Learn More
P2P-TV systems performance are driven by the overlay topology that peers form. Several proposals have been made in the past to optimize it, yet little experimental studies have corroborated results. The aim of this work is to provide a comprehensive experimental comparison of different strategies for the construction and maintenance of the overlay topology(More)
Unstructured, chunk-based P2P streaming (TV and Video) systems are becoming popular and are subject of intense research. Chunk and peer selection strategies (or scheduling) are among the main driver of performance. This work presents the formal proof that there exist a distributed scheduling strategy which is able to distribute every chunk to all N peers in(More)
Traffic Flow Confidentiality (TFC) mechanisms are techniques devised to hide/masquerade the traffic pattern to prevent statistical traffic analysis attacks. Their inclusion in widespread security protocols, in conjunction with the ability for deployers to flexibly control their operation, might boost their adoption and improve privacy of future networks.(More)
—Splitting a P2P video distribution in multiple media flows with different priorities is an interesting approach for developing flexible and adaptive streaming systems, ranging from VoD to TV. Such an approach can both yield satisfactory quality to all end users and be light in network resources usage, because low-priority flows can be discarded a-priori(More)
—P2P TV and video streaming are among the most bandwidth-hungry applications running over the Internet. One of the main reasons is that the scheduling of information transfer between peers is extremely aggressive and does not take network characteristics into account. Moreover, schedulers are not designed to be robust and configurable, so that their(More)
In the present study the effects of somatostatin and cysteamine (a selective decreaser of the somatostatin level in the body) were compared in different behavioral tests on rats. Somatostatin inhibited the extinction of active avoidance behavior 8 hr and 24 hr after intracerebroventricular (ICV) treatment, while cysteamine facilitated it 4 hr and 8 hr after(More)
BACKGROUND The aim of our prospective multicenter Clopidogrel Registry was to evaluate the efficacy and safety of a 300-mg loading dose of clopidogrel at the time of ad hoc stenting in patients with suspected coronary artery disease who were not pretreated with clopidogrel for any reason, and to compare the 30-day clinical event rates with the outcome of(More)
The impact of obesity on nitric oxide (NO)-mediated coronary microvascular responses is poorly understood. Thus NO-mediated vasomotor responses were investigated in pressurized coronary arterioles ( approximately 100 microm) isolated from lean (on normal diet) and obese (fed with 60% of saturated fat) rats. We found that dilations to acetylcholine (ACh)(More)
This paper describes SSSim, the Simple and Scalable Simulator for P2P streaming systems. SSSim is designed for performance and scalability, and allows the simulation of the diffusion of a very large number of chunks over large number of peers in reasonable times. This result has been obtained by optimising the simulator for recurrent workloads and(More)