Lau Hoong Chuin's Research

My primary research interest is in the design of methodologies, engines and systems that support optimized decision-making in the business world. To date, I have focused on utilizing math modeling, meta-heuristics and agent reasoning for large-scale planning and scheduling problems. Shaped by the ideal for developing theory and methods that are truly applicable in industry, I have chosen to concentrate on logistics, supply chain management and e-Commerce problems – bringing together computationally efficient analytic methods, working tools and systems to address selected industry problems. These range from operational problems such as real-time reactive vehicle routing and dynamic scheduling for assemble-to-order in multi-echelon facilities, to strategic/tactical problems such as defense acquisition and resource planning, resource consolidation and risk pooling, and joint inventory/transport planning.

Here's my recent research statement.

The following is a list of my publications and invited presentations in reverse chronological order:

2012

N. FU, H. C. LAU, P. VARAKANTHAM, and F. Xiao. Robust Local Search for Solving RCPSP/max with Durational Uncertainty. Journal of Artificial Intelligence Research, Forthcoming. 2012.

D. T. NGUYEN, W. YEOH, and H. C. LAU. Stochastic Dominance in Stochastic DCOPs for Risk Sensitive Applications. In Proc. 11th International Conference on Autonomous Agents and Multiagent Systems (AAMAS), Valencia, Spain, June 2012.

G. GORDON, P. VARAKANTHAM, W. YEOH, A. SRINIVASAN, H. C. LAU, and S. F. CHENG. Lagrangian Relaxation for Solving Theme Park Crowd Management Problems. In Proc. 11th International Conference on Autonomous Agents and Multi-Agent Systems, Valencia, Spain, June 2012.

A. GUNAWAN and H. C. LAU. Master Physician Scheduling Problem. Journal of the Operational Research Society, Forthcoming.

2011

H. C. Lau, Z. Zhao, S. Ge, T. H. Lee. Allocating resources in multi-agent flowshops with adaptive auctions. IEEE Trans. Automation Science and Engineering, 8(4), 732-743, 2011.

S. F. Cheng, J. Tajan, H. C. Lau. Robust distributed scheduling via time period aggregation, Web Intelligence and Agent Systems: An International Journal, 2011.

K. W. Tan, N. Fu and H. C. Lau. Improving service through Just-in-Time concept in a dynamic operational environment. In Proc. Hawaii International Conf. on System Sciences (HICSS), Decision Technology, Mobile Technologies and Service Science track), Hawaii, USA, January 2011.

Lindawati, H. C. Lau and D. Lo. Instance-based Parameter Tuning via Search Trajectory Similarity Clustering. In Proc. Learning and Intelligent OptimizatioN Conference (LION5), LNCS volume 6683, 131-145, Rome, Italy, January 2011.

A. Gunawan, H. C. Lau and Lindawati. Fine-Tuning Algorithm Parameters using the Design of Experiments. In Proc. Learning and Intelligent OptimizatioN Conference (LION5), LNCS volume 6683, 278-292, Rome, Italy, January 2011.

A. Gunawan, H. C. Lau and E. Wong. Real-World Parameter Tuning using Factorial Design with Parameter Decomposition. In Proc. 9th Metaheuristics International Conference (MIC), Udine, Italy, July 2011.

S. Kimbrough and H. C. Lau. Finding Robust-under-Risk Solutions for Flowshop Scheduling. In Proc. 9th Metaheuristics International Conference (MIC), Udine, Italy, July 2011.

S. Wang, D. Lo, L. Jiang, Lucia, and H. C. Lau. Search-Based Fault Localization. In Proc. 26th IEEE/ACM International Conference on Automated Software Engineering (ASE), Lawrence, USA, November 2011.

L Agussurja and H. C. Lau. A POMDP Model for Guiding Taxi Cruising in a Congested Urban City. In Proc. 10th Mexican International Conference on Artificial Intelligence (MICAI), LNAI volume 7094, 415-428, Puebla, Mexico, November 2011.

H. Chen and H. C. Lau. A math-heuristic approach for integrated resource scheduling in a maritime logistics facility. In Proc. IEEE International Conference on Industrial Engineering and Engineering Management (IEEM), Singapore, December 2011. (Best paper award, Honorable Mention)

H. C. Lau. Multi-Agent Coordination in Humanitarian and Emergency Response Logistics. Invited talk at AAAI Fall Symposium Workshop on Multiagent Coordination under Uncertainty. Arlington, Virginia, USA, 2011.

