developed has precision of 0.99, a recall of 0.94 and an F-score of 0.96, proving the efficiency of the multi-class object detection network developed.
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7

Espinoza-Fraire, Arturo Tadeo, Alejandro Enrique Dzul López, Ricardo Pavel Parada Morado, and José Armando Sáenz Esqueda. "Testbed and experimental results." In Design of Control Laws and State Observers for Fixed-Wing UAVs, 121–70. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-32-395405-1.00016-9.

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Gramse, Nils, Moritz Roidl, Shrutarv Awasthi, and Christopher Reining. "3.7 Micro-UAV Swarm Testbed for Indoor Applications." In Applications, 212–24. De Gruyter, 2022. http://dx.doi.org/10.1515/9783110785982-020.

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9

Abdelkader, Mohamed, Usman A. Fiaz, Noureddine Toumi, Mohamed A. Mabrok, and Jeff S. Shamma. "RISCuer: a reliable multi-UAV search and rescue testbed." In Unmanned Aerial Systems, 345–74. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820276-0.00021-2.

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Zhang, Youmin, and Abbas Chamseddine. "Fault Tolerant Flight Control Techniques with Application to a Quadrotor UAV Testbed." In Automatic Flight Control Systems - Latest Developments. InTech, 2012. http://dx.doi.org/10.5772/38918.

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Тези доповідей конференцій з теми "UAS testbed"

1

Sward, Ricky E., Qian Hu, Jason Letourneau, Galen Williamson, and Chris Jella. "Integrating the UAS Intelligent Analyzer for lost link comm into a UAS testbed." In 2011 IEEE/AIAA 30th Digital Avionics Systems Conference (DASC). IEEE, 2011. http://dx.doi.org/10.1109/dasc.2011.6095920.

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2

Sward, Ricky, Qian Hu, Chris Jella, Jason Letourneau, and Galen Williamson. "Integrating the UAS intelligent analyzer for lost link comm into a UAS testbed." In 2011 IEEE/AIAA 30th Digital Avionics Systems Conference (DASC). IEEE, 2011. http://dx.doi.org/10.1109/dasc.2011.6096240.

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3

Kurum, Mehmet, Ali Gurbuz, Spencer Barnes, Dylan Boyd, Matt Duck, Md Mehedi Farhad, Austin Flynt, et al. "A UAS-based RF testbed for water utilization in agroecosystems." In Autonomous Air and Ground Sensing Systems for Agricultural Optimization and Phenotyping VI, edited by J. Alex Thomasson and Alfonso F. Torres-Rua. SPIE, 2021. http://dx.doi.org/10.1117/12.2591895.

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4

Amador, J. M., J. R. Martinez de Dios, J. L. Paneque, and A. Ollero. "An Agile Low-cost Testbed for Multi-Drone Target Tracking." In 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS). IEEE, 2019. http://dx.doi.org/10.1109/reduas47371.2019.8999718.

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5

Pereira, Diego S., Vitor G. Santos, Luís B. P. Nascimento, and Pablo J. Alsina. "Experimental Results Analyzes in Resilient Mechanism for SDN-Based UAV Network Applied to Environmental Protection Area Surveillance." In Workshop de Testes e Tolerância a Falhas. Sociedade Brasileira de Computação - SBC, 2022. http://dx.doi.org/10.5753/wtf.2022.223443.

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A surveillance system requires repetitive and uninterrupted actions, typically related to large extension places, and difficult access. In this context, a multiple Unmanned Aerial Vehicles (multi-UAV) system is a good alternative for overcoming the requirements imposed by this application. With this in mind, the UAVs have to work cooperatively and exchange information to finish the mission. However, managing and keeping the communication between UAVs is a challenge that has been investigated. So, the SD-FANET is an SDN architecture developed to mitigate this communication problem. SD-FANET has a hierarchical distributed control plane that provides a resilience mechanism to overcome failures during a mission runtime. The three-step strategy (detection, election, and recovery) allows the control plane outperforms failures and works continuously as long as there are nodes in the UAV network. Experimental tests were performed in three scenarios. In all of them, the controller executed the resilience mechanism and keep going working. The mean time was 1,94 seconds to 300 executions. The PDF of results was similar to a normal distribution demonstrating the behavior of the recovery time.
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6

Moulds, Thomas. "Evaluation Testbed for Autonomous Technology." In 1st UAV Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3408.

