复制式协同CAD基础平台研究
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摘要
计算机网络技术、网格计算、并行工程技术以及CAD/CAM相关技术的发展,改变了产品开发模式,促进了网络化产品设计的需求与应用。论文系统地研究了复制式协同CAD基础平台的相关理论与实现技术,为实现产品的实时协同开发提供了一种解决方案。
论文从课题的研究背景出发,对协同CAD基础平台的关键技术——协同数据交换、并发控制机制、协同数据安全以及迟加入机制的概念、特点以及国内外研究现状进行了归纳和总结,指出了存在的主要问题和不足,并预测了其发展趋势,为全文的研究奠定了基础。
论文在研究协同实时造型特点的基础上,构建了复制式协同CAD基础平台的网络拓扑及其功能框架,并为支持网络协同设计,对CAD平台、网络数据通讯以及多媒体交流等构成的支撑环境进行了特殊处理与优化,为如何构造协同CAD系统提供了理论支持和依据。
协同数据交换用于保证整个协同系统的工作效率和用户体验。论文在深入研究复制式协同CAD环境下数据交换特点的基础上,提出了基于隐式特征表达的协同数据交换方法。该方法不需要交换模型的几何拓扑信息,而只需交换参数化信息,几何拓扑模型则由系统调用本地几何建模引擎重构,并通过利用面向对象的隐式特征消息类封装、网络序列化传输技术、语义特征重构技术以及基于面向对象的动态八叉树几何匹配技术,实现了网络实时协同造型。实践证明,该方法能极大降低网络数据传输量,提高网络造型的实时性。
并发控制机制用于约束各协同用户的操作和规范设计时序。论文在深入研究CAD特征之间的复杂关系(如依赖关系、空间关系等)对并发操作冲突影响的基础上,提出了复制式协同CAD环境下的分层分布式并发控制模型。该模型以特征为基本的并发控制单元,设定了并发操作冲突、并发逻辑冲突、并发依赖冲突以及并发意图冲突的四层递进式检测规则,并运用分布式互斥算法,构建了系统自动协调、冲突双方协商以及第三方仲裁的分层冲突协调机制,实现了对并发操作的有效控制,并用实例验证了该算法的可行性与有效性。
访问控制机制用于保证协同设计数据的机密性和完整性。论文在深入研究CAD模型层次结构和自主角色委托的基础上,提出了复制式协同CAD环境下多粒度动态安全访问控制模型。该模型将访问权限进行多粒度划分和量化处理,简化了权限集的计算,借鉴了工作流中的权限依赖关系和状态迁移概念,实现了权限的动态激活及细粒度调整,并利用基于信任度的委托属性表达式,实现了受托者资格筛选,最后通过对委托限制进行分类和组合,引入了委托条件及受控使用概念,实现了委托权限的条件委托及约束使用。实践证明,该模型可以对协同数据访问进行有效地控制,符合设计任务间的分工性、依赖性和交互性的特点。
迟加入机制用于保证迟加入进程与当前设计进程的同步性。论文在深入研究了加入机理的基础上,提出了复制式协同CAD环境下带容错机制的三多播组结构分布式“迟加入”算法,并详细探讨了算法实现的各个关键问题。实例分析表明该算法能有效降低初始化延迟、网络负荷和应用程序负担。
为了实现产品的网络协同设计,作者开发了复制式协同CAD原型系统。该系统紧密结合网络协同的思想,把实时协同设计作为其实现目标,实现了CAD技术和网络技术的无缝集成。
The development of computer network, grid computing, concurrent engineering and CAD/CAM technologies not only changes dramatically the model of production process, but also accelerates the demand and application of internet product design. This paper systematically presents theories and technologies related to the basic platform and propose a solution to the real-time designing of product.
This dissertation starts with the background of the research about Collaborative CAD, and presents in details about the key technologies about the fundamental platform—concepts ,futures and the current situation around the world about data exchange、concurrency control、access control and late join mechanism. This is also the basis of the dissertation.
Based on the research of real-time modeling, this dissertation also constructs the replicated Collaborative CAD network topology and its functional frame. In order to support Collaborative design, we did some special operations and optimizations about CAD platform, supporting environment of Data communication and multimedia communication. This research work provides theory support and evidence for how to build a Collaborative CAD System.
Data exchanging is used to ensure the efficiency and user experience of the whole collaborative system. An implicit feature representation data exchange model is proposed based on a deep research about the virtues of data exchanging for replicated collaborative CAD system. In essence, instead of exchanging geometry and topology information, only parametric information of features is exchanged, and geometry and topology information are left to evaluate by CAD system internal environment. To accommodate Collaborative real-time modeling, object-oriented serializable class message encapsulation、semantic feature re-construction and geometric matching based on dynamic octree technology are used to make the internet transmit more efficient, and implicit model exchange based on features is implemented. This method is proved to be efficiency on improving the performance of Internet and enhancing the quality in real-time.
Concurrency control is used to constrain users’operations and rule the time schedule of designing. A multi-level distributed concurrency control model is proposed for replicated collaborative CAD system based on understanding the effect of the complicated relationships among CAD features (e.g. dependent relationship, geometrical relationship) to the confliction of collaborative operations. Using feature as its basic control unit, this concurrency control mechanism settles four progressive confliction detect rules, including collaborative operations rules, collaborative logic rules, collaborative dependence rules and collaborative concept rules. It also constructs a self-compatible, conflict-meditation and third-lateral-judge multi-layer confliction mediation mechanism based on the distributed mutual exclusion algorithm, and the multi-level distributed concurrency control is implemented. This method is proved to be efficiency and feasibility on controlling collaborative operations.
Access control is used to ensure the confidentiality and integrity of the collaborative design data. A multi-grained and dynamic security access control (MGDAC) model is proposed based on understanding about the characteristics of the CAD model hierarchy and role-based delegation for replicated collaborative CAD system. A multi-grained quantified privilege model is developed to simplify the process of permission assignment and calculation for enriching the expression ability and helping to realize fine-grained access control. The dependent relation of permission and the permission state migration are brought into MGDAC for dynamic authorization management based on the basic theory of workflow. The delegation attribute expression and delegation trustworthiness are brought into MGDAC for delegatee's qualification filtrating. Three types of delegation constraints are further studied and analyzed, including temporal, globalization and obligation. Using these constraints, delegation condition and constrained usage is described. Based on the practice, MGDAC model is more efficient to control collaborative operations. It meets the characters of design tasks, i.e. separate working ability, dependency and interactivity.
Late join mechanism is used to keep the latecomers consistent with current working process. A distributed late join algorithm with fault-tolerance based on three multicast group (T-MDLJ) is proposed for replicated collaborative CAD system. The latecomers joining mechanism has been analyzed and key issues of late join algorithms are discussed in detail. The simulation test shows that the T-MDLJ algorithm reduces the initialization delay, network and application load efficiently. To the problem of digital support for internet-based collaborative design, Prototype system of Replicated Collaborative CAD System is designed, and CAD is implemented in network.
