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基于时频域特征分析和ML-NN的故障电弧检测与选线
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作者 毛玉明 杨留方 +3 位作者 曹伟嘉 谢宗效 吴自玉 钟安德 《云南民族大学学报(自然科学版)》 CAS 2023年第5期601-608,共8页
针对低压配电系统方式复杂、负载种类繁多、串联故障电弧的检测难度越来越大的问题,提出了1种基于时频域特征分析和多标签神经网络(ML-NN)分类的串联故障电弧检测与选线的方法.该方法通过采集多回路负载的不同支路发生电弧时的干路电流... 针对低压配电系统方式复杂、负载种类繁多、串联故障电弧的检测难度越来越大的问题,提出了1种基于时频域特征分析和多标签神经网络(ML-NN)分类的串联故障电弧检测与选线的方法.该方法通过采集多回路负载的不同支路发生电弧时的干路电流,对其时域采取统计的方法对故障电流的方差、均值、偏度和峰度进行分析,对其频域采用小波变换的方法得到其故障电流的小波系数特征.将时频域特征作为神经网络的输入进行训练,同时采用反向传播方法来训练模型,实现故障电弧检测和故障选线.经过实验验证,故障电弧检测和选线的准确度分别达到了97.57%、99%. 展开更多
关键词 时频域特征 ml-nn 故障选线 小波变换
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基于MPI的ML-kNN算法并行 被引量:4
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作者 王进 晏世凯 +4 位作者 高延雨 金理雄 胡明星 邓欣 陈乔松 《郑州大学学报(理学版)》 CAS 北大核心 2018年第3期34-38,共5页
基于MPI将ML-kNN算法并行化,以解决多标签学习领域中的大规模分类问题,控制计算的时间开销,这也是首次将MPI应用到多标签学习领域.通过与传统的串行ML-kNN的对比实验,验证了所提方法的可行性和有效性.另外,允许数据集以特征为单位划分,... 基于MPI将ML-kNN算法并行化,以解决多标签学习领域中的大规模分类问题,控制计算的时间开销,这也是首次将MPI应用到多标签学习领域.通过与传统的串行ML-kNN的对比实验,验证了所提方法的可行性和有效性.另外,允许数据集以特征为单位划分,这使得该方法在处理高维数据时具有更大的优势. 展开更多
关键词 器学习 多标签学习 并行计算 ML-k NN MPI
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Machine Learning Technology for Evaluation of Liver Fibrosis, Inflammation Activity and Steatosis (LIVERFASt<sup>TM</sup>)
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作者 Abhishek Aravind Avinash G. Bahirvani +1 位作者 Ronald Quiambao Teresa Gonzalo 《Journal of Intelligent Learning Systems and Applications》 2020年第2期31-49,共19页
Using the latest available artificial intelligence (AI) technology, an advanced algorithm LIVERFAStTM has been used to evaluate the diagnostic accuracy of machine learning (ML) biomarker algorithms to assess liver dam... Using the latest available artificial intelligence (AI) technology, an advanced algorithm LIVERFAStTM has been used to evaluate the diagnostic accuracy of machine learning (ML) biomarker algorithms to assess liver damage. Prevalence of NAFLD (Nonalcoholic fatty liver disease) and resulting NASH (nonalcoholic steatohepatitis) are constantly increasing worldwide, creating challenges for screening as the diagnosis for NASH requires invasive liver biopsy. Key issues in NAFLD patients are the differentiation of NASH from simple steatosis and identification of advanced hepatic fibrosis. In this prospective study, the staging of three different lesions of the liver to diagnose fatty liver was analyzed using a proprietary ML algorithm LIVERFAStTM developed with a database of 2862 unique medical assessments of biomarkers, where 1027 assessments were used to train the algorithm and 1835 constituted the validation set. Data of 13,068 patients who underwent the LIVERFAStTM test for evaluation of fatty liver disease were analysed. Data evaluation revealed 11% of the patients exhibited significant fibrosis with fibrosis scores 0.6 - 1.00. Approximately 7% of the population had severe hepatic inflammation. Steatosis was observed in most patients, 63%, whereas severe steatosis S3 was observed in 20%. Using modified SAF (Steatosis, Activity and Fibrosis) scores obtained using the LIVERFAStTM algorithm, NAFLD was detected in 13.41% of the patients (Sx > 0, Ay 0). Approximately 1.91% (Sx > 0, Ay = 2, Fz > 0) of the patients showed NAFLD or NASH scorings while 1.08% had confirmed NASH (Sx > 0, Ay > 2, Fz = 1 - 2) and 1.49% had advanced NASH (Sx > 0, Ay > 2, Fz = 3 - 4). The modified SAF scoring system generated by LIVERFAStTM provides a simple and convenient evaluation of NAFLD and NASH in a cohort of Southeast Asians. This system may lead to the use of noninvasive liver tests in extended populations for more accurate diagnosis of liver pathology, prediction of clinical path of individuals at all stages of liver diseases, and provision of an efficient system for therapeutic interventions. 展开更多
关键词 Machine Learning (ML) Artificial Intelligence (AI) Neural Networks (NNs) STEATOSIS INFLAMMATION ACTIVITY Fibrosis (SAF Score) NONALCOHOLIC Fatty Liver Disease (NAFLD) Non-Alcoholic STEATOHEPATITIS (NASH)
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