摘要
It has been found that a hub node is better able to amplify weak external signals than leaf nodes in star networks.But hub-enhanced amplification is only attained by a single hub node and is limited to weak coupling strength.We show here that random initial phases in external weak signals do not affect the hub-enhanced amplification at weak coupling strength.Instead,they can improve the responses of all the leaf nodes to external signals at large coupling strength,resulting in a double resonance-like signal amplification.We use a reduced model to analyze the influence of the star structure and random initial phases on the emergence of double resonance.
基金
Supported by the NNSF of China under Grants No.11305078 and No.61877030。
