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An Archaeology of Social Space: Analyzing Coffee Plantations in Jamaica\u27s Blue Mountains
Exploiting tightly-coupled cores
This is the published manuscript. It was first published by Springer in the Journal of Signal Processing Systems here: http://link.springer.com/article/10.1007%2Fs11265-014-0944-6.The individual processors of a chip-multiprocessor
traditionally have rigid boundaries. Inter-core communication is
only possible via memory and control over a core’s resources is
localised. Specialisation necessary to meet today’s challenging
energy targets is typically provided through the provision of
a range of processor types and accelerators. An alternative
approach is to permit specialisation by tailoring the way a large
number of homogeneous cores are used. The approach here
is to relax processor boundaries, create a richer mix of intercore
communication mechanisms and provide finer-grain control
over, and access to, the resources of each core. We evaluate one
such design, called Loki, that aims to support specialisation in
software on a homogeneous many-core architecture. We focus
on the design of a single 8-core tile, conceived as the building
block for a larger many-core system. We explore the tile’s ability
to support a range of parallelisation opportunities and detail
the control and communication mechanisms needed to exploit
each core’s resources in a flexible manner. Performance and a
detailed breakdown of energy usage is provided for a range of
benchmarks and configurations.This work was supported by EPSRC grant EP/G033110/1
Revisiting Embeddings for Graph Neural Networks
Current graph representation learning techniques use Graph Neural Networks
(GNNs) to extract features from dataset embeddings. In this work, we examine
the quality of these embeddings and assess how changing them can affect the
accuracy of GNNs. We explore different embedding extraction techniques for both
images and texts; and find that the performance of different GNN architectures
is dependent on the embedding style used. We see a prevalence of bag of words
(BoW) embeddings and text classification tasks in available graph datasets.
Given the impact embeddings has on GNN performance. this leads to a phenomenon
that GNNs being optimised for BoW vectors
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WH2 and proline-rich domains of WASP-family proteins collaborate to accelerate actin filament elongation.
WASP-family proteins are known to promote assembly of branched actin networks by stimulating the filament-nucleating activity of the Arp2/3 complex. Here, we show that WASP-family proteins also function as polymerases that accelerate elongation of uncapped actin filaments. When clustered on a surface, WASP-family proteins can drive branched actin networks to grow much faster than they could by direct incorporation of soluble monomers. This polymerase activity arises from the coordinated action of two regulatory sequences: (i) a WASP homology 2 (WH2) domain that binds actin, and (ii) a proline-rich sequence that binds profilin-actin complexes. In the absence of profilin, WH2 domains are sufficient to accelerate filament elongation, but in the presence of profilin, proline-rich sequences are required to support polymerase activity by (i) bringing polymerization-competent actin monomers in proximity to growing filament ends, and (ii) promoting shuttling of actin monomers from profilin-actin complexes onto nearby WH2 domains. Unoccupied WH2 domains transiently associate with free filament ends, preventing their growth and dynamically tethering the branched actin network to the WASP-family proteins that create it. Collaboration between WH2 and proline-rich sequences thus strikes a balance between filament growth and tethering. Our work expands the number of critical roles that WASP-family proteins play in the assembly of branched actin networks to at least three: (i) promoting dendritic nucleation; (ii) linking actin networks to membranes; and (iii) accelerating filament elongation
Mopra CO Observations of the Bubble HII Region RCW120
We use the Mopra radio telescope to test for expansion of the molecular gas
associated with the bubble HII region RCW120. A ring, or bubble, morphology is
common for Galactic HII regions, but the three-dimensional geometry of such
objects is still unclear. Detected near- and far-side expansion of the
associated molecular material would be consistent with a three-dimensional
spherical object. We map the transitions of CO,
CO, CO, and CO, and detect emission from all
isotopologues. We do not detect the masing lines of
CHOH at 108.8939 GHz. The strongest CO emission is from the
photodissociation region (PDR), and there is a deficit of emission toward the
bubble interior. We find no evidence for expansion of the molecular material
associated with RCW120 and therefore can make no claims about its geometry. The
lack of detected expansion is roughly in agreement with models for the
time-evolution of an HII region like RCW120, and is consistent with an
expansion speed of . Single-position CO spectra show
signatures of expansion, which underscores the importance of mapped spectra for
such work. Dust temperature enhancements outside the PDR of RCW120 coincide
with a deficit of emission in CO, confirming that these temperature
enhancements are due to holes in the RCW120 PDR. H emission shows that
RCW120 is leaking of the ionizing photons into the interstellar
medium (ISM) through PDR holes at the locations of the temperature
enhancements. H-alpha emission also shows a diffuse "halo" from leaked photons
not associated with discrete holes in the PDR. Overall of all
ionizing photons are leaking into the nearby ISM.Comment: 35 pages, 14 figures. Accepted to Ap
Changing shapes in the nanoworld
What are the mechanisms leading to the shape relaxation of three dimensional
crystallites ? Kinetic Monte Carlo simulations of fcc clusters show that the
usual theories of equilibration, via atomic surface diffusion driven by
curvature, are verified only at high temperatures. Below the roughening
temperature, the relaxation is much slower, kinetics being governed by the
nucleation of a critical germ on a facet. We show that the energy barrier for
this step linearly increases with the size of the crystallite, leading to an
exponential dependence of the relaxation time.Comment: 4 pages, 5 figures. Accepted by Phys Rev Let
The Effects of the Transition from Pre-nursing to Nursing on Mental Health
Mental health is an ever-growing crisis among adolescents and young adults, with suicide as second leading cause of death and the number of those negatively affected continually on the rise. Transitions are one of the major stressors prevalent among these age groups, placing individuals at risk for mental health deficits. This quantitative voluntary response comparative study assesses the transitional mental health of pre-nursing students and students in the nursing program at East Tennessee State University. Emailed to all with a declared major of pre-nursing or nursing, this study measured mental health using evidenced based assessment tools. The PHQ-9 for depression and the GAD-7 for anxiety, along with additional demographic information and mental health service usage questions, was sent to and completed by participants. A total of n = 173 responses were received. Of these responses n = 99 or 57.2 percent were nursing students, a participation rate of 9.6 percent, and n = 74 or 42.8 percent were pre-nursing students. The research revealed that depression and anxiety scores were above the cutoff for moderate depression and anxiety in both groups, as well as identified a deficit in availability of mental health resources, with over 10 percent of students unable to access counseling or psychiatric services. Contraindicatory to literature, which predicted improving mental health in the progression through university studies, this study reveals a variable and even worsening trajectory of mental health as students transition into the nursing program and progressed through college
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