10,609 research outputs found
AutoEncoder Inspired Unsupervised Feature Selection
High-dimensional data in many areas such as computer vision and machine
learning tasks brings in computational and analytical difficulty. Feature
selection which selects a subset from observed features is a widely used
approach for improving performance and effectiveness of machine learning models
with high-dimensional data. In this paper, we propose a novel AutoEncoder
Feature Selector (AEFS) for unsupervised feature selection which combines
autoencoder regression and group lasso tasks. Compared to traditional feature
selection methods, AEFS can select the most important features by excavating
both linear and nonlinear information among features, which is more flexible
than the conventional self-representation method for unsupervised feature
selection with only linear assumptions. Experimental results on benchmark
dataset show that the proposed method is superior to the state-of-the-art
method.Comment: accepted by ICASSP 201
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Development of a Personalized Quantitative Faculty Annual Evaluation System
Faculty annual evaluation is critical for faculty career
development and department success. Our department
developed a quantitative faculty evaluation metrics system
that is more objective, consistent, flexible, personalized,
transparent, and dynamic scoring system. We have
implemented the system for 2 years and the outcomes are
very encouraging in promoting faculty and department
success.Cockrell School of Engineerin
Study of the excited charm and charm-strange mesons
We give a systematical study on the recently reported excited charm and
charm-strange mesons with potential spin-parity, including the
, , , ,
and . The main strong decay properties are
obtained by the framework of Bethe-Salpeter (BS) methods. Our results reveal
that the two charm-strange mesons can be well described by the further
- mixing scheme with a mixing angle of
degrees. The predicted decay ratio
for is .~ can also be
explained as the predominant state with a mixing angle of
degrees. Considering the mass range, and
are more likely to be the predominant states,
although the total widths under both the and assignments
have no great conflict with the current experimental data. The calculated width
for LHCb seems about 100 \si{MeV} larger than experimental
measurement if taking it as or dominant state .
The comparisons with other calculations and several important decay ratios are
also present. For the identification of these charm mesons, further
experimental information, such as
are necessary.Comment: 18 pages, 3 figure
Transport of the Saharan dust air plumes over the tropical North Atlantic from FORMOSAT–3/COSMIC observation
AbstractLong–range transport of the Saharan dust plumes during May–August of each year is a prominent feature over the tropical North Atlantic. Observations of temperature profiles are highly desirable in clarifying the impacts of the Saharan dust plumes over the tropical North Atlantic. In this work we evaluate positive temperature anomalies (inversions in the lower troposphere) in the North Atlantic low troposphere originating from Western Africa, and to examine the correspondence of these events to Saharan dust plumes, using several temperature sources and satellite–detected measurements of Aerosol Index. We combine profiles of temperature observations from FORMOSAT–3/COSMIC (F3C) with aerosol observations from Ozone Monitoring Instrument (OMI) to provide direct evidence of the Saharan dust plumes modifying environmental stability. The F3C observations show good profile measurements compared with the radiosondes in the lower troposphere, with the average temperature differences less than 0.5K. The F3C results were also compared with the Aqua Advanced Infrared Radiation Sounder (AIRS) and meteorological analyses from the National Centers for Environmental Predictions (NCEP), the United Kingdom Met Office (UKMO), and the European Centre for Medium Range Weather Forecast (ECMWF). Our results show that hot air plumes are associated with the Saharan dust plumes during their transport across the tropical North Atlantic. There were eleven distinctive hot air plumes during May–August 2007 and 2008, respectively. These hot air plumes increase environmental temperatures below 5–km altitudes, with the maximum increase of 1–2K around 2–km. This leads to increase of environmental stability below 2–km altitudes and decrease of environmental stability between 2– and 5–km altitudes. By changing the vertical distribution of environmental stability, the Saharan dust plumes act to stabilize environmental air below 2–km while destabilize environmental air from 2– to 5–km altitudes. These results are distinctively presented in the F3C and AIRS observations but less obvious in the meteorological analyses
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