论文从课题的研究背景出发,对协同CAD基础平台的关键技术——协同数据交换、并发控制机制、协同数据安全以及迟加入机制的概念、特点以及国内外研究现状进行了归纳和总结,指出了存在的主要问题和不足,并预测了其发展趋势,为全文的研究奠定了基础。
论文在研究协同实时造型特点的基础上,构建了复制式协同CAD基础平台的网络拓扑及其功能框架,并为支持网络协同设计,对CAD平台、网络数据通讯以及多媒体交流等构成的支撑环境进行了特殊处理与优化,为如何构造协同CAD系统提供了理论支持和依据。
协同数据交换用于保证整个协同系统的工作效率和用户体验。论文在深入研究复制式协同CAD环境下数据交换特点的基础上,提出了基于隐式特征表达的协同数据交换方法。该方法不需要交换模型的几何拓扑信息,而只需交换参数化信息,几何拓扑模型则由系统调用本地几何建模引擎重构,并通过利用面向对象的隐式特征消息类封装、网络序列化传输技术、语义特征重构技术以及基于面向对象的动态八叉树几何匹配技术,实现了网络实时协同造型。实践证明,该方法能极大降低网络数据传输量,提高网络造型的实时性。
并发控制机制用于约束各协同用户的操作和规范设计时序。论文在深入研究CAD特征之间的复杂关系(如依赖关系、空间关系等)对并发操作冲突影响的基础上,提出了复制式协同CAD环境下的分层分布式并发控制模型。该模型以特征为基本的并发控制单元,设定了并发操作冲突、并发逻辑冲突、并发依赖冲突以及并发意图冲突的四层递进式检测规则,并运用分布式互斥算法,构建了系统自动协调、冲突双方协商以及第三方仲裁的分层冲突协调机制,实现了对并发操作的有效控制,并用实例验证了该算法的可行性与有效性。
访问控制机制用于保证协同设计数据的机密性和完整性。论文在深入研究CAD模型层次结构和自主角色委托的基础上,提出了复制式协同CAD环境下多粒度动态安全访问控制模型。该模型将访问权限进行多粒度划分和量化处理,简化了权限集的计算,借鉴了工作流中的权限依赖关系和状态迁移概念,实现了权限的动态激活及细粒度调整,并利用基于信任度的委托属性表达式,实现了受托者资格筛选,最后通过对委托限制进行分类和组合,引入了委托条件及受控使用概念,实现了委托权限的条件委托及约束使用。实践证明,该模型可以对协同数据访问进行有效地控制,符合设计任务间的分工性、依赖性和交互性的特点。
迟加入机制用于保证迟加入进程与当前设计进程的同步性。论文在深入研究了加入机理的基础上,提出了复制式协同CAD环境下带容错机制的三多播组结构分布式“迟加入”算法,并详细探讨了算法实现的各个关键问题。实例分析表明该算法能有效降低初始化延迟、网络负荷和应用程序负担。
为了实现产品的网络协同设计,作者开发了复制式协同CAD原型系统。该系统紧密结合网络协同的思想,把实时协同设计作为其实现目标,实现了CAD技术和网络技术的无缝集成。
The development of computer network, grid computing, concurrent engineering and CAD/CAM technologies not only changes dramatically the model of production process, but also accelerates the demand and application of internet product design. This paper systematically presents theories and technologies related to the basic platform and propose a solution to the real-time designing of product.
This dissertation starts with the background of the research about Collaborative CAD, and presents in details about the key technologies about the fundamental platform—concepts ,futures and the current situation around the world about data exchange、concurrency control、access control and late join mechanism. This is also the basis of the dissertation.
Based on the research of real-time modeling, this dissertation also constructs the replicated Collaborative CAD network topology and its functional frame. In order to support Collaborative design, we did some special operations and optimizations about CAD platform, supporting environment of Data communication and multimedia communication. This research work provides theory support and evidence for how to build a Collaborative CAD System.
Data exchanging is used to ensure the efficiency and user experience of the whole collaborative system. An implicit feature representation data exchange model is proposed based on a deep research about the virtues of data exchanging for replicated collaborative CAD system. In essence, instead of exchanging geometry and topology information, only parametric information of features is exchanged, and geometry and topology information are left to evaluate by CAD system internal environment. To accommodate Collaborative real-time modeling, object-oriented serializable class message encapsulation、semantic feature re-construction and geometric matching based on dynamic octree technology are used to make the internet transmit more efficient, and implicit model exchange based on features is implemented. This method is proved to be efficiency on improving the performance of Internet and enhancing the quality in real-time.
Concurrency control is used to constrain users’operations and rule the time schedule of designing. A multi-level distributed concurrency control model is proposed for replicated collaborative CAD system based on understanding the effect of the complicated relationships among CAD features (e.g. dependent relationship, geometrical relationship) to the confliction of collaborative operations. Using feature as its basic control unit, this concurrency control mechanism settles four progressive confliction detect rules, including collaborative operations rules, collaborative logic rules, collaborative dependence rules and collaborative concept rules. It also constructs a self-compatible, conflict-meditation and third-lateral-judge multi-layer confliction mediation mechanism based on the distributed mutual exclusion algorithm, and the multi-level distributed concurrency control is implemented. This method is proved to be efficiency and feasibility on controlling collaborative operations.
Access control is used to ensure the confidentiality and integrity of the collaborative design data. A multi-grained and dynamic security access control (MGDAC) model is proposed based on understanding about the characteristics of the CAD model hierarchy and role-based delegation for replicated collaborative CAD system. A multi-grained quantified privilege model is developed to simplify the process of permission assignment and calculation for enriching the expression ability and helping to realize fine-grained access control. The dependent relation of permission and the permission state migration are brought into MGDAC for dynamic authorization management based on the basic theory of workflow. The delegation attribute expression and delegation trustworthiness are brought into MGDAC for delegatee's qualification filtrating. Three types of delegation constraints are further studied and analyzed, including temporal, globalization and obligation. Using these constraints, delegation condition and constrained usage is described. Based on the practice, MGDAC model is more efficient to control collaborative operations. It meets the characters of design tasks, i.e. separate working ability, dependency and interactivity.
Late join mechanism is used to keep the latecomers consistent with current working process. A distributed late join algorithm with fault-tolerance based on three multicast group (T-MDLJ) is proposed for replicated collaborative CAD system. The latecomers joining mechanism has been analyzed and key issues of late join algorithms are discussed in detail. The simulation test shows that the T-MDLJ algorithm reduces the initialization delay, network and application load efficiently. To the problem of digital support for internet-based collaborative design, Prototype system of Replicated Collaborative CAD System is designed, and CAD is implemented in network.
引文
[1] Randali Whitaker. Computer Supported Cooperative Workand GroupWare[J].Overview Definitions and Distinctions,http://www.informatik.umu.sel-rwhit/CSCW.html
[2] Cutkosky M R, Engelmore R S, Fikes R et al. PACT: An Experiment in Integrating Concurrent Engineering Systems[J]. IEEE Computer, 1993,26(1):28-37
[3]郭凯.基于异构CAD平台的协同设计系统研究[D].沈阳工业大学硕士论文,2007
[4] Ahn S H, Sundararajan V, Smith C E, Kannan B B, Souza R D, Sun G, Mohole A, Wright P K, Kim J, McMains S, Smith J, Sequin C H. CyberCut: an internet-based CAD/CAM system[J].Joumal of Computing and Information Science in Engineering, 2001, 1(1): 52-59
[5] Kim C Y, Kim N, Kim Y, Kang SH, Grady P O. Internet-based Concurrent Engineering: An Interactive 3D System with Markup[R]. In: CD-ROM Proceedings of the 1998 ASME Computers in Engineering Conference, Atlanta, 1998
[6] Lee J Y, Kim H, Han S B, Park S B. Network-Centric Feature-Based Modeling[J].Proceedings of Pacific Graphics '99, Kim, M.-S. and Seidel, H.-P(Eds.), IEEE Computer Society, CA, 1999,280-289
[7] Bidarra R, van den Berg E, Bronsvoort W F. Cottaborative modeling with features[R].In: CD-ROM Proceedings of 2001 ASME Design Engineering Technical Conferences,Pittsburgh, Pennsylvania,2001
[8] Dietrich U, Von Lukas U, Morche I. Cooperative modeling with TOBACO[J].Proceedings of the TeamCAD97 Workshop on Collaborative Design,1997, (5):115-122
[9] Chan S, Wong M, Ng V. Collaborative Solid Modeling on the WWW[J]. Proceeding s of the 1999 ACM Symposium on Applied Computing, 1999, (3):3598-602
[10]何发智,高曙明,王少梅,孙国正.基于CSCW的CAD系统协作支持技术与支持工具的研究[J].计算机辅助设计与图形学学报,2002 14(2): 163-167
[11]何发智,王少梅,孙国正,高曙明.协同集成设计环境的计算机辅助工具[J].机械工程学报, 2002, 38(6): 16-20
[12]谢洪潮,陈大融,孔宪梅.分布式模块化协同设计方法[J].机械设计,2002, 5 (5):7-11
[13]张友良,汪惠芬.异地协同设计制造关键技术及系统实现[J].工程设计,2002, 9 (2):53-59
[14]孔振宇,于华,刘晋春.敏捷制造环境下的线切割CAD/CAM系统[J].中国机械工程,1998, 9 (6): 32-35
[15]姜波,卜佳俊.基于Internet的图案协同设计中迟加入问题的研究[J].计算机工程,2003,28(4): 88-89
[16]方萃浩,叶修梓,彭维等.协同环境下CAD模型的多层次动态安全访问控制[J].软件学报,2007,18(9):2295-2304
[17]方萃浩,彭维,叶梓修.以网络为中心的几何造型技术[J].计算机辅助设计与图形学学报,2005,17(5):879-888
[18]高曙明,何发智.分布式协同设计技术综述[J].计算机辅助设计与图形学报, 2004, 16(2): 149-157
[19] Wu D, BhargavaS, Sarma R. Solid Model Streaming as a Basis for a Distributed Design Environment[R]. In: Proceedings of ASME Design Engineering Technical Conferences, Baltimore, Maryland,2000
[20] Agrawal A K, Ramani K, Hoffmann C M. CADDAC: Multi-Client collaborative Shape Design System With Server-Based Geometry Kernel[J]. Journal of Computing and Information Science in Engineering, 2003, 3(2):170-174
[21]周勋,李洁等.基于Internet的协同实体建模系统的设计与实现[C].第12届全国计算机辅助设计与图形学学术会议论文集,贵阳,2002,720-725
[22]鲁泳,廖文和,黄翔等.异构CAD系统零件库几何信息交换的研究[J].机械科学与技术, 2004, 23 (10) :1166-1168
[23]张必强,邢渊,阮雪榆.分布式同步协同设计中基于三角网格模型的实时传输[J].中国机械工程, 2003, 13(4):305-308
[24]刘云华,陈立平,钟毅.利用设计历史实现异构CAD系统特征信息交换[J].中国机械工程, 2003,14 (21):1845-1847
[25]汪慧芬,张友良,曹健.基于特征的协同设计[J].计算机辅助设计与图形学报,2001,13(4):367
[26] Ellis C A, Gibbs S J. Concurrency Control in Groupware Systems[R]. Proceedings of 1989 ACM SIGMOD International Conference on the Management of Data, Portland, Oregon. 1989: 387-423.
