摘要
It has been found that a triple-node feed-forward motif has a function of signal amplification, where two input nodes receive the external weak signal and jointly modulate the response of the third output node [Liang et al.,Phys. Rev. E 88（2013） 012910]. We here show that the signal amplification can be further enhanced by adding a link between the two input nodes in the feed-forward motif. We further reveal that the coupling strength of the link regulates the enhancement of signal amplification in the modified feed-forward motif. We finally analyze the mechanism of signal amplification of such simple structure.
基金
Supported by the Program for Professor of Special Appointment（Eastern Scholar） at Shanghai Institutions of Higher Learning under Grant No.QD2015016
the National Natural Science Foundation of China under Grant Nos.11505114 and 11305078
