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Petri网的分层递归模型 总被引:9,自引:1,他引:8
Petri网的分层模型是应用Petri网对复杂系统建模时的一种常用手段.在传统的Petri网分层模型中,是不考虑递归的.这样的分层模型虽然为系统的建模和分析带来方便,但并增强模拟能力.在分层模型中引入递归的概念,可以使系统的模拟能力增强.可以证明,任意一个上下文无关语言都可以被一个分层递归Petri网识别. 相似文献
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介绍了双变迁Petri网的基本理论,探讨了Petri网模型的逻辑电路描述方法;针对逻辑电路模拟双变迁Petri网所遇到的问题,提出了采用硬件描述语言模拟双变迁Petri网的方法,详细讨论了用Verilog语言实现双变迁Petri网的技术;通过一个双变迁Petri网模型实例,在模拟软件中进行了模拟分析,验证了方法的可行性。研究表明,使用硬件描述语言描述Petri网模型,利用现有的设计模拟工具,可以模拟模型运行,分析模型的特性,方法简便,适用范围广,为双变迁Petri网模拟分析提供了一种新途径。 相似文献
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首先给出判定a是奇素数模p的平方剩余的增广Petri网模型,然后给出求解二次同余式x2≡a(modp,p≥3,素数,(a,p)=1)的增广Petri网模型.同时给出这种类型增广Petri网的矩阵分析和状态方程,从而导出由EXN网的输入求其输出的算法. 相似文献
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首先给出判定a是奇素数模p的平方剩余的增广Petri网模型,然后给出求解二次同余式x2≡a(modp,p≥3,素数,(a,p)=1)的增广Petri网模型.同时给出这种类型增广Petri网的矩阵分析和状态方程,从而导出由EXN网的输入求其输出的算法. 相似文献
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《系统工程》2010,(11)
Petri网理论已成为柔性制造系统中建模与分析的主流技术之一,基于Petri网的调度优化问题已被广泛研究。本文为解决柔性制造系统的调度问题,提出了一种基于Petri网和遗传算法相结合的调度方法。首先用赋时Petri网对柔性制造系统进行建模,然后应用遗传算法对该模型进行调度并获取近似最优解。在该算法中,采用新的编码/解码机制,用Petri网模型的变迁激发序列作为染色体编码,且对群体中每个染色体对应的变迁序列不再要求其满足Petri网的可达性条件,而是通过解码部分将其转换为一个满足可达性条件的序列,从而大大简化初始化种群,以及交叉和变异操作。该方法融合了Petri网和遗传算法各自的优点,既可以处理典型的Job-Shop问题,也可以较好地解决柔性制造系统的调度问题。文中通过仿真实验证明了该方法的有效性。 相似文献
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基于分解的结构复杂Petri网的语言行为描述 总被引:8,自引:1,他引:7
Petri网语言是用于系统行为分析的强有力手段,然而给定一个Petri网尤其是结构复杂的网系统。很难直接求解其语言表达式.针对这个问题,通过定义Petri网的库所指标函数,把一个结构复杂的网系统分解成结构简单的子网,即子网中每个变迁的输入库所和输出库所的数目均小于等于1,并分析了这些子网系统的语言特性.利用Petri网语言同步交运算,给出了一种求取结构复杂Petri网的语言表达式的方法,从而为利用网语言分析系统的行为提供了理论依据和方法。 相似文献
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《系统工程理论与实践》2014,(5)
正August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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《系统科学与系统工程学报(英文版)》2014,(2)
正AF:Any Field The School of Economics and Management at Tsinghua University(Tsinghua SEM)invites applications for faculty positions at all levels(Assistant Professor,Associate Professor and Full Professor)in any fields of business administration and management.Tsinghua SEM is the only school 相似文献
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《系统科学与系统工程学报(英文版)》2014,(4)
正June 22-24,2015Guangzhou,China http://iec.cnsba.com/index.htmlCo-Sponsored by:ffiEE SMC(pending)South China University of Technology The Chinese University of Hong Kong Tsinghua UniversityHosted bv:School of Business Administration,South China University of Technology,China Conference Co-Chairs: 相似文献
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The paper is about negotiating with issues that discourage innovation. The subject is environmental deterioration, with concern directed at the impediments that keep it from being innovatively resolved. The paper is organized around three issues. (1) The dominant model of environmental concern, called environmental protection, is managed predominantly via command and control approaches. (2) Command and control, by relying on analytical segmentation to subdivide the problem into digestible bits and using formal legislation to direct it, are not up to emerging challenges in the area. (3) More robust models are available but difficult to experiment with due to impediments that discourage change. These impediments are seen in ideals associated with protection, prevention, recycling, and sustainability that tend to do more to sustain harmful practices than to seek beneficial alternatives. Being able to appreciate the underlying restrictions of entropy could help stimulate a more innovative agenda. These issues are tested via a project funded by the EPA entitled ENERGY STAR Homes. 相似文献