       
 

   2015-05-22                

           
                     
      
)                           
               
r             
                          
           
                             
     
                  16 32 63 128 256 512 1024                 i           
     
                               
     
                                                                                       
 
                                         
  
       
2015      
       
        
           
    
            
       16       
        
           
         
                               
               