An Interactive Simulation System consists chiefly of Graphics

研究的目的是设计和实现一个以图形为主的离散事件仿真交互系统。由此产生的系统被称为GSS（图形仿真系统），它高度利用了图形显示并提供了一个用户友好的仿真支持环境。GSS不仅支持建模，还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持系统。由于其基于图形界面的交互能力，即使对于未经训练的用户，GSS也是一个易于使用的系统。本研究的第一个目标是通过制作由简单图形原语组成的组件网络，并指定每个组件的逻辑行为，设计并实现一个用于构建仿真模型的系统。第一版GSS由Simula作为系统实现语言在DEC-2020上实现，并通过Smalltalk-80传输到SIP1100以改进人机界面。描述系统的能力是离散事件仿真系统和/或语言可用性的关键因素。作者将GSS的逻辑规范部分通用性化，以实现通用仿真系统。因此，GSS有足够的能力来描述通用的离散事件仿真模型。DEC版本的GSS采用传统的交互方式，人机界面较差。Smalltalk版本通过使用面向对象的编程范例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，向个人计算机传输过程并不成功。在结构模型构建阶段，多窗口处理能力是必不可少的。但是，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.