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34 results on '"Calabrese, F"'

2. Scaling behaviors in the communication network between cities

Author

UCL - FSA/INMA - Département d'ingénierie mathématique, Krings, Gautier, Blondel, Vincent, Calabrese, F., Ratti, C., UCL - FSA/INMA - Département d'ingénierie mathématique, Krings, Gautier, Blondel, Vincent, Calabrese, F., and Ratti, C.

Abstract

Researchers have been unable to predict the large-scale features of aggregate social networks. We analyze the anonymous communications patterns of 2.5 million customers of a Belgian mobile phone operator. With these communications, we construct the social network of the customers, that we call microscopic network. Grouping customers together by billing address city, we obtain a social network of cities, which we call the macroscopic network, is built from 571 towns and cities in Belgium. Using the mobile phone network, we are able to show that the macroscopic network has both a degree distribution and edge weight distribution with lognormal characteristics. We find that inter-city communications can be characterized by a gravity model: the intensity of communication between two cities is proportional to the product of the two populations divided by the square of the distance between them. Furthermore, we observe that intra-urban communications scale superlinearly with city population., Anglais

Published
2009

3. AllAboard: Visual Exploration of Cellphone Mobility Data to Optimise Public Transport.

Author

Di Lorenzo, G., Sbodio, M., Calabrese, F., Berlingerio, M., Pinelli, F., and Nair, R.

Subjects
CELL phones, TRANSPORTATION planning, USER interfaces, TELECOMMUNICATION, DATA mining
Abstract

The deep penetration of mobile phones offers cities the ability to opportunistically monitor citizens’ mobility and use data-driven insights to better plan and manage services. With large scale data on mobility patterns, operators can move away from the costly, mostly survey based, transportation planning processes, to a more data-centric view, that places the instrumented user at the center of development. In this framework, using mobile phone data to perform transit analysis and optimization represents a new frontier with significant societal impact, especially in developing countries. In this paper we present AllAboard, an intelligent tool that analyses cellphone data to help city authorities in visually exploring urban mobility and optimizing public transport. This is performed within a self contained tool, as opposed to the current solutions which rely on a combination of several distinct tools for analysis, reporting, optimisation and planning. An interactive user interface allows transit operators to visually explore the travel demand in both space and time, correlate it with the transit network, and evaluate the quality of service that a transit network provides to the citizens at very fine grain. Operators can visually test scenarios for transit network improvements, and compare the expected impact on the travellers’ experience. The system has been tested using real telecommunication data for the city of Abidjan, Ivory Coast, and evaluated from a data mining, optimisation and user prospective. [ABSTRACT FROM PUBLISHER]

Published
2016
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33. Advanced system for sustainable aquaculture plant management

Author

Angelo Corallo, Marco Cataldo, Fabrizio Errico, Francesca Calabrese, Marta Menegoli, Alessandro Antonio Zizzari, Maria Elena Latino, Corallo, A., Errico, F., Latino, M. E., Menegoli, M., Calabrese, F., Cataldo, Marco, and Zizzari, A. A.

Subjects
0106 biological sciences, Sustainable development, food citizenship, Resource (biology), business.industry, 010604 marine biology & hydrobiology, 04 agricultural and veterinary sciences, Environmental economics, 01 natural sciences, Maintenance engineering, Aquaculture, Sustainable aquaculture, Order (exchange), Sustainability, 040102 fisheries, 0401 agriculture, forestry, and fisheries, Production (economics), production planning and control, business, aquaculture innovative and sustainable system
Abstract

Aquaculture is an expansion industry and has the potential to satisfy the worldwide demand of fish production related to the global population growth. Technological and methodological innovations are needed not only to optimize the production but also to assure its sustainability. The paper describes a system to be placed in sea aquaculture plants, in order to improve the enterprise sustainability from environmental, economical and ethical points of view. Several devices compose the system, able to solve practical issues emerged from a case study in south of Italy. At the same time, it is an answer to the concerns about the food sustainability production and the intensity of resource needed, typical of Food Citizenship. The system' devices are described.

Published
2018

34. Finite-time stability analysis of linear discrete-time systems via polyhedral Lyapunov functions

Author

F. Calabrese, Roberto Ambrosino, Francesco Amato, Marco Ariola, Amato, F., Ambrosino, R., Ariola, M., and Calabrese, F.

Subjects
Lyapunov function, Mathematical optimization, State variable, Linear system, Stability (learning theory), Polytope, symbols.namesake, Discrete time and continuous time, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, symbols, Applied mathematics, Lyapunov equation, Electrical and Electronic Engineering, Lyapunov redesign, Mathematics
Abstract

In this paper we consider the finite-time stability problem for discrete-time linear systems. Differently from previous papers, the stability analysis is performed with the aid of polyhedral Lyapunov functions rather than using the classical quadratic Lyapunov functions. In this way we are able to deal with more realistic constraints on the state variables; indeed, in a way which is naturally compatible with polyhedral functions, we assume that the sets to which the state variables must belong to in order to satisfy the finite-time stability requirement are boxes (or more in general polytopes) rather than ellipsoids. The main result, derived by using polyhedral Lyapunov functions, is a sufficient condition for finite-time stability of discrete-time linear systems. Some examples are presented to illustrate the advantages of the proposed methodology over existing methods.

Published
2008

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