Alessandro Valenti

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This paper focuses on the energy consumption minimization problem of an optical transport network extending over a very wide area. In particular, the specific problem of power-aware routing and wavelength assignment (PA-RWA) is addressed considering a transparent multi-fiber optical network. An integer linear programming formulation is provided for the(More)
This paper proposes a novel power-aware routing and wavelength assignment (PA-RWA) algorithm to be applied to a transparent wavelength division multiplexing (WDM) optical network. The proposed algorithm aims at improving the energy efficiency of the optical network by leaving unused optical fibres as much as possible in order to minimize the number of(More)
The present paper deals with energy saving in IP networks and proposes a distributed energy-aware traffic engineering solution, named DAISIES, for switching off network links according to traffic variations. DAISIES works in a connectionoriented network, e.g. an IP/MPLS network, and follows a routing-based approach, i.e. it acts on the routing algorithm(More)
In this work, we illustrate our experiences on activities about monitoring of the User Quality of Services (QoS) measurement campaigns. We show the network architecture that has been implemented to achieve QoS tests on all Italian users. Such a network permits to achieve a detailed investigation on the network causes that induce performance degradation and,(More)
As the Internet expands in terms of users and exchanged traffic, its energy consumption is becoming a very important issue; in particular, the energy consumption of core networks is expected to be the most critical aspect in coming years. Different strategies and many solutions have been proposed in the last years to improve the energy efficiency of core(More)
In this work we show how to manage the integration between wireless and wired networks. In particular, as wireless technology LTE (Long Term Evolution) was chosen for its characteristics of bandwidth, point-to-multipoint, nomadic and mobile characteristics. We show how to extend the wired network performances, in terms of bandwidth and QoS, to the wireless(More)
As the data traffic grows in IP networks, some adjustments are needed for making networks suitable for such kind of applications. In particular, packet switching and optical technologies in every network section will improve efficiency and bandwidth availability. Moreover, video applications are going to be predominant with respect to other ones, and IP(More)
OBJECTIVES This retrospective study evaluated the clinical performance and long-term survival of glass-ceramic lithium disilicate all-ceramic restorations in anterior and posterior areas over a 10-year period. METHOD AND MATERIALS Following a consistent protocol over 10 years, 261 lithium disilicate crowns (IPS Empress 2, Ivoclar Vivadent), including 101(More)
PURPOSE To evaluate the clinical performance of lithium disilicate (LiDiSi) crowns with a feather-edge finish line margin over a 9-year period. MATERIALS AND METHODS In total, 110 lithium disilicate crowns, 40 anterior (36.3%) and 70 posterior (63.7%), were cemented with resin cement after fluoridric acid and silane surface treatment and observed by a(More)