Abstract: An unsupervised density-ratio estimation (DRE) based approach is used to determine statistical changes in time-series data when no knowledge of the pre- and post-change distributions are available. The core idea behind the disclosed technology is to split the time-series at an arbitrary point and estimate the ratio of densities of distribution (using a parametric model such as a neural network) before and after the split point. The DRE-CUSUM change detection statistic is then derived from the cumulative sum (CUSUM) of the logarithm of the estimated density ratio. Theoretical justification as well as accuracy guarantees are provided which show that the proposed statistic can reliably detect statistical changes, irrespective of the split point. The disclosed framework makes it readily applicable in various practical settings (including high-dimensional time-series data).

Abstract: A storage tank apparatus and a method for determining a bottom plate health for the apparatus is disclosed. A storage tank apparatus includes a tank foundation having a bottom plate support surface and at least one foundation tube housed inside at least one foundation channel, a bottom plate, a tank shell, at least one shell tube, at least one foundation inspection window, at least one shell inspection window and testing equipment that is operatively connected to the foundation tube and shell tube. A method for determining a bottom plate health for a storage tank apparatus includes operatively connecting the testing equipment to the foundation tube and shell tube, measuring a first and a second level of corrosion respectively, accessing the testing equipment by a computer processor, storing the first and second level of corrosion and determining the bottom plate health while the storage tank apparatus is in service.

Abstract: A portable corrosion monitoring device is described that includes at least one corrosion monitoring sensor, a wireless transceiver configured to receive signals from a plurality of remote wireless beacons, a microprocessor containing executable instructions to determine the spatial position of the portable corrosion monitoring device based, at least in part, on the signals received from the plurality of remote wireless beacons, and a visual display to communicate instructions to an operator of the portable corrosion monitoring device.

Abstract: Systems and methods for providing phase shifting in antenna arrays, such as phased antenna arrays of 5G cellular technology, are disclosed. In one aspect, an example phase shift module may include a phase shifter and a frequency multiplier. The phase shifter is configured to receive an LOcal oscillator (LO) signal and output a signal that is phase-shifted by a desired phase shift with respect to the LO signal. The frequency multiplier may be an enhanced frequency multiplier, configured to use not only the phase-shifted signal but also an inverted version of the phase-shifted signal to generate a frequency-multiplied signal having a frequency that is a multiple of the LO signal frequency. In another aspect, an example phase shift module may be configured to apply to an LO signal a phase shift that takes into consideration variations of phase shift over temperature.

Abstract: A method for using a breadboard involves receiving a circuit wiring connection layout, in which the circuit wiring connection layout includes a visual representation of circuit elements. The method further involves sending, to the breadboard, the circuit wiring connection layout, receiving a selection of a circuit element from the circuit elements to obtain a selected circuit element, sending, to the breadboard and based on the selected circuit element, a signal to activate an alert device on the breadboard indicating where a user should place the selected circuit element on the breadboard, receiving a circuit characteristic to measure from the selected circuit element, sending, to the breadboard, the circuit characteristic to measure from the selected circuit element, receiving, from the breadboard, a measurement of the circuit characteristic to obtain a measured circuit characteristic, and displaying the measured circuit characteristic.

Abstract: A method for using a breadboard involves receiving a circuit wiring connection layout, in which the circuit wiring connection layout includes a visual representation of circuit elements. The method further involves sending, to the breadboard, the circuit wiring connection layout, receiving a selection of a circuit element from the circuit elements to obtain a selected circuit element, sending, to the breadboard and based on the selected circuit element, a signal to activate an alert device on the breadboard indicating where a user should place the selected circuit element on the breadboard, receiving a circuit characteristic to measure from the selected circuit element, sending, to the breadboard, the circuit characteristic to measure from the selected circuit element, receiving, from the breadboard, a measurement of the circuit characteristic to obtain a measured circuit characteristic, and displaying the measured circuit characteristic.

Abstract: A method for generating precedence-preserving crossover and mutations operations for genetic algorithms is provided. The method is based on the determination of activities' Forward Free Float (FFF) and Backward Free Float (BFF) values, utilizing these float values in randomly selected forward and backward paths, respectively. The method may be applied to the finance-based scheduling domain using large scale projects, with the chromosomes of the genetic algorithm encoding activities' start times in a resource-constrained scheduling problem.

Abstract: A method for generating precedence-preserving crossover and mutations operations for genetic algorithms is provided. The method is based on the determination of activities' Forward Free Float (FFF) and Backward Free Float (BFF) values, utilizing these float values in randomly selected forward and backward paths, respectively. The method may be applied to the finance-based scheduling domain using large scale projects, with the chromosomes of the genetic algorithm encoding activities' start times in a resource-constrained scheduling problem.