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Research on Pixel Unmixing based on Support Vector Machine
Yunfeng Liu,Laijun Lu 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.7
Through the research of the application of support vector machine theory in the pixel unmixing, the advantages of the weighted posterior probability support vector machine theory in pixel unmixing is presented. Considering the difference of each support vector machine classifier, posterior probability pixel is used as weight coefficient of sub-pixel classification for pixels unmixing. This paper presents a weighted posterior probability support vector machine mixed pixel unmixing method. This method not only has the nonlinear model decomposition characteristics of high precision, but also reduces the standard support vector machine calculating the amount of multi classifier, and it has strong adaptability.
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Shaoying Zheng,Longlong Fan,Erika Odendo,Laijun Liu,Danping Shi,Guizhong Li,Jun Chen,Liang Fang,Brahim Elouadi 한국물리학회 2014 Current Applied Physics Vol.14 No.1
Perovskite structure (1 x)BaTiO3exBiAlO3 (BTexBA, x ¼ 0.05, 0.08 and 0.1, corresponding to BTe5BA, BTe8BA and BTe10BA, respectively) ceramics were prepared by a solid state reaction route. Crystal structure of BTexBA ceramics was determined by using XRD. Dielectric properties were studied as a function of temperature at different frequencies, which indicated that the phase transition temperature (Tm) decreased with increasing x. With increasing temperature, thermal expansion dl/l increased while thermal expansion coefficient a had weak concentration dependence. The Burns temperature was much higher than the transition temperature Tm for the BTe5BA and BTe10BA ceramics. Polarization hysteresis loops (PeE), electrostrictive (SeE) and S versus P2 (SeP2) at different temperatures were displayed. Pmax slightly decreased due to thermally activated leakage current, meanwhile, Smax decreased at above Tm with the contribution of ferroelectric domain reorientation decreased. The electrostrictive coefficient Q value was clearly larger than that of lead-based electrostrictors at room temperature. Furthermore, it exhibited a slim loop with negligible hysteresis and a subtle linear feature at higher temperature.
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