39,233 research outputs found
Comparison of two methods of noise power spectrum determinations of medical radiography systems
Noise in medical images is recognized as an important factor that determines the image quality. Image noise is characterized by noise power spectrum (NPS). We compared two methods of NPS determination namely the methods of Wagner and Dobbins on Lanex Regular TMG screen-film system and Hologic Lorad Selenia full field digital mammography system, with the aim of choosing the better method to use. The methods differ in terms of various parametric choices and algorithm implementations. These parameters include the low pass filtering, low frequency filtering, windowing, smoothing, aperture correction, overlapping of region of interest (ROI), length of fast Fourier transform, ROI size, method of ROI normalization, and slice selection of the NPS. Overall, the two methods agreed to the practical value of noise power spectrum between 10 -3-10-6mm2 over spatial frequency range 0-10mm-1
A New Hierarchical Redundancy Eliminated Tree Augmented Naive Bayes Classifier for Coping with Gene Ontology-based Features
The Tree Augmented Naive Bayes classifier is a type of probabilistic
graphical model that can represent some feature dependencies. In this work, we
propose a Hierarchical Redundancy Eliminated Tree Augmented Naive Bayes
(HRE-TAN) algorithm, which considers removing the hierarchical redundancy
during the classifier learning process, when coping with data containing
hierarchically structured features. The experiments showed that HRE-TAN obtains
significantly better predictive performance than the conventional Tree
Augmented Naive Bayes classifier, and enhanced the robustness against
imbalanced class distributions, in aging-related gene datasets with Gene
Ontology terms used as features.Comment: International Conference on Machine Learning (ICML 2016)
Computational Biology Worksho
Couplings and spectra in modular inflation
We analyze how the spectrum of perturbations produced in a multi-component
modular inflation model proposed by Kadota and Stewart depends on couplings
between the two moduli. Although some simple direct couplings give essentially
the same results as the original model, , simple
indirect couplings produce a power law spectrum, ,
which can naturally be close to scale invariant.Comment: 11 pages, format changed, some corrections of formula
Bondâslip Behavior of Fiber-reinforced Polymer/concrete Interface in Single Shear Pull-out and Beam Tests
It has been assumed that the fiber-reinforced polymer/concrete interface is subjected to in-plane shear condition when intermediate crack debonding failure occurs. Therefore, the single shear pull-out test results are often used to predict the intermediate crack debonding failure in beams. In this study, the behavior of fiber-reinforced polymer-strengthened concrete beams and single shear pull-out specimens were studied experimentally and numerically. The bondâslip behavior of the fiber-reinforced polymer/concrete interface was obtained by single shear pull-out and beam tests. In all beam specimens, a concrete wedge located at the edge of the notch detached with the fiber-reinforced polymer debonding failure. This phenomenon shows that the initiation of debonding is due to a diagonal crack formation close to the major flexural/shear crack inside the concrete. The diagonal crack formation is due to a local moment at the tip of the notch. This causes the different stress state and slip of the fiber-reinforced polymer/concrete interface of beam specimens from that of the pull-out specimens. It is found that the bondâslip relation obtained from the pull-out test does not represent the bondâslip relation of the fiber-reinforced polymer/concrete interface in the fiber-reinforced polymer-strengthened concrete beams, and it cannot be directly used for predicting the load capacity of the fiber-reinforced polymer-strengthened concrete beams
Empirical Determinations of Key Physical Parameters Related to Classical Double Radio Sources
Multi-frequency radio observations of the radio bridge of powerful classical
double radio sources can be used to determine: the beam power of the jets
emanating from the AGN; the total time the source will actively produce jets
that power large-scale radio emission; the thermal pressure of the medium in
the vicinity of the radio source; and the total mass, including dark matter, of
the galaxy or cluster of galaxies traced by the ambient gas that surrounds the
radio source. The theoretical constructs that allow a determination of each of
these quantities using radio observations are presented and discussed.
Empirical determinations of each of these quantities are obtained and analyzed.
A sample of 14 radio galaxies and 8 radio loud quasars with redshifts between
zero and two for which there is enough radio information to be able to
determine the physical parameters listed above was studied in detail.
(abridged)Comment: Submitted to ApJ, LaTex, 26 total pages of text which includes
captions & two tables, plus 13 EPS figures & 1 tabl
Fatigue Risks in the Connections of Sign Support Structures
This research effort develops a reliability-based approach for prescribing inspection intervals for mast-arm sign support structures corresponding to user-specified levels of fatigue-induced fracture risk. The resulting level of risk for a particular structure is dependent upon its geographical location, the type of connection it contains, the orientation of its mast-arm relative to north and the number of years it has been in service. The results of this research effort indicate that implementation of state-of-the-art reliability-based assessment procedures can contribute very valuable procedures for assigning inspection protocols (i.e. inspection intervals) that are based upon probabilities of finding fatigue-induced cracking in these structures. The engineering community can use the results of this research effort to design inspection intervals based upon risk and thereby better align inspection needs with limited fiscal and human resources
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