1,721,199 research outputs found
ART-GCS: An Adaptive Real-Time Multi-Agent Ground Control Station
Get PDF©2019 IEEE
Spring Simulation Conference (SpringSim) (2019. Tucson, Arizona)
This work is supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through the funding of DPI2013-46665-C2-1-R project.Ground Control Stations (GCS) are essential tools to monitor and command real-world complex missions involving Unmanned Vehicles (UVs). As the number and types of UVs in the mission grows, implementing a robust and adaptable GCS, capable of simplifying and reducing operator' interactions and mental workloads, becomes an engineering challenge. To address it, this paper presents a new Adaptive-Real-Time (ART)-GCS that 1) allows to monitor and control a runtime changing number of heterogeneous UVs, 2) adapt its GUI to the mission requirements and operators workload to minimize their fatigue and stress, and 3) provide support to experiments with actual and simulated UVs. To show its benefits in real-world missions, this paper presents a field experiment where, for safety reasons, a simulated unmanned aerial vehicle has to find an oil-spill that must be enclosed by a containment boom dragged by two real unmanned surface vehicles.Ministerio de Economía y Competitividad (MINECO)Sección Deptal. de Arquitectura de Computadores y Automática (Físicas)Fac. de Ciencias FísicasTRUEpu
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Control de formaciones de vehículos marinos de superficie con restricciones de entrada
Get PDF[Resumen] Se presenta un algoritmo para el control de formaciones y seguimiento de caminos para vehículos no holónomos con aplicación a vehículos marinos de superficie. El algoritmo sigue una estructura líder-seguidor y es una extensión de un artículo anterior [1] a curvas parametrizadas, y no sólo para caminos formados por tramos rectos y circulares. Además, se tiene en cuenta las restricciones que restringen las posibles trayectorias que pueden ser seguidos por el líder. El algoritmo sigue manteniendo la ventaja de la sencillez y sólo necesita de la sintonía de un parámetro para cada uno de los vehículos. Se muestran experimentos simulados con modelos reales a escala que validan el método propuesto.Este trabajo ha sidofinanciado por los proyectos DPI2013-46665-C2-R1 y DPI2013-46665-C2-R2https://doi.org/10.17979/spudc.978849749808
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
A streamlined nonlinear path following kinematic controller
Get PDFISSN: 1050-4729
© IEEE Computer SOC 2015.
IEEE International Conference on Robotics and Automation (ICRA) (2015. Seattle, EEUU).
This work was supported by the Spanish Ministry under project DPI2013-46665-C2.This paper presents a new nonlinear path-following guidance method for autonomous vehicles, which integrates two guidance laws that have given good results independently in applications in autonomous ground, marine, and air vehicles. This new technique retains the best aspects of its two supporting methods, whereas it overcomes some of their drawbacks. It uses the control law by Park et al. to command the vehicle position towards a reference point. However, the position of the reference point is controlled in a different way: instead of being calculated to stay at a fixed distance forward of the vehicle, we use a strategy, inspired in the works by other authors, that controls the speed of the reference point to maintain its position at the given distance. This change does not increment the number of parameters to tune the algorithm and makes it applicable to any initial conditions and parameterized paths. The paper also analyzes the stability of this new nonlinear guidance control law and shows its effectiveness under different simulations.Ministerio de Economía y CompetitividadSección Deptal. de Arquitectura de Computadores y Automática (Físicas)Fac. de Ciencias FísicasTRUEpu
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Modelo dinámico para el despliegue automático de una barrera de contención de vertidos marinos
Get PDF[Resumen] El presente trabajo presenta un modelo dinámico para el estudio del movimiento de una barrera de contención de vertidos marinos, cuando es remolcada por un par de barcos. Se describen los fundamentos seguidos en el modelado de la barrera, así como en el de los barcos remolcadores. A continuación, se presentan algunos escenarios básicos de remolque de las barreras, así como las implicaciones para el control del movimiento coordinado de los barcos que la remolcan. Por último, se presentan algunas conclusiones y posibles líneas de trabajo futuras.Los autores agradecen la financiación recibida de los proyectos: DPI2013-46665-C02-1-R y DPI2013-46665-C02-2-R: “Sistema Autónomo para la Localización y Actuación ante Contaminantes en el Mar", de la que es parte el presente trabajohttps://doi.org/10.17979/spudc.978849749808
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