2010

H. C. Lau, J. Pan, and H. Song. Periodic Resource Reallocation in Two-Echelon Repairable Item Inventory Systems, IEEE Trans. Automation Science and Engineering, 7:3, 474–485, 2010.

N. Fu, P. Varakantham, H. C. Lau. Towards Finding Robust Execution Strategies for RCPSP/max with Durational Uncertainty. In Proc. International Conf. on Automated Planning and Scheduling (ICAPS), Toronto, Canada, May 2010.

S. Kimbrough, A. Kuo, H. C. Lau Effective Heuristic Methods for Finding Non-Optimal Solutions of Interest in Constrained Optimization Models. In Proc. Genetic and Evolutionary Computation Conference (GECCO), Portland, Oregon, USA, July 2010.

S. Kimbrough, A. Kuo, H. C. Lau: On decision support for deliberating with constraints in constrained optimization models. In Proc. GECCO Workshop on Evolutionary computation techniques for constraint handling, GECCO Companion:1833-1840.

A. Gunawan and H. C. Lau. The Bi-Objective Master Physician Scheduling Problem. In Proc. Practice and Theory of Automated Timetabling (PATAT), Belfast, North Ireland, August 2010.

R. Thangarajoo and H. C. Lau. Distributed Route Planning and Scheduling via Hybrid Conflict Resolution. In Proc. IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT), Toronto, Canada, August, 2010.

H. X. Chen and H. C. Lau. Decentralized Resource Allocation and Scheduling via Walrasian Auctions with Negotiable Agents. In Proc. IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT), Toronto, Canada, August 2010. Also presented at European Conference on Operational Research, Lisbon, Portugal

H. C. Lau. Real World Project Management: How to Efficiency Generate a Robust Schedule? Invited talk at Distinguished Speaker Series, Leeds School of Business, University of Colorado (Boulder), USA.

H. C. Lau. Master Physician Scheduling Problem. Invited talk at Asia Pacific Workshop on Decision Support Technology, Taipei, Republic of China, 2010.

2009

Z. Zhao, S. Ge and H. C. Lau. Integrated Resource Allocation and Scheduling in Bidirectional Flow Shop with Multi-Machine and COS Constraints. IEEE Trans. Systems, Man, Cybernetics (Part C), 39:2, 190-200, 2009.

A. Liang, X. Wu, H. C. Lau, Optimizing Service Systems based on Application-Level QoS. IEEE Trans. Service Computing, 2:2, 108-121, 2009.

L. Agussurja and H. C. Lau. The Price of Stability in Selfish Scheduling Games. Web Intelligence and Agent Systems: An International Journal, 9:4, 2009.

H. C. Lau and F. Xiao. Enhancing the Speed and Accuracy of Automated Parameter Tuning in Heuristic Design. In Proc. 8th Metaheuristics International Conference (MIC), Hamburg, Germany, July 2009.

S. Kimbrough, A. Kuo, H. C. Lau, Lindawati and D. H. Wood, On Using Genetic Algorithms to Support Post-Solution Deliberation in the Generalized Assignment Problem. In Proc. 8th Metaheuristics International Conference (MIC), Hamburg, Germany, July 2009.

I. R. Wior, Z. Zhao, M. Luo, J. Zhang, S. S. Ge, H. C. Lau. Conceptual Framework of a Dynamic Resource Allocation Test Bed-Its Practical Realization with ProModel. In Proc. IEEE Multi-conference on Systems and Control, Saint Petersburg, Russia, July 2009.

J. Zhang, H. C. Lau and J. Shen. Setting Discrete Bid Levels in Adaptive Auctions. In Proc. International Conf. on Electronic Commerce (ICEC), Taipei, Taiwan, August 2009.

A. Gunawan and H. C. Lau. Master Physician Scheduling Problem. In Proc. 4th Multidisciplinary International Conference on Scheduling: Theory and Applications (MISTA), Dublin, Ireland, August 2009.

H. C. Lau. Optimising Performance In Logistics And Supply Chains Through Real-Time Optimisation Technology. Invited presentation at Defense Logistics (Middle East) Summit, Abu Dhabi, UAE, January 2009.

