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Energy storage - in the form of UPS units - in a datacenter has been primarily used to fail-over to diesel generators upon power outages. There has been recent interest in using these Energy Storage Devices (ESDs) for demand-response (DR) to either shift peak demand away from high tariff periods, or to shave demand allowing aggressive under-provisioning of(More)
Datacenters are facing increasing pressure to cap their carbon footprints at low cost. Recent work has shown the significant environmental benefits of using renewable energy for datacenters by supply-following techniques (workload scheduling, geographical load balancing, etc.) However, all such prior work has only considered on-site renewable generation(More)
Power infrastructure contributes to a significant portion of datacenter expenditures. Overbooking this infrastructure for a high percentile of the needs is becoming more attractive than for occasional peaks. There exist several computing knobs to cap the power draw within such under-provisioned capacity. Recently, batteries and other energy storage devices(More)
Android multitasking provides rich features to enhance user experience and offers great flexibility for app developers to promote app personalization. However, the security implication of Android multitasking remains under-investigated. With a systematic study of the complex tasks dynamics, we find design flaws of Android multitasking which make all recent(More)
In its latest comparison of Android Virus Detectors (AVDs), the independent lab AV-TEST reports that they have around 95% malware detection rate. This only indicates that current AVDs on Android have good malware signature databases. When the AVDs are deployed on the fast-evolving mobile system, their effectiveness should also be measured on their runtime(More)
Software plagiarism in Android markets (app repackaging) is raising serious concerns about the health of the Android ecosystem. Existing app repackaging detection techniques fall short in detection efficiency and in resilience to circumventing attacks; this allows repackaged apps to be widely propagated and causes extensive damages before being detected. To(More)
Peak power management of datacenters has tremendous cost implications. While numerous mechanisms have been proposed to cap power consumption, real datacenter power consumption data is scarce. To address this gap, we collect power demands at multiple spatial and fine-grained temporal resolutions from the load of geo-distributed datacenters of Microsoft over(More)
—Peak power management of datacenters has tremendous cost implications. While numerous mechanisms have been proposed to cap power consumption, real datacenter power consumption data is scarce. Prior studies have either used a small set of applications and/or servers, or presented data that is at an aggregate scale from which it is difficult to design and(More)
By 2014, the number of Android users has grown to 1.1 billion and the number of Android devices has reached 1.9 billion [1]. At the same time, enterprises are also embracing Android based Bring Your Own Device (BYOD) solutions. For example, in Intel’s BYOD program, there are over 20,000 Android devices across over 800 combinations of Android versions and(More)
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