2,535 research outputs found
Nineteenth-century criticism of Milton's sonnets
Call number: LD2668 .R4 1968 G38
Fabrication and tuning of plasmonic optical nanoantennas around droplet epitaxy quantum dots by cathodoluminescence
We use cathodoluminescence to locate droplet epitaxy quantum dots with a
precision nm before fabricating nanoantennas in their vicinity by
electron-beam lithography. Cathodoluminescence is further used to evidence the
effect of the antennas as a function of their length on the light emitted by
the dot. Experimental results are in good agreement with numerical simulations
of the structures
Infrared-Faint Radio Sources are at high redshifts
Context: Infrared-Faint Radio Sources (IFRS) are characterised by relatively
high radio flux densities and associated faint or even absent infrared and
optical counterparts. The resulting extremely high radio-to-infrared flux
density ratios up to several thousands were previously known only for
High-redshift Radio Galaxies (HzRGs), suggesting a link between the two classes
of object. Prior to this work, no redshift was known for any IFRS in the
Australia Telescope Large Area Survey (ATLAS) fields which would help to put
IFRS in the context of other classes of object, especially of HzRGs. Aims: This
work aims at measuring the first redshifts of IFRS in the ATLAS fields.
Further, we test the hypothesis that IFRS are similar to HzRGs, as
higher-redshift or dust-obscured versions of these massive galaxies. Methods: A
sample of IFRS was spectroscopically observed using the Focal Reducer and Low
Dispersion Spectrograph 2 (FORS2) at the Very Large Telescope (VLT). The data
were calibrated based on the Image Reduction and Analysis Facility (IRAF) and
redshifts extracted. This information was then used to calculate rest-frame
luminosities, and to perform the first spectral energy distribution modelling
of IFRS based on redshifts. Results: We found redshifts of 1.84, 2.13, and
2.76, for three IFRS, confirming the suggested high-redshift character of this
class of object. These redshifts as well as the resulting luminosities show
IFRS to be similar to HzRGs. We found further evidence that fainter IFRS are at
even higher redshifts. Conclusions: Considering the similarities between IFRS
and HzRGs substantiated in this work, the detection of IFRS, which have a
significantly higher sky density than HzRGs, increases the number of Active
Galactic Nuclei in the early universe and adds to the problems of explaining
the formation of supermassive black holes shortly after the Big Bang.Comment: 7 pages, 4 figures; version in prin
Poverty in Latin America: Trends (1986-1998) and Determinants
This paper analyzes the evolution of poverty in Latin America. In 1998, about a third of the population was poor, and one sixth extreme poor. This represents 179 million poor people, of which 89 million lived in extreme poverty. The share of the populatioPoverty, education, employment
Taste-Changing in Staggered Quarks
We present results from a systematic perturbative investigation of
taste-changing in improved staggered quarks. We show one-loop taste-changing
interactions can be removed perturbatively by an effective four-quark term and
calculate the necessary coefficients.Comment: 3 pages using espcrc2.sty and amsmath.sty, 1 Feynman diagram using
feynmp.sty for Lattice2002(improve
Harnessing AI for Speech Reconstruction using Multi-view Silent Video Feed
Speechreading or lipreading is the technique of understanding and getting
phonetic features from a speaker's visual features such as movement of lips,
face, teeth and tongue. It has a wide range of multimedia applications such as
in surveillance, Internet telephony, and as an aid to a person with hearing
impairments. However, most of the work in speechreading has been limited to
text generation from silent videos. Recently, research has started venturing
into generating (audio) speech from silent video sequences but there have been
no developments thus far in dealing with divergent views and poses of a
speaker. Thus although, we have multiple camera feeds for the speech of a user,
but we have failed in using these multiple video feeds for dealing with the
different poses. To this end, this paper presents the world's first ever
multi-view speech reading and reconstruction system. This work encompasses the
boundaries of multimedia research by putting forth a model which leverages
silent video feeds from multiple cameras recording the same subject to generate
intelligent speech for a speaker. Initial results confirm the usefulness of
exploiting multiple camera views in building an efficient speech reading and
reconstruction system. It further shows the optimal placement of cameras which
would lead to the maximum intelligibility of speech. Next, it lays out various
