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Cloud computing has been brought to the classroom in some place. This paper first analyzes possible application modes for CES(cloud educational system):Centralized, Distributed and Hybrid, then proposes general architecture for CES. At last, various challenges and viable solutions are discussed.
P2P networks were new stars of 21 century and they were widely used in nowadays networks. It was very important to study the frangibility of P2P networks and know the characteristics when nodes invalidated or suffered intentionally attacked which would be good used in future. This paper analyzed the frangibility of Gnutella works, including suffered random failure, degree attack and betweenness attack...
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