[27] Ellis C A, Rein G L. Groupware Some Issues and Experiences[J]. Communications of the ACM, 1991, 31(1): 32-68.
[28] Liu F, Luh P, Moser B. Scheduling and Coordination of Distributed Design Projects[J]. Annals of CIRP, 1998, 47(1): 111-114.
[29] Brayner A, Harder T, Ritter N. Semantic Serializability: A Correctness Criterion for Processing Transactions in Advanced Database Applications[J]. Data & Knowledge Engineering, 1999, 31(1).
[30]赵蓉,史维峰,郑超.协同CAD系统中的并发控制机制[J].计算机工程,2007,33(18):106-108
[31] Greenberg S, Marwood D. Real-time groupware as a distributed system: Concurrency control and its effect on the interface[R]. In:Proceedings of ACM Conference on Computer SupportedCooperative Work, Chapel H ill, 1994, 207- 217
[32] W. D. Li, S. K. Ong, J. Y. H. Fuh, Y. S. Wong, Y. Q. Lu and A. Y. C. Nee.Feature-based design in a distributed and collaborative environment[J]. CAD Computer Aided Design,2004, 36(9):775-797
[33] J. Y. Chen, Y. S. Ma, C. L. Wang and C. K. Au. Collaborative design environment with multiple CAD systems[J]. Computer-Aided Design and Applications, 2005, 2(1-4), 367-376.
[34] M. Li, S. M. Gao and C. C. L. Wang. Real-time collaborative design with heterogeneous CAD systems based on neutral modeling commands[J]. Journal of Computing and Information Science in Engineering, 2007, 7(2):113–125
[35] Suleiman M, Cart M, Ferrie J. Serialization of concurrent operations in a distributed collaborative environment[J]. In:Proceedings of ACM SIGGROUP Conference on Supporting GroupWare, Phoenix, 1997,435- 445
[36] Ressel M, NitscheRuhland D, Gunzenhauser R. An integrating transformation oriented approach to concurrency control and undo in group editor[R]. In: Proceedings of ACM Conference on Computer Supported Cooperative Work, Cam b ridge, 1996,288- 297
[37] Sun CZ, Ellis C. Operational transformation in real-time group editors: Issues, algorithms, and achievements[R].In: Poltrock S, ed. Proc. of the ACM Conf. on Computer Supported Cooperative Work. Seattle: ACM Press, 1998,59-68
[38] Sun CZ, Jia XH, Zhang YC, Yang Y. A generic operation transformation scheme for consistency maintenance in real-time cooperative editing systems[R]. In: Stephen C, ed. Proc. of the ACM SIGGROUP Conf. on Supporting Group Work. Phoenix: ACM Press, 1997,425-434
[39]杨光信,美林全.制结构下基于对象数据模型的并发控制[J].计算机学报,2000,23(2):113-125
[40] Nam TJ [1998]:“An Investigation of Multi-user Design Tools for Collaborative 3D Modelling[R]. Conference on Computer Supported Cooperative Work,Doctoral Colloquium,November 1998,Seattle.
[41] Nam T,Wright D. The Development and Evaluation of Syco3D:A Real-Time Collaborative 3D CAD System[J]. Design Studies,2001,22:557-582
[42] Dietrieh U,Von Lukas U,Morche I. Cooperative modeling with TOBACO[R]. Proceedings of the TeamCAD97 Workshop on Collaborative Design,Atlanta,1997,115-122
[43] T. J. Nam and D. Wright. The development and evaluation of Syco3D:a real-time collaborative 3D CAD system[J]. Design Studies, 2001, 22(6), 557–582
[44] M. Tang, S.C. Chou, J.X. Dong. Collaborative virtual environment for feature based modeling[R]. in: Proceedings of 2004 International Conference on Virtual Reality Continuumand its Applications in Industry, Singapore, 2004, 120–126
[45] X. Zhou, J. Li, F. Z. He and S. M. Gao. A web-based synchronized collaborative solid modeling system[J]. Chinese Journal of Computer Integrated Manufacturing Systems, 2003, 9(11): 960–965
[46] E. Chan and K. M. Yu. A concurrency control model for PDM systems[J]. Computers in Industry, 2007, 58(8-9): 823–831
[47] Anderson J P. Computer security technology planning study[R]. Air Force Electronic System Division, Hanscom AFB, Bedford, MA: Technical Report ESDTR-73-51, 1972
[48] Bell DE, Lapadula LJ. Secure Computer Systems: Mathematical Foundations[C]. Vol. 1. Bedford: The Mitre Corporation, 1973
[49] Harrison MA, Ruzzo WL, Ullman JD. Protection in operating systems[J]. Communications of ACM, 1976, 19(8):461-471
[50] Department of Defense. Trusted computer system evaluation criteria (TESEC) [R]. Technical Report, DOD 5200.28-STD, 1985
[51] Ferraiolo D, Kuhn DR. Role-Based access control[R]. In: Proc. of the 15th National Computer Security Conf, 1992, 554-563
[52] Sandhu R, Coyne EJ, Feinstein HL, Youman CE. Role-Based access control models[J]. IEEE Computer, 1996, 29(2):38-47
[53] Sandhu R, Bhamidipati V, Munawer Q. The ARBAC97 model for role-based administration of roles[J]. ACM Trans. on Information and System Security (TISSEC), 1999, 2(1):105-135
[54] Sandhu R, Munawer Q. The ARBAC99 model for administration of roles[J]. In: Proc. of the 15th Annual Computer Security Applications Conf. Washington: IEEE Computer Society, 1999, 229-238
[55] Ferraiolo DF, Sandhu R, Gavrila S.Proposed NIST standard for role-based access control[J]. ACM Trans. on Information and Systems Security (TISSEC), 2001, 4(3):224-274
[56] Thomas RK, Sandhu RS. Task-Based authentication control (TBAC): A family of models for active an enterprise-oriented authentication management[R]. In: Proc. of the 11th IFIP Conf. on Database Security,1997, 11-13
[57] Oh S, Park S. Task-Role-Based access control model[J]. Information System, 2003, 28(6): 533-562.
