A clock control circuit comprises a control circuit 102 for outputting a control signal for adding or subtracting a phase to a reference clock, which is an input clock or a clock generated from the input clock, on each clock period of the reference clock, and a phase adjustment circuit 101 fed with the input clock and outputting an output clock having the phase adjusted to the reference clock. The method includes electrospinning a polymer fiber from a conducting fluid in the presence of a first electric field established between a conducting fluid introduction device and a ground source and modifying the first electric field with a second electric field to form a jet stream of the conducting fluid. on a particular line going in and out of failure without raising an alarm or the like.