1,721,112 research outputs found
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
'Energy efficient ethernet' enhanced with a QoS-aware sleep mode controller
No full textOperating costs and scalability of nowadays telecommunication networks are largely impacted by energy consumption of network equipments. In packet switching devices it is especially due to packet processing, queuing, and input/output interface functionalities. Different approaches to reduce energy consumption in packet switches are emerging, some exploit under-laid optical bypass of transit traffic to reduce their capacity and interfaces, others simplify their operations or turn off some of their functionalities when unnecessary. The IEEE standardization body developed a standard on Energy Efficient Ethernet (IEEE P802.3az) that defined a mechanism allowing to de-activate the Physical layer elements during periods of low link utilization. It is based on a protocol that coordinates transitions to and from a lower power consumption mode without changing the link status and dropping frames. Time needed by such transitions is, however, comparable with packet transmission time; that makes energy efficiency of the method far from being proportional to interfaces unused capacity. Solutions proposed in the literature to improve EEE performance are mainly based on the buffer and burst approach, which, making the transmission non continuous, creates more opportunities for long sleeping period. Such solutions, however, if applied across the network, strongly impact packet delay requirements. In this paper, a traffic management mechanism that controls sleeping period to reduce EEE transitions overhead while meeting delay constraints of data flows is proposed. Starting from the consideration that in Ethernet network provisioning is static, i.e. service level agreement parameters of each flow are configured on switches output ports of its path via management plane at the set-up phase, the proposed method off-line determines, for each output port, if the activation of a dummy flow, associated to the quiet period, can provide power consumption reduction without impacting data flows delay requirements. On ports where the dummy flow is activated the sleeping period is triggered by the scheduler mechanism each time a dummy packet is served. A comparative analysis between the standard EEE, with and without the support of buffer and burst functionality, and the proposed method has been carried out in order to quantify the improvements in terms of energy efficiency and to assess its effectiveness in terms of Quality of Service (QoS). © 2011/2012 IOS Press and the authors
Intracellular glutathione content in feline oocytes matured in vitro in the presence of L-cysteine
No full textCHANGES IN COGNITIVE ASYMMETRIES FROM WAKING TO REM AND NREM SLEEP
No full textIn previous studies, a right hemisphere superiority was shown during REM sleep with respect to Wake and NREM states for right hemisphere tasks. The question can be raised whether the increasing right hemisphere performance during REM is related to right hemisphere tasks only, or whether it is of more general nature. This hypothesis was tested by giving the lateralized Consonant Recognition Task to 16 subjects during waking and upon awakenings from REM and NREM sleep. Results support the hypothesis that right hemisphere superiority in REM sleep is not restricted to right hemisphere tasks. (C) 1995 Academic Press, Inc
Modello di previsione dell’ attenuazione acustica di barriera singola o doppia per sedi ferroviarie di metropolitane urbane
No full textActigraphic motor asymmetries during sleep
No full textMuch evidence indicates that during sleep there is a repatterning of motor asymmetries with a relative advantage of the left hand (ie, the left hand moves more than the right). This could be due to the ability of the right hemisphere in operating at levels of reduced arousal (arousal hypothesis) or to its superior spatial abilities (motor specificity hypothesis), or it could indicate a greater need for sleep in the left hemisphere (homeostatic hypothesis). Since only the latter hypothesis predicts that the repatterning should be present in the first part of sleep (ie, when the homeostatic processes are more pronounced), the present study evaluated whether actigraphic data are consistent with this prediction. Sixteen right-handed college students wore actigraphs (AMI 16K) on both upper and lower limbs for about 56 hours. Factorial ANOVAs were carried out on side (left vs right) and part (first vs second) of the recording period during sleep and waking. During waking, the right hand showed more intense motor activity as compared to the left. During sleep, in the first part of the night, the right hand lost this advantage, while in the second part of the night it regained its superiority. Since this repatterning was specific for hand movements and no difference was found in overall motor activity and in arousal between the two parts of the sleep period, the results are interpreted as consistent with the homeostatic hypothesis
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
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