1,721,002 research outputs found
Perils of the new labor management guidelines: Should we stop asking "when" to act on delayed progression and start asking "why" the cervical dilatation is slower than the expected labor curve?
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A tool for multimedia quality assessment in NS3: QoE Monitor
No full textNowadays, with the continuous rise of Internet-based multimedia services, such as video sharing websites, web radios and IP-based telephony, multimedia communications are
gaining more and more popularity.
From the service provider’s perspective, there is an increasing need in providing highquality content; at the same time, from the network provider’s view, the requirement is to design networks that can effectively support these services with adequate quality-ofservice (QoS). In both cases, engineers and researchers need suitable planning tools exploitable for providing appropriate designs.
For all these reasons, we have focused our work on the design and implementation of a novel open-source tool, named QoE Monitor, which consists of a new module for the NS-3
simulator that can be used to perform objective and full-reference quality-of-experience (QoE) assessments in any simulated network. The goal of this tool is to predict the video
and/or audio quality perceived by an end user through objective metrics. Moreover, its open-source nature foster its validation and promote knowledge sharing within the research community, while its modularity eases the implementation of additional software components to expand its capabilities (e.g., to account for new codecs and/or new QoE metrics).
In this paper, a detailed description of this tool is done and some numerical results about video streaming performance evaluations are presented, which show its effectiveness for the QoE analysis
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
Security Issues in Emergency Networks
No full textThis paper reviews the most important securityproperties found in computer systems in the context of thenetwork infrastructure for public safety emergency responsesystems. The goal of this research has been to find what propertiesmost affect the design of an emergency response network,together with the study of the set of the available solutions thatcan be used to implement these properties in an actual emergencynetwork
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
QoS Performance Evaluation of Multimedia Services in Emergency Networks
No full textThis work describes the main communication services that have to be provided by any emergency network, together with their bandwidth and network requirements. One of them is voice over IP (VoIP), which is fundamental to coordinate all the necessary rescue operations during a disaster event.However, this service alone is not sufficient for the current needs of any modern (or future) public safety system. Indeed, it has to be accompanied by other important services, like video over IP (VIP) to film the incident area, the transmission of sensor data (e.g., temperature, heartbeat, etc.), and generic file transfer service. In order to design a modern and efficient emergency communication network able to support all of these applications,the first step will be the analysis of the theoretical bandwidth requirements of each network segment. Besides, we will show numerical results, obtained by means of computer simulations,in order to demonstrate that the considered services can be supported, in a reference network architecture, guaranteeing a satisfactory QoS
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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