Giovanni Di Stasi

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We present Vsys, a mechanism for restricting access to privileged operations, much like the popular sudo tool on UNIX. Unlike sudo, Vsys allows privileges to be constrained using general-purpose programming languages and facilitates composing multiple system services into powerful abstractions for isolation. In use for over three years on PlanetLab, Vsys(More)
To tackle an inherent security weakness of wireless environments, we propose the implementation of a reputation procedure onto the routing protocol Ad-hoc On Demand Vector routing (AODV). This procedure relies on the overal cooperation of nodes taking part to the Wireless Mesh Network. Each node associates a reputation value to its neighbours, which(More)
Routing in multi-radio wireless mesh networks is a very challenging problem. In this paper, we propose a forwarding paradigm based on MPLS (Multi Protocol Label Switching) which makes use of a novel mechanism, denoted as MPLS splitting policy. Such mechanism allows to configure multiple next hops at an intermediate node, so that the incoming traffic is(More)
Wireless mesh networks (WMNs) based on the IEEE 802.11 standard are becoming increasingly popular as a viable alternative to wired networks. WMNs can cover large or difficult to reach areas with low deployment and management costs. Several multi-path routing algorithms have been proposed for such kind of networks with the objective of load balancing the(More)
In multi-radio wireless mesh networks, a network device simultaneously transmits packets over different channels by using multiple radios. Such frequency diversity not only increases throughput but makes multi-path routing approaches extremely interesting. This is because the channel diversity reduces the risk for intraand inter-flow interference. A(More)
This study was aimed at stressing the role of US of the first dorsal compartment of the wrist as the initial diagnostic approach in the study of De Quervain's syndrome, thanks to the high diagnostic yield of this technique. We report on 14 cases of De Quervain's stenosing tenosynovitis whose onset of the symptoms ranged 3-24 months before the US exam. The(More)
The authors have studied 5 patients with syringocele--or cystic dilatation of the excretory ducts in Cowper's glands--using a 7.5 MHz linear high-definition US probe. The urethra was distended with a saline solution introduced through a small Foley's balloon catheter placed in the navicular fossa. Longitudinal and transverse scans were employed at both the(More)
Channel assignment is among the most challenging issues for multiradio wireless mesh networks, given the variety of objectives that can be pursued and the computational complexity of the resulting problems. The channel assignment problem has been also shown to be interdependent with the routing problem, i.e., the problem to determine the amount of traffic(More)