Selective Just-In-Time (JIT) Information Propagation in Large Network-Centric Environments

对于诸如WWW和分布式异构系统的环境，高效和有效的变化检测和通知变得越来越重要。结构化数据的变化检测已经得到了广泛的研究。本项目的目标是对HTML和XML文档形式的非结构化数据进行更改检测和通知。本提案的目标是调查规范、管理和及时传播用户要求的变更，并满足服务质量要求。允许用户以不同的粒度级别指定他/她感兴趣的文档更改类型。它们还指定了需要通知他们的方式（电子邮件、移动的主机、PDA等）当所请求的信息变得可用时。服务质量（QoS）信息，如定时约束，聚合与个体变化是用户规范的一部分。用户规范被转换为一组规则，用于提取文档、监视更改和传播相关信息。特别注意可伸缩性问题，因为它是解决方案的一个重要方面。有选择地监视和了解更改（推送）的能力增强了当前定期提取信息和检查感兴趣的更改的策略。通过在互联网上传播所产生的原型和结果，科学家可以从中受益。通过将研究纳入UTA教授的课程和学生研究，该项目将影响UTA和其他大学的教育。

Efficient and effective change detection and notification is becoming increasingly important for environments such as WWW and distributed heterogeneous systems. Change detection for structured data has been studied extensively. Change detection and notification for unstructured data in the form of html and XML documents is the goal of this project. The objectives of this proposal are to investigate the specification, management, and propagation of changes as requested by a user in a timely manner, and meeting the quality of service requirements. The user is allowed to specify the kind of changes to documents s/he is interested in, at different levels of granularity. They also specify how they need to be notified (email, mobile host, PDA, etc.) when the requested information becomes available. Quality of service (QoS) information such as timing constraints, aggregated vs. individual changes is part of the user specification. User specifications are translated into a set of rules that are used for extracting documents, monitoring changes, and propagation of relevant information. Special attention is paid to scalability issues, as it is an important aspect of the solution. The ability to selectively monitor and be informed of changes (push) augments the current strategy of pulling information periodically and checking for interesting changes. By disseminating the resulting prototype and the results over the Internet, scientists can benefit from it. Through integration of research into courses taught at UTA and into student research, this project will impact education at UTA and other universities.