Wengtat Chan - Academia.edu (original) (raw)

Papers by Wengtat Chan

Research paper thumbnail of A Hybrid GA-CP Approach for Production Scheduling

2009 Fifth International Conference on Natural Computation, Aug 14, 2009

Constraint programming (CP) uses constraints present in production scheduling problems to derive ... more Constraint programming (CP) uses constraints present in production scheduling problems to derive feasible schedules but encounters computational difficulties when problem complexity increases. A hybrid method is proposed which uses genetic algorithms for global search and CP for constraint solving. Its performance is illustrated with an example from precast production scheduling presented as constrained precast scheduling model (CPSM). Results show that

Research paper thumbnail of Construction Resource Scheduling with Genetic Algorithms

Journal of Construction Engineering and Management, Jun 1, 1996

A new approach for resource scheduling using genetic algorithms (GAs) is presented here. The meth... more A new approach for resource scheduling using genetic algorithms (GAs) is presented here. The methodology does not depend on any set of heuristic rules. Instead, its strength lies in the selection and recombination tasks of the GA to learn the domain of the specific project network. By ...

Research paper thumbnail of Derivation of Pareto Front with Genetic Algorithm and Neural Network

Journal of Hydrologic Engineering, 2001

It is common knowledge that the optimal values of the calibrated parameters of a rainfall-runoff ... more It is common knowledge that the optimal values of the calibrated parameters of a rainfall-runoff model for one model response may not be the optimal values for another model response. Thus, it is highly desirable to derive a Pareto front or trade-off curve on which each point ...

Research paper thumbnail of An application of genetic algorithms to precast production scheduling

Computers & Structures, 2001

There are two alternatives for production organisation in precast factories, namely the comprehen... more There are two alternatives for production organisation in precast factories, namely the comprehensive method and the specialised method. Production scheduling under the specialised alternative has been found to be a difficult optimisation problem if ...

Research paper thumbnail of Collaborative Scheduling over the Internet

Computer-Aided Civil and Infrastructure Engineering, 1999

The modern global economy compels people to communicate, collaborate, and cooperate efficiently. ... more The modern global economy compels people to communicate, collaborate, and cooperate efficiently. To date, information technology has facilitated this communication and collaboration by making the transfer of information quicker and more efficient through the use of digital and computer communications. However, it is argued that the efficient transfer of information is not enough; people still must coordinate their decisions based on the information exchanged. There is always the danger that the volume of information and the pace at which the information is exchanged will overwhelm the people, and they will not realize the implications of their decisions based on this information. This is especially so when the information exchange is across organizational boundaries. Computer support for such decision coordination is still very much lacking. This article looks at the subject of decision coordination in a very task-specific area, that of precast fabrication scheduling. It discusses the issues involved and describes the proposed system model for implementing a groupware application for doing distributed scheduling. It also discusses the technology that will be used to implement the application.

Research paper thumbnail of Collaborative scheduling over the internet

The modern global economy compels people to communicate, collaborate, and cooperate efficiently. ... more The modern global economy compels people to communicate, collaborate, and cooperate efficiently. To date, information technology has facilitated this communication and collaboration by making the transfer of information quicker and more efficient through the use of digital and computer communications. However, it is argued that the efficient transfer of information is not enough; people still must coordinate their decisions based on the information exchanged. There is always the danger that the volume of information and the pace at which the information is exchanged will overwhelm the people, and they will not realize the implications of their decisions based on this information. This is especially so when the information exchange is across organizational boundaries. Computer support for such decision coordination is still very much lacking. This article looks at the subject of decision coordination in a very task-specific area, that of precast fabrication scheduling. It discusses the issues involved and describes the proposed system model for implementing a groupware application for doing distributed scheduling. It also discusses the technology that will be used to implement the application.

Research paper thumbnail of A Hybrid GA-CP Approach for Production Scheduling

2009 Fifth International Conference on Natural Computation, Aug 14, 2009

Constraint programming (CP) uses constraints present in production scheduling problems to derive ... more Constraint programming (CP) uses constraints present in production scheduling problems to derive feasible schedules but encounters computational difficulties when problem complexity increases. A hybrid method is proposed which uses genetic algorithms for global search and CP for constraint solving. Its performance is illustrated with an example from precast production scheduling presented as constrained precast scheduling model (CPSM). Results show that

Research paper thumbnail of Construction Resource Scheduling with Genetic Algorithms

Journal of Construction Engineering and Management, Jun 1, 1996

A new approach for resource scheduling using genetic algorithms (GAs) is presented here. The meth... more A new approach for resource scheduling using genetic algorithms (GAs) is presented here. The methodology does not depend on any set of heuristic rules. Instead, its strength lies in the selection and recombination tasks of the GA to learn the domain of the specific project network. By ...

Research paper thumbnail of Derivation of Pareto Front with Genetic Algorithm and Neural Network

Journal of Hydrologic Engineering, 2001

It is common knowledge that the optimal values of the calibrated parameters of a rainfall-runoff ... more It is common knowledge that the optimal values of the calibrated parameters of a rainfall-runoff model for one model response may not be the optimal values for another model response. Thus, it is highly desirable to derive a Pareto front or trade-off curve on which each point ...

Research paper thumbnail of An application of genetic algorithms to precast production scheduling

Computers & Structures, 2001

There are two alternatives for production organisation in precast factories, namely the comprehen... more There are two alternatives for production organisation in precast factories, namely the comprehensive method and the specialised method. Production scheduling under the specialised alternative has been found to be a difficult optimisation problem if ...

Research paper thumbnail of Collaborative Scheduling over the Internet

Computer-Aided Civil and Infrastructure Engineering, 1999

The modern global economy compels people to communicate, collaborate, and cooperate efficiently. ... more The modern global economy compels people to communicate, collaborate, and cooperate efficiently. To date, information technology has facilitated this communication and collaboration by making the transfer of information quicker and more efficient through the use of digital and computer communications. However, it is argued that the efficient transfer of information is not enough; people still must coordinate their decisions based on the information exchanged. There is always the danger that the volume of information and the pace at which the information is exchanged will overwhelm the people, and they will not realize the implications of their decisions based on this information. This is especially so when the information exchange is across organizational boundaries. Computer support for such decision coordination is still very much lacking. This article looks at the subject of decision coordination in a very task-specific area, that of precast fabrication scheduling. It discusses the issues involved and describes the proposed system model for implementing a groupware application for doing distributed scheduling. It also discusses the technology that will be used to implement the application.

Research paper thumbnail of Collaborative scheduling over the internet

The modern global economy compels people to communicate, collaborate, and cooperate efficiently. ... more The modern global economy compels people to communicate, collaborate, and cooperate efficiently. To date, information technology has facilitated this communication and collaboration by making the transfer of information quicker and more efficient through the use of digital and computer communications. However, it is argued that the efficient transfer of information is not enough; people still must coordinate their decisions based on the information exchanged. There is always the danger that the volume of information and the pace at which the information is exchanged will overwhelm the people, and they will not realize the implications of their decisions based on this information. This is especially so when the information exchange is across organizational boundaries. Computer support for such decision coordination is still very much lacking. This article looks at the subject of decision coordination in a very task-specific area, that of precast fabrication scheduling. It discusses the issues involved and describes the proposed system model for implementing a groupware application for doing distributed scheduling. It also discusses the technology that will be used to implement the application.