1,720,974 research outputs found
Network Management for the 90s
No full textThe increasing complexity and heterogeneity of modern networks has pushed industry and research towards a single and consistent way of managing networks. The effort to define a single industry-standard API for network management basically failed because it did not address aspects like complexity and ease of programming. Recently, a common approach is to map established network management standards into another object model, often based on the emerging Corba standard. Unfortunately even this approach has shown many drawbacks related primarily to the significant amount of code that has to be linked with the final application and to the many limitations and imperfections of the mapping itself. This paper describes a new approach to inter-domain management that attempts to overcome the limitations of current solutions. The goal is to allow people to write hybrid CMIP and SNMP-based network management applications using a single and simple object model. Relevant characteristics of this approach are that it is light, extensible, object-oriented, language-neutral, built upon software-components, string-syntax based and Internet-ready. This demonstrates that it is feasible to implement simple and light applications for inter-domain management without the need for expensive or complex technologies
Network monitoring on multicores with algorithmic skeletons
No full textMonitoring network traffic on 10 Gbit networks requires very efficient
tools capable of exploiting modern multicore computing architectures. Specialized
network cards can accelerate packet capture and thus reduce the processing over-
head, but they can not achieve adequate packet analysis performance. For this rea-
son most monitoring tools cannot cope with high network speeds.
We describe the design and implementation of ffProbe, a network traffic moni-
toring application built on top of FastFlow, combined with several optimized par-
allel programming patterns. We compare ffProbe with two popular network mon-
itoring probes. The results demonstrate that it can scale significantly better with
number of cores and thus may be suitable for monitoring 10 Gbit networks using
commodity servers
Surfin' Network Resources Across the Web
No full textNetwork management standards provide a basis for hiding differences between network resources, along with a method of managing them in a consistent way. Frequently, network management tools are based on proprietary products and are often complex both to use and to install. The increasing popularity of the World Wide Web, with its established user interface and the ability to run on almost any platform, offers a new way to provide wide access to complex software applications. This paper describes the architecture and implementation of two new network management applications that are accessible through the web and are targeted to run on powerful hosts as well as small mobile computers. The GDMO/ASN.1 Search Engine enables users to perform complex queries and to navigate OSI management documents exploiting the web hypertext facilities. Liaison is a web-based browser for CMIP/SNMP agents equipped with powerful tools such as a directory service and a metadata facility
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
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
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