7,682 research outputs found
Extraction of hidden information by efficient community detection in networks
Currently, we are overwhelmed by a deluge of experimental data, and network
physics has the potential to become an invaluable method to increase our
understanding of large interacting datasets. However, this potential is often
unrealized for two reasons: uncovering the hidden community structure of a
network, known as community detection, is difficult, and further, even if one
has an idea of this community structure, it is not a priori obvious how to
efficiently use this information. Here, to address both of these issues, we,
first, identify optimal community structure of given networks in terms of
modularity by utilizing a recently introduced community detection method.
Second, we develop an approach to use this community information to extract
hidden information from a network. When applied to a protein-protein
interaction network, the proposed method outperforms current state-of-the-art
methods that use only the local information of a network. The method is
generally applicable to networks from many areas.Comment: 17 pages, 2 figures and 2 table
Trends in the Health of Older Californians: Data From the 2001, 2003 and 2005 California Health Interview Surveys
Analyzes trends in the health status and use of preventive services among Californians age 65 and over by race/ethnicity, insurance type, and region. Reports rises in doctor visits and in cancer, diabetes, high cholesterol, obesity, and other illnesses
Evaluation of a Perceptually-Based Model of "Punch" with Music Material
This paper evaluates a perceptually motivated objective model for the measurement of “punch” in musical signals. Punch is a perceptual attribute that is often used to characterize music that conveys a sense of dynamic power or weight. A methodology is employed that combines signal separation, onset detection, and low level parameter measurement to produce a perceptually weighted “punch” score. The model is evaluated against subjective scores derived through a forced pairwise comparison listening test using a wide variety of musical stimuli. The model output indicates a high degree of correlation with the subjective scores. Correlation results are also compared to other objective models such as Crest Factor, Inter-Band-Ratio (IBR), Peak-to-Loudness Ratio (PLR), and Loudness Dynamic Range (LDR)
Hybrid Multiresolution Analysis Of ‘Punch’ In Musical Signals
This paper presents a hybrid multi-resolution technique for the extraction and measurement of attributes contained within a musical signal. Decomposing music into simpler percussive, harmonic and noise components is useful when detailed extraction of signal attributes is required. The key parameter of interest in this paper is that of punch. A methodology is explored that decomposes the musical signal using a critically sampled constant-Q filterbank of quadrature mirror filters (QMF) before adaptive windowed short term Fourier transforms (STFT). The proposed hybrid method offers accuracy in both the time and frequency domains. Following the decomposition transform process, attributes are analyzed. It is shown that analysis of these components may yield parameters that would be of use in both mixing/mastering and also audio transcription and retrieval
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Model independent H(z) reconstruction using the cosmic inverse distance ladder
Efficient computation of matched solutions of the Kapchinskij-Vladimirskij envelope equations for periodic focusing lattices
A new iterative method is developed to numerically calculate the periodic,
matched beam envelope solution of the coupled Kapchinskij-Vladimirskij (KV)
equations describing the transverse evolution of a beam in a periodic, linear
focusing lattice of arbitrary complexity. Implementation of the method is
straightforward. It is highly convergent and can be applied to all usual
parameterizations of the matched envelope solutions. The method is applicable
to all classes of linear focusing lattices without skew couplings, and also
applies to all physically achievable system parameters -- including where the
matched beam envelope is strongly unstable. Example applications are presented
for periodic solenoidal and quadrupole focusing lattices. Convergence
properties are summarized over a wide range of system parameters.Comment: 20 pages, 5 figures, Mathematica source code provide
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Stemness factor Sall4 is required for DNA damage response in embryonic stem cells.
Mouse embryonic stem cells (ESCs) are genetically more stable than somatic cells, thereby preventing the passage of genomic abnormalities to their derivatives including germ cells. The underlying mechanisms, however, remain largely unclear. In this paper, we show that the stemness factor Sall4 is required for activating the critical Ataxia Telangiectasia Mutated (ATM)-dependent cellular responses to DNA double-stranded breaks (DSBs) in mouse ESCs and confer their resistance to DSB-induced cytotoxicity. Sall4 is rapidly mobilized to the sites of DSBs after DNA damage. Furthermore, Sall4 interacts with Rad50 and stabilizes the Mre11-Rad50-Nbs1 complex for the efficient recruitment and activation of ATM. Sall4 also interacts with Baf60a, a member of the SWI/SNF (switch/sucrose nonfermentable) ATP-dependent chromatin-remodeling complex, which is responsible for recruiting Sall4 to the site of DNA DSB damage. Our findings provide novel mechanisms to coordinate stemness of ESCs with DNA damage response, ensuring genomic stability during the expansion of ESCs
MOE11 Emittance Growth from the Thermalization of Space-Charge Nonuniformities
Beams injected into a linear focusing channel typically have some degree of
space-charge nonuniformity. In general, injected particle distributions with
systematic charge nonuniformities are not equilibria of the focusing channel
and launch a broad spectrum of collective modes. These modes can phase-mix and
have nonlinear wave-wave interactions which, at high space-charge intensities,
results in a relaxation to a more thermal-like distribution characterized by a
uniform density profile. This thermalization can transfer self-field energy
from the initial space-charge nonuniformity to the local particle temperature,
thereby increasing beam phase space area (emittance growth). In this paper, we
employ a simple kinetic model of a continuous focusing channel and build on
previous work that applied system energy and charge conservation quantify
emittance growth associated with the collective thermalization of an initial
azimuthally symmetric, rms matched beam with a radial density profile that is
hollowed or peaked. This emittance growth is shown to be surprisingly modest
even for high beam intensities with significant radial structure in the initial
density profile.Comment: Paper MOE11, XX International Linac Conference, Monterey, CA 21-25
August 2000 3 pages, 3 figure
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