[58] Park J, Sandhu R. Towards usage control models: Beyond traditional access control[R]. In: Proc. of the 7th ACM Symp. on Access Control Models and Technologies,2002,57-64
[59] Park J, Sandhu R. The UCONABC usage control model[J]. ACM Trans. on Information and System Security, 2004, 7(1):128-174
[60] Sandhu R, Park J. Usage control: A vision for next generation access control[R]. In Proc. of the 2nd Int’l Workshop on Mathematical Methods, Models and Architectures for Computer Networks Security. LNCS 2776, 2003, 17-31
[61] Lampson BW. Protection[J]. Operating System Rev., 1974, 8(1):18-24
[62] Shen HH, Dewan P. Access control for collaborative environments[R]. In: Proc. of the 1992 ACM Conf. on Computer-Supported Cooperative Work. New York: ACM Press,1992,51-58
[63] Bullock A, Benford S.An access control framework for multi-user collaborative environments[R]. In: Proc. of the Int'l ACM SIGGROUP Conf. on Supporting Group Work (GROUP '99).New York: ACM Press, 1999, 140-149.
[64] Shyamsundar N, Gadh R. Internet-Based collaborative product design with assembly features and virtual design spaces[J]. Computer-Aided Design, 2001, 33(9):637-651
[65] van der Hoeven A, ten Bosch O, van Leuken R, van der Wolf P. A flexible access control mechanism for CAD frameworks[R]. In: Proc. of the Conf. on European Design Automation. Los Alamitos: IEEE Computer Society Press, 1994, 188-193
[66] Cera CD, Kim T, Han JH, Regli WC. Role-Based viewing envelopes for information protection in collaborative modeling[J]. Computer-Aided Design, 2004, 36(9):873-886
[67] S. Floyd, V. Jacobson, C. Liu, S. McCanne ,L. Zhang. A reliable multicast framework for leight-weight sessions and application level framing[J]. In: IEEE/ACM Transactions on Networking, 1997, 5(6):784-803
[68] J. F. Patterson, M. Day and J. Kucan, Notification servers for synchronous groupware[R]. In: Proc. of the ACM conference on Computer supported cooperative work(CSCW),1996,122
[69] W. Geyer and W. Effelsberg. The Digital Lecture Board- A Teaching and Learning Tool for Remote Instruction in Higher Education[R]. In: Proc. of 10th World Conference on Educational Multimedia (ED-MEDIA)’98, 1998
[70] M. Handley, and J. Crowcroft. Network text editor(NTE): A scalable shared text editor for the MBone[R]. In: Proc. of the ACM SIGCOMM’97, 1997, 197 - 208
[71]刘新福,王光彩,代雯君,顾君忠.集中式CSCW环境中对实时共享对象的并发控制算法[J].小型微型计算机系统, 2002, 23(6):666-670
[72]杨光信,史美林.全复制结构下基于对象数据模型的并发控制[J].计算机学报, 2003, 23(2):113-125
[73]王倩,金桦,吴立峰.混合结构的集成化协同设计环境[J].青岛科技大学学报(自然科学版), 2004, 25(6):530-534
[74] OpenCasCade[EB/OL],http://www.opencascade.org/
[75]陆薇. CAD支撑平台构件模型及流程控制机制的研究[M].北京:清华大学出版社,2001
[76]唐胜群,唐涛洲.软件体系结构与组件软件工程[J].计算机工程,1998,24(8):32-35
[77]王云鹏,雷毅,黄松波等.多层次开放式CAD开发平台技术[J].计算机工程,2004,30(1):42-44
[78]吴德华,毛先成,刘雨.三维空间数据模型综述[J].测绘工程,2005,14(3):70-78
[79]将玉明,薛晓滨,傅娟.实体造型中的几何模型与数据结构研究[J].中国机械工程,7(6):27-30
[80]李伟平,谷正气,张洪涛.支持产品协同设计的隐式特征表达[J].中国机械工程, 2006, 21(17):2233-2237
[81]傅由甲,杨克俭,王玉华.一种快速计算三维空间中物体碰撞接触面的方法[J].计算机仿真, 2005,22(1): 68-73
[82] Bergen GVD. Efficient collision detection of complex deformable models using AABB trees[J]. Journals of Graphics Tools(S1086-7651),1997,2(4):1-14
[83]傅由甲.动态八叉树在复杂场景设计中的应用[J].系统仿真学报, 2006,(S2)
[84] Amy L Williams,Steve Barrus,R Kerth Morley,Peter Shirly.An Efficient and Robust Ray-Box Intersection Algorithm[EB/OL].http://www.cs.utah.edu/~aw illiam/box, 2001
[85]董洪智,陈关龙,林忠钦等.数据交换标准在CAD/CAM系统中的应用研究[J].锻压机械,1998(5):56-60
[86] Xiao Rongqing, Hu Jun. A Primary Study about Data Exchange between Two CAD Software[J]. Engineering Journal of Wuhan University, 2003, 36(4):118-121
[87]杨洪君,宁汝新.Pro/E和UG之间三维模型数据交换方法[J].计算机辅助设计与图形学学报,2005,17 (12):2756-2759
[88]骆轶姝,秦鹏飞,何援军. CAD软件接口技术及实现[J].工程图学学报,2000,21(2):20-25
[89]邵晓东,陈锋,刘焕玲,徐晨光.基于特征的异构CAD模型转换技术研究[J].中国机械工程,2007,18(1):60-64
[90]任泰明.TCP/IP协议与网络编程[M].西安:西安电子科技大学出版社,2004,77-124
[91]崔彦峰,银华强.精通Visual Basic.net网络编程[M].北京:清华大学出版社,2004,99-134
[92]孙建华.网络互连技术教程[M].北京:人民邮电出版社,2005,23-56
[93] Williamson B. Developing IP Multicast Networks. Indianapolis[M].U SA :Cisco Press ,2000
[94]张容,苗放,李刚. XMPP及其在即时通信系统的文字通信模块中的应用[J].重庆工学院学报(自然科学),2008,22(2):92-95
[95] RFC3920[EB/OL],http://www.faqs.org/rfcs/rfc3920.html
[96]周祖德,盛步云.数字化协同与网络交互设计[M].北京:科学出版社,2005,95-96
[97]陆其明.DirectShow开发指南[M].北京:清华大学出版社,2003
[98]华峻,杨树堂,李建华.基于DirectShow技术视频流捕捉及压缩的实现方案[J].计算机工程, 2004, 30(12):143-146
[99]高文.多媒体数据压缩技术[M].北京:电子工业出版社,1999.
[100] MPEG/DivX技术[EB/OL].http://gb.doom9.org
[101] RFC3550, RTP: A transport protocol for real-time applications S1[D]. USA: Commbia University, 2003.
[102] CLINE S, DU J, KEANY B, et al. DirectShow RTP support for adaptively in networked multimedia applications[R]. International Conference on Multimedia Computing and System. Institute of Electric and Electronic Engineer. Multimedia Computing and Systems, 1998, 13-22.
[103] New Work Working Group. RFC3016: RTP payload format for MPEG-4 audio/visual streams[R]. Japan: Toshiba, 2000
[104]高玉金,石峰,张艳苏.MPEG-4分层视频的自适应传输构架[J].计算机应用,2003,23(12):3-6
[105]杨劲.网络流媒体传输中的自适应技术[J].中国有线电视,2003,13:23-25
[106]魏泽萍,王少梅,武一名.产品并行设计特征建模及应用[J].武汉交通科技大学学报, 1999, 3:246-249
[107]吴勇,周西军.基于特征的三维零件工程图表示[J].西北工业大学学报,1998,8:459-462
[108]殷国富,陈永华.计算机辅助设计技术与应用[M].科学出版社,2000
[109]童秉枢,李学志,吴志军等.机械CAD技术基础[M].北京:清华大学出版社,1996
[110]牛占文,张德全.CAD/CAM集成系统中面向对象产品定义模型[J].天津大学学报, 1996, 29(4):538-544
[111] Krause F L, Kimura F, Kjellberg T et al[J]. Annals of CIRP, 1993,42(2)
[112]蒲小琼.基于特征的产品集成建模技术研究[J].四川大学学报(自然科学报),1998,35(4)
[113] WD Li, SK Ong, JYH Fuh, YS Wong, YQ Lu, AYC Nee. Feature-based design in a distributed and collaborative environment[J]. Computer-Aided Design, 2004, 775-797
[114]奚妍,彭维,张三元,叶修梓.基于特征数据交换的异构CAD协同设计[J].农机化研究, 2006,12:188-191
[115]鲁泳,廖文和,黄翔等.异构CAD系统零件库几何信息交换的研究[J].机械科学与技术,2004,23 (10):1166-1168
[116]李伟平.异构环境下协同设计研究及其在汽车产品设计中的应用[D].湖南大学博士学位论文,2007
[117] Krause F L, Kramer S, Rieger E. PDGL-A Language for Efficient Feature Based Product Gestaltung[J]. An2nals of the CIRP, 1993, 40(1):135-138
[118] Chen XP, Hoffmann C M. On Editability of Feature- based Design[J]. Computer- aided Design, 1995, 27(12):905-914
[119]李伟平,谷正气,邓彪.支持协同CAD的拓扑实体永久命名机制[J].计算机应用, 2006, 26(12):3004-3007
[120]李伟平,谷正气,张洪涛.支持产品协同设计的隐式特征表达[J].中国机械工程, 2006,21(17):2233-2237
[121]彭维.网络化协同CAD系统的关键技术研究[D].西北工业大学博士学位论文,2001
[122] Hoffman C.M, joan-Arinyo R. CAD and the Product Master Model[J]. Computer-Aided Design, 1998, 30(11):905-918.
