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Conversion of stability observed in Van der Pol oscillator by unstable time-delayed controller
Hiroyuki Shirahama,Chol-Ung Choe,Kazuhiro Fukushima 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
We have demonstrated that an unstable time-delayed controller can provide a tool to control the stability of Hopf bifurcation. The unstable time-delayed controller has used to stabilize an unstable periodic orbit operating in subcritical mode. By developing a new coupling method the unstable timedelayed system was improved to be applied for conversion of stability in Hopf bifurcation system. In this study, as an example, conversion of stability of Van der Pol oscillator has been confirmed both experimentally and numerically. The control method would control various oscillations of systems arising from Hopf bifurcation.
Multiple-Valued Logic Clock Converter Networks
Ali Massoud Haidar,Nawar El Ahdab,Hiroyuki Shirahama,Ali Alaeldine 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
novel multiple-valued logic clock converters using artificial neural network are proposed. Based on a set of novel neural clock base converters, an essential part of the creative solution to the multiple-valued logic dual-clock or multi-clock circuit synchronization problem is presented in this paper. The multiple-valued logic neuron clock converters are planned to be useful in the multiple-valued logic neural central processing unit. The novel neural networks of the multiple-valued logic clock converters show numerous functionality features combined with design simplicity. All the converters make advantage of the logic oriented neural network mathematical tools and parallelism concepts allowing fast and simple systematic analysis. The simulation outcomes presented, pave the way toward new, stable, high speed, revolutionary neural multiple-valued logic processors.