發送短信 : A Mathematical Approach to Derive the Optimal Ordering Policy with Backorders and Inspection

 _    _     _____              _    _    _____    
| |  | ||  |  ___||     ___   | || | || |  __ \\  
| |/\| ||  | ||__      /   || | || | || | |  \ || 
|  /\  ||  | ||__     | [] || | \\_/ || | |__/ || 
|_// \_||  |_____||    \__ ||  \____//  |_____//  
`-`   `-`  `-----`      -|_||   `---`    -----`   
                         `-`