Real-time optimization is conducted for a control device having a fuzzy inference system that can optimize characteristics of the control device in real time, by coding parameters used in the fuzzy inference system into chromosomes, and optimizing in real time the output of the control device by subjecting the chromosomes to evolutionary computation. After the temperature of the fuel cell 1 has reached a predetermined high temperature, the operation of the fuel cell 1 is stopped. The present cooling arrangement includes coolant release passages 5 which present coolant flow to coolant entrainment elements or fins 2 such that the coolant flow is entrained close to the blade tip surface 12. Therefore, the sliding pipe assembly can be moved along the horizontal frame.