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流域水循环的人工影响因素及其作用 被引量:4
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作者 李文生 许士国 《水电能源科学》 2007年第4期28-32,共5页
针对目前流域中存在的水资源短缺及生态环境的恶化,探讨了流域健全水循环的概念和分析计算。从分析水循环的自然—人工二元结构性出发,以太子河流域为背景,建立了太子河流域水循环模型。通过长系列资料的演算,初步得出太子河流域水循环... 针对目前流域中存在的水资源短缺及生态环境的恶化,探讨了流域健全水循环的概念和分析计算。从分析水循环的自然—人工二元结构性出发,以太子河流域为背景,建立了太子河流域水循环模型。通过长系列资料的演算,初步得出太子河流域水循环状况的变化趋势。摄动分析结果表明,影响太子河流域健全水循环的人工因素依次是生活用水、工业用水和农业用水。 展开更多
关键词 人工影响因素 健全 水循环 太子河流域
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Artificial neural network in studying factors of hepatic cancer recurrence after hepatectomy
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作者 贺佳 贺宪民 张智坚 《Journal of Medical Colleges of PLA(China)》 CAS 2002年第1期65-68,共4页
Objective: To explore the affecting factors of liver cancer recurrence after hepatectomy. Methods:The BP artificial neural network - Cox regression was introduced to analyze the factors of recurrence in1 457 patients.... Objective: To explore the affecting factors of liver cancer recurrence after hepatectomy. Methods:The BP artificial neural network - Cox regression was introduced to analyze the factors of recurrence in1 457 patients. Results: The affecting factors statistically significant to liver cancer prognosis was selected.There were 18 factors to be selected by uni-factor analysis, and 9 factors to be selected by multi-factor analysis. Conclusion: The 9 factors selected can be used as important indexes to evaluate the recurrence of liver cancer after hepatectomy. The artificial neural network is a better method to analyze the clinical data, which provides scientific and objective data for evaluating prognosis of liver cancer. 展开更多
关键词 artificial neural network liver cancer affecting factors
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