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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)
The Maximum Diversity Problem (MDP) consists in determining a subset M of given cardinality from a set of elements N , in such a way that the sum of the pairwise distances between the elements of M is maximum. This problem, introduced by Glover [6], has been deeply studied using GRASP methodologies [5, 1, 13, 2]. GRASP is often characterized by a strong(More)
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)