A method of determining optimal air conditioner control is provided that includes determining power consumptions of servers and computer room air conditioners, calculating a number of calories processed by each air conditioner and determining a total number of calories processed as a total heat processed load. In particular, this disclosure proposes techniques that may lower the number contexts used in CABAC by up to 56. Respective ends of the first conductive layers are formed in a stepwise manner in relation to each other in a first direction. The control signal generating circuit sequentially outputs first and second refresh start signals within an operation time to an external refresh command in response to an internal refresh command. As a result, in the evaporated fuel treatment device of the invention, the amount of the evaporated fuel which can be desorbed from the canister is larger than that of a conventional device. Particular embodiments of the inventive technology relate to \u2018axially spaced illumination\u2019 technology featuring more than one cell illumination site, where, other than the most upflow illumination site, all illumination site are downflow of at least one other illumination site.