Ziyi Liu

About

I am a Professor at Soochow University. From December 2023 to December 2025, I was a Research Assistant Professor in the Department of Computer Science and Engineering at the Hong Kong University of Science and Technology. I received my Ph.D. from the University of Queensland in 2023. My research focuses on spatiotemporal data intelligence, with applications in urban transportation, digital twins, and embodied AI. I have served as a reviewer and program committee member for multiple top-tier international journals and conferences in databases and artificial intelligence.

Spatial intelligence Spatiotemporal data management Graph algorithms Machine learning

Selected publications

* corresponding author.

• A Universal Scheme for Partitioned Dynamic Shortest Path Index

  Mengxuan Zhang, Xinjie Zhou, Lei Li, Ziyi Liu, Goce Trajcevski, Yan Huang, Xiaofang Zhou

  TKDE, 2026

• Hypergraph-Structured Variational Inference for Next-Basket Recommendation

  Wen Yang, Ziyi Liu*, Rui Zhou, Lu Chen, Jiaxin Li, Chengfei Liu, Jiajie Xu

  TKDE, 2026 DOI

• ReEx-SQL: Reasoning with Execution-Aware Reinforcement Learning for Text-to-SQL

  Yaxun Dai, Wenxuan Xie, Xialie Zhuang, Tianyu Yang, Ziyi Liu*, Haiqin Yang, Yiying Yang, Yuhang Zhao, Pingfu Chao, Wenhao Jiang

  ACL, 2026 Paper DOI

• TIV: Thought Injection via Vectors for Efficient Reasoning in Large Reasoning Models

  Yi Cao, Weijie Shi, Wei-Jie Xu, Yucheng Shen, Yue Cui, Hanghui Guo, Shimin Di, Ziyi Liu*, Jiaming Li, Alexander Zhou, Jia Zhu, Jiajie Xu

  AAAI, 2026 Paper DOI

• Active Multi-source Domain Adaptation for Multimodal Fake News Detection

  Yanping Chen, Weijie Shi, Mengze Li, Yue Cui, Jiaming Li, Ruiyuan Zhang, Hao Chen, Hanghui Guo, Shimin Di, Ziyi Liu, Jia Zhu, Jiajie Xu

  AAAI, 2026 Paper DOI

• SSR3D-LLM: Structured Spatial Reasoning via Latent Steps for Fine-Grained Grounding in Unified 3D-LLMs

  Jiawei Li, Ziyi Liu*, Weijie Shi, Long Chen, Jiajie Xu, Xiaofang Zhou

  arXiv, 2026 arXiv

• Head-wise Modality Specialization within MLLMs for Robust Fake News Detection under Missing Modality

  Kai Qian, Weijie Shi, Jiaqi Wang, Mengze Li, Hao Chen, Yue Cui, Hanghui Guo, Ziyi Liu, Jia Zhu, Jiajie Xu

  arXiv, 2026 arXiv

• Efficient Time-Dependent Shortest Path Finding on Cargo Network

  Elton Chun-Chai Li, Ziyi Liu*, Ruiyuan Zhang, Sean Shing-Fung Lau, Yehong Xu, Xiaofang Zhou

  IEEE BigData, 2025 DOI

• Approximate Skyline Index for Constrained Shortest Pathfinding with Theoretical Guarantee

  Ziyi Liu, Lei Li, Mengxuan Zhang, Wen Hua, Xiaofang Zhou

  ICDE, 2024 DOI

• Ranking Region-Based OD-Betweenness Centrality in Road Networks

  Zhixiao Zheng, Lei Li, Mengxuan Zhang, Wen Hua, Ziyi Liu

  ICONIP, 2024 DOI

• FHL-Cube: Multi-Constraint Shortest Path Querying with Flexible Combination of Constraints

  Ziyi Liu, Lei Li, Mengxuan Zhang, Wen Hua, Xiaofang Zhou

  PVLDB, 2022 PDF DOI

• Multi-Constraint Shortest Path Using Forest Hop Labeling

  Ziyi Liu, Lei Li, Mengxuan Zhang, Wen Hua, Xiaofang Zhou

  VLDB Journal, 2023 DOI arXiv

• Efficient Constrained Shortest Path Query Answering with Forest Hop Labeling

  Ziyi Liu, Lei Li, Mengxuan Zhang, Wen Hua, Pingfu Chao, Xiaofang Zhou

  ICDE, 2021 DOI

• An Experimental Study on Exact Multi-constraint Shortest Path Finding

  Xuanyi Zhang, Ziyi Liu, Mengxuan Zhang, Lei Li

  ADC, 2021 · Best Student Paper · co-first author DOI

• Analysing Online Platform Users’ Attitudes Toward Internet of Things

  Ziyi Liu, Meng Zhang

  PACIS, 2018 Paper

Grants

• National Major Engineering Supporting Research, Hanjiang-to-Weihe Water Diversion construction-period special project: Key Technologies for TBM Tunnel Advance Geological Prediction and Surrounding-Rock Risk Classification

  Co-PI · RMB 4.25 million

• NSFC Young Scientists Fund: Spatiotemporal Semantic Query Optimization for Industrial Embodied Scenarios

  PI · 2027 – 2029 · RMB 300,000

• Soochow University Distinguished Professor (Elite Talent) start-up fund

  PI · RMB 1 million

• Huawei: Adaptive nearest-neighbor query over high-density point clouds in dynamic environments

  PI · 2024 – 2027 · RMB 1 million

• Huawei: Partitioned indexing and querying of discrete spatiotemporal data

  PI · 2023 – 2024 · RMB 1.391 million

Teaching

• Introduction to Spatial Databases

  Soochow University · Spring 2026

• Advanced Spatiotemporal Indexing and Query Processing

  HKUST · Fall 2025

• Database Management Systems

  HKUST · Fall 2024

• Relational Database Systems

  The University of Queensland · Fall 2022

• Advanced Techniques for High Dimensional Data

  The University of Queensland · Spring 2020, Spring 2021

Students