| Different simulation applications require different levels of model detail. As the complexities and flexibilities of manufacturing systems are ever increasing, the flexibility of simulation system to model real world systems with arbitrary levels of detail becomes important. Existing simulation systems provide predefined models that limit their flexibility.; In this thesis, the author develops a conceptual modeling strategy that combines the Event-Scheduling strategy and the Object-Oriented paradigm. A basic element is developed to model any resource and is mapped to an extended Parallel DEVS formalism. This strategy provides general framework and system requirements for further computerized development. Such a system is able to implement recursive hierarchical modeling, which provides the environment to model real world systems at any level of detail. The basic element also provides simplified functions and syntaxes that make the system easy to learn and maintain. A two-layer object construction framework is also discussed to pushing down "low-level" aspects of simulation to the systems level, and away from the user. Several examples are developed in this thesis, which illustrate DOBIS has the potential to outperform existing systems in several aspects. |
