An image processing method for generating a halftone pattern for forming an image according to input image data includes a step of forming first and second shade patterns to be developed by first and second toners, respectively. The present invention is founded on the basic principle of searching for unambiguous roots in both documents. Then at least one carbon nanotube is synthesized from the catalyst region. The energy managing circuit sets the bidirectional power converter to a current-regulating mode so as to enable the bidirectional power drive to obtain the power required for driving from the electrical grid when the generator is operated in a motor mode. Thereby, downsizing of the package and stable manufacturing are realized. The umbilical locator rests easily and with great stability over the umbilicus while the surgery is performed.