Conception and implementation of a collaborative manufacturing grid

Computer supported collaborative work (CSCW) technology and grid technology are integrated to solve the resource-sharing problems in collaborative design, analysis, and manufacture. The application of grid technology in collaborative manufacturing is presented. Function requirement of collaborative manufacturing grid (CMG) is analyzed for product design, analysis, and manufacture. A concept of the CMG is put forward, and its corresponding architecture is set up based on grid middleware. Grid services in the CMG are realized based on the Globus Toolkit. A grid portal of the CMG based on the Web is developed, and advanced graphical interfaces are provided for potential users. Functions of workflow based on CMG are presented, and its management is discussed for automatic workflow creation and execution in a grid environment. A prototype system is established via a case study of the sightseeing lift. It validates the resource-sharing and cooperative work in the CMG.     

支持大规模定制的商业过程仿真建模研究

根据大规模定制的需要将工作流技术和基于Agent方法进行融合,提出了一种基于Agent增强工作流技术的面向实施的业务过程建模与离散事件分布仿真方案。该方案包括P＿PROCE工作流元模型、一个基于该元模型的工作流系统和一个名为E-Agent的多Agent系统。为了支持该方案,构建了一个Agent增强工作流信息系统,通过该系统,可以对商业过程进行建模、仿真和优化。最后讨论了该系统的结构和实现。     

An ontology-based method for knowledge integration in a collaborative design environment

A collaborative design environment can be viewed as a multi-agent system where each design agent has knowledge about specific domains and can solve different problems. Several agents combine to solve a complex problem through knowledge sharing and inter operation. It is essential to construct an integrated knowledge base to improve the efficiency and consistency of complex problem-solving. An ontology-based knowledge integration framework in a collaborative design environment is presented in this paper. Ontology provides standard vocabulary, technical terminology and a domain model for knowledge integration. The representation and construction of ontology are critic problems for knowledge integration. An object-oriented concept graph representation is presented to represent ontology. It has advantages of both object-oriented methodology and Sowa’s conceptual graph. It can be translated into predicate calculus conveniently, and can represent the intension of concepts. In order to improve the efficiency of ontology construction, a semantic-based approach is presented. Firstly, a semantic affinity based clustering algorithm is presented to generate concepts from the term set of multi-agent systems. Then, ontology is constructed based on knowledge.     

一种网格工作流的时间管理方法

为方便网格工作流的时间管理,提出了一个服务的时间模型,为服务内部流程自动生成一个与之具备等价时间信息的服务,进而提出了网格工作流模型.该模型将网格工作流的时间问题转化为服务的时间问题,并设计了算法,以判定能否满足网格工作流中的时间约束,计算网格工作流的最短执行时间,以及活动的最早和最晚结束时间,从而较好地实现了网格工作流的时间管理.     

网络化制造模式下基于语义网的协同产品配置模型研究

针对网络化制造模式下协同产品配置设计的信息需求,探讨了一种基于语义网的协同产品配置模型。在该模型中提出了一种基于语义网的协同产品配置模型的体系结构,构建了基于语义网的协同产品配置设计过程模型。通过定义协同产品配置信息的语义元数据描述模型来构建统一的协同产品配置本体,并对散布于网络上的协同产品配置资源进行语义标注,使网络化制造环境下协同产品开发企业之间能够共享产品配置信息,提高分布式协同产品配置设计的信息交互效率以及协同产品开发水平。将该模型应用于某网络化协同设计平台,对模型的有效性进行了验证。     

语义网格本体论技术在网络精确搜索方法探析

通过研究P2P网络搜索引擎模式的Gnutella协议,结合语义本体技术,利用节点逻辑构造及节点间语义希哈路由表实现问题关系变换的语义网格本体论方法,用"问-答"式查询模式实现精细、准确和自动化的网络资源的深度搜索。     

基于网络黑板的产品异地设计系统研究与实现

基于黑板模型的基本思想，在Internet上构造基于Web的可视化网络黑板结构，并采用Schema描述黑板结构中的信息与语义模型，实现异构数据源的信息交换。给出了基于多Agent的网络黑板控制机制，以及网络黑板系统各模块的实现结构及功能。构建了基于网络黑板的异地协同设计系统原型模型，对设计任务采用任务分解知识库和人工两种分解方式完成，实现产品异地网上协同设计。     

