Projects per year
Personal profile
Personal profile
Dr. Keqin (Kevin) Liu (刘克勤) received his Ph.D. degree from the University of California at Davis in 2010 and joined industry as a software engineer in 2012 after 2 years of postdoc experience. After 8 years of working in the Silicon Valley, Dr. Liu still has a lot passion in mathematics and decided to return to academia in 2020 when working in ASML and subsequently taught in Nanjing University until joining XJTLU in 2024.
Research interests
Dr. Liu’s research interests include the development of modern math theory for AI technologies, the extension of pure math theory, especially number theory, and the application of pure math theory to solving practical problems in machine learning, e.g., multi-armed bandit in reinforcement learning.
Experience
Associate Professor, School of Math. & Phys., XJTLU, China (2024.08-now)
Lecturer, Math. Dept. & NJ-Helsinki Inst., NJU, China (2020.11-2024.07)
Sr. Software Engineer, ASML, Silicon Valley, USA (2019.02-2020.10)
Staff Software Engineer, KLA, Silicon Valley, USA (2016.03-2019.01)
CTO, Startup (Social E-Commerce), Silicon Valley, USA (2015.07-2016.03)
Sr. Software Engineer, MOOG, Silicon Valley, USA (2012.09-2015.07)
Postdoctoral Scholar and Lecturer, UC-Davis, USA (2010.10-2012.09)
Teaching
Fall 25/26:
MTH219: Complex Functions
MTH301: Final Year Project (Bachelor)
MTH446: Dissertation (Master)
Spring 24/25:
MTH302: Applied Probability
MTH301: Final Year Project (Bachelor)
Fall 24/25:
MTH205: Introduction to Statistical Methods
MTH301: Final Year Project (Bachelor)
Spring 23/24 (NJU):
Calculus II
Linear Algebra
Machine Learning: Mathematical Theory and Applications
Light of Science: AI and Mathematics
Light of Science: Human Civilization and Technology Development Boosted by Mathematics
Fall 23/24 (NJU):
Calculus I
Probability Theory and Statistics (2 parallel classes)
Spring 22/23 (NJU):
Machine Learning: Mathematical Theory and Applications
Light of Science: Human Civilization and Technology Development Boosted by Mathematics
Fall 22/23 (NJU):
Calculus I
Spring 21/22 (NJU):
Machine Learning: Mathematical Theory and Applications
Light of Science: Human Civilization and Technology Development Boosted by Mathematics
Operations Research
Fall 21/22 (NJU):
Probability Theory and Statistics
Spring 20/21 (NJU):
Stochastic Optimization
Summer 2011 (UC-Davis):
EEC150A: Signals and Systems I
Awards and honours
2024 SIP International Leading Talent (400,000 RMB fund), Suzhou, China, Jan. 6, 2025.
2024 First Prize for Excellent Paper Award, JAAS Annual Academic Conference, Nanjing, China, September 20-22, 2024.
2023 Zhi-Jian Award for Excellence in Teaching (mathematics), NJU, China
2021 Zi-Jin Talent Award (800,000 RMB fund), NJU, China
2021 Zheng-Gang Talent Award (300,000 RMB fund), NJU, China
2012 Zuhair A. Munir Award for Best Doctoral Dissertation, College of Engineering (selected from all the 7 departments), UC-Davis, USA
2011 Alien of Extraordinary Ability, USCIS, USA
External positions
Council Member, Chinese Association for Applied Statistics - Digital Twin and Uncertainty Quantification
Oct 2025 → Oct 2029
Chief Scientist, Shanghai Aquarian Century Artificial Intelligence Technology Co., Ltd.
Aug 2025 → Jul 2030
Council Member, Jiangsu Association for Applied Statistics
Jul 2022 → Jul 2026
Research Fellow, Jiangsu National Center for Applied Mathematics
Nov 2020 → Aug 2025
Research areas
- Reinforcement Learning
- Number Theory
Person Types
- Staff
Fingerprint
Dive into the research topics where Keqin Liu is active. These topic labels come from the works of this person. Together they form a unique fingerprint.
- 1 Similar Profiles
Collaborations and top research areas from the last five years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
-
High-Dimensional Reinforcement Learning: Mathematical Theory and Applications
Liu, K. (PI)
1/01/25 → 31/12/26
Project: Governmental Research Project
-
Study on Single-Loop Full Splitting Algorithms for Nonconvex, Nonsmooth Optimization with Multiple Composite Structures
Tao, M. (PI) & Liu, K. (Team member)
1/01/25 → 31/12/28
Project: Governmental Research Project
-
High-Dimensional Reinforcement Learning by Multi-Armed Bandit
Liu, K. (PI)
1/01/25 → 31/12/27
Project: Internal Research Project
-
-
-
Approximated Whittle index for femtocell scheduling
Zhang, Y. & Liu, K., 2 Jul 2025, Computational Mathematics and Numerical Analysis, CSAMCS 2023. Dai, W. & Li, J. (eds.). Springer, p. 337-346 10 p. (Springer Proceedings in Mathematics and Statistics; vol. 486).Research output: Chapter in Book or Report/Conference proceeding › Conference Proceeding › peer-review
-
Generalization and alternative proof of two identities posed by Sun
Liu, K., 6 Oct 2025, In: Linear and Multilinear Algebra.Research output: Contribution to journal › Article › peer-review
-
Relaxed indexability and index policy for partially observable restless bandits
Liu, K., 16 Apr 2025, In: Management Science.Research output: Contribution to journal › Article › peer-review
-
Equilibrium condition-based optimization models for network-wide travel time estimation using limited observed data
Cao, S., Lam, W. H. K., Liu, K., Shao, H., Tam, M. L. & Wu, T., 31 Jan 2024, In: Transportmetrica A: Transport Science. 21, 3, 2304033.Research output: Contribution to journal › Article › peer-review
4 Citations (Scopus) -
Low-complexity algorithm for restless bandits with imperfect observations
Liu, K., Weber, R. & Zhang, C., 5 Sept 2024, In: Mathematical Methods of Operations Research. 100, 2, p. 467-508 42 p.Research output: Contribution to journal › Article › peer-review
2 Citations (Scopus)
Activities
-
High-Dimensional Reinforcement Learning by Multi-Armed Bandits
Keqin Liu (Speaker)
25 Oct 2025Activity: Talk or presentation › Invited talk
-
University of California at Davis
Keqin Liu (Visiting researcher)
12 Jul 2025 → 26 Jul 2025Activity: Research visit
-
Guideline Drafting for Sino-Russian Mathematical Challenge Fund
Keqin Liu (Participant)
27 Jun 2025Activity: Participating in or organising an event › Participating in an event e.g. a conference, workshop, …
-
Beijing Normal University
Keqin Liu (Visiting researcher)
16 May 2025 → 19 May 2025Activity: Research visit
-
2025 AI+ Research Forum at XJTLU
Keqin Liu (Participant)
2 Apr 2025Activity: Participating in or organising an event › Participating in an event e.g. a conference, workshop, …