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It is a crucial problem in the studies of the fluid on numerical simulations of the interfaces movement in multi-component fluids. Fluid dynamic characteristics are studied during shock waves pass helium bubble in this paper. These methods are used including high resolution discontinuous finite method for Fluid dynamic equations, Level set method for capturing moving interfaces and ghost fluid method...
In view of the fact that group call communication mode is needed by the government, enterprises, police and other group. Push-to-talk over Cellular (PoC) service based on TD-SCDMA network is designed in the paper. At first, a new network structure and function entities about PoC service are introduced. Then the channel distribution mechanism is described. At the same time, the communication capacity...
Aiming at wide variations in loads and moment of inertia, large disturbed moment of a rocket launcher position servo system, a backstepping and sliding mode cascaded compound control method was present. The sliding mode variable structure controller of velocity loop and the backstepping controller of position loop were designed. The sliding mode control can restrain effects of parameter uncertainties...
To provide secure communication for universal mobile telecommunications system (UMTS) Mobile Networks, authentication and key agreement (AKA) is carried out between the user and the home environment, and the authentication protocol is an important primitive for entity authentication and session keys. The current authentication protocol is giving a reasonable security level. However it is overloading...
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