Junjie Chen   Postdoc National University of Singapore Email: junjchen9-c at my dot cityu dot edu dot hk

Biography

I am a Postdoc Fellow (Sept 2025 ~) and was a research assistant (Dec 2024 ~ March 2025) at Economics Department, National University of Singapore, hosted by Prof. Yingkai Li.

I was a Postdoc at Kyushu University (April ~ July, 2025), hosted by Prof. Makoto Yokoo.

I obtained my PhD degree from the Department of Computer Science, City University of Hong Kong in Feb 2025, supervised by Prof. Minming Li. I was a visiting student at OSIPP at Osaka University from Sept 2023 to Aug 2024, advised by Prof. Takuro Yamashita. In Nov 2019, I received my M.Phil. degree from Department of Computer Science, Hong Kong Baptist University, supervised by Prof. William K. Cheung.

Interests

My research is situated at the interface between economics and computer science, especially focusing on information design (e.g., information/data pricing, signaling) and contract design.

Research

• Fair Contracts, (working paper, arXiv)
  (alpha-beta) Matteo Castiglioni, Junjie Chen and Yingkai Li
  
• The Design of Monopoly Information Broker, (working paper, arXiv)
  (alpha-beta) Junjie Chen and Takuro Yamashita
  
• Multi-Project Contracts, (EC), 2025
  (alpha-beta) Tal Alon, Matteo Castiglioni, Junjie Chen, Tomer Ezra, Yingkai Li and Inbal Talgam-Cohen
  
• Hiring for An Uncertain Task: Joint Design of Information and Contracts, (SODA), 2025
  (alpha-beta) Matteo Castiglioni and Junjie Chen
  
• A Reduction from Multi-Parameter to Single-Parameter Bayesian Contract Design, (SODA), 2025
  (alpha-beta) Matteo Castiglioni, Junjie Chen, Minming Li, Haifeng Xu and Song Zuo
  
• Bayesian Calibrated Click-through Auction, (ICALP), 2024
  (alpha-beta) Junjie Chen, Minming Li, Haifeng Xu and Song Zuo
  
• Selling Data To a Machine Learner: Pricing via Costly Signaling, (ICML), 2022
  (alpha-beta) Junjie Chen, Minming Li and Haifeng Xu
  
• Chance-Constrained Submodular Knapsack Problem, (COCOON), 2019
  (alpha-beta) Junjie Chen and Takanori Maehara
  
• Similarity Preserving Deep Asymmetric Quantization for Image Retrieval, (AAAI), 2019
  Junjie Chen and William Cheung
  
• Learning Deep Unsupervised Binary Codes for Image Retrieval, (IJCAI), 2018
  Junjie Chen, William Cheung and Anran Wang
  
• APhash: Anchor-based Probability Hashing for Image Retrieval, (ICASSP), 2018
  Junjie Chen, Anran Wang and William Cheung
  
• DDSH: Deep Distribution-Separating Hashing for Image Retrieval, (PCM, now MM Asia), 2017
  Junjie Chen and Anran Wang
  

Internship

• Tencent AI Lab, Shenzhen, China
  Research Intern from June to Sept, 2019
  
• RIKEN Center for Advanced Intelligence Project (AIP), Tokyo, Japan
  Research Intern from Sept to Dec, 2018