The present invention describes a process for converting a terminal alkyne into an alkynoic acid. The planar elastic member has upper and lower layers at a location close to the front frame with a predetermined space created between the upper and lower layers. This results in a hybrid method, in which the strength of at least two measurement methods are used in a combined form, and specific weaknesses of any one method are avoided. Bearings disposed between the base and the carriage support the carriage on the base and permit relative movement thereof. The protection domain system provides flexibility in implementing operating system services and defining protection hierarchies. In performing the FFT for processing N input signals, four N4-point FFT units implemented by radix-2 single-path delay feedback units performs the FFT with respect to the input signals, and a radix-4 computation unit performs a radix-4 computation with respect to the signals transferred from the N4-point FFT units.