We identify three goals for the graphical user interface (GUI) of a network simulation environment: user friendliness, model re‐usability, and application extensibility. We address the user‐friendliness issue by proposing a simple yet efficient approach to setup parameters for the simulation models. We address the application extensibility issue with a two‐layer GUI architecture. The two layers are loosely coupled, and the first layer can be easily replaced without affecting the other components of the simulation environment. The concept of subnetwork is used to address the model reusability issue. Unlike most existing simulation packages, where a subnetwork is simply a method to group the nodes, the subnetwork construct in our approach is a first‐class citizen in the simulation environment (i.e., all operations for a basic node also apply to a subnetwork). The port concept is used to define the I/O relationship between a subnetwork and the outside world. Parameter dialog boxes are used to set up the parameters for a subnetwork conveniently. Finally, a simple stack mechanism is used to measure subnetwork‐wide output statistics.
Performance analysis of Computer Operations Systems in the integrated System-of-Systems environment is a dijjicult but essential task to assure their successful deployment. This paper describes a prototyping effort, entitled COPS (Computer Operations P e r f o m m e Simulation System), initiated to provide a mechanism for the eflcient modeling and simulation of integrated operations Systems performance by system designers, planners and performance analysts. We deJine the objectives of the COPS work, the requirements and scope of the study, the modeling concept on which COPS is based, the COPS system design, a description of each of the major COPS building blocks and an example application of COPS to an integrated Operations Systems modeling problem.
We identify three goals for the graphical user interface (GUI) of a network simulation environment: user friendliness, model reusability, and application extensibility. We address the user friendliness issue by proposing a simple yet efficient approach to setup parameters for the simulation models. We address the application extensibility issue by a two-layer GUI architecture. The two layers are loosely-coupled, and the first layer can be easily replaced (without affecting the other components of the simulation environment). We address the model reusability issue by subnetworks. Unlike most existing simulation packages where subnetwork is simply a method to group the nodes, the subnetwork construct in our approach is an integral part of the simulation environment (i.e., all operations for a basic node also apply to a subnetwork). The port concept is used to explicitly define the 1/0 relationship between a subnetwork and the outside world. Parameter dialog boxes are used to set up the parameters for a subnetwork conveniently. Finally, a simple stack mechanism is proposed to measure subnetwork-wide output statistics.
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