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Since the electricity bill of a data center constitutes a significant portion of its overall operational costs, reducing this has become important. We investigate cost reduction opportunities that arise by the use of uninterrupted power supply (UPS) units as energy storage devices. This represents a deviation from the usual use of these devices as mere transitional fail-over mechanisms between utility and captive sources such as diesel generators. We consider the problem of opportunistically using these devices to reduce the time average electric utility bill in a data center. Using the technique of Lyapunov optimization, we develop an online control algorithm that can optimally exploit these devices to minimize the time average cost. This algorithm operates without any knowledge of the statistics of the workload or electricity cost processes, making it attractive in the presence of workload and pricing uncertainties. An interesting feature of our algorithm is that its deviation from optimality reduces as the storage capacity is increased. Our work opens up a new area in data center power management.
Older American adults are at an increased risk of becoming a victim of financial fraud or exploitation and criminals don't want you to know it. An estimated $36 billion is lost to these con artists each year. They gain the trust of our loved ones and use it against them in ways that leave victims emotionally and financially devastated.
According to the OSHA regulations, a confined space is anyplace that meets the following criteria: (1) Is large enough and so configured that an employee can bodily enter and perform assigned work; and (2) Has limited or restricted means for entry or exit; and (3) Is not designed for continuous employee occupancy.
Emerging energy-aware initiatives (such as billing of power usage based on de-coupling between electricity sales and utility profits/fixed-cost recovery) render current capacity planning practices based on heavy over-provisioning of power infrastructure unprofitable for data centers. We explore a combination of statistical multiplexing techniques (including controlled under-provisioning and overbooking) to improve the utilization of the power hierarchy in a data center. Our techniques are built upon a measurement-driven profiling and prediction technique to characterize key statistical properties of the power needs of hosted workloads and their aggregates. As a representative result from our evaluation on a prototype data center, by accurately identifying the worst-case needs of hosted workloads, our technique is able to safely operate 2.5 times as many servers running copies of the e-commerce benchmark TPC-W as allowed by the prevalent practice of using face-plate ratings. Exploiting statistical multiplexing among the power usage of these servers along with controlled under-provisioning by 10% based on tails of power profiles offers a further gain of 100% over face-plate provisioning. Reactive techniques implemented in the Xen VMM running on our servers dynamically modulate CPU DVFS-states to ensure power draw below safe limits despite aggressive provisioning. Finally, information captured in our profiles also provides ways of controlling application performance degradation despite the above under-provisioning: the 95th percentile of TPC-W session response time only grew from 1.59 sec to 1.78 sec.
One of the new terms in the data center industry is Edge Data Centers. What is the Edge? Where is the Edge? Before we begin to understand what an Edge Data Center is, it might be helpful to first understand what it is not.
US, China, Japan and Korea are seizing global leadership in 5G with support of coherent and helpful industrial policies in those nations across the entire mobile ecosystem including technology development, spectrum licensing, site acquisition and operator consolidation. All these nations will launch 3GPP standard-compliant 5G services in 1Q 2019, except for the US, that might start sooner, and Japan, where the first launches are expected before yearend 2019. The first 5G smartphones will probably be sold to consumers to be sold to consumers in 2Q 2019.
Knowing how cranes should be used, and how they should not be used, is critical to crane safety. Overload, side pull, limit switches, secondary braking devices, using the reverse direction for speed control, and daily inspections are surrounded by myth and mystery in the workplace.
This is the first blog in a series on integrating new technologies into the process of forensic investigations. Documenting the scene of an incident accurately, efficiently, and safely is a key step in every investigation. Busy roadways and unstable structures present hazards to the investigator during the investigation process. The use of remote sensors can reduce these risks and provide data that otherwise could not safely be obtained.
As with most things, the ADA requirement to make all new motorcoaches purchased after 2001 wheelchair-accessible, and the 2015 ruling to install three-point occupant restraint systems, introduced an entirely new spectrum of safety, liability and social concerns to the motorcoach industry. But a couple of responses to these requirements, particularly by one OEM and one supplier, have opened up a whole new set of opportunities for savvy motorcoach operators.