H. C. Lau. A Combinatorial Auction Framework for Solving Decentralized Resource Allocation and Scheduling. Invited presentation at DiCoMAS Seminar on New Approaches to Planning and Scheduling, Brussels, Belgium, November 2009.

H. C. Lau. Combinatorial Auction as a Meta-Heuristic Mechanism for Decentralized Resource Allocation. Keynote presentation at Special Conference on Methods and Applications of Metaheuristics, Guangzhou, China, December 2009.

2008

H. C. Lau, L. Agussurja and R, Thangarajoo, Real-Time Supply Chain Control via Multi-Agent Adjustable Autonomy. Computers & Operations Research (Special Issue on Real-time Supply Chain Management), 35, 3452– 3464, 2008.

G. Feng and H. C. Lau. Efficient Algorithms for Machine Scheduling Problems with Earliness and Tardiness Penalties. Annals of Operations Research (Special Issue on Scheduling), 159, 83-95, 2008.

H. C. Lau and H. Song, Optimization of Two-Echelon Repairable Inventory System with Limited Repair Facility under Non-Stationary Demands. International Journal of Inventory Research. 1:1, 67-92, 2008.

H. C. Lau and F. Xiao. The Oil Drilling Model and Iterative Deepening Genetic Annealing Algorithm for the TSP, In A. Fink and F, Rothlauf (eds), Advances in Computational Intelligence in Transportation and Logistics, Studies in Computational Intelligence. Springer, 169-184, 2008.

H. C. Lau, K. W. Lye, V. B. Nguyen, A Combinatorial Auction Framework for Solving Decentralized Scheduling Problems. In Proc. Fifth International Conf. on Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems (CPAIOR) Paris, France, May, 2008.

Z. Y. Zhao, Kim, Luo, Lau, Ge and Zhang. A Heuristic Method for Job-Shop Scheduling with an Infinite Wait Buffer. In Proc. IEEE Conf. Cybernetics and Intelligent Systems, (CIS), Chengdu, China, June, 2008.

R. Thangarajoo, L. Agussurja, H. C. Lau. A Hybrid Approach to Convoy Movement Planning in an Urban City. In Proc. Innovative Applications of Artificial Intelligence (IAAI), Chicago, USA, July 2008.

H. C. Lau, Z. Zhao, S. Ge and T. H. Lee. Utility Pricing Auction for Multi-period Resource Allocation in Multi-Machine Flow Shop Problems. In Proc. International Conf. on Electronic Commerce (ICEC), Innsbruck, Austria, August 2008.

J. H. Park, J. K. Lee and H. C. Lau. Relationship-Preserving E-Procurement Auction. In Proc. International Conf. on Electronic Commerce (ICEC), Innsbruck, Austria, August, 2008.

N. Fu, F. Xiao and H. C. Lau, Generating Robust Schedules Subject to Resource and Duration Uncertainties. In Proc. International Conf. on Automated Planning and Scheduling (ICAPS), Sydney, Australia, September, 2008.

Q. Liang, H. C. Lau and X. Wu, Robust Application-Level QoS Management in Service-Oriented Systems. In Proc. IEEE International Conf. on Electronic Business Engineering (ICEBE), Xian, China, October, 2008.

S. F. Cheng, J. Tajan and H. C. Lau. Distributing complementary resources across multiple periods with stochastic demand: Hedging via time frame adjustment. In Proc. IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT), Sydney, Australia, December 2008.

H. C. Lau, Hedging Uncertainty with Robust Project Schedules. Invited presentation at Annual MINDEF d-Logistics Seminar, Singapore, September 2008.

2007

H. C. Lau, W. C. Wan, S. Halim and K. Y. Toh. A Software Framework for Rapid Hybridization of Meta-Heuristics. International Trans. Operations Research (Special Issue for the 17^th IFORS Triennial Conf.). 14:2, 123-141, 2007.

S. Halim and H. C. Lau. Visual Diagnostics for Parameter Tuning in Meta-Heuristics. In K. F. Doerner et al. (eds) Metaheuristics – Progress in Complex Systems Optimization (MIC 05 post-conference volume). Springer Operations Research / Computer Science Interfaces Book Series. 365-388, 2007.

H. C. Lau and F. Xiao. Towards an Intelligent Meta-Heuristics Development Framework. Proc. 7th Metaheuristics International Conference (MIC), Montreal, Canada, June 2007.

