Research Interests

In the past, I've worked on research projects in disease modeling, computer vision, and enumerative combinatorics. I am particularly motivated by research applicable to public health or related areas. Currently, I work with Dr. Christina Yu in the Operations Research and Information Engineering Department at Cornell University. We are working on projects broadly in the space of causal inference under network interference.

Researching and Writing
 

Publications

Exploiting neighborhood interference with low order interactions under unit randomized design

Submitted to Journal of Causal Inference in August 2022

Joint work with Matthew Eichhorn and Dr. Christina Lee Yu

Graph Agnostic Estimators with Staggered Rollout Designs under Network Interference

Accepted to Thirty-sixth Conference on Neural Information Processing Systems (NeurIPS 2022)

Joint work with Matthew Eichhorn and Dr. Christina Lee Yu

Combating Tuberculosis: Using Time-Dependent Sensitivity Analysis to Develop Strategies for Treatment and Prevention

July 29, 2019

Authors: Clark, Kendall B.; Cortez, Mayleen; Hernandez, Cristian; Thomas, Beth E.; and Lewis, Allison L. 
DOI: http://doi.org/10.30707/SPORA5.1Clark

 

Selected Projects

ORSuite: Benchmarking Suite for Sequential Operations Models (2021)

Vaccine Distribution Environment and Simulation

Reinforcement learning is a natural model for problems involving real-time sequential decision making. In these models, a principal interacts with a system having stochastic transitions and rewards and aims to control the system online (by exploring available actions using real-time feedback) or offline (by exploiting known properties of the system). This project revolves around providing a unified landscape on scaling reinforcement learning algorithms to operations research domains. I worked specifically on setting up a vaccine allocation environment, as well as a framework for simulating the impact of different vaccine allocation policies on disease spread through a population.

Properties of Peaks in Parking Functions

Mathematical Sciences Research Institute Undergraduate Program 2019

In 2013, Billey, Burdzy, and Sagan proved that there are 2n−1 permutations of length n with no peaks. In this paper, we discuss generalizations of their results where instead of permutations, we investigate parking functions with no peaks. In particular, we study certain subsets of parking functions and enumerate peaks by analyzing their valleys and plateaus. We also analyze the bijection between nondecreasing parking functions with repeating digits and certain labeled Dyck paths. For full list of collaborators, click "More" below.

Finding Waldo: An Investigation into Machine Learning for Object Detection

California State University, Channel Islands (2019)

One of the resources that Amazon Web Services provides is a platform for researchers and professionals to create, train and use models that can detect specific objects in image or video data. These object detection/recognition (ODR) models are used to detect people, cars, wildlife and other objects. The applications of ODR models extend to environmental health, public safety and general everyday-life improvement. These models allow us to use video data to do things like enumerate the number of people who are at a particular beach or to detect malfunctions on solar panels. We present an ODR model to detect the Waldo character in the popular children’s series “Where’s Waldo?” We use our results to motivate further investigations in machine learning and ODR modeling. By identifying key limitations and issues during the development of the project, we gain a better understanding of how to present project material to a population of people interested in learning more about machine learning, data collecting, and ODR modeling through AWS Sagemaker. We also discuss how we can extend “finding Waldo” to other problems, such as classifying whales by their tails or detecting faces in a video feed.

Solar Panel Hotspot Detection

California State University, Channel Islands (2018)

Although solar panels allow us to harness clean energy, their location can make maintaining them difficult. Collections of solar panels that are placed on top of tall buildings without easy roof access pose a danger and challenge to inspecting technicians. We present a possible solution to this problem in a two-part process. Using computer vision techniques and tools, we work to develop a collection of python scripts that allow for real-time detection of solar panels in an image and their hotspots using drone technology (as hotspots are a good indication of a broken solar panel). We use our results to provide a roadmap for future investigations on how to use drones to inspect solar arrays for potential malfunctions.