共查询到18条相似文献,搜索用时 140 毫秒
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基于TCPN的产品协同设计过程时序逻辑推理研究 总被引:1,自引:0,他引:1
针对具有动态、并发、不确定性特点的协同设计过程的设计活动模糊时间推理问题,基于时间约束Petri网理论,建立一种产品协同设计过程模型及其时间约束关系模型.通过分析协同设计过程的时间约束类型,提出了协同设计活动间的时间约束触发规则与推理机制,以及不同触发规则下的时间运算关系;最后通过一个链式输送机协同设计过程实例,验证了文中模型的相关结果,并开发了一个基于时间约束Petri网的协同设计过程时序推理仿真系统. 相似文献
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网上证券交易系统的时序Petri网描述及验证 总被引:9,自引:0,他引:9
基于时序Petri网对我国现行网上静态和动态证券交易系统进行了模拟、形式描述及功能正确性验证.应用时序逻辑推理规则,从形式上严格证明了证券交易系统需求规范及其时序Petri网模型动态行为的一致性.结果表明,时序Petri网能够清楚而简单地描述事件间的因果关系和时序关系以及并发系统中某些与时间有关的重要性质,如最终性和公平性.因此,时序Petri网可作为并发系统形式化描述和分析的有力工具. 相似文献
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综合航电系统是一种对可靠性、实时性要求非常高的嵌入式应用系统。为了解决针对复杂应用场景下综合航电系统的处理时间和工作时序预估较困难、且计算自动化程度不高等测试验证问题,提出了一种基于时间约束Petri网的综合航电系统时序验证和分析方法。给出了时间约束Petri网的形式化定义,分析了综合航电系统工作流程中各节点的时间属性,通过引入时序约束路径的概念,并提出了时序推理算法。通过在仿真算例中进行计算并对比实际运行数据,结果表明该方法在针对综合航电系统运行时序的验证分析方面具有有效性。 相似文献
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在扩展Petri网基础上提出了一种新的文本分类模型。基本思想是利用定性映射方法扩展Petri网系统,利用状态方程进行推理,使文本分类更接近于人类思维判断过程,并给出了分类算法。 相似文献
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《IEEE transactions on systems, man, and cybernetics. Part A, Systems and humans : a publication of the IEEE Systems, Man, and Cybernetics Society》2005,35(5):682-696
Extended interval temporal logic (EITL), an extension of the traditional point-interval temporal logic (PITL), is proposed. In contrast to PITL that represents the dynamic aspects of deterministic intervals, EITL can model and reason about the temporal relations among nondeterministic intervals in discrete-event systems, in which the duration of an event is indeterminate and only the lower bound and upper bound of the ending time can be predicted in advance. Time Petri nets (TPNs) are used for modeling EITL, for they give a straightforward view of temporal relations between the extended intervals and also provide a number of theoretical and practical analysis methods. An inference engine based on the TPN modeling complemented with algebraic inequalities is proposed to construct an analytical representation of the EITL relations and solve qualitative temporal reasoning problems. Linear inference mechanism based on TPN reduction rules is used to infer new temporal relations and handle quantitative temporal reasoning problems with linear time complexity, as our example shows. 相似文献
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本文提出了一种基于可信度逻辑的主体信念程度描述方法,这种方法通过定义信念的可信度描述主体信念的不确定性,允许相互矛盾的主体信念同时存在,并给出了可信度的计算方法与推理规则。信念修正和更新时,根据主体不同的性格采取不同的选择倾向,本文提出的“必要时修正”方法具有很高的效率和实用性。本文选择基于区间的时间逻逻辑描述主体信念中的时间概念,为涉及到大量时间段行为与操作的应用提供了一个新的信念逻辑描述方法。 相似文献
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This article introduces a temporal deductive database system featuring a logic programming language and an algebraic front-end. The language, called Temporal DATALOG, is an extension of DATALOG based on a linear-time temporal logic in which the flow of time is modeled by the set of natural numbers. Programs of Temporal DATALOG are considered as temporal deductive databases, specifying temporal relationships among data and providing base relations to the algebraic front-end. The minimum model of a given Temporal DATALOG program is regarded as the temporal database the program models intensionally. The algebraic front-end, called TRA, is a point-wise extension of the relational algebra upon the set of natural numbers. When needed during the evaluation of TRA expressions, slices of temporal relations over intervals can be retrieved from a given temporal deductive database by bottom-up evaluation strategies.
A modular extension of Temporal DATALOG is also proposed, through which temporal relations created during the evaluation of TRA expressions may be fed back to the deductive part for further manipulation. Modules therefore enable the algebra to have full access to the deductive capabilities of Temporal DATALOG and to extend it with nonstandard algebraic operators. This article also shows that the temporal operators of TRA can be simulated in Temporal DATALOG by program clauses. 相似文献
A modular extension of Temporal DATALOG is also proposed, through which temporal relations created during the evaluation of TRA expressions may be fed back to the deductive part for further manipulation. Modules therefore enable the algebra to have full access to the deductive capabilities of Temporal DATALOG and to extend it with nonstandard algebraic operators. This article also shows that the temporal operators of TRA can be simulated in Temporal DATALOG by program clauses. 相似文献
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SPIN模型检测器主要用来检测线性时序逻辑描述的规范,而多智体系统的规范采用时序认知逻辑描述比较方便。本文着重讨论了如何利用SPIN模型检测线性时序认知逻辑的方法,根据局部命题的理论,将模型检测知识算子和公共算子表述的规范规约为模型检测线性时序逻辑的问题,从而使SPIN的检测功能由线性时序逻辑扩充到线性时序认知逻辑。本文通过一个RPC协议分析实例来说明模型检测线性时序认知逻辑的方法。 相似文献
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A general system is presented in this paper which supports the expression of relative temporal knowledge in process control and management. This system allows knowledge of Allen's temporal relations over time elements, which may be both intervals and points. The objectives and characteristics of two major temporal attributes, i.e. ‘transaction time’ and ‘valid time’, are described. A graphical representation for the temporal network is presented, and inference over the network may be made by means of a consistency checker in terms of the graphical representation. An illustrative example of the system as applied to process control and management is provided. 相似文献