1,721,128 research outputs found
Hiding communication latencies in message-passing multiprocessors: a case study based on neural network simulation
No full text{An application package which allows the user to explore the possibility of hiding communication latencies in message-passing multiprocessors is examined. The package is a neural network simulator for transputer-based machines. Simply by modifying few high-level directives in a configuration file, heuristic strategies for fully overlapping communication delays with internal computation, can be easily explored. The neural network model and the software architecture are described. An example is discussed.>
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
Supporting load distribution strategies in message-passing multiprocessors: a case study
No full text{An abstract is not available.
Group-Based Fault-Tolerance in Partitionable Asynchronous Distributed Systems
No full textWe consider the problem of developing reliable services to be deployed in partitionable asynchronous distributed systems. What makes this task difficult is guaranteeing the consistency of shared state despite failures and recoveries. While process groups and view-synchronous communication can significantly simplify reasoning about failures in such systems, they are insufficient for dealing with recoveries and merging of partitions after repairs. We define shared state reconciliation as the abstract characterization of recovery and show how view-synchronous communication can be enriched in order to solve it simply and systematically
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
The mechanism of inhibition of semicarbazide-sensitive amine oxidase by 3,5-diethoxy-4-aminomethylpyridine (B24)
No full textMechanisms for application-level recoverable-persistence in a single address space
No full textIn this paper we consider mechanisms for supporting recoverable-persistence in a single address space memory model. In particular, we consider a memory management system, MMS, for a persistent single address space and show how the operations MMS supplies can be exploited by applications to make their state recoverable-persistent. To this end, we present detailed examples of application-level management of recoverable-persistence. The resulting scenario appears to be particularly attractive because of its modularity. Moreover, additional complexity is not introduced at the lower layers of the system and applications that do not need recoverable-persistence need not be penalised
On programming with view synchrony
No full text{View synchrony has been proposed as a programming paradigm for developing reliable distributed applications. The paradigm is particularly attractive when the underlying computing system is asynchronous and prone to complex failure scenarios including partitions. View synchrony encourages a programming style where groups of processes cooperate closely in order to maintain some form of shared state among them. In this paper we examine the technical problems that arise in shared state management when programming applications using view synchrony. We identify three classes of problems corresponding to state transfer upon group joins, state recreation after total failures and state merging after partition unions. We argue that shared state problems are inherent to any implementation, and without explicit support, attempts to solve them may easily obscure much of the simplicity and elegance of view synchrony. Finally, we propose an extension to the traditional view synchrony model based on the notion of subviews that addresses the problems raised by shared state management
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