11,778 research outputs found
The effects of phonological regularity on writing of Hong Kong school-aged children
Thesis (B.Sc)--University of Hong Kong, 2005.A dissertation submitted in partial fulfilment of the requirements for the Bachelor of Science (Speech and Hearing Sciences), The University of Hong Kong, June 30, 2005.Also available in print.published_or_final_versionSpeech and Hearing SciencesBachelorBachelor of Science in Speech and Hearing Science
Smart Content Recognition from Images Using a Mixture of Convolutional Neural Networks
With rapid development of the Internet, web contents become huge. Most of the
websites are publicly available, and anyone can access the contents from
anywhere such as workplace, home and even schools. Nevertheless, not all the
web contents are appropriate for all users, especially children. An example of
these contents is pornography images which should be restricted to certain age
group. Besides, these images are not safe for work (NSFW) in which employees
should not be seen accessing such contents during work. Recently, convolutional
neural networks have been successfully applied to many computer vision
problems. Inspired by these successes, we propose a mixture of convolutional
neural networks for adult content recognition. Unlike other works, our method
is formulated on a weighted sum of multiple deep neural network models. The
weights of each CNN models are expressed as a linear regression problem learned
using Ordinary Least Squares (OLS). Experimental results demonstrate that the
proposed model outperforms both single CNN model and the average sum of CNN
models in adult content recognition.Comment: To be published in LNEE, Code: github.com/mundher/NSF
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Erratum: Detection of the A302S Rdl mutation in fipronil bait-selected strains of the German cockroach (Dictyoptera: Blattellidae) (Journal of Economic Entomology (2013) 106:5 (2167-2176) DOI: 10.1603/EC13119)
Generating on-the-fly large samples of theoretical spectra through N-dimensional grid
Many analyses and parameter estimations undertaken in astronomy require a
large set (> 10^5) of non-analytical, theoretical spectra, each of these
defined by multiple parameters. We describe the construction of an
N-dimensional grid which is suitable for generating such spectra. The
theoretical spectra are designed to correspond to a targeted parameter grid but
otherwise to random positions in the parameter space, and they are interpolated
on-the-fly through a pre-calculated grid of spectra. The initial grid is
designed to be relatively low in parameter resolution and small in occupied
hard disk space and therefore can be updated efficiently when a new model is
desired. In a pilot study of stellar population synthesis of galaxies, the mean
square errors on the estimated parameters are found to decrease with the
targeted grid resolution. This scheme of generating a large model grid is
general for other areas of studies, particularly if they are based on
multi-dimensional parameter space and are focused on contrasting model
differences.Comment: 7 pages, 5 figures, 1 table. Accepted for publication in A
Adsorption of sodium hexanoate on α-alumina.
Neutron reflection and adsorption isotherm measurements have been used to study the adsorption behaviour of hexanoic acid onto α-alumina surfaces. Importantly, the pH dependence of the behaviour has been characterised with a pronounced maximum in adsorption identified at a pH of approximately 5, close to the pKa of the acid. The adsorbed layer is identified as a bilayer, which is reasonable given the hydrophilic nature of both side of the layer, and has a thickness of 13 Å, suggesting significant extent of interdigitation. At pH 5, the layer has much lower extent of hydration relative to the higher pH of 7, consistent with the increased total adsorption at pH 5. A number of different mechanisms for the binding of the hexanoic acid to the surface are considered. The experimental data, combined with calculations using equilibrium/binding constants of the surface and ligands, indicates that a ligand exchange reaction may be the most significant mechanism.This is the author's accepted manuscript. The final version has been published by Elsevier in the Journal of Colloid and Interface Science here: http://www.sciencedirect.com/science/article/pii/S0021979713005560
Stellar Dynamics and Black Holes
Chandrasekhar's most important contribution to stellar dynamics was the
concept of dynamical friction. I briefly review that work, then discuss some
implications of Chandrasekhar's theory of gravitational encounters for motion
in galactic nuclei.Comment: Talk presented at the "Chandrasekhar Centenary Conference" (2010
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