Abstract: In a butt-welded joint structure in which the entire peripheral edge or both end sides of the abutting surface are welded, first and second cutouts for determining insufficient penetration and determining excessive penetration are formed. After butt welding, ultrasound is beamed onto each of the first and second cutouts of the joint structure and the reflected wave is measured. The acceptability of the weld penetration depth is thus determined on the basis of both of the reflected waves. This determination is performed on the entire peripheral edge portion or both end side portions of the butted face between the welded materials, and the acceptability of the weld penetration depth of the corresponding portions is inspected.

Abstract: According to the present invention, a protein having peptide-synthesizing activity, a DNA encoding the protein, a recombinant DNA containing the DNA, a transformant obtained via transformation with the recombinant DNA, a process for producing a protein having peptide-synthesizing activity using the transformant and the like, a process for producing a peptide using a protein having peptide-synthesizing activity, and a process for producing a peptide using as an enzyme source a culture or the like of a transformant or a microorganism producing a protein having peptide-synthesizing activity are provided.

Abstract: Control characteristics of a control object including a specimen (10), a hydraulic cylinder (12), and a servo valve (16) are expressed in a model, and stored in a model storage section (34). In modeling, dynamical characteristic values (a mass M, a damping coefficient C, a spring constant K) of a specimen (10) are expressed is variables. After substituting the actual characteristic values of a specimen (10) to be tested in the variables of the model, a simulation is run using the model to obtain an optimal feedback gain. When the optimal feedback gain is determined, the pole position of the corresponding system to be controlled is specified. Thereafter, when different specimens (10) having different characteristics are tested, optimal feedback gains for the respective systems are determined by calculating a value which ensures the respective systems the same pole position as the above.