In this paper, we study admission control problems of P2P-based Media Delivery Network (P2P-based MDN). We propose a specific partially observable Markov Decision Process (POMDP) model for P2P-based MDN. Based on this model, the observationbased randomized policy for admission control is provided, which optimizes system’s performance by applying policy-gradient algorithm. Observation-based poli...

Recent technological advances in computer, high-speed network, and data compression are accelerating the realization of media-on-demand (MOD) systems. In this paper, we investigate issues involved in the design of a distributed server to support MOD application. We describe Eager Pipelining Policy which utilizes resources, that are otherwise unused, to improve system performance. Eager Pipelini...

BACKGROUND We conducted a print media analysis in 44 countries in Africa, the Americas, Asia, and the Eastern Mediterranean in order to understand one dimension of the climate for evidence-informed health systems and to provide a baseline for an evaluation of knowledge-translation platforms. Our focus was whether and how policymakers, stakeholders, and researchers talk in the media about three ...

MEMS-based storage devices should be energy efficient for deployment in mobile systems. Since MEMS-based storage devices have a moving media sled, they should be shut down during periods of inactivity. However, shutdown costs energy, limiting the applicability of aggressive shutdown decisions. The media sled in MEMS-based storage devices is suspended by springs. We introduce a policy that explo...

We present a formal language for specifying distributed authorization policies that communicate through insecure asynchronous media. The language allows us to write declarative authorization policies; the interface between policy decisions and communication events can be specified using guards and policy updates. The attacker, who controls the communication media, is modeled as a message deduct...

In a representative system of government, policy outcomes are affected by the political preferences and the beliefs of the voters. The media play a key role in shaping these preferences and beliefs. They collect, summarize, and frame the information that voters use in their voting decisions. As a result, many have expressed concern that the media may be able to systematically manipulate politic...

The concept and phenomenon of media innovation is gaining some attention in the academic community, policy circles and among practitioners. However, the phenomenon is still poorly defined and not well understood. This paper therefore first analyses how media innovation is framed in the literature on media economics and media management. Then it considers to what extent the standard analysis of ...

BACKGROUND Cannabis use and cannabis regulatory policies recently re-surfaced as noteworthy global research and social media topics, including claims that Mexicans have been sending cannabis and other drug supplies through a porous border into the United States. These circumstances prompted us to conduct an epidemiological test of whether the states bordering Mexico had exceptionally large cann...