In this paper,we establish and study a single-species logistic model with impulsive age-selective harvesting.First,we prove the ultimate boundedness of the solutions of the system.Then,we obtain conditions for the asy...In this paper,we establish and study a single-species logistic model with impulsive age-selective harvesting.First,we prove the ultimate boundedness of the solutions of the system.Then,we obtain conditions for the asymptotic stability of the trivial solution and the positive periodic solution.Finally,numerical simulations are presented to validate our results.Our results show that age-selective harvesting is more conducive to sustainable population survival than non-age-selective harvesting.展开更多
目的基于LASSO-Logistic回归分析影响慢性鼻窦炎伴鼻息肉(chronic rhinosinusitis with nasal polyps,CRSwNP)术后嗅觉功能恢复的危险因素,构建预测模型。方法收集2022年9月至2024年12月于本院行鼻内镜手术的CRSwNP患者270例,依据术后...目的基于LASSO-Logistic回归分析影响慢性鼻窦炎伴鼻息肉(chronic rhinosinusitis with nasal polyps,CRSwNP)术后嗅觉功能恢复的危险因素,构建预测模型。方法收集2022年9月至2024年12月于本院行鼻内镜手术的CRSwNP患者270例,依据术后嗅觉功能恢复情况分为良好组(n=207)和不良组(n=63),分析影响CRSwNP术后嗅觉功能恢复的危险因素,并构建预测模型。结果270例患者术后嗅觉功能恢复不良发生率为23.33%(63/270)。LASSO回归结合多因素Logistic回归分析显示,嗅觉功能障碍持续时间、合并变应性鼻炎、病变类型、疾病分型以及分期、Lund-Kennedy评分、复诊次数是独立影响因素(P均<0.001)。基于此构建的列线图预测模型内部验证一致性指数为0.731,校准良好;ROC曲线下面积(AUC)为0.783(95%CI:0.677~0.889),敏感度和特异性分别为81.25%与67.50%。结论影响CRSwNP患者术后嗅觉功能恢复的危险因素包括嗅觉功能障碍持续时间≥2年、合并变应性鼻炎、嗅裂区息肉、疾病分型及分期≥Ⅱ型2期、Lund-Kennedy评分≥2分以及复诊次数>3次,基于上述因素所构建的预测模型,可为临床医生提供术后嗅觉功能恢复的预测依据。展开更多
基金Supported by the National Natural Science Foundation of China(12261018)Universities Key Laboratory of Mathematical Modeling and Data Mining in Guizhou Province(2023013)。
文摘In this paper,we establish and study a single-species logistic model with impulsive age-selective harvesting.First,we prove the ultimate boundedness of the solutions of the system.Then,we obtain conditions for the asymptotic stability of the trivial solution and the positive periodic solution.Finally,numerical simulations are presented to validate our results.Our results show that age-selective harvesting is more conducive to sustainable population survival than non-age-selective harvesting.
文摘目的基于LASSO-Logistic回归分析影响慢性鼻窦炎伴鼻息肉(chronic rhinosinusitis with nasal polyps,CRSwNP)术后嗅觉功能恢复的危险因素,构建预测模型。方法收集2022年9月至2024年12月于本院行鼻内镜手术的CRSwNP患者270例,依据术后嗅觉功能恢复情况分为良好组(n=207)和不良组(n=63),分析影响CRSwNP术后嗅觉功能恢复的危险因素,并构建预测模型。结果270例患者术后嗅觉功能恢复不良发生率为23.33%(63/270)。LASSO回归结合多因素Logistic回归分析显示,嗅觉功能障碍持续时间、合并变应性鼻炎、病变类型、疾病分型以及分期、Lund-Kennedy评分、复诊次数是独立影响因素(P均<0.001)。基于此构建的列线图预测模型内部验证一致性指数为0.731,校准良好;ROC曲线下面积(AUC)为0.783(95%CI:0.677~0.889),敏感度和特异性分别为81.25%与67.50%。结论影响CRSwNP患者术后嗅觉功能恢复的危险因素包括嗅觉功能障碍持续时间≥2年、合并变应性鼻炎、嗅裂区息肉、疾病分型及分期≥Ⅱ型2期、Lund-Kennedy评分≥2分以及复诊次数>3次,基于上述因素所构建的预测模型,可为临床医生提供术后嗅觉功能恢复的预测依据。
