Development of High-Level Query Processing Mechanisms for Networked Multimedia Databases

本文主要研究了利用分布在网络上的多媒体数据的技术问题。由于互联网上的数据库量急剧增加，很难从这样的环境中找到所需的数据。因此，需要高级搜索设施来解决这些问题。本研究的重点是地理数据，因为地理系统是多媒体数据库的典型应用。分布式网络上的数据往往包含一种地理信息，因此地图可以被认为是多媒体用户的重要接口。本文主要研究了以下三个主题，并开发了一个实用的系统，以实现对internet上数据的有效搜索机制。分解多媒体和超媒体数据的功能。从各种来源的数据组成用户需要的表示的功能。显示不能由2组成的数据的功能，并支持修改用户查询。对于媒体对象的分解/合成，需要了解对象的特征。复合对象是存在于时间或空间环境中的媒介对象。如果分解复合对象，则生成的对象也可以成为媒体对象。本研究还提出了同义表操作、查询干扰、查询生成过程重用和共存关系作为新同义表。为了减少生成地图的时间，开发了时间合成和并发合成机制。

This research has been studied on technical problems in order to utilize multimedia data distributed over networks. Since amount of database on internet increases drastically, it is difficult to find out required data from such environment. Hihg-level search facility is, therefore, required to solve the problems. This research focuses on geographic data, since a geographic system is a typical application of multimedia databases. Data over the distributed network often contain a kind of geographic information, so that maps can be considered as important interfaces for multimedia users.In this research, the following three topics have been studied, and a practical system has been developed in order to realize effective search mechanisms for data on internet.1.Function to decompose multimedia and hypermedia data.2.Function to compose usr-required representation from data of various source.3.Functions to display data which cannot be composed by 2 and to support modification of users query.For decomposition/composition of media objects, it is required to understand the characteristics of objects. Composite objects are media objects which exist on temporal or spatial environment. If a composite object is decomposed, resulting objects can be also become media objects. This research also proposed thesauruses operations, interference of queries, reutilization of query generation processes, and co-existence relationships as new thesauruses. In order to reduce the time to generate maps, temporal composition and concurrent composition mechanisms have been developed.