808 research outputs found
The difficult coughing child: prolonged acute cough in children
Cough is one of the most common symptoms that patients bring to the attention of primary care clinicians. Cough can be designated as acute (<3 weeks in duration), prolonged acute cough (3 to 8 weeks in duration) or chronic (> 8 weeks in duration). The use of the term ‘prolonged acute cough’ in a cough guideline allows a period of natural resolution to occur before further investigations are warranted. The common causes are in children with post viral or pertussis like illnesses causing the cough. Persistent bacterial bronchitis typically occurs when an initial dry acute cough due to a viral infection becomes a prolonged wet cough remaining long after the febrile illness has resolved. This cough responds to a completed course of appropriate antibiotics
Simulation of non-stationary and non-Gaussian random processes by 3rd-order Spectral Representation Method: Theory and POD implementation
This paper introduces the -order Spectral Representation Method for
simulation of non-stationary and non-Gaussian stochastic processes. The
proposed method extends the classical -order Spectral Representation
Method to expand the stochastic process from an evolutionary bispectrum and an
evolutionary power spectrum, thus matching the process completely up to
third-order. A Proper Orthogonal Decomposition (POD) approach is further
proposed to enable an efficient FFT-based implementation that reduces
computational cost significantly. Two examples are presented, including the
simulation of a fully non-stationary seismic ground motion process,
highlighting the accuracy and efficacy of the proposed method.Comment: 38 pages, 9 figures, 2 table
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