1,720,965 research outputs found
System-Level Tools for NoC-Based Multi-Core Design
No full textThe need to assist the NoC-based Multi-Core Design via System-level open Tools is demonstrated by the amount of research in the design space exploration of networks on chip (NoC) and in the need for preliminary performance evaluation of metrics, application mapping and scalability issues. This chapter provides a detailed analysis of innovative research solutions for characterization of Synthetic Traffic Models, Graph Theoretical Analysis, methodologies for Task Mapping for System on Chip (SoC) Applications, illustration of the potential of the OMNeT++ Simulation Framework and a case study illustration of all those solutions integrated for the study of the STM Spidergon NoC architecture
aEqualized: A novel routing algorithm for the Spidergon Network On Chip
No full textWe present the aEqualized routing algorithm: a novel algorithm for the Spidergon Network on Chip. AEqualized combines the well known aFirst and aLast algorithms proposed in literature obtaining an optimized use of the channels of the network. This optimization allows to reduce the number of channels actually implemented on the chip while maintaining similar performances achieved by the two basic algorithms. In the second part of this paper, we propose a variation on the Spidergon's router architecture that enhances the performance of the network especially when the aEqualized routing algorithm is adopted
The Connection-Then-Credit Flow Control Protocol for Heterogeneous Multicore Systems-on-Chip
No full textConnection-then-credits (CTC) is a novel end-to-end
flow control protocol to handle message-dependent deadlocks
in best-effort networks-on-chip (NoC) for embedded multicore
systems-on-chip (SoCs). CTC is based on the classic end-to-end
credit-based flow control protocol but differs from it because it
uses a network interface microarchitecture where a single credit
counter and a single input data queue are shared among all possible
communications. This architectural simplification reduces
the area occupation of the network interfaces and increases their
design reuse; for instance, the same network interface can be used
to connect a core independently of the number of incoming and
outgoing communications. CTC, however, requires a handshake
preamble to initialize the credit counter in the sender network
interface based on the buffering capacity of the receiver network
interface. While this necessarily introduces a latency overhead in
the transfer of a message, simulation-based experimental results
show that the penalty in performance is limited when large
messages need to be transferred, thus, making CTC a valid
solution for particular classes of applications such as video stream
processing
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
CTC: An end-to-end flow control protocol for multi-core systems-on-chip
No full textWe propose Connection then Credits (CTC) as a new end-to-end flow control protocol to handle message-dependent deadlocks in networks-on-chip (NoC) for multicore systems-on-chip. CTC is based on the classic end-to-end credit-based flow control protocol but differs from it because it uses a network interface micro-architecture where a single credit counter and a single input data queue are shared among all possible communications. This architectural simplification reduces the area occupation of the network interfaces and increases their design reuse: for instance, the same network interface can be used to connect a core independently of the number of incoming and outgoing communications. CTC, however, requires a handshake preamble to initialize the credit counter in the sender network interface based on the buffering capacity of the receiver network interface. While this necessarily introduces a latency overhead in the transfer of a message, simulationbased experimental results show that the penalty in performance is limited when large messages need to be transferred, thus making CTC a valid solution for particular classes of applications such as video stream processing
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