1,061 research outputs found

    Chapter 9: Evidence

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    The multidriver: A reliable multicast service using the Xpress Transfer Protocol

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    A reliable multicast facility extends traditional point-to-point virtual circuit reliability to one-to-many communication. Such services can provide more efficient use of network resources, a powerful distributed name binding capability, and reduced latency in multidestination message delivery. These benefits will be especially valuable in real-time environments where reliable multicast can enable new applications and increase the availability and the reliability of data and services. We present a unique multicast service that exploits features in the next-generation, real-time transfer layer protocol, the Xpress Transfer Protocol (XTP). In its reliable mode, the service offers error, flow, and rate-controlled multidestination delivery of arbitrary-sized messages, with provision for the coordination of reliable reverse channels. Performance measurements on a single-segment Proteon ProNET-4 4 Mbps 802.5 token ring with heterogeneous nodes are discussed

    Estimating the Undercoverage of a Sampling Frame due to Reporting Delays

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    One of the imperfections of a sampling frame is miscoverage caused by delays in recording real- life events that change the eligibility of population units. For example, new units generally appear on the frame some time after they came into existence and units that have ceased to exist are not removed from the frame immediately. We provide methodology for predicting the undercoverage due to delays in reporting new units. The approach presented here is novel in a business survey context, and is equally applicable to overcoverage due to delays in reporting the closure of units. As a special case, we also predict the number of new-born units per month. The methodology is applied to the principal business register in the UK, maintained by the Office for National Statistics. <br/

    Animal Behavior: Who Will Croak Next?

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    A recent study with the predatory bat Trachops cirrhosus has shown the importance for this species of social learning about novel prey using auditory, rather than visual or olfactory, cues

    Reply: There are limits to autonomy.

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    Soil resources of phosphorus

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    This article continues a series that provides producers with information to aid in phosphorus (P) management and in understanding environmental issues related to P management. This article focuses on the presence and behavior of P in the soil. The nature, amount, distribution, and chemical composition of P compounds in soil are closely related to the classic factors of soil formation--climate, organisms, parent material, topography, and time. Because we have tilled, fertilized, drained, and allowed soils to erode, the form and amount of P in the surface horizon has changed

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