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7

Zhao, Weihua, and Chiew Soon Hooi. "UWB System Based UAV Swarm Testbed." In 2020 16th International Conference on Control, Automation, Robotics and Vision (ICARCV). IEEE, 2020. http://dx.doi.org/10.1109/icarcv50220.2020.9305401.

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8

Motter, Mark, James High, Nelson Guerreiro, Ryan Chambers, and Keith Howard. "A Turbine-powered UAV Controls Testbed." In AIAA Infotech@Aerospace 2007 Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-2751.

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9

Zhao, Weihua, and Chiew Soon Hooi. "UWB System Based UAV Swarm Testbed." In 2020 16th International Conference on Control, Automation, Robotics and Vision (ICARCV). IEEE, 2020. http://dx.doi.org/10.1109/icarcv50220.2020.9305401.

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10

Brech, Dale E., and Randy C. Hoover. "Development of a Virtual Reality Simulation Testbed for Collaborative UGV and UAV Research Using MATLAB." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65045.

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This paper presents a virtual reality simulation testbed for evaluation of collaborative control efforts using unmanned ground vehicles (UGV) and unmanned aerial vehicles (UAV). The UGVs are governed by differential drive vehicle kinematics, while the nonlinear dynamics of a quadrotor UAV are implemented. In addition, the system is built with modularity in mind so as to allow for easy expansion of multiple UGVs and UAVs working in collaboration. Such a simulation system allows for research in vehicle control, path planning, formation structures, and centralized/distributed control topologies to be easily and cost effectively explored. As a bonus, virtual cameras are mounted on each vehicle allowing exploration into control using visual feedback mechanisms. This paper describes the simulation testbed architecture, implementation of the dynamics and extended Kalman filter observers, and base-line control laws developed for stabilization and tracking.
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Звіти організацій з теми "UAS testbed"

1

Claus, Ana, Borzooye Jafarizadeh, Azmal Huda Chowdhury, Neziah Pala, and Chunlei Wang. Testbed for Pressure Sensors. Florida International University, October 2021. http://dx.doi.org/10.25148/mmeurs.009771.

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Currently, several studies and experiments are being done to create a new generation of ultra-low-power wearable sensors. For instance, our group is currently working towards the development of a high-performance flexible pressure sensor. However, with the creation of new sensors, a need for a standard test method is necessary. Therefore, we opted to create a standardized testbed to evaluate the pressure applied to sensors. A pulse wave is generated when the heart pumps blood causing a change in the volume of the blood vessel. In order to eliminate the need of human subjects when testing pressure sensors, we utilized polymeric material, which mimics human flesh. The goal is to simulate human pulse by pumping air into a polymeric pocket which s deformed. The project is realized by stepper motor and controlled with an Arduino board. Furthermore, this device has the ability to simulate pulse wave form with different frequencies. This in turn allows us to simulate conditions such as bradycardia, tachycardia, systolic pressure, and diastolic pressure.
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2

Moffitt, Robert. Economic Effects of Means-Tested Transfers in the U.S. Cambridge, MA: National Bureau of Economic Research, January 2002. http://dx.doi.org/10.3386/w8730.

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3

Kirby S. Chapman, Prakash Krishniswami, Virg Wallentine, Mohammed Abbaspour, Revathi Ranganathan, Ravi Addanki, Jeet Sengupta, and Liubo Chen. Virtual Pipeline System Testbed to Optimize the U.S. Natural Gas Transmission Pipeline System. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/861668.

