VLSI功能测试的最佳测试序列的选取

介绍了ＶＬＳＩ功能测试向量生成的Ｐｅｔｒｉ网模型和Ｐｅｔｒｉ网模拟测试序列中指令的关系,构造了压缩存储网络的拓扑信息的Ｐｅｔｒｉ网简约矩阵。用Ｐｅｔｒｉ网简约矩阵检查测试序列的不确定度,使测试序列不确定度最小,从而优化了测试序列,即从给定的指令中选出了最佳测试序列。     

基于模糊集理论的知识融合方法研究

在知识管理领域中, 根据知识源的特点, 通过融合处理多源知识, 形成新的知识层, 提高知识的内涵、层次和置信度, 并提升实现系统任务目标的能力。在基本知识层、方法层和思想层三级融合层次的基础上, 研究多源知识融合处理, 得出融合结构与框架。将信息融合处理技术移植到知识融合处理中, 形成基于模糊集理论的知识融合算法, 得出处理流程和基于Petri网的融合模型。利用基于模糊集理论的知识融合算法, 综合各预警模型的观察结果, 讨论企业失败预警问题。实例和仿真结果表明:知识融合判别方法降低了企业失败预警判别的不确定性, 知识融合在知识管理领域应用是有效和可行的。     

基于面向对象时间约束Petri网的加工-装配车间资源可调度性研究

为了解决加工装配车间的资源冲突问题,提出了基于面向对象时间约束Petri网的加工装配车间资源可调度性 判定方法。该方法给出了面向对象时间约束Petri网的语义描述和可调度性定义,建立了基于面向对象时间约束Petri网 的加工装配车间的建模方法,提出了基于加工装配车间各资源生产的最早触发开始时间和最晚触发结束时间的车间可 调度性判定依据与判定步骤,并给出了资源不可调度时的改进方法。给出了应用实例,验证了所提出的判定方法的有 效性。     

基于NGN的新兴电信运营商的创新发展研究

在阐述NGN内涵和特征的基础上,探讨了NGN对电信运营商,特别是新进入者的业务流程和商业模式的变革形态,分析了湖南网通公司引入NGN实现固网差异化竞争的案例,提出了新兴基础电信运营商要充分发挥体制新颖灵活的优势,以创新业务发展为平台,积极探索转型之路,以用户需求为导向推进终端智能化,进行网络、业务融合,实现电信网、广电网和互联网的“三网融合”。     

浅谈广电网络在“三网融合”背景下的机遇与挑战

＂三网融合＂是指电信网、计算机网和有线电视网三大网络通过技术改造,能够提供包括语音、数据、图像等综合多媒体的通信业务。从长远角度看,＂三网融合＂更有利于广电网络运营商的发展,主要是由于广电网络运营商在内容资源、政策支持与意识形态属性等方面具有一定的优势,但其起步较晚,市场化程度较电信行业低,又受到体制、资金等方面的约束,其前景依然任重而道远。     

MORM—A Petri Net Based Model for Assessing OH&S Risks in Industrial Processes: Modeling Qualitative Aspects

Because of the increase in workplace automation and the diversification of industrial processes, workplaces have become more and more complex. The classical approaches used to address workplace hazard concerns, such as checklists or sequence models, are, therefore, of limited use in such complex systems. Moreover, because of the multifaceted nature of workplaces, the use of single-oriented methods, such as AEA (man oriented), FMEA (system oriented), or HAZOP (process oriented), is not satisfactory. The use of a dynamic modeling approach in order to allow multiple-oriented analyses may constitute an alternative to overcome this limitation. The qualitative modeling aspects of the MORM (man-machine occupational risk modeling) model are discussed in this article. The model, realized on an object-oriented Petri net tool (CO-OPN), has been developed to simulate and analyze industrial processes in an OH&S perspective. The industrial process is modeled as a set of interconnected subnets (state spaces), which describe its constitutive machines. Process-related factors are introduced, in an explicit way, through machine interconnections and flow properties. While man-machine interactions are modeled as triggering events for the state spaces of the machines, the CREAM cognitive behavior model is used in order to establish the relevant triggering events. In the CO-OPN formalism, the model is expressed as a set of interconnected CO-OPN objects defined over data types expressing the measure attached to the flow of entities transiting through the machines. Constraints on the measures assigned to these entities are used to determine the state changes in each machine. Interconnecting machines implies the composition of such flow and consequently the interconnection of the measure constraints. This is reflected by the construction of constraint enrichment hierarchies, which can be used for simulation and analysis optimization in a clear mathematical framework. The use of Petri nets to perform multiple-oriented analysis opens perspectives in the field of industrial risk management. It may significantly reduce the duration of the assessment process. But, most of all, it opens perspectives in the field of risk comparisons and integrated risk management. Moreover, because of the generic nature of the model and tool used, the same concepts and patterns may be used to model a wide range of systems and application fields.     

PETRI网及其在建设系统中的应用探讨

针对Petri网对离散性事件系统和同步系统模拟的优势，构造几种适用于工程作业过程的Petri网基本结构，对建设系统进行模拟，并举例予以说明。     

基于NGN的新兴电信运营商的创新发展研究

在阐述NGN内涵和特征的基础上，探讨了NGN对电信运营商，特别是新进入者的业务流程和商业模式的变革形态，分析了湖南网通公司引入NGN实现固网差异化竞争的案例，提出了新兴基础电信运营商要充分发挥体制新颖灵活的优势，以创新业务发展为平台，积极探索转型之路，以用户需求为导向推进终端智能化，进行网络、业务融合，实现电信网、广电网和互联网的“三网融合”。     

一种分布式实时嵌入式系统的调度分析算法

针对现有的基于Petri网的调度分析算法存在的不足,提出了一种适合于分布式实时嵌入式系统的调度分析算法。该算法使用相对的触发域判定调度序列中的变迁是否可以调度;通过引入并行间隔,记录了调度序列中的并行变迁的相对执行时间;在计算调度长度时,使用并行间隔作为并行变迁的执行时间,从而得到了正确的调度分析结果。     

基于扩展广义随机时间Petri网的流程银行建模及等价性能分析

对业务流程进行建模和性能分析是流程银行研究的重要课题.通过对广义随机时间Petri网进行扩展,将其用于对流程银行的业务流程建模.同时,基于活动执行时间为正态分布的假设,给出了4种流程元模式的等价性能分析方法.在此基础上,进一步把活动执行时间扩展到任意分布的情况,给出了通用的等价性能分析方法.