1,721,111 research outputs found
Tra le isole di Darwin
No full textL'interesse naturalistico dell'arcipelago delle Galápagos e della sua fauna è determinato dalla coincidenza di alcune circostanze, tra le quali la posizione geografica e l'origine geologica. Tutte le isole dell'arcipelago hanno, infatti, origine vulcanica, ossia derivano da eruzioni avvenute sul fondo marino (in una zona molto attiva da questo punto di vista), che hanno provocato l'emersione di una parte più o meno estesa del relativo cono vulcanico.
Questa nascita, comune anche ad altri arcipelaghi oceanici, ha fatto sì che al momento della loro emersione le isole fossero ambienti virtualmente sterili, completamente privi di vita, e che il loro popolamento faunistico e floristico sia potuto avvenire soltanto attraverso la colonizzazione di specie provenienti dai continenti vicini. Qui entra in gioco la posizione geografica: le isole si trovano a circa 1000 chilometri dalle coste del Sud America, e ciò ha reso la loro colonizzazione un'impresa assai ardua per molte specie poco adatte a percorrere grandi distanze, o a sopportare, se trasportate passivamente, un viaggio così lungo
ESperienze nella Pubblica amministrazionE, Ricerca, Tecnologie, Applicazioni (ESPERTA) : workshop ospitato all'interno della seconda Conferenza internazionale sui Sistemi Open Source (OSS) : Como, Italia, 8 giugno 2006
No full textCoPrA : a tool for coding and measuring communication in teams
No full textThe analysis and assessment of team processes to inform facilitation for increased team effectiveness is a challenging task for organizations. Also, research has troubles to grasp the complexity of team effectiveness, which often results in treating team processes as a black box. This paper introduces a design artifact that is built upon the collaboration process analysis technique CoPrA. The technique strives to support the analysis of team processes by identifying behavior patterns, which crystalize as behavior patterns in the dynamic process of a team. The paper aims to contribute to behavioral research as it showcases a set of process metrics for the analysis of team communication. Furthermore, the paper aims to contribute to design-science research by providing an integrated tool for content analysis and process mining used primarily by researchers
Open source in Web-based applications : a case study on single sign-on
No full textBusiness and recreational activities on the global communication infrastructure are increasingly based on the use of remote resources and services, and on the interaction between different, remotely located parties. In such a context, Single Sign-On technologies simplify the log-on process allowing automatic access to secondary domains through a unique log-on operation to the primary domain. In this paper, we evaluate different Single Sign-On implementations focusing on the central role of Open Source in the development of Web-based systems. We outline requirements for Single Sign-On systems and evaluate four
existing Open Source implementations in terms of degree of fulfilment of those requirements. Finally we compare those Open Source systems with respect to some specific Open Source community patterns
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
Towards Conceptual Models for Machine Learning Computations
No full textWe make the case for conceptual models that give the human designer full visibility and control over key aspects of ML applications, including input data preparation, training and inference of the ML models. Our models aim to: (i) achieve better documentation of ML analytics (ii) provide a foundation for a chain of trust in the ML analytics outcome (iii) provide a lever to enforce ethical and legal constraints within the ML pipeline. Representational models can dramatically increase reusability of large-scale ML analytics, while decreasing their roll-out time and cost. Also, they will support novel solutions to time-honored issues of analytics like non-uniform data veracity, privacy and latency profiles
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
FOCSE : an OWA-based evaluation framework for OS adoption in critical environments
No full textWhile the vast majority of European and US companies increasingly use open source software for non-key applications, a much smaller number of companies have deployed it in critical areas such as security and access control. This is partly due to residual difficulties in performing and documenting the selection process of open source solutions. In this paper we describe the FOCSE metrics framework, supporting a specific selection process for security-related open source code. FOCSE is based on a set of general purpose metrics suitable for evaluating open source frameworks in general; however, it includes some specific metrics expressing security solutions’ capability of responding to continuous change in threats. We show FOCSE at work in two use cases about selecting two different types of security-related open source solutions, i.e. Single Sign-On and Secure Shell applications
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