Publications

Autonomous laboratories increasingly enable materials synthesis at scale, but traditional high-throughput characterization workflows remain limited by the need for expert chemical intuition to distinguish plausible interpretations from formally good but chemically incorrect fits. We present an automated interpretation framework that combines probabilistic inference with automated chemical reasoning for phase identification from powder x-ray diffraction (PXRD). The framework evaluates multiple candidate interpretations using diffraction pattern-based metrics. It then refines these likelihoods using chemically-informed priors derived from composition balance and a large language model (LLM)–based plausibility estimate with human-readable justification and also produces a trustworthiness score. In a blinded multi-project benchmark, the framework's top-ranked interpretation was selected over the lowest-𝑅wp baseline in 93% of cases where evaluators expressed a clear preference (95% CI: [78%, 98%], 𝑛 =30). Trust decisions made by the framework aligned with expert judgment in approximately 75%–80% of cases. In a second evaluation, the framework systematically identified cases where lowest-𝑅wp interpretations were chemically implausible and surfaced credible alternatives to historically ambiguous samples. By reframing phase identification as a problem of probabilistic reasoning and trust-aware decision making, this work demonstrates how chemical intuition can be automated and scaled.

Large language models (LLMs) often exhibit sycophancy, optimizing for agreement over productive challenge, which severely limits their utility in domains like professional skills training, where growth requires pushback. We introduce, ConvoDojo, a novel conversational AI platform for practicing difficult workplace conversations, engineered not merely as a commercial training application but also as a flexible, instrumented research platform for evaluating conversational AI strategies. ConvoDojo repurposes LLMs as structured sparring partners to support skill development in difficult workplace conversations (e.g., performance feedback, conflict resolution), addressing the reported managerial tendency to avoid them. This paper showcases the platform and presents an evaluation of how key conversational user interface (CUI) design elements, namely, the addition of structured feedback and upfront instructional scaffolding, impact managers’ learning. Results show that ConvoDojo is highly engaging and promotes user reflection. We demonstrate how theory-informed dialogue and adaptive pushback can transform an LLM into an effective, measurable tool for complex communication skills development.

Proximal methods such as the Alternating Direction Method of Multipliers (ADMM) are effective at solving constrained quadratic programs (QPs). To tackle infeasible QPs, slack variables are often introduced to ensure feasibility, which changes the structure of the problem, increases its size, and slows down numerical resolution. In this letter, we propose a simple ADMM scheme to tackle QPs with slack variables without increasing the size of the original problem. The only modification is a slightly different projection in the z-update, while the rest of the algorithm remains standard. We prove that the method is equivalent to applying ADMM to the QP with additional slack variables, even though slack variables are not added. Numerical experiments show speedups of the approach.

The discovery of advanced battery electrolytes is challenged by the vast compositional space of multi-component liquid formulations. Here, we introduce the ELectrolyte Laboratory for Integrated Experimentation (ELLIE), an automated platform that combines electrolyte formulation and impedance spectroscopy to map ionic conductivity across high-dimensional sodium electrolytes containing up to five salts and 15 solvents, generating an experimental dataset spanning nearly two orders of magnitude in conductivity. 23Na NMR, Raman spectroscopy, and viscosity measurements on a subset of electrolytes at a fixed salt concentration reveal that conductivity is jointly influenced by Na+ solvation strength, ion association, and solvent dynamics and positively correlates with inverse viscosity. Conductivity estimates based on the Nernst-Einstein relation captures broad concentration and viscosity relationships but do not extrapolate well across compositionally diverse electrolytes. Random forest modeling identifies lower solvent molecular weight as the dominant descriptor of high conductivity. Together, these results establish solvent molecular size as a physically interpretable descriptor of ion transport and demonstrate how automated experimentation can accelerate data-driven electrolyte optimization across complex compositional spaces.

Generative AI enables designers to more broadly and rapidly explore design spaces. However, the sheer scale at which designs can be generated makes it difficult to identify which generated concepts deserve further attention. To support this identification process, we explore pupillometry—specifically pupil dilation—as a support signal for design evaluation. We conducted a study with 40 participants who viewed AI-generated bicycle designs while wearing eye tracking glasses to measure pupil dilation and rated designs on perceived surprise, valence, and feasibility.

