A system and method are proposed wherein knowledge and tools for solving business problems are accessible through a single distribution point. The chamber includes an element insertionextraction part, a tapered part, and a gas introduction part. Due to the nitroxyl group on the adamantane skeleton, the \u03b1-position hydrogen is stabilized based on Bredt’s rule and the stability of the oxoammonium group generated by the oxidation thereof is ensured. Also, apparatus for creating the constant illumination angle include an optical deflecting mask and an afocal optical system. During weaving, yarns of a first group of longitudinal yarns are extracted from the fiber blank beside one of side faces of the blank to form a portion corresponding to a blade platform preform, and yarns of a second group of longitudinal yarns are inserted into the fiber blank with mutual crossing of the yarns of the first group and the yarns of the second group.