共查询到20条相似文献，搜索用时 390 毫秒
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ＮＴＲＯＤＵＣＴＩＯＮＡｆｔｅｒｍｕｃｈｒｅｓｅａｒｃｈａｎｄｓｏｍｅｓｕｃｃｅｓｓｆｕｌａｐ ｐｌｉｃａｔｉｏｎｓｏｆＡｒｔｉｆｉｃｉａｌＮｅｕｒａｌＮｅｔｗｏｒｋ (ＡＮＮ)ｔｏｃｏｎｔｒｏｌｓｙｓｔｅｍｓ,ＡＮＮｈａｓｂｅｃｏｍｅｏｎｅｏｆｔｈｅｉｍ ｐｏｒｔａｎｔｔｏｏｌｓｔｏｓｈｏｗｔｈｅｉｎｔｅｌｌｉｇｅｎｃｅｏｆｔｈｅｈｕ ｍａｎｂｒａｉｎ .ＳｉｎｃｅＡＮＮｃａｎｂｅｕｓｅｄｔｏｄｅｓｃｒｉｂｅａｎｙｎｏｎｌｉｎｅａｒｃｏｎｔｉｎｕｏｕｓｆｕｎｃｔｉｏｎ ,ｉｔｈａｓｄｒａｗｎｍｕｃｈａｔ… 相似文献
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基于扩展Petri网的混合系统建模方法 总被引：1，自引：0，他引：1
为了对混合系统进行有效地建模,提出了一种扩展的面向对象混合Petri网(EOHPN)建模方法.针对混合系统的复杂性,在EOHPN模型中融入了面向对象的抽象机制,例如封装和类定义.为了结合混合系统的连续部分和离散部分,减少混合系统的复杂性,引入混合Petri网并用面向对象建模技术作了扩展.在定义EOHPN模型的基础上,拓展了对象模型.最后,用实例描述了基于EOHPN的混合系统建模过程,同时验证了EOHPN模型在处理复杂混合系统建模时是有效的. 相似文献
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In this paper, a model based colored Petri net (CPN) to provide semantic support for web service composition is proposed, and the reliability and maintainability of composite services are improved. The composite constructs in the model are sequence, concurrent, choice, loop and replace. The web service is formally defined by a CPN. A closed composing algebra is defined to obtain a framework which enables declarative composition of web services. Availability, confidentiality, and integrity of composite service are analyzed within the framework of the model based CPN. 相似文献
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CHANG Hong RU Feng XUE Jun-yi 《重庆大学学报(英文版)》2006,5(4):205-211
1 Introduction a After many years’ research and developments, communication networks have demonstrated more and more important functions in a substation automation system (SAS). In our experience in developing and applying such systems, we have witnessed… 相似文献
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通过研究概率事件结构图的事件路径,提出了集成系统的关键事件路径分析方法．根据集成系统体系结构描述提取的规则,构造着色Petri网模型对应的概率事件结构图,并给出其循环事件路径、顺序事件路径和关键事件路径的定义．然后利用着色Petri网模型的仿真统计结果,采用灵敏度分析方法找出其关键事件路径．该方法强化了逻辑结构特性,可靠实用,是离散事件系统结构化分析的基础．最后以一个建模实例详细阐述了该方法的应用,结果适用可信． 相似文献
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Stochastic individual predicate/transition nets 总被引：1，自引：0，他引：1
We analyze the drawbacks of generally distributed time transition stochastic Petri nets （GDTT_SPN） in evaluating the performance of parallel systems, and propose a more general model, stochastic individual predicate/transition nets （SIPTN）. SIPTN has higher modeling power and could provide more realistic models compared to GDTT_SPN, because in SIPTN the sojourn time distribution is determined not only by the transition, but also by the individuals. It is further proved that GDTT_SPN is a subset of SIPTN. As SIPTN introduces folding techniques from predicate/transition nets, SIPTN models have simpler and more intuitive graphic notations and accordingly higher usability, and thus are suitable for constructing simulation models for parallel systems. 相似文献
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INTRODUCTIONAt present, plastic as a substitute for metals in products is the most important mainstay in industrial raw materials. Furthermore, plastic injection molding is one of the most common and versatile methods for mass production of complex plastic parts with excel-lent dimensional tolerance. Since the technology of injection molding has been widely applied in manu-facturing, training on injection molding is of great importance. The traditional approach is to consult some technica… 相似文献
