Last updated: May 2014

SIM Chee Khian/SIM Chee-Khian

Senior Research Fellow

11/2012 to Present

Phone:
+65 6516 1060
Fax:
+65 6779 2621
Email:
bizsimc@nus.edu.sg
Mail:
Department of Decision Sciences
NUS Business School
National University of Singapore
Mochtar Riady Building, BIZ 1 8-69
15 Kent Ridge Drive
Singapore 119245

Previous Academic-Related Positions Held

The Hong Kong Polytechnic University, Hong Kong

  • Lecturer, Department of Applied Mathematics

National University of Singapore, Singapore

  • Research Fellow, Department of Decision Sciences
  • Research Engineer, Department of Decision Sciences
  • Part-time Graduate Tutor, Department of Mathematics

The Logistics Institute - Asia Pacific, Singapore

  • Research Fellow

University of Washington, Seattle, U.S.A.

  • Teaching Assistant, Department of Mathematics

Education

National University of Singapore, Singapore

  • Ph.D. in Mathematics (2005). Specialized in Optimization
  • Postgraduate Diploma in Systems Analysis (1999)
  • B.Sc. (with Honors) in Mathematics (1993)

University of Washington, Seattle, U.S.A.

  • M.Sc. in Mathematics (1997). Specialized in Optimization

Honors & Awards

  • Biography included in Marquis Who's Who in the World 2011
  • A*STAR Graduate Fellowship, Singapore
  • NUS Research Scholarship, Singapore
  • University of Washington Teaching Assistantship, U.S.A.

Professional Membership

  • SIAM Member - 10/2009 to 12/2013.
  • INFORMS Member - 08/2012 to 12/2012.
  • The Hong Kong Mathematical Society Member - 06/2010 to 06/2012.

Research Interests

  • Semi-definite programming - theory and applications
  • Supply chain management
  • Subgradient methods

Teaching/Supervisory Experience

  • Co-supervisor of a Ph.D. student.
  • Lectured undergraduate courses on Calculus, Linear Algebra, Operations Research Methods, and graduate courses on Graphs and Networks, Decision Analysis.
  • Tutor for beginning level mathematics courses, as well as, business analytics courses.

Industrial Experience

  • Led and completed two systems interfaces migration from an old to a new platform.
  • Did reverse-engineering to produce functional documentations for IT systems.
  • Maintained IT systems, conducted user acceptance testings with users, and also did unit and system testings.

Professional Activities

Invited reviewer for Mathematical Reviews.

Journal Referee:

Asia-Pacific Journal of Operational Research; Computational Optimization and Applications; IEEE Transactions on Automatic Control; International Journal of Production Economics; Journal of Industrial and Management Optimization; Journal of Optimization Theory and Applications; Mathematical Methods of Operations Research; Mathematical Programming; Optimization; Optimization Methods and Software; Pacific Journal on Optimization; SIAM Journal on Optimizaton.

Presentation Given:

