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. 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。
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. 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。