1,283 results for Conference paper

  • Architecture and implementation of an agent-based simulation tool for market-based pricing in Next-Generation Wireless Networks

    Roggendorf, Matthias; Beltran, Fernando; Gutierrez, Jairo (2006)

    Conference paper
    The University of Auckland Library

    An open access copy of this article is available and complies with the copyright holder/publisher conditions. We present a generic, agent-based simulation environment for dynamic pricing in next-generation wireless networks. While a lot of effort has been put into simulation platforms for recreating the behaviour of IP-based traffic in fixed and wireless networks, no standard platform for simulating different pricing schemes in such networks has yet emerged. Our work is driven by the vision of a ubiquitous wireless network environment, in which users can dynamically request network resources for various use from different, potentially competing network providers. For such a scenario, new pricing approaches are needed to charge the user according to dynamic factors such as current congestion levels or the the number of customers present at a specific location. The developed simulation environment serves as a generic tool for implementing and testing different pricing approaches.

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  • Modeling blood flow in the gastrointesinal system

    Mabotuwana, Thusitha; Pullan, A J; Smith, N P; Cheng, Leo K (2006)

    Conference paper
    The University of Auckland Library

    Compared to cardiac ischemia, relatively little is known about ischemia that develops within the gastrointestinal system. The work presented here is a first step towards developing a detailed anatomically and biophysically based model of the mesenteric arterial system of the human intestine to be used to simulate normal and compromised blood flows. Data from the Visible Human project were used to develop an initial model of the mesenteric arterial tree. Using this tree, equations that govern blood flow within extensible vessels were set up and solved for pressure, radius and velocity. Results were analyzed for the four distinct phases of cardiac contraction - diastole, isovolumic contraction, ejection and isovolumic relaxation and the profiles showing the temporally varying pressure and velocity within the network for a periodic input varying between 10.29 kPa (77 mmHg) and 14.63 kPa (110 mmHg) at the abdominal aorta are presented in this paper.

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  • The maternal, fetal and postnatal somatotrophic axes in intrauterine growth retardation.

    Oliver, MH; Bloomfield, FH; Harding, JE; Breier, BH; Bassett, NS; Gluckman, PD (1999)

    Conference paper
    The University of Auckland Library

    Both the maternal and fetal somatotrophic axes are closely linked to fetal substrate supply. Nutritional insults at critical stages of fetal development may lead to permanent reprogramming of the relationships between these factors. The consequences of reprogramming during fetal life may be harmful to metabolic, endocrine and cardiovascular homoeostatic mechanisms in postnatal life. The exact mechanisms that lead to reprogramming during fetal life need thorough investigation before effective strategies to deal with this problem can be devised.

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