The quantitative relationship among availability of clusters,availability of server,data replica distribution and the number of servers in clusters had been measured and a series of theory including a formula which can provide accurate evaluation of cluster servers′ availability ha.

By the method of estimating the probability distribution of training examples,a new and simple method of dealing with numeric attribute based on example distribution and entropy is turned out.

Effects of system imperfection on polarization scattering measurement of distributed targets;

Based on the analysis,"the echo data mathematic model" is built,the unthors author then propose "the method of echo data simulation based on the stochastic distributed target",based on which the authors further set forth a method of creating raw data different from the conventional one,whose availability is validated by modeling and simulating.