1,721,001 research outputs found
Automatic instantiation of abstract tests to specific configurations for large critical control systems
No full textComputer-based control systems have grown in size, complexity, distribution and criticality. In this paper
a methodology is presented to perform an ‘abstract testing’ of such large control systems in an efficient
way: an abstract test is specified directly from system functional requirements and has to be instantiated
in more test runs to cover a specific configuration, comprising any number of control entities (sensors,
actuators and logic processes). Such a process is usually performed by hand for each installation of
the control system, requiring a considerable time effort and being an error-prone verification activity.
To automate a safe passage from abstract tests, related to the so-called generic software application, to
any specific installation, an algorithm is provided, starting from a reference architecture and a statebased
behavioural model of the control software. The presented approach has been applied to a railway
interlocking system, demonstrating its feasibility and effectiveness in several years of testing experience
Modelli per l'analisi di sistemi critici
No full textL’impiego di elaboratori in contesti diversi e sempre più delicati richiede di prestare particolare attenzione alle problematiche di sicurezza e affidabilità. In questo articolo, dopo una breve introduzione ai concetti base della dependability dei sistemi di elaborazione, verrà presentata una panoramica
sulle tecniche modellistiche più diffuse per l’analisi di sistemi critici. Basandosi su vantaggi e limitazioni dei diversi approcci descritti, sarà introdotto il tema della modellazione multi-formalismo, riferendosi ad alcune delle prospettive di ricerca più interessanti in tale ambito
Information Fusion e sorveglianza
No full textUno degli ambiti maggiormente interessati dall???aumento del rapporto tra numero di elaboratori e numero di utenti è quello dei sistemi di monitoraggio distribuito per applicazioni di supervisione, diagnostica e sorveglianza. In tali sistemi, infatti, pochi operatori sono chiamati a
controllare un elevato numero di sensori e sottosistemi, spesso distribuiti ed eterogenei. In questo articolo verranno illustrate tecniche automatiche di integrazione ed interpretazione dei dati per consentire di gestire una mole potenzialmente elevata di informazioni ed adottare decisioni efficaci in tempi rapidi
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
On-line integration and reasoning of multi-sensor data to enhance infrastructure surveillance
No full textVariations 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
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