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1,507 results on '"Marino R."'

1. Flower Roundabouts And Double-Lane Roundabouts: A Comparative Performance Analysis

Author

Giuffrè O., Granà A., Giuffrè T., Marino R., and Marino S.

Subjects
double-lane roundabout, flower roundabout, entry capacity, delay, Engineering (General). Civil engineering (General), TA1-2040
Abstract

In the paper, a choice criterion between flower roundabouts and double-lane roundabouts is proposed, focusing on operational benefits that can derive from one scheme over the other, and outlining a general framework for benefit-cost analysis. In order to assess operational benefits of innovative roundabouts over modern roundabouts, a comparative analysis was made. Capacity was estimated using gap-acceptance models. In detail, assuming the dichotomic shifted negative exponential distribution to model headways in circulating streams, the Hagring formula was adjusted to obtain entry capacity estimations at roundabout approaches where entering vehicles face one or two conflicting flows. Based on the control delay, the suitability domains and indifference areas were constructed. Thus, a sensitivity analysis to changes in traffic demand for operational benefits of flower roundabouts over double-lane roundabouts was carried out and discussed. At last, evidence for new installations and conversion of existing roundabouts can be found.

Published
2014
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2. Estimating the Safety Performance Function for Urban Unsignalized Four-Legged One-Way Intersections in Palermo, Italy

Author

Giuffrè O., Granà A., Giuffrè T., Marino R., and Marino S.

Subjects
safety performance functions, urban intersection, overdispersion, correlation, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Starting from consideration that urban intersections are sites with promise for safety and operational improvements, the paper describes the steps taken to develop a crash predictive model for estimating the safety performance of urban unsignalized intersections located in Palermo, Italy. The focus is on unsignalized four-legged one-way intersections widespread in Italian downtowns. The sample considered in the study consist of 92 intersections in Palermo, Italy. For the study were collected crashes occurred in the sites during the years 2006-2012, geometric design and functional characteristics and traffic flow. Results showed that data were overdispersed and NB1 distributed. In order to account for the correlation within responses Generalized Estimating Equations (GEE) were used under different working correlation matrices.

Published
2014
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17. Low-dimensional representation of intermittent geophysical turbulence with high-order statistics-informed neural networks (H-SiNN).

Author

Foldes, R., Camporeale, E., and Marino, R.

Subjects
NAVIER-Stokes equations, TURBULENCE, TURBULENT flow, BOUSSINESQ equations, MACHINE learning, STRATIFIED flow
Abstract

We present a novel machine learning approach to reduce the dimensionality of state variables in stratified turbulent flows governed by the Navier–Stokes equations in the Boussinesq approximation. The aim of the new method is to perform an accurate reconstruction of the temperature and the three-dimensional velocity of geophysical turbulent flows developing non-homogeneities, starting from a low-dimensional representation in latent space, yet conserving important information about non-Gaussian structures captured by high-order moments of distributions. To achieve this goal, we modify the standard convolutional autoencoder (CAE) by implementing a customized loss function that enforces the accuracy of the reconstructed high-order statistical moments. We present results for compression coefficients up to 16, demonstrating how the proposed method is more efficient than a standard CAE in performing dimensionality reduction of simulations of stratified geophysical flows characterized by intermittent phenomena, as observed in the atmosphere and the oceans. [ABSTRACT FROM AUTHOR]

Published
2024
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19. Nearly all the sky is covered by Lyman-α emission around high-redshift galaxies

Author

Wisotzki, L., Bacon, R., Brinchmann, J., Cantalupo, S., Richter, P., Schaye, J., Schmidt, K. B., Urrutia, T., Weilbacher, P. M., Akhlaghi, M., Bouché, N., Contini, T., Guiderdoni, B., Herenz, E. C., Inami, H., Kerutt, J., Leclercq, F., Marino, R. A., Maseda, M., Monreal-Ibero, A., Nanayakkara, T., Richard, J., Saust, R., Steinmetz, M., and Wendt, M.

Published
2018
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