To inspire, and to aspire


Jiajun Liu
Associate Professor,
Ph.D.

Renmin University of China
No. 59  Zhongguancundajie, Haidian,
Beijing, China 100872
E: jiajunliu [at] ruc [dot] edu [dot] cn                                                                                                      

Profile

My research interest extends from data management and data mining for spatio-temporal and multimedia data to distributed and high performance computing. I am currently an Associate Professor with the School of Information, Renmin University of China, working closely with Professor Ji-rong Wen. Previously I worked as a Research Fellow with the The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia. I received my PhD and BEng from The University of Queensland (supervised by Professor Heng Tao Shen and Dr. Helen Zi Huang) and from Nanjing University in 2012 and 2006 respectively. From July 2006 to December 2008 I also worked as a Researcher/Software Engineer for IBM China Research/Development Labs. 

At CSIRO, I have been working closely with Dr. Raja Jurdak and Dr. Brano Kusy, primarily on data science-oriented research, such as modeling human mobility from large-scale twitter data, or tracking/analyzing the mobility of flying-foxes, or monitoring individually-living elderlies with stream data from non-invasive wireless sensors. 

For a complete list of my publications please see my Google Scholar page.

Selected Conference Papers

  1. "Temporal Embedding in Convolutional Neural Networks for Robust Learning of Abstract Snippets", Jiajun Liu, Kun Zhao, Brano Kusy, Ji-rong Wen, Kai Zhen, Raja Jurdak, ICDE 2016 <pdf>
  2. "Multi-scale Population and Mobility Estimation with Geo-tagged Tweets", Jiajun Liu, Kun Zhao, Saeed Khan, Mark Cameron, Raja Jurdak, to appear in Big Data Analytics for Biosecurity (BioBAD), 2015 <pdf, bibtex>
  3. "Bounded Quadrant System: Error-bounded Trajectory Compression on the Go", Jiajun Liu, Kun Zhao, Shuo Shang, Philipp Sommer, Brano Kusy, Raja Jurdak, to appear in proceedings of the IEEE International Conference on Data Engineer (ICDE), 2015 <pdf, bibtex>
  4. "Interactive Top-k Spatial Keyword Queries", Kai Zheng, Han Su, Bolong Zheng, Jiajun Liu, Xiaofang Zhou, to appear in proceedings of the IEEE International Conference on Data Engineer (ICDE), 2015 <pdf>
  5. "Semi-supervised Feature Analysis for Multimedia Annotation by Mining Label Correlation", Xiaojun Chang, Haoquan Shen, Sen Wang, Jiajun Liu, Xue Li, in proceedings of the Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD) 2014:74-85 <pdf, bibtex>
  6. "Determination of Activities of Daily Living of Independent Living Older People Using Environmentally Placed Sensors", Qing Zhang, Mohanraj Karunanithi, Rajib Rana, Jiajun Liu, In Proceedings of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013:7044-7 <pdf, bibtex>
  7. "Presenting Diverse Location Views with Real-time Near-duplicate Photo Elimination", Jiajun Liu, Zi Huang, Hong Cheng, Yueguo Chen, Heng Tao Shen and Yanchun Zhang, in proceedings of the IEEE International Conference on Data Engineer (ICDE) 2013, pg.505-516 <pdf, bibtex>
  8. "Discovering Areas of Interest with Geo-tagged Images and Check-ins", Jiajun Liu, Zi Huang, Heng Tao Shen, Zhixian Yan, in proceedings of the ACM Multimedia Conference (ACM MM) 2012, pg.589-598 <pdf, bibtex>
  9. "Robust Cross-Media Transfer for Visual Event Detection", Yang Yang, Yi Yang, Zi Huang, Jiajun Liu and Zhigang Ma, in proceedings of the ACM Multimedia Conference (ACM MM) 2012, pg.1045-1048 <pdf, bibtex>
  10. "Effective Data Co-Reduction for Multimedia Similarity Search", Helen Huang, Heng Tao Shen, Jiajun Liu and Xiaofang Zhou, in proceedings of the ACM's Special Interest Group on Management Of Data Conference (SIGMOD) 2011, pg.1021-1032 <pdf, bibtex>
  11. "Efficient Histogram-based Similarity Search in Ultra-high Dimensional Space", Jiajun Liu, Zi Huang, Heng Tao Shen, Xiaofang Zhou, in proceedings of Database Systems for Advanced Applications (DASFAA) 2011, pg.1-15 <pdf, bibtex>

