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以本溪市 195 5～ 1996年的猩红热、流脑、肝炎和伤寒逐月发病的数据为根据 ,利用混沌动力学中“相空间技术”,对疾病流行过程进行能量谱分析及混沌分析 .发现流脑和伤寒的流行过程是混沌的 ;并得到本溪流脑和伤寒数据的混沌迭代模型 .在模型参数变化范围内 ,流脑经历了周期状态、混沌状态、吸引不动的稳定状态之间的转换 ;伤寒经历了周期状态、混沌状态之间的转换 ;这表明疾病流行过程是复杂的 .给出疾病流行的“阈值”,以控制其流行涨落 .求出流脑的关联分维是2 .82 1,伤寒的关联分维是 3.0 87
Based on the data of monthly incidence of scarlet fever, meningitis, hepatitis and typhoid fever from 1995 to 1996 in Benxi City, the “phase space technique” in chaos dynamics was used to analyze the energy spectrum and chaos analysis of the disease epidemic. The epidemic process of brain and typhoid fever is chaotic, and the chaotic iterative model of meningitis and typhoid fever in Benxi is obtained. In the range of model parameters, the meningitis undergoes the transition between periodic state, chaotic state, and immobile steady state ; Typhoid fever experienced the transition between periodic state and chaos state; this indicates that the epidemic process of the disease is complex, and given the “threshold” of disease epidemic to control its epidemic fluctuation. 82 1, Typhoid associated fractal dimension is 3.087