23,582 research outputs found

    Energy consumption analysis of the Venus Deep Space Station (DSS-13)

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    This report continues the energy consumption analysis and verification study of the tracking stations of the Goldstone Deep Space Communications Complex, and presents an audit of the Venus Deep Space Station (DSS 13). Due to the non-continuous radioastronomy research and development operations at the station, estimations of energy usage were employed in the energy consumption simulation of both the 9-meter and 26-meter antenna buildings. A 17.9% decrease in station energy consumption was experienced over the 1979-1981 years under study. A comparison of the ECP computer simulations and the station's main watt-hour meter readings showed good agreement

    Fault Testing for Reversible Circuits

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    Applications of reversible circuits can be found in the fields of low-power computation, cryptography, communications, digital signal processing, and the emerging field of quantum computation. Furthermore, prototype circuits for low-power applications are already being fabricated in CMOS. Regardless of the eventual technology adopted, testing is sure to be an important component in any robust implementation. We consider the test set generation problem. Reversibility affects the testing problem in fundamental ways, making it significantly simpler than for the irreversible case. For example, we show that any test set that detects all single stuck-at faults in a reversible circuit also detects all multiple stuck-at faults. We present efficient test set constructions for the standard stuck-at fault model as well as the usually intractable cell-fault model. We also give a practical test set generation algorithm, based on an integer linear programming formulation, that yields test sets approximately half the size of those produced by conventional ATPG.Comment: 30 pages, 8 figures. to appear in IEEE Trans. on CA

    Civic perceptions: housing and local decision-making in English cities in the 1920s

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    The adoption of non-traditional housing by local authorities is customarily explained in terms of economic factor shortages or a nationally determined policy discourse. This underestimates the significance of distinctly local understandings of civic responsibility. Based on Leicester and Nottingham, this article argues that those influences frequently used to predict outcomes – like party political allegiance – mattered less in decision-making than a city's intrinsic view of itself. Such perceptions were grounded in subtle constructions of civic community, perceived need and political reinterpretation. Particularly important was the role of the local press. Even cities with similar problems, therefore, could be represented, and subsequently see themselves, in very dissimilar terms and act accordingly
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