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Bigtable is a distributed storage system for managing structured data that is designed to scale to a very large size: petabytes of data across thousands of commodity servers. Many projects at Google store data in Bigtable, including web indexing, Google Earth, and Google Finance. These applications place very different demands on Bigtable, both in terms of(More)
We present an in-kernel disk prefetcher which uses speculative execution to determine what data an application is likely to require in the near future. By placing our design within the operating system, we provide several benefits compared to the previous application-level design. Not only is our system easier to implement and deploy, but by handling page(More)
Energy is a critical resource in many computing systems, motivating the need for energy-efficient software design. This work proposes a new approach, energy-driven statistical sampling, to help software developers reason about the energy impact of software design decisions. We describe a prototype implementation of this approach built on the Itsy pocket(More)
As part of Healthy People 2010, a national consensus panel identified 21 Healthy People 2010 objectives as critical to adolescent and young adult health. These objectives span six areas: mortality, unintentional injury, violence, mental health and substance use, reproductive health, and the prevention of chronic disease during adulthood. Progress on these(More)
Quantifiability is a concept in MapReduce Analytics based on the following two conditions: (a) a mapper should be cautious, that is, should not exclude any reducer's shuffle and sort strategy from consideration; and (b) a mapper should respect the reducers' shuffle and sort preferences, that is, should deem a reducer's shuffle and sort(More)
PURPOSE To examine parental acceptability of contraceptive methods offered confidentially to their adolescent daughter. METHODS A random sample of 261 parents/guardians with a daughter aged 12-17 years completed a telephone survey examining the relationship between parental acceptability of seven contraceptive methods and adolescents' likelihood to have(More)
OBJECTIVES To explore the knowledge and attitudes that Latino parents have about confidential health services for their teens and to identify factors that may influence those attitudes. METHODS Latino parents of teens (12-17 years) were randomly selected from a large health maintenance organization and a community-based hospital to participate in 1-hour(More)
Cloud Computing is a point of attraction and got a lot of attention because of the numerous abilities it offers. On the other hand spatial-data is vital and considered to be a global important aspect. The security challenges it poses online is significant. The cloud computing security solution is used to avoid all the risks or the potential vulnerabilities(More)