1,720,988 research outputs found
When to regulate airports: A simple rule
Get PDFLanding fees at airports are regulated almost all over the world since airports are assumed to abuse their market power. We find that monopolistic airports have an incentive to restrain landing fees when they generate additional non-aviation revenues and that the optimal landing fee decreases in the degree of complementarity of aviation and non-aviation. Furthermore, we show that monopolistic airports will not have an incentive to abuse their market power anymore so that a price regulation becomes inappropriate as soon as non-aviation revenues increase above 50% of all airport revenues. --airport regulation,aviation and non-aviation revenues,complementarity of aviation and non-aviation,locational rents
An international agreement with full participation to tackle the stock of greenhouse gases
Get PDFThis paper analyzes greenhouse gas emissions that build up an atmospheric stock which depreciates over time. Weakly renegotiation- proof and subgame perfect equilibria in a game of international emission reduction exist if countries put a sufficiently high weight on future payoffs, even though there is a discontinuity in the required discount factor due to the integrity of the number of punishing countries. Treaties are easier to reach if the gas depreciates slowly. --global warming,international agreement,weak renegotiation-proofness
Replik auf den Beitrag von Gernot Sieg und Berthold U. Wigger
No full textHolger Mühlenkamp, Deutsche Universität für Verwaltungswissenschaften Speyer, nimmt Stellung zu einem Beitrag von Gernot Sieg und Berthold U. Wigger aus dem ifo Schnelldienst 22/2018 zum Thema »Auch in Zukunft Verkehrsinfrastruktur in ÖPP bereitstellen«. In seinem Kommentar stellt Holger Mühlenkamp die Argumente vor; warum er eher geringe Möglichkeiten für wirtschaftliche Öffentlich-private Partnerschaften sieht
Vor allem der Wille zählt – wie die Verkehrswende gelingen kann:Interview mit Prof. Dr. Gernot Sieg
No full textDas geplante 49-Euro-Ticket der Bundesregierung für den öffentlichen Nahverkehr kann nicht darüber hinwegtäuschen, dass die deutsche Verkehrswende eher schleppend vorangeht. Woran liegt das, und welche Lösungsansätze sollten verfolgt werden? Welche Schwachstellen hat der Bahnverkehr in Deutschland? War das 9-Euro-Ticket eine sinnvolle Maßnahme der Bundesregierung? All diese Fragen beantwortet der Verkehrwissenschaftler Prof. Dr. Gernot Sieg im Podcast
Vor allem der Wille zählt – wie die Verkehrswende gelingen kann:Interview mit Prof. Dr. Gernot Sieg
No full textDas geplante 49-Euro-Ticket der Bundesregierung für den öffentlichen Nahverkehr kann nicht darüber hinwegtäuschen, dass die deutsche Verkehrswende eher schleppend vorangeht. Woran liegt das, und welche Lösungsansätze sollten verfolgt werden? Welche Schwachstellen hat der Bahnverkehr in Deutschland? War das 9-Euro-Ticket eine sinnvolle Maßnahme der Bundesregierung? All diese Fragen beantwortet der Verkehrwissenschaftler Prof. Dr. Gernot Sieg im Podcast
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
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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