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秦奋涛 《河北北方学院学报(社会科学版)》2000,16(2):78-80
死锁是操作系统的一个重要概念,本文提出用库所/变迁网直观、动态地描述并发进程的死锁,本人将这一方法用于操作系统有关死锁内容的教学取得了非常好的效果. 相似文献
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在给出用例及其相关概念的形式化定义的基础上,构建了从用例到具有优先级策略的时间Petri网模型映射的实施方法;提出了一种基于用例和Petri网的建模方法.它先以用例来捕获需求,再用具有优先级策略的时间Petri网来图形化用例,以此来实现它们各自优势的互补。 相似文献
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生产者与消费者问题是研究进程同步的典范 .抛开了《操作系统》等书籍中的类PASCAL语句描述 ,引入FSM与PETRI网 ,给出各自的图示 ,并对FSM与PETRI网进行了比较 . 相似文献
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ＡＦｏｒｍａｌＡｐｐｒｏａｃｈｔｏｔｈｅＤｅｓｉｇｎｏｆＮｅｔｗｏｒｋＰｒｏｔｏｃｏｌＬｕｏＪｕｎｚｈｏｕ（罗军舟）ＧｕＧｕａｎｑｕｎ（顾冠群）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，Ｓｏｕｔｈｅａｓｔ... 相似文献
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This paper proposes an adaptive algorithm of neural nets with a special perturbation for a real time velocity control system
of a VVVF (Variable Voltage Variable Frequency) hydraulic elevator. The weight vector of the neural network is adaptively
adjusted by the LMS (Least Mean Square) with perturbation, so it is not necessary to know the nonlinear continuous function
of the control system. The nonlinear velocity control system is considered as the controller output function in an adaptive
controller model. The experimental results obtained from the VVVF hydraulic elevator showed that the neural nets controller
using the perturbation algorithm proposed are much stabler and faster in dynamic response compared with the conventional PID
(Proportion-Integration-Derivation) controller.
Project (69775013) Supported by NSFC 相似文献
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随着现代化教学活动的开展和与国内外教学机构交往的增多．对通过Internet／Interanet网络进行信息交流的需求越来越迫切。为促进教学、方便管理和进一步发挥学生的创造力，校园网建设成为学校发展的重要基础设施．本文着重探讨校园网建设中应该考虑的问题及解决发方案。 相似文献
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本文以某供电局为例,介绍了光缆及光纤网络在电力通信中的应用,光纤骨干传输网络结合其供电局电网发展要求,在已建成的光纤主干电路的基础上,按照两个独立的传输网络A网和B网分别进行设计和建设,提高电力通信网络的服务能力。 相似文献
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针对车辆变速器故障诊断复杂且不准确的问题,提出利用贝叶斯网络(Bayes nets)诊断车辆变速器故障的方法。选取一汽大众迈腾自动变速器1.4T为例,建立该车型自动变速器故障信息的贝叶斯诊断网络,并探讨当该系统某一部件出现故障时,利用Hugin Expert软件计算不同故障现象出现的概率。应用表明,贝叶斯诊断网络能够有效诊断车辆变速器故障,节省诊断时间。 相似文献
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WWW下基于Petri Net的协同编辑模型 总被引：2，自引：0，他引：2
袁红照 《安阳师范学院学报》2002,(2):16-19
工作流管理是一个以业务处理自动化为目标的新兴研究领域。近几年来Internet的发展深刻地影响着工作流管理系统。本文旨在用PetriNet这种非常适合描述离散动态系统的工具建立一个基于WWW环境的期刊协同编辑系统模型 ,使编辑流程规范化 ,也为后期开发提供可靠的理论基础 相似文献
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Y. Narahari 《Resonance》1999,4(9):44-52
Petri nets offer a versatile modeling framework for complex, distributed, concurrent systems and have been used in a wide
range of modeling applications. In Part 1 of this two-part article, we have seen important features and representational power
of the Petri net model. We have also seen how the application of firing rules enables Petri nets to capture the dynamics or
behavior of the modeled system. In this part, we will first understand how important system properties are modeled by Petri
nets and then look into the applications of Petri net models. 相似文献