“…Delay is often encountered in various engineering systems, and the existence of delay is frequently a source of instability and poor performances. According to whether they are dependent on delay or not, the controls of singular systems can be classified into two types: delay-dependent control [3, 4, 6, 7, 9, 10, 14−19] and delay-independent control [5,8,18,20] . Generally speaking, delay-dependent results are less conservative than the delay-independent ones, especially when the upper bound of the delay is small.…”