1,721,041 research outputs found
VARIABLES INFLUENCING SPEED DISTRIBUTION ON URBAN ARTERIALS AND COLLECTORS
No full textSpeeds are affected by several variables such as driver characteristics, vehicle performance, road geometrics, environmental conditions and driving regulations. A knowledge of the relationship between speed and such variables allows conscious speed management on existing and planned roads, with the aim of constraining drivers to select a speed consistent with the posted speed limit. This relationship is of great interest to those who wish to achieve roadway functionality and improve overall safety. Focusing on this objective, some contributions concerning urban roads are already available in literature with the caveat that they can be applied only to specific road types and recently built-up areas. Moreover, they refer mainly to the 85th percentile of speed. Lastly, they can only be applied in locations which are homogeneous in terms of environment, driving regulations and vehicle type. The research aims to establish the correlation of roadway features to operating speed by elaborating panel-data models for the urban environment. The paper presents the results of an investigation carried out on Italian urban arterials and collectors within the municipality of Torino (Italy). The fact that this area is characterized by dissimilar geometric features facilitated the inclusion and study of a fully representative range of variables. Models were calibrated by combining the complete dataset and disaggregating it for the different road typologies. The results showed that, when consideration was given to all the selected variables, some variables were found to be ever present and statistically significant for all model
Outflow Graft Tunneling Through the Transverse Sinus for HeartWare HVAD Implantation: An Additional Contribution
No full textNo abstract availabl
Feasibility study for the use of VR technology for driver training - Final Report
No full textDenne rapporten er en mulighetsstudie om bruk av Virtual Reality (VR) - teknologier i føreropplæring. Studien er finansiert av Statens vegvesen. Formålet med mulighetsstudien er å utrede de pedagogiske mulighetene som ligger i bruk av nye innovative teknologier som VR-/AR-briller for å styrke og underbygge læringsutbyttene som beskrives i læreplan for førerkortklasse B. Nord universitet har planlagt, initiert, utført og analysert forskningsaktiviteter for å svare på disse spørsmålene. Det er gjennomført en litteraturgjennomgang fra fire ulike perspektiver: utdanning, psykologi, føreropplæring og teknologisk utvikling. I tillegg har det blitt utformet spørreundersøkelser for å gi svar på forskningsspørsmålene, spesielt de som er rettet mot målgruppene trafikklærere og trafikklærestudenter. Ved å knytte sammen resultatene fra litteraturgjennomgangen og spørreundersøkelsene foreslår rapporten mulige scenarier som kan være egnet til det angitte formålet.This report represents the final outcome of a project funded by the Norwegian Public Roads Administration (from now on, NPRA) regarding the investigation about the use of Virtual Reality technologies in driving education. The purpose of this feasibility study is to understand if the new educational and pedagogical possibilities given available by these innovative technologies, such as VR/AR glasses, could address some of the learning outcomes included in the actual Curriculum for Driving Licence regarding category B vehicles. Nord University, after being selected as the most qualified research institution suitable for this work, have planned, initiated, conducted and analyzed research activities in order to address those questions. In details, a literature review has been performed, regarding three main different points of view: education, psychology, driving education and technological development. In addition to that, a survey has been specifically designed to answer the identified research questions, with a special attention to two target groups: driving instructors and driving instructors’ students. Coupling together the outcomes from both the two mentioned methodologies, some possible scenarios have been identified as suitable for the specific purpose.publishedVersio
Vulnerability of road networks along transalpine corridors
No full textNatural and man-made extreme events have a great impact on the social cohesion and economic development of territories. The road network plays a key role in the aftermath of any such events by assuring accessibility to land and populated areas, and by facilitating the management of emergencies. Nevertheless, this role is limited in mountainous and valley areas where the road network density and capacity are low and hence more vulnerable.
In the paper, the authors evaluated the vulnerability of such road networks in terms of reduced accessibility, an approach that the authors considered more pertinent than others available in literature. The two most important Italian North-Western transalpine corridors located along the Susa and Aosta valleys were selected as case studies, thus allowing for the investigation of cases that differ in terms of territorial structure and network layout. For the purpose of this study, the authors developed a dedicated GIS code based on the graph theory. The results obtained enabled the identification of those road sections which are extremely vulnerable, and where future investment should be directed in order to limit the effects of possible network failures in the event of emergencies
The effects of road geometrics and traffic regulations on driver-preferred speeds in northern Italy. An exploratory analysis
No full textSpeeds are affected by several variables such as driver characteristics, vehicle performance, road geometrics, environmental conditions and driving regulations. It is therefore important to study the relationships between speed and such variables in order to facilitate conscious speed management on existing and planned roads, and to induce drivers to select a speed consistent with the posted limit. This relationship is of great interest to those who wish to achieve roadway functionality and improve overall road safety. A small number of studies have focused on this objective; however, few of them concern urban roads and they are limited to specific road types and recently built-up areas. These studies often refer to the 85th percentile of the speed distribution and are relevant to locations which are homogeneous in terms of geometry, environment, driving regulations and vehicle type. This paper presents results obtained from a study carried out on urban arterials and collectors characterized by dissimilar geometric features which facilitated the inclusion of a fully representative range of variables. A general model able to predict operating speed for a generic percentile was calibrated using three different strategies: (a) a simple multiple regression analysis in which the variables were selected using the Bayesian Information Criterion (BIC); (b) the analysis of covariance method including random effects on the same set of variables as in (a); and, finally, (c) the analysis of covariance method with random effects and a new selection of variables (again using BIC). The analysis shows a dramatic variation in results depending on the method selected. In particular, when random effects are considered, almost all the variables are found to be statistically significan
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
Forma, attitudine e destino. Esperienze di metaprogettazione per il design. Roma, P.zza della Repubblica
No full textLa mostra, costituita da vari manifesti, ha illustrato il contributo dato da Arnheim alla Scuola di Design romana (Istituto Superiore per il Disegno Industriale), nella quale egli stesso insegnò negli anni Settanta del secolo scorso
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
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