An implantable tissue-stimulating device for an implantee. Concept-based ranking relies on the input query, that produced the search results, having pinnacle concept properties specified for some of its keyword-based search terms. A virtual machine management engine can manage one or more virtual machine instances in the virtualization environment, each of the one or more virtual machine instances operative to provide virtualized resources of the one or more host systems for a compute access system coupled to the one or more host systems. By superposition of the fluorescent radiations white light is generated at the end of the optical waveguide. Here, when performing heat radiation from the coil winding, since the cover section which abuts against the heat radiating terminal when the coil winding is fixed to the heat radiating object functions as an insulating member, then the radiation of heat from the coil winding is raised without increasing the number of parts.