排序方式: 共有19条查询结果,搜索用时 15 毫秒
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为了解决红外光谱定量分析中的特征提取和校正规模问题,提出了一种输入层自构造神经网络。这种网络能够利用训练数据的某些先验知识,自动选择输入层神经元的个数。在学习过程中,输入神经元个数从最小值1开始,根据网络误差的变化逐步增加,最终确定最佳神经元数量。这种网络模型将特征提取和参数学习过程融为一体,有利于提高建模效率。利用仿真红外光谱的定量分析实验表明,这种网络模型不仅能够对光谱数据实现高效率的波长选择,并具有抑制随机噪声和非线性干扰的能力。 相似文献
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采用构造叠加晕新方法、新技术,研究新立金矿床矿中已知矿体构造叠加晕特点,建立了新立金矿床深部盲矿定位预测的构造叠加晕模型,用矿床模型对新立金矿床深部及其外围进行盲矿预测,提出具体盲矿预测靶位,为深部探矿增储提供依据。 相似文献
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Xiang-Long Li Hua Ye Dong-Cheng Chen Kun-Kun Liu Gao-Zhan Xie Yi-Fan Wang Chang-Cheng Lo A. Lien Junbiao Peng Yong Cao Shi-Jian Su 《Israel journal of chemistry》2014,54(7):971-978
A series of triazole and pyridine hybrid molecules, with a triazole core and pyridine periphery, were designed and synthesized as an electron-transport layer (ETL) and a hole/exciton-block layer for green phosphorescent organic light-emitting diodes. Compared with the widely-used electron-transport material (ETM) of 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ) with a triazole core, lower-lying HOMO and LUMO energy levels were obtained with the introduction of pyridine rings onto the periphery of the molecules, giving improved electron injection and carrier confinement. Significantly reduced driving voltages were achieved in a device structure of ITO/HATCN (5 nm)/TAPC (40 nm)/CBP:8 wt % Ir(PPy)3 (10 nm)/ETL (40 nm)/LiF (1 nm)/Al (90 nm), giving a maximum power efficiency of 72.2 lm W−1 and an external quantum efficiency of 21.8 %, due to the improved electron injection and transport and thus, more balanced carrier recombination, which are much higher than those of the device based on TAZ. 相似文献
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基于确定周期性任务的进程管理及可调度性分析 总被引:4,自引:1,他引:3
文中讨论了基于确定周期性任务的实时进程管理,对确定周期性任务采用调度器生成的管理方式,通过截止期递增分类法将非性任务分为两类,分别采用中断内抢占调度和信号调度,提出了改进的最大紧急度优先算法,分析了目标系统的可调度性,给出了春可调度的充要条件。 相似文献
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通过对俄霍布拉克煤矿地质资料及矿区水系的分析,采用巷道疏水截流技术方案治理矿井东翼第四系冲击层潜流水,方案实施后,潜流水疏放效果明显,解决了矿井东翼水患问题,取得了较好的社会经济效益。 相似文献
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推荐系统能够根据用户的偏好有效地过滤信息,已被广泛应用于各行各业,但随着用户数量的爆炸式增长,数据稀疏性和冷启动问题日益严重.多源数据融合可以有效缓解数据稀疏和冷启动情况下的推荐精度,其主要思想是融合用户在其他方面的辅助信息来填补缺失值,以优化目标服务的推荐准确度,受到了研究者的青睐,但由于数据之间的关联引入了更为严重的隐私泄露风险.针对以上问题,提出一种基于跨域关联与隐私保护的深度推荐模型,设计一种具有多源数据融合和差分隐私保护特征的深度学习协同推荐方法.该方法一方面融合辅助领域信息以提高推荐的精确度,同时修正异常点的偏差,改善推荐系统的性能;另一方面针对数据融合中的数据安全问题,基于差分隐私模型在协同训练过程中加入噪音以保证数据的安全性.为了更好地评价推荐系统中的长尾效应,首次提出一种新的评价指标-发现度,用以度量推荐算法发现用户隐性需求的能力.基于已有算法进行了性能对比与分析,实验结果证明,所提方法在保证隐私安全的前提下,比现有方法具有更好的推荐精度和多样性,能够有效地发现用户的隐性需求. 相似文献
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Influence of meteorological conditions and particulate matter on visual range impairment in Jinan, China 总被引:9,自引:0,他引:9
Yang LX Wang DC Cheng SH Wang Z Zhou Y Zhou XH Wang WX 《The Science of the total environment》2007,383(1-3):164-173
To understand the influence of aerosol particles and meteorological conditions on visual range in Jinan, the capital of Shandong Province, China, PM(2.5) and PM(10) samples were collected from November 2004 to September 2005. The mass concentrations of PM(2.5) and PM(10), concentrations of water-soluble ions in PM(2.5) and concentrations of black carbon (BC) in the atmosphere were analyzed. The decrease of visual range in Jinan results from the combined influence of PM(2.5), PM(10) and meteorological conditions. For the period studied, the average light extinction coefficient, b(ext), which was estimated from an equation developed by the IMPROVE network was 292 Mm(-1). Ammonium sulfate was the major contributor to visual range impairment, accounting for 41%, while ammonium nitrate, particulate organic matter (POM) and BC made comparable contributions accounting for 20%, 22% and 18%, respectively. This highlights the significance of secondary particles ((NH(4))(2)SO(4), NH(4)NO(3), POM) in visual range impairment in Jinan. The data from this study are also compared with the long-term variations of visual range in Jinan from 1961 to 2005. 相似文献