  • "Optimal policies for inventory systems with two types of product sharing common hardware platforms", 20 minutes presentation, 23rd Annual POM Conference, Chicago, U.S.A., April 2012.
  • "Local convergence of interior point methods on semi-definite programs using a path-based approach", 20 minutes presentation, 19th Triennial Conference for the International Federation of Operational Research Societies (IFORS2011), Melbourne, Australia, July 2011.
  • "Optimal policies for inventory systems with two types of product sharing common hardware platforms: single period and finite horizon", 15 minutes presentation, The 8th International Conference on Optimization: Techniques and Applications (ICOTA8), Shanghai, China, December 2010.
  • "Asymptotic behavior of underlying NT paths in interior point methods for monotone semidefinite linear complementarity problems", 20 minutes presentation, International Conference on Engineering and Computational Mathematics (ECM2009), Hong Kong, May 2009.
  • "An RFID-enabled model with no cross-over of orders", 20 minutes presentation, Second International Workshop on Successful Strategies in Supply Chain Management, Hong Kong, January 2009.
  • "On the underlying paths and local convergence behavior of an interior point algorithm for semidefinte linear complementarity problems", 1 hour presentation, Departmental Seminar, The Hong Kong Polytechnic University, Hong Kong, September 2008.
  • "An RFID-enabled model with no cross-over of orders", 20 minutes presentation, The 7th International Conference on Optimization: Techniques and Applications (ICOTA7), Kobe, Japan, December 2007.
  • "An RFID-enabled model with no cross-over of orders", 1 hour presentation, Brown Bag Seminar, The Logistics Institute-Asia Pacific, Singapore, February 2007.
  • "Some results on the underlying paths and local convergence behavior of IPMs for SDLCPs", 1 hour talk, Workshop on Duality and Conic Optimization, Tsinghua University, Beijing, China, December 2006.
  • "Conic optimization - Some developments in semi-definite programming", 1 hour presentation, Brown Bag Seminar, The Logistics Institute - Asia Pacific, Singapore, April 2006.
  • "Second order cone program in relation to interior point method", 20 minutes presentation, International Conference on Scientific and Engineering Computation (IC-SEC'04), Singapore, June 2004.

Publications

Refereed Publications:

  • Y. Hu, X. Yang & C.-K. Sim, "Inexact subgradient methods for quasi-convex optimization problems", accepted by European Journal of Operational Research, May 2014.
  • M. Chou, C.K. Sim & X.-M. Yuan, "Optimal policies for inventory systems with two types of product sharing common hardware platforms: single period and finite horizon", European Journal of Operational Research, Vol. 224(2013), pp. 283-292.
  • E.P. Chew, L.H. Lee & C.K. Sim, "The impact of supply chain visibility when lead time is random", OR Spectrum, Vol. 35(2013), pp. 163-190.
  • M. Chou, C.K. Sim, C.-P. Teo & H. Zheng, "Newsvendor pricing problem in a two-sided market", Production and Operations Management, Vol. 21(2012), pp. 204-208.
  • C.K. Sim, "Superlinear convergence of an infeasible predictor-corrector path-following interior point algorithm for a semidefinite linear complementarity problem using the Helmberg-Kojima-Monteiro direction", SIAM Journal on Optimization, Vol. 21(2011), pp. 102-126.
  • C.K. Sim, "Asymptotic behavior of underlying NT paths in interior point methods for monotone semidefinite linear complementarity problems", Journal of Optimization Theory and Applications, Vol. 148(2011), pp. 79-106.
  • C.K. Sim, "On the analyticity of underlying HKM paths for monotone semidefinite linear complementarity problems", Journal of Optimization Theory and Applications, Vol. 141(2009), pp. 193-215.
  • C.K. Sim & G. Zhao, "Asymptotic behavior of Helmberg-Kojima-Monteiro (HKM) paths in interior point methods for monotone semidefinite linear complementarity problems: general theory", Journal of Optimization Theory and Applications, Vol. 137(2008), pp. 11-25.
  • C.K. Sim & G. Zhao, "Underlying paths in interior point methods for the monotone semidefinite linear complementarity problem", Mathematical Programming, Series A, Vol. 110(2007), pp. 475-499.
  • C.K. Sim, J. Sun & D. Ralph, "A note on the lipschitz continuity of the gradient of the squared norm of the matrix-valued Fischer-Burmeister function", Mathematical Programming, Series A, Vol. 107(2006), pp. 547-553.
  • C.K. Sim & G. Zhao, "A note on treating a second order cone program as a special case of a semidefinite program", Mathematical Programming, Series A, Vol. 102(2005), pp. 609-613.

Conference Papers:

  • C.K. Sim, "Second order cone prograrm in relation to interior point method", International Conference on Scientific and Engineering Computation (IC-SEC'04), June 2004.

Notes


Others

Computer Experience:

  • Operating systems: Windows; Unix.
  • Computer languages exposed to: Cobol; C; Visual Basic; Java; SQL; HTML.
  • Mathematical softwares: Matlab; Latex.

Languages:

English; Mandarin.