1,720,979 research outputs found
Application of Lie group analysis to a mathematical model which describes HIV transmission
No full textNon present
Framework for the evaluation of the quality of pedestrian routes for the sustainability of port–city shared areas
No full textIn recent years, there have been several changes that deeply affected the port-city relationship, due to the evolution of maritime transports, traffic volumes and port infrastructures. Thanks to the expansion of the cruise and yachting sectors and the redevelopment of waterfront and port spaces, shared areas have assumed mixed functions and activities that are attractive for passengers/tourists but potentially also for other users, such as citizens. Often, the unplanned distribution of these heterogeneous functions and activities results in overlapping and intersecting flows of freights/passengers, with the generation of criticalities for vulnerable users. Commonly, each passenger/tourist, and generally more pedestrians, are independent decision-making units, and their route choices depend not only on their trip destination but also on the on the attractiveness of the existing activities, on the geometric characteristics of the path and, generally, on its Level of Service (LOS) and quality, contrary to freight routes, which are generally based on minimum generalized cost values. Thus, having a good non-motorized accessibility is a determining factor for port-city sustainable development. This paper focuses its attention on pedestrian flows in port-city areas and the construction of a methodological framework to evaluate nonmotorized accessibility. The framework analyses the quality of pedestrian displacements, both through the LOS and a utility measure, by taking advantage of Geographic Information System (GIS) tools. The methodology has been tested on the case study of Catania, a medium-sized city located in the south of Italy, whose port is located in an area that has a strategic role due to its proximity to the historic centre. The proposed framework can contribute to providing a guide to transport and urban planners, local and port authorities and decision-makers in port-city planning, identifying criticalities and solutions to enhance the non-motorized accessibility and sustainability of the port systems and urban areas
Sustainability of Freight Transport through an Integrated Approach: The Case of the Eastern Sicily Port System
No full textPort systems, especially if close to the city centre, are affected by significant traffic flows from and towards the port area causing congestion issues, security and several externalities on the mobility system. In fact, the main problems affecting port cities are generated by the mismatch between different vehicle flows (of goods, citizens, cruises, passengers, private cars and heavy vehicles) and the consequent creation of bottlenecks, greatly affecting the functionality of both the port and the city. The objective of this paper is to apply a framework of actions and measures to foster the three pillars of sustainability in the case study of the Eastern Sicily port system, involving the ports of the cities of Catania and Augusta. Data concerning freight traffic and flows have been acquired from the port authority and from the main terminal and logistic operators, while; data on terminal operation efficiency have been acquired from previous studies. The study shows advantages and disadvantages of already implemented measures and new planning scenarios for the two ports that are part of the system. The paper clearly defines the key elements needed to be taken into account when demonstrating efficiency of a ports' system. The methodology can be considered suitable in order to support administrations in the assessment of different alternatives in the short and in the long period
A sustainable framework for the analysis of port systems
No full textThe commercial and industrial growth of the urban areas with consequent specialization of the maritime and land traffic deeply modified in the last centuries the spatial and functional relationship between port and city. Ports became a complex of functions and interactions with the city sharing its commercial, recreational, tourist, cultural, urban spaces and places for leisure. In addition to goods heavy traffic, the new port configuration also attracts important flows of people linked to the cruise sector, passenger traffic and tourism. This mix of activities, while inducing a great potential for transformation and strong changes on the urban economy, generates several externalities on the urban mobility system, such as congestion, accessibility, security and safety issues. The objective of this paper is to propose a framework for actions and measures to foster sustainability in ports. International best practices for passenger and freight port transport have been analysed with a focus on advantages and disadvantages of already implemented procedures, both in the short and in the long term. Most performing measures have been included in the framework, which classify them according to the three pillars of sustainability and the Avoid-Shift-Improve approach. The paper clearly defines the key elements needed to be taken into account when demonstrating efficiency of port systems. The methodology can be considered suitable in order to support decision making processes of port management entities and local policy makers regarding the assessment of different alternatives in the short and in the long period
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
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
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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