Design of fuzzy adaptive washout algorithm based on the novel tilt coordinate

Motion simulator usually appears the phenomenon of false cues and the workspace is limited in the process of washout. The proposed washout algorithm combines fuzzy logic control with the vestibular system to design the tilt coordination fuzzy adaptive filter, in order to minimize the vestibular sensory error below the human perception threshold. Owing to tilt coordination angular velocity limiter, the loss of low-pass acceleration must be compensated by the acceleration transform model. The translational channel decreases the possibility of the workspace beyond limitation and expands the scope of motion platform simulating input acceleration by using third-order filter. The simulation results show that the proposed algorithm can effectively overcome the phase retardation of classical washout algorithm, and then prevent the produce of false cues, decrease the displacement of motion platform simultaneously; in addition, white Gaussian noise simulates large variations in acceleration. The proposed washout algorithm can have maximal extreme value of acceleration and accurate simulating performance in general. It also proves that the proposed washout algorithm has a strong adaptability and reliability, which can effectively improve the dynamic fidelity for motion simulator.

面向分级诊疗的医疗资源配置决策研究

医疗改革的核心内容之一是如何合理配置有限的医疗资源，在制定政策对医疗资源进行配置时，功利性和公平性通常是相冲突的两个目标。基于健康效用理论，提出了权衡功利性和公平性的混合整数规划模型。公平性定义采用的是罗尔斯公平主义，当病人之间的健康效用差异不大时，采用公平主义标准，但当差异较大的时候，则采用功利主义标准。将模型应用到分级诊疗决策中，结果显示，对于治疗危重疾病应采用公平主义标准，将资源分配到高级别的医院；对于治疗常见轻微疾病应采用功利主义标准，将资源分配到低级别的医院。研究结果对卫生政策的制定具有理论指导意义。