同步教学中电子白板的研究与设计

The research and design of whiteboard in network education

设计的电子白板模型结合了集中式C/S模式和组播通信的特点 ,使电子白板能方便的管理交互中的白板信息 ,并且尽可能减少通信开销。在模型设计中 ,为了保证信息的可靠传输 ,我们采用了RAMP实现可靠组播 ,能够通过设置相应的参数与多种可靠组播协议交互操作 。

A whiteboard model is provided in this paper. It combines the characteristics of central mode of client/server and distributed mode of multicast, and makes it easy to manage the information of whiteboard, and reduces the expenditure of communication. To insure the reliable transmission of the information, we adapt the mechanism of RMF (Reliable Multicast Framwork) , by which a “Universal Receiver” can interoperate with any RMF sender regardless of the multicast semantics by setting the various fields in data packets and session-level state information appropriately.