基于Petri网的虚拟供应链物流网络优化

为了提高虚拟供应链中的物流运作效率,提出了一种基于Petri网的物流网络优化方法。该方法首先分析虚拟供应链物流的组成,确定库所、变迁及其属性;其次建立物流网络的Petri网模型图和数学规划模型;然后分析物流过程,找出瓶颈环节,并确定重要参数的取值,采用数学规划模型计算各物流指标的最优值。最后,给出了一个对陶瓷产品的虚拟供应链物流网络进行优化的案例。     

企业集群中的供应链网研究

企业集群是当今中小企业发展的重要方向，供应链管理的思想和方法在企业集群中将发挥起越来越重要的作用。本文对企业集群及其特点，企业集群内的供应链管理，供应链网在企业集群中的作用，企业集群内的供应链网特点及新需求进行了一些探讨。     

供应链协同系统的安全体系的设计与实现

为了解决基于互联网的供应链协同系统的信息安全问题,提出了一种层次型安全框架。基于中间件技术设计了供应链协同系统的构架,分别论述了对供应链协同系统中的网络接入安全、数据传输安全、用户身份认证和数据库访问的安全策略等问题,并将多种安全技术集成应用到该框架中。最后,给出了该安全框架的一个具体应用案例。     

MC供应链网络中CODP的分布倾向性研究

在复杂的供应链网络内,存在多个CODP,形成了CODP网络.把CODP网络看作是供应链网络的一个子集,建立了CODP网络分布倾向模型,并利用多维等级法揭示了供应链网络中CODP位置的分布倾向性,证明了根据CODP总体分布倾向性,可以评价企业是否达到既定的满足个性化要求的目标、判断与CODP位置紧密相关的参数(库存、成本、交货期)等,为及时调整生产目标与生产策略提供参考.     

Assurance of system service level robustness in complex supply chain networks

Despite studies that consider service level rates of individual factories in a supply chain system, the interactions between connected factories and the impact of these interactions on the overall supply chain service level rate have been rarely studied. Moreover, due to uncertainties induced by various sources such as transportation delay and manufacturing processes variability, ensuring the robustness of system service level rate while considering these uncertainties in individual factories is a highly complex task. This paper studies uncertainty effect introduced by factory service level rates on the robustness of overall supply chain network performance, and presents a novel robust design optimization methodology to derive designs of factory service level rates in order to satisfy the service level rate requirement of the system and ensure its robustness. A case study with a multi-level multiple factories supply chain network is used to demonstrate the efficacy of the proposed methodology.     

基于时间的制造企业供应链系统Petri网建模分析

针对制造企业供应链的运营情况,结合Petri理论中的广义随机Petri网(GSPN)以及马尔科夫链相关理论对该供应链系统建模分析,为制造企业供应链性能评价提供理论依据。结果表明:通过将GSPN以及其同构的马尔科夫链模型能清晰、快速、直观地获得供应链系统执行订单所需的时间以及供应链系统各主要结构所占系统运行时间的比例大小。该方法能快速地对供应链时间性能以及运作效率分析,为供应链系统进行改进提供思路。     

大规模定制环境下供应链实施延迟生产的成本优化模型

为成功实施延迟生产以实现供应链成本的优化,大规模定制环境下供应链各节点企业需要紧密协作.针对一条包括制造商和供应商两个节点企业的供应链.建立了大规模定制环境下供应链实施延迟生产的成本优化模型.以最小化供应链生产成本为目标,研究了供应商对客户订单分离点决策的影响,以及大规模定制环境下供应链实施延迟生产时客户订单分离点的最佳位置,指出决策客户订单分离点时应考虑供应商成本.最后,对该生产成本优化模型进行了仿真.     

产品开发ProA一般Petri网模型研究

为了定量描述产品开发ProA的内部运行过程,更好地支持产品开发管理,构建了产品开发ProA的一般模型.深入剖析了产品开发ProA的内部运行机理;利用多色集合的着色原理对Petri网进行改进,形成了多色ProA Petri网方法.在此基础上,建立了产品开发ProA的一般Petri网模型.最后,给出了该模型在汽车油泵单向阀测试器开发中的应用情况.     

Analysis of interaction between the barriers for the implementation of sustainable supply chain management

In the contemporary marketplace, it is essential for industries to offer environmentally conscious, “green” products. Because industries are aware of demands from both customers and from government policies towards environmental products, Indian industries are particularly pressured regarding issues of environmental adoption. At this point, they presently have less detailed research on the effects of the adoption of environmental practices using traditional supply chain management (TSCM). One sector that is less aware of environmental initiation practices in the TSCM is the fastener manufacturing industry, but they are in a good position to adopt and to improve their environmental performance. Sustainable supply chain management (SSCM) is an important concept to improve environmental performance in TSCM and to provide a useful green image in industrial products. However, there are many barriers to the successful implementation of SSCM, and it should be noted that not all the barriers carry an equal impact. We need to identify the dominant factors required to adopt the SSCM concept, so that industries need to analyze the barriers and their impacts. The main aim of this paper is to determine the relationship between the barriers and to identify the most influential barriers from the recommended barrier list with the help of interpretive structural modeling. In this study, 13 barriers are considered from the extensive literature available. This study has been conducted in two fastener manufacturing industries that are located in the southern part of India.     