innovative applications for the proposed system focusing on its potential
prodigious impact in not just security arena but in many other multimedia
analytics problems.Comment: 2018 ACM Multimedia Conference (MM '18), October 22--26, 2018, Seoul,
Republic of Kore
Detection of response to command using voluntary control of breathing in disorders of consciousness
Background:: Detecting signs of consciousness in patients in a vegetative state/unresponsive wakefulness syndrome (UWS/VS) or minimally conscious state (MCS) is known to be very challenging. Plotkin et al. (2010) recently showed the possibility of using a breathing-controlled communication device in patients with locked in syndrome. We here aim to test a breathing-based “sniff controller” that could be used as an alternative diagnostic tool to evaluate response to command in severely brain damaged patients with chronic disorders of consciousness (DOC). Methods:: Twenty-five DOC patients were included. Patients’ resting breathing-amplitude was measured during a 5 min resting condition. Next, they were instructed to end the presentation of a music sequence by sniffing vigorously. An automated detection of changes in breathing amplitude (i.e., >1.5 SD of resting) ended the music and hence provided positive feedback to the patient. Results:: None of the 11 UWS/VS patients showed a sniff-based response to command. One out of 14 patients with MCS was able to willfully modulate his breathing pattern to answer the command on 16/19 trials (accuracy 84%). Interestingly, this patient failed to show any other motor response to command. Discussion: We here illustrate the possible interest of using breathing-dependent response to command in the detection of residual cognition in patients with DOC after severe brain injury
Electroencephalogram approximate entropy influenced by both age and sleep
The use of information-based measures to assess changes in conscious state is an increasingly popular topic. Though recent results have seemed to justify the merits of such methods, little has been done to investigate the applicability of such measures to children. For our work, we used the approximate entropy (ApEn), a measure previously shown to correlate with changes in conscious state when applied to the electroencephalogram (EEG), and sought to confirm whether previously reported trends in adult ApEn values across wake and sleep were present in children. Besides validating the prior findings that ApEn decreases from wake to sleep (including wake, rapid eye movement (REM) sleep, and non-REM sleep) in adults, we found that previously reported ApEn decreases across vigilance states in adults were also present in children (ApEn trends for both age groups: wake > REM sleep > non-REM sleep). When comparing ApEn values between age groups, adults had significantly larger ApEn values than children during wakefulness. After the application of an 8 Hz high-pass filter to the EEG signal, ApEn values were recalculated. The number of electrodes with significant vigilance state effects dropped from all 109 electrodes with the original 1 Hz filter to 1 electrode with the 8 Hz filter. The number of electrodes with significant age effects dropped from 10 to 4. Our results support the notion that ApEn can reliably distinguish between vigilance states, with low-frequency sleep-related oscillations implicated as the driver of changes between vigilance states. We suggest that the observed differences between adult and child ApEn values during wake may reflect differences in connectivity between age groups, a factor which may be important in the use of EEG to measure consciousness
Intelligent scheduling for in-car notifications.
The process of driving a car involves a cognitive
load that varies over time. Additional load comes from secondary
factors not directly associated with the driving process, including
navigation devices, entertainment systems and the car’s own
warnings. In this paper, we present a framework for intelligent
scheduling of in-car notifications based on the driver’s estimated
cognitive load. As the single channel for communication, it
reschedules the notifications using a priority queue, and relays
them to the driver based on the urgency of the notification and
the overall estimated cognitive load being experienced by the
driver at any given moment. We evaluate our system using a
dataset collected from a car’s CAN bus during multiple onroad trials and show that our proposed approach reduces the
number of simultaneous calls on the driver’s attention during the
driving task. We also demonstrate that our intelligent scheduling
significantly reduces the maximum cognitive load experienced by
the driver and the frequency with which high loads occur
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