29,603 research outputs found
Investigation of Frame Alignments for GMM-based Digit-prompted Speaker Verification
Frame alignments can be computed by different methods in GMM-based speaker
verification. By incorporating a phonetic Gaussian mixture model (PGMM), we are
able to compare the performance using alignments extracted from the deep neural
networks (DNN) and the conventional hidden Markov model (HMM) in digit-prompted
speaker verification. Based on the different characteristics of these two
alignments, we present a novel content verification method to improve the
system security without much computational overhead. Our experiments on the
RSR2015 Part-3 digit-prompted task show that, the DNN based alignment performs
on par with the HMM alignment. The results also demonstrate the effectiveness
of the proposed Kullback-Leibler (KL) divergence based scoring to reject speech
with incorrect pass-phrases.Comment: accepted by APSIPA ASC 201
Building eResearch Services, Capabilities and Capacity
The Queensland University of Technology (QUT) is known for several flagship eResearch centres. It also has a number of mature, centralised research support services that address a several of areas of eResearch. The university has openly stated its aspiration to be an institution with a strongly embedded eResearch capability and to this end it has expressed the desire to establish a university-wide eResearch support service. However, articulating this desire is much easier than realising it. During 2008 QUT undertook a major review into eResearch that made recommendations on the development of university-wide eResearch support service and the building of eResearch capabilities and capacity throughout the university. The results of this review were reported last year at this conference. In 2009, QUT is progressing a second, follow-on project – Building eResearch Support Capability and Capacity. It has been designed to build upon existing strengths in HPC, repositories, data management, and the delivery of integrated skills for eresearch. The purpose of this presentation is to give an update on QUT’s journey, one year on from its first major report into eResearch. It will outline how the university is approaching this challenge, the current work being carried out and the strategies being employed. We will also discuss the lessons learned
Developing research data management services at QUT
QUT Library and the High Performance Computing and Research Support (HPC) Team have been collaborating on developing and delivering a range of research support services, including those designed to assist researchers to manage their data. QUT’s Management of Research Data policy has been available since 2010 and is complemented by the Data Management Guidelines and Checklist. QUT has partnered with the Australian Research Data Service (ANDS) on a number of projects including Seeding the Commons, Metadata Hub (with Griffith University) and the Data Capture program. The HPC Team has also been developing the QUT Research Data Repository based on the Architecta Mediaflux system and have run several pilots with faculties. Library and HPC staff have been trained in the principles of research data management and are providing a range of research data management seminars and workshops for researchers and HDR students
Geographically intelligent disclosure control for flexible aggregation of census data
This paper describes a geographically intelligent approach to disclosure control for protecting flexibly aggregated census data. Increased analytical power has stimulated user demand for more detailed information for smaller geographical areas and customized boundaries. Consequently it is vital that improved methods of statistical disclosure control are developed to protect against the increased disclosure risk. Traditionally methods of statistical disclosure control have been aspatial in nature. Here we present a geographically intelligent approach that takes into account the spatial distribution of risk. We describe empirical work illustrating how the flexibility of this new method, called local density swapping, is an improved alternative to random record swapping in terms of risk-utility
Structure and Kinematics of Molecular Disks in Fast-Rotator Early-Type Galaxies
We present interferometric observations resolving the CO emission in the four
gas-rich lenticular galaxies NGC 3032, NGC 4150, NGC 4459, and NGC 4526, and we
compare the CO distribution and kinematics to those of the stars and ionized
gas. Counterrotation documents an external origin for the gas in at least one
case (NGC 3032), and the comparisons to stellar and ionized gas substructures
in all four galaxies offer insights into their formation histories. The
molecular gas is found in kpc-scale disks with mostly regular kinematics and
average surface densities of 100 to 200 \msunsqpc. The disks are well aligned
with the stellar photometric and kinematic axes. In the two more luminous Virgo
Cluster members NGC 4459 and NGC 4526 the molecular gas shows excellent
agreement with circular velocities derived independently from detailed modeling
of stellar kinematic data. There are also two puzzling instances of
disagreements between stellar kinematics and gas kinematics on sub-kpc scales.
In the inner arcseconds of NGC 3032 the CO velocities are significantly lower
than the inferred circular velocities, and the reasons may possibly be related
to the external origin of the gas but are not well understood. In addition, the
very young population of stars in the core of NGC 4150 appears to have the
opposite sense of rotation from the molecular gas.Comment: ApJ, accepte
A New Approach to the Problem of Dynamical Quarks in Numerical Simulations of Lattice QCD
Lattice QCD with an even number of degenerate quark flavours is shown to be a
limit of a local bosonic field theory. The action of the bosonic theory is real
and bounded from below so that standard simulation algorithms can be expected
to apply. The feasibility of such calculations is discussed, but no practical
tests have yet been made.Comment: pages 0-15, ps-file 147KB, preprint DESY 93-14
Experimental study of an independently deflected wingtip mounted on a semispan wing
The results of a subsonic wind tunnel test of a semispan wing with an independently deflected tip surface are presented and analyzed. The tip surface was deflected about the quarter chord of the rectangular wing and accounted for 17 percent of the wing semispan. The test was conducted to measure the loads on the tip surface and to investigate the nature of aerodynamic interference effects between the wing and the deflected tip. Results are presented for two swept tip surfaces of similar planform but different airfoil distributions. The report contains plots of tip lift, drag, and pitching moment for various Reynolds numbers and tip deflection angles with respect to the inboard wing. Oil flow visualization photographs for a typical Reynolds number are also included. Important aerodynamic parameters such as lift and pitching moment slopes and tip aerodynamic center location are tabulated. A discussion is presented on the relationship between tip experimental data acquired in a steady flow and the prediction of unsteady tip motion at fixed wing angles of attack
House Price-Volume Dynamics: Evidence from 12 Cities in New Zealand
Using a selected New Zealand urban area data set for the period 1994–2004, we examine price and volume dynamics using various house price indexing approaches. Applying the Granger causality test based on a vector error correction model (VECM), where seasonality is considered in the model by using seasonal dummy variables, we find that sale price and trading volume are cointegrated. Causality is caused by a long-run relationship rather than short-run dynamics between price and volume. The direction of causality for large cities is from volume to price. The results support the theory of frictional search models for housing markets in general.
Disk Growth in Bulge-Dominated Galaxies: Molecular Gas and Morphological Evolution
Substantial numbers of morphologically regular early-type (elliptical and
lenticular) galaxies contain molecular gas, and the quantities of gas are
probably sufficient to explain recent estimates of the current level of star
formation activity. This gas can also be used as a tracer of the processes that
drive the evolution of early-type galaxies. For example, in most cases the gas
is forming dynamically cold stellar disks with sizes in the range of hundreds
of pc to more than one kpc, although there is typically only 1% of the total
stellar mass currently available to form young stars. The numbers are still
small, but the molecular kinematics indicate that some of the gas probably
originated from internal stellar mass loss while some was acquired from
outside. Future studies will help to quantify the role of molecular gas
(dissipational processes) in the formation of early-type galaxies and their
evolution along the red sequence.Comment: 4 pages. To appear in the proceedings of IAU Symposium 245,
"Formation and Evolution of Galaxy Bulges," M. Bureau, E. Athanassoula, and
B. Barbuy, ed
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