基于随机需求的多级供应链网络优化模型的研究

通过对多产品、多级供应链网络的分析,提出了一种基于随机需求的多级供应链网络的优化模型。采用非线性混合整数数学规划方法,得到的供应链成本最小。针对在供应链中需求的多变性,应用反馈控制器来维持所有节点的产品库存,以此达到供应链的稳定。最后,应用仿真分析了反馈控制器对降低不稳定性的效果。     

制造企业精益供应链物流管理信息系统的研究与实现

立足于精益思想，从精益生产的角度研究了制造企业供应链环境下精益物流管理信息系统的体系结构与功能组织。通过分析信息系统组织中关键的物流信息交流门户、物流要素能力平衡和物流库存控制问题，以价值链理论为指导设计了信息系统主要的功能模块，并结合汽车零部件制造企业对原型系统进行了分析与验证。     

模糊Petri网在电梯故障诊断中的应用

介绍了基于模糊Petri网的知识描述方法及推理算法，并采用模糊Petri网作为电梯故障诊断专家系统中的知识表示方法和推理搜索策略，对故障信息的模糊性和不确定性进行表示和处理，实现了知识表示和推理模型的集成和统一，有效的解决了诊断推理过程中知识表示与推理等关键问题。     

On the suboptimal liveness-enforcing supervisors based on Petri net structural analysis and the theory of regions

In this paper, we proposed a new GM(1, 1) dynamic model which is integrated with a nonlinear exponential smoothing (NES) model to improve the prediction accuracy. The proposed model is defined as the NESGM(1, 1) model and we developed the simulation prediction modeling of the weekly closing stock exchange index of Taiwan based on the proposed model. Furthermore, the original data are preprocessed by a standard normal distribution (SND) to enhance the predictive power of the NESGM(1, 1) model. We also discussed the predicted results compared with the ARIMA model. The experimental results show that the NESGM(1, 1) model has better predictive accuracy. However, as drawbacks, the training and testing times are increased.     

Petri网在工程机械故障诊断中的应用

Petri网是信息处理系统描述和建模的有力工具。扩展Petri网既可以用图形直观地描述设备故障的发生和传播,又可以通过状态方程精确地分析系统行为。本文通过工程机械故障诊断实例测试,表明该方法是快速、准确的。     

具有混合约束的离散事件系统的Petri网控制器的研究

针对由Petri网建模的离散事件系统中具有混合约束的Petri网控制器的设计问题,利用局部设计和Petri网简化技术改进与完善控制器的设计方法,并证明所提方法是最大容许的.先利用局部设计Petri网简化技术把所有约束库所融合为一个与它们标识总量相等的库所,然后再与受约束的变迁进行对照比较,使控制器的设计更为简单并且避免了死锁,尤其是对规模较大的系统,其优势更加明显.针对于约束的不同情况,给出了相应的控制器设计方法,最后通过几个例子对该方法的简单性和有效性进行了验证.     

具有不可控变迁的离散事件系统Petri网控制器的研究

针对基于Petri网建模的离散事件系统的Petri网控制器的设计问题,分析了系统中存在不可控变迁时的情况,并基于局部设计和Petri网简化技术,提出了一种新的控制器设计方法。该方法首先将约束条件分为允许约束和非法约束,并通过矩阵转换方法将非法约束转换为允许约束,然后通过约束矩阵设计出相应的控制器。该方法由于只考虑与约束库所、约束变迁及不可控变迁相关联的局部关联矩阵,降低了矩阵的维数,简化了控制器的设计,避免了死锁。最后,基于两个实例验证了该方法的高效性。     

The development of an object-oriented Petri net cell control model

This paper presents an object-oriented Petri net cell control (OPNCC) model for scheduling and controlling the operations of a flexible manufacturing cell. The development of the OPNCC model includes three phases:

1. Static analysis.
2. Dynamic analysis.
3. Integration.

The dynamic analysis, the most important phase in developing the OPNCC model, will first construct the object-oriented Petri net (OPN) for each physical object and connect all the related “encapsulated” OPNs to be a complete OPN model to represent the dynamic behaviour or control logic of shop floor operations. Then, the control logic of the complete OPN model must be analysed through an object behaviour analysis, an inter-object message passing analysis and a conflict analysis. The OPNCC model not only possesses the characteristics of object-oriented method (e.g. inheritance, encapsulation and a higher degree of flexibility and reusability) and Petri nets (e.g. graphical representation and mathematical analysis capabilities), but also incorporates scheduling/dispatching knowledge in the control logic specified by the OPN model. The practical significance of the OPNCC model is that practitioners may apply it to develop both a real-time cell controller and an off-line shop floor scheduling simulator.     

基于Petri网的自动化立体仓库复合建模研究

阐述了自动化立体仓库的作业流程,针对自动化立体仓库工作环节多、作业复杂的特点,使用Petri网建模和面向对象建模相结合的复合建模方法,建立了自动化立体仓库的整体层次模型和动态模型,提供一种解决复杂系统建模、分析和验证等问题的方法。     

自动化仓库的Petri网建模和路径优化

在仓库的优化过程中，自动化仓库的作业时间包括货物上人库台或下出库台的卸载作业时间，货箱人库时在控制中心的检录时间，货箱在出、人库运输链上运行的平均时间，堆垛机寻址运行时间等，其中堆垛机的寻址、存放货物时间占整个人出库过程的大部分时间，尤其是当大量的货物同时进出库时。