Selected Journal Articles

  1. "A Novel Framework for Online Amnesic Trajectory Compression in Resource-constrained Environments", Jiajun Liu, Kun Zhao, Philipp Sommer, Shuo Shang, Brano Kusy, Jae-gil Lee, Raja Jurdak, IEEE Trans. Knowl. Data Eng. (TKDE) (2016) (pdf)
  2. "Planning Unobstructed Paths in Traffic-Aware Spatial Networks", Shuo Shang, Jiajun Liu, Kai Zheng, Hua Lu, Torben Bach Pedersen and Ji-Rong Wen, GeoInformatica, 2015, 1-24
  3. "VID Join: Mapping Trajectories to Points of Interest to Support Location-Based Services", Shuo Shang, Kexin Xie, Kai Zheng, Jiajun Liu, Ji-Rong Wen, Journal of Computer Science and Technology (JCST), 2015, 30(4), 725-744
  4. "Understanding Human Mobility from Twitter", Raja Jurdak, Kun Zhao, Jiajun Liu, Maurice AbouJaoude, Mark Cameron, David Newth, PLoS ONE 2015, 10(7), e0131469 <pdf>
  5. "Optimal Levy-flight Foraging in a Finite Landscape", Kun Zhao, Raja Jurdak, Jiajun Liu, David Westcott, Brano Kusy, Hazel Parry, Philipp Sommer, Adam Mckeown, Journal of the Royal Society Interface 2015, 12(102) (JRSI) <pdfbibtex>
  6. "On the Influence Propagation of Web Videos", Jiajun Liu, Yi Yang, Zi Huang, Yang Yang, Heng Tao Shen, IEEE Transactions on Knowledge and Data Engineering (TKDE) 2014, 26(8):1961-1973 <pdf, bibtex>
  7. "Dimension Reduction with Meta Object-groups for Efficient Image Retrieval", Shuo Shang/Jiajun Liu, Mingrui Yang, Kun Zhao, Kai Zheng, Ji-Rong Wen, to appear in Neurocomputing SI:Learning Visual Semantic 2014
  8. "Local Image Tagging via Graph Regularized Joint Group Sparsity", Yang Yang, Zi Huang, Yi Yang, Jiajun Liu, Heng Tao Shen, Jiebo Luo, to appear in Pattern Recognition (PR) 2013, 46(5):1358-1368 <pdf, bibtex>
  9. "Near-duplicate Video Retrieval: Current Research and Future Trends", Jiajun Liu, Zi Huang, Heng Tao Shen, Chong Wah Ngo, and Wei Wang, to appear in ACM Computing Surveys (CSUR) 2013, 45(4):44 <pdf, bibtex>
  10. "Gram-based String Paradigm for Efficient Video Subsequence Search", Zi Huang, Jiajun Liu, Bin Cui and Xiaoyiong Du, to appear in IEEE Transactions on Multimedia (TMM) 2012, 15(3):608-620 <pdf, bibtex>
  11. "Correlation-based Retrieval for Heavily Changed Near-duplicate Videos", Jiajun Liu, Zi Huang, Heng Tao Shen and Bin Cui, in ACM Transactions on Information Systems (TOIS) 2011, 29(4):21 <pdf, bibtex>

Patents (and Applications)

  1. Macro-Block Video Stream Encoding (US) 
  2. Macro-Block Video Stream Encoding (CN) 
  3. A SIMDized Image Labeling and Fast Collection Method and System for Connected 2D Images (CN) 
  4. A Branch Free Bit Concatenation Algorithm for VLC Encoding (CN) 
  5. Position Tracking Method and Apparatus (AU) 

Honors and Awards

  • iAwards Australia 2014: Queensland Merit Award in R&D category
  • iAwards Australia 2013: Queensland Winner, National Merit Award in Community category
  • The University of Queensland Travel Grant 2012
  • Runner-up of the School of Information Technology & Electrical Engineering, the University of Queensland, 3Minute Thesis 2011
  • The University of Queensland Tuition Waiver Scholarship & UQIRTS Scholarship, 2009-2012
  • Scholarship for Special Achievements, Nanjing University, 2005
  • Dean’s Special Scholarship, Software Institute Nanjing University, 2005
  • 5th Place world-wide, Microsoft Embedded Student Challenge, 2005
  • Runner-up for Programming Competition, Software Institute Nanjing University, 2005

Reviewer

  • VLDB Journal
  • IEEE Transactions on Knowledge and Data Engineering
  • IEEE Transactions on Multimedia
  • IEEE Transactions on Big Data
  • Neurocomputing
  • Multimedia Systems
  • Entropy

PC Member

  • PAKDD 2017
  • APWeb 2016
  • ACM Multimedia 2015
  • CCF Big Data 2015

Visiting Scholar

  • École polytechnique fédérale de Lausanne,2012/2 - 2012/5, Hosting professor: Prof. Karl Aberer
  • Renmin University, China, 2014/11, Prof. Ji-rong Wen
  • Nanyang Technological University, Singapore, 2015/4, Hosting professor: A/Prof. Gao Cong
  • National University of Singapore, Singapore, 2015/4, Hosting professor: Prof. Kian-lee Tan
  • Korea Advanced Institute of Science and Technology, 2015/4, Hosting professor: A/Prof. Jae-gil Lee
  • Renmin University, China, 2015/5, Hosting professor: Prof. Ji-rong Wen