抗联盟攻击的虚拟企业安全交互认证方案

针对现有虚拟企业交互认证方案中存在的安全问题,提出了一个抗联盟攻击的广义虚拟企业交互信任方案.该方案通过赋予虚拟企业盟主关于私钥的一个决定因子,使得虚拟认证中心的私钥生成和证书颁发必须有盟主的参与,并保持了信任权限可灵活分配的优点,同时完善了虚拟企业信任交互方案的安全性.分析表明,该方案可以防范那些已退出联盟的恶意成员对系统的联盟攻击,适合复杂动态的虚拟企业环境.     

基于可变权限集的广义虚拟企业信任交互方案

提出了一个基于可变权限集的广义虚拟企业信任交互方案,该方案能够根据虚拟企业的不同组织模式灵活设置成员权限集,并在成员结构发生变化时,对其进行动态调整.通过设计相应的虚拟认证中心来创建和颁发虚拟认证中心证书,在成员增减阶段变更参与方协议,有效解决了虚拟企业在各种组织模式下的信任交互问题.此外,该方案还实现了基于Pedersen可验证秘密共享技术的分布式密钥生成,既防止了密钥分发和更新过程中成员的不诚实行为,又克服了盟主单独行使密钥分发权利所带来的安全隐患.分析表明,该方案不但安全性大大增强,而且能够更好地适应虚拟企业复杂多变的动态环境.     

虚拟企业细胞式治理体系

为实现虚拟企业的协同运作与资源优化配置,保障总体任务的完成,建立了细胞式治理体系结构,通过重构进化适应环境的复杂性和动态性.在该体系中,核心企业组成的细胞核系统是控制中心,成员企业构成的细胞质系统提供了不可或缺的功能单元,信息技术治理构成生物膜系统为虚拟企业治理活动提供了必需的信息技术支持.核心企业和成员企业根据各自所承担总体任务过程中的子任务价值系数,采用耦合程度不同的多元化治理结构安排.非正式社会机制是虚拟企业正式治理机制的有力补充.虚拟企业细胞式治理体系结构是一个虚拟企业治理的集成化通用理论分析和结构设计框架,可以为虚拟企业的结盟和治理提供理论指导.     

基于工期约束的动态联盟伙伴选择

具有项目投标价格和完工时间因素的带工期约束的伙伴选择问题是企业动态联盟的基本问题,证明了该问题是NP完全问题。为设计求解该问题的分支定界算法,建立了非线性整数规划模型。证明了模型中目标函数和约束函数的单调性,并利用单调性给出了判断问题无解和问题最优解已知的条件,构造了收缩求解区域的二分法。实验表明,基于这些结果所构造的分支定界算法是有效的。     

Constrained behavior manipulation for interactive assembly in a virtual environment

Interactive assembly based on virtual reality offers users an opportunity to interact with a virtual prototyping rather than a physical one and to validate assembly performance of products in a realistic way. Such evaluations could be available very early in the product development process ahead of any physical prototyping. The reduction or elimination of physical prototyping needed for assembly performance validation can substantially shorten the product development cycle and reduce development cost. Although virtual reality technology provides users an intuitive and immersive 3D interactive interface, it tends to be inaccurate because humans have difficulty in performing precise positioning tasks. Therefore, it is necessary to implement effective motion manipulation for assembly operations so that users can perform precise positioning efficiently in virtual assembly systems. This paper presents a constrained behavior management approach that realizes assembly relationship recognition, constraint solution and constrained motion for interactive assembly in a virtual environment. A constrained behavior manager (CBM) has been developed and applied in virtual assembly systems. Test cases confirm that constrained behavior manipulation proposed in this paper not only increases the efficiency of assembly relationship recognition, but also facilitates assembly interaction in a virtual environment.     

虚拟企业中供应链管理的研究

主要研究虚拟企业和供应链管理的运作原理和技术 ,提出虚拟企业供应链管理运行的生产计划、采购、库存和销售管理模式 ,并分析一具体实例     

An agent-based infrastructure for virtual enterprises using Web-Services standards

Nowadays, most products in the market are increasing unlikely manufactured entirely within a single company. Instead, a network of manufacturing companies, usually known as a Virtual Enterprise, is involved. Each of the companies becomes a node in the network to play a role in the value-adding process in the production cycle. In other words, a Virtual Enterprise (VE) is an ad hoc organization that combines the competencies of its partners and commits its resources flexibly to respond to business opportunities. To facilitate effective collaboration, suitable information systems that can enable VE partners to communicate and share data, information and knowledge across organizational boundaries are essential. One of the major obstacles towards achieving this goal is a lack of standardized technologies to allow partnering enterprises to publicise their services and expertise as well as locating and interacting with one another in a dynamic fashion. This paper proposes a multi-agent infrastructure to manage VEs and support XML-based agents coordination using a contract net protocol and Web Services standards. Feasible agent-based architectures for partnering enterprises are also suggested and illustrated.     

虚拟企业经营过程仿真的联邦建模框架

为使虚拟企业的经营过程仿真建模能快速地响应虚拟企业的变化,提出了一个支持虚拟企业经营过程仿真模型重用、重构和规模扩展的联邦建模框架。该框架分为两个阶段,在成员企业经营过程仿真建模阶段,为了重用成员企业的经营过程仿真模型,成员企业的经营过程被分为外部触发过程、内部触发过程和混合触发过程,将每个外部触发过程仿真模型和混合触发过程仿真模型作为一个原子经营过程仿真模型来建立。在虚拟企业经营过程仿真建模阶段,通过组合成员企业的原子经营过程仿真模型,以经营过程仿真联邦的方式,建立虚拟企业经营过程的仿真模型。讨论了基于高层体系结构实现虚拟企业经营过程仿真联邦建模的关键技术。最后,结合某型号直升机旋翼虚拟设计过程,给出了建立虚拟企业经营过程仿真模型的实例。     

虚拟企业资源结盟博弈的启发式遗传算法

将制造企业联合生产问题归结为一类资源结盟博弈问题,每个企业持有的资源,不足以满足其生产目标要求,而通过建立联盟则可相互合作,各自实现目标。从考察企业联盟稳定性入手,基于目标可行性及联盟相容性等概念,深入分析了联盟及其目标集之间的约束关系。采用评价函数来判断企业联盟的稳定性,设计了交叉修正算子、变异算子等启发式遗传算子,提出了求解稳定联盟的遗传算法。启发式遗传算子充分利用了资源结盟博弈领域知识,能够引导染色体避开不可行解,并快速向最优解方向进化,算法具有更好的搜索性能。