An Interactive Simulation System consists chiefly of Graphics

本研究的目的是设计并实现一个以图形为主的离散事件仿真交互系统。该系统称为图形仿真系统（GraphicSimulationSystem，GSS），它高度利用图形显示，提供了一个用户友好的仿真支持环境，不仅支持建模，而且支持仿真实验和结果分析。从这个意义上说，GSS是一个集成的仿真支撑系统。GSS是一个易于使用的系统，即使是未经培训的用户，因为它的交互能力的基础上的图形界面。本研究的第一个目标是设计和实现一个系统，用于建立一个仿真模型，由简单的图形图元组成的组件网络，并指定每个组件的逻辑行为。GSS的第一个版本在DEC-2020上由Simula作为系统实现语言实现，并通过Smalltalk-80移植到SIP 1100上以改善人机界面。系统描述能力是离散事件仿真系统和/或语言可用性的关键因素。作者对GSS的逻辑规范部分进行了通用化处理，以达到通用仿真系统的目的。因此，GSS有足够的能力来描述通用的离散事件仿真模型。DEC版的GSS采用传统的人机交互方式，人机界面较差。Smalltalk版本通过使用面向对象的编程范式来扩展逻辑行为规范。由于缺乏处理能力，特别是在多窗口处理方面，传输过程无法成功传输到个人计算机。多窗口处理能力在结构模型构建阶段至关重要。然而，我们计划至少在GSS的模型构建部分继续努力，因为我们可以在个人计算机上使用颜色。

The purpose of the research was to design and implement an interactive system which consisted chiefly of graphics for discrete event simulation. The resulting system which is called GSS(Graphic Simulation System) highly utilizes a graphic display and supplies a user friendly simulation support environment.The GSS supports not only modelling but also simulation experiments and analysis of results. In this sense, the GSS is an integrated simulation support system. The GSS is an easy to use system even for untrained users because of its interactive capabilities based on graphic interface.The first object of this research was to design and implement a system for building a simulation model by making a component network which consisted of simple graphic primitives and specifying logical behavior of each component. The first version of the GSS was implemented on DEC-2020 by Simula as a system implementation language and transported to SIP1100 for improveng man-machine interface by Smalltalk-80.The capability of describing systems is a key factor of usability of discrete event simulation systems and/or languages. The author put generality on the logical specification part of the GSS to attain a general purpose simulation system. Thus the GSS has enough power to describe general purpose discrete event simulation models. The DEC version of the GSS was poor in man-machine interface for it used traditional interactive mode. The Smalltalk version improves this aspect to extend logical behavior specification by using object oriented programming paradigm.A transportation process to personal computers is not successful because of lack of processing power especially on multi-window handling. The capability for multi-window handling is essential in the structural model building phase. However, we plan to continue the effort at least on the model building part of the GSS for we can use colors on personal computers.