1,721,064 research outputs found
Policy-based Access Control for Context-aware Services over the Wireless Internet
No full textThe spreading wireless accessibility to the Internet stimulates the provisioning of mobile commercial services to a wide set of heterogeneous and limited client terminals. This requires novel programming methodologies to support and simplify the development of innovative service classes. In these novel services, results and offered quality levels should depend on both client location and locally available resources (context). In addition, it is crucial to manage the frequent modifications of resource availability
due to wireless client movements during service provisioning. Within this perspective, the chapter motivates the need for novel access control solutions to flexibly control the resource access of mobile clients depending on the currently applicable context. In particular, it discusses and exemplifies how innovative middleware for access control should support the determination of the client context on the basis of high-level declarative directives (profiles and policies) and distributed online monitoring
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
Il metabolismo e la sua regolazione
No full text(Paragrafo iniziale)
Obiettivi
Il capitolo fornirà inizialmente le definizioni di metabolismo e dei suoi sottoinsiemi: catabolismo e anabolismo, inoltre verranno classificate le principali vie metaboliche come appartenenti all’uno o all’altro di questi due sottoinsiemi. Si procederà con una panoramica delle varie modalità che un organismo vivente ha di modulare le attività enzimatiche e conseguentemente di modulare le vie metaboliche che questi enzimi facilitano, in sintesi, sulle varie modalità di regolazione del metabolismo
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
Mobile agents integrity for electronic commerce applications
No full textThe Mobile Agent (MA) paradigm proposes a new approach for designing applications in open and heterogeneous distributed environments. Several application areas can benefit from the adoption of the MA technology, because it can support electronic commerce transactions and help in information gathering, filtering, and negotiation. MA solutions provide mobility, autonomy and easy personalization, but still lack a comprehensive and widely accepted security framework. Only a full answer to the requirement of protection for both execution sites and mobile shopping agents can leverage the adoption of MA solutions in the electronic commerce area. This paper proposes an MA environment to support secure and open electronic commerce applications. In particular, the paper focuses on how mobile shopping agents can be protected from malicious behaviour of execution sites and presents a range of solution strategies. The first solution makes use of a Trusted Third Party entity, while the second one is based on a distributed approach that does not assume the presence of trusted entities. In addition, these two solutions are integrated in a combined one. The paper compares the different approaches and describes their implementation performance
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