1,721,079 research outputs found
A new data concentrator for the CMS muon barrel track finder
No full textThe CMS muon trigger will undergo considerable enhancements in preparation for the LHC run-2. In order to improve rate reduction and efficiency the full muon trigger chain will be completely redesigned: the plan is to move from a redundant scheme, where the three sub-detectors (CSC, DT, RPC) have a separate track finder, to three geographical track finders (barrel, endcap and overlap) that combine trigger primitives of each sub-detector. In particular, the Muon Barrel Track Finder (MBTF) will host a new algorithm, that aggregating DT and RPC trigger data, will be able to improve the fake rejection and the muon momentum measurement. This report will focus on the adaptive layer of the MBTF called Twin Mux. Its primary role will be to merge, arrange and fan-out the slow optical links from the chambers in faster links (10 Gbps). It will realize a full connectivity matrix between the on-detector electronics and the MBTF allowing for different processing schemes. The Twin Mux will be implemented in μTCA form factor compliant with all the CMS standards in terms of clock distribution, slow control and data acquisition. The Twin Mux will be centered around a powerful Virtex-7 FPGA able to exchange data on up to 96 optical lanes. The gigabit connectivity on the backplane will guarantee the connection with the central DAQ, allowing the adoption of the Twin Mux as a read out board for DT as well
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
PCI express over optical links for data acquisition and control
No full textPCI Express is a new I/O technology for desktop, mobile, server and communications platforms designed to allow increasing levels of computer system performance. The serial nature of its links and the packet based protocols allows an easy geographical decoupling of a peripheral device. We have investigated the possibility of using an optical physical layer for the PCI Express, and we have built a bus adapter which can bridge remote busses (> 100m) to a single host computer without even the need of a specialized driver, given the legacy PCI compatibility of the PCI Express hardware. This adapter has been made tolerant to harsh environmental conditions, like strong magnetic fields or radiation fluxes, as the data acquisition needs of high energy physics experiments often require
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
A PCI express optical link based on low-cost transceivers qualified for radiation hardness
No full textIn this paper we want to demonstrate that an optical physical medium is compatible with the second generation of PCI Express. The benefit introduced by the optical decoupling of a PCI Express endpoint is twofold: it allows for a geographical detachment of the device and it remains compliant with the usual PCI accesses to the legacy I/O and memory spaces. We propose two boards that can bridge the PCI Express protocol over optical fiber. The first is a simple optical translator while the second is a more robust switch developed for connecting up to four devices to a single host. Such adapters are already working in the control and data acquisition system of a particle detector at CERN and hence they had been qualified for radiation hardness. The positive outcomes of the radiation tests of four types of off-the-shelf transceivers are finally reported. © 2013 IOP Publishing Ltd and Sissa Medialab srl
Remoting field bus control by means of a PCI Express-based optical serial link
No full textA major evolution moved into the I/O architecture of modern computers, where the multi-drop buses have been replaced by a network of point-to-point links. Besides the increased throughput and the inherent parallelization of the data flows, the serial nature of those links and the packet-based protocols allow an easy geographical decoupling of a peripheral device. In the context of the LINCO project, we investigated the possibility of using an optical physical layer for the PCI Express, and we built a bus adapter which can bridge, through such a link, remote buses (>100 m) to a single-host computer without even the need of a specialized driver, given the legacy PCI compatibility of the PCI Express hardware. By the choice of suitable components and dedicated control logic, the adapter has been made tolerant to harsh environmental conditions, like strong magnetic fields or radiation fluxes, that the data acquisition needs of high-energy physics experiments often require. © 2006 Elsevier B.V. All rights reserved
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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