1,721,013 research outputs found
Logic program specialisation: how to be more specific
Full text linkStandard partial deduction suffers from several drawbacks when
compared to top-down abstract interpretation schemes. Conjunctive
partial deduction, an extension of standard partial deduction,
remedies one of those, namely the lack of side-ways information
passing. But two other problems remain: the lack of
success-propagation as well as the lack of inference of global
success-information. We illustrate these drawbacks and show how they
can be remedied by combining conjunctive partial deduction with an
abstract interpretation technique known as more specific program
construction. We present a simple, as well as a more refined
integration of these methods. Finally we illustrate the practical
relevance of this approach for some advanced applications, like
proving functionality or specialising certain meta-programs written in
the ground representation, where it surpasses the precision of current
abstract interpretation techniques.status: Publishe
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
On the Incremental Evaluation of Higher-Order Attribute Grammars
No full textCompilers, amongst other programs, often work with data that (slowly) changes over time. When the changes between subsequent runs of the compiler are small, one would hope the compiler to incrementally update its results, resulting in much lower running time. However, the manual construction of an incremental compiler is hard and error prone and therefore usually not an option.
Attribute grammars provide an attractive way of constructing compilers, as they are compositional in nature and allow for aspect oriented programming. This thesis describes the automatic generation of incremental attribute grammar evaluators, with the purpose of (semi-)automatically generating an incremental compiler from the regular attribute grammar definition. In particular this approach supports incremental evaluation of higher order attributes, a well known extension to the classical attribute grammars that is used in many ways in compiler construction, for example to model different compiler phases
Informatica : de Kunst van het Abstraheren
No full textHet is ruim 42 jaar geleden dat ik mijn eerste programmeercursus
ALGOL 60 bij het Rekencentrum in Groningen volgde en het is
ruim dertig jaar geleden dat ik door HM aan de Universiteit Utrecht
als hoogleraar Informatica werd benoemd. Sinds die tijd is de wereld
van de Informatica compleet veranderd, maar bij opnieuw bekijken
van oud materiaal is me ook opgevallen hoezeer het begrip abstractie
telkens weer terugkeert
Combinator Parsers: From Toys to Tools
No full textAbstractWe develop, in a stepwise fashion, a set of parser combinators for constructing deterministic, error-correcting parsers. The only restriction on the grammar is that it is not left recursive. Extensive use is made of lazy evaluation, and the parsers constructed “analyze themselves”. Our new combinators may be used for the construction of large parsers to be used in compilers in practical use
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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