1,721,039 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
An Approach for the Creation of Collaborative Environments
No full textIn this paper, we propose an approach for the creation of collaborative e-learning environments. The approach provides suitable visual languages allowing the instruction designer to specify e-learning courses in a simple way. The defined courses are based on synchronous and asynchronous activities. Moreover, we describe a system prototype based on the presented approach, which provides automated support for the generation of e-learning courses starting from their visual specification. Another distinctive characteristic of our approach is the possibility to specify and generate full collaborative environments. This learning paradigm let us augment the effectiveness of the e-learning courses allowing learners to share experiences and knowledge
An Integrated System for Designing, Implementing and Managing Adaptive E-learning Activities
No full textAppropriate 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
Visual Modelling of Role-Based Security Policies in Distributed Multimedia Applications
No full textThe management of distributed multimedia systems is simplified when it is based on policies. The latter should be platform independent and expressed in terms of roles. Usually, they are defined through languages that conceptualize the hardware characteristics providing powerful abstraction on the technical components of a system. Unluckily, these languages are very difficult to use for nonexpert users. To support all the different types of users visual languages have been proposed. Following this paradigm, we propose a visual language hierarchy and a tool for specifying and implementing access and security policies according to the RBAC model
Visual Languages for Defining Adaptive and Collaborative e-Learning Activities
No full textIn order to support instructional designers in the creation of distance courses, involving learning contents, collaborative activities, and assessment tests, a suite of visual languages are proposed. In particular, we define an extension of UML Activity Diagrams, named eXtended Learning Activity Diagram, to make them suitable for defining e-learning courses based on e-learning activities. We also propose the Adaptive Self consistent Learning Object SET language for defining learning contents, the SYnchronous Collaborative Learning Environment used to define synchronous and asynchronous learning environments, and the Test Maker Language for defining assessment and self-assessment tests. The proposed visual languages have been implemented in the SEAMAN tool (System for E-learning Activity MANagement) which provides means to fully design, implement, and deploy adaptive e-learning courses
A Visual Language for Designing and Presenting e-learning Activities
No full textWe propose a visual language based approach to support an instruction designer in the creation of e-learning activities, distance courses and assessment tests. In particular, we have extended UML activity diagrams to make them suitable for the definition and generation of e-learning activities. The language is turned out to be also a powerful tool for presenting e-learning activities to end-users by providing them an easy user interface which allows us also to keep track of students' progresses. We also present a system prototype based on the proposed approach. The system includes integrated modules for several authoring activities, such as distance courses, assessment and self-assessment
A Visual System for Designing and Realizing Adaptive Distance Courses
No full textWe propose a visual language based approach to support the instructional during the definition, designing and organization of distance courses. Three visual languages are presented, which allow us to model a set of didactic contents by taking into account the learner knowledge. A system prototype supporting the proposed approach is also described. It assists instructional designer in the definition of adaptive learning processes and automatically generates the designed distance courses
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