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C-slow retimed parallel histogram architectures for consumer imaging devices
A parallel pipelined array of cells suitable for real-time computation of histograms is proposed. The cell architecture builds on previous work obtained via C-slow retiming techniques and can be clocked at 65 percent faster frequency than previous arrays. The new arrays can be exploited for higher throughput particularly when dual data rate sampling techniques are used to operate on single streams of data from image sensors. In this way, the new cell operates on a p-bit data bus which is more convenient for interfacing to camera sensors or to microprocessors in consumer digital cameras
Profiling time course expression of virus genes---an illustration of Bayesian inference under shape restrictions
There have been several studies of the genome-wide temporal transcriptional
program of viruses, based on microarray experiments, which are generally useful
in the construction of gene regulation network. It seems that biological
interpretations in these studies are directly based on the normalized data and
some crude statistics, which provide rough estimates of limited features of the
profile and may incur biases. This paper introduces a hierarchical Bayesian
shape restricted regression method for making inference on the time course
expression of virus genes. Estimates of many salient features of the expression
profile like onset time, inflection point, maximum value, time to maximum
value, area under curve, etc. can be obtained immediately by this method.
Applying this method to a baculovirus microarray time course expression data
set, we indicate that many biological questions can be formulated
quantitatively and we are able to offer insights into the baculovirus biology.Comment: Published in at http://dx.doi.org/10.1214/09-AOAS258 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Towards low-latency real-time detection of gravitational waves from compact binary coalescences in the era of advanced detectors
Electromagnetic (EM) follow-up observations of gravitational wave (GW) events
will help shed light on the nature of the sources, and more can be learned if
the EM follow-ups can start as soon as the GW event becomes observable. In this
paper, we propose a computationally efficient time-domain algorithm capable of
detecting gravitational waves (GWs) from coalescing binaries of compact objects
with nearly zero time delay. In case when the signal is strong enough, our
algorithm also has the flexibility to trigger EM observation before the merger.
The key to the efficiency of our algorithm arises from the use of chains of
so-called Infinite Impulse Response (IIR) filters, which filter time-series
data recursively. Computational cost is further reduced by a template
interpolation technique that requires filtering to be done only for a much
coarser template bank than otherwise required to sufficiently recover optimal
signal-to-noise ratio. Towards future detectors with sensitivity extending to
lower frequencies, our algorithm's computational cost is shown to increase
rather insignificantly compared to the conventional time-domain correlation
method. Moreover, at latencies of less than hundreds to thousands of seconds,
this method is expected to be computationally more efficient than the
straightforward frequency-domain method.Comment: 19 pages, 6 figures, for PR
Progress on the Low-Latency Inspiral Gravitational Wave Detection algorithm known as SPIIR
Low-latency event triggers to signify the presence of gravitational waves from coalescing binaries will be required to make prompt electromagnetic follow-up observations of electromagnetic counterparts. We present the recent progress made on implementing the time-domain low-latency detection algorithm known as summed parallel infinite impulse response (SPIIR) filtering into a real gravitational wave search pipeline
Coordination complexes as molecular glue for immobilization of antibodies on cyclic olefin copolymer surfaces
A novel metal-based chelating method has been used to provide an order of magnitude increase in immunoassay performance on cyclic olefin copolymer (COC) plastics compared with passive binding. COCs are hydrophobic, and without surface modification they are often unsuitable for applications where protein adhesion is desired. When interacting with the bare plastic, the majority of the bound proteins will be denatured and become nonfunctional. Many of the surface modification techniques reported to date require costly equipment setup or the use of harsh reaction conditions. Here, we have successfully demonstrated the use of a simple and quick metal chelation method to increase the sensitivity, activity, and efficiency of protein binding to COC surfaces. A detailed analysis of the COC surfaces after activation with the metal complexes is presented, and the immunoassay performance was studied using three different antibody pairs
Phylogeography of the pharaoh cuttle Sepia pharaonis based on partial mitochondrial 16S sequence data
The pharaoh cuttle Sepia pharaonis
Ehrenberg, 1831 (Mollusca: Cephalopoda: Sepiida)
is a broadly distributed species of substantial
fisheries importance found from east Africa to
southern Japan. Little is known about S. pharaonis
phylogeography, but evidence from morphology
and reproductive biology suggests that
Sepia pharaonis is actually a complex of at least
three species. To evaluate this possibility, we
collected tissue samples from Sepia pharaonis
from throughout its range. Phylogenetic analyses
of partial mitochondrial 16S sequences from these
samples reveal five distinct clades: a Gulf of
Aden/Red Sea clade, a northern Australia clade,
a Persian Gulf/Arabian Sea clade, a western
Pacific clade (Gulf of Thailand and Taiwan) and
an India/Andaman Sea clade. Phylogenetic
analyses including several Sepia species show that
S. pharaonis sensu lato may not be monophyletic.
We suggest that ‘‘S. pharaonis’’ may consist of up
to five species, but additional data will be
required to fully clarify relationships within the
S. pharaonis complex
Distributed Adaptive Attitude Synchronization of Multiple Spacecraft
This paper addresses the distributed attitude synchronization problem of
multiple spacecraft with unknown inertia matrices. Two distributed adaptive
controllers are proposed for the cases with and without a virtual leader to
which a time-varying reference attitude is assigned. The first controller
achieves attitude synchronization for a group of spacecraft with a leaderless
communication topology having a directed spanning tree. The second controller
guarantees that all spacecraft track the reference attitude if the virtual
leader has a directed path to all other spacecraft. Simulation examples are
presented to illustrate the effectiveness of the results.Comment: 13 pages, 11 figures. To appear in SCIENCE CHINA Technological
Science
Microscopic models for fractionalized phases in strongly correlated systems
We construct explicit examples of microscopic models that stabilize a variety
of fractionalized phases of strongly correlated systems in spatial dimension
bigger than one, and in zero external magnetic field. These include models of
charge fractionalization in boson-only systems, and various kinds of
spin-charge separation in electronic systems. We determine the excitation
spectrum and show the consistency with that expected from field theoretic
descriptions of fractionalization. Our results are further substantiated by
direct numerical calculation of the phase diagram of one of the models.Comment: 10 pages, 4 figure
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