T. Y. Leong and H. C. Lau. Generating Job Schedules for Vessel Operations in a Container Terminal. Proc. 3rd Multidisciplinary International Conference on Scheduling: Theory and Applications (MISTA), Paris, France, August 2007.

H. C. Lau, T. Ou and F. Xiao. Robust Local Search and Its Application to Generating Robust Schedules. Proc. International Conf. on Automated Planning and Scheduling (ICAPS), Rhode Island, USA, September, 2007.

S. Halim, R. Yap and H. C. Lau. An Integrated White+Black Box Approach for Designing and Tuning Stochastic Local Search. Proc. 13th International Conf. on Principles & Practice of Constraint Programming (CP), Rhode Island, USA, September, 2007.

Z. Zhao, T. Y. Leong, S. Ge, and H. C. Lau. Bidirectional Flow Shop Scheduling with Multi-Machine Capacity and Critical Operation Sequencing. Proc. 22nd IEEE International Symp. on Intelligent Control (ISIC), Singapore, October 2007.

H. C. Lau, S. F. Cheng, T. Y. Leong, J. H. Park and Z Zhao. Multi-Period Combinatorial Auction Mechanism for Distributed Resource Allocation and Scheduling. Proc. IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT), San Jose, USA, 2007.

L. Agussurja and H. C. Lau. The Price of Stability in Selfish Scheduling Games. Proc. IEEE/WIC/ACM International Conference on Intelligent Agent Technology (IAT), San Jose, USA, 2007.

H. C. Lau. Multi-Period Combinatorial Auctions for Distributed Resource Allocation. Presented at 22nd EUROPEAN CONFERENCE ON OPERATIONAL RESEARCH (EURO), Prague, Czech Republic, July 2007.

2006

H. C. Lau, H. Song, C. T. See and S. Y. Cheng. Evaluation of Time-Varying Availability in Multi-Echelon Spare Parts Systems with Passivation, European J. Operational Research. 170:1, 2006, 91-105. (PDF)

H. C. Lau, T. H Ngo and B. N. Nguyen. Finding a Length-Constrained Maximum-Sum or Maximum-Density Subtree and Its Application to Logistics, Discrete Optimization, 3:4, 2006.

S. Halim, R. Yap and H. C. Lau. Search Trajectory Visualization for Analysing Trajectory-Based Meta-Heuristic Search Algorithm. Proc. European Conference on AI (ECAI) 2006. Verona, Italy. August 2006.

H. C. Lau and B. Viet, Solving Generalized Open Constraint Optimization Problem using Two-Level Multi-Agent Framework – Improved Results. European Conference on AI 2006 Workshop on Distributed CSP (DisCSP), Verona, Italy. August 2006.

H. C. Lau, J. Li, and R. Yap. Robust Controllability in Temporal Constraint Networks under Uncertainty. Proc. 18th IEEE Conf. on Tools with Artificial Intelligence (ICTAI) Washington D.C., November 2006. Also presented in European Conference on AI 2006 Workshop on Modeling and Solving Problems with Constraints. Verona, Italy, August 2006.

S. Halim, R. Yap and H. C. Lau. Explaining Local Search Behavior Using Viz: The Local Search Visual Analysis Suite. Proc. 19^th Annual ACM Symposium on User Interface Software and Technology (UIST) 2006. Montreux, Switzerland. October 2006.

H. C. Lau and H. Song, Periodic Resource Reallocation in Multi-Echelon Inventory Systems, Proc. IEEE Conference on Automation Science and Engineering (CASE) , Shanghai, China, October 2006. 

H. C. Lau, K. M. Ng and R, Thangarajoo, A Hybrid MIP/Heuristic Model for Experience Based Driver Assignment. Proc. 18th IEEE Conf. on Tools with Artificial Intelligence (ICTAI) Washington D.C., November 2006.

H. C. Lau and W. C. Wan. iMDF: Intelligent Meta-heuristics Development Framework. Presented at 19th Intl Symp. on Mathematical Programming, July 2006, Rio de Janeiro, Brazil. 

H. C. Lau, G. L. Soh and W. C. Wan, Dynamic Multi-Linked Negotiations in Multi-Echelon Production Scheduling Networks. Proc. IEEE/WIC/ACM Int'l Conf. on Intelligent Agent Technology (IAT), December 2006. Also presented at IFIP Workshop on Virtual Environments for Advanced Modeling. Hamburg, Germany, June 2006.

