Paul Hubbard

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The environmental science and engineering communities are actively engaged in planning and developing the next generation of large-scale sensor-based observing systems. These systems face two significant challenges: heterogeneity of instrumentation and complexity of data stream processing. Environmental observing systems incorporate instruments across the(More)
Earthquake engineers have traditionally investigated the behavior of structures with either computational simulations or physical experiments. Recently, a new hybrid approach has been proposed that allows tests to be decomposed into independent substructures that can be located at different test facilities, tested separately, and integrated via a(More)
A hierarchical control theory is presented founded upon the Trace-dynamical consistency (DC) property, which is an extension of the notion of dynamical consistency [1]–[3] to the supervisory case of automata with disablable transitions. Partitions of a system state space are considered for which the Trace-DC and, further, the (nonblocking) IBC conditions(More)
Thiaminases, enzymes that cleave vitamin B1, are sporadically distributed among prokaryotes and eukaryotes. Thiaminase I enzymes catalyze the elimination of the thiazole ring moiety from thiamin through substitution of the methylene group with a nitrogenous base or sulfhydryl compound. In eukaryotic organisms, these enzymes are reported to have much higher(More)
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The NEESgrid project is revolutionizing the way earthquake engineering (EE) researchers collaborate to plan, perform, share and publish research even while being geographically separated. The proposed demonstration is in complement to the NEESgrid paper titled "Distributed Hybrid Earthquake Engineering Experiments: Experiences with a Ground-Shaking Grid(More)
We present a hierarchical control theory for supervisory automata based on state aggregation. Conditions are determined on state partitions which ensure that the control of transitions between blocks in a high-level (i.e. aggregated) model, combined with local state-dependent controls, is eeective in the sense of achieving speciications given either for the(More)
We present a hierarchical control theory for supervisory automata based on state aggregation. Conditions are determined on state partitions which ensure that the control of transitions between blocks in a high level (i.e. aggregated) model, combined with local state-dependent controls, is eeective in the sense of achieving speciications given either for the(More)
The Collider Detector at Fermilab (CDF) collaboration records and analyses proton anti-proton interactions with a center-of-mass energy of 2TeV at the Tevatron. A new collider run, Run II, of the Tevatron started in April. During its more than two year duration the CDF experiment expects to record about 1 PetaByte of data. With its multi-purpose detector(More)