I am an assistant professor in the Department of Computer Science at Aalborg University Copenhagen (AAU CPH). I am in the Data Engineering, Science and Systems (DESS) group headed by Prof. Christian S. Jensen. I obtained the Ph.D. degree from Aalborg University (Department of Computer Science) in 2022, advised by Prof. Hua Lu. I worked on Queries for Indoor Location-based Services (LBSs) during my PhD study. My current work focuses on data analysis related to moving-object mobility. My research generally concerns graph search, spatial database, data management, and data science.

Selected Recent Publications

• J. Li, T. Liu, H. Lu: CLEAR: Ranked Multi-Positive Contrastive Representation Learning for Robust Trajectory Similarity Computation. MDM 2024. (Best Paper Runner-up Award)
• T. Liu, H. Li, H. Lu, M. A. Cheema, and H. K. Chan. Contact Tracing over Uncertain Indoor Positioning Data. (Accepted by TKDE, 2023) (CCF A)
• T. Liu, Z. Feng, H. Li, H. Lu, L. Shou, and J. Xu. IKAROS: An Indoor Keyword-Aware Routing System. ICDE, 2022: 3182-3185. (Demo Paper). (CCF A)
• T. Liu, Z. Feng, H. Li, H. Lu, M. A. Cheema, H. Cheng, and J. Xu. Towards Indoor Temporal-variation aware Shortest Path Query. TKDE, 35(1): 998-1012 (2023). (CCF A)
• T. Liu, H. Li, H. Lu, M. A. Cheema, and L. Shou. Towards Crowd-aware Indoor Path Planning. PVLDB, 2021: 1365-1377. (CCF A)
• H. K. Chan, T. Liu, H. Li, and H. Lu. Time-Constrained Indoor Keyword-aware Routing. SSTD, 2021: 74-84. (Best Research Paper Nomination)
• T. Liu, H. Li, H. Lu, M. A. Cheema, and L. Shou. Indoor Spatial Queries: Modeling, Indexing, and Processing. EDBT, 2021: 181-192. (CCF B)
• T. Liu, Z. Feng, H. Li, H. Lu, M. A. Cheema, H. Cheng, and J. Xu. Shortest Path Queries for Indoor Venues with Temporal Variations. ICDE, 2020: 2014-2017. (CCF A)
• Z. Feng, T. Liu, H. Li, H. Lu, and L. Shou, J. Xu. Indoor Top-k Keyword-aware Routing Query. ICDE, 2020: 1213-1224. (CCF A)

Teaching

• Lecturer for Course Database System (Bachelor Level), Aalborg University (CPH Campus), 2024 Fall.
• Co-lecturer for Course Mobile Data and Location-based Services (Master Level), Aalborg University (CPH Campus), 2024 Spring.
• Semester coordinator for SW6, Aalborg University (CPH Campus), 2024 Spring.
• Supervisor for SW6, SW8, Aalborg University (CPH Campus), 2024 Spring.
• Teaching assistant for Database System, Aalborg University (CPH Campus), 2023 Fall.
• Teaching assistant for Database Development, Aalborg University, 2019-2020.
• Supervisor for SW3, SW6, SW7 and BaIT4 groups, Aalborg University, 2019-2020.

Awards/Honors

• Supervisor of the Year Award Nomination, Computer Science at AAU, 2024
• Best Paper Runner-up Award, IEEE MDM, 2024
• Best Research Paper Nomination, SSTD, 2021

Project

• Horizon European Framework Program (HORIZON), MobiSpaces: New Data Spaces for Green Mobility.(Main Participant)
• Data Management Foundations for Indoor LBS (Main Participant)

Professional Services

Program Committee Member

• 2024: MDM, SIGSPATIAL
• 2022: AAAI

Journal/Conference External Reviewer

• 2024: ICDE, VLDB, CIKM, SIGSPATIAL
• 2023: ICDE, SIGSPATIAL
• 2022: SIGKDD, SIGKDD, SIGSPATIAL, BigData, WISE
• 2021: TKED, VLDB, SIGKDD, SIGSPATIAL
• 2020: ICDE, KDD, SIGSPATIAL, CIKM, MDM, DASFAA, IEEE BigData, TheWebConf
• 2019: KDD, CIKM, SIGSPATIAL

Acknowledgements

Tiantian would like to thank all her co-authors for their guide and inspiration.

• Christian S. Jensen
• Harry Kai-Ho Chan
• Hengyu Liu
• Hong Cheng
• Hua Lu
• Huan Li
• Jialiang Li
• Jianliang Xu
• Kristian Torp
• Lidan Shou
• Muhammad Aamir Cheema
• Tianyi Li
• Xiao Li
• Zijin Feng

Contact

• Email: liutt@cs.aau.dk
• Office: A.C. Meyers Vænge 15, Room 2.2.090, Copenhagen, Denmark