منابع مشابه
Prescribing Fire in Eastern Oak Forests: Is Time Running Out?
Before European settlement, vast areas of the eastern US deciduous forest were dominated by oak species. Evidence indicates that periodic understory fire was an important ecological factor in the historical development of oak forests. During European settlement of the late 19th and early 20th century, much of the eastern United States was impacted by land-clearing, extensive timber harvesting, ...
متن کاملGrid Timestamps: The Leap Second Problem
It has been observed that there is potential for multi-second errors in the interpretation of Grid timestamps. Here we examine these issues and explore possible solutions.
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A professor forced into retirement by a severe disability finds his personal care assistants essential. But he may not be able to afford their help much longer—and he faces going on Medicaid and possibly becoming institutionalized. Chronic Care Disability Multiple Sclerosis Personal Care Assistant Long-Term Care It’s 9:28 p.m. Serge punches the code into the digital lock and enters my front doo...
متن کاملThe Leap Second Behaviour of NTP Servers
The NTP network is an important part of the Internet’s infrastructure, and one of the most challenging times for the NTP network is around leap seconds. In this paper we look at the behaviour of public servers in the NTP network in 2005 and over the period from 2008 to present, focusing on leap seconds. We review the evolution of the NTP reference implementation with respect to leap seconds and...
متن کاملNetwork Timing and the 2015 Leap Second
Using a testbed with reference timestamping, we collected timing data from public Stratum-1 NTP servers during the leap second event of end-June 2015. We found a wide variety of anomalous serverside behaviors, both at the NTP protocol level and in the server clocks themselves, which can last days or even weeks after the event. Out of 176 servers, only 61% had no erroneous behavior related to th...
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ژورنال
عنوان ژورنال: Nature
سال: 2011
ISSN: 0028-0836,1476-4687
DOI: 10.1038/479158a