H. C. Lau, G. L. Soh and W. C. Wan, Dynamic Response Aircraft Payload System. Invited presentation at Annual MINDEF d-Logistics Seminar, Singapore, September 2006.

2005

H. C. Lau, W. C. Wan and X. Jia, A Generic Object-Oriented Tabu Search Framework, In  Ibaraki, Toshihide, Nonobe, Koji, and Yagiura, Mutsunori (eds.), Metaheuristics : Progress as Real Problem Solvers (MIC 2003 post-conference volume), 203-226, Kluwer Academic Publishers, Boston, USA. (PDF)

H. C. Lau and H. Wang, A Multi-Agent Approach for Solving Optimization Problems involving Expensive Resources, Proc. 20th ACM Symposium on Applied Computing (SAC), 79-83, New Mexico, USA, March 2005.(PDF)

H. C. Lau and W. C. Wan. A Development Framework for Rapid Meta-heuristics Hybridization. Presented at 17th Triennial Conference of the IFORS, July 2005, Hawaii, USA.

G. Feng and H. C. Lau. Efficient Algorithms for Machine Scheduling Problems with Earliness and Tardiness Penalties. Proc. 2nd Multidisciplinary International Conference on Scheduling: Theory and Applications (MISTA), 196-212, New York City, USA, July 2005.

H. C. Lau and H. Song, Evaluation of Time-Varying Availability in Multi-Echelon Inventory System with Combat Damage, Proc. IEEE Conference on Automation Science and Engineering (CASE), 226-231, Edmonton, Canada, August 2005. (PDF)

H. C. Lau, W. C. Wan, and S. Halim, Tuning Tabu Search Strategies via Visual Diagnosis. Proc. 6th Metaheuristics International Conference (MIC), 630-636, Vienna, August 2005.

H. C. Lau, L. Zhang and C. Liu, Solving Generalized Open Constraint Optimization Problem using Two-Level Multi-Agent Framework, Proc. IEEE/WIC/ACM Int'l Conf. on Intelligent Agent Technology (IAT), 558-564, France, September 2005.

H. C. Lau, L. Agussurja and R, Thangarajoo, Partial Adjustable Autonomy in Multi Agent Environment and Its Application to Military Logistics, Proc. IEEE/WIC/ACM Int'l Conf. on Intelligent Agent Technology (IAT), 152-156, France, September 2005.

H. C. Lau, T. Ou and M. Sim, Robust Temporal Constraint Networks. Proc. 17th IEEE Conf. on Tools with Artificial Intelligence (ICTAI) (Special Track on AI in Logistics and Supply Chain Management), 82-88, Hong Kong, November 2005. 

2004

 Y. Song and H. C. Lau, A Periodic-Review Inventory Model with Application to the Continuous-Review Obsolescence Problem, European J. Operational Research, 159:1, 2004, 110-120. (PDF)

H. C. Lau, K. M. Ng, and X. Wu. Transport Logistics Planning with Service-Level Constraints, Proc. 19th National Conf. on Artificial Intelligence (AAAI), San Jose, USA, July 2004. 519-524. (PDF)

H. C. Lau, K. M. Ng, and X. Wu. Transport Scheduling with Service-Level Constraints - Complexity and Algorithms, Proc. 2nd Int'l Symp. on Scheduling (ISS), 11-16, Hyogo, Japan, May 2004. 

H. C. Lau and M. K. Lim. Multi-Period Multi-Dimensional Knapsack Problem and Its Application to Available-to-Promise, Proc. 2nd Int'l Symp. on Scheduling (ISS), 94-99, Hyogo, Japan, May 2004. (PDF)

H. C. Lau, M. K. Lim, W. C. Wan, and S. Halim. A Development Framework for Rapid Meta-heuristics Hybridization, Proc. 28th IEEE Computer Society Signature Conf. on Software Technology and Applications (COMPSAC), 362-367, Hong Kong, September 2004. (PDF)

H.C. Lau and L. Zhang, A Two-level Framework for Coalition Formation via Optimization and Agent Negotiation, Proc. IEEE/WIC/ACM Int'l Conf. on Intelligent Agent Technology (IAT), 441-445, Beijing, China, September 2004.  (PDF)

