Professor Weiru Liu

Chair of Artificial Intelligence

Director of Research: Knowledge and Data Engineering Cluster

PhD (Edinburgh Univ.)
BSc, MSc (both Jilin Univ.)
Email: w.liu(at)qub(dot)ac(dot)uk
Tel: +44 (0)28 9097 4896







Publications | Projects | Professional Activities | Brief CV


  • Research Interests
  • 1. Theories of Reasoning under Uncertainty, Uncertain Information Fusion, Multi-criteria Decision Making under Uncertainty:
    This research is concerned with modelling, reasoning, and merging uncertain information from heterogeneous sources in any intelligent systems (e.g., large sensor networks). We particularly focus on the Dempster-Shafer theory of Evidence (belief function theory), possibility theory and possibilistic logic, and probability theory. We research into the appropriateness of modelling uncertain information using these formalisms, aggregation approaches offered by them, and conflict/inconsistency analysis among multiple piece of uncertain information within these theories. Recent work has advanced to handling ambiguous evidence in game theory for security and multi-criteria decision making under uncertainty in complex systems.

    2. Theoretical aspects of Merging/Revising Uncertain and Inconsistent Knowledgebases:
    Our research includes developing fusion methods (merging operators) and algorithms for merging multiple knowledgebases (maybe with constrains), especially, propositional and possibilistic knowledgebases, stratified knowledgebases, imprecise probabilistic logic based knowledge bases, and heterogeneous uncertain information. We also develop revision strategies/operators for revising such knowledge/belief bases. Recent research has progressed to providing a toolkit for identifying minimal inconsistent subsets and calculating inconsistency values of knowledgbases or individual formulae in large scale knowledge bases. This research has also been extended to developing approaches for detecting inconsistencies in probabilistic knowledge bases (learned by other machine learning systems) and repairing such inconsistencies.

    3. Data mining, large scale data analytics, anomaly/threats detection
    Knowledge acquisition is expensive and often there is no expert around from whom to elicit the knowledge. We study Machine Learning and Data Mining techniques to discover knowledge from data that are easily comprehensible to humans.

    Our earliest work was on developing algorithms for constructing Bayesian Networks from data. Recent works in this area are strongly influenced by emerging real-world applications, including:
  • Design and develop anomaly detection algorithms for detecting abnormal behaviors (anomalies) in physical access control environment under the context of security within CSIT; develop graph-theory based algorithms for identifying exercise patterns and influences among participants in events; and discover social connection patterns from social networks.
  • Design and develop various data analytical approaches, in collaboration with Belfast City Council, for analyzing data on Pollution, Waste disposal/treatment, Recycling; Anti-Social Behaviors, etc.
  • Design and develop real-time threats and anomaly prediction algorithms with missing values in datasets, using knowledge discovered above, to provide real-time situation awareness for decision support.
  • 4. Intelligent Autonomous Systems and Event-reasoning based Situation Awareness:
    Our research on theoretical research in uncertain information modelling and fusion, and knowledge evolution and inconsistency handling have enabled us to:
  • Design and develop a multi-agent based event reasoning framework for correlating dispersed events detected from heterogeneous sources in a distributed complex environment for achieving situation awareness. Applications include intelligent surveillance in cyber-physical systems, smart homes, and intelligent energy and transport management in smart cities.
  • Design and develop intelligent autonomous systems using multi-agent techniques for complex control problems and for designing collaborative (software) agents, or mixed teams of multi-robots and human for working together in complex environment. Applications include search and rescue, services, complex industrial control problems, and games for entertainment or education.
  • Paper Analyzing the degree of conflict among belief functions or click here for a copy (by Weiru Liu) was ranked the 6th among the Top 10 Cited articles published between 2006 to 2011 in the Artificial Intelligence Journal.

  • Current Main Projects (full list see Projects)
  • (NEW) LNiK: Northern Ireland Administrative Data Research Centre (ESRC: Ref ES/L007509/1, 2014-2019), Co-I.
  • (NEW) PAuSE: Personalising Autonomous Systems (MoD/DSTL 2014) Co-I.
  • (NEW) WAVeTrack: Graph-based Trajectory Mining for Knowledge Discovery of Vehicular Movements (MoD/DSTL 2014) Co-I.
  • PACES Providing Autonomous Capabilities for Evolving SCADA (EPSRC 2012-2015), PI
  • ARIES Accelerated Real-Time Information Extraction System (EPSRC 2012-2013), Co-I
  • TEI@I Framework for Forecasting and Decision Making (The Royal Academy of Engineering 2012-2013), PI
    (In collaboration with Prof Gang Xie and Prof Xiaoguang Yang at Chinese Academy of Sciences, China)
  • Queen's (EPSRC) Impact Award: 2011, PI
  • Reasoning with Uncertainty and Inconsistency in Structured Scientific Knowledge (EPSRC 2007-2010), PI
  • Approaches to Merging/Revising Prioritized knowledge and their Applications to Multiple Viewpoints based Requirements Engineering (Royal Society and Chinese Academy of Sciences 2009-2011), Co-PI
  • CSIT: Centre for Secure Information Technologies (EPSRC 2009-2014), Co-I
  • CSIT: Centre for Secure Information Technologies (EPSRC 2010-2014), Co-I
  • Some current/recent professional activities (full list from Professional Activities)
  • Member of EPSRC College 2006--
  • Journal Guest Editorship:
  • Weiru Liu and Henri Prade (Guest Editors): Special Issue of Fuzzy Sets and Systems 2013.
  • Weiru Liu (Guest Editor): Special Issue of International Journal of Approximate Reasoning, 2013.
  • Conference Chairs/Steering Committee member:
  • Program Co-Chair of the 7th International Conference on Scalable Uncertainty Management (SUM'13), 16-18 September, 2013. Washington DC Area, USA.
  • Conference/Program Chair of the Eleventh European Conference on Symbolic and Quantitative Approaches to Reasoning under Uncertainty (ECSQARU'11). June 29the - July 1st, 2011. Belfast, Northern Ireland, UK.
  • Member of the Ecsqaru Permanent Committee (ecsqaru.org)
  • Member of the Steering Committee of Belief Functions Series (BELIEF)
  • Invited talks:
  • Invited Speaker at the Second Belief Functions and Applications Society Spring School (BFAS), 20th - 24th May, 2013. Carthage, Tunisia.
  • Invited keynote Speaker at the Tenth Mexican International Conference on Artificial Intelligence, November 26th - December 4th, 2011. Puebla, Mexico.
  • Conference PC members (some conferences in 2013 - 2015, full list is available from Professional Activities):
  • AAAI'15, KR'14, FoIKS'14, UR'14, ECAI'14, UAI'14 IJCAI2013 (SPC), UAI'13, ECSQARU'13, UR'13, AI&Cyber Security, WL4AI'13.