Preprints and Working Papers

1. Counterfactual fairness through transforming data orthogonal to bias.
   S. Chen and S. Zhu. 
2. Conditional generative representation for black-box optimization with implicit constraints.
   W. Xing, J. Lee, C. Liu, and S. Zhu.
   • A short version is accepted as a referred paper for 2024 INFORMS Optimization Society Conference. 
3. Assessing electricity service unfairness with transfer counterfactual learning.
   S. Wei, X. Kong, A. Santos Xavier, S. Zhu, Y. Xie, and F. Qiu. 
   • A short version is accepted by Causal Representation Learning Workshop at NeurIPS 2023. 
4. Uncertainty-aware robust learning on noisy graphs. [Code]
   S. Chen, K. Ding, and S. Zhu.
   • A short version is accepted by New Frontiers in Graph Learning Workshop at NeurIPS 2023. 
5. Conditional generative modeling for high-dimensional marked temporal point processes. [Code]
   Z. Dong, Z. Fan, and S. Zhu.
   • A short version is accepted by NeurIPS 2023 Workshop on SyntheticData4ML. 
6. Counterfactual generative models for time-varying treatments. [Slides] [Poster] [Code]
   S. Wu, W. Zhou, M. Chen, and S. Zhu.
   • Spotlight, Deep Generative Models for Health (DGM4H) Workshop at NeurIPS 2023 (Five out of 44 accepted papers). 
   • Winner, 2023 YinzOR Poster Competition, Awarded to Student Author (Wenbin Zhou).
   • A short version is accepted by Causal Representation Learning Workshop at NeurIPS 2023. 
7. Generalized Hypercube queuing models with overlapping service regions. [Code]
   S. Zhu, W. Xing, and Y. Xie.
8. Quantifying grid resilience against extreme weather using large-scale customer power outage data. 
   S. Zhu, R. Yao, Y. Xie, F. Qiu, Y. Qiu, and X. Wu.
9. Multi-resolution spatio-temporal prediction with application to wind power generation. [Slides] [Poster]
   Z. Dong, H. Zhang, S. Zhu, Y. Xie, and P. Van Hentenryck. 
   • Finalist of 2023 QSR Best Student Paper Competition, Awarded to Student Author (Zheng Dong). 
   • Finalist of Best Applied Paper Competition at 2023 INFORMS Workshop on Data Mining and Decision Analytics.
   • Best Student Paper Nominee & full presentation at 2022 INFORMS Workshop on Data Science.
10. Balanced districting with provable compactness and contiguity. [arXiv]
    C. Hettle, S. Zhu, Y. Xie, and S. Gupta.
    • A short version is accepted for presentation by FORC 2021, non-archival track.

