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本文讨论了ＭＲＰⅡ中的计划模拟系统的设计和实现。计划模拟系统使用可视仿真工具ＶＡＴ，以资源管理系统ＲＭＳ的生产数据作为输入，模拟生产计划和能力计划，为计划的优化与平衡提供了有效的支持。

RESEARCH OF HIGH AVAILABLE SYSTEM ARCHITECTURE

Traditional Fault tolerant computer system provides very high availability but adopting specific hardware and system software.While the high availability system privides acceptable availability but adopting common hardware and usr space software.This paper describes the High Available System Architecture.On the basis of discuss the failure factor and problems to implement High Available System,present a High Available System architecture with no single point failure and keep away from the whole system failure.