OBJECTIVE To compare information about traffic crash injuries and kilometers driven reported in a written questionnaire with information reported in a telephone interview. DESIGN Telephone and paper surveys. SETTING The Seguimiento Universidad de Navarra (SUN, University of Navarra Follow-up) study, in Spain. The SUN study is an open enrollment cohort study with 17 000 enrolled graduates fo...

In this paper we study the energy-aware cooperative management of the cellular access networks of the operators that offer service over the same area. In particular, we evaluate the amount of energy that can be saved by using all networks in high traffic conditions, but progressively switching off networks during the periods when traffic decreases, and eventually becomes so low that the desired...

Operating networks depends on collecting and analyzing measurement data. Current technologies do not make it easy to do so, typically because they separate data collection (e.g., packet capture or flow monitoring) from analysis, producing either too much data to answer a general question, or too little data to answer a detailed question. In this paper, we present Sonata, a network telemetry sys...

In recent years, there are growing interests to provide telephone services over the Internet. In particular, Internet Services Providers (ISPs) may become the next generation telephone company especially in providing international telephone services. This paper proposes a novel method called quantum IP (QIP) for transporting international voice traffic over the Internet via QIP routers. Emulati...

Recently, it has been found that the degree distribution of a user network has a significant effect on the traffic carried by a telephone network. In this paper, we investigate the effect of user clustering on the telephone traffic based on computer simulations. Both uniform and scale-free user networks have been considered. In a uniform user network, it has been found that the carried traffic ...

This paper covers access network performance analysis by deploying ATM over ADSL within Telecom Italia experimental department “EXANET” (Experimental ATM Network). In this scenario, data traffic leaves customer site as ATM traffic running over ADSL modem links, gets aggregated via DSLAM (DSL Access Multiplexer) at the central office (CO) and then dropped onto the high-speed ATM switching fabric...