1,720,958 research outputs found
Amplificazione Raman in cascata: evoluzione del segnale e dell'emissione spontanea amplificata
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Semi-analytical approach to the gain ripple minimization in multiple pump fiber Raman amplifiers
No full textA simplified approach to the search of Raman pump powers and wavelengths minimizing the gain ripple in a Raman multiple-pump amplifier is presented. The first step is to evaluate the pump path average powers and the wavelengths through a minimization algorithm. Then, an approximated analytical derivation of the initial pump powers, that yields an approximated path average power, is given. The results of the algorithm are in excellent agreement with the full numerical calculations
La compensazione della dispersione nella trasmissione in fibra ottica con amplificazione Raman distribuita
No full textDensity-oriented diagnostic data compression strategy for characterization of embedded memories in Automotive Systems-on-Chip
Full text linkEmbedded System-on-Chip (SoC) memory requirements in the Automotive industry are constantly growing. For this reason, memories occupy a significant part of Automotive SoC's die area, increasing the defect probability inside the embedded storage. Automotive SoC manufacturers need to deeply test their embedded memories as they are one of the significant contributors to the yield of their devices.
The test effort increases for the characterization of new technologies and new families of devices that need to be characterized by the manufacturers. These tests generate a massive quantity of diagnostic information that is incredibly valuable for designers and technology experts.
This diagnostic information can be analyzed to identify and correct possible weaknesses and misbehavior. The easiest way to collect memory diagnostic information consists of failure bitmaps in which each fault is saved as coordinates. This method is the simplest solution to implement. However, logging the coordinates of every fault may generate an unmanageable quantity of data. This problem is exacerbated when there is an on-chip limitation on the amount of data that can be saved or transmitted to the external world.
This paper presents an optimized on-chip compression algorithm that allows to reduce the required on-chip memory to store diagnostic information during embedded memory testing. This solution allows the reconstruction of a failure bitmap, generating a topological representation of the density of the failings bits in the embedded on-chip memory. The proposed approach effectively reduces the used storage to a fraction with respect to the one used by the original failing bitmap. The algorithm uses a coordinates-based approach, in which the memory is logically divided into equally divided sectors. The small time overhead introduced by the algorithm is compensated by the ability to achieve optimal space utilization
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
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
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