The present invention discloses a lipiodol-ferrofluid, and a process for preparation thereof, wherein the lipiodol-ferrofluid includes the ferrofluid including a magnetic component, \u03b3-Fe2O3 or Fe3O4; and the lipiodol. The switching power supply circuit provides an efficiency lower than that of the series power supply circuit under a light load and provides an efficiency higher than that of the series power supply circuit under a heavy load. Other steps performed upon execution of the computer program include upon the calculated wiring delay value of the virtual wiring path exceeding a predetermined reference value, calculating a wiring delay value of the virtual wiring path when a wide wiring line is used at a predetermined usage ratio. The at least one output port receives at least one output flow comprising the dequeued data from the at least one queue.