3,175 research outputs found

    A neural network version of the measure correlate predict algorithm for estimating wind energy yield.

    Get PDF
    A neural network version of the measure correlate predict algorithm for estimating wind energy yiel

    Context Aware Routing Management Architecture for Airborne Networks

    Get PDF
    Military environments require highly dynamic mobile ad hoc networks (MANETs) to meet operational mission requirements. Decision makers rely on the timely delivery of critical battlefield information to make informed determinations quickly and as accurately as possible. However, traditional MANET routing protocols do not provide quality of service (QoS). Furthermore, they do not implement active controls to minimise the impact of network congestion. This study proposes the use of the information embedded in an air tasking order (ATO) during the planning phase of military missions to optimise the network performance. The trajectories of relevant nodes (airborne platforms) participating in the MANET can be forecasted by parsing key information contained in the ATO. Using this idea it is possible to optimise network routes to minimise edge overutilisation and increase network throughput. In onesimulated test case, there was a 25% improvement of network throughput, and 23% reduction on dropped packets. Using this technique, the authors can selectively preserve the QoS by establishing network controls that drop low-priority packets when necessary. The algorithm improves the overall MANET throughput while minimising the packets dropped due to network congestion

    Lung content analysis of cases occupationally exposed to chrysotile asbestos.

    Get PDF
    The lung contents of six workers who had been occupationally exposed to chrysotile asbestos were examined. Five were lung cancer cases from Quebec, Canada. The sixth, an American worker who had developed pleural mesothelioma, was particularly interesting, with the lung content strikingly distinct from the Canadian cases; chrysotile, the predominant fiber in his lung, was present at a concentration 300 times that of the average total fiber content in the Canadian cases. The fiber length distribution of the chrysotile recovered from the U.S. mesothelioma case was indistinguishable from that of chrysotile specimens known to produce mesotheliomas in rats. It was also found that the characteristics of the calcium-magnesium-iron silicate fibers present in all six cases were not readily comparable to tremolite asbestos specimens known to induce mesotheliomas in animals

    Aid to conflict-affected countries : lessons for donors

    Full text link
    The first section looks at the implications of conflict for aid effectiveness and selectivity. We argue that, while aid is generally effective in promoting growth and by implication reducing poverty, it is more effective in promoting growth in post-conflict countries. We then consider the implications of these findings for donor selectivity models and for assessment of donor performance in allocating development aid among recipient countries. We argue that, while further research on aid effectiveness in post-conflict scenarios is needed, existing selectivity models should be augmented with, inter alia, post-conflict variables, and donors should be evaluated on the basis, inter alia, of the share of their aid budgets allocated to countries experiencing post-conflict episodes. We also argue for aid delivered in the form of projects to countries with weak institutions in early post-conflict years. The second section focuses on policies for donors operating in conflict-affected countries. We set out five of the most important principles: (1) focus on broad-based recovery from war; (2) to achieve a broad-based recovery, get involved before the conflict ends; (3) focus on poverty, but avoid &lsquo;wish lists&rsquo;; (4) help to reduce insecurity so aid can contribute more effectively to growth and poverty reduction; and (5) in economic reform, focus on improving public expenditure management and revenue mobilisation. The third section concludes by emphasising the fact that there is no hard or fast dividing line between &lsquo;war&rsquo; and &lsquo;peace&rsquo; and that it may take many years for a society to become truly &lsquo;post&rsquo;-conflict&rsquo;. Donors, therefore, need to prepare for the long haul.<br /

    Securing ZigBee Commercial Communications Using Constellation Based Distinct Native Attribute Fingerprinting

    Get PDF
    This work provides development of Constellation Based DNA (CB-DNA) Fingerprinting for use in systems employing quadrature modulations and includes network protection demonstrations for ZigBee offset quadrature phase shift keying modulation. Results are based on 120 unique networks comprised of seven authorized ZigBee RZSUBSTICK devices, with three additional like-model devices serving as unauthorized rogue devices. Authorized network device fingerprints are used to train a Multiple Discriminant Analysis (MDA) classifier and Rogue Rejection Rate (RRR) estimated for 2520 attacks involving rogue devices presenting themselves as authorized devices. With MDA training thresholds set to achieve a True Verification Rate (TVR) of TVR = 95% for authorized network devices, the collective rogue device detection results for SNR ≥ 12 dB include average burst-by-burst RRR ≈ 94% across all 2520 attack scenarios with individual rogue device attack performance spanning 83.32% \u3c RRR \u3c 99.81%

    Posing Unique and Urgent Challenges to Understandings of Quality: Elucidations through a Froebelian lens

    Get PDF
    This paper reports on findings from a small pilot study undertaken with early years practitioners in Scotland.&nbsp; The Scottish Government is currently implementing its key election promise of almost doubling the entitlement to publicly funded early learning and childcare (ELC) for all three and four-year old and eligible two-year old children. A key message from the Scottish Government during this period has been that quality is at the heart of the expansion initiative (Scottish Government, 2017b). However, quality can be a contested and an ill understood concept (Moss, 2019). This pilot study, therefore, explored the perspectives of practitioners in Scotland regarding what quality in early years provision entails, particularly in this time of change and expansion. The paper will make three key arguments based on the findings from the study. First, that although quality is a much-used term in Scottish ELC settings, understandings of the term can be subjective, yet powerful and can leave practitioners with more questions than answers. Second, we argue that Fröbelian principles could ameliorate some of the issues regarding quality in Scotland, particularly in terms of combatting discrimination. Finally, we argue that those principles must be accompanied by a social justice lens in which prejudice and stereotypes are recognized, named, and unpacked and action for change taken
    • …