Results 11 to 20 of about 992,462 (157)
Jixie chuandong, 2015 针对传统遗传算法在求解非线性规划问题时局部搜索能力较弱,惩罚函数求解精度不高的缺陷,将非线性规划算法引入到遗传算法中,提出一种基于动态惩罚函数的非线性规划遗传算法,将遗传算法的全局寻优能力和非线性规划算法的局部寻优能力结合起来,并引入动态惩罚函数,根据不可行点到可行域的距离和可行度自适应的调整惩罚项的值,从而能够快速求出全局最优解。介绍了动态惩罚函数的设计、改进遗传算法的关键技术和流程。最后,以某型号汽车变速器的优化设计验证了算法的合理性。与传统遗传算法相比,改进后的遗传算法解的质量、收敛速度明显提高 ...
闫帅印 +5 more
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Guangtongxin yanjiu, 2017 在光传输网络中经常会涉及必经网络节点问题,即在选定了源端和宿端之后,还指定了必须通过的局端站点,要求建立一条最短通道的业务需求。传统的优化算法无法直接找到这样的路径。文章提出一种基于改进遗传算法的必经网络节点算法,该算法由必经点生成随机生成树,在随机生成树中选择必经节点间的两两子路,并引入子路的选择概率,借助聚类算法动态调整交叉的自适应机制提高搜索效率,从而改进遗传算法以解决必经网络节点问题。最终,经过论证及仿真表明采用该算法可以满足应用。
熊向峰, 曹东, 何双江, 胡燕
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A multidisciplinary approach to estimating wolf population size for long‐term conservation
Conservation Biology, Volume 37, Issue 6, December 2023., 2023 Abstract The wolf (Canis lupus) is among the most controversial of wildlife species. Abundance estimates are required to inform public debate and policy decisions, but obtaining them at biologically relevant scales is challenging. We developed a system for comprehensive population estimation across the Italian alpine region (100,000 km2), involving ...
Francesca Marucco +30 more
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Wildlife Letters, Volume 1, Issue 1, Page 15-22, March 2023., 2023 Image of Chinese pangolin from study areas (top left), sampling location map (top right). Median joining network of Chinese pangolin population (size of circles represents the relative frequency of that haplotype present in the population). B) Demographic history of Chinese pangolin population estimated using Bayesian skyline plot.
Prajnashree Priyambada +11 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 60, Issue 4, Page 487-493, October 2022., 2022 ABSTRACT Objective To investigate the diagnostic yield of clinical whole‐genome sequencing (WGS) in prenatally diagnosed non‐immune hydrops fetalis (NIHF). Methods This was a retrospective study of 23 fetuses with prenatally diagnosed NIHF, negative for trisomies and copy‐number variants, referred for analysis by WGS with an in‐silico panel of 281 ...
E. Westenius +4 more
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Journal of Applied Ecology, Volume 58, Issue 11, Page 2566-2578, November 2021., 2021 The development of fungicide resistance greatly threatens food security and ecological sustainability, and it is urgent need to develop agricultural practices which can ameliorate this problem. Our results show that potato crop with a genetic diversity is associated with a late blight pathogen of higher fungicide sensitivity and lower potential of ...
Li‐Na Yang +8 more
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Journal of Mathematics, Volume 2021, Issue 1, 2021., 2021 Fractional order research has interdisciplinary characteristics and has been widely used in the field of natural sciences. Therefore, fractional order research has become an important area of concern for scholars. This paper used 2854 literatures collected from China National Knowledge Infrastructure (CNKI) database from 2001 to 2020 as the data source
Yunfei Yang +4 more
wiley +1 more source
全球能源互联网, 2021 并网型微电网的混合储能容量配置方法一般仅考虑其经济性，难以解决微电网联络线功率波动问题，会对电网产生不利影响。为了权衡混合储能的经济性与联络线功率波动平抑效果，提出了基于非合作博弈的混合储能容量优化配置方法。首先，以混合储能和联络线作为参与者，建立非合作博弈模型；其次，引入入侵杂草算法中繁殖机制和变异算子改进遗传算法，并求解模型；最后，对传统多目标优化模型、单目标优化模型和非合作博弈模型的优化结果以及传统、改进遗传算法的求解结果进行对比。结果表明：参与者进行博弈时可独立且客观优化目标函数 ...
孙海霞 +4 more
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New approach for estimating risk of miscarriage after chorionic villus sampling
Ultrasound in Obstetrics &Gynecology, Volume 56, Issue 5, Page 656-663, November 2020., 2020 ABSTRACT Objective To estimate the risk of miscarriage associated with chorionic villus sampling (CVS). Methods This was a retrospective cohort study of women attending for routine ultrasound examination at 11 + 0 to 13 + 6 weeks' gestation at one of eight fetal‐medicine units in Spain, Belgium and Bulgaria, between July 2007 and June 2018.
M. M. Gil +15 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2010 提出了一种基于整体退火遗传算法的动态IR drop分析方法.该方法在经典遗传算法基础上,引入父代竞争和适应函数模拟退火处理,优化了动态分析的输入向量,加快了分析速度.实验表明,与经典遗传算法相比,该方法提高了动态IR drop分析的准确性,提高了算法收敛速度,繁殖代数平均减少了35%,分析结果改进了10%左右.
ZHOUZhi-ming(周知名) +2 more
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