1,720,952 research outputs found
Does conducting activities while traveling reduce the value of time? Evidence from a within-subjects choice experiment
No full textMany studies about conducting activities while traveling start from the hypothesis that conducting onboard activities reduces the value of time (VoT). However, surprisingly limited empirical evidence is provided for this hypothesis. The few studies that aim at providing this evidence face methodological problems in the sense that effects attributed to conducting onboard activities are confounded with differences between groups. This paper further develops and applies a solution for this problem proposed by Wardman and Lyons (2016). In essence, this method includes constructing a within-person choice experiment, which involves that the same respondents make choices in a context that enables conducting activities, as well as in a context that does not enable conducting activities. This method is applied in a study that collected data from 820 train travelers in the Netherlands. The results show that as expected, the VoT in the activity context is significantly lower than the VoT in the non-activity context, which thus supports the hypothesis. Reduction in VoT due to conducting onboard activities is around 30% for commuters, while leisure travelers who prefer to read lose almost half their VoT value. In addition, this paper discusses how the estimated VoT reduction values can be interpreted as the Value of Activity (VoA), which can be used for appraising investments aimed at reducing the disutility of travel other than by means of reducing travel time, such as improving Internet connections.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Transport and LogisticsTransport and Plannin
Sharing concepten in stadslogistiek: The Big Five
No full textHet delen van ongebruikte en/of onderbenutte middelen kan nieuwe verbeteringen opleveren in de logistieke waardeketen. In vijf sectoren van het stedelijk goederenvervoer, te weten stadslogistiek, bouwlogistiek, transport & warehousing (retaillogistiek), zorglogistiek en servicelogistiek, worden concepten voor het delen van diensten bestudeerd voor de hele stad Rotterdam. Op basis van onze belangrijkste case study-bevindingen kan worden vastgesteld dat er binnen de sectoren van het stedelijk goederenvervoer nogal wat verschillen bestaan met betrekking tot de maturiteit van delen. In deze paper is per sector weergegeven wat de volgende implementatie stappen zijn.Transport and Logistic
Synchromodal transport: From theory to practice: Case study port of Rotterdam: Identifying the success/fail factors
No full textContainer port competitiveness is generally conceptualized as being driven by straightforward criteria, such as port costs, handling efficiency, hinterland connectivity, and the quality of infrastructure and services. Synchromodal freight transport service is an emerging and developing concept of freight transport operations, as shippers and carriers consider hinterland, short-sea, and deep-sea connectivity as major port choice criteria to run these port operations smoothly. Although scientists claim that synchromodality is a promising concept with a lot of potential advantages synchromodal transport is currently implemented at limited scale.In this study a survey is carried out among 30 different small/medium enterprises (SMEs) in the field of port logistics to identify the success/fail factors of using synchromodal transport in practice. Companies are classified as experienced or inexperienced users of synchromodal transport. The experienced users have a stronger attention to the operational factors of synchromodal transport. Their experiences with flexibility, availability of infrastructure, damage-control and specific data sharing seems to be determining factors in their usage of synchromodal transport. The non-experienced companies are hindered by ignorance of synchromodality and focus on issues such as lack of knowledge, how to start knowledge, lack of transparency and complexity of synchromodal transport. Our findings suggest that to increase the share of synchromodal transport it is necessary that companies and policy makers who want to encourage the use of synchromodal transport should make different action plans considering the level of experience of the enterprises.Transport and Logistic
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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