Publications

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Data poisoning–the process by which an attacker takes control of a model by making imperceptible changes to a subset of the …

Paper-intensive industries like insurance, law, and government have long leveraged optical character recognition (OCR) to automatically …

Targeted clean-label poisoning is a type of adversarial attack on machine learning systems where the adversary injects a few …

The power of neural networks lies in their ability to generalize to unseen data, yet the underlying reasons for this phenomenon remains …

Clean-label poisoning attacks inject innocuous looking (and correctly labeled) poison images into training data, causing a model to …

A wide range of defenses have been proposed to harden neural networks against adversarial attacks. However, a pattern has emerged in …

Data poisoning is an attack on machine learning models wherein the attacker adds examples to the training set to manipulate the …

Inherent risk scoring is an important function in anti-money laundering, used for determining the riskiness of an individual during …

High resolution time-of-flight mass spectrometers (TOFMSs) have broad potential application in space exploration. We propose a novel …

This thesis discusses a series of advances toward - and resulting in - the demonstration of the first ultrafast THz-driven electron …

Ultrashort electron beams with a narrow energy spread, high charge, and low jitter are essential for resolving phase transitions in …

Femtosecond electron bunches with keV energies and eV energy spread are needed by condensed matter physicists to resolve state …

The cost, size and availability of electron accelerators are dominated by the achievable accelerating gradient. Conventional …

A cryogenic composite-thin-disk amplifier with amplified spontaneous emission (ASE) rejection is implemented that overcomes traditional …

A model for terahertz (THz) generation by optical rectification using tilted-pulse-fronts is developed. It simultaneously accounts for …

We report, and review in detail, experiments resulting in a record 3.7% optical-to-terahertz (THz) conversion efficiency by optical …

Terahertz (THz) generation by optical rectification (OR) using tilted-pulse-fronts is studied. A one-dimensional (1-D) model which …

The great difficulty of producing high intensity radiation in the terahertz (THz) spectral region by conventional electronics has …

Beam steering at high speed and high power is demonstrated from a 6-element optical phased array using coherent beam combining (CBC) …