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P2P applications are rapidly gaining acceptance among users of Internet-based services, especially because of their capability of exchanging resources while preserving the anonymity of both requestors and providers. However, concerns have been raised about the possibility that malicious users can exploit the network to spread tampered-with resources (e.g.,… (More)

- Roberto Aringhieri, Roberto Cordone
- JORS
- 2011

TheMaximum Diversity Problem (MDP) requires to extract a subsetM of given cardinality from a set N, maximising the sum of the pair-wise diversities between the extracted elements. The MDP has recently been the subject of much research, and several sophisticated heuristics have been proposed to solve it. The present work compares four local search… (More)

- Roberto Aringhieri, Mauro Dell'Amico
- J. Heuristics
- 2005

- Roberto Aringhieri
- WEA
- 2004

- Roberto Aringhieri, Federico Malucelli
- Annals OR
- 2003

District heating plants are becoming more common in European cities, especially in the northern countries. These systems make it possible to furnish users with warm water while locating the production plants in the outskirts. This has the double benefit of lowering the impact of pollution on the center of the city and achieving better conversion… (More)

Description: The Maximum Diversity Problem consists in determining a subset M of given cardinality from a set N of elements, in such a way that the sum of the pairwise differences between the elements of M is maximum. This problem, introduced by Glover, Hersh andMcMillian, has been deeply studied using the GRASP methodology. GRASPs are often characterized… (More)

- Roberto Aringhieri, Maurizio Bruglieri, Federico Malucelli, Maddalena Nonato
- Electronic Notes in Discrete Mathematics
- 2004

In the chemical community the need for representing chemical structures within a given family and of efficiently enumerating these structures suggested the use of computers and the implementation of fast enumeration algorithms. This paper considers the isomeric acyclic structures focusing on the enumeration of the alkane molecular family. For this family,… (More)

Solution of real world problems have to deal with some uncertainties. This is particularly true for the planning of services whose requests are unknown a priori. Several approaches for solving stochastic problems are reported in the literature. Metaheuristics seem to be a powerful tool for computing good and robust solutions. However, the efficiency of… (More)

- Roberto Aringhieri, Roberto Cordone, Andrea Grosso
- European Journal of Operational Research
- 2015

Given a set N, a pairwise distance function d and an integer number m, the Dispersion Problems (DPs) require to extract from N a subset M of cardinality m, so as to optimize a suitable function of the distances between the elements in M. Different functions give rise to a whole family of combinatorial optimization problems. In particular, the max-sum DP and… (More)