Techniques are disclosed for evaluating tuples for processing by a stream application having a plurality of process elements. The fuel electrode and the oxygen electrode can include current collectors containing carbon nano-tubes to facilitate the manufacture of the fuel cell and the performance thereof. If a malfunction with a servomotor is detected by the malfunction detecting unit, the malfunctioning servomotor is no longer subject to deceleration control, a deceleration pattern including a combination of normal servomotors is read from the deceleration pattern storage unit, and then braking control is performed by using this deceleration pattern. An adjustable collar coupled to the upper locking ring and the lower base ring and interposed therebetween is provided for adjustably supporting a light emitting diode module over a plurality of light distribution angles.