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Rectification of RF Fields in Load Dependent Coupled Systems: Application to non-Invasive Electroceuticals

Journal of Biomedical Science and Engineering 2016年第2期9卷 112-121页

作者： Sree N. Koneru Charles R. Westgate Kenneth J. McLeod Clinical Science and Engineering Research Laboratory Binghamton University Binghamton NY USA Department of Electrical and Computer Engineering Binghamton University Binghamton NY USA

Electroceuticals are medical devices that employ electric signals to alter the activity of specific nerve fibers to achieve therapeutic effects. The rapid growth of RF microelectronics has resulted in the development of very small, portable, and inexpensive shortwave and microwave radio frequency (RF) amplifiers, raising the possibility of utilizing these new RF technologies to develop non-contact electroceutical devices. However, the bio-electromagnetics literature suggests that beyond 10 MHz, RF fields cannot influence biological tissue, beyond simple heating, because effective demodulation mechanisms at these frequencies do not exist in the body. However, RF amplifiers operating at or near saturation have non-linear interactions with complex loads, and if body tissue creates a complex loading condition, the opportunity exists for the coupled system to produce non-linear effects, that is, the equivalent of demodulation may occur. Correspondingly, exposure of tissue to pulsed RF energy could result in the creation of low frequency demodulation components capable of influencing tissue activity. Here, we develop a one-dimen- sional, numerical simulation to investigate the complex loading conditions under which such demodulation could arise. Applying these results in a physical prototype device, we show that up to7.5% demodulation can be obtained for a 40 MHz RF field pulsed at 1 KHz. Implications for this research include the possibility of developing wearable, electromagnetic electroceutical de- vices.

关键词： RF Demodulation in Tissue non-linear coupling Complex Load-Line Electroceuticals Neuromodulation Stochastic Resonance

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RESEARCH OF NETWORK SYNCHRONIZATION BASED ON THREE-DIMENSIONAL CHAOTIC SYSTEM

RESEARCH OF NETWORK SYNCHRONIZATION BASED ON THREE-DIMENSION...

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2009 IEEE International Conference on Network Infrastructure and Digital Content（IC-NIDC 2009）

作者： Liangrui Tang Zhongmiao Kang Institude of Electric and Electronic Engineering North China Electric Power University Beijing

The network synchronization of a threedimensional chaotic system with hyperchaotic characteristics is studied in this *** synchronization properties of the network is analyzed with nonlinear coupling,also the synchronization conditions of the fully connected network and star network are *** fully connected network,symmetric non-linear coupling method is adopted to achieve its network *** for star network,its network synchronization is realized by using unidirectional non-linear ***,numerical simulation proves the validity of the methods.

关键词： chaotic system non-linear coupling chaotic synchronization network synchronization

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