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The effect of electron density distribution on the waveform of an electromagnetic pulse through an inhomogeneous plasma region is analyzed. Assuming the electron density is assumed to vary in the direction normal to the plasma interface, WKB method is used to compute the transfer function of the plasma region in frequency domain and the fast Fourier transform algorithm is applied to obtain the distortion...
This paper aims at developing a decision tree model to predict student performance in engineering dynamics - a high-enrollment, high-impact, and core engineering course. This study is innovative because no prior literature exists on the same topic. Three research contributions are made: 1) Nine ??if-then?? decision rules were generated to predict student performance in engineering dynamics. 2) It...
This paper has studied the frequency band characteristics of the piezoelectric/piezomagnetic layered periodic composites. Both piezoelectric and piezomagnetic materials are assumed to be transversely isotropic. The displacement transfer coefficients of all the scattered waves are calculated by the transfer matrix and the stiffness matrix methods. Numerically calculated results show that the band structures...
According to the human cognitive process of text understanding, text cognitive function is proposed to describe the capability of text understanding, which can be expressed by an addition of various extracted keywords and relations among keywords. Text energy and text information are defined as two characteristics in text understanding in order to measure the acquired textual information and the reader-consumed...
The characteristics of scientific text topics discovery in e-science semantic grid environment is given firstly, and then a novel method about scientific text topics discovery is proposed. Thirdly the mean function of distances between topics to evaluate the scientific text topics discovery process is also presented. Finally, we adopt the texts of GCC2003 to prove that the proposed method has the...
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