Scalable Enterprise Systems Phase II: Discrete Event System Specification (DEVS) as a Formal Modeling and Simulation Framework for Scaleable Enterprise Design

这个可扩展企业系统第二阶段项目将为可扩展企业设计开发离散事件系统规范（DEVS）正式框架，并扩展早期开发的基于DEVS的建模和仿真环境，以支持几个真实的世界测试案例。 随着互联网向10亿个节点扩展，形成一个高度互联和计算能力强大的媒介，公司增加专业化和水平分层组织，新的复杂性和动态正在出现。 可伸缩性，即随着活动规模的大幅增加而避免性能下降和系统崩溃的能力，是迫切需要解决的全球性问题之一。 这项研究将寻求提高可扩展性的三个相互关联的抽象层次：企业架构水平，信息技术基础设施水平，建模和仿真水平。 早期的研究为构建企业系统的主要职责--确保决策者在正确的时间获得关于企业的正确信息--奠定了理论基础。扩展DEVS形式主义，以表达企业数据管理中的时间关键行为，研究人员建议通过适当扩展NSF赞助的研究中以前开发的分布式实时执行环境来实现扩展的DEVS功能。 该环境将通过两个不同的应用程序进行测试：一个是小规模但完整的真实的工厂自动化测试平台，另一个是用于电子商务的大规模Web托管服务。 由主要政府资助机构（NIST、DOE、NSF和DARPA）发起的集成制造技术倡议（IMTI）指出，建模和仿真正在成为支持21世纪制造业的关键技术。 这项研究将试图填补一些差距之间的当前状态的艺术和IMTI的愿景的未来。在这一愿景中，企业流程、设备和系统通过一个强大的通信基础设施连接起来，在正确的时间提供正确的信息;集成的企业管理系统确保实时做出决定，并在全企业范围的影响的基础上。 实现MS和IT基础设施的可扩展性将使广泛的MS研究和实施，以及支持IMTI所设想的未来基于MS的联网、扩展和分布式企业系统的可扩展性。

This Scalable Enterprise Systems Phase II project will develop the Discrete Event System Specification (DEVS) Formal Framework for Scalable Enterprise Design and extend earlier-developed DEVS-based modeling and simulation environments to support several real world test cases. As the Internet expands toward 1 billion nodes forming a highly interconnected and computationally powerful medium, and companies increase specialization and horizontal layered organization, new complexity and dynamics are emerging. Scalability, the ability to avoid performance degradation and system breakdown as the scale of activity greatly increases, is one of the urgent global problems that needs to be addressed. This research will seek to enhance scalability at three inter-related levels of abstraction: the Enterprise Architecture level, the Information Technology Infrastructure level, and the Modeling and Simulation level. Earlier research developed a theoretical foundation for architecting a major responsibility of enterprise systems -- to ensure that the right information about the enterprise is available to decision makers at the right time. Having extended the DEVS formalism to express time-critical behaviors in enterprise data management, the researcher proposes to implement the extended DEVS functionality by suitably extending the distributed real-time execution environment previously developed in NSF-sponsored research. This environment will be tested by two diverse applications: a small scale but complete and real factory automation test bed and a large-scale web-hosting service for e-business. The Integrated Manufacturing Technology Initiative (IMTI) sponsored by the primary governmental funding agencies (NIST, DOE, NSF, and DARPA) states that modeling and simulation are emerging as key technologies to support manufacturing in the 21st century. This research will attempt to fill in some of the gap between the current state of the art and the IMTI vision of the future. In this vision enterprise processes, equipment and systems are linked via a robust communications infrastructure that delivers the right information at the right time; and integrated enterprise management systems that ensure that decisions to be made in real-time and on the basis of enterprise-wide impact. Achieving scalability in M&S and IT infrastructure will enable a wide array of M&S studies and implementations, as well as supporting the scalability of the future M&S-based networked, extended and distributed enterprise systems envisioned by IMTI.