An organic EL device which comprises an anode, a cathode and one or more than one organic thin-film layer including a light-emitting layer contains a specific diaryl compound, triaryl compound or tetraaryl compound represented by following formula, or : . A higher sampling rate at the ADC increases instantaneous bandwidth, while a higher sampling rate at the DAC improves spectral purity. Insufflation gas is delivered to the distal gas ports and withdrawn from the proximal gas ports or vice versa such that a gas bubble is formed in the body cavity and travels with the distal tip of the endoscope. The method allows, therefore, the enhancement of fuel economy, in combination with the suppression of oxidation of the lubricating oil itself. The communication unit wirelessly communicates with another base station by using a subframe between the boundary before movement by the scheduler and the boundary after the movement. If the first length of time required is less than the predetermined amount of time, the download begins.