1,720,966 research outputs found
Investigating infrastructure, superstructure, operating and financial efficiency in the management of Turkish seaports using data envelopment analysis
No full textThe purpose of this study is to measure the management performance of thirteen Turkish seaports by undertaking the simultaneous investigation of four dimensions of management performance, namely, infrastructure, superstructure, operating and financial efficiencies. Based on their pure technical and scale efficiency scores, short and long term managerial implications were provided. Results show that low labor productivity and high expenses are the major sources of inefficiency of Turkish seaports. Public seaports exhibit better performance in infrastructure efficiency, whereas private seaports are superior in superstructure, operating and financial efficiency. While private seaports suffer from inappropriate scale size, public seaports suffer from managerial incompetency. (C) 2015 Elsevier Ltd. All rights reserved
Incorporating value judgments into port efficiency measurement models: insights from Turkish ports
No full textSeveral inputs and outputs which have relative contributions to overall port performance are used in port efficiency measurement models. While some inputs are vital to produce higher output, some others are relatively less important. Also, for managers, some outputs are more desirable than others. Ignoring the issue of "relative contributions" and considering all inputs and outputs to be of equal importance may lead to unreliable results. This research aims to incorporate value judgments and strategic thinking into port efficiency measurement models. Data envelopment analysis is used to estimate port efficiency, and the assurance region method is applied to incorporate expert opinions into data envelopment models. Results show that expert opinions have a great impact on efficiency scores and may lead to dramatic decreases in average efficiency. The reasons of such changes are explained with the use of optimal weights and virtual inputs/outputs, and the necessity of value judgments in port efficiency measurement models is demonstrated
Estimating the operational and service efficiency of bus transit routes using a non-radial DEA approach
Get PDFIn public transportation literature, researchers increasingly tend to evaluate the service efficiency of bus transit units in addition to their operational efficiency. Evaluation of both operational and service efficiencies provides a more comprehensive performance analysis for decision-makers. This paper proposes a non-radial data envelopment analysis (DEA) approach to measure the operational and service efficiencies simultaneously. Benefits of the proposed approach are demonstrated by applying the model to assess the performance of a bus transit company's routes. The analysis results show that the proposed approach ensures optimal operational and service efficiency scores and provides applicable input targets for each route
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
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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