1,722,704 research outputs found
To what extent is the new position statement of the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD) 'personalised'?
No full textComment in
ADA/EASD position statement of the treatment of type 2 diabetes: Reply to Rodbard HW and Jellinger PS [letter], Scheen AJ [letter] and Ceriello A, Gallo M, Gentile S et al [letter]. [Diabetologia. 2012
An Ant Colony Optimisation (ACO) algorithm for solving the Local Optimisation of Signal Settings (LOSS) problem on real-scale networks
No full textIn this paper we propose an Ant Colony Optimisation (ACO) algorithm for optimising the signal settings on urban networks following a local approach. This problem, also known as LOSS (Local Optimisation of Signal Settings), has been widely studied in the literature and can be formulated as an asymmetric assignment problem (Cascetta, E., Gallo, M. and B. Montella, 2006. Models and algorithms for the optimization of signal setting on urban networks with stochastic assignment models. Ann. Oper. Res., 144, 301-328). The problem consists in optimising the signal settings of each intersection of an urban network as a function only of traffic flows at the accesses to the same intersection, taking account of the effects of signal settings on costs and on user route choices.
The proposed ACO algorithm is based on two kinds of behaviour of artificial ants which allow the LOSS problem to be solved: traditional behaviour based on the response to pheromones for simulating user route choice, and innovative behaviour based on the pressure of an ant stream for solving the signal setting definition problem. Our results on a real-scale network show that the proposed approach allows the solution to be obtained in less time but with the same accuracy as in traditional MSA approaches
Il Sistema Universitario Campano tra Miti e Realtà: Aspetti Metodologici, Analisi e Risultati
No full textA fixed-point model and solution algorithms for simulating urban freight distribution in a multimodal context
No full textUrban road networks are generally shared by cars, buses and freight vehicles whose travel times are reciprocally affected (the crossed congestion phenomenon). Hence, simulating performances of urban road networks requires the development of a multimodal assignment model that takes into account the effects of reciprocal influences among vehicles on user travel choices. In this paper, we extend the model proposed in a previous paper (D'Acierno L., Montella B. and Gallo M., 2002, Multimodal assignment to congested networks: fixed-point models and algorithms. Proceedings of the European Transport Conference 2002, Cambridge, United Kingdom) to the case of urban freight distribution simulation, considering crossed congestion among all considered transportation systems. The proposed model is tested on a real dimension network, adopting three algorithmic approaches (external, internal and hyper-network) for its solution and comparing their performances in terms of computing times and result reliability. Finally, we discuss the effects of crossed congestion on freight path choices and the influences of freight vehicle presence on (road and transit) user choices
Multiplicity and concentration results for local and fractional NLS equations with critical growth
Full text linkGoal of this paper is to study the following singularly perturbed nonlinear Schrödinger equation: eps^2s (-Delta)^s v + V(x)v = f(v), x in R^N, where s is in (0,1), N is greater or equal to 2, V in C(R^N,R) is a positive potential and f is assumed critical and satisfying general Berestycki-Lions type conditions. When eps is greater than 0 is small, we obtain existence and multiplicity of semiclassical solutions, relating the number of solutions to the cup-length of a set of local minima of V; in particular, we improve the result in [37]. Furthermore, these solutions are proved to concentrate in the potential well, exhibiting a polynomial decay. Finally, we prove the previous results also in the limiting local setting s = 1 and N greater or equal to 3, with an exponential decay of the solutions
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
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