H. C. Lau and H. Song,  Two-Echelon Repairable Item Inventory System with Limited Repair Capacity under Nonstationary Demands, Proc. 35th Meeting of the Decision Sciences Institute (DSI), 1901-1908, Boston, USA, November 2004.   (PDF)

H. C. Lau, K. Y. Neo, and W. C. Wan, Corrective Maintenance Optimization in an Air Force, Proc. 35th Meeting of the Decision Sciences Institute (DSI), 1911-1917, Boston, USA, November 2004.   (PDF)

H. C. Lau and C. Zhang, Job Scheduling with Unfixed Availability Constraints, Proc. 35th Meeting of the Decision Sciences Institute (DSI), 4401-4406, Boston, USA, November 2004.  (PDF)

H. C. Lau, Integrated Vehicle and Driver Resource Optimization for Supporting Centralized MT Line. Invited presentation at Annual MINDEF d-Logistics Seminar.

Singapore, September 2004. 

2003

H. C. Lau, M. Sim and K. M. Teo, "Vehicle Routing Problem with Time Windows and a Limited Number of Vehicles", European J. Operational Research, 148:3, 2003, 559-569. (PDF)

H. C. Lau, W. S. Lim, "Multi-Agent Coalition via Autonomous Price Negotiation in a Real-Time Web Environment", Proc. IEEE/WIC Int'l Conf. on Intelligent Agent Technology (IAT), Halifax, 2003. 580-583.  (PDF)

H. C. Lau and L. Zhang, "Task Allocation via Multi-Agent Coalition Formation: Taxonomy, Algorithms and Complexity". Proc. 15th IEEE Conf. on Tools with Artificial Intelligence (ICTAI), Sacramento, USA, 2003. 346-350. (PDF)

H. C. Lau, W. C. Wan and X. Jia, "A Generic Object-Oriented Tabu Search Framework", Proc. 5th Metaheuristics International Conference, Kyoto, Japan, 2003. Also presented at EURO/INFORMS Joint International Meeting, Istanbul, Turkey. (PDF)

H. C. Lau, M. K. Lim, W. C. Wan, H. Wang and X. Wu, "Solving Multi-Objective Multi-Constrained Optimization Problems using Hybrid Ants System and Tabu Search", Proc. 5th Metaheuristics International Conference, Kyoto, Japan, 2003.  (PDF)

H. C. Lau, Optimization of Spares Allocation for Corrective Maintenance in a Multi-Echelon Time-Varying Environment. Invited presentation at Annual MINDEF d-Logistics Seminar, Singapore, September 2003. 

E. Barnes, J. Dai, S. Deng, D. Down, M. Goh, H. C. Lau and M. Sharafali, On the Strategy of Supply Hubs for Cost Reduction and Responsiveness, ICFAI Journal of Operations Management (Invited). May 2003.   

2002

H. C. Lau, Z. Liang, Pickup and Delivery Problem with Time Windows, Algorithms and Test Case Generation. Int. J. Artificial Intelligence Tools (invited), 11:3, 2002, 455-472. 

H. C. Lau, Y. G. Goh. An Intelligent Brokering System to Support Multi-Agent Web-Based 4th Party Logistics. Proc. 14th IEEE Conf. on Tools with Artificial Intelligence (ICTAI), Washington D.C., 2002. 154-161. 

H. C. Lau, H. Ono, and Q. Z. Liu. Integrating Local Search and Network Flow to Solve the Inventory Routing Problem. Proc. 18th National Conf. on Artificial Intelligence (AAAI), 9-14, Edmonton, Canada, 2002. (PDF)

H. C. Lau and Y. Song, Combining Two Heuristics to Solve a Supply Chain Optimization Problem. Proc. 15th European Conference on Artificial Intelligence (ECAI), 581-585, IOS Press, Amsterdam, 2002. 

