Studies on Object Oriented Data Models for High-Level Database Applications

由于数据库应用领域的扩大，需要新的面向高级应用的数据库系统来处理图像、语音、软件、知识等多媒体数据及其关系。在我们的研究项目中，我们研究了针对这种高级应用的高级数据模型。在第一年，我们对数据模型进行了基础研究。讨论了使用面向对象的数据库模型实现安全系统。讨论了如何处理类之间的对象迁移问题，各种数据库约束的表示，以及多媒体数据库的实现；第二年，讨论了如何修改传统的面向对象数据库以适应不同领域的应用。开发了一个从全文论文生成超卡数据的系统。提出了面向对象数据库的设计方法，提出了多项目安全模型，并对面向对象模型进行了推广。讨论了对象迁移和模式评估的交互问题。并结合不同的应用情况，对模型的改进提出了建议。

Due to the increase of database application areas, new database systems for advanced applications are required to handle multi-media data such as pictures, voices, software, knowledge etc. and their relationships. In our research project we have investigated advanced data models for such advanced applications.In the first year, we made basic research on data models. Realization of secure systems using an object oriented database model was discussed. How to handle object migration problems among classes, representation of various database constraints, and realization of multi-media databases are discussed.In the second year, how to modify conventional object-oriented databases in order to apply various areas was discussed. A system which generates hyper-card data from fulltext papers was developed. Design procedures for object oriented databases were also developed.In the last year, multi-project security model is developed and generalization of object-oriented model is proposed. Interaction problems of object migration and schema evaluation is also discussed. Proposal on improvement of the model considering various applications is also given.