4,692 research outputs found
On the spectrum of operators concerned with the reduced singular Cauchy integral
We investigate spectrums of the reduced singular Cauchy operator and its real and imaginary components
HDIdx: High-Dimensional Indexing for Efficient Approximate Nearest Neighbor Search
Fast Nearest Neighbor (NN) search is a fundamental challenge in large-scale
data processing and analytics, particularly for analyzing multimedia contents
which are often of high dimensionality. Instead of using exact NN search,
extensive research efforts have been focusing on approximate NN search
algorithms. In this work, we present "HDIdx", an efficient high-dimensional
indexing library for fast approximate NN search, which is open-source and
written in Python. It offers a family of state-of-the-art algorithms that
convert input high-dimensional vectors into compact binary codes, making them
very efficient and scalable for NN search with very low space complexity
Recent advances in deep learning for object detection
Object detection is a fundamental visual recognition problem in computer
vision and has been widely studied in the past decades. Visual object detection
aims to find objects of certain target classes with precise localization in a
given image and assign each object instance a corresponding class label. Due to
the tremendous successes of deep learning based image classification, object
detection techniques using deep learning have been actively studied in recent
years. In this paper, we give a comprehensive survey of recent advances in
visual object detection with deep learning. By reviewing a large body of recent
related work in literature, we systematically analyze the existing object
detection frameworks and organize the survey into three major parts: (i)
detection components, (ii) learning strategies, and (iii) applications &
benchmarks. In the survey, we cover a variety of factors affecting the
detection performance in detail, such as detector architectures, feature
learning, proposal generation, sampling strategies, etc. Finally, we discuss
several future directions to facilitate and spur future research for visual
object detection with deep learning. Keywords: Object Detection, Deep Learning,
Deep Convolutional Neural Network
Composite Fermions in Negative Effective Magnetic Field: A Monte-Carlo Study
The method of Jain and Kamilla [PRB {\bf 55}, R4895 (1997)] allows numerical
generation of composite fermion trial wavefunctions for large numbers of
electrons in high magnetic fields at filling fractions of the form nu=p/(2mp+1)
with m and p positive integers. In the current paper we generalize this method
to the case where the composite fermions are in an effective (mean) field with
opposite sign from the actual physical field, i.e. when p is negative. We
examine both the ground state energies and the low energy neutral excitation
spectra of these states. Using particle-hole symmetry we can confirm the
correctness of our method by comparing results for the series m=1 with p>0
(previously calculated by others) to our results for the conjugate series m=1
with p <0. Finally, we present similar results for ground state energies and
low energy neutral excitations for the states with m=2 and p <0 which were not
previously addressable, comparing our results to the m=1 case and the p > 0,
m=2 cases.Comment: 11 page
Antinociception Following Implantation of AtT-20 and Genetically Modified AtT-20/hENK Cells in Rat Spinal Cord
AtT-20 cells, which produce β-endorphin,
and AtT-20/hENK cells, which are AtT-20 cells
transfected with a proenkephalin gene, were
implanted in the rat spinal subarachnoid space
in an effort to produce an antinociceptive effect.
Host rats were tested for antinociceptive activity
by standard nociceptive tests, tail flick and hot
plate. Although cell implants had minimal effect
on the basal response to thermal nociceptive
stimuli, administration of the β2-adrenergic
agonist isoproterenol produced antinociception
in the cell-implanted group but not in the
control group. The antinociceptive effect of
isoproterenol was dose-related and could be
blocked by the opioid antagonist naloxone.
Immunohistochemical analysis of spinal cords
revealed the presence of enkephalin-negative
cells surrounding the spinal cord of rats
receiving AtT-20 cell implants, and enkephalinpositive
cells surrounding the spinal cord of rats.
receiving AtT-20/hENK cell implants. These
results suggest that opioid-releasing cells
implanted around rat spinal cord can produce
antinociception and may provide an alternative
therapy for chronic pain
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