Development of a network-based plant growth simulation execution system

我们开发了一个基于WWW(World Wide Web)的植物生长模型模拟执行系统，并使用多种植物生长模型对其进行了测试。大多数传统的增长模拟模型都是用高级计算机语言和/或模拟语言描述的。由于每个模型都有自己的计算算法和复杂的子程序，因此很难将模型源程序翻译成另一种语言。在我们的系统中，一个模拟程序是用它的原始语言编译和执行的。在WWW服务器上用C语言编写的CGI(公共网关接口)程序提供客户端与仿真模型程序之间的用户接口，并创建中间输入/输出文本文件。模拟程序从输入文件中读取输入数据，并将计算结果写入输出文件。此过程工作简单，修改输入/输出例程不需要完全理解源程序。利用该系统实现了用C语言编写的大田生菜生长模型、用Pascal语言编写的水培生菜生长模型以及用Fortran和CSMP编写的6种作物的通用生长模型。源程序的输入/输出例程由20到30行组成，很容易修改。该系统是在Microsoft Windows WWW服务器上实现的。仿真程序可以在系统中不需要任何程序的情况下执行。我们还开发了一个基于Java Servlet的植物生长模拟执行系统。

We have developed a plant growth model simulation execution system based on the WWW (World Wide Web) and tested it using several plant growth models. Most legacy growth simulation models were described in high-level computer languages and/or in simulation languages. Since each model has its own calculation algorithm and complicated subroutines, it is difficult to translate a model source program into another language. In our system, a simulation program is compiled and executed using its original language. CGI (Common Gateway Interface) programs written in C language on a WWW server provide user interface between the client and a simulation model program, and create intermediate input/output text files. The simulation program reads input data from the input file and writes calculation results into an output file. This procedure works simply, and a modification of input/output routines does not require a complete understanding of the source program. A field lettuce growth model written in C, a hydroponic lettuce growth model in Pascal, and a general-purpose growth model for six crops in Fortran and CSMP were implemented using the system. The input/output routines of the source programs were comprised of 20 to 30 lines and were easily modified. This system was implemented on a Microsoft Windows WWW server. The simulation programs could be executed without any programs in the system. We also developed a JavaServlet based plant growth simulation execution system.