Abstract
Elevator owners increasingly prefer elevators having improved performance and safe operation. This has stimulated the development of elevator monitoring systems. The elevator monitoring systems need various application programs and a lot of information necessarily. The elevator monitoring systems need the database to monitor numerous elevators simultaneously. Since the object-oriented database system has many advantages on managing and maintaining the data structure, we have adopted the object-oriented database for elevator monitoring system. The objectives of this paper are to show the restrictions and the possible problems when using a model of the relational database system for the elevator monitoring system, to show how a model of the relational database system can be extended to a model of the object-oriented database system in order to overcome the restrictions, and to show advantages and future plans when applying the object-oriented database technology to the elevator monitoring system.