Аннотация:In the News from Japan column in the March/April 2021 issue [1], a brief introduction of the Ninth International Symposium on Electrical Insulating Material (ISEIM) was described. It was also described that the $Q(t)$ method developed by Prof. Tatsuo Takada of Tokyo City University had been introduced in a seminar taking place in the Ninth ISEIM. As mentioned in that column, the principle of the $Q(t)$ method itself is well known. However, this revisited method is very innovative and truly useful. Regarding this, although a measurement example of the $Q(t)$ method was briefly introduced in the above March/April issue, more examples are being introduced in detail in this issue and the next issue.
