William K. W. Cheung

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Markov decision process (MDP) is commonly used to model a stochastic environment for supporting optimal decision making. However, solving a large-scale MDP problem under the partially observable condition (also called POMDP) is known to be computationally intractable. Belief compression by reducing belief state dimension has recently been shown to be an(More)
Malaria transmission can be affected by multiple or even hidden factors, making it difficult to timely and accurately predict the impact of elimination and eradication programs that have been undertaken and the potential resurgence and spread that may continue to emerge. One approach at the moment is to develop and deploy surveillance systems in an attempt(More)
The transmission of infectious diseases can be affected by many or even hidden factors, making it difficult to accurately predict when and where outbreaks may emerge. One approach at the moment is to develop and deploy surveillance systems in an effort to detect outbreaks as timely as possible. This enables policy makers to modify and implement strategies(More)
In response to the outbreak of an emerging infectious disease, e.g., H1N1 influenza, public health authorities will take timely and effective intervention measures to contain disease spread. However, due to the scarcity of required resources and the consequent social-economic impacts, interventions may be suggested to cover only certain subpopulations,(More)
Emerging Web technologies have enabled the use of distributed on-line resources to support on-demand cooperative problem solving. Domain ontology is one of the resources typically required by many existing problem-solving systems. In this paper, we argue that to meet the on-demand requirement, on-line problem-solvers should go beyond the use of static(More)
BACKGROUND To investigate transmission patterns of an infectious disease, e.g., malaria, it is desirable to use the observed surveillance data to discover the underlying (often hidden) disease transmission networks. Previous studies have provided methods for inferring information diffusion networks in which each node corresponds to an individual person.(More)
The rapid development of Semantic Web in recent years has resulted in the emerging standards-RDF, OWL, SWRL, for representing knowledge in the Web environment. At the same time, the concept of Grid computing has emerged to cope with distributed resource sharing in a trusted environment, where Globus is currently the de facto standard of grid middleware with(More)
Over the past two decades, gender digital divide has been widely researched and discussed. Previous studies have focused on computer attitudes, anxiety, use and experience. The purpose of this study is to examine gender difference empirically in ICT competency in first year undergraduate students. The results revealed that females' scores were statistical(More)
Erratum After the publication of this work [1], we noticed an error the author's name Ji-Ming Liu should be spelt as Jiming Liu. The original article was corrected. The publisher apologises for this error. permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source,(More)