[123]高玉琴,何云峰,于俊清.改进的基于AABB包围盒的碰撞检测算法[J].计算机工程与设计,2007,28(16):3815-3817
[124]王立文,刘璧瑶,韩俊伟.一种改进AABB包围盒的碰撞检测算法[J].计算机工程与应用,2007,43(33):234-236
[125]高军峰,徐凯声,崔劲.一个基于包围盒技术提高光线与物体求交效率的算法[J].交通与计算机,2004,22(6):65-67
[126]王晓荣.基于AABB包围盒的碰撞检测算法的研究[D].华中师范大学硕士学位论文,2007
[127]李伟平.异构环境下协同设计研究及其在汽车产品设计中的应用[D].博士学位论文,2007
[128]杨武勇.史美林一种集成组播代理和操作转换的并发控制方法[J].软件学报, 2004, 15 (04): 497-503.
[129] Ricart, G. and A.K.Agrawala. An optimal algorithm for mutual exclusion in computer networks[J]. Communications of the ACM,1981,9-17
[130]邓集波,洪帆.基于任务的访问控制模型[J].软件学报,2003,14(1):76-82
[131]钟华,冯玉琳.扩充角色层次关系模型及其应用[J].软件学报,2000,11(6):779-781
[132] Barka E, Sandhu R. Framework for role-based delegation models[R]. In: Proc. of the 16th Annual Computer Security Application Conf. IEEE Computer Society Press, 2000,168-176
[133] Barka E, Sandhu R. A role-based delegation model and some extensions[R]. In: Proc. of the 23rd National Information Systems Security Conf. (NISSC 2000), 2000
[134] Zhang LH, Ahn G-J, Chu B-T. A rule-based framework for role-based delegation[R]. In: Sandhu RS, Jaeger T, eds. Proc. of the 6th ACM Symp. on Access Control Models and Technologies. New York: ACM Press, 2001, 153-162
[135] Zhang XW, Oh S, Sandhu RS. PBDM: A flexible delegation model in RBAC[R]. In: Ferrari E, Ferraiolo D, eds. Proc. of the 8th ACM Symp on Access Control Models and Technologies, New York: ACM Press, 2003, 149-157
[136] Bandmann O, Dam M, Firozabadi BS. Constrained delegation[R]. In: Proc of the 23rd Annual IEEE Symp on Security and Privacy, IEEE Computer Society Press, 2002, 131-143
[137] Wainer J , Kumar A. A fine-grained controllable user-touser delegation method in RBAC[R]. In: Proceedings of the 10th ACM Symposium on Access Control Models and Technologies, 2005, 59-66
[138]徐震,李斓,冯登国.基于角色的受限委托模型[J].软件学报,2005,16(5):970-978
[139]赵庆松,孙玉芳,孙波.RPRDM:基于重复和部分角色的转授权模型[J].计算机研究与发展, 2003,40(2):221-227
[140] BERTINO E, BONATTI P A, FERRARI E. TRBAC: a temporal role-based access control model[J]. ACM Transactions on Information and System Security, 2001, 4(3):191-233
[141] JOSHI J B D, BERTINO E, LATIF U, et al. A generalized temporal role-based access control model[J]. IEEE Transactions on Knowledge and Data Engineering, 2005, 17(1):4-23
[142]刘伟,蔡嘉勇,贺也平.协同环境下基于角色的细粒度委托限制框架[J].通信学报, 2008, 29(1): 83-91
[143]叶春晓,吴中福,符云清等.基于属性的扩展委托模型[J].计算机研究与展, 2006, 43(6): 1050-1057
[144]廖俊国,洪帆,朱更明等.基于信任度的授权委托模型[J].计算机学报,2006,29(8):1265-1270
[145]于继万,朱华飞.一种在网格中信任评估机制[J].计算机应用与软件,2005,22(6):67-70
[146] Werner Geyer, J.Vogel, Martin Mauve. An Efficient and Flexible Late Join Algorithm for Interactive Shared Whiteboards[R]. In: Proceedings of Fifth IEEE International Symposium on Computers and Communications(ISCC’2000), 2000,4-7
[147] Mihail Ionescu, Ivan Marsic. Latecomer and Crash Recovery Support in Fault-tolerant Groupware[J]. IEEE Distributed Systems, 2001, 2(7):1-14
[148] T.Fuhrmann, J.Widmer. On the Scaling of Feedback Algorithms for Very Large Multicast Group[C]. Special Issue of Computer Communication on Integrating Multicast into the Internet, 2001, 24(5-6):539-547
[149] J?rg Nonnenmacher, Ernst W. Biersack, Scalable feedback for large groups[C]. IEEE/ACM Transactions on Networking (TON), 1999, 7(3): 375-386.
