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Knowledge sharing in virtual organization requires decentralized knowledge management. In this paper, a personal knowledge sharing ontology model based on user preferences and P2P network is proposed to implement a virtual organization. Based on the model, the algorithms of query message routing and personal knowledge updating are created by using the so called small world theory. It is shown, through experimental evaluation, that the model and its algorithm can efficiently support the searching and updating personal knowledge functionalities in the P2P network.
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