The space business is expected to expand as an industry that contributes to Japan's economic growth. In order to nurture young engineers who will lead the future, education to create ideas that will trigger innovation is needed. Therefore, we propose an educational method for space business idea creation in university education. We presented examples of technology and applications of the Japanese positioning satellite MICHIBIKI, and had students learn how to analyze them from the viewpoint of business ideas. Students analyzed the case studies, found areas for improvement, and created ideas. The ideas were brushed up through group discussions among the students, and became effective ideas for space business. By comparing the results of the group discussion with those of the idea generation, the students were able to deepen their understanding of a broader perspective. This method proved to be applicable to other space businesses such as weather satellite data.

Polyimide (PI), polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) films have been widely used in industrial high-voltage and high-field products. We measured the partial discharge (PD) currents over these films as an important PD characteristic. We measured PD currents over those films with thicknesses of 25, 50, and 75 µm under an AC peak voltage of 1-3 kV at 50-1000 Hz. The experimental PD system used in this study is an IEC(b) electrode. It has a cylindrical high-voltage rod electrode with a diameter of 6 mm and an edge radius of 1 mm. The total PD current-flow circuit length was less than 150 mm for fast-current shape measurements. The PD current waveforms had a peak time of 5-20 ns for the positive pulses and 5-10 ns for the negative pulses. Peak time is defined as the time from the beginning of the current to the current peak. It was found that these values changed with the film material and thicknesses.

Previous studies have aimed to elucidate the principles of whistling by constructing vocal tract models using computed tomography data of the vocal tract during whistling. In addition, studies have been conducted on whistling pitch change models, in which the plates of the vocal tract model are adjusted to simulate changes in the vocal tract shape due to pitch changes. However, these studies often required manual operation of measuring devices and the interpretation of gauges. In this study, we developed a device that automates the measurement of sounds emitted by a vocal tract model during whistling. Using this device, we estimated the duration during which a stable whistling sound was generated and examined a method to measure the fundamental frequency and flow rate when the sound quality was optimal. Consequently, the device can automatically adjust, measure the flow rate, and analyze the generated sound. Furthermore, by using the distortion rate, we could estimate the period during which a whistling sound was generated and determine the fundamental frequency at which the sound quality was optimal.