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中文摘要：
针对协同设计中数据重大、事务长、多层嵌套的特点，建立了一种实时协同设计并发控制模型，采用基于语义事务的并发控制策略，提出了囤档数据库存储结构，建立了事务结构、事务提交、锁机制和冲突协调多方面的协同联系。实例证明，并发控制策略不仅让协同用户自由地操作共享资源，还能够保证数据的实时一致性。
英文摘要：
Collaborative design is characterized by large volumes of data, long-term transaction processes and nested layers. Therefore a concurrency control model for real-time collaborative design is established. A new concurrency control strategy based on semantic meanings and memory structures of drawings are adopted. The relationships among transaction structures, transaction submission, inter-lock mechanisms and conflict harmonization are established. Instances prove that the concurrency control strategy not only enables its collaborative users to handle shared resources freely but also guarantees the consistency of real-time data.
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