Jian Sun Associate Professor Mathematical Sciences Center Tsinghua University Jinchun Yuan, West Building Room 254 Tsinghua University, Beijing 100084 China Tel: 8610-62797274 Email: sunjian0813 AT gmail DOT com

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About Me I earned my Ph.D in Computer Science from the Ohio State University in August 2007. After that, I did three-year PostDoc (2007-2009 at Stanford University and 2009-2010 at Princeton University). In September 2010, I joined Mathematical Sciences Center in Tsinghua University. I also received both my Masters degree and Bachelor degree from Tsinghua University.

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Research Interests My research interests are in applying geometry and topology to shape analysis and data analysis. In particular, I work on algorithms for computing geometric and topological invariants, and numerical schemes for computing discrete differentials. My research belongs to the field of computational geometry and topology, and applies to a wide range of applications and fields from computer graphics to computational biology.

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Teaching Computational Conformal Geometry (Spring 2012)

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Opening for Ph.D students The Mathematical Sciences Center has several openings for Ph.D students in the field of geometric imaging, see here for more details.

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Publications (authors listed by alphabetical order in the papers marked with *)

• Fuzzy Geodesics and Consistent Sparse Correspondences For Deformable Shapes [pdf | bibtex ]
  Jian Sun, Xiaobai Chen and Thomas A. Funkhouser;   SGP 2010, to appear.


• Approximating loops in a shortest homology basis from point data ^* [pdf | bibtex ]
  Tamal Dey, Jian Sun and Yusu Wang;   SoCG 2010, to appear. arXiv:0909.5654v1[cs.CG], 30th September 2009.


• Road Network Reconstruction for Organizing Paths ^* [pdf | bibtex ]
  Daniel Chen, Leonidas J. Guibas, John Hershberger and Jian Sun;   SODA 2010,


• Constructing Multi-Resolution Markov State Models (MSMS) to Elucidate RNA Hairpin Folding Mechanisms [ pdf (coming soon) | bibtex ]
  X. Huang, Y. Yao, G. Bowman, J. Sun, L. Guibas, G. Carlsson and V. Pande;   PSB 2010,


• A Concise and Provably Informative Multi-Scale Signature Based on Heat Diffusion [ pdf | talk slides | software | bibtex ]
  Jian Sun, Maks Ovsjanikov and Leonidas Guibas;   SGP 2009, Best Paper


• Integral Estimation from Point Cloud in d-dimensional space: a Geometric View ^* [ pdf | bibtex ]
  Chuanjiang Luo, Jian Sun and Yusu Wang;   SoCG 2009


• Topological Methods for Exploring Low-density States in Biomolecular Folding Pathways [ pdf | bibtex ]
  Yuan Yao, Jian Sun, Xuhui Huang, Gregory R. Bowman, Gurjeet Singh, Michael Lesnick, Leonidas J. Guibas, Vijay S. Pande, Gunnar Carlsson;   Journal of Chemical Physics


• Constructing Laplace Operator from Point Clouds in R^d ^* [ pdf | talk slides | software | bibtex ]
  Mikhail Belkin, Jian Sun and Yusu Wang;   SODA 2009


• Structural Insight into RNA Hairpin Folding Intermediates [ pdf | bibtex ]
  Gregory R. Bowman, Xuhui Huang, Yuan Yao, Jian Sun, Gunnar Carlsson, Leonidas J. Guibas, and Vijay S. Pande; J. Am. Chem. Soc., ja8032857, ASAP article, (2008)


• Global Intrinsic Symmetries of Shapes [ pdf | bibtex ]
  Maks Ovsjanikov, Jian Sun and Leonidas J. Guibas;   SGP 2008, Best Student Paper


• Computing Geometry-aware Handle and Tunnel Loops in 3D Models [ pdf | bibtex ]
  Tamal K. Dey, Kuiyu Li, Jian Sun and David Cohen-Steiner;   SIGGRAPH 2008


• Discrete Laplace Operator on Meshed Surfaces ^* [ pdf | talk slides | software | bibtex ]
  Mikhail Belkin, Jian Sun and Yusu Wang;   SoCG 2008


• On computing handle and tunnel loops ^* [ pdf | software | bibtex ]
  Tamal K. Dey, Kuiyu Li and Jian Sun;   IEEE Proc. Internat. Conf. Cyberworlds (NASAGEM workshop) (2007)
  Journal version is in Computer-Aided Design, in press, doi:10.1016/j.cad.2009.01.001


• Defining and Computing Curve-skeletons with Medial Geodesic Function ^* [ pdf | talk slides | software | bibtex ]
  Tamal K. Dey and Jian Sun;   SGP 2006.


• Normal and Feature Estimations from Noisy Point Clouds ^* [ pdf | software | bibtex ]
  Tamal K. Dey and Jian Sun;   FSTTCS 2006


• An Adaptive MLS Surface for Reconstruction with Guarantees ^* [ pdf | talk slides | software | bibtex ]
  Tamal K. Dey and Jian Sun;  SGP 2005.
  For those interested in the proofs, please see the extended version Technical Report OSU-CISRC-4-05-TR26, April, 2005.


• Normal Estimation for Point Clouds: A Comparison Study for a Voronoi Based Method ^* [ pdf | talk slides | bibtex ]
  Tamal K. Dey, Gang Li and Jian Sun;  SPBG 2005.

Technical Reports and Preprints

• A Fast Geometric Clustering Method on Conformation Space of Biomolecules [ pdf | bibtex ]
  Jian Sun, Yuan Yao, Xuhui Huang, Vijay Pande, Gunnar Carlsson and Leonidas J. Guibas;   preprint


• A faster algorithm for matching planar maps under the weak Fr\'{e}chet distance ^* [ pdf | bibtex ]
  Daniel Chen, Leonidas J. Guibas, Qixing Huang and Jian Sun   preprint


• Extremal Surface Based Projections Converge and Reconstruct with Isotopy ^* [ pdf | bibtex ]
  Tamal K. Dey, Samrat Goswami and Jian Sun;  Technical Report OSU-CISRC-05-TR25, April, 2005

Thesis

• Reconstructing and Analyzing Surfaces in 3-Space [ pdf | defense slides ]
  Ph.D Thesis, The Ohio State University, July 2007
  Adviser: T. K. Dey.