Studies on Multimedia Database Systems with Advanced View Functions

在第一年，我们形式化了高级视图的概念，并研究了用于高效视图计算的索引方法。在第二年，我们提出了一个名地网函数框架，这些函数对于构建从数据库中检索结果的图形用户界面非常重要。基于该框架，我们对一个实验系统进行了评估。第三年，也就是最后一年，我们实现了一个原型系统，以地理数据库作为实验数据库，证明了我们的方法是有用和实用的。主要结果如下：1.基于数据库视图的虚拟超媒体我们提出了一个集成数据库视图和图形用户界面的视图组件的通用模型。2.生成用户需求和显示限制之间的折衷的图形交互对象。我们形成了一种机制，根据分配给从数据库中检索的数据的类的重要性级别来控制显示数据量。3.并发工作环境中的命名放置功能4.一种利用数据库查询形成过程的重用来生成交互地图的环境。我们形式化了一个框架，以改善包括歧义在内的简单查询，5.协同工作环境下产生的数据的语义约束完整性和高效处理方法。我们研究了一种在协同工作环境中生成复杂视图的有效方法。6.高效的数据库视图查询处理如果我们提出的物化视图的“超级关键条件”得到满足，则保证物化视图的更新过程是高效的。

In the first year, we formalized advanced view concepts, and studied indexing methods for efficient view computations. In the second year, we presented a framework of name placemenet functions which are important for constructing graphical user interfaces to retriere results from databases. We clso evaluated an experimental system based on the framwork. In the third year, the final year, we implemented a prototype system to prove that our approach are useful and practical using geographic databases as experimental databases.Major results are as follows.1.Virtual Hypermedia Based on Database ViewsWe presented a general model to integrate database views and view components of Graphical User Interfaces.2.Generation of Graphical Interactive Objects with Compromises between Users' Requirements and Display Limits.We formaized a mechanism to control the amount of display data according to importance levels assigned to classes which are data retrieved from databases.3.Name Placement Functions for Concurrent Work EnvironmentsThe concept of a concurrent work environment is introduced and a prototype system is developed for executing name placement functions after retrieving from databases.4.An Environment of Generating Interacitve Maps Utilizing Reuses of Database Query Formation Process.We formalized a framwork to improve naive queries including ambiguity, errors, and incompleteness into feasible queries using knowledge-bases concerning map productions.5.Semantic Constraints Intergrity and Efficient Processing Methods for Data Produced in Cooperative Work Environments.We studied am efficient method to generate complex views in cooperative work environments.6.Efficient Query Processing for Views of DatabasesIf "super key conditions" are satisfied, which we proposed, for materialize views, update processes of the materialized views are guaranteed to be efficient.