3,614 research outputs found
Transfer Learning from Deep Features for Remote Sensing and Poverty Mapping
The lack of reliable data in developing countries is a major obstacle to
sustainable development, food security, and disaster relief. Poverty data, for
example, is typically scarce, sparse in coverage, and labor-intensive to
obtain. Remote sensing data such as high-resolution satellite imagery, on the
other hand, is becoming increasingly available and inexpensive. Unfortunately,
such data is highly unstructured and currently no techniques exist to
automatically extract useful insights to inform policy decisions and help
direct humanitarian efforts. We propose a novel machine learning approach to
extract large-scale socioeconomic indicators from high-resolution satellite
imagery. The main challenge is that training data is very scarce, making it
difficult to apply modern techniques such as Convolutional Neural Networks
(CNN). We therefore propose a transfer learning approach where nighttime light
intensities are used as a data-rich proxy. We train a fully convolutional CNN
model to predict nighttime lights from daytime imagery, simultaneously learning
features that are useful for poverty prediction. The model learns filters
identifying different terrains and man-made structures, including roads,
buildings, and farmlands, without any supervision beyond nighttime lights. We
demonstrate that these learned features are highly informative for poverty
mapping, even approaching the predictive performance of survey data collected
in the field.Comment: In Proc. 30th AAAI Conference on Artificial Intelligenc
Physics performances for Scalar Electrons, Scalar Muons and Scalar Neutrinos searches at CLIC
The determination of scalar leptons and gauginos masses is an important part
of the program of spectroscopic studies of Supersymmetry at a high energy
linear collider. In this talk we present results of a study of pair produced
Scalar Electrons, Scalar Muons and Scalar Neutrinos searches in a
Supersymmetric scenario at 3 TeV at CLIC. We present the performances on the
lepton energy resolution and report the expected accuracies on the production
cross sections and on the scalar leptons and gauginos masses.Comment: Linera Collider Workshop, LCWS11, 6 pages, 2 figures, 4 table
Marshall University Music Department Presents Monty Cole, clarinet, Jean Roberts, piano
https://mds.marshall.edu/music_perf/1204/thumbnail.jp
Chromosomes Of Cruciferae I. Descurainia
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141162/1/ajb213954.pd
Surviving sepsis: a guide to the guidelines
The revised Surviving Sepsis Campaign (SSC) guidelines for the management of severe sepsis and septic shock have recently been published. These guidelines represent the end product of an intense process and provide a template approach to the early resuscitation and support of patients with sepsis, based on a synthesis of evidence that has been shown to improve the outcome of the septic patient. The SSC guidelines arose from a recognition that care of the septic patient was suboptimal for at least three reasons. First, the entity of sepsis was frequently not diagnosed in a timely fashion, allowing the process to evolve into a life-threatening syndrome of major physiologic organ system dysfunction. Secondly, even when sepsis was recognized, the urgency of treatment was underappreciated – and so haemodynamic resuscitation was tentative, and the administration of effective antibiotic therapy was often delayed. Finally, treatment was often suboptimal, and failed to take advantage of emerging insights into optimal approaches to patient management. The revised guidelines are far from perfect, but they represent the best available synthesis of contemporary knowledge in this area and as such should be promoted
Particle acceleration in the M87 jet
The wealth of high quality data now available on the M87 jet inspired us to
carry out a detailed analysis of the plasma physical conditions in the jet. In
a companion paper (Lobanov, Hardee & Eilek, this proceedings) we identify a
double-helix structure within the jet, and apply Kelvin-Helmholtz stability
analysis to determine the physical state of the jet plasma. In this paper we
treat the jet as a test case for in situ particle acceleration. We find that
plasma turbulence is likely to exist at levels which can maintain the energy of
electrons radiating in the radio to optical range, consistent with the
broadband spectrum of the jet.Comment: 4 pages; to appear in New Astronomy Reviews, in proceedings of the
meeting "The Physics of Relativistic Jets in the CHANDRA and XMM Era
Gemini Planet Imager Observational Calibrations III: Empirical Measurement Methods and Applications of High-Resolution Microlens PSFs
The newly commissioned Gemini Planet Imager (GPI) combines extreme adaptive
optics, an advanced coronagraph, precision wavefront control and a
lenslet-based integral field spectrograph (IFS) to measure the spectra of young
extrasolar giant planets between 0.9-2.5 um. Each GPI detector image, when in
spectral model, consists of ~37,000 microspectra which are under or critically
sampled in the spatial direction. This paper demonstrates how to obtain
high-resolution microlens PSFs and discusses their use in enhancing the
wavelength calibration, flexure compensation and spectral extraction. This
method is generally applicable to any lenslet-based integral field spectrograph
including proposed future instrument concepts for space missions.Comment: 10 pages, 6 figures. Proceedings of the SPIE, 9147-282 v2: reference
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