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On fidelity and model selection for discrete event simulation

机译：离散事件仿真的保真度和模型选择

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In simulation, perhaps the most common use of the term 'fidelity' refers to the faithfulness with which model behavior reflects modeled system behavior. While there have been studies of fidelity seeking absolute and quantitative measures, there is not yet a consensus on a workable fidelity metric. We propose a formal modeling framework for comparing discrete event system simulation models in terms of fidelity, using a relative fidelity indicator. Based on the framework, we consider the possibility that the higher fidelity simulation models can also be more productive, even though they are more expensive to develop and use, since they can be used to achieve multiple objectives. First, we propose a formal simulation modeling framework within which the fidelity of simulation models can be discussed. With this framework and a simple example, we then define a relative fidelity indicator that provides a systematic way of comparing the fidelity of two simulation models. The relative fidelity indicator focuses on the most important characteristics in simulation studies: the input and output interfaces and the variables used for specifying a real-world system and simulation models. It does not require any special modeling formalism for model comparison. Based on the relative fidelity indicator and simulation modeling framework, we state the optimum simulation model selection problem to achieve given simulation objectives. Under a practical assumption, we analyze the simulation model selection problem and derive properties related to simulation modeling and the fidelity of simulation models.
机译：在仿真中，术语“保真度”的最常见用法是指模型行为反映建模的系统行为的忠诚度。尽管已经进行了保真度研究，以寻求绝对和定量措施，但对于可行的保真度度量标准尚未达成共识。我们提出了一个正式的建模框架，用于使用相对保真度指标在保真度方面比较离散事件系统仿真模型。基于该框架，我们认为较高保真度的仿真模型也有可能更具生产力，即使它们的开发和使用成本更高，因为它们可用于实现多个目标。首先，我们提出一个正式的仿真建模框架，在其中可以讨论仿真模型的保真度。通过这个框架和一个简单的示例，我们然后定义了一个相对保真度指标，该指标提供了比较两个仿真模型保真度的系统方法。相对保真度指标着重于仿真研究中最重要的特征：输入和输出接口以及用于指定实际系统和仿真模型的变量。它不需要任何特殊的建模形式即可进行模型比较。基于相对逼真度指标和仿真建模框架，我们提出了实现给定仿真目标的最优仿真模型选择问题。在实际假设下，我们分析了仿真模型的选择问题，并得出了与仿真模型和仿真模型的保真度有关的属性。

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