[150] Jürgen Vogel , Martin Mauve , Werner Geyer , Volker Hilt , Christoph Kuhmünch,. A generic late-join service for distributed interactive media[R]. Proceedings of the eighth ACM international conference on Multimedia, 2000, 259-267
[151]王钰,杨国为.一种含设计意图的3D模型数据实时交换格式[J].计算机辅助设计与图形学学报,2007,19(11):1429-1435
[152]李磊,张申生,张敬谊等.协同设计过程中迟到者加入算法研究[J].计算机集成制造系统, 2005, 11(2): 233-236
[153] Stephan Lukosch. Transparent Latecomer Support for Synchronous Groupware[R]. In: Proceedings of 9th International Workshopon Groupware, 2003, 26-41
[154] J.Vogel, M.Mauve, V.Hilt, W.Effelsberg. Late Join Algorithms for Distributed Interactive Applications[J]. ACM/Springer Multimedia Systems, 2003, 9(4):327-336
[155]吴鹏.实时协同设计系统中同步过程的研究[J].计算机工程与设计,2007,28(2):297-299
[2] Cutkosky M R, Engelmore R S, Fikes R et al. PACT: An Experiment in Integrating Concurrent Engineering Systems[J]. IEEE Computer, 1993,26(1):28-37
[3]郭凯.基于异构CAD平台的协同设计系统研究[D].沈阳工业大学硕士论文,2007
[4] Ahn S H, Sundararajan V, Smith C E, Kannan B B, Souza R D, Sun G, Mohole A, Wright P K, Kim J, McMains S, Smith J, Sequin C H. CyberCut: an internet-based CAD/CAM system[J].Joumal of Computing and Information Science in Engineering, 2001, 1(1): 52-59
[5] Kim C Y, Kim N, Kim Y, Kang SH, Grady P O. Internet-based Concurrent Engineering: An Interactive 3D System with Markup[R]. In: CD-ROM Proceedings of the 1998 ASME Computers in Engineering Conference, Atlanta, 1998
[6] Lee J Y, Kim H, Han S B, Park S B. Network-Centric Feature-Based Modeling[J].Proceedings of Pacific Graphics '99, Kim, M.-S. and Seidel, H.-P(Eds.), IEEE Computer Society, CA, 1999,280-289
[7] Bidarra R, van den Berg E, Bronsvoort W F. Cottaborative modeling with features[R].In: CD-ROM Proceedings of 2001 ASME Design Engineering Technical Conferences,Pittsburgh, Pennsylvania,2001
[8] Dietrich U, Von Lukas U, Morche I. Cooperative modeling with TOBACO[J].Proceedings of the TeamCAD97 Workshop on Collaborative Design,1997, (5):115-122
[9] Chan S, Wong M, Ng V. Collaborative Solid Modeling on the WWW[J]. Proceeding s of the 1999 ACM Symposium on Applied Computing, 1999, (3):3598-602
[10]何发智,高曙明,王少梅,孙国正.基于CSCW的CAD系统协作支持技术与支持工具的研究[J].计算机辅助设计与图形学学报,2002 14(2): 163-167
[11]何发智,王少梅,孙国正,高曙明.协同集成设计环境的计算机辅助工具[J].机械工程学报, 2002, 38(6): 16-20
[12]谢洪潮,陈大融,孔宪梅.分布式模块化协同设计方法[J].机械设计,2002, 5 (5):7-11
[13]张友良,汪惠芬.异地协同设计制造关键技术及系统实现[J].工程设计,2002, 9 (2):53-59
[14]孔振宇,于华,刘晋春.敏捷制造环境下的线切割CAD/CAM系统[J].中国机械工程,1998, 9 (6): 32-35
[15]姜波,卜佳俊.基于Internet的图案协同设计中迟加入问题的研究[J].计算机工程,2003,28(4): 88-89
[16]方萃浩,叶修梓,彭维等.协同环境下CAD模型的多层次动态安全访问控制[J].软件学报,2007,18(9):2295-2304
[17]方萃浩,彭维,叶梓修.以网络为中心的几何造型技术[J].计算机辅助设计与图形学学报,2005,17(5):879-888
[18]高曙明,何发智.分布式协同设计技术综述[J].计算机辅助设计与图形学报, 2004, 16(2): 149-157
[19] Wu D, BhargavaS, Sarma R. Solid Model Streaming as a Basis for a Distributed Design Environment[R]. In: Proceedings of ASME Design Engineering Technical Conferences, Baltimore, Maryland,2000
[20] Agrawal A K, Ramani K, Hoffmann C M. CADDAC: Multi-Client collaborative Shape Design System With Server-Based Geometry Kernel[J]. Journal of Computing and Information Science in Engineering, 2003, 3(2):170-174
[21]周勋,李洁等.基于Internet的协同实体建模系统的设计与实现[C].第12届全国计算机辅助设计与图形学学术会议论文集,贵阳,2002,720-725
[22]鲁泳,廖文和,黄翔等.异构CAD系统零件库几何信息交换的研究[J].机械科学与技术, 2004, 23 (10) :1166-1168
[23]张必强,邢渊,阮雪榆.分布式同步协同设计中基于三角网格模型的实时传输[J].中国机械工程, 2003, 13(4):305-308
[24]刘云华,陈立平,钟毅.利用设计历史实现异构CAD系统特征信息交换[J].中国机械工程, 2003,14 (21):1845-1847
[25]汪慧芬,张友良,曹健.基于特征的协同设计[J].计算机辅助设计与图形学报,2001,13(4):367
[26] Ellis C A, Gibbs S J. Concurrency Control in Groupware Systems[R]. Proceedings of 1989 ACM SIGMOD International Conference on the Management of Data, Portland, Oregon. 1989: 387-423.
[27] Ellis C A, Rein G L. Groupware Some Issues and Experiences[J]. Communications of the ACM, 1991, 31(1): 32-68.
[28] Liu F, Luh P, Moser B. Scheduling and Coordination of Distributed Design Projects[J]. Annals of CIRP, 1998, 47(1): 111-114.
[29] Brayner A, Harder T, Ritter N. Semantic Serializability: A Correctness Criterion for Processing Transactions in Advanced Database Applications[J]. Data & Knowledge Engineering, 1999, 31(1).
[30]赵蓉,史维峰,郑超.协同CAD系统中的并发控制机制[J].计算机工程,2007,33(18):106-108
[31] Greenberg S, Marwood D. Real-time groupware as a distributed system: Concurrency control and its effect on the interface[R]. In:Proceedings of ACM Conference on Computer SupportedCooperative Work, Chapel H ill, 1994, 207- 217
[32] W. D. Li, S. K. Ong, J. Y. H. Fuh, Y. S. Wong, Y. Q. Lu and A. Y. C. Nee.Feature-based design in a distributed and collaborative environment[J]. CAD Computer Aided Design,2004, 36(9):775-797
[33] J. Y. Chen, Y. S. Ma, C. L. Wang and C. K. Au. Collaborative design environment with multiple CAD systems[J]. Computer-Aided Design and Applications, 2005, 2(1-4), 367-376.
[34] M. Li, S. M. Gao and C. C. L. Wang. Real-time collaborative design with heterogeneous CAD systems based on neutral modeling commands[J]. Journal of Computing and Information Science in Engineering, 2007, 7(2):113–125
[35] Suleiman M, Cart M, Ferrie J. Serialization of concurrent operations in a distributed collaborative environment[J]. In:Proceedings of ACM SIGGROUP Conference on Supporting GroupWare, Phoenix, 1997,435- 445
[36] Ressel M, NitscheRuhland D, Gunzenhauser R. An integrating transformation oriented approach to concurrency control and undo in group editor[R]. In: Proceedings of ACM Conference on Computer Supported Cooperative Work, Cam b ridge, 1996,288- 297
[37] Sun CZ, Ellis C. Operational transformation in real-time group editors: Issues, algorithms, and achievements[R].In: Poltrock S, ed. Proc. of the ACM Conf. on Computer Supported Cooperative Work. Seattle: ACM Press, 1998,59-68
[38] Sun CZ, Jia XH, Zhang YC, Yang Y. A generic operation transformation scheme for consistency maintenance in real-time cooperative editing systems[R]. In: Stephen C, ed. Proc. of the ACM SIGGROUP Conf. on Supporting Group Work. Phoenix: ACM Press, 1997,425-434
[39]杨光信,美林全.制结构下基于对象数据模型的并发控制[J].计算机学报,2000,23(2):113-125
[40] Nam TJ [1998]:“An Investigation of Multi-user Design Tools for Collaborative 3D Modelling[R]. Conference on Computer Supported Cooperative Work,Doctoral Colloquium,November 1998,Seattle.
[41] Nam T,Wright D. The Development and Evaluation of Syco3D:A Real-Time Collaborative 3D CAD System[J]. Design Studies,2001,22:557-582
[42] Dietrieh U,Von Lukas U,Morche I. Cooperative modeling with TOBACO[R]. Proceedings of the TeamCAD97 Workshop on Collaborative Design,Atlanta,1997,115-122
[43] T. J. Nam and D. Wright. The development and evaluation of Syco3D:a real-time collaborative 3D CAD system[J]. Design Studies, 2001, 22(6), 557–582
[44] M. Tang, S.C. Chou, J.X. Dong. Collaborative virtual environment for feature based modeling[R]. in: Proceedings of 2004 International Conference on Virtual Reality Continuumand its Applications in Industry, Singapore, 2004, 120–126
[45] X. Zhou, J. Li, F. Z. He and S. M. Gao. A web-based synchronized collaborative solid modeling system[J]. Chinese Journal of Computer Integrated Manufacturing Systems, 2003, 9(11): 960–965
[46] E. Chan and K. M. Yu. A concurrency control model for PDM systems[J]. Computers in Industry, 2007, 58(8-9): 823–831
[47] Anderson J P. Computer security technology planning study[R]. Air Force Electronic System Division, Hanscom AFB, Bedford, MA: Technical Report ESDTR-73-51, 1972
[48] Bell DE, Lapadula LJ. Secure Computer Systems: Mathematical Foundations[C]. Vol. 1. Bedford: The Mitre Corporation, 1973
[49] Harrison MA, Ruzzo WL, Ullman JD. Protection in operating systems[J]. Communications of ACM, 1976, 19(8):461-471
[50] Department of Defense. Trusted computer system evaluation criteria (TESEC) [R]. Technical Report, DOD 5200.28-STD, 1985
[51] Ferraiolo D, Kuhn DR. Role-Based access control[R]. In: Proc. of the 15th National Computer Security Conf, 1992, 554-563
[52] Sandhu R, Coyne EJ, Feinstein HL, Youman CE. Role-Based access control models[J]. IEEE Computer, 1996, 29(2):38-47
[53] Sandhu R, Bhamidipati V, Munawer Q. The ARBAC97 model for role-based administration of roles[J]. ACM Trans. on Information and System Security (TISSEC), 1999, 2(1):105-135
[54] Sandhu R, Munawer Q. The ARBAC99 model for administration of roles[J]. In: Proc. of the 15th Annual Computer Security Applications Conf. Washington: IEEE Computer Society, 1999, 229-238
[55] Ferraiolo DF, Sandhu R, Gavrila S.Proposed NIST standard for role-based access control[J]. ACM Trans. on Information and Systems Security (TISSEC), 2001, 4(3):224-274
[56] Thomas RK, Sandhu RS. Task-Based authentication control (TBAC): A family of models for active an enterprise-oriented authentication management[R]. In: Proc. of the 11th IFIP Conf. on Database Security,1997, 11-13
[57] Oh S, Park S. Task-Role-Based access control model[J]. Information System, 2003, 28(6): 533-562.
