Since delays are often encountered in engineering systems, ecology systems, electricity systems, management systems and control systems such as the turbojet engine, microwave oscillator, nuclear reactor, controlability of systems and optimal control, etc . the phenomena of delays are investigated by more and more scientists 在工業(yè)工程、生態(tài)系統(tǒng)、電力系統(tǒng)、管理系統(tǒng)、控制系統(tǒng)等實(shí)際系統(tǒng)中常常遇到很多時(shí)滯問題,如渦輪噴氣發(fā)動(dòng)機(jī)、微波振子、核反應(yīng)、系統(tǒng)的可控性和最優(yōu)控制等問題,所以時(shí)滯現(xiàn)象越來越受到眾多科學(xué)家的廣泛關(guān)注。