Through my forty years of experience as an electromechanical engineer, I have realized that the development of technical design has been one of the most important elements necessary for Japanese industrial expansion. The cost reduction of the products, along with quality assurance and functional improvements, is one of the main purposes of the technological progress; and it is a difficult challenge. To achieve this purpose, engineers are requested to design smaller, lighter products with fewer parts. In other words, engineering designers must adopt the new technologies in order to reach their target. This demand stimulates Research and Development (R&D) activity in many related fields.