[58] Park J, Sandhu R. Towards usage control models: Beyond traditional access control[R]. In: Proc. of the 7th ACM Symp. on Access Control Models and Technologies,2002,57-64
[59] Park J, Sandhu R. The UCONABC usage control model[J]. ACM Trans. on Information and System Security, 2004, 7(1):128-174
[60] Sandhu R, Park J. Usage control: A vision for next generation access control[R]. In Proc. of the 2nd Int’l Workshop on Mathematical Methods, Models and Architectures for Computer Networks Security. LNCS 2776, 2003, 17-31
[61] Lampson BW. Protection[J]. Operating System Rev., 1974, 8(1):18-24
[62] Shen HH, Dewan P. Access control for collaborative environments[R]. In: Proc. of the 1992 ACM Conf. on Computer-Supported Cooperative Work. New York: ACM Press,1992,51-58
[63] Bullock A, Benford S.An access control framework for multi-user collaborative environments[R]. In: Proc. of the Int'l ACM SIGGROUP Conf. on Supporting Group Work (GROUP '99).New York: ACM Press, 1999, 140-149.
[64] Shyamsundar N, Gadh R. Internet-Based collaborative product design with assembly features and virtual design spaces[J]. Computer-Aided Design, 2001, 33(9):637-651
[65] van der Hoeven A, ten Bosch O, van Leuken R, van der Wolf P. A flexible access control mechanism for CAD frameworks[R]. In: Proc. of the Conf. on European Design Automation. Los Alamitos: IEEE Computer Society Press, 1994, 188-193
[66] Cera CD, Kim T, Han JH, Regli WC. Role-Based viewing envelopes for information protection in collaborative modeling[J]. Computer-Aided Design, 2004, 36(9):873-886
[67] S. Floyd, V. Jacobson, C. Liu, S. McCanne ,L. Zhang. A reliable multicast framework for leight-weight sessions and application level framing[J]. In: IEEE/ACM Transactions on Networking, 1997, 5(6):784-803
[68] J. F. Patterson, M. Day and J. Kucan, Notification servers for synchronous groupware[R]. In: Proc. of the ACM conference on Computer supported cooperative work(CSCW),1996,122
[69] W. Geyer and W. Effelsberg. The Digital Lecture Board- A Teaching and Learning Tool for Remote Instruction in Higher Education[R]. In: Proc. of 10th World Conference on Educational Multimedia (ED-MEDIA)’98, 1998
[70] M. Handley, and J. Crowcroft. Network text editor(NTE): A scalable shared text editor for the MBone[R]. In: Proc. of the ACM SIGCOMM’97, 1997, 197 - 208
[71]刘新福,王光彩,代雯君,顾君忠.集中式CSCW环境中对实时共享对象的并发控制算法[J].小型微型计算机系统, 2002, 23(6):666-670
[72]杨光信,史美林.全复制结构下基于对象数据模型的并发控制[J].计算机学报, 2003, 23(2):113-125
[73]王倩,金桦,吴立峰.混合结构的集成化协同设计环境[J].青岛科技大学学报(自然科学版), 2004, 25(6):530-534
[74] OpenCasCade[EB/OL],http://www.opencascade.org/
[75]陆薇. CAD支撑平台构件模型及流程控制机制的研究[M].北京:清华大学出版社,2001
[76]唐胜群,唐涛洲.软件体系结构与组件软件工程[J].计算机工程,1998,24(8):32-35
[77]王云鹏,雷毅,黄松波等.多层次开放式CAD开发平台技术[J].计算机工程,2004,30(1):42-44
[78]吴德华,毛先成,刘雨.三维空间数据模型综述[J].测绘工程,2005,14(3):70-78
[79]将玉明,薛晓滨,傅娟.实体造型中的几何模型与数据结构研究[J].中国机械工程,7(6):27-30
[80]李伟平,谷正气,张洪涛.支持产品协同设计的隐式特征表达[J].中国机械工程, 2006, 21(17):2233-2237
[81]傅由甲,杨克俭,王玉华.一种快速计算三维空间中物体碰撞接触面的方法[J].计算机仿真, 2005,22(1): 68-73
[82] Bergen GVD. Efficient collision detection of complex deformable models using AABB trees[J]. Journals of Graphics Tools(S1086-7651),1997,2(4):1-14
[83]傅由甲.动态八叉树在复杂场景设计中的应用[J].系统仿真学报, 2006,(S2)
[84] Amy L Williams,Steve Barrus,R Kerth Morley,Peter Shirly.An Efficient and Robust Ray-Box Intersection Algorithm[EB/OL].http://www.cs.utah.edu/~aw illiam/box, 2001
[85]董洪智,陈关龙,林忠钦等.数据交换标准在CAD/CAM系统中的应用研究[J].锻压机械,1998(5):56-60
[86] Xiao Rongqing, Hu Jun. A Primary Study about Data Exchange between Two CAD Software[J]. Engineering Journal of Wuhan University, 2003, 36(4):118-121
[87]杨洪君,宁汝新.Pro/E和UG之间三维模型数据交换方法[J].计算机辅助设计与图形学学报,2005,17 (12):2756-2759
[88]骆轶姝,秦鹏飞,何援军. CAD软件接口技术及实现[J].工程图学学报,2000,21(2):20-25
[89]邵晓东,陈锋,刘焕玲,徐晨光.基于特征的异构CAD模型转换技术研究[J].中国机械工程,2007,18(1):60-64
[90]任泰明.TCP/IP协议与网络编程[M].西安:西安电子科技大学出版社,2004,77-124
[91]崔彦峰,银华强.精通Visual Basic.net网络编程[M].北京:清华大学出版社,2004,99-134
[92]孙建华.网络互连技术教程[M].北京:人民邮电出版社,2005,23-56
[93] Williamson B. Developing IP Multicast Networks. Indianapolis[M].U SA :Cisco Press ,2000
[94]张容,苗放,李刚. XMPP及其在即时通信系统的文字通信模块中的应用[J].重庆工学院学报(自然科学),2008,22(2):92-95
[95] RFC3920[EB/OL],http://www.faqs.org/rfcs/rfc3920.html
[96]周祖德,盛步云.数字化协同与网络交互设计[M].北京:科学出版社,2005,95-96
[97]陆其明.DirectShow开发指南[M].北京:清华大学出版社,2003
[98]华峻,杨树堂,李建华.基于DirectShow技术视频流捕捉及压缩的实现方案[J].计算机工程, 2004, 30(12):143-146
[99]高文.多媒体数据压缩技术[M].北京:电子工业出版社,1999.
[100] MPEG/DivX技术[EB/OL].http://gb.doom9.org
[101] RFC3550, RTP: A transport protocol for real-time applications S1[D]. USA: Commbia University, 2003.
[102] CLINE S, DU J, KEANY B, et al. DirectShow RTP support for adaptively in networked multimedia applications[R]. International Conference on Multimedia Computing and System. Institute of Electric and Electronic Engineer. Multimedia Computing and Systems, 1998, 13-22.
