Oxygen is doped in a quantum well active layer. The first and second isolation regions are arranged between the adjacent charge accumulation regions. The configuration device then causes the application to instantiate the desired number of instances with the desired configurations by replacing an existing configuration file of the programmable process controller with the new configuration file. When a downhole tool is inserted into the wellbore, the lubricator head rests against the lubricator base to provide a low, safe and stable position for operation of the equipment mounted to the top of the lubricator head. The operating OS software is recognized according to the save information, and the OS software state information generated for the recognized OS software during active replacement is restored. Thereafter, the image adding apparatus produces image data to which an index value of the non-extended portion is set when a bit value embedded into a pixel is equal to \u201c0\u201d, and also to which an index value of the extended portion is set when a bit value is equal to \u201c1.