1,721,082 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
The treatment of cochleovestibular incidents after diving
No full textBackground. There has been a steady increase of recreational scuba divers in the last years. The majority of diving associated diseases involve otorhinolaryngology, the most important of which are cochleovestibular dysfunctions as these can lead to permanent inner ear failure. Material and methods. We discuss the origin and clinical symptoms, as well as the therapy, of both inner ear barotrauma and inner ear decompression illness. Our own experiences are considered together with a review of the literature from the last decade. Results. Inner ear decompression illness seems to be a relatively common diving associated incident and is not as rare as previously thought. Discussion. Hyperbaric oxygen therapy is the treatment of choice for patients with inner ear decompression sickness, but is contraindicated in patients with inner ear barotrauma. As long as an inner ear decompression illness can not be ruled out, we suggest that every patient should be treated using hyperbaric oxygen therapy but only after bilateral paracentesis
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
Solving many-objective optimisation problems using partial dominance
No full textMost optimisation problems have multiple, often conflicting, objectives. Due to the conflicting objectives, a single solution does not exist, and therefore, the goal of a multi-objective optimisation algorithm (MOA) is to find a set of optimal trade-off solutions. Pareto dominance is used to guide the search and compare the quality of two solutions of a multi-objective optimisation problem, where solutions equal in quality are referred to as being non-dominated. However, many-objective optimisation problems (MaOPs) have more than three objectives and the number of non-dominated solutions increases as the number of objectives increases. Therefore, Pareto dominance is no longer an effective approach to guide the search. Recently, a partial dominance approach has been proposed to address this problem. Preliminary results indicate that the partial dominance relation shows promise and scales well with increasing number of objectives. This article extends that study by incorporating the relation in another MOA, applying the relation at different frequencies and evaluating the performance of the relation against both the original MOAs and state-of-the-art algorithms. The results provide further evidence that the partial dominance relation is an efficient approach to solve MaOPs.No Full Tex
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
Dynamic Multi-objective Optimization Using Computational Intelligence Algorithms
No full textMulti-objective optimization problems (MOPs) have multiple, often conflicting objectives where an improvement in one objective leads to the worsening of at least one other objective. The goal of a multi-objective algorithm (MOA) is to find a set of optimal trade-off solutions that is both accurate and diverse. However, many real-world problems are dynamic in nature where at least one objective and/or constraint changes over time. A dynamic multi-objective algorithm (DMOA) must therefore be able to track the changing set of optimal trade-off solutions over time. This chapter highlights issues that have to be addressed when evaluating the performance of DMOAs. It discusses areas that require further research, including decision making and analyzing the behavior of DMOAs. Emerging areas, and how they can impact on research in the field of dynamic multi-objective optimization (DMOO), are also highlighted.No Full Tex
Dynamic Multi-objective Optimisation Problems with Changes of Varying Frequency and Severity
No full textMany real-world problems are dynamic with mul-tiple, often conflicting, objectives, referred to as dynamic multi-objective optimisation problems (DMOPs). Furthermore, many problems' changes occur at varying intervals, with varying frequency and severity. Benchmark functions are used to eval-uate the performance of dynamic multi-objective optimisation algorithms (DMOAs) by representing various characteristics that are representative of typical real-world problems. This paper presents an approach to change existing benchmarks into DMOPs incorporating changes at varying intervals with varying frequency and severity. To demonstrate the approach, three variations of the dynamic non-dominated sorting genetic algorithm II (DNSGA-II) are evaluated on both benchmarks with changes occurring at the same interval and with the same frequency and severity throughout the run, as well as benchmarks with changes occurring at varying intervals with varying frequencies and severities of change.No Full Tex
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