1,720,964 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
Resource allocation in the next generation of wireless networks: vehicular and energy harvesting systems
Full text linkThe fifth generation (5G) of wireless communication networks is expected to enable advanced network services that usually come with stringent quality-of-service (QoS) requirements, such as high reliability, ultra-high speed, low latency, and user fairness. Given such sophisticated QoS constraints and the ever-increasing number of connected devices in 5G networks, the need for an optimal management of network resources is indispensable. In this thesis, we mainly focus on designing novel resource allocation algorithms considering the intrinsic characteristics of vehicular networks, i.e. one of the most advanced 5G-enabled networks. On the other hand, with the large-scale deployment of future wireless networks, energy issues, such as the increase in CO2 and electromagnetic emissions incurred from the operation of battery-powered devices, are emerging and causing enormous concerns for network planners. Consequently, energy efficiency and sustainability have quickly become crucial criteria for 5G systems. To achieve these criteria, energy harvesting techniques that allow wireless devices to harness energy from the ambient environment have been proposed. The integration of this concept into the 5G-enabled systems is considered as a key-enabler for green and sustainable future networks. The advent of energy harvesting systems is set to introduce energy constraints in the network resource management, creating new challenges in designing resource allocation algorithms. Therefore, addressing these new challenges in energy harvesting networks is also a main topic in this dissertation.
In this regard, chapters 2 and 3 provides advanced energy harvesting frameworks that tackle energy concerns in future wireless networks, while chapters 4, 5, and 6 focus on designing new access strategies for vehicular networks that enhance the network performance in terms of latency and reliability. Numerical results are provided to verify the efficiency and advantages of our proposed schemes over other benchmark schemes
Faire und effiziente überschneidungsfreie Veranstaltungszuteilung in Digicampus
Full text linkIT-Systeme zur Unterstützung der Organisation und Durchführung von Hochschullehre sind heutzutage zahlreich bei vielen Hochschulen in Verwendung. Diese Systeme sollen die Durchführung von typischen Lehrveranstaltungsformen wie beispielsweise Vorlesungen mit zugehöriger Übung oder Blockveranstaltungen beziehungsweise Praktika vereinfachen. Die zentrale Lehr- und Lernplattform Digicampus der Universität Augsburg wurde im Rahmen der Bachelorarbeit um den Bundled Probabilistic Serial Algorithmus und um entsprechende Benutzeroberflächen für die intuitive Präferenzerhebung und Konfiguration der Verteilung erweitert, sodass Lehrenden die Organisation von Übungen mit beschränkter Teilnehmeranzahl erleichtert wird. Insbesondere ist es das Ziel, den Studierenden möglichst gut und fair ihre Präferenzen in der Zuteilung ihrer Übungsgruppe zu erfüllen, ohne dass zeitliche Überschneidungen auftreten. Es werden zunächst die Funktionsweise und der theoretische Hintergrund des Algorithmus erläutert. Außerdem werden die Implementierungen bezüglich der Erweiterung des Digicampus sowie der Optimierungskomponente als Microservice erklärt. Abschließend wird anhand von zwei anonymisierten Datensätzen aus dem Sommersemester 2018 und dem Wintersemester 2019/2020 gezeigt, dass die meisten Studierende durch diese Methode eine zufriedenstellende überschneidungsfreie Zuteilung erhalten
Three Essays on Exchanged-traded funds and Institutional ownership
Full text linkThe first essay examines the replacement effect of smart beta ETFs on closet-factor active mutual funds. The results show that smart beta ETFs offer factor exposures at lower fees and, therefore, higher risk-adjusted returns than closet factor funds. Investors notice the benefits of smart beta ETFs and replace closet factor funds with these ETFs. Closet factor funds are at higher risks of being replaced when investors are sophisticated, when the market share of smart beta ETFs increases, and after 2012. The findings illustrate the dynamic changes in investor preference towards investment products that bring similar or greater benefits at a lower price.
Actively managed ETFs are new but fast-growing products in the financial markets. The second essay studies whether these funds employ active management and deliver better risk-adjusted returns to the investors than their passive peers. The sample consists of ETFs investing in US equity and international equity from 2008 to 2021. The results suggest that actively managed ETFs investing in US equity, including non-transparent funds, neither significantly differ in their management style nor deliver better risk-adjusted returns to the investors than their passive counterparts. However, there is some evidence of outperformance from active ETFs that invest in international markets. Based on net flows to these funds, active ETF flows do not seem to have a stronger response to the "skill" components of the fund returns, suggesting that flows to active ETFs may not be as "smart" as expected.
The prior literature documents that institutional investors, especially those with large and persistent holdings, play an essential role in the corporate governance of their investee firms. The third essay examines whether institutional ownership stability can enhance product quality management. Using a sample of product recall incidents from 2012 to 2021, we find that firms with more stable institutional investors have a lower probability, frequency, and severity of recall incidents and adopt a proactive product-recall strategy. The findings support the monitoring theory of stable institutional investors that they can effectively reduce product failures, which jeopardize a firm long-term performance and value
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
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
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