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Maintenance, repair and overhaul (MRO) are important segments of the remanufacturing industry for the maintenance of complex capital goods. The uncertain processing time and routings make MRO scheduling differ greatly from traditional manufacturing. Simulation optimization is suitable to solve the problems with uncertainty. This work uses multi-fidelity optimization with ordinal transformation and...
Simulation and analytical tools are useful modeling methods to solve complex optimization problems. In this paper, we propose a simulation optimization framework called "Multi-fidelity Optimization with Ordinal Transformation and Optimal Sampling" (MO2TOS) when multi-fidelity models are available, and prove its efficiency by analyzing its convergence mechanism. The MO2TOS is a two-stage...
The imbalanced development among different levels of healthcare facilities has become a major social issue in China’s urban healthcare system, which has raised the irrational patient flow distribution on the levels of both intra-hospital and inter-healthcare facilities. In this research, we develop a methodology to find the optimal macrolevel patient flow distribution in terms of multidimension inputs...
The emergency department (ED) serves as a primary patient entry point into hospitals, and bottlenecks in the ED cause patient flow problems and increase costs throughout the entire hospital. EDs increasingly employ discrete event simulation as an analytical decision making tool to alleviate these problems. Simulation models quantify complicated emergency care delivery systems and help improve emergency...
In a traditional data warehouse, "subject oriented" means that all the measurements relating to the same real-world event or object are linked together. The measurements are classified and navigated by "subject". But in a multi-use data warehouse, users want to classify and navigate the measurements by mutable cross-classifications flexibly. It is hard to find a universal "subject"...
Due to the rapid spreading nature of Internet worms, it is necessary to implement automatic mitigation on the Internet. Inspired by worm vaccinations, we propose a novel epidemic model which combines both vaccinations and dynamic quarantine methods, referred to as SEIQV model. Using SEIQV model, we obtain the basic reproduction number that governs whether or not a worm is extinct. The impact of different...
As the wide uses of access control model in systems, a more agile access control model is required to solve complicated modeling, user authorizing and verifying problem. In this paper, an access control model based on the concepts of role, attribute and context, named C-RBAC, is proposed. This model is based on and further improved role-based access control (RBAC). The proposed model adds system conditions...
The most important concept of a market is price - the terms on which the trading objects (products or services) are exchanged. In an ideal market, the price is a reflection of the current state of the market, and therefore it should be dynamic. From the seller perspective, using an effective dynamic pricing strategy can make a difference between making a profit or loss in a market. In a grid marketplace,...
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