H. C. Lau, H. Song. Integrated Spares and Resource Allocation for Corrective Maintenance Under Non-Stationary Demands. Proc. 6th Asia-Pacific Military Operations Research Society Symp. (AMORS), 2002. Invited presentation at Annual MINDEF d-Logistics Seminar, Singapore, September 2002. Abridged version of Presentation slides

H. C. Lau, A New Approach for Weighted Constraint Satisfaction. Constraints Journal (invited), 7:2, 2002, 150-165. (PDF)

2001

H. C. Lau, Z. Liang, Pickup and Delivery Problem with Time Windows, Algorithms and Test Case Generation. Proc. 13th IEEE Conf. on Tools with Artificial Intelligence (ICTAI), 333-340, 2001. Invited submission to Int. J. Artificial Intelligence Tools. (PDF)

H. C. Lau, G. Lo, A Multi-Agent Framework for Supporting Intelligent Fourth-Party Logistics. Proc. Int'l Conf. on Integrated Logistics, 2001, Singapore. (PDF)

H. C. Lau, Y. F. Lim, and Q. Z. Liu, Diversification of Search Neighborhood via Constraint-Based Local Search and Its Applications to VRPTW. Proc. 3rd International Workshop on Integration of AI and OR Techniques (CP-AI-OR), 2001, Kent, United Kingdom. Also presented at INFORMS Meeting, Salt Lake City, 2000. (PDF)

1999-2000

J. T. Chia, H. C. Lau, and A. Lim, Ant Colony Optimization for the Ship Berthing Problem. Proc. 5th Asian Computing Science Conference (ASIAN), LNCS (1742), 359-370, 1999.

Q. Z. Liu and H. C. Lau, Collaborative Model and Algorithms for Supporting Real-time Distribution Logistics System. Proc. CP99 Workshop on Large Scale Combinatorial Optimisation and Constraints, Alexandria, Virginia, USA. Electronic Notes in Discrete Mathematics, Volume 4, 1999. (Postscript).

H. M. Foo, H. W. Leong, Y. Lao, and H. C. Lau. A Multi-Criteria, Multi-Modal Passenger Route Advisory System. Proc. 1999 IES-CTR Int'l Symp., Singapore (invited publication in IES Journal), 1999 (Postscript).

H. C. Lau, A. Lim, and Q. Z. Liu. Solving a Supply Chain Optimization Problem Collaboratively. Proc. 17th National Conf. on Artificial Intelligence (AAAI), 780-785, Texas, USA, 2000. (PDF)

1997-1998

M. Halldorsson and H. C. Lau, Low-degree Graph Partitioning via Local Search with Applications to Constraint Satisfaction, Max Cut, and 3-Coloring, J. Graph Algorithms and Applications, 1:3, 1997, 1-13. (Postscript)

H. C. Lau and S. C. Lua, Efficient Multi-skill Crew Rostering via Constrained Sets. Proc. 3rd ILOG Int'l User Meeting, Paris, July 1997. (Postscript)

H. C. Lau and Dennis Seah, An Efficient Technique for Routing of Vehicle Reactively. Proc. 8th ITSA Annual Meeting and Exposition, Detroit, Michigan, May, 1998. (Postscript)

Q. Z. Liu, H.C. Lau, Dennis Seah, Sidney Chong, An Efficient Near-exact Algorithm for Large-Scale Vehicle Routing with Time Windows,  Proc. 5th World Congress on Intelligent Transportation Systems, Korea, October 1998. (Postscript)

X. Wu and H. C. Lau, Traffic Prediction in Intelligent Vehicle Highway Systems, Proc. Int'l Conf System Science and System Engineering, 424-429, Beijing, August, 1998. (Postscript)

1995-1996

H. C. Lau, Approximation of Constraint Satisfaction via Local Search, Proc. 4th Workshop on Algorithms and Data Structures (WADS), Springer Verlag LNCS (955), 461-472, 1995.

H. C. Lau, Manpower Scheduling with Shift Change Constraints, Transactions of the Information Processing Society of Japan (IPSJ), 36:5, 1995, 1271-1279.

H. C. Lau, On the Complexity of Manpower Shift Scheduling, Computers and Operations Research, 23:1, 1996, 93-102. (Postscript)

H. C. Lau, Combinatorial Approaches for Hard Problems in Manpower Scheduling, J. Operations Research Society of Japan, 39:1, 1996, 88-98.

H. C. Lau, Probabilistic Analysis of Local Search and NP-Completeness Results for Constraint Satisfaction. Proc. 2nd Intl Conf. Computing and Combinatorics (COCOON), Springer Verlag LNCS (1090), 371-380, 1996.

H. C. Lau, Probabilistic Analysis of Local Search for Random Instances of Constraint Satisfaction. Proc. 12th European Conf. Artificial Intelligence (ECAI), 195-199, 1996.

