1,720,956 research outputs found
Simultaneous tracking of multiple drones using convolutional neural networks and optical flow
No full textThe aim of this paper is to implement a multi-object tracker for detecting, discriminating and following multiple drones on the 2D image plane. The main system consists in a neural network trained for detecting drones on the image plane. Once the drones are identified, their Region Of Interest information are sent to the Kalman filter based tracking system in order to compute position estimates. Each detected drone is given an ID using the Global Nearest Neighbor and Auction Algorithms, then the tracking system employs a set of Kalman filters and each measure is assigned to the respective estimate/filter using the unique ID. In order to reduce the effects of the neural network computation (e.g detection) time, every position estimate is corrected using Optical Flow. Results are evaluated through MOT (Multi-Object Tracking) Metrics, aiming to demonstrate the benefits of implementing Optical Flow algorithms for building a robust multi-tracking system
Numerical investigation of a swirled flame model combustor fed with pyrolysis gas
No full textThis paper describes the numerical investigation carried out to analyze turbulent non-premixed syngas-air swirled flames occurring inside an experimental combustion chamber. The aim of this study is to investigate the flame behaviour and the reduction of pollutant emissions for microturbine operation. The CFD analysis, performed with a commercial code, have been carried out to study this combustion process modelled adopting both RANS and LES approaches. In particular, the first part of investigation is focused on the identification of chemical kinetic reaction mechanisms that can better represent the chemistry of syngas-air combustion in the framework of Laminar Flamelet Model. The considered syngas is a pyrolyzed biomass derived gas, composed mainly of CH4, CO, H2 in different proportions. Several kinetic reaction mechanisms capable of modelling the chemistry of methane, high hydrocarbons and hydrogen simultaneously have been examined in the RANS simulations. The second part of this work concerns a deeper investigation with Large Eddy Simulation technique. This numerical approach analyses the flow field more accurately and permits to obtain temperature and emissions distributions more in agreement with experimental results. The paper describes the LES simulation settings, using the Smagorinsky sub-grid scale model and a proper definition of the temporal computational parameters. RANS and LES results, obtained with different kinetic mechanisms, are finally compared with experimental data performed on the combustion test
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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