Browsing by Subject "Computer models"
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Item Easing software development for pervasive computing environments(2009-12) Stovall, Andrew Erich; Julien, ChristineIn recent years pervasive computing has enjoyed an amazing growth in both research and commercial fields. Not only have the number of available techniques and tools expanded, but the number of actual deployments has been underwhelming. With this growth however, we are also experiencing a divergence of software interfaces, languages, and techniques. This leads to an understandably confusing landscape which needlessly burdens the development of applications. It is our sincere hope that through the use of specialized interfaces, languages, and tools, we can make pervasive computing environments more approachable and efficient to software developers and thereby increase the utility and value of pervasive computing applications. In this dissertation, we present a new method for creating and managing the long-term conversations between peers in pervasive computing environments. The Application Sessions Model formally describes these conversations and specifies techniques for managing them over their lifetimes. In addition to these descriptions, this dissertation presents a prototype implementation of the model and results from its use for realistic scenarios. To address the Application Sessions Model's unique needs for resource discovery in pervasive computing environments, we also present the Evolving Tuples Model. This model is also formally defined in this dissertation and practical examples are used to clarify its features. A prototype for both sensor hardware and software simulation of this model is described along with results characterizing the behavior of the model. The models, prototypes, and evaluations of both models presented here form the basis of a new and interesting line of research into support structures for pervasive computing application development.Item Modeling of a silicon/silicon carbide pressureless infiltration process(2007-05) Johnson, Gerard Adriel, 1983-; Beaman, Joseph J.During the experimental phase of this research, experimentalists discovered several small protrusions on the surface of silicon/silicon carbide metal matrix composites, which were created using a customized pressureless infiltration technique. These protrusions, called overfillings, differed in size and were spontaneously distributed on the surface of the infiltrated body. It was hypothesized that these overfillings were the result of the silicon’s large positive volume phase change. Through the use of several computer models, hypothesis of the previous experimental research was confirmed. It was ultimately determined that the overfillings are not the result of the shrinking silicon carbide skeleton, but are, instead, the result of the silicon’s phase change properties, which cause it to expand upon solidification. As the infiltrated body cools, the silicon changes from liquid to solid phase, expanding 10%. Because the silicon carbide skeleton is completely saturated with the liquid silicon, the liquid silicon is forced out of the composite as it solidifies, resulting in overfilling. Not only does this paper provide a detailed analysis of the computer modeling techniques used for the simulations and their correlating results, but this paper also explains the experimental research on which the computer models are founded.