A method for establishing a multi-carrier HSDPA channel and method for transmitting multi-carrier downlink packet data are provided. The preferred embodiment of the present invention uses provides a double gated transistor with asymmetric gate doping, where one of the double gates is doped degenerately n-type and the other degenerately p-type. A portion of the virtual mask that is in the direction that the viewer is facing is displayed over the real-world image with the variation in the virtual mask providing information to the viewer about the direction of the target item. The laser pulse durations are varied, short laser pulse durations being utilized only in the area to be removed in which an influence on the penetration behavior and discharge behavior is noticeable while longer pulse durations of >0. The sheath includes a resin including nickel hydroxide at a mixing mass ratio of not less than 25% and not more than 60%. The bit rates of the intermediate bit rate layers are produced by applying a bit rate factor to another bit rate.