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View article: The van der Pol physical reservoir computer
The van der Pol physical reservoir computer Open
The van der Pol oscillator has historical and practical significance to spiking neural networks. It was proposed as one of the first models for heart oscillations, and it has been used as the building block for spiking neural networks. Fur…
View article: Field-programmable analog array (FPAA) based four-state adaptive oscillator for analog frequency analysis
Field-programmable analog array (FPAA) based four-state adaptive oscillator for analog frequency analysis Open
Adaptive oscillators are a subset of nonlinear oscillators that can learn and encode information in dynamic states. By appending additional states onto a classical Hopf oscillator, a four-state adaptive oscillator is created that can learn…
View article: Chaos in a Pendulum Adaptive Frequency Oscillator Circuit Experiment
Chaos in a Pendulum Adaptive Frequency Oscillator Circuit Experiment Open
Adaptive oscillators can learn and encode information in dynamic, plastic states. The pendulum has recently been proposed as the base oscillator of an adaptive system. In a mechanical setup, the horizontally forced pendulum adaptive freque…
View article: Stability and Performance of an Undersea Kite Operating in a Turbulent Flow Field
Stability and Performance of an Undersea Kite Operating in a Turbulent Flow Field Open
In this paper, we examine the effects of flow disturbances resulting from turbulence on the dynamic behavior of an underwater energy-harvesting kite system that executes periodic figure-8 flight. Due to the periodic nature of the kite’s op…
View article: Hopf Physical Reservoir Computer for Reconfigurable Sound Recognition
Hopf Physical Reservoir Computer for Reconfigurable Sound Recognition Open
The Hopf oscillator is a nonlinear oscillator that exhibits limit cycle motion. This reservoir computer utilizes the vibratory nature of the oscillator, which makes it an ideal candidate for reconfigurable sound recognition tasks. In this …
View article: Genetic algorithm shape optimization to manipulate the nonlinear response of a clamped-clamped beam
Genetic algorithm shape optimization to manipulate the nonlinear response of a clamped-clamped beam Open
Dynamical systems, which are described by differential equations, can have an enhanced response because of their nonlinearity. As one example, the Duffing oscillator can exhibit multiple stable vibratory states for some external forcing fr…
View article: Experimental Validation of a Chaotic Jerk Circuit Based True Random Number Generator
Experimental Validation of a Chaotic Jerk Circuit Based True Random Number Generator Open
A method for true random number generation by directly sampling a high frequency chaotic jerk circuit is explored. A method for determination of the maximum Lyapunov exponent, and thus the maximum bit rate for true random number generation…
View article: Local dynamic stability of the lower-limb as a means of post-hoc injury classification
Local dynamic stability of the lower-limb as a means of post-hoc injury classification Open
Since most sporting injuries occur at the lower extremity (50% to 66%) and many of those injuries occur at the knee (30% to 45%), it is important to have robust metrics to measure risk of knee injury. Dynamic measures of knee stability are…
View article: A four-state adaptive Hopf oscillator
A four-state adaptive Hopf oscillator Open
Adaptive oscillators (AOs) are nonlinear oscillators with plastic states that encode information. Here, an analog implementation of a four-state adaptive oscillator, including design, fabrication, and verification through hardware measurem…
View article: Generations from genetic algorithm
Generations from genetic algorithm Open
The generations from the genetic algorithm are provided here. "M" refers to mutation step, and "C" refers to crossover step. The .csv files contain the control points.
View article: Asphaltophones: Modeling, analysis, and experiment
Asphaltophones: Modeling, analysis, and experiment Open
The asphaltophone is a musical instrument consisting of (1) a specially designed road surface topology, (2) the tire's contact patch, and (3) the vehicle itself. Each of these components in the asphaltophone has an analogy in the phonograp…
View article: High frequency realization of non-autonomous nonlinear transistor circuit
High frequency realization of non-autonomous nonlinear transistor circuit Open
In this paper, an electronic implementation of a non-autonomous nonlinear transistor circuit is presented. This nonlinear circuit topology requires a minimal number of components, which consists of two resistors, two capacitors, and a sing…