1,721,001 research outputs found
Dynamic Programming for Energy State Control of Machine Tools in Manufacturing with Part Admission Control
No full textEnergy efficiency in manufacturing is becoming a challenging goal due to the demand of this sector in the world-
wide scenario. In the last years there has been a growing interest on technical solutions to reduce the energy
consumption in manufacturing and one of the measures for saving energy is the implementation of controls that
reduce machine energy consumption. Thus, controlling the machine state towards the optimum trade-off between
cycle time and power demand can improve machine sustainability in manufacturing. Further, the integration of
machine state control with part admission allows the representation of limited capacity systems
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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Aspects of optimization with increasing concave stochastic order constraints
Get PDFThis dissertation applies convex optimization techniques to a class of stochastic optimization problems. This class of problems is distinguished by a multivariate increasing concave stochastic order constraint on a random-variable-valued mapping. The analysis is divided into four chapters to address four different aspects of optimization with increasing concave stochastic order constraints.In Chapter 3, we describe this class of stochastic optimization problems in detail. This class of problems does not satisfy the Slater condition, and we must overcome this technical difficulty to apply convex optimization. We introduce a perturbation of the original problem for this purpose and we discuss semi-infinite programming and nonlinear programming relaxations of this perturbation. It is shown that increasing concave functions act as the Lagrange multipliers of increasing concave stochastic order constraints. We conclude this chapter with a discussion about a transformation of these problems via coupling on finite probability spaces.In Chapter 4, we consider sample average approximation for increasing concave stochastic order constrained programs. We verify consistency of sample average approximation. We also study sample average approximation for the semi-infinite programming and nonlinear programming relaxations presented in Chapter 3. Again, we verify consistency of sample average approximation for these relaxations. The solution method in this chapter is based on the coupling transformation from Chapter 3. This transformation necessarily requires a large-scale implementation. We comment on aggregation, column generation, and row generation techniques as a possible large-scale approach.In Chapter 5 we introduce a robust version of the increasing concave stochastic order. Specifically, we consider model misspecification for the underlying probability distribution. Robust versions of the semi-infinite programming and nonlinear programming relaxations from Chapter 3 are also presented and analyzed. The case of polyhedral uncertainty is emphasized for finite probability spaces. There is a large-scale implementation issue here as well, and aggregation is suggested again as a possible solution approach.In Chapter 6 we consider multi-period stochastic optimization problems with increasing concave stochastic order constraints. We put a multivariate increasing concave stochastic order constraint on a vector of performance measures across all time periods. We derive optimality conditions similar to those in Chapter 3. We also show that there is a companion auxiliary control problem for this class of multi-period problems that can be solved with dynamic programming. We comment on using duality decomposition to solve instances of this problem on finite probability spaces, such as those obtained via conditional sampling
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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