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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...
Wireless location is one of the core technologies of Wireless Sensor Network. In many applications, the accuracy of the location is the precondition of the useful of data information the node collected. Under the premise of cost limits, improving the accuracy of wireless sensor node position has crucial significance. After analyzing reasons of the location weakness of Dv-Distance algorithm due to...
In this paper, we study the radiation treatment planning optimization for Volumetric-Modulated Arc Therapy (VMAT). A nonlinear mixed integer programming model is formulated, then the linearization technique is used, and the resulting mixed integer programming model is solved by a heuristic approach based on the Nested-Partitions framework. The approach partitions the feasible region iteratively and...
In this paper we study the radiation treatment planning optimization for Volumetric-Modulated Arc Therapy (VMAT). A nonlinear mixed integer programming model is formulated considering dose rate change and MLC leaf speed constraints. Linearization technique is applied to this model, and the resulting mixed integer programming model is solved by heuristic approach based on Nested Partitions method....
With the development of Natural Gas Pipeline in China, gas turbine & compressor unit has been widely used, so the fault diagnosis of its equipment is important particularly. In this paper, the method based on SDG (Signed Directed Graph) and Bayes theory is applied to fault diagnosis of the equipment. According to SDG model and Bayes theory, this method finds the consistent path and gets the optimizing...
Referral incentive policy plays a key role in "Two-Level Healthcare Delivery System" established in urban China by means of guiding more patients to choose Community Health Centers (CHC) as the first treatment. However, two important questions about this referral incentive policy have not been investigated yet, including "Dose the referral incentive policy really work in the sense of...
Passive worms have posed serious security threats to unstructured P2P networks. A delayed SEIRS epidemic model with death, offline and online rate is constructed based on the actual situation of P2P users. The basic eproduction number that governs whether a passive worm is extinct or not is obtained. In this model, time delay consists of latent and temporary immunity periods. The impact of different...
As the community health care plays an important role in improving the health care equality and efficiency nowadays, It is one of the targets of the health care reform to establish a well distributed geographical community health network in China. In this paper, taking Haidian District in Beijing City as an example, the CHCs locations as well as the service allocation problem is solved by using an...
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