A formula is proposed to quantitatively estimate the signal emission rate of Communicating Extra-Terrestrial Intelligent civilizations (CETIs) in the Galaxy. I suggest that one possible type of CETI signal would be brief radio bursts similar to fast radio bursts (FRBs). A dedicated search for FRB-like artificial signals in the Galaxy for decades may pose a meaningful upper limit on the emission rate of these signals by CETIs. The Fermi-Hart paradox is answered in terms of not having enough observing times for this and other types of signals. Whether humans should send FRB-like signals in the far future is briefly discussed.

中文翻译：

---

定量评估星系中的地球外智能文明的传播以及类FRB信号的情况

提出了一个公式，用于定量估计银河系中正在传播的外星智能文明（CETI）的信号发射率。我建议CETI信号的一种可能类型是类似于快速无线电脉冲串（FRB）的短暂无线电脉冲串。数十年来，在银河系中专门搜索类似FRB的人造信号可能会对CETI发出的这些信号的发射速率造成有意义的上限。费米-哈特悖论的回答是，对于此类信号和其他类型的信号没有足够的观察时间。简要讨论了人类是否应在不久的将来发送类似FRB的信号。