A p-type GaN guiding layer, an n-type GaN layer, and an n-type AlGaN current blocking layer are sequentially formed over an active layer, and then part of the current blocking layer is etched by using an alkali solution and irradiating the part with light to form an opening. The method and device of the invention capitalizes on surface temperature changes of the test structure as structural fatigue increases. A process of forming a multi-layered PCB with the optical waveguide islands using successive laminations and using laser ablation to write the optical connection scheme is taught. These vibration absorbing members are located in an intermediate portion between fixing places for fixing the cover to the base and a fixing place for fixing the cover to the pivot. The present invention includes a tub provided in a cabinet to hold water, a drum rotatably installed in the tub, at least one or more ceramics, and at least one or more ceramic receivers provided on an inside of the drum to hold the ceramic therein. In one implementation, the DTV signal is an American Television Standards Committee DTV signal.