A voltage level shifting circuit with an input terminal and an output terminal. The semiconductor light emitting device includes a substrate, at least two light emitting cells located on the substrate and formed by stacking semiconductor material layers, a reflection layer and a transparent insulating layer sequentially stacked between the light emitting cells, and a transparent electrode covering the upper surface of the light emitting cells. At least a part of computing units forming the system, may switch computing function in at least part of computing functions for performing discrete cosine transform and inverse discrete cosine transform for points other than N points, for performing the W point discrete cosine transform and inverse discrete cosine transform in parallel by the computing units forming the system. The third light emitting element includes a third transparent anode, the cathode, and a third light emitting function layer including a third luminescent layer which emits a third light of a third color, which is different from the first and second colors. This minimises stress on the skin and reduces the chance of detachment from the skin. In one embodiment and by way of example, a method includes receiving a job request from a user associated with an organization, where the job request may is placed at a computing device.