發送短信 : A mathematical model used in flow lines for performance measurement and system improvement

 _    _      ___      _____      ___      ______  
| \  / ||   / _ \\   |__  //    / _ \\   /_____// 
|  \/  ||  | / \ ||    / //    / //\ \\  `____ `  
| .  . ||  | \_/ ||   / //__  |  ___  || /___//   
|_|\/|_||   \___//   /_____|| |_||  |_|| `__ `    
`-`  `-`    `---`    `-----`  `-`   `-`  /_//     
                                         `-`