讲座题目：To Keep Sharing Or Not To Keep Sharing? – An Empirical Analysis On User Decision In Peer-to-peer Sharing Networks(是否继续共享？——对P2P文件共享网络中用户共享决定的实证研究)
讲座时间：2009年5月13日15：00~17：00
Peer-to-peer sharing networks have seen explosive growth. In these networks, sharing files is completely voluntary with no financial reward for the contributing user. Yet many users continue to share despite the massive free riding by others. Using a large scale peer-to-peer individual music sharing data set, we seek to understand users’keep-sharingbehavior as private contribution to a public good using two theories: Generalized Exchange Theory, i.e., the more people benefit from the public good, the more they tend to contribute, and the Impure Altruism Theory, i.e., they contribute to the public good because their contribution is valued. We find that both theories are supported in driving users’ decision to keep sharing. More interestingly, in variables that can be compared, our results suggest that the marginal impact of the benefit received by the user dominates that of the benefit the user provides to the network on users’ keep-sharing decisions most of the time, even when we divide the sharers in groups based on their sharing times.
P2P共享网络最近发展很快。在这些网络中，文件共享是用户完全自愿的而且没有任何经济上的回报。即使这样，而且在大量的用户只是免费下载的环境中，很多用户还是继续共享。通过分析一个大规模的P2P网络中用户行为的数据，我们试图以两种解释私人提供公共商品的理论来理解用户继续共享的行为：广义的交换，也就是当人们从一个公共商品得到的利益越多，他们就会倾向于向它贡献更多；不纯的利他主义，也就是用户付出是因为他们的贡献是被认为有价值的。我们发现这两种解释用户继续共享的理论都被支持。更有趣的是，在那些可以比较的变量中，我们发现用户得到的利益对共享行为的边际影响大于他们向网络提供的价值对共享行为的边际影响。我们的结论在把共享者按活跃程度分组逐个分析后仍然成立
夏木博士现为University of Illinois at Urbana-Champaign大学美国伊利诺伊大学(University of Illinois at Urbana-Champaign) 商学院商业管理系信息系统方向助理教授。他于2001年获得美国德克萨斯大学奥斯汀分校商学院管理科学和信息系统博士学位，师从Andrew B. Whinston教授。
他的研究兴趣主要集中在网上社区的经济学，开源和电子商务标准开发与采纳，B2B电子商务和组合拍卖。他的论文发表在下列著名的国际学术期刊：Journal of Management Information Systems, European Journal of Operational Research,Decision Support Systems, Electronic Markets,International Journal of Electronic Commerce,Communications of the ACM,Information Technology and International Development,and theTransportation Research Record.他还在Information Systems and e-Business Management期刊担任编委。
夏木博士还在INFORMS, Workshop on e-Business, International Conference of Electronic Commerce 担任程序委员会成员。在伊利诺伊大学，他曾多次获得教师研究奖。
