1,721,513 research outputs found
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
A heuristic aproach to solve disassembly lot sizing problems
No full textIn disassembly lot sizing problems the final objective is organize the schedule for disassembly operations in order to recover parts from an initial product in order to satisfy a given demand. This kind of reverse logistic procedures are becoming more and more important every day mainly as a consequence of environmental issues. When a product has arrived at the end of its life their parts can be recycled or used again but we need to organize the operations required in order to obtain the maxim profit and to respect some important constrains. The one studied is a two levels problem without commonality parts. In this project we propose two different methods to solve this disassembly lot sizing problem. The method 1 is divided in three different stages. During the first one, an initial solution is obtained using a fix-and-optimize heuristic. Since the solution after this algorithm can be feasible or not, an algorithm to fix it is proposed in the second stage. In the last stage we propose a tabo research in order to improve the solution. We have used another method which includes exact resolution with integer relaxation and simulated annealing to improve this initial solution. In the last section we show how both methods perform and we compare them
A heuristic aproach to solve disassembly lot sizing problems
Get PDFIn disassembly lot sizing problems the final objective is organize the schedule for disassembly operations in order to recover parts from an initial product in order to satisfy a given demand. This kind of reverse logistic procedures are becoming more and more important every day mainly as a consequence of environmental issues. When a product has arrived at the end of its life their parts can be recycled or used again but we need to organize the operations required in order to obtain the maxim profit and to respect some important constrains. The one studied is a two levels problem without commonality parts. In this project we propose two different methods to solve this disassembly lot sizing problem. The method 1 is divided in three different stages. During the first one, an initial solution is obtained using a fix-and-optimize heuristic. Since the solution after this algorithm can be feasible or not, an algorithm to fix it is proposed in the second stage. In the last stage we propose a tabo research in order to improve the solution. We have used another method which includes exact resolution with integer relaxation and simulated annealing to improve this initial solution. In the last section we show how both methods perform and we compare them
A heuristic aproach to solve disassembly lot sizing problems
Get PDFIn disassembly lot sizing problems the final objective is organize the schedule for disassembly operations in order to recover parts from an initial product in order to satisfy a given demand. This kind of reverse logistic procedures are becoming more and more important every day mainly as a consequence of environmental issues. When a product has arrived at the end of its life their parts can be recycled or used again but we need to organize the operations required in order to obtain the maxim profit and to respect some important constrains. The one studied is a two levels problem without commonality parts. In this project we propose two different methods to solve this disassembly lot sizing problem. The method 1 is divided in three different stages. During the first one, an initial solution is obtained using a fix-and-optimize heuristic. Since the solution after this algorithm can be feasible or not, an algorithm to fix it is proposed in the second stage. In the last stage we propose a tabo research in order to improve the solution. We have used another method which includes exact resolution with integer relaxation and simulated annealing to improve this initial solution. In the last section we show how both methods perform and we compare them
A Multi Objective Optimization via Simulation framework for restructuring traffic networks subject to increases in population
No full textTraffic network design is a complex problem due to its nonlinear and stochastic nature. The Origin-Destiny Traffic Assignment Problem is particular case of this problem. In it, we are faced with an increase in the system vehicle population; and, we want to determine where to set the generating nodes and the traffic consumers, minimizing the current system and trying to reduce necessary investment. Performing optimizations in an analytical way in this kind of problems tends to be really complicated and a bit impractical, since it is difficult to estimate vehicle flows. In this chapter, we propose the use of a Multi-Objective Particle Swamp Optimization together with Traffic Simulations in order to generate restructuring alternatives that optimize both, traffic flow and cost associated to this restructure. This approach allows to obtain a very good approximation of the Pareto Frontier of the problem, with a fast convergence to the low infrastructure cost solutions and a total coverage of the frontier when the number of iterations is high.Fil: Baquela, Enrique Gabriel. Universidad Tecnológica Nacional. Facultad Regional San Nicolás; ArgentinaFil: Olivera, Ana Carolina. Universidad Nacional de la Patagonia Austral. Unidad Académica Caleta Olivia. Departamento de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
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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