Journal of Biomedical Systems & Emerging Technologies

The recent trend of accidental fatal electrocutions in Japan has plateaued, although overall, the trend is decreasing. There were 15 fatal electrical accidents in 2012, 5 in 2013, and 15 in 2014. The total number of fatal electrocutions in Japan will exceed 8000 during 1959-2040. Thus, it is necessary to consider further preventive measures to save the lives of workers. However, the prevention of accidental fatal electric shocks is not a trivial matter. The main reason is that there are 60 million workers in all industries, including 15 million in the construction and manufacturing industries. The construction industry, including electrical construction, accounts for approximately 60% of all fatal electrical accidents. A similar number of fatal electrical accidents occur every year. Furthermore, as designing thorough preventive measures is not easy, a new design approach is required. In this study, a detailed analysis of recent fatal electrical accidents is performed, considering case studies from 2012- 2014. The goal of this study is to save the lives of workers by preventing fatal electrical accidents.

Sterilization using UV-C light has the potential to damage pathogenic bacteria and virus. However, it also has disadvantages such as material deterioration, cellular destruction and limited use depending on the sterilization target. In this study, we focus on the UVA1 light, which is near visible light, but has the potential to induce apoptosis in the cancer cells. To investigate the sterilization characteristics of UVA1 light, three peak wavelengths of 365, 385 and 405 nm were applied by UVA1-LED on E. coli colonies with irradiation doses of 0 (control), 10, 50 and 100 J/ cm2. Comparing the three peak wavelengths, 365 nm showed a significant effect with an irradiation dose of 100 J/ cm2 after which the colony growth was greatly reduced. These results show that a peak wavelength of 365 nm is sufficient and effective for sterilization if applied with a high power light source, possibly achieving the same effect as sterilization with UV-C light.

Electronic device may malfunction owing to electrostatically induced voltages. Malfunctions or failures can occur
because of induced voltages in the range of 10 V. Charged human bodies can occasionally reach as high as 10 kV
in offices. When such an object moves near the metal housing of electronic device, a high induced voltage can
occasionally be generated in the case. In experiments, the induced voltages in two metal cases are measured using
two spark gaps and two electromagnetic wave sensors when the charged object moves away from the metal case
and passes by another case. The results will be helpful in the consideration of preventive measures for electronic
device.