User rank in one subject of network forum and trend analysis

Data of network forum is massive and instant. Topics are plentiful. So it challenges to compare the authority value of lots of users. There are many difference between academic paper rank and rank of users in network forum, such as scale in quality, usage, citation count, file length. Difference between user rank with web page is: clear link relation in web but not in network forum, mutual-reinforcement is right for web not supported by network forum. This paper describes a PersonRank method, which ranks users in a subject, measures activity degree and influence to the subject´s life efficiently.