發送短信 : Economic design of exponential chart for monitoring time-between-event data under random process shift

 _    _    __   __    _____     ______   ______   
| |  | ||  \ \\/ //  |__  //   /_   _// |      \\ 
| |/\| ||   \ ` //     / //     -| ||-  |  --  // 
|  /\  ||    | ||     / //__    _| ||_  |  --  \\ 
|_// \_||    |_||    /_____||  /_____// |______// 
`-`   `-`    `-`'    `-----`   `-----`  `------`