1,721,008 research outputs found
Wireless LANs: an adaptive algorithm to reduce power consumption
No full textA novel radio modem architecture is proposed for a single-hop ad hoc networks (WLAN) providing wireless access to Internet. The system works at 17 GHz, employs OFDM modulation and provides very high bit rate (up to 160 Mbit/s at physical layer) using TDMA access scheme. Network control is centralized and handled by a device (master), which is run-time selected among all the active devices (slaves). The main focus of the paper is to address the power consumption issue, which is a crucial requirement for portable devices. In particular, the paper described the developed MAC procedures and algorithms concerning the interface with physical layer. Simulation trials show that a considerable power saving can be attained without decreasing system performance
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
Conclusioni
No full textTensioni generate nella storia dei simboli politici dal riferimento alla figura della regalità in Crist
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
Genetic characterization of Vitis vinifera accessions cultivated in Sicily (Italy)
No full textGrape production and wine production are expanding sectors of Sicilian agriculture. Sicilian wines have asserted themselves on the Italian and on the international market over the last years. Sicily provides a high number of autochthonous Vitis vinifera varieties that are an important source of genetic diversity that is at the moment unexploited. Indeed, selected material from local cultivars is missing. The goal of this project is a better agronomic, sanitary, and genetic evaluation of cultivated germplasm. The information gathered will form the basis of a tool to assess intra-varietal diversification and assist clonal selection and registration. The present study reports preliminary results obtained in the analysis of 17 major Sicilian varieties with 12 microsatellite markers (VVS2, VVMD7, VVMD27, VVMD21, VVMD24, VVMD25, VVMD28, VrZAG21, VrZAG47, VrZAG62, VrZAG79). The microsatellite allelic profiles allowed the identification and discrimination of all tested cultivars
Trent'anni di vita della Provincia di Genvoa (1951-1981)
No full textIl volume descrive l'evoluzione socio economica, finaniaria e giuridico istituzionale della Provinca di Genov
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