情報エージェントの枠組みによるWeb情報変化の監視と表示

抄録

Web repositories are exposed in form of a huge amount of heterogeneous information sources. The information is overwhelming the users. Besides the target information itself, the changes upon the previously released information are significant and worth being notified to those who perceived the out of date information as soon as possible. The changes made in Web repositories occur at unpredictable rates. Unfortunately, stock type information source has no means to inform its prospective users about the changes. While the stock type information source occupies a large percentage of sources on the Web, it is necessary to have a system that monitors changes on the Web, and provides comprehensive presentation to the prospective users. In this thesis, the author proposes a mechanism that provides change monitoring and presentation service for a large group of users based on coalition among service agents. The service agents keep improving the overall utilization factor by several schemes based on the decision made by game analysis. The author apply a cost model to the service mechanism in order to study the cooperative behavior of the service agents. The reduction of cost is designed to comply with the level of cooperation among service agents. As a result, when the proposed monitoring service is used among users, the Web repositories will virtually turn into flow type information system where the information of changes automatically flows to the users who are interested. This lets the information providers update their information pages and be confident that the pu to date information will be delivered to the potential users shortly after the actions.