1,720,991 research outputs found
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
The Algebraic Properties of if-then-else with Commutative Three-Valued Tests
Full text linkThis thesis studies an algebraic model of computable programs and the if-then-else operation. The programs here are considered deterministic, but not assumed to be always halting, so they are modelled by a semigroup of partial functions, with several extra operations in addition to the original binary operation of the semigroup.
The if-then-else operation involves not only programs, but logical tests too. Hence, it calls for a separate algebra of tests. Evaluating a test often requires running another program, so the tests are also possibly non halting. When tests do not always halt, the results of conjunctions (logical ‘and’) and disjunctions (logical ‘or’) can differ, depending on whether sequential or parallel evaluation is applied. The parallel evaluation is what this thesis adopts.
The overall ‘program algebra’ consists of two sorts, one of programs and the other of tests. Each sort has its own operations, and there are hybrid operations such as if-then-else which involve both sorts. This thesis establishes the axioms of all these operations by building an embedding from the abstract program algebra into a concrete one. At the end is a discussion on the algebra of tests without the programs, where the differences between the two evaluation paradigms are explored in detail
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
L-invariants and congruences for Galois representations of dimension 3, 4, and 8
Full text linkThe arithmetic of Galois representations plays a central role in modern number theory. In this thesis we consider representations arising from tensor products of the two-dimensional representations attached to modular forms by Deligne. In particular, we shall study the Iwasawa theory of the adjoint representation, as well as certain double and triple products of Deligne's representations.
In the first half we will undertake a computational study of L-invariants attached to symmetric squares of modular forms. Let ƒ be a primitive modular form of weight and level , and ∤ a prime greater than two for which the attached representation is ordinary. The -adic -function Sym²ƒ always vanishes at s=1, even though the complex -function does not have a zero there. The L-invariant itself appears on the right-hand side of the formula
\frac{\text{\rm d}\;}{\text{\rm d}s}\mathbf{L}_p(\text{\rm Sym}^2f,s)
\Bigg|_{s=k-1}=
\mathcal{L}_p(\text{\rm Sym}^2f) \times
(1-\alpha_p^{-2}p^{k-2})(1-\alpha_p^{-2}p^{k-1}) \times
\frac{L_{\infty}(\text{\rm Sym}^2f,k-1)}{\pi^{k-1}\langle f,f\rangle_N}
where X²-aₚ(ƒ) + p = (-αₚ)(-βₚ) with αₚ ∈ Zˣₚ.
Now let be an elliptic curve over Q with associated modular form ƒᴇ, and ≠ 2 a prime of good ordinary reduction. We devise a method to calculate Lₚ(Sym²ƒᴇ) effectively, then show it is non-trivial for almost all pairs of elliptic curves of conductor ᴇ ≤ 300, with 4|ᴇ, and ordinary primes 2.
In the second half we will establish congruences between -adic -functions. In the late 1990s, Vatsal showed that a congruence modulo ᵛ between two newforms implied a congruence between their respective -adic -functions. We shall prove an analogous statement for both the double product and triple product -adic -functions, Lₚ(f⊗g) and Lₚ (f⊗g⊗h): the former is cyclotomic in its nature, while the latter is over the weight space.
As a corollary, we derive transition formulae relating analytic λ-invariants for pairs of congruent Galois representations for ⊗ , and for ⊗ ⊗ ₕ
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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