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										Employment:1-10.1988 Post Doc. FIM, 
ETH-Zürich;
 10.1988 – 12.1990 Associate Professor at Nankai Institute of 
Mathematics, Nankai Univ.;
 12.1990 - now Full Professor at Nankai Institute 
of Mathematics, Nankai Univ. (Nankai Inst. of Math. changed its name to Chern 
Institute of Mathematics in 2005).
 
										Research Interests:Hamiltonian 
dynamics,Variational methods, Symplectic geometry,Riemannian and Finsler 
geometry.
 
										Selected Awards and 
honouries: 1987 Dissertation 
Award, Sigma-Xi Research Association, Wisconsin Chapter;
 1996 Excellent 
Young Scholar Award, Hong Kong Qiu Shi Science and Technology 
foundation;
 1998 Shiing-Shen Chern Award, Chinese Mathematical 
Society;
 2000 Yangzi River Award Program specially hired professorship, the 
Ministry of Education of China;
 2003 Award for Advances in Science and 
Technology (First class), by the Ministry of Education of China;
 2004 
National Award in Natural Science of China (Second class), by the State Council 
of China;
 2004 TWAS Award in Mathematics, by the Third World Academy of 
Sciences (TWAS);
 2007 Member of the Chinese Academy of Sciences;
 2008 
Fellow of the Academy of Sciences for the Developing World (TWAS);
 2012 
Fellow of the American Mathematical Society.
 
										Selected Academic Services and Functions: Dean of School of Mathematics, Nankai University, 1998-2003;
 President of Tianjin Mathematical Society, 2002-2010;
 Vice President of 
Chinese Mathematical Society, 2004-2011;
 Representative in the Pacific Rim 
Mathematical Association, 2005-2009;
 Director of Chern Institute of 
Mathematics, Nankai University, 2008-6.2012;
 Vice Chairman of the Academic 
Committee of Nankai University, since 2008;
 Vice Chairman of Tianjin 
Association of Science and Technology, since 2009;
 Member of the Executive 
Committee of International Mathematical Union, since 2011;
 Editor/Editorial 
board member: Chinese Annals of Mathematics, Advanced Nonlinear Studies, Acta 
Mathematica Sinica, Frontiers of Mathematics in China, Communications on Pure 
and Applied Analysis.
 
										Selected addressPlenary address, 2010 Chinese 
Math. Soc. and Korea Math. Soc. joint Conference and the Annul Conference
 of 
Chinese Math. Soc., Chongqing, 2010;
 Invited speaker, Symplectic Geometry 
Session, Congress of the Pacific Rim Mathematical Association, 2009;
 Invited 
speaker, The TWAS 16th conference, Alexsandra, 2005;
 Invited speaker, 
International Congress of Mathematicians, Beijing, 2002;
 Plenary address, 
International Congress of Chinese Mathematicians, Taipei, 2001;
 Plenary 
address, SIAM Conference on Dynamical Systems, Maui, 2000;
 
										Selected publications[1] Multiple solutions 
of perturbed superquadratic second order Hamiltonian systems. Trans. Amer. 
Math. Soc. 311 (1989) 749-780.
 [2] Maslov-type index, degenerate 
critical points, and asymptotically linear Hamiltonian systems. Science in 
China. Series A. 33 (1990) 1409-1419.
 [3] Bott formula of the 
Maslov-type index theory. Pacific J. Math. 187 (1999), 113-149.
 [4] 
Precise iteration formulae of the Maslov-type index theory and ellipticity of 
closed characteristics. Advances in Math. 154 (2000) 76-131.
 [5] 
(Joint with Chaofeng Zhu) Closed characteristics on compact convex hypersurfaces 
in R2n. Annals of Mathematics. 155 (2002). 317-368.
 [6] Index Theory 
for Symplectic Paths with Applications. Progress in Math. 207, Birkh?user. 
Basel. 2002.
 [7] Multiplicity and stability of closed geodesics on Finsler 
2-spheres. J. of Euro. Math. Soc. 8 (2006) 341-353.
 [8] (Joint with 
Wei Wang, Xijun Hu) Resonance identity, stability and multiplicity of closed 
characteristics on compact convex hypersurfaces. Duke Math. J. 139 
(2007) 411-462.
 [9] (Joint with Huagui Duan) Multiple closed geodesics on 
3-spheres. Advances in Math. 221 (2009) 1757-1803.
 [10] (Joint with 
Victor Bangert) The existence of two closed geodesics on every Finsler 2-sphere. Math. Ann. 346 (2010) 335-366.
 
										  
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