Last updated: October 2016

SIM Chee Khian/SIM Chee-Khian

Lecturer

10/2014 to Present

Phone:
+44 (0)23 9284 6788
Email:
chee-khian.sim@port.ac.uk
Mail:
Department of Mathematics
University of Portsmouth
Lion Gate Building, Lion Terrace
Portsmouth, PO1 3HF
United Kingdom

Previous Academic-Related Positions Held

National University of Singapore, Singapore

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

The Hong Kong Polytechnic University, Hong Kong

  • Lecturer, Department of Applied 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

  • Fellow, Higher Education Academy, U.K. - 10/2015 to present
  • 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, in particular, inventory management
  • Subgradient methods

Teaching/Supervisory Experience

  • Co-supervisor of a Ph.D. student.
  • Supervisor of M.Sc. (in Logistics and Supply Chain Management) and B.Sc. students.
  • Lecturer for undergraduate courses on Calculus, Linear Algebra, Operations Research Methods, Simulation, and graduate courses on Graphs and Networks, Decision Analysis, Simulation.
  • 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 Letters; Optimization Methods and Software; Pacific Journal on Optimization; SIAM Journal on Optimizaton.

Presentations Given (since 2010):

  • "On solving an application-based completely positive program of size 3 with further results", 20 minutes presentation, 14th EUROPT Workshop on Advances in Continuous Optimization, Warsaw, Poland, July 2016.
  • "On solving an application-based completely positive program of size 3 with further results", 1 hour presentation, ERGO Seminar, The University of Edinburgh, Edinburgh, U.K., March 2016.
  • "Distributionally robust newsvendor problem", 15 minutes presentation, CORL 2nd Annual Research and Innovation Event, Portsmouth, U.K., July 2015.
  • "On finding a generalised lowest rank solution to a linear semi-definite feasibility problem", 30 minutes presentation, 13th EUROPT Workshop on Advances in Continuous Optimization, Edinburgh, U.K., July 2015.
  • "Optimal inventory policies for remanufacturing systems that forecast product returns", 1 hour presentation, OR Seminar, University of Portsmouth, Portsmouth, U.K., November 2014.
  • "On the value of a little postponement and flexibility of a production system", 20 minutes presentation, POM International Conference 2014, Singapore, July 2014.
  • "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.

Publications

Refereed Publications:

  • M. Chou, C.K. Sim & X.-M. Yuan, "Infinite horizon optimal policy for an inventory system with two types of product sharing common hardware platforms", accepted by Operations Research Letters, October 2016.
  • Y. Hu, C.K. Sim & X. Yang, "A subgradient method based on gradient sampling for solving convex optimization problems", Numerical Functional Analysis and Optimization, Vol. 36(2015), pp. 1559-1584.
  • C.K. Sim, "On finding a generalized lowest rank solution to a linear semi-definite feasibility problem", Operations Research Letters, Vol. 43(2015), pp. 334-338.
  • Y. Hu, X. Yang & C.K. Sim, "Inexact subgradient methods for quasi-convex optimization problems", European Journal of Operational Research, Vol. 240(2015), pp. 315–327.
  • 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
  • Simulation softwares: Micro Saint Sharp; SIMUL8

Languages:

English; Mandarin