Disclosed is an improved method, system, and computer program product for performing core placement when presented with an IO ring design. In some embodiments, the FinFET varactor circuit has a FinFET MOS varactor with a first terminal connected to a gate terminal of the FinFET MOS varactor and a second terminal connected to connected source and drain terminals of the FinFET MOS varactor. A light-emitting element that has high emission efficiency can be obtained by use of the anthracene derivative represented by the general formula. The system also includes a plurality of vehicle support assemblies hanging from the elongated support member. A control shaft pivotably mounted on the control shaft mount, so that it has a stow position, and operating position, a user entry position and a table use position.