H. C. Lau and O. Watanabe, Randomized Approximations of the Constraint Satisfaction Problem. Proc. 5th Scandinavian Workshop on Algorithm Theory (SWAT), Springer Verlag LNCS (1097), 78-87, 1996.

H. C. Lau and O. Watanabe, Randomized Approximations of the Constraint Satisfaction Problem. Nordic J. Computing, 3, 1996, 405-424. (Invited)

H. C. Lau, A New Approach for Weighted Constraint Satisfaction: Theoretical and Computational Results. Proc. 2nd Int'l Conf. Principle and Practice of Constraint Programming (CP), Springer Verlag LNCS (1118), 323-337, 1996. Invited submission to Constraints Journal.

1993-1994

C. M. Khoong and H. C. Lau and L. W. Chew, Automated Manpower Rostering: Techniques and Experience, Int'l Transactions on Operational Research, 1:3, 1994, 353-361,

H. C. Lau, Changing Shift Assignment in Manpower Scheduling, Proc. ORSJ Spring Symp., May 1994, Nagoya, Japan, 169-170.

H. C. Lau, Manpower Scheduling with Shift Change Constraints, Proc. 5th Int'l. Symp. Algorithms and Computation (ISAAC), Springer Verlag LNCS (834), 616-624, 1994.

Before 1993

P. Powell and H. C. Lau, Branch Distance Optimization of Structured Programs, Computers and Mathematics with Applications, 19:12, 1990, 1184-1201.

C. M. Khoong and H. C. Lau, ROMAN: An Integrated Approach to Manpower Planning and Scheduling, In O. Balci and R. Sharda and S. Zenios (eds), CS & OR: New Development in Their Interfaces, Pergammon Press, 1992, 383-396.

H. C. Lau, Preference-based Scheduling via Constraint Satisfaction, In K. H. Phua et al. (eds), Optimization Techniques and Applications, Proc. Int'l. Conf. on Optimiz. Techniques and Applications (ICOTA), World Scientific, 1992, 546-554.

H. C. Lau and S. C. Wong, Unit-capacity Vehicle Scheduling via Constraint Satisfaction, Proc. Singapore Int'l. Conf. on Intelligent Systems (SPICIS'92), 1992, 243-248.

Non-Refereed Papers/Technical Reports

• H. C. Lau, Simple yet Effective Algorithms for Constraint Satisfaction and Related Problems (doctoral thesis). Dept. Computer Science, Tokyo Inst. of Technology, No. 96TR-0015, 1996.
• H. C. Lau and O. Watanabe, Randomized Approximation of Constraint Satisfaction and Stable Cut, Dept. Computer Science, Tokyo Inst. of Technology, No. 95TR-0019, 1995.
• H. C. Lau, Manpower Shift Scheduling with Monotonic Constraints, IEICE Technical Report, No COMP94-2, 1994, 11-20.
• H. C. Lau, Local Search for CSP and Its Applications to Rescheduling and Graph Coloring, Dept. Computer Science, Tokyo Inst. of Technology, No. 94TR-0014,  1994.
• H. C. Lau, Probabilistic Analysis of Local Search for Constraint Satisfaction and Its Applications to Rescheduling, Dept. Computer Science, Tokyo Inst. of Technology, No. 94TR-0036, 1994
• H. C. Lau, Manpower Shift Scheduling, Algorithms and Complexity (Part II) Dept. Computer Science, Tokyo Inst. of Technology, No. 94TR-0002, 1994.
• H. C. Lau, Manpower Shift Scheduling, Algorithms and Complexity (Part I), Dept. Computer Science, Tokyo Inst. of Technology, No. 93TR-0044, 1993.
• H. C. Lau, A Branch and Bound Algorithm for Interactive Shift Assignment, Information Technology Institute, Singapore, No ITI-KS-92-08, 1992. (Presented at ORSA CSTS Conference, Williamsburg, Virginia, Jan 1992).
• H. C. Lau and P. Powell, Jump Optimization of Structured Programs, Dept. Computer Science, University of Minnesota, No. TR-88-56, 1988.
• H. C. Lau and P. Powell, Branch Distance Optimization of Structured Programs, Dept. Computer Science, University of Minnesota, No. TR-88-58, 1988.