Administrative Procedure Act Article 81

Service by publication takes effect as of the date of expiry of a period of twenty days from the date on which the public notice is posted as required by the preceding article or from the last date of publication in the government gazette or newspaper as the case may be; service by publication effected pursuant to article 78, paragraph 1, sub-paragraph 3, takes effect as of the sixtieth day from the date of publication; provided, however, that service by publication under article 79 shall become effective as of the date following the date of posting on the notice board.
中文原文 行政程序法第81條
公示送達自前條公告之日起,其刊登政府公報或新聞紙者,自最後刊登之日起,經二十日發生效力;於依第七十八條第一項第三款為公示送達者,經六十日發生效力。
但第七十九條之公示送達,自黏貼公告欄翌日起發生效力。

English translation for reference only; the Chinese text prevails. Not legal advice.