13,938 research outputs found
High Accuracy Human Activity Monitoring using Neural network
This paper presents the designing of a neural network for the classification
of Human activity. A Triaxial accelerometer sensor, housed in a chest worn
sensor unit, has been used for capturing the acceleration of the movements
associated. All the three axis acceleration data were collected at a base
station PC via a CC2420 2.4GHz ISM band radio (zigbee wireless compliant),
processed and classified using MATLAB. A neural network approach for
classification was used with an eye on theoretical and empirical facts. The
work shows a detailed description of the designing steps for the classification
of human body acceleration data. A 4-layer back propagation neural network,
with Levenberg-marquardt algorithm for training, showed best performance among
the other neural network training algorithms.Comment: 6 pages, 4 figures, 4 Tables, International Conference on Convergence
Information Technology, pp. 430-435, 2008 Third International Conference on
Convergence and Hybrid Information Technology, 200
NBLDA: Negative Binomial Linear Discriminant Analysis for RNA-Seq Data
RNA-sequencing (RNA-Seq) has become a powerful technology to characterize
gene expression profiles because it is more accurate and comprehensive than
microarrays. Although statistical methods that have been developed for
microarray data can be applied to RNA-Seq data, they are not ideal due to the
discrete nature of RNA-Seq data. The Poisson distribution and negative binomial
distribution are commonly used to model count data. Recently, Witten (2011)
proposed a Poisson linear discriminant analysis for RNA-Seq data. The Poisson
assumption may not be as appropriate as negative binomial distribution when
biological replicates are available and in the presence of overdispersion
(i.e., when the variance is larger than the mean). However, it is more
complicated to model negative binomial variables because they involve a
dispersion parameter that needs to be estimated. In this paper, we propose a
negative binomial linear discriminant analysis for RNA-Seq data. By Bayes'
rule, we construct the classifier by fitting a negative binomial model, and
propose some plug-in rules to estimate the unknown parameters in the
classifier. The relationship between the negative binomial classifier and the
Poisson classifier is explored, with a numerical investigation of the impact of
dispersion on the discriminant score. Simulation results show the superiority
of our proposed method. We also analyze four real RNA-Seq data sets to
demonstrate the advantage of our method in real-world applications
Electronic Structure and Linear Optical Properties of SrCuOCl Studied from the First Principles Calculation
First-principles calculations with the full-potential linearized augmented
plane-wave (FP-LAPW) method have been performed to investigate detailed
electronic and linear optical properties of SrCuOCl, which is
a classical low-dimensional antiferromagnet (AFM) charge transfer ({\it CT})
insulator. Within the local-spin-density approximation (LSDA) plus the on-site
Coulomb interaction (LADA+) added on Cu 3d orbitals, our calculated band
gap and spin moments are well consistent with the experimental and other
theoretical values. The energy dispersion relation agrees well with the angle
resolved photoemission measurements. Its linear optical properties are
calculated within the electric-dipole approximation. The absorption spectrum is
found to agree well with the experimental result.Comment: 5 pages, 5 figure
Oscillation death in coupled counter-rotating identical nonlinear oscillators
We study oscillatory and oscillation suppressed phases in coupled
counter-rotating nonlinear oscillators. We demonstrate the existence of limit
cycle, amplitude death, and oscillation death, and also clarify the Hopf,
pitchfork, and infinite period bifurcations between them. Especially, the
oscillation death is a new type of oscillation suppressions of which the
inhomogeneous steady states are neutrally stable. We discuss the robust neutral
stability of the oscillation death in non-conservative systems via the
anti-PT-symmetric phase transitions at exceptional points in terms of
non-Hermitian systems.Comment: 7 pages, 4 figure
- …