Scalable Scheduling Policy Design for Open Soft Real-Time Systems

Open soft real-time systems, such as mobile robots, must respond adaptively to varying operating conditions, while balancing the need to perform multiple mission specific tasks against the requirement that those tasks complete in a timely manner. Setting and enforcing a utilization target for shared resources is a key mechanism for achieving this behavior. However, because of the uncertainty and non-preemptability of some tasks, key assumptions of classical scheduling approaches do not hold. In previous work we presented foundational methods for generating task scheduling policies to enforce proportional resource utilization for open soft real-time systems with these properties. However, these methods scale exponentially in the number of tasks, limiting their practical applicability. In this paper, we present a novel parameterized scheduling policy that scales our technique to a much wider range of systems. These policies can represent geometric features of the scheduling policies produced by our earlier methods, but only require a number of parameters that is quadratic in the number of tasks. We provide empirical evidence that the best of these policies are competitive with exact solution methods in small problems, and significantly outperform heuristic methods in larger ones

Brass Happenings

Presenting a student recital for brass students in USU\u27s Music Department.https://digitalcommons.usu.edu/music_programs/1107/thumbnail.jp

Hero shots: involved fathers conquering new discursive territory in consumer culture

In this paper, we explore how visual expressions of culture offer new discursive territory within which consumer cultural ideals can be negotiated on a global scale. Through a critical visual analysis of the revelatory case Swedish Dads, we find hero shots depicting involved fathers where children’s needs and the hermetic confines of the home take center stage, as opposed to the traditional fatherhood ideals portrayed in western contemporary advertising, media, and popular culture. We demonstrate how the Swedish state’s gender ideology was encoded into a communicative event in the form of hero shots and subsequently dispersed by visual consumers as well as political and commercial stakeholders pushing this particular agenda and/or capitalizing on its tendencies. This in such a way that the event conquered new discursive territory fostering new types of consumer cultural negotiations on fatherhood ideals also in other cultural settingspublishedVersio

Brass Happenings 2016

https://digitalcommons.usu.edu/music_programs/1070/thumbnail.jp

Coronal Heating as Determined by the Solar Flare Frequency Distribution Obtained by Aggregating Case Studies

Flare frequency distributions represent a key approach to addressing one of the largest problems in solar and stellar physics: determining the mechanism that counter-intuitively heats coronae to temperatures that are orders of magnitude hotter than the corresponding photospheres. It is widely accepted that the magnetic field is responsible for the heating, but there are two competing mechanisms that could explain it: nanoflares or Alfv\'en waves. To date, neither can be directly observed. Nanoflares are, by definition, extremely small, but their aggregate energy release could represent a substantial heating mechanism, presuming they are sufficiently abundant. One way to test this presumption is via the flare frequency distribution, which describes how often flares of various energies occur. If the slope of the power law fitting the flare frequency distribution is above a critical threshold, $\alpha=2$ as established in prior literature, then there should be a sufficient abundance of nanoflares to explain coronal heating. We performed $>$600 case studies of solar flares, made possible by an unprecedented number of data analysts via three semesters of an undergraduate physics laboratory course. This allowed us to include two crucial, but nontrivial, analysis methods: pre-flare baseline subtraction and computation of the flare energy, which requires determining flare start and stop times. We aggregated the results of these analyses into a statistical study to determine that $\alpha = 1.63 \pm 0.03$. This is below the critical threshold, suggesting that Alfv\'en waves are an important driver of coronal heating.Comment: 1,002 authors, 14 pages, 4 figures, 3 tables, published by The Astrophysical Journal on 2023-05-09, volume 948, page 7