Studies on Cooperative Information Systems

本研究的目的是实现分布式协同工作环境，以整合和利用分布在网络上的各种信息资源。本研究的主题是探讨分布式异构多媒体信息的协同互操作性，并通过扩展面向对象模型对协同信息系统进行建模。1998年，为虚拟办公应用系统设计了环境动态更新机制。协同系统中的事务比传统事务需要更细致的控制和灵活性。提出了一种实现这种事务的新方法。我们还研究了数据仓库相关技术的发展趋势，提出了研究社区的指导方针，开发了一种新的视图更新方法，提高了传统解决方案的效率，并设计和实现了一个协作超媒体系统的动作历史视图功能。 ...更多信息 作为开发诸如远程教育系统和虚拟办公室系统的应用系统的平台的多媒体协同处理系统的开发已经进行，并且通过使用实验获得了来自用户的反馈。本文还研究了支持个性化的多媒体数据库互操作性的扩展和基于面向对象数据库视图功能扩展的多媒体信息系统模型。该模型与我们的合作超媒体系统的架构。此外，还研究了在协同系统中利用数据仓库技术、提高协同处理的效率和确保正确性的并行处理等，2000年，我们整合了有关协同信息系统的研究成果，将其重新整理为开发实用协同系统的基本技术。首先，设计、实现了一种协同超媒体系统中工作状态转换的管理机制，并对其进行了评价。它表明，该机制减少了工作管理器的操作负荷，并支持具有复杂工作状态的协同工作。其次，将行动历史观机制融入我国教育支持系统，并在实践中加以运用。很明显，行动历史观机制在教育系统等实际应用中是有用的。研究了提高WWW缓存命中率的方法，提出了Web仓库的概念，它将WWW技术和数据仓库技术结合起来，提供了对WWW数据更高级的利用。少

This research aims at realizing distributed cooperative work environments for integrating and utilizing various information resources distributed among networks. Themes of this research include pursuing cooperative interoperability of distributed heterogeneous multimedia information and modeling cooperative information systems by extending object-oriented model.In 1998, mechanisms for dynamic updating of environments are designed for a virtual office application system. Transaction in cooperative systemsare required more detailed control and flexibility than conventional transactions. A new method that realizes such tranactions has been developed. We also have exarnined trends in technologies related to data warehouse, made a submission about guidelines for the research community, developed a new method for view update that improves in efficiency of conventional solutions, and designed and implemented an action history view function on a cooperative hypermedia system.In 1999, the devel … More opment of a multimedia cooperative processing system that is a platform for development of application systems such as a distance education system and a virtual office system has proceeded, and feedback from users was obtained by experiments about usage. We also studied extension of interoperability in multimedia databases supporting personalization for each user and a model for multimedia information systems based on extension of view functions of object-oriented databases. The model was incorporated with the architecture of our cooperative hypermedia system. In addition to these, utilization of a data warehouse technology in cooperative systems and parallel processing for increasing efficiency and a guarantee of correctness in cooperative processing were studied.In 2000, we have integrated our research results about cooperative information systems, reorganized them as basic techniques for developing practical cooperative systems. First, a mechanism for management of transitions of working status in a cooperative hypermedia system was designed, implemented, and evaluated. It shows that the mechanism decreases a operating load of work managers and supports cooperative work that has complex working statuses. Secondly, we integrated action history view mechanisms into our education support system and used the system in practice. It became clear that the action history view mechanisms are useful in practical application such as education systems. We also studied methods for raising WWW cache hit-rate and proposed a new concept web-warehouse, which integrates WWW and data warehouse technologies and provides more advanced utilization of WWW data. Less