1,721,719 research outputs found
A dynamic strategy-based path choice modelling for real-time transit simulation
No full textThe main objective of this chapter is to present a behavioural assumption and model formulation framework for transit path choice modelling with a descriptive travel strategy approach. Such modelling is suitable for real-time run-oriented simulation-based mesoscopic assignment models, which can support real-time predictive info and real-time operations control when considering unreliable transit systems, with predictive info on the characteristics of the services. The introductory section is devoted to classifying transit assignment models in relation to their use in real-time simulation, and is followed by a section with the concepts of strategy, of the dynamic link diversion choice rule and of anticipated utility, as a combination of experienced and forecasted travel attributes. The second part deals with the path choice model formulation and the relative hyperpath choice set generation issue. The path choice models of three mesoscopic transit simulation tools presented in the literature, namely MILATRANS, BUSMEZZO and DYBUSRT, are also recalled and analysed within this presented framework. Finally, some concluding remarks and research prospects for this topic are reported
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
Adaptive correlation diversity for a CD900-like systems in an urban mobile radio environment
No full text
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
Combined Space and Adaptive Correlation Diversity in the CD900 System
No full textThe CD900 multiple-access system is enhanced by employing adaptive correlation diversity coupled with either switched or combining diversity. The residual average probability of symbol error is eliminated for probability of symbol error P//e greater than 10** minus **5, and the channel snr is within 5 db of that for the AWGN channel when P//e equals 10** minus **3.link_to_subscribed_fulltex
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
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