"QE May or May Not Work for Japan; Deep Negative Interest Rates Are the Surefire Way for Japan to Escape Secular Stagnation" in Japanese: QEは日本で効くかもしれないしそうではないかもしれない；大幅な負の利子率が日本が長期的停滞を抜け出す間違いのない方法 →

The link above is to the post in Japanese, translated by Makoto Shimizu. You can find the English version here.