1,721,018 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
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
A recursive algorithm for nonlinear least-squares problems
No full textThe solution of nonlinear least-squares problems is investigated. The asymptotic behavior is studied and conditions for convergence are derived. To deal with such problems in a recursive and efficient way, it is proposed an algorithm that is based on a modified extended Kalman filter (MEKF). The error of the MEKF algorithm is proved to be exponentially bounded. Batch and iterated versions of the algorithm are given, too. As an application, the algorithm is used to optimize the parameters in certain nonlinear input–output mappings. Simulation results on interpolation of real data and prediction of chaotic time series are shown
A decision support tool based on a queueing model for performance analysis and optimization of container terminals
No full textThe constant growth of container traffic has posed the problem of devising efficient tools for the management of logistics activities at container terminals, where a number of tasks are carried out, including loading, unloading and storing. To this purpose, a decision support system (DSS) based on a discrete-time dynamic model of container flows in maritime terminals is proposed for performance analysis and simulation.
The tool can be used both for planning and real-time decision support in the management of the handling resources. More specifically, on the one hand, it is possible to evaluate the performance of a container terminal (in terms of different indexes of interest) and the improvements attainable by possible changes in the resources (for example, to understand the impact of adding or removing a crane) in various scenarios. On the other hand, the DSS is also able to compute a real-time strategy of resource allocation aimed at optimizing the overall efficiency of the operations dynamically. The model at the core of the DSS has control inputs that represent the percentages of capacities of the available handling machines used to move containers inside a terminal. We regard such capacities as limited resources to be allocated to the various operations they are required for. By suitably choosing different cost functions, it is possible to address various optimization problems that can take into account different performance indexes. The model is based on a discrete-time state equation that describes the dynamic behaviour of the quantities of containers stored or transferred across a maritime terminal. It is basically a system of queues that represent either temporal storages or delays that may occur during the container transfers due to the unavailability of resources.
The proposed tool integrates simulation and optimization in an easy-to-use fashion, thus making it useful also for those with no experience in simulation. An example of the possible uses of the tool is reported to show its effectiveness in evaluation of the terminal performance.
The paper is structured as follows: Section 1 concerns introduction; Section 2 describes the main features of the tool, specifically for performance analysis and container flow optimization; Section 3 contains a simulation case study that shows possible uses of the DSS; Section 4 illustrates the basic ideas of the dynamic model of the container flows that is the basis of the proposed DSS; finally, Section 5 addresses conclusions and further comments
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
- …
