SIM Chee Khian/SIM CheeKhian
Lecturer
10/2014 to Present
 Phone:
 +44 (0)23 9284 6788
 Email:
 cheekhian.sim@port.ac.uk
 Mail:

Department of Mathematics
University of Portsmouth
Lion Gate Building, Lion Terrace
Portsmouth, PO1 3HF
United Kingdom

National University of Singapore, Singapore
 Senior Research Fellow, Department of Decision Sciences
 Research Fellow, Department of Decision Sciences
 Research Engineer, Department of Decision Sciences
 Parttime Graduate Tutor, Department of Mathematics
The Hong Kong Polytechnic University, Hong Kong
 Lecturer, Department of Applied Mathematics
The Logistics Institute  Asia Pacific, Singapore
University of Washington, Seattle, U.S.A.
 Teaching Assistant, Department of Mathematics
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
 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.
 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.
 Semidefinite programming  theory and applications
 Supply chain management
 Subgradient methods
 Cosupervisor of a Ph.D. student.
 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.
 Led and completed two systems interfaces migration from an old to a new platform.
 Did reverseengineering to produce functional documentations for IT systems.
 Maintained IT systems, conducted user acceptance testings with users, and also did unit and system testings.
Invited reviewer for Mathematical Reviews.
Journal Referee:
AsiaPacific 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):
 "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 semidefinite 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 semidefinite programs using a pathbased 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.
Refereed Publications:
 Y. Hu, C.K. Sim & X. Yang, "A subgradient method based on gradient sampling for solving convex optimization problems", Numerical Functional Analysis and Optimization, accepted August 2015.
 C.K. Sim, "On finding a generalized lowest rank solution to a
linear semidefinite feasibility problem", Operations Research Letters, Vol. 43(2015), pp. 334338.
 Y. Hu, X. Yang & C.K. Sim, "Inexact subgradient methods for quasiconvex 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. 283292.
 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. 163190.
 M. Chou, C.K. Sim, C.P. Teo & H. Zheng, "Newsvendor pricing problem in a twosided market", Production and Operations Management, Vol. 21(2012), pp. 204208.
 C.K. Sim, "Superlinear convergence of an infeasible predictorcorrector pathfollowing interior point algorithm for a semidefinite linear complementarity problem using the HelmbergKojimaMonteiro direction", SIAM Journal on Optimization, Vol. 21(2011), pp. 102126.
 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. 79106.
 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. 193215.
 C.K. Sim & G. Zhao, "Asymptotic behavior of HelmbergKojimaMonteiro (HKM) paths in interior point methods for monotone semidefinite linear complementarity problems: general theory", Journal of Optimization Theory and Applications, Vol. 137(2008), pp. 1125.
 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. 475499.
 C.K. Sim, J. Sun & D. Ralph, "A note on the lipschitz continuity of the gradient of the squared norm of the matrixvalued FischerBurmeister function", Mathematical Programming, Series A, Vol. 107(2006), pp. 547553.
 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. 609613.
Conference Papers:
 C.K. Sim, "Second order cone prograrm in relation to interior point method", International Conference on Scientific and Engineering Computation (ICSEC'04), June 2004.
Computer Experience:
 Operating systems: Windows; Unix.
 Computer languages exposed to: Cobol; C; Visual Basic; Java; SQL; HTML.
 Mathematical softwares: Matlab; Latex.
Languages:
English; Mandarin.