Journal

1. Non-stationary spatio-temporal point process modeling for high-resolution COVID-19 data. [arXiv] [Poster] [Code]
   Z. Dong, S. Zhu, Y. Xie, J. Mateu, and F. J. Rodríguez-Cortés.
   Journal of the Royal Statistical Society, Series C. Vol. 72, Issue 2, Pages 368–386, May 2023.
   • Winner, 2022 INFORMS Data Mining Best Applied Paper.
   • Runner up, 2022 INFORMS Poster Competition.
   • Accepted  for presentation at 2022 INFORMS Workshop on Data Science.
2. Sequential adversarial anomaly detection for one-class event data. [arXiv] [Slides] [Code]
   S. Zhu, H. Yuchi, M. Zhang, and Y. Xie.
   INFORMS Journal on Data Science. Vol 2, No. 1, Pages 45-59, Mar 2023.
   • Runner up, Best Applied Paper Competition at 2020 INFORMS Workshop on Data Mining and Decision Analytics.
   • A short version is accepted for presentation by ICASSP 2021.
3. Data-driven optimization for Atlanta police zone design. [arXiv] [Slides] [Code]
   S. Zhu, H. Wang, and Y. Xie.
   INFORMS Journal on Applied Analytics (formerly Interfaces). Vol. 52, Issue 5, Pages 412-432, Oct 2022.
   • Finalist of 2021 INFORMS Wagner Prize. 
   • 2nd place in 2019 INFORMS Doing Good with Good OR Best Paper Competition.
   • The proposed zone design was adopted by Atlanta Police Department and implemented in 2019.
4. Spatio-temporal-textual point processes for crime linkage detection. [arXiv] [Poster] [Code]
   S. Zhu and Y. Xie.
   Annals of Applied Statistics. Vol. 16, No. 2, Pages 1151-1170, June 2022.
   • Selected to be presented in The Best of AOAS Session at JSM 2022 (Only three out of all papers).
   • Best Poster Presentation Award at 2018 Forecasting from Complexity Workshop.
   • Best Student Poster Award at Georgia Statistics Day 2018.
   • The project won the 2018 Smart 50 Award at the Smart Cities Connect Conference & Expo.
   • The proposed algorithm was implemented by Atlanta Police Department in their AWARE system in 2018.
5. Early detection of COVID-19 hotspots using spatio-temporal data. [arXiv] [Slides] [Poster] [Code]
   S. Zhu, A. Bukharin, L. Xie, K. Yamin, S. Yang, P. Keskinocak, and Y. Xie.
   IEEE Journal of Selected Topics in Signal Processing. Vol. 16, Issue 2, Page 250-260, Feb 2022.
   • Finalist of Best Applied Paper Competition at 2021 INFORMS Workshop on Data Mining and Decision Analytics.
   • Best Paper Award (Honorable Mention) at ICML Time Series Workshop 2021. 
   • A short version is accepted for presentation and highlighted as contributed talk by ICML Time Series Workshop 2021.
   • Excellent Poster Award at Georgia Statistics Day 2021.
6. Imitation learning of neural spatio-temporal point processes. [arXiv] [Slides] [Poster] [Code]
   S. Zhu, S. Li, Z. Peng, and Y. Xie.
   IEEE Transactions on Knowledge and Data Engineering. Vol. 34, Issue 11, Nov 2022.
   • A short version is accepted for presentation by NeurIPS AI for Earth Sciences Workshop 2020. 
7. Spatio-temporal point processes with attention for traffic congestion event modeling. [arXiv] [Code]
   S. Zhu, R. Ding, M. Zhang, P. Van Hentenryck, and Y. Xie.
   IEEE Transactions on Intelligent Transportation Systems. Vol. 23, Issue 7, July 2022.
8. In Situ Transmission Electron Microscopy: Signal processing challenges and example. [arXiv]
   J. Kacher, Y. Xie, S. P. Voigt, S. Zhu, H. Yuchi, J. Key, and S. R. Kalidindi.
   IEEE Signal Processing Magazine (Survey paper). Vol. 39, Issue 1, Jan 2022.
9. High-resolution spatio-temporal model for county-level COVID-19 activity in the U.S. [arXiv] [Code]
   S. Zhu, A. Bukharin, L. Xie, M. Santillana, S. Yang, and Y. Xie.
   ACM Transactions on Management Information Systems. Vol. 12, Issue 4, Article 33, Dec 2021.
10. Investigating local oxidation processes in Fe thin films in a water vapor environment by in situ liquid cell TEM.
    J. Key, S. Zhu, C. M. Rouleauc, R. R. Unocic, Y. Xie, and J. Kacher.
    Ultramicroscopy. Vol. 209, Feb 2020.

