83,399 research outputs found
5G Aerial Component for IoT Support in Remote Rural Areas
No full textThere is today a renewed interest in satellite communications. It is expected that many new systems will be operative in a short time. They will become part of the aerial component of 5G, also including high-altitude balloons and drones for focused coverages. The interest of this paper is to investigate a satellite 5G scenario for massive Machine Type communication (mMTC), where an intermediate layer of drones is used for collecting sensors data. We study an application where sensors are deployed in large rural (remote) areas for the timely detection of fire alarms (even if other types of measurements and alarms are possible). In this scenario, no terrestrial Internet connectivity is available so that drones are used to collect data from sensors and connect to a control station via satellite. A system architecture has been proposed and an analytical model has been adopted to characterize the mean delay to notify alarms from the field to the control center. This model takes shadowing and collisions effects into account. This study has been validated by means of simulations
Letter from E. O. Patterson to Secretary of the Interior
No full textLetter from E. O. Patterson to Secretary of the Interior on automobile fees in the park
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
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
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
Democracia, comunicação e negócio : o crescimento desmesurado da concentração económica
Get PDFNeste artigo passa-se em revista a evolução da concentração das indústrias culturais e comunicativas que, ao longo do tempo, foram adquirindo um maior protagonismo na vida política, cultural e económica das sociedades, especialmente das mais desenvolvidas. A interrelação que se deu entre os regimes democráticos e os meios de comunicação, sobretudo desde o século XIX nos países liberais (embora com uma democracia mais restringida do que a actual), entrou em crise. Em traços largos, a crescente mercantilização da actividade cultural, comunicativa e de entretenimento coloca a questão de saber se os actuais macro ou mega grupos comunicativos e multimédia não têm um protagonismo excessivo, que de alguma maneira conviria controlar por parte dos Estados democráticos. Embora com uma visão geral, procurou-se utilizar exemplos do caso espanhol.In the present article, the author reviews the evolution of cultural and communication industries’ concentration. Such industries have reinforced their protagonism in the political, cultural and economic life of societies, particularly the most developed. The connection between democratic regimes and the media, established mainly since the 19th century in liberal countries (boasting, nevertheless, a more restricted democracy than current trends), is in crisis. Generally speaking, the growing commercialization of cultural, communicative and entertaining activities confront us, in actuality, with the issue of a possibly excessive protagonism on the part of macro or mega communicative and multimedia corporations which should somehow be controlled by democratic States. Although from a generalist perspective, the author draws on multiple examples from the Spanish situation as cases-in-point
Mining e-mail content for author identification forensics
No full textWe describe an investigation into e-mail content mining for author identification, or authorship attribution, for the purpose of forensic investigation. We focus our discussion on the ability to discriminate between authors for the case of both aggregated e-mail topics as well as across different email topics. An extended set of e-mail document features including structural characteristics and linguistic patterns were derived and, together with a Support Vector Machine learning algorithm, were used for mining the e-mail content. Experiments using a number of e-mail documents generated by different authors on a set of topics gave promising results for both aggregated and multi-topic author categorisation
A caminho do controlo de autoridade universal: o Projecto AUTHOR
No full textDescreve-se o Projecto "AUTHOR" como a primeira tentativa concretizada tendo em vista a partilha internacional de registos de autoridade em formato UNIMARC, resultados obtidos e perspectivas de evolução para a troca de dados de autoridade no contexto internacional
A negação e o reencontro do objecto pulsional
No full textAfreudite : Revista Lusófona de Psicanálise Pura e AplicadaO autor relê o artigo de Freud «A Negação» a partir do ensino de Jacques Lacan, que no seu retorno à Freud situa e distingue o que da linguagem se destaca como critérios da abordagem estrutural.The author repeats the article by Freud «Negation» from the teaching of Jacques Lacan, who in his return to Freud located and what distinguishes the language will stand out as criteria of the structural approach
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