Hongkai Wen

I recently moved to the University of Warwick as an Assistant Professor.

Before that I was a post-doctoral researcher in Oxford, working with Prof. Niki Trigoni and Prof. Paul Newman to explore new ways to navigate autonomous vehicles. I am also actively involved in building robust, accurate and extremely lightweight positioning system for mobile and wearable devices. My research has won two Best Paper Awards in IPSN'14 and EWSN'13, and I co-founded the Oxford-based spin-out company Inside Tracs, which develops next-generation indoor positioning solutions. 

In 2014 I obtained my D.Phil degree in Computer Science from the University of Oxford, working in the Federated Sensor Networks (FRESNEL) project. My thesis investigates the problem of estimating the accuracy of sensor systems based on the probabilistic measurements they provide, and has been nominated to enter the 2015 BCS Distinguished Dissertations Competition. Before joining Oxford, I spent a year in Nanyang Technological University, Singapore. In 2008, I received my B.Eng in Computer Engineering and Applied Mathematics (ranked 1st) from Tongji University, P.R. China.

As always, I am driven by applying novel technologies to build practical systems that solve real-world problems. Please feel free to contact me for any interesting opportunity.

• On Assessing the Accuracy of Indoor Positioning Systems.
  Hongkai Wen, Zhuoling Xiao, Andrew Markham and Niki Trigoni. 
  In Proceedings of the 10th European conference on Wireless Sensor Networks (EWSN'13), pp. 1-17. Springer-Verlag, 2013. ( Best Paper Award, 1 in 51 submissions )

• Lightweight map matching for indoor localization using conditional random fields.
  Zhuoling Xiao, Hongkai Wen, Andrew Markham and Niki Trigoni. 
  In Proceedings of the 13th International Conference on Information Processing in Sensor Networks (IPSN'14), pp. 131-142. IEEE/ACM, 2014. ( Best Paper Award, 2 in 111 submissions )
• Accurate Positioning via Cross-Modality Training.
  Savvas Papaioannou, Hongkai Wen, Zhuoling Xiao, Andrew Markham and Niki Trigoni.
  In Proceedings of the 13th ACM Conference on Embedded Networked Sensor Systems (SenSys'15), pp. 239-251. ACM, 2015. (acceptance rate: 20%) 
• Opportunistic Radio Assisted Navigation for Autonomous Ground Vehicles. 
  Hongkai Wen, Yiran Shen, Savvas Papaioannou, Winston Churchill, Niki Trigoni and Paul Newman.
  In Proceedings of the 11th International Conference on Distributed Computing in Sensor Systems (DCOSS'15), pp. 21-30. IEEE, 2015. (acceptance rate: 23%) 
• Accuracy Estimation for Sensor Systems.
  Hongkai Wen, Zhuoling Xiao, Andrew Markham and Niki Trigoni.
  IEEE Transactions on Mobile Computing (TMC) 14(7): 1330-1343, 2015. (impact factor: 2.912) 
• Robust Indoor Positioning with Lifelong Learning.
  Zhuoling Xiao, Hongkai Wen , Andrew Markham and Niki Trigoni.
  IEEE Journal on Selected Areas in Communications (JSAC) 33(11): 2287-2301, 2015. (impact factor: 4.138) 
• Indoor Tracking Using Undirected Graphical Models.
  Zhuoling Xiao, Hongkai Wen, Andrew Markham and Niki Trigoni.
  IEEE Transactions on Mobile Computing (TMC) 14(11): 2286-2301, 2015. (impact factor: 2.912) 
• Non-Line-of-Sight Identification and Mitigation Using Received Signal Strength.
  Zhuoling Xiao, Hongkai Wen, Andrew Markham, Niki Trigoni, Phil Blunsom and Jeff Frolik.
  IEEE Transactions on Wireless Communications (TWC) 14(3): 1689-1702, 2015. (impact factor: 2.762) 

• Robust Pedestrian Dead Reckoning (R-PDR) for Arbitrary Mobile Device Placement.
  Zhuoling Xiao, Hongkai Wen, Andrew Markham and Niki Trigoni. 
  In Proceedings of the 2014 International Conference on Indoor Positioning and Indoor Navigation (IPIN'14), pp. 187-196. IEEE, 2014.

• Fusion of Radio and Camera Sensor Data for Accurate Indoor Positioning.
  Savvas Papaioannou, Hongkai Wen, Andrew Markham and Niki Trigoni. 
  In Proceedings of the 11th IEEE International Conference on Mobile Ad Hoc and Sensor Systems (MASS'14), pp. 109-117. IEEE, 2014. (acceptance rate: 26%) 

• Comparison of Accuracy Estimation Approaches for Sensor Networks.
  Hongkai Wen, Zhuoling Xiao, Andrew Symington, Andrew Markham and Niki Trigoni.
  In Proceedings of the 9th International Conference on Distributed Computing in Sensor Systems (DCOSS'13), pp. 28-35. IEEE, 2013. (acceptance rate: 21%) 

• Identification and Mitigation of Non-line-of-sight Conditions Using Received Signal Strength.
  Zhuoling Xiao, Hongkai Wen, Andrew Markham, Niki Trigoni, Phil Blunsom and Jeff Frolik.
  In Proceedings of the 9th IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob'13), pp. 667-674. IEEE, 2013. 

• Ranking Query Answers in Probabilistic Databases: Complexity and Efficient Algorithms.
  Dan Olteanu and Hongkai Wen (alphabetical order).
  In Proceedings of the 28th International Conference on Data Engineering (ICDE'12), pp. 282-293. IEEE, 2012. (acceptance rate: 17%) 

• Operational Transformation for Orthogonal Conflict Resolution in Real-time Collaborative 2D Editing Systems.
  Chengzheng Sun, Hongkai Wen and Hongfei Fan.
  In Proceedings of the 2012 ACM Conference on Computer Supported Cooperative Work (CSCW'12), pp. 1391-1400. ACM 2012.