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Quan Long

Consultant​

Research Interests

Introduction
I obtained my PhD in computational structural mechanics from CSMLab at Cambridge University, where my research focused on isogeometric analysis using subdivision techniques and its applications in large structural deformations, nematic elastomers and dynamic fractures. During my postdoctoral research, I have extended my interests from deterministic problems to stochastic problems, for example, Bayesian experimental design, sparse quadratures for stochastic pdes and Bayesian model validation. My recent work on fast optimal experimental design has been focused on using Laplace approximation, sparse quadratures and multi level methods to accelerate the computation of the information theoretic utility function, the so-called expected information gain, for experiments associated with large scale PDEs. The new methodology can significantly improve the computational efficiency, which is the major factor hindering the application of Bayesian optimal experimental design in engineering. I have applied the cost-efficient method to the design of current patterns in impedance tomography, the sensor placements for seismic source inversion, the design of optimal initial temperature and fuel concentration in combustion experiments, and the detectability of transverse cracks in laminated composites.
 
Research Interests
  • Uncertainty quantification
  • Bayesian experimental design
  • Model validation
  • Stochastic modelling for subsurface flow
  • NURBS and subdivision based isogeometric analysis
  • Numerical methods for thin structures
 

Selected Publications

Journal Publications and Book Chapters:
  • L. Selvakumaran, Q. Long, S. Prudhomme and G. Lubineau. On the detectability of transverse cracks in laminated composites using electrical potential change measurements​. Composite Structures.  Accepted by Composite Structures, 2014.
  • Q. Long, M. Motamed, R. Tempone. Fast Bayesian optimal experimental design for seismic source inversion.​  Computer Methods in Applied Mechanics and Engineering, vol. 291, pp. 123-145, 2015. ​
  • Q. Long, M. Scavino, R. Tempone and S. Wang. A Laplace method for under-determined Bayesian optimal experimental design. Computer Methods in Applied Mechanics and Engineering. Accepted for publication, 2014.
  • F. Cirak, Q. Long, K. Bhattacharya and M. Warner. Computational analysis of liquid crystalline elastomer membranes: changing Gaussian curvature without stretch energy. International Journal of Solids and Structures. 2014; 51 (1): 144-153.
  • Q. Long, M. Scavino, R. Tempone and S. Wang. Fast Estimation of Expected Information Gains for Bayesian Experimental Designs Based on Laplace Approximations. Computer Methods in Applied Mechanics and Engineering. 2013; 259:24-39.
  • Q. Long and P. B. Bornemann and F. Cirak. Shear-flexible subdivision shells. International Journal for Numerical Methods in Engineering, 90(13), 1549:1577, 2012.
  • F. Cirak and Q. Long. Subdivision shells with exact boundary control and non-manifold geometry. International Journal for Numerical Methods in Engineering, 88(9), 897:923, 2011.
  • F. Cirak and Q. Long. Advances in subdivision finite element for thin shells. In New Trends in Thin Structures: Formulation, Optimization and Coupled Problems, 1st Edition, CISM Courses and Lectures, Volume 519, Springer, New York, 2010.
  • C. S. Hou, J. Li and Q. Long. Cubic spline solutions of nonlinear bending and buckling of circular plates with variable thickness. Transactions of Tianjin University, 9(4), 321-325, 2003

Conference Publications:

  • Q. Long, M. Scavino, R. Tempone and S. Wang. Fast evaluation of expected information gain for Bayesian experimental design based on Laplace approximation. 6th European Congress on Computational Methods in Applied Sciences and Engineering, Sep. 10-14, 2012, Vienna, Austria.
  • Q. Long, S. Prudhomme, M. Scavino, R. Tempone and S. Wang. Optimal design of model validation procedure with respect to quantity of interest. Stochasitc Modeling Techniques and Data Analysis International Conference, Jun. 5-8, 2012, Chania, Crete, Greece.
  • Q. Long, S. Prudhomme and R. Tempone. Information gain in the model validation for porous media. IMA Annual Program Year Workshop: Large-scale Inverse Problems and Quantification of Uncertainty, Jun. 6-10, 2011, Mineapolis, MN, USA.
  • R. A. Kuche, Q. Long, F. Cirak, H. B. Coda. Immersed B-spline finite elements for complex domains. 10th US National Congress of Computational Mechanics, Jul. 16-19, 2009, Ohio, USA.
  • R. A. Kuche, Q. Long and F. Cirak. Immersed B-spline finite elements for complex domains. 13th Mathematics of Finite Elements and Applications, Jun. 9-12, 2009, London, UK.
  • Q. Long and F. Cirak. Subdivision shells for nonsmooth and branching geometries. 17th UK National Conference on Computational Mechanics in Engineering, Apr. 6-8, 2009, Nottingham, UK.
  • Q. Long and F. Cirak, A unified discretization approach for shear-rigid and shear-deformable shells. 8th World Congress of Computational Mechanics, Jun. 30-Jul. 5, 2008, Venice, Italy. (Keynote Lecture)
  • Q. Long and F. Cirak. Subdivision thin shell finite element on non-smooth geometry. The 6th International Conference on Computation of Shell and Spatial Structures, May 28-31, 2008, Ithaca, New York, USA.
  • C. G. Koh, H. J. Goh and Q. Long. Hybrid structural identification strategy suitable for distributed computing. The 2nd International Conference on Structural Health Monitoring of Intelligent Infrastructures, Nov. 16-18, 2005, Shenzhen, China.
  • C. G. Koh and Q. Long. A genetic algorithm based strategy for parameter identification of large systems. The 17th KKCNN Symposium on Civil Engineering, Dec. 13-15, 2004, Thailand.


Education Profile

  • 2005-2010 Doctorate, Department of Engineering, University of Cambridge, UK
  • 2003-2005 MEng, Department of Civil Engineering, National University of Singapore, Singapore
  • 1999-2003 BEng, Department of Civil Engineering, Tianjin University, China

Professional Profile

  • Joint postdoctoral researcher at (ICES), UT Austin and KAUST, since Nov. 2010 ​​
  • Marie Curie scientist at ABB Coporate Research, Switzerland, Sep. 2009- Feb. 2010

Awards

  • Marie Curie Fellow, EU, Sep. 2009 - Feb. 2010
  • ​Dorothy Hodgkin Postgraduate Awards, EPSRC, UK, 2005-2008
  • ​Research Scholarship, Singapore, 2003-2005