1,721,049 research outputs found
Objektive Audiometrie im Kindesalter: optimaler Informationsgewinn und richtige Interpretation
No full textGoing 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
Performance optimized signal processing in objective audiometry - Digital tools for the efficient measurement and use of AEP and OAE
No full textThe objective methods of audiometry are based on the registration of noisy signals of small amplitude which are contaminated with interferences of diverse and variable sources. The reconstruction of the target signal is performed by selection and averaging of many signal epochs. Beyond these basic digital tools of signal processing, whose practical value is well-proven, other procedures which have never been established in commercial devices are potentially suitable to further improve the signal quality and the reliability of its detection. They are subject of this paper, as well as several new approaches, some of which have already been proven as useful in clinical practice while others are still awaiting their practical application. By implementation of these procedures, the precision and reliability of the diagnostic conclusions derived from otoacoustic emissions (OAE) and auditory evoked potentials (AEP) can be enhanced substantially.This review aims to exploit the potential of signal processing to the highest possible extent. Its main topics are a digital filter optimized for the detection of AEPs, the extension of averaging to the polarity of the signal, the extraction of parameters qualified as measures for quality and significance, and the time-differential analysis of correlation. Furthermore, the digital superposition of several independent recordings, the use of the amplitude distribution density and an algorithm developed to reduce the impact of residual noise on the response threshold are described for the first time
Optimized signal processing in objective audiometry - Digital tools for the efficient use of AEP und OAE
No full textThe objective methods of audiometry rely on the registration of noisy signals of low amplitude which are contaminated with interferences of diverse and variable sources. The reconstruction of the target signal is performed by selection and averaging of many signal epochs. Beyond these basic digital tools of signal processing, whose practical value is well-proven, further procedures which have never been established in commercial devices are potentially suitable to further improve the signal quality and the reliability of its detection. They are subject of this paper, as well as several new approaches, some of which have already been proven as useful in clinical practice while others are still awaiting their practical application. By implementation of these procedures, the precision and reliability of the diagnostic conclusions derived from otoacoustic emissions (OAE) and auditory evoked potentials (AEP) can be enhanced substantially.This review aims to exploit the potential of signal processing to the highest possible extent. Its main topics are a digital filter optimized for the detection of AEP, the extension of averaging to the polarity of the signal, the extraction of parameters qualified as measures for quality and significance, and the time-differential analysis of correlation. Furthermore, the digital superposition of several independent recordings, the use of the amplitude distribution and an algorithm developed to reduce the impact of residual noise on the response threshold are described for the first time.Objektive Hörprüfmethoden beruhen auf der Rekonstruktion von verrauschten und mit diversen variablen Störeinflüssen überlagerten Signalen kleiner Amplitude. Die zur Bewältigung dieser Aufgabe etablierten Methoden sind die Selektion und Mittelung von Signalabschnitten. Mit diesen bewährten Instrumenten ist jedoch das heutige Potential der digitalen Signalverarbeitung bei weitem nicht ausgeschöpft. In diesem Artikel wird an bereits beschriebene aber in Vergessenheit geratene Verfahren erinnert und es werden neue Ansätze vorgestellt, die sich teilweise bereits in der klinischen Anwendung als nützlich erwiesen haben, zum anderen Teil noch auf ihre praktische Erprobung warten. Durch die Umsetzung der beschriebenen Verfahren können Präzision und Zuverlässigkeit der aus den otoakustischen Emissionen (OAE) und den akustisch evozierten Potentialen (AEP) abgeleiteten diagnostischen Aussagen erheblich gesteigert werden.Zu den Inhalten dieser Übersicht zählen ein für den AEP-Nachweis optimiertes digitales Frequenzfilter, die Erweiterung der Signalmittelung auf die Polarität des Eingangssignals, die Extraktion von Parametern zur Gewinnung von Maßen für Qualität und Signifikanz und die zeitlich differentielle Korrelationsanalyse. Erstmals beschrieben sind die digitale Superposition mehrerer unabhängiger Messkurven zur besseren Darstellung einzelner Signalkomponenten, die Nutzung der statistischen Verteilung der Amplitude und ein Algorithmus zur Berücksichtigung der Reststörung bei der Schwellenbestimmung
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
GENOMEWIDE GENE EXPRESSION PROFILINGIN ARABIDOPSIS THALIANA REVEALED NEW TARGETS OF ABSCISIC ACID AND LARGELY IMPAIRED GENE REGULATION IN THE ABI1-1 MUTANT
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