Conference

1. Distributionally robust weighted k-nearest neighbors. [arXiv] [Poster] [Code] [News]
   S. Zhu, L. Xie, M. Zhang, R. Gao, and Y. Xie.
   Annual Conference on Neural Information Processing Systems (NeurIPS), 2022.
2. Neural spectral marked point processes. [arXiv] [Slides] [Poster] [Code] [News]
   S. Zhu, H. Wang, Z. Dong, X. Cheng, and Y. Xie.
   International Conference on Learning Representations (ICLR), 2022.
3. Sequential adversarial anomaly detection with deep Fourier kernel. [Slides]
   S. Zhu, H. Yuchi, M. Zhang, and Y. Xie.
   IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2021.
4. Deep Fourier kernel for self-attentive point processes. [arXiv] [Slides]
   S. Zhu, M. Zhang, R. Ding, and Y. Xie.
   International Conference on Artificial Intelligence and Statistics (AISTATS), 2021.
   • Oral presentation, acceptance rate: 48/1527 = 3.1%.
5. Goodness-of-fit test for self-exciting processes. [arXiv]
   S. Wei, S. Zhu, M. Zhang, and Y. Xie.
   International Conference on Artificial Intelligence and Statistics (AISTATS), 2021.
6. Data-driven optimization for police beat design in South Fulton, Georgia. [arXiv] [Slides]
   S. Zhu, A. Bukharin, L. Lu, H. Wang, and Y. Xie.
   KDD Workshop on Data Science for Social Good 2021. 
   • The proposed beat design was adopted by South Fulton Police Department and implemented in 2020.
7. Adversarial anomaly detection for marked spatio-temporal streaming data. [Slides] [Poster] [Code]
   S. Zhu, H. Yuchi, and Y. Xie.
   IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2020.
   • Best Student Poster Award (Honorable Mention) at Georgia Statistics Day 2019.
8. Crime event embedding with unsupervised feature selection. [arXiv] [Poster] [Code]
   S. Zhu and Y. Xie.
   IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2019.
9. Learning temporal point processes via reinforcement learning. [arXiv] [Code]
   S. Li, S. Xiao, S. Zhu, N. Du, Y. Xie, and L. Song.
   Annual Conference on Neural Information Processing Systems (NeurIPS), 2018.
   • Spotlight, acceptance rate: 168/4856 = 3.5%.
10. Crime incidents embedding using restricted Boltzmann machines. [arXiv] [Code]
    S. Zhu and Y. Xie.
    IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018.
11. Sequential adaptive detection for in-situ transmission electron microscopy (TEM). [arXiv] [Poster]
    Y. Cao, S. Zhu, Y. Xie, J. Key, J. Kacher, R. R. Unocic, and C. M. Rouleau.
    IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018.

Patent

1. Methods and systems for data analysis by text embeddings.

Y. Xie and S. Zhu. U.S. Patent No. US20190318223A1.

Thesis

1. Statistical Learning and Decision Making for Spatio-Temporal Data. 
   Ph. D. dissertation, Georgia Institute of Technology. April 2022. 

News Coverage

1. Data-driven policing
   • College of Engineering: Better AI, Better Police Force
   • Georgia Tech Smart Cities and Inclusive Innovation: Data-driven policing
   • Georgia Tech Research Horizon: Data-Driven Policing
   • Georgia Tech IPaT: Smart Data Revolution
2. Atlanta police zone design
   • AJC: Atlanta police hope changes to patrol zones shorten response times
   • Atlanta Police Department adds beats to Zone 6
   • Atlanta Police make changes to four zone boundaries as part of beat redesign
   • Atlanta Police Redraw Zone Maps and Beats
3. Police beat reconfiguration for City of South Fulton, GA
   • Fox 5: Community policing: City of South Fulton gets help from Georgia Tech to shape beats
   • City of South Fulton: Georgia Tech police beat design will help cut response times
   • Saporta Report: Community policing: City of South Fulton gets help from Georgia Tech to shape beats
   • South Fulton police adds cruisers as new beat design puts more officers on the street
   • Ga. PD adds 41 vehicles to support new beat design
4. COVID-19 Modeling
   • Model for predicting transmission of COVID-19 can help policymakers monitor virus, inform health surveillance systems
   • ML Model Uses Time, Location Data to Predict COVID-19 Transmission