3,763 research outputs found

    Energy-Efficient Scheduling for Homogeneous Multiprocessor Systems

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    We present a number of novel algorithms, based on mathematical optimization formulations, in order to solve a homogeneous multiprocessor scheduling problem, while minimizing the total energy consumption. In particular, for a system with a discrete speed set, we propose solving a tractable linear program. Our formulations are based on a fluid model and a global scheduling scheme, i.e. tasks are allowed to migrate between processors. The new methods are compared with three global energy/feasibility optimal workload allocation formulations. Simulation results illustrate that our methods achieve both feasibility and energy optimality and outperform existing methods for constrained deadline tasksets. Specifically, the results provided by our algorithm can achieve up to an 80% saving compared to an algorithm without a frequency scaling scheme and up to 70% saving compared to a constant frequency scaling scheme for some simulated tasksets. Another benefit is that our algorithms can solve the scheduling problem in one step instead of using a recursive scheme. Moreover, our formulations can solve a more general class of scheduling problems, i.e. any periodic real-time taskset with arbitrary deadline. Lastly, our algorithms can be applied to both online and offline scheduling schemes.Comment: Corrected typos: definition of J_i in Section 2.1; (3b)-(3c); definition of \Phi_A and \Phi_D in paragraph after (6b). Previous equations were correct only for special case of p_i=d_

    What is the value of recourse to asset backed securities? A clinical study of credit card banks

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    The present paper uses data from revolving credit card securitizations to show that, conditional on being in a position where implicit recourse has become necessary and actually providing that recourse, recourse to securitized debt may benefit short- and long-term stock returns, and long-term operating performance of sponsors. The paper suggests that this result may come about because those sponsors providing the recourse do not seem to be extreme default or insolvency risks. However, sponsors providing recourse do experience an abnormal delay in their normal issuance cycle around the event. Hence, it appears that the asset-backed securities market is like the commercial paper market, where a firm's ability to issue is directly correlated with credit quality. Therefore, although in violation of regulatory guidelines and FASB140, recourse may have beneficial effects for sponsors by revealing that the shocks that made recourse necessary are transitory. ; Also issued as Payment Cards Center Discussion Paper No. 03-04Asset-backed financing ; Credit cards

    How to Get Hit on the Head and Laugh About It: Humor in the Formation of Self

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    Students come to a university for many reasons, but rarely would one say that one of those reasons is to tell (or listen to) jokes. But I think humor can be much more central to students’ educational experience than they, or we, realize. This paper explores what role humor might play in the academic identities of university students. It does not call on teachers to begin telling jokes as a way of engaging students with course material. Rather, it asks teachers to recognize how comedic activities and identities that seem to undercut traditional classroom decorum can be necessary to intellectual development

    Reference: a field guide for new practices

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    The following work is an experimentation within architecture to promote a social ideology of reuse, where we must first re-frame and dismantle the traditional perceptions of building materials, in order for the discipline of architecture to utilize the practice of unbuilding.The thesis analyzes the suburban condition and its relationship to big box stores like Home Depot and Lowes. Through a re-imagining of this relationship the question of material longevity centers itself as the main design motive for the project and how a new understanding of this potential can be extruded through community engagement. This new depot which the work understands as “municipal” sets to prioritize a dismantling of typical single family residential units, such as wood studs from a wall, as the product for this new depot. The representation of this thesis acts as a field guide to be the main instruction manual for how a community can take part in this process. Specifically our community is centered in a suburb of Chicago that takes full advantage of the grid/lot/alley structure that defines this region of the country. Within this community exists a potential variety of knowledge about construction so information sharing, such as understanding how to build and unbuild, between neighbors is vital. The municipal depot or the less formal “shed”, acts as the hub for this type of information sharing at multiple levels either academic or accidental. The field guide becomes an artifact of this knowledge as it sets to be a basis of this education and transforms into a larger bank of instruction, put together by the community, within the website. It is also important to note that each act of unbuilding is dependent on the main characteristics of the residential units themselves so other implementations of this system should be adaptable rather than standardized of which this is the first of its kind

    Greening the Globe, One Map at a Time

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    Literacy is often conceived as the literacy of community members, but rarely as these members’ literacy of their communities. Although our sense of community has become increasingly separated from geography, our local environment is a critical resource for developing the eco-literacy necessary to imagine sustainable futures. The Green Map® movement offers a model for how educators can encourage such literacy through engagement with the local community. Green maps are maps of local green-living resources, including sites of cultural, natural, and civic significance. These maps are created by local citizens with support from the Green Map® organization, which has inspired a new era of grass-roots cartography. By involving students in the production of green maps, educators can encourage an ecoliteracy that is grounded in the local community and focused on designing shared visions of responsible co-existence
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