1,721,055 research outputs found
Revising the UIC 406 method: Revenue generating capacity
No full textRailway as a sustainable mode of transportation plays a great role in socio-economic welfare of societies. The impending post peak oil era, higher fuel costs and concerns for climate change have increased the importance of railways more than ever before. In this situation, railways are struggling to accommodate ever increasing demand on the limited infrastructure and tackle the capacity challenge. This involves a wide range of hard and soft measures to be taken while decision making in the railway industry is a cumbersome process. It is an immensely expensive industry to build, operate and maintain. Decisions have long term impacts and major projects are time consuming to implement. There are so many entities and complex interactions involved that leaves a domino effect on any decision taken. In order to overcome these complexities and improve the efficiency of railway transportation, it is essential to have a systems engineering approach toward railway capacity. This is of utmost importance as railway capacity is the junction of different disciplines in the railway industry. This article adopts a holistic and systems engineering approach to the complex issue of railway capacity that can facilitate efficient decision making
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
Capacity Statement for Railways
Get PDFThe subject “Railway capacity” is a combination of the capacity consumption and how the capacity is utilized. The capacity utilization of railways can be divided into 4 core elements: The number of trains; the average speed; the heterogeneity of the operation; and the stability. This article describes how the capacity consumption for railways can be worked out and analytical measurements of how the capacity is utilized. Furthermore, the article describes how it is possible to state and visualize railway capacity. Having unused railway capacity is not always equal to be able to operate more trains. This is due to network effects in the railway system and due to the fact that more trains results in lower punctuality
Reliability of Railway Operation
Get PDFDelays in railway networks cause problems in the daily operation and result in reduced reliability of the railway operation. The article defines methods based on the two closely related concepts of regularity and punctuality. These methods cover the traditional measures for trains based on the realized and simulated operation but also more advanced methods that take the passengers’ experience into account. This is done by using passenger delay models that estimates the delays of the passengers based on train delays and knowledge about the passenger behavior. For high‐frequent operation, the traditional measures cannot describe the perceived service reliability of the passengers as passengers can travel with delayed trains without knowing of the delay. Here, the article presents other reliability measures. Using the presented reliability approaches, the article illustrates how the reliability of railway operation can be improved through reliability analyses
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