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人工神经网络在林火发生预报中的应用 被引量:9
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作者 温广玉 侯锡铭 陈华豪 《生物数学学报》 CSCD 2001年第2期225-228,共4页
对于林火发生预报,就是要将着火样本和不着火样本进地划分,得到一个判断是否发生林火的阈值.以往我们采用过数量化理论和回归分析判断,但那些都是线性划分,而对于不能线性划分的样本集,划分的效果就不是很好.本文利用人工神经网... 对于林火发生预报,就是要将着火样本和不着火样本进地划分,得到一个判断是否发生林火的阈值.以往我们采用过数量化理论和回归分析判断,但那些都是线性划分,而对于不能线性划分的样本集,划分的效果就不是很好.本文利用人工神经网络的二层感知器模型对着火样本和不着火样本进行了重新划分,二层感知器是在二维输入空间上用三条相交的直线,得到一个封闭区域以实现样本集的正确划分. 展开更多
关键词 林火发生预报 神经网络 二层感知器 样本分类 非线性问题 封闭区域 误差修正规则 学习方法
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Environmental regulation and trade pattern:a case of China 被引量:1
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作者 Qi Jianhong Zheng Yingmei Zhao Yong 《Ecological Economy》 2007年第3期234-242,共9页
As a growing number of countries, including both developed and developing countries, have in recent yearstaken environmental regulation at different levels, a question of great concern has been raised: can the regulat... As a growing number of countries, including both developed and developing countries, have in recent yearstaken environmental regulation at different levels, a question of great concern has been raised: can the regulation alterthe existing trade volume and trade pattern, and ultimately drive pollution-intensive industries to countries with low-levelregulations or even those without regulations at all? Starting from the three different propositions concerning therelationship between environmental regulation and trade pattern, this paper applies cointegration analysis and errorcorrection model to empirically testing the relationship between environmental regulation and trade in China during theperiod of 1985-2005. Our empirical results indicate that in the short run the collection of pollution discharge fees bearsa positive impact on the export share of clean products of total exports. Thus, higher pollution discharge fees raise theratio of clean products exports to total exports. This further indicates that more stringent environmental regulationpromotes the exports of clean products. In the long run pollution discharge fees are positively correlated with the exportshare of clean products but negatively associated with their import share. Such correlations imply that environmentalregulation tends to facilitate the international specialization in line with comparative advantages. 展开更多
关键词 Environmental regulation Trade pattern Cointegration analysis Error correction model
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