| Summary: | 碩士 === 國立嘉義大學 === 資訊工程研究所 === 91 === With great advances in the mobile technology and wireless communications, users expect to access the Internet anytime anywhere. However, the resources on the mobile devices (limited computation, storage, communicational capability and battery life) and wireless links (limited and variant bandwidth, high error rate, high communication cost and changing quality of services) are obviously inferior to the fixed peers. Traditionally, two typical approaches for information dissemination are Pull and Push. In the Pull approach, users have to explicitly send out requests to the servers when they need the data. By contract, in the Push approach, the users will automatically get updated information after previous subscription with related servers. To save limited resources on the mobile devices and wireless links, actively push updated information from the server to the mobile subscribers would be a good choice. However, due to particularities of mobile communications, kinds of challenges, such as changing location and frequent disconnections of the mobile users, complicated user interfaces for different capabilities of mobile devices, and sophisticated server facilities to filter content and to trigger associated procedures for demanding users, are partially solved to achieve pushing timely information to the mobile users. In this thesis, an Agent-based mobile push system for delivering updated information to the mobile subscriber is developed. Also, an Intelligent Cache Management scheme with dynamically adaptive capability is designed for efficiently managing coherency between Agent and Server. By using the proposed push system, mobile users can obtain updated information with personalized content and customized presentation anytime anywhere using any available devices.
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