Results 61 to 70 of about 965 (167)
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 6, Page 768-775, December 2024.Abstract Objective Lower urinary tract obstruction (LUTO) is a chronic condition with a spectrum of outcomes. It is usually suspected prenatally based on ultrasound features (USFs). Given the unknown postnatal trajectory and the potential for significant morbidity and mortality, many families choose termination of pregnancy (TOP), often based on USFs ...
J. Richter +10 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 森林碳库在全球碳循环中发挥着重要的作用。为深入了解山西省中条山区森林植被碳密度的时空动态变化及其影响因素,以2005—2015年3期国家森林资源连续清查数据为基础,通过随机森林和结构方程模型,定量研究了森林植被的碳密度以及各驱动因子对碳密度空间分布的贡献度。结果表明:(1)2005年、2010年、2015年中条山森林植被碳密度和碳储量分别为24.87,26.56,31.42 Mg C/hm2和15.89,16.00,20.15 Tg C,二者均呈持续增加趋势,年均增长率分别为2.63%和2.68%。(2)
段兰兰 +4 more
doaj
Zhongguo shiyan zhenduanxue, 2021 目的利用Firehose数据库的数据,分析与急性髓系白血病(AML)发生、发展及预后相关的分子标志物,构建基于机器学习算法的AML 1年预后模型。方法从GDC(Genomic Data Commons)的外部链接Broad Firehose数据库中下载关于AML患者的临床及转录组数据,筛选出符合要求的生存期及mRNA测序数据的病历共163例。运用R语言DESeq程序包进行差异表达基因的筛选,并应用R语言的Rattle程序包构建基于20基因的AML 1年预后生存模型。结果 EBF4、MTUS2、NT5E ...
何文君 +3 more
doaj
An intelligent lithology identification method for sandstone and mudstone strata and its applications: A case study of the Jurassic strata in the Lunnan area, Xinjiang, China [PDF]
ObjectiveLithology identification lays the foundation for fine-scale reservoir evaluation. However, traditional identification methods generally utilize the interactive relationships between only 2‒3 logging parameters, suffering from low utilization ...
Chengguang ZHANG +8 more
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Prediction method of gas emission in working face based on feature selection and BO-GBDT [PDF]
Gas emission in the working face is influenced by a variety of factors. Dimensionality reduction methods, such as Principal Component Analysis, can reduce computational resources but may alter the original feature structure, leading to a loss of some ...
MA Wenwei
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New Opportunities and Challenges for Forensic Medicine in the Era of Artificial Intelligence Technology#br# [PDF]
, 2020 Traditional forensic identification relies on forensic experts to manually extract information and provide identification opinions based on medicine, biology and other fields of knowledge combined with personal work experience, which is not only time ...
FANG Ya-ting, LAN Qiong, XIE Tong,et al.
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基于可解释性机器学习的餐厨垃圾浆液厌氧产气性能与关键影响因素
Jingshui jishu【目的】餐厨垃圾浆液厌氧消化系统因进料特征复杂、多因素动态耦合，使得其预测与调控具有较大挑战。【方法】为实现工业规模厌氧反应过程的精准管理与优化，本文收集2019年—2023年上海某工业规模厌氧反应器运行数据，分别利用随机森林、梯度提升、K邻近回归与人工神经网络(ANN)建立产气预测模型，并通过沙普利加和解释(SHAP)算法量化各输入变量对产甲烷效率的贡献与抑制作用。【结果】梯度提升模型在测试集中R 2 最高，均方误差(MSE)与平均绝对误差(MAE)最低 ...
Cui Jie, Zhang Bo, Wang Rongjian
doaj +1 more source
野生动物学报, 2020 自2018年12月至2019年3月,在黑龙江小兴安岭地区展开了西伯利亚狍(Capreolus pygargus)的适宜栖息地调查和评估。该调查采用分层抽样法,共计布设完成边长12 km×12 km的三级抽样调查单元150个,完成调查样线599条,调查面积21 600 km2。运用GIS空间分析技术和R软件随机森林模型技术对狍的栖息地适宜性进行评价,并利用最佳概率切断点划分确定狍适宜栖息地面积为34 726.6 km2,约占整个小兴安岭林区面积的47.28%。通过随机森林模型诊断 ...
王嘉文 龙泽旭 梁 鑫 李诗喆 姜广顺
doaj
Preliminary establishment of large yellow croak disease diagnosis and pre-warning system [PDF]
, 2013 大黄鱼(Larimichthyscrocea，Richardson，1846)是中国近海特有的主要经济鱼类和当前最主要的海水养殖鱼类之一，也是中国八大优势出口水产品之一。目前全国年育苗量近20亿尾，养殖产量超过7万吨，直接产值超过30亿元。但是，近年来随着鱼用抗生素等药物的滥用，养殖密度的提高，水域生态环境日益恶化，各种大黄鱼疾病频繁爆发。病害问题给大黄鱼养殖产业带来了巨大的经济损失。因此，如何有效的防治大黄鱼疾病的爆发，对该产业可持续健康发展具有重大的意义 ...
蔡晓鹏
core
Application of integrated model based on EEMD-CNN-LSTM for landslide-displacement prediction [PDF]
Objective Landslide-displacement prediction is critical when evaluating landslide stability. Despite the achievements of time-series methods based on deep-learning paradigms in predicting landslide displacement, the nonstationary, periodic, and trending
CHEN Weitao +4 more
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