1,720,955 research outputs found
An asynchronous scheduler to minimize energy consumption in wireless sensor networks
No full textEnergy efficiency is one of the main issues in the design and optimization of Wireless Sensor Networks (WSN) since each node is typically subject to a hard battery limitation.
Taking into account that the most energy-consuming component of a WSN node is the radio, the design of energyefficient routing and MAC protocols is certainly a valid approach to face the problem. Minimizing the energy consumption allows to increase the lifetime of nodes and so of the overall network. This paper deals with a novel low power Medium Access Control (MAC) protocol compliant with the ZigBee standard. In particular, a new algorithm to tune the duty cycle of a node, i.e., the cycling between an awake and a
sleep state of the radio transceiver, is proposed. The basic idea of this solution is that neighboring nodes exchange information about their transmission time, so that each one knows in advance when it is supposed to be awake to receive a message and when it can switch off its radio. Low requirements in terms of processing and storage capacity characterize this solution. Furthermore, it is able to react effectively both to network topology changes and to clock desynchronization. The effectiveness of the defined schema has been evaluated, in terms of delay and power consumption, by means of simulations. The simulation results have highlighted
substantial improvements of the proposed solution
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
An Optimal Setting for the Parameters of an Intelligent Flooding Scheme in VANETs
No full textA number of Intelligent Flooding Schemes have been recently
proposed in order to optimize message dissemination
in Vehicular Ad Hoc Networks. In this paper we focus on a
scheme which exploits a distributed timer-based contention
mechanism for allowing only contention winners to forward
the message and to suppress other potential forwarders. In
particular, at each hop along the message propagation direction,
potential forwarders wait for a time which is inversely
proportional to their distance from the sender before
rebroadcasting the packet; a potential forwarder is suppressed
if it intercepts the packet rebroadcasted by another
node during the waiting time. Performance of the scheme, in
terms of message delivery ratio, delay and channel utilization,
depends on the maximum waiting time (MaxWT) and
on the maximum distance R allowed between the sender and
a potential forwarder. This research work aims at evaluating
an optimal setting of these parameters. We show that, although
the values of MaxWT and R which maximize performance
vary with traffic load and vehicle density, a dynamic
algorithm is not essential. Then, we report how to set
the values of the parameters to achieve a performance that
is acceptable in the scenarios which we have considered
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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