1,720,958 research outputs found
European Cultural Heritage
No full textKolbeck, Felix: Europe between the past and the present : Short trip to the 2018 Capitals of Culture
Rauscher, Marion: Cities in flux or where is the money flowing to? : How London and Frankfurt developed into international financial centres
Feuerstein, Lisa & Busacker, Torsten & Xu, Jingjing: Competition on rails : Liberalization of the European railway market – a challenge
Schröder, Tilman: Between Ideal and Reality : Linguistic diversity in the European Union
Klassen, Norbert: Studying beyond borders : Pilot project between Ireland and German
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Ein Beitrag zu einem künftigen Rollführungssystem (A-SMGCS)
No full textThema der vorliegenden Arbeit ist die Optimierung von Flughafen-Boden- Rollverkehr. Weltweit steigt die Nachfrage nach Luftverkehr. Damit steigt auch die Anzahl der Flugbewegungen an Flughäfen. Insbesondere große Drehkreuzflughäfen stoßen weltweit schon heute an ihre Kapazitätsgrenzen. Kapazitätserweiterungen durch Neu- oder Ausbauten sind aber nur noch in Ausnahmefällen möglich. Besondere Bedeutung kommt daher der effizienteren Nutzung der bestehenden Infrastruktur zu. Der Boden-Rollverkehr wurde bisher weitgehend als unbegrenzte Ressource angesehen. Eine genaue Analyse zeigt aber, dass der Rollverkehr durchaus ein Kapazitätsengpass sein kann. Durch die Planung und Optimierung der Routenführung des Rollverkehrs soll daher ein Effizienzgewinn erzielt werden. Ein solches Optimierungsverfahren stellt als Planungskomponente zugleich einen wichtigen Bestandteil eines künftigen Rollverkehrsführungssystems (A-SMGCS) dar. Eine Analyse des Rollverkehrs, seiner Funktion im Betriebsablauf und seiner für eine Modellierung wichtigen Eigenschaften führt zum Optimierungsziel der minima-len mittleren Rollzeiten. Ausgehend von dieser Zielsetzung wird eine Zielfunktion formuliert, deren Nebenbedingungen die Systemeigenschaften des Rollverkehrs mathematisch beschreiben. Es wird ein Algorithmus entwickelt, der kürzeste konfliktfreie Rollrouten mit Hilfe von Zeitfenstern und zielgerichteter Suche plant. Zur Validierung dieses Rollverkehrs-Algorithmus wird ein großer Verkehrsflughafen graphentheoretisch modelliert. Mit Hilfe des neuen Algorithmus werden dann realistische Rollverkehrs-Szenarien optimiert. Die Validierung selbst erfolgt sodann durch den Vergleich mit echten, im Flugbetrieb gemessenen Rollverkehrszeiten. Der Vergleich ergibt, dass der neue Algorithmus einen deutlichen Effizienzgewinn gegenüber dem heutigen Rollverkehrsbetrieb ermöglicht. Die Zeitersparnis für jeden Rollvorgang beträgt im Mittel mindestens ca. 5%, wobei besonders hervorzuheben ist, dass der Algorithmus in keinem untersuchten Fall im Mittel schlechter abschnitt als die Realität. Die maximale erreichte Zeitersparnis lag in allen untersuchten Szenarien konsistent bei deutlich über 20%. Damit wurde gezeigt, dass die Optimierung des Rollverkehrs das Potenzial besitzt, den Flughafenbetrieb effizienter zu machen. Zugleich wurde bewiesen, dass der in dieser Arbeit vorgestellte Algorithmus grundsätzlich geeignet ist, dieses Potenzial zu erschließen.This thesis presents a new algorithm for Airport Ground Traffic Optimization. Demand for air transportation is constantly growing world-wide, and with it the number of aircraft movements at airports. Especially big hub airports in a number of countries are already operating close to or above their respective capacity limits. However, enhancement of airport capacity by building new airports or extending the existing ones is not usually an option. Hence, exploiting the existing infrastructure efficiently is of paramount concern. Aprons and taxiways have up till now been usually regarded as an unlimited resource. Thorough analysis proves, however, that taxi traffic can indeed become a limiting factor in certain instances. Thus, it is hoped that planning and optimizing taxi routing will lead to greater efficiency. Optimization of taxi traffic will also be required as a planning component of a future Advanced Airport Surface Movement Guidance and Control System (A-SMGCS). An analysis of taxi traffic, of its role in airport operations and of its properties which affect modelling make clear the necessity to minimize average taxi times. This necessity is translated into an objective function, the side conditions of which describe the system properties of taxi traffic mathematically. An algorithm is developed that plans shortest conflict-free taxi routes by means of time windows and targeted search. This taxi traffic algorithm is validated by being applied to the graph model of a large airport. Using the new algorithm, realistic taxi traffic scenarios are optimized. Validation itself is achieved by comparing the optimization results with actual taxi times observed in real-life airport operations. The result of this comparison is that the new algorithm increases efficiency significantly beyond present taxi operating procedures. The time saved per taxi roll is about 5% on average. It is especially noteworthy that in none of the instances studied does the algorithm perform worse than the present operations. The maximum time saved was consistently above 20% in all the scenarios studied. It was thus proved that optimizing taxi traffic has the potential to make airport operations more efficient. It was also shown that the algorithm presented in this thesis might help turn this potential into actual savings
Variations on the Author
No full text“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
No full textWe 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
No full textWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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