Results 71 to 80 of about 108,435 (188)

多目标量化变分滤波贝叶斯WSN跟踪定位算法

open access: yes四川大学学报. 自然科学版, 2015
为进一步提高无线传感器网络节点跟踪定位精度降低能耗,提出一种多目标拥挤度差分优化的贝叶斯量化变分滤波预估WSN跟踪定位算法.首先,针对定位问题,采用贝叶斯量化变分滤波方法对目标下一位置区域进行预测,利用量化变分滤波方式选取合适的定位参与节点,并设计了量化变分滤波的多目标参数优化模型.其次,针对传统多目标优化算法寻优精度不高的问题,设计了基于种群个体拥挤度状况的多目标差分进化算法,对量化变分滤波算法参数进行优化,实现了滤波参数的多目标优化.最后,通过实验仿真表明,该算法能够有效实现目标节点的跟踪定位 ...
张睿敏, 陈钟, 李晓斌
doaj  

Leaf C:P ratio as a universal indicator of photosynthesis in subtropical woody species: Stoichiometric thresholds and metabolic trade‐offs

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen   +9 more
wiley   +1 more source

结合优化算法的神经网络图像复原算法

open access: yes四川大学学报. 自然科学版, 2011
提出了用遗传算法优化的神经网络和PSO算法优化的神经网络图像复原算法,并对它们的复原效果进行了比较.先用优化算法对神经网络的结构进行优化,然后利用优化后的神经网络的学习和泛化能力,用一组样本图像对网络进行训练,建立退化图像与原图像之间的非线性映射关系,最后用训练好的进化神经网络对待复原的退化图像进行图像复原.实验结果表明复原的图像无论在主观视觉还是定量分析上都取得了很好的效果.
李伟, 王正勇, 余艳梅
doaj  

Land use overrides climatic controls on soil organic nitrogen transformations: Contrasting responsiveness between forest and cropland ecosystems

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2128-2142, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang   +10 more
wiley   +1 more source

基于多层降维与FOA优化的接地网腐蚀故障诊断

open access: yesDianci bileiqi, 2016
针对变电站接地网腐蚀故障的精准定位与诊断问题,将果蝇优化算法运算速度快、全局收敛效果好的优点与电阻腐蚀倍数优化相结合,提出基于多层降维与果蝇优化的接地网腐蚀故障诊断方法。该方法以电压法与电阻法作为诊断机理,以果蝇优化算法作最优解全局搜索,结合多层降维解决接地网支路个数多的问题,降低优化复杂度,提高优化速度。以60条支路、36个节点的变电站接地网为例进行方法检验对比,结果表明,以果蝇优化算法为基础的电压法和电阻法均能取得较好的腐蚀故障诊断效果,电阻法的平均诊断误差略低于电压法,诊断效果较好,但时间代价更大。
陈海燕
doaj  

Developmental plasticity drives converge nt shifts in phosphorus acquisition strategies towards root phosphatase activity in Moso bamboo under nitrogen addition

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2221-2236, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Anthropogenic nitrogen (N) deposition is a major driver of global change. However, its effects on the developmental plasticity of plant nutrient strategies remain poorly understood.
Quan Li   +11 more
wiley   +1 more source

固封极柱真空灭弧室瓷壳长度的优化设计

open access: yesGaoya dianqi, 2017
文中论述了固封极柱真空灭弧室瓷壳长度的优化设计方法。笔者通过仿真计算、优化设计方案、再进行仿真计算得出优化设计结论。并将优化设计结论应用在工程实际中加以检验,实践证明了方案的正确性。通过上述优化设计工作,减少了瓷壳长度,在保障产品性能的基础是有效地降低了真空灭弧室的成本。
赵力楠
doaj  

A Shared Turn, Divergent Logics: A Comparison of International Student Employment Policies in China, Japan and Korea

open access: yesHigher Education Quarterly, Volume 80, Issue 3, July 2026.
ABSTRACT Amid intensified global talent competition and domestic demographic pressures, China, Japan and South Korea (hereafter, ‘Korea’) have expanded their international student policies beyond attraction and recruitment to include stronger measures for post‐study employment and retention, repositioning international students as strategic populations
Lilan Chen, Yingxin Liu, Xin Li
wiley   +1 more source

基于遗传算法的换流变压器滤波装置的优化设计

open access: yesGaoya dianqi, 2007
阐述了新型换流变压器及配套滤波装置的接线方案和滤波器设计特点,在此基础上建立了以初期投资最小为目标函数的滤波装置数学优化模型,在采用遗传算法对优化模型进行优化设计时,考虑到优化模型的特点,采用了混合罚函数法将有约束问题转化成带有罚项的无约束问题的目标函数。最后针对具体的新型高压直流输电平台模型给出了滤波装置优化设计的实例,算例结果验证了该优化设计的正确性。
罗隆福   +5 more
doaj  

变压器分接开关内酚醛压板的神经网络全局优化设计

open access: yesGaoya dianqi, 2011
为改善变压器分接开关电场环境,笔者重点研究了变压器分接开关内酚醛压板的电场分布,利用有限元法计算了这种绝缘结构的电场,提出了结构设计的神经网络最优化方法。在神经网络最优化方式中,构建酚醛压板绝缘结构参数——电场分布的多输入—多约束输出神经网络模型,利用最优化方法构建优化算法,真正实现了酚醛压板绝缘结构的全局优化设计。结果表明,该方法对于研究多输入—多约束输出模型的全局优化设计具有普遍的指导意义。
蒋战朋, 文远芳, 范小辉
doaj  

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