Creative professionals often experience "stuckness," moments when ideas stall, or motivation fades. We define creative stuckness as a temporary state of self-regulatory misalignment - an impasse marked by perceived obstruction of progress and dysregulation of attention, affect, and motivation. Unstuck is a ubiquitous just-in-time system that detects contextual cues of stuckness and delivers brief, autonomy-preserving micro-interventions. A formative study with twelve professionals identified these mechanisms and informed a library of 98 interventions spanning embodied, cognitive, and reflective strategies. In a five-week deployment with 225 creative professionals (106 Control, 58 Random, 61 adaptive MLB), both intervention arms improved creative self-efficacy, coping, and wellbeing and produced consistent creativity boosts. 77% reported that Unstuck helped them manage their creativity and focus. Three months later (N=110), nearly 60% continued using Unstuck-inspired strategies such as mindful resets, reframing, and movement. These findings show that short, context-aware interventions can transform transient impasses into lasting self-regulation and creative wellbeing.

Curated datasets are essential for training and evaluating AI approaches, but are often lacking in domains where language and physical action are deeply intertwined. In particular, few datasets capture how people acquire embodied skills through verbal instruction over time. To address this gap, we introduce SIMCOACHCORPUS: a unique dataset of race car simulator driving that allows for the investigation of rich interactive phenomena during guided and unguided motor skill acquisition. In this dataset, 29 humans were asked to drive in a simulator around a race track for approximately ninety minutes. Fifteen participants were given personalized one-on-one instruction from a professional performance driving coach, and 14 participants drove without coaching. SIMCOACHCORPUS includes embodied features such as vehicle state and inputs, map (track boundaries and raceline), and cone landmarks. These are synchronized with concurrent verbal coaching from a professional coach and additional feedback at the end of each lap. We further provide annotations of coaching categories for each concurrent feedback utterance, ratings on students' compliance with coaching advice, and self-reported cognitive load and emotional state of participants (gathered from surveys during the study). The dataset includes over 20,000 concurrent feedback utterances, over 400 terminal feedback utterances, and over 40 hours of vehicle driving data. Our naturalistic dataset can be used for investigating motor learning dynamics, exploring linguistic phenomena, and training computational models of teaching. We demonstrate applications of this dataset for in-context learning, imitation learning, and topic modeling.

Storybook Futures is a public interactive-media installation for exploring speculative narratives. Inspired by Storybook, a web platform for creating illustrated stories that support perspective-taking and career reflection, Storybook Futures is a walk-up kiosk in which people can see themselves in a possible future. A tablet-sized controller lets participants choose among dozens of seeded paths and then branch through an illustrated story by selecting between two deliberately value-laden futures: one oriented toward well-being and one oriented toward career and financial advancement. A synchronized large display shows each chapter at audience scale, while a webcam-driven self-insertion pipeline regenerates the current scene using the participant’s face. The result is a walk-up demo that combines branching narrative and generative text and imagery that inspires questions of people’s place in the world, surveillance, and the role of AI in both. We position the system as both a narrative experience and a conversation prompt about perspective-taking, labor futures, and the politics of interactive media.

We propose a fast and correspondence-free local point cloud registration method that leverages geometric surface structure and reproducing kernel Hilbert space (RKHS) embeddings. The method represents point clouds as continuous functions with point-wise anisotropic kernels that encode local geometry. This formulation improves alignment along surface normals while relaxing alignment along tangential directions. To solve the resulting registration problem, we propose a second-order on-manifold optimization scheme with approximate Riemannian Hessians, achieving a speedup of up to 10x over the first-order solvers used in prior correspondence-free RKHS-based methods. We demonstrate improved frame-to-frame LiDAR and RGB-D tracking accuracy across diverse indoor and outdoor datasets. On a LiDAR tracking registration task in the driving domain, we achieve a reduction of > 55% in both translational and rotational drift in challenging feature-sparse environments. On object registration benchmarks, we show improved robustness over ICP-based methods and further gains when refining global initialization, particularly under moderate misalignment.

Gaze behavior is widely treated as a trainable component of high-performance driving, yet its causal role in performance remains unclear. We tested whether enforcing expert gaze patterns improves circuit driving performance in a simulator study with 60 participants assigned to free gaze, skilled-gaze guidance, or novice-gaze guidance. Gaze guidance replayed naturalistic gaze trajectories from actual skilled and novice drivers during training, followed by an unguided retention session. Despite clear compliance with gaze instructions during training, gaze guidance had no significant effect on lap time, steering or pedal smoothness, or lateral deviation from an optimal racing line, aside from a minimal per-corner difference. Performance improvements were attributable to practice and persisted independently of gaze condition. These findings suggest that gaze guidance alone is insufficient to improve high-performance driving, underscoring the need for training approaches that integrate it with additional instruction or feedback.