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After analyzing the curvature expression, the inflection points were given by the known planar cubic Bezier control polygon information. Based on that, we proposed an algorithm that can quickly and accurately obtain the shape characteristic points of curve. Experimental results show that the algorithm is rapid, accurate, and robust.
A parametric approach, based on a canonical form of the singular matrix pencils and a result about the regularizability of linear descriptor systems, is proposed for infinite eigenvalue assignment (IEVA) in linear, continuous and time-invariant descriptor systems via proportional plus derivative state feedback. When the input and state vectors have the same dimension, it is proved that there are solutions...
Spatial hypersurface plays a very important role in the classification problem. In SVM, classification hypersurface is emphasized because of the direct induction of the support vectors, so the hypersurface reflecting the relation between categorical attribute and condition attributes acquired by SVM promotes the classification effect. In traditional SVM solution algorithms, objective function is a...
The electronic mail (e-mail) concept makes it possible to communicate with many people in an easy and cheap way. Though email brought us such huge convenience, it also caused us trouble of managing the large quantities of spam mails received everyday. Without appropriate counter-measures, the situation seems to be worsening and spare email will eventually undermine the usability of email. To efficiently...
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