Thereafter , the fractal dimension value of cracks distribution was presented as an effective index to appraise the corrosion level . relations between fractal dimension and rebar corrosion ratio , concrete deterioration factor and strength of the member were studied respectively . fractal nn model was also built up to predict the ultimate load bearing capacity of crc members obtained from the field corroded structures , good results are achieved , which could provide an applicable method to evaluate the durability of crc members 揭示出受腐蚀钢筋混凝土构件在荷载作用下表面裂缝分布服从统计意义上的分形，并对其进行了分形描述；提出以裂缝分形维数作为受腐蚀程度的有效衡量指标，首次实现了构件受腐蚀程度的定量描述；建立了裂缝分形维数与钢筋锈蚀率、混凝土劣化系数、构件承载力之间的定量关系，并建立了分形神经网络模型对实际受腐蚀钢筋混凝土构件进行了极限承载力的预测，取得了较好的预测效果。
Intake of msg ( monosodium glutamate ) contraceptive tablet , anti - infection drug leaded to a higher incidence of ds . the results of paternal exposed factors multi - unconditional logistic model showed that smoke , intake of msg and hepatitis were significantly related with ds . other factors , such as drinking leaded to a higher incidence of ds 对父亲单因素统计分析结果显示：在生育ds的父亲中，有吸烟史、饮酒史、肝炎患病史、味精用量较多者较对照组显著增高，具统计意义：多因素logistic回归分析结果表明吸烟、味精和肝炎与ds发生呈正相关。
