Abstract: A waveform capture device (WCD) is a flexible measurement system capable of recording complex digital signals on trillionth-of-a-second (ps) time scales. The WCD may be implemented via modular code on an off-the-shelf field-programmable gate-array (FPGA), and incorporates both time-to-digital converter (TDC) and digital storage oscilloscope (DSO) functionality. The device captures a waveform by taking snapshots of a signal as it propagates down an ultra-fast transmission line known as a carry chain (CC). It may be calibrated via a dynamic phase-shifting (DPS) method that requires substantially less data and resources than conventional techniques.

Abstract: A method (200) for evaluating random symbols includes generating random symbols from a chaotic system (210), evaluating an output of the chaotic system by a raw entropy estimator and by a Lyapunov exponent estimator (220) and verifying a plurality of parameters based on the on the outputs of the raw entropy estimator and the Lyapunov exponent estimators (230).

Abstract: A method for generating dynamical systems that can be instantiated on reconfigurable computing platforms for solving instances of the Boolean satisfiability problem (SAT) is disclosed. When the SAT instance can be satisfied by an appropriate assignment of the variables, the dynamical system has a fixed point attractor that corresponds to a satisfying assignment of variables. When the SAT instance cannot be satisfied by any assignment of variables, there is no such fixed point attractor. Exemplary embodiments represent a physically-realizable computing device that solves SAT problems outside the Turing machine paradigm. Exemplary embodiments detect when the system reaches a fixed point attractor.

Abstract: A method for processing record requests on an app running on a computing device includes entering user information, identify the records, validating the user, determining if the app is running on a device having a specific functionality, selectively instructing the user to provide verifying information based on the determined device functionality, validating the verifying information and providing the records to the user.