When working interactively on the computer, it is valuable to be able to undo a series of commands in order to return to a previous state. We identify contradictions and limitations in the basic concepts of undo. We examine the characteristics of undo, explain these limitations, and explore the requirements for more general recovery facilities.
The development of models for evaluating the performance of resource contention systems, such as manufacturing systems, computer systems, and communication networks, is often a difficult and complex task. This modeling effort can be dramatically reduced by the use of appropriate software tools. The Research Queueing Package Modeling Environment (RESQME) provides a graphical environment for constructing, solving, and analyzing the results of extended queueing network models of resource contention systems. It supports a rich underlying modeling paradigm previously developed in the Research Queueing Package (RESQ) and provides a single integrated graphical interface throughout all tasks of the modeling lifecycle. In this paper we present a brief overview of RESQME and then focus on two of its most important features: the construction and analysis of hierarchically-structured models and the ability to extend and customize the RESQME environment for domain-specific modeling via the use of user-defined modeling elements. A manufacturing model is developed in order to illustrate these capabilities.simulation-programming languages, simulation-software, performance modeling tools, performance modeling methodology, visual programming
The Research Queueing Package Modeling Environment (RESQME) provides a graphical environment for constructing, solving, and analyzing the results of extended queueing network models of resource contention systems. It has been used to improve the performance of existing and planned systems in such application areas as computer systems, communications networks, manufacturing processes, transportation systems, customer service facilities. RESQME provides the capability to specify a queueing model by drawing a network diagram and attaching attribute information to each object in the diagram.It then evaluates the model using its general-purpose, discrete event simulation software and produces graphical and tabular performance results, along with animation on the original model diagram.Cofildence interval methods are incorporated to insure that the results of a simulation meet the desired level of accuracy.
The RESearch Queueing Package Modeling Environment (RESQME)is a system which provides an integrated, graphics-oriented, performance evaluation workstation environment for constructing, maintaining, revising and evaluating performance models of resource contention systems. In this paper we discuss examples illustrating its use and emphasize the iterative nature of the modeling process. Scenarios of model specification, selection and use of confidence interval methods, and model output analysis are introduced.
The RESearch Queueing Package Modeling Environment, RESQME, is a graphical environment for creating and modifying queueing models and for evaluating and analyzing the results. An animation facility is a natural adjunct to the graphics-oriented capabilities of this system. In such an environment, animation provides a powerful tool for effectively visualizing massive amounts of information. This makes it easier for the modeler to relate events in the model with processing in the real-world system.Animation enhances the modeler's ability to debug the model, to understand the model interactions and the impact of model changes, and to communicate the results to others. In this paper, we describe the animation facility in RESQME.
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