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This paper addresses the problem of constructing Lyapunov-Krasovskii functionals for verifying integral input-to-state stability(iISS) and input-to-state stability(ISS) of time-delay nonlinear systems. Based on decomposition of a time-delay system into a dynamic component (a functional differential equation) and static components (functional algebraic equations), this paper develops an iISS small-gain...
This paper considers networks consisting of integral input-to-state stable (iISS) subsystems and addresses the problem of verifying iISS property of a given network. First, we focus on construction of continuously differentiable Lyapunov functions, and derive a condition ensuring the iISS of the network comprising n subsystems. Although this approach referred to as the sum-type construction has not...
This paper presents further results on the problem of establishing stability of retarded nonlinear interconnected systems comprising integral input-to-state stable subsystems. It is shown that the stability of the interconnected systems with respect to external signals can be verified by constructing Lyapunov-Krasovskii functionals explicitly whenever small-gain type conditions are satisfied. The...
A method for attacking an additive watermark is proposed. A watermark pattern is estimated by applying a local Wiener filter to each frequency band of the stego signal. The method exploits local differences in power spectrum density (psd) between the watermark and the host signals. Experiments have shown that the attack is more than 10 times effective compared to the existing global Wiener attack...
Theory and experiments are presented of modal decomposition of scattering matrices of multiconductor transmission lines (TLs). In effect, n coupled TLs are decomposed into n independent ones. Its use is demonstrated by applying it to thru-only de-embedding of 4 coupled TLs (synthesized data) and 2 coupled TLs (measurement data from a 0.18 mum-CMOS chip). The proposed de-embedding method could greatly...
In this paper, we propose adaptive control of robotic embodied entrainment to multi communication participants. That is based on communication activity measurement, and uses interaction timing learning which depends on nonverbal communication channels. Our mechanism selects an appropriate embodied robotic behavior, and increases the communication activity by changes of a speaker and a listener. For...
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