發送短信

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 ______      ___     _    _    _    _             
|      \\   / _ \\  | |  | || | || | ||     ___   
|  --  //  / //\ \\ | |/\| || | || | ||    /   || 
|  --  \\ |  ___  |||  /\  || | \\_/ ||   | [] || 
|______// |_||  |_|||_// \_||  \____//     \__ || 
`------`  `-`   `-` `-`   `-`   `---`       -|_|| 
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發送短信 : A hierarchical framework of dynamic relay selection for mobile users and profit maximization for service providers in wireless relay networks