Exploring Semantic Web technologies for ontology-based modeling in collaborative engineering design

This paper describes a preliminary attempt at using the Semantic Web paradigm, particularly the Web Ontology Language (OWL), for domain-specific engineering design knowledge representation in a multi-agent distributed design environment. Ontology-based modeling to the engineering design knowledge on the Semantic Web is proposed as a prelude to the meaningful agent communication and knowledge reuse for collaborative work among multidisciplinary organizations. Formal knowledge representation in OWL format extends traditional product modeling with capabilities of knowledge sharing and distributed problem solving, and is used as a content language within the FIPA-ACL (Agent Communication Language) messages in the proposed multi-agent system architecture. As an illustration, engineering design knowledge of automatic assembly systems for manufacturing electronic connectors, which contain a group of electro-mechanical components, is represented in OWL format, with its inherent structure-function-process relationships defined explicitly and formally, to facilitate semantic access and retrieval of electro-mechanical component information across different disciplines. The proposed approach is viewed as a promising knowledge-management method that facilitates the implementation of computer supported cooperative work (CSCW) in design of Semantic Web applications.     

以数据为中心的柔性信息系统的建模方法

在认为企业业务的本质是流程性和重组性的前提下,提出了按照统一建模的技术方法,把企业业务按照以事务性工作流模型为核心,进行组织模型、资源模型和相关数据模型的建模;给出了一种面向“人机交互”的事务性工作流模型,并分析了该模型在事务处理和协调调度方面的能力;进一步讨论了在工作流模型的“运行”层面提高柔性的“推拉”模型技术及该模型的构成。在实现技术方面,为了达到建模阶段对系统柔性的要求,分析了系统设计中面向对象方法的应用,并提出在分布式对象计算的技术框架下采用多Agent技术设计工作流模型中的相关活动节点,可以进一步增强系统的柔性。     

PRODUCT-ORIENTED WORKFLOW MANAGEMENT IN CAPP

A product-oriented process workflow management model is proposed based on the multi-agent technology. The autonomy, inter-operability, scalability and flexibility of agent are used to cooperate the whole process planning and achieve the full share of resource and information. Thus, unnecessary waste of human labor, time and work is reduced and the computer-aided process planning (CAPP) system's adaptability and stability are improved. In the detailed implementation, according to the products' BOM (Bill of materials) in structural design, the task assignment, management control, automatic process making, process examination and process sanction are combined into a unified management to make it convenient for the adjustment, control and management.     

网格环境下复杂产品概念设计技术研究

在研究分布式协同产品概念设计系统的基础上,将网格技术、代理和可扩展标记语言技术相融合,以解决分布式环境下多领域设计的协作、模型数据的集成和共享等问题,提高了产品概念设计系统的鲁棒性和问题求解的有效性。从复杂产品概念设计的过程,分析了系统的需求,建立了基于网格服务的复杂产品概念设计系统,阐明了系统的组织结构、通信方式、工作原理和工作流程,给出了产品概念设计支撑平台中涉及的机械、电子、控制和软件等领域的智能代理的统一描述,构建了一个支持分布、异构的多领域协同工作的产品概念设计支撑平台,展望了概念设计技术在仿真系统中的进一步应用。     

基于工作流的采购质量管理系统分析与设计

引入工作流技术对制造企业的采购质量管理体系进行了分析与研究,建立了制造企业采购质量管理的过程模型并基于Petri网构造了其工作流模型。采用J2EE平台设计开发了基于工作流的计算机辅助采购质量管理系统,提供了对过程定义、过程控制与过程集成的支持,从而实现了过程驱动的采购质量管理机制,为提升采购质量管理系统的过程支持能力提供了一种有效的技术方案。     

Decentralized stabilizability and formation control of multi-agent systems with antagonistic interactions

This paper studies the stabilizability and formation control problems of multi-agent systems with antagonistic interactions. The agents run a bipartite consensus protocol using a signed Laplacian which is different from the conventional one. By taking advantage of the proposed structurally balanced independent strongly connected components(SBiSCCs) of the signed graph, a sufficient and necessary condition is presented to solve the decentralized stabilizability problem of multi-agent systems with antagonistic interactions. Besides, formation control is considered and the sufficient and necessary condition is provided by applying the proposed results. Several simulations are given to illustrate the theoretical results.     

