基于有限匹配与择优选取的大众生产系统演化研究

Evolution of Peer Production System Based on Limited Matching and Preferential Selection

基于维基百科作为典型大众生产系统以及众多用户参与编辑的现实背景,考虑到用户编辑行为的"择优"和"有限匹配"的特征,给出大众生产系统的"择优选取"和"有限匹配"规则以及演化模型,采用计算实验的方法,对大众生产系统演化中的页面编辑次数、页面与用户状态变化、匹配度影响等进行全面分析.实验结果表明:在"择优选取"和"有限匹配"两个原则的作用下,维基百科系统逐渐演化到稳定状态.在稳定状态下,页面被编辑次数服从幂律分布;用户状态与页面状态之差(即匹配度)趋向于零;用户与页面的匹配度越大,幂律分布的幂指数就越小,从而幂律分布的"尾巴"就越长.

Based on the real background of Wikipedia adopted as a classic peer production system and many users taking part in its editing, the two characteristics of preferential selection and limited matching during the editing process were considered. Two rules for ＂preferential selection＂ and ＂limited matching＂ and the evolving model of peer production system were presented. The analysis was based on computational experiments on the times of page editing, the status variation of pages and users, the affection of matching degree on page editing times, etc. The computational experiments show that the Wikipedia system evolves to a stable status under the action of the two rules. In the stable status, the times of page editing follow power-law distribution the difference between user＇s status and page status（i, e. the matching degree）is toward to zero the larger the matching degree of user and page, the smaller the power index of power-law distribution, so the longer the tail of power-law distribution.