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4

How, Jonathan. Report on the AFOSR Workshop on UAV Testbeds and Simulations. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada435759.

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5

Kesavan, Jana S., Deborah Schepers, and Jerold Bottiger. Characteristics of Twenty-Nine Aerosol Samplers Tested at U.S. Army Edgewood Chemical Biological Center (2000-2006). Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada540009.

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6

Neumark, David, and Elizabeth Powers. The Effect of Means-Tested Income Support for the Elderly on Pre-Retirement Saving: Evidence from the SSI Program in the U.S. Cambridge, MA: National Bureau of Economic Research, December 1997. http://dx.doi.org/10.3386/w6303.

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7

Sullivan, Daniel T., and Edward J. Colbert. Demonstration of Supervisory Control and Data Acquisition (SCADA) Virtualization Capability in the US Army Research Laboratory (ARL)/Sustaining Base Network Assurance Branch (SBNAB) US Army Cyber Analytics Laboratory (ACAL) SCADA Hardware Testbed. Fort Belvoir, VA: Defense Technical Information Center, April 2015. http://dx.doi.org/10.21236/ada625031.

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8

Moser, Robert, Preet Singh, Lawrence Kahn, Kimberly Kurtis, David González Niño, and Zackery McClelland. Crevice corrosion and environmentally assisted cracking of high-strength duplex stainless steels in simulated concrete pore solutions. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41620.

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This paper presents a study of crevice corrosion and environmentally assisted cracking (EAC) mechanisms in UNS S32205 and S32304 which were cold drawn to tensile strengths of approximately 1300 MPa. The study utilized a combination of electrochemical methods and slow strain rate testing to evaluate EAC susceptibility. UNS S32205 was not susceptible to crevice corrosion in stranded geometries at Cl⁻ concentrations up to 1.0 M in alkaline and carbonated simulated concrete pore solutions. UNS S32304 did exhibit a reduction in corrosion resistance when tested in a stranded geometry. UNS S32205 and S32304 were not susceptible to stress corrosion cracking at Cl⁻ concentrations up to 0.5 M in alkaline and carbonated solutions but were susceptible to hydrogen embrittlement with cathodic overprotection.
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9

Lee, Eleanor S., Christoph Gehbauer, Anothai Thanachareonkit, Luis L. Fernandes, and Taoning Wang. Dual-Zone Solar Control Indoor Shade: Demonstration at the Ronald V. Dellums Federal Building and U.S. Courthouse, 1301 Clay Street, Oakland, California and the Lawrence Berkeley National Laboratory Advanced Windows Testbed, Berkeley, California. Office of Scientific and Technical Information (OSTI), January 2018. http://dx.doi.org/10.2172/1506291.

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Bryant, Duncan, and Leigh Provost. Walter Marine and Atlantic Reefmaker Wave Attenuator : wave transmission testing results. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43303.

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As part of a testing service agreement with Walter Marine and Atlantic Reefmaker, a 1:5.2 physical model of the Reefmaker Wave Attenuator was constructed and tested by the US Army Engineer Research and Development Center to evaluate its influence on wave attenuation. The tested prototype wave periods ranged from 2.5 to 8 sec with prototype wave heights between 1 ft and 6.5 ft. The Reefmaker Wave Attenuator included orthogonal and square designs and was tested under a variety of configurations including a suspended configuration, a bed-mounted configuration, and a rotated configuration. Testing demonstrated that depending on configurations and wavelength, the wave transmission coefficients ranged from 0.29 to 0.70. The most improvement, however, was demonstrated when testing the square unit designs with transmission coefficients, kt, below 0.51. The smallest kt of 0.29 occurred during square unit testing, which consisted of eight bed-mounted, square Ecosystem disks plus a base unit (24.05 in. freeboard) and with a wave period of 3.0 sec and height of 0.84 ft. Of all 134 tests performed, including the suspended case, the average transmission through the structure was 58%.
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