Based on the scientific articles from the informatics journals,a author collaboration network model is presented.

Based on the collaboration ways of the authors,a author collaboration network model is presented.

On the basics of copyright law what is the work of joint authorship and what is its features are analyzed;then the ownership of copyright is discussed;at last the right of the co author and personal right is the main part are explained.

An approximate joint probability data association algorithm;

According to hydraulic structure model test results of the XXIX Olympiad sailing games,considering the probability characteristic of physical modeling and joint probability of different extreme sea combinations,the stochastic simulation technique is applied to the analysis of sea environmental conditions and their corresponding output.

This paper applies blind source separation(BSS) to analyze the noise of electric motor,makes use of the independence among the source signals to whiten the gathered signal,adopts a well used algorithm based on the joint probability statistics of the signal,and obtains the optimum rotation angle according to the direction derivative entropy of joint probability distribution minimum.