摘要： 为了有效地描述移动计算环境下P2P 的动态资源情形，提出了一种面向P2P 的动态资源模型——PODRM 模型。该模型首先根据P2P 模式下的资源特性构造出P2P 的网络资源空间，并抽取角色约束及操作约束，从而实现对P2P 资源的静态描述。然后，对CPN 进行了资源语义扩充，采用扩充了的CPN——E-CPN 来刻画资源的动态特性。进而在此基础上构造了PODRM 模型。最后给出了该模型的仿真验证。结果表明，该模型能够合理地描述了移动计算环境下P2P 的动态资源情形，为动态资源的有效使用及受限资源问题的解决提供了一种有力的理论依据。

关键词: 移动计算；动态资源；P2P；CPN

Abstract: In order to describe effectively resource of P2P pattern in mobile computing, a novel model, P2P-oriented dynamic resource model (PODRM), is proposed. Firstly, the resource space of P2P network is constructed based on the resource characteristic. And, the role-restriction and operation-restriction is abstracted from actual resource use situation. Thus, the static description for resource is implemented. After that, the CPN is extended by adding resource semantic, and the extended CPN (E-CPN) is used to depict the dynamic characteristic of resource. The PODRM model is built based on them. At last, the model is simulated and validated. The result indicates that the model can describe the resource of mobile P2P network well. It provides a strong warranty in theory for efficiency using resource and solving the issue of resource limited.

Key words: Mobile computing; Dynamic resource; P2P; CPN