The saturated state of midtown traffic due to a rapid increase of the number of cars made it impossible for road systems to function properly. With regard to this situation, it is considered to be necessary to build an entirely new traffic management system which will have various functions in order to ease the congestion of traffic by means of efficient road administration.
Data used in traffic management systems are composed of unformatted multimedia ones such as text, image, graphic, voice and video signal as well as existing formatted data. Accordingly, a new model that can express the complex relationships among different media's data and their characteristics is in need. The relationships are composed of a temporal relationship and a spatial relationship. The former means the precedence, parallel relationship and synchronization and the latter means an absolute or relative local relationship between data. Especially, a new modeling method to express and treat the temporal relationships is essential when expressing relationships of various media data. Therefore this study proposes a mechanism to represent the temporal relationships among multimedia data and to utilize the represented information dynamically using an object-oriented paradigm. The main idea of this approach is that UserObject class has an instance that is an object produced in traffic management systems. Each instance shares the class schema structure and 'Temporal' class is created independently to represent the temporal relationship in UserObject class's instance. As explained above, this temporal object is selected dynamically to represent the relationships among instance of UserObject class. In addition to seven temporal relationships defined by J. Allen, the concept of a group of temporal relationships among multimedia data is proposed to edit dynamic data. The definition of a class structure represents temporal relationships. This definition satisfies not only the requirements of users' various representations but also a dynamic data representation for multimedia database systems.