[103] New Work Working Group. RFC3016: RTP payload format for MPEG-4 audio/visual streams[R]. Japan: Toshiba, 2000
[104]高玉金,石峰,张艳苏.MPEG-4分层视频的自适应传输构架[J].计算机应用,2003,23(12):3-6
[105]杨劲.网络流媒体传输中的自适应技术[J].中国有线电视,2003,13:23-25
[106]魏泽萍,王少梅,武一名.产品并行设计特征建模及应用[J].武汉交通科技大学学报, 1999, 3:246-249
[107]吴勇,周西军.基于特征的三维零件工程图表示[J].西北工业大学学报,1998,8:459-462
[108]殷国富,陈永华.计算机辅助设计技术与应用[M].科学出版社,2000
[109]童秉枢,李学志,吴志军等.机械CAD技术基础[M].北京:清华大学出版社,1996
[110]牛占文,张德全.CAD/CAM集成系统中面向对象产品定义模型[J].天津大学学报, 1996, 29(4):538-544
[111] Krause F L, Kimura F, Kjellberg T et al[J]. Annals of CIRP, 1993,42(2)
[112]蒲小琼.基于特征的产品集成建模技术研究[J].四川大学学报(自然科学报),1998,35(4)
[113] WD Li, SK Ong, JYH Fuh, YS Wong, YQ Lu, AYC Nee. Feature-based design in a distributed and collaborative environment[J]. Computer-Aided Design, 2004, 775-797
[114]奚妍,彭维,张三元,叶修梓.基于特征数据交换的异构CAD协同设计[J].农机化研究, 2006,12:188-191
[115]鲁泳,廖文和,黄翔等.异构CAD系统零件库几何信息交换的研究[J].机械科学与技术,2004,23 (10):1166-1168
[116]李伟平.异构环境下协同设计研究及其在汽车产品设计中的应用[D].湖南大学博士学位论文,2007
[117] Krause F L, Kramer S, Rieger E. PDGL-A Language for Efficient Feature Based Product Gestaltung[J]. An2nals of the CIRP, 1993, 40(1):135-138
[118] Chen XP, Hoffmann C M. On Editability of Feature- based Design[J]. Computer- aided Design, 1995, 27(12):905-914
[119]李伟平,谷正气,邓彪.支持协同CAD的拓扑实体永久命名机制[J].计算机应用, 2006, 26(12):3004-3007
[120]李伟平,谷正气,张洪涛.支持产品协同设计的隐式特征表达[J].中国机械工程, 2006,21(17):2233-2237
[121]彭维.网络化协同CAD系统的关键技术研究[D].西北工业大学博士学位论文,2001
[122] Hoffman C.M, joan-Arinyo R. CAD and the Product Master Model[J]. Computer-Aided Design, 1998, 30(11):905-918.
[123]高玉琴,何云峰,于俊清.改进的基于AABB包围盒的碰撞检测算法[J].计算机工程与设计,2007,28(16):3815-3817
[124]王立文,刘璧瑶,韩俊伟.一种改进AABB包围盒的碰撞检测算法[J].计算机工程与应用,2007,43(33):234-236
[125]高军峰,徐凯声,崔劲.一个基于包围盒技术提高光线与物体求交效率的算法[J].交通与计算机,2004,22(6):65-67
[126]王晓荣.基于AABB包围盒的碰撞检测算法的研究[D].华中师范大学硕士学位论文,2007
[127]李伟平.异构环境下协同设计研究及其在汽车产品设计中的应用[D].博士学位论文,2007
[128]杨武勇.史美林一种集成组播代理和操作转换的并发控制方法[J].软件学报, 2004, 15 (04): 497-503.
[129] Ricart, G. and A.K.Agrawala. An optimal algorithm for mutual exclusion in computer networks[J]. Communications of the ACM,1981,9-17
[130]邓集波,洪帆.基于任务的访问控制模型[J].软件学报,2003,14(1):76-82
[131]钟华,冯玉琳.扩充角色层次关系模型及其应用[J].软件学报,2000,11(6):779-781
[132] Barka E, Sandhu R. Framework for role-based delegation models[R]. In: Proc. of the 16th Annual Computer Security Application Conf. IEEE Computer Society Press, 2000,168-176
[133] Barka E, Sandhu R. A role-based delegation model and some extensions[R]. In: Proc. of the 23rd National Information Systems Security Conf. (NISSC 2000), 2000
[134] Zhang LH, Ahn G-J, Chu B-T. A rule-based framework for role-based delegation[R]. In: Sandhu RS, Jaeger T, eds. Proc. of the 6th ACM Symp. on Access Control Models and Technologies. New York: ACM Press, 2001, 153-162
[135] Zhang XW, Oh S, Sandhu RS. PBDM: A flexible delegation model in RBAC[R]. In: Ferrari E, Ferraiolo D, eds. Proc. of the 8th ACM Symp on Access Control Models and Technologies, New York: ACM Press, 2003, 149-157
[136] Bandmann O, Dam M, Firozabadi BS. Constrained delegation[R]. In: Proc of the 23rd Annual IEEE Symp on Security and Privacy, IEEE Computer Society Press, 2002, 131-143
[137] Wainer J , Kumar A. A fine-grained controllable user-touser delegation method in RBAC[R]. In: Proceedings of the 10th ACM Symposium on Access Control Models and Technologies, 2005, 59-66
[138]徐震,李斓,冯登国.基于角色的受限委托模型[J].软件学报,2005,16(5):970-978
[139]赵庆松,孙玉芳,孙波.RPRDM:基于重复和部分角色的转授权模型[J].计算机研究与发展, 2003,40(2):221-227
[140] BERTINO E, BONATTI P A, FERRARI E. TRBAC: a temporal role-based access control model[J]. ACM Transactions on Information and System Security, 2001, 4(3):191-233
[141] JOSHI J B D, BERTINO E, LATIF U, et al. A generalized temporal role-based access control model[J]. IEEE Transactions on Knowledge and Data Engineering, 2005, 17(1):4-23
[142]刘伟,蔡嘉勇,贺也平.协同环境下基于角色的细粒度委托限制框架[J].通信学报, 2008, 29(1): 83-91
[143]叶春晓,吴中福,符云清等.基于属性的扩展委托模型[J].计算机研究与展, 2006, 43(6): 1050-1057
[144]廖俊国,洪帆,朱更明等.基于信任度的授权委托模型[J].计算机学报,2006,29(8):1265-1270
[145]于继万,朱华飞.一种在网格中信任评估机制[J].计算机应用与软件,2005,22(6):67-70
[146] Werner Geyer, J.Vogel, Martin Mauve. An Efficient and Flexible Late Join Algorithm for Interactive Shared Whiteboards[R]. In: Proceedings of Fifth IEEE International Symposium on Computers and Communications(ISCC’2000), 2000,4-7
[147] Mihail Ionescu, Ivan Marsic. Latecomer and Crash Recovery Support in Fault-tolerant Groupware[J]. IEEE Distributed Systems, 2001, 2(7):1-14
[148] T.Fuhrmann, J.Widmer. On the Scaling of Feedback Algorithms for Very Large Multicast Group[C]. Special Issue of Computer Communication on Integrating Multicast into the Internet, 2001, 24(5-6):539-547
[149] J?rg Nonnenmacher, Ernst W. Biersack, Scalable feedback for large groups[C]. IEEE/ACM Transactions on Networking (TON), 1999, 7(3): 375-386.
[150] Jürgen Vogel , Martin Mauve , Werner Geyer , Volker Hilt , Christoph Kuhmünch,. A generic late-join service for distributed interactive media[R]. Proceedings of the eighth ACM international conference on Multimedia, 2000, 259-267
[151]王钰,杨国为.一种含设计意图的3D模型数据实时交换格式[J].计算机辅助设计与图形学学报,2007,19(11):1429-1435
[152]李磊,张申生,张敬谊等.协同设计过程中迟到者加入算法研究[J].计算机集成制造系统, 2005, 11(2): 233-236
[153] Stephan Lukosch. Transparent Latecomer Support for Synchronous Groupware[R]. In: Proceedings of 9th International Workshopon Groupware, 2003, 26-41
[154] J.Vogel, M.Mauve, V.Hilt, W.Effelsberg. Late Join Algorithms for Distributed Interactive Applications[J]. ACM/Springer Multimedia Systems, 2003, 9(4):327-336
[155]吴鹏.实时协同设计系统中同步过程的研究[J].计算机工程与设计,2007,28(2):297-299
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