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Schools do n't exist in a vacuum , and during a disaster , they may be looked upon as a vital recovery element by the community . In this case , the investigator should record that the defendant said he was somewhere else when the crime occurred , and that it was necessary to spend three hours checking out the alibi only to discover that it was untrue . For our preliminary implementation , however , we wish to find a simple heuristic that does well in the expected case and not very badly in the worst case , and that requires a minimum of bookkeeping and computational overhead . It is clear from the literature of trace-based studies that there are many interesting and important workloads to consider when designing a file system , and that new workloads emerge as new applications and uses for file systems appear . Skills in topic selection , research design , and theory construction are emphasized . By using a slow client and a fast server on a congested network , we have been able to create systems that reorder more than 10 % of their requests for long periods of time , and during our analysis of traces from production systems we have seen similar percentages during periods of peak traffic . Relief efforts might be able to use your volunteer help , and that of your teenage children . Performed are the basis of decision of a maintenance plan for road preservation , vegetation recovery and pervasion prevention , training of safari drivers , and technical instruction to road administrator . This chapter reviews a hierarchy of LP formulations of the combinatorial allocation problem , reviews tractable special cases , and introduces a primal-dual algorithm for the problem with a natural interpretation as an ascending-price auction . We believe that as the community of computer users has expanded and evolved there has been a fundamental change in the workloads seen by file servers , and that the research community must find ways to observe and measure these new workloads .