基于语义推理的工作流结构验证方法

为了验证工作流结构方面的问题,提出和证明了过程结构验证等同定理和无环工作流结构验证定理,并在这两个定理的基础上,给出了基于语义推理的工作流结构验证算法。最后,在运算复杂程度、循环路由、死锁和同步丢失等4个方面,与其他验证方法进行了比较。     

业务过程执行语言流程语义标注方法研究

为提高工作流模型在分布式执行过程中的自动化程度.解决语义异构问题,提出了一种基于本体的业务过程执行语言语义标注方法,构建了业务工程执行语言流程树和Web本体描述语言领域本体树.针对业务工程执行语言流程中的每个概念,分别从三个角度计算其与Web本体描述语言领域本体中所有概念之问的语义相似度,并选取与该概念复合相似度最大的概念建立映射关系.通过语义消歧过程.消除业务工程执行语言流程中存在的语义异构,并生成语义消歧树,进而基于一系列映射规则,将语义消歧树转化为Web服务本体描述语言描述的语义工作流模型.最后给出应用实例,并采用F1-measure对所提出的语义消歧方法进行评估.     

A grid-based agile process preparation system

Manufacturing enterprises are now facing serious challenges that have been evident and moreover closely associated with the dynamics of globalization. After analyzing the features of process preparation and grid technology, a grid-based agile process preparation system is presented. Firstly, the concept of digitization agile process preparation is put forward and a proposed framework to support DAPPS is followed. Secondly, with grid technology introduced into process preparation research, a six-layer agile process preparation system grid (APPSG) is constructed. Thirdly, by studying the mapping between tasks and workflow the application process of APPSG is derived. Finally, the application steps are illustrated by an example. The research in this paper, however, is beneficial to the application of manufacturing grid and information sharing of national defense industry.     

基于TMS320F2812的船舶电网短路电流自动录波软件设计与实现

针对船舶直流幅压电网短路故障电流上升率高、幅值大的特点,对一种结合电流上升率和电流幅值的短路故障判据算法进行了研究,提出了一种基于TMS320F2812 DSP处理器平台的短路电流自动录波软件设计方案,对录波软件的工程实现方法、工作流程和通信协议设计等作了重点说明,利用脉冲功率发生器测试电路对录波软件的效能进行了测试.研究结果表明,该录波软件能够实现短路故障电流自动检测及短路全过程电流波形自动记录且实时性强,能为船舶电网事故后分析提供重要的数据.     

基于设计协作环的产品方案设计工作流模型及实现

产品方案设计阶段是决定产品质量、企业市场竞争力最为关键的阶段;不同企业通过组合各自优势资源进行企业协作则是提高市场竞争力的一个重要途径。在对面向质量的产品方案设计过程进行分析的基础上,提出设计协作环的概念,建立了基于设计协作环的工作流模型,并通过引入多代理技术,建立了支持该工作流模型的系统实现结构。     

大批量定制设计研究现状

大批量定制是制造业发展的必然趋势 ,任何生产方式都需要一定设计方法的支持 ,实现大批量定制所需要的设计方法称为大批量定制设计。该设计方法试图从设计流程、设计方法、支持技术等方面 ,以实现大批量定制为核心 ,对已有设计方法进行系统的整理和改进扩展 ,从而形成大批量定制生产模式下的设计理论体系。本文从上述三个方面对大批量定制设计的研究现状进行了分析 ,介绍了大批量定制设计的基本概念和设计流程的变化 ,讨论了大批量定制设计的基本方法 ,给出了实现大批量定制设计所需技术及发展现状。     

基于Petri网的产品研发设计工作流的柔性建模方法

为了解决复杂产品研发设计工作流建模问题,提高产品研发设计工作流管理系统在运行中对动态变化的响应能力,提出了一种基于Petri网的柔性建模方法。该方法结合面向对象和分层的思想对Petri网进行扩展,利用优先级、变迁触发规则等属性规则描述了模型的柔性。该方法不仅可以降低产品研发设计工作流建模的复杂度,还可以支持产品研发设计工作流管理系统对资源调度、动态选择和异常响应的柔性控制。最后通过一个实例说明了该方法的可行性。