1,721,849 research outputs found
Computing performability measures in Markov chains by means of matrix functions
Full text linkWe discuss the efficient computation of performance, reliability, and availability measures for Markov chains; these metrics — and the ones obtained by combining them, are often called performability measures.
We show that this computational problem can be recasted as the evaluation of a bilinear form induced by appropriate matrix functions, and thus solved by leveraging the fast methods available for this task.
We provide a comprehensive analysis of the theory required to translate the problem from the language of Markov chains to the one of matrix functions. The advantages of this new formulation are discussed, and it is shown that this setting allows to easily study the sensitivities of the measures with respect to the model parameters.
Numerical experiments confirm the effectiveness of our approach; the tests we have run show that we can outperform the solvers available in state of the art commercial packages on a representative set of large scale examples
On the Introduction of the Bologna Process in the Italian Engineering Schools: The Ferrara and Bologna Experience
No full textThe Italian University education system experiences a major change starting from 1999, when a new regulation enforced by law, according to which so that all courses had to be arranged in agreement with one of the objectives of “Bologna process”, namely Adoption of a system founded upon a two-cycle system, that is a 1st and 2nd level. Entrance to 2nd level cycle will require the completion of a 1st cycle of study, of whose duration cannot be less than three years. As a consequence, for all Italian University schools (with some marginal exceptions) a two-level cycle (degree) system was gradually introduced, so that now this scheme is currently adopted in almost all cases. We may noted that a first 3-yaers level degree (called Laurea Triennale – LT – equivalent to a Bachelor degree) is followed by a second level 2-years degree (called Laurea Specialistica – LS – equivalent to a Master degree). After each of the 2 degrees Universities offer the opportunities to attend first and second level specialization courses (called Masters) which are oriented toward a particular kind of professional activity.
In this talk, we will describe the structure of LT and LS, highlighting both the crediting system and the educational goals. We will also compare the structure introduced in the Italian system after 1999 which the situation that was present before, with the aim to highlight pros and cons of the new system. We will do so by referring to the experience maturated at the School of Engineering of the University of Bologna (large size — 12k students) and of the University of Ferrara (small size – less than 2k students). We will finally sketch the change which will be introduced in the next few years t cope with the problem introduced by the 1999 change
Popolazione e memoria della guerra nel Ravennate (1943-1945)
No full textPer circa sei mesi, dall'ottobre 1944 all'aprile 1945, la guerra attraversò le città, i paesi e le campagne del Ravennate. La lunga sosta invernale del fronte lungo il fiume Senio prolungò e inasprì la situazione di emergenza in cui la popolazione era precipitata in seguito all'occupazione tedesca e all'avvicinamento nel territorio delle operazioni belliche. Con l'ausilio di una folta serie di testimonianza orali raccolte in tutti i comuni della provincia di Ravenna, il libro fa luce sul rapporto guerra - popolazione civile e ne fissa i tratti peculiari alla luce delle tracce che di quell'esperienza sono conservate nella memoria di oggi
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
Riflettendo sui contesti. Il contributo dell'archeologia alla conoscenza di S. Lorenzo e delle sue vicende
No full textRiesame critico del contesto di ritrovamento dei sarcofagi presso s. Lorenzo, che si ritiene escludere la giacitura primaria e la pertinenza alla facies romana della città, diversamente da quanto sostenuto in pubblicazioni recent
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
Failures induced on analog integrated circuits by conveyed electromagnetic interferences: A review
No full textFailures induced on analog integrated circuits by electromagnetic interference (EMI) will be analyzed with particular emphasis on integrated operational amplifiers built with different technologies. Additionally, the correlation found between EMI susceptibility and large-signal opamp behavior will be discussed. Some criteria for the design of low EMI susceptibility opamps will be derived. Finally, as an application example, the design of a BiCMOS opamp with an extremely low-probability EMI-induced failure will be presented. Copyright © 1996 Elsevier Science Ltd
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