信息共享的统计模型：社区、成员和内容
Statistical Modelling of Information Sharing: Community, Membership and Content
摘要：
文件共享系统，像许多在线和传统的信息共享社区（如新闻组，BBS，论坛，兴趣俱乐部），是动态系统的性质。随着对等体进入和离开系统，由当前成员提供的信息内容在数量和组成上不断变化，这反过来又影响所有对等体的加入/离开决策。因此，成员和信息内容的动态是密切相关的，这表明了有关增长、维持和稳定的有趣问题。在本文中，我们建议研究这样的社区与一个简单的统计模型的信息共享俱乐部。同伴们携带着他们私人的信息商品作为俱乐部的潜在供应，根据他们所需要的信息是否可用来加入或离开俱乐部。信息商品是分块和类型的，就像在文件共享系统中，同行贡献不同的文件，或者在论坛中，消息按主题或线程分组。对等体的需求和供应的特点，然后在类型域的统计分布。这个模型揭示了有趣的临界行为与多重平衡。一个尖锐的增长阈值的推导：俱乐部可能会增长到一个可持续的平衡，只有当一个序参数的值是在阈值之上，否则萎缩到空。序参量是复合的，包括同行人口规模，他们的贡献供应的水平，俱乐部的信息搜索效率，在类型域的供应和需求的传播，以及它们之间的匹配的良好性。
英文摘要：
File-sharing systems, like many online and traditional information sharing communities (e.g. newsgroups, BBS, forums, interest clubs), are dynamical systems in nature. As peers get in and out of the system, the information content made available by the prevailing membership varies continually in amount as well as composition, which in turn affects all peers' join/leave decisions. As a result, the dynamics of membership and information content are strongly coupled, suggesting interesting issues about growth, sustenance and stability. In this paper, we propose to study such communities with a simple statistical model of an information sharing club. Carrying their private payloads of information goods as potential supply to the club, peers join or leave on the basis of whether the information they demand is currently available. Information goods are chunked and typed, as in a file sharing system where peers contribute different files, or a forum where messages are grouped by topics or threads. Peers' demand and supply are then characterized by statistical distributions over the type domain. This model reveals interesting critical behaviour with multiple equilibria. A sharp growth threshold is derived: the club may grow towards a sustainable equilibrium only if the value of an order parameter is above the threshold, or shrink to emptiness otherwise. The order parameter is composite and comprises the peer population size, the level of their contributed supply, the club's efficiency in information search, the spread of supply and demand over the type domain, as well as the goodness of match between them.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
