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核电厂CRDM运动状态异常的无监督检测方法
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作者 林蔚青 陈泽宁 +3 位作者 江灏 段鹏斌 许勇 缪希仁 《核动力工程》 北大核心 2026年第1期251-260,共10页
核电厂反应堆控制棒驱动机构(CRDM)的运动状态是否正常关乎核电厂的安全。现有CRDM运动状态异常检测方法不易辨识细微的动作异常,且受限于匮乏的真实异常样本,存在适用性不足的问题。为此,本文提出一种核电厂CRDM运动状态的无监督异常... 核电厂反应堆控制棒驱动机构(CRDM)的运动状态是否正常关乎核电厂的安全。现有CRDM运动状态异常检测方法不易辨识细微的动作异常,且受限于匮乏的真实异常样本,存在适用性不足的问题。为此,本文提出一种核电厂CRDM运动状态的无监督异常检测方法。该方法由稀疏自注意力网络(SSAN)和统计量检测(SD)2部分构成。其中,SSAN专门设计用于提取CRDM长序列电流中的关键局部和全局信息,并高效捕获电流信号的动作规律与变化模式,以精确重构CRDM电流信号。在此基础上,计算重构和实际信号的残差,利用核密度估计(KDE)寻找CRDM正常动作下的异常决策边界。根据重构残差在时域尺度的动态特性进行统计量换算,以量化CRDM在不同运动状态状况下的异常行为,增强检测结果的可解释性。利用某地区压水堆核电机组的真实数据与模拟异常样本开展实验验证,结果表明该方法可有效提取CRDM动作的时序特征以重构电流信号,进而精准辨识控制棒的运动状态异常。 展开更多
关键词 控制棒驱动机构(CRDM) 异常检测 稀疏自注意力网络(ssan) 核密度估计(KDE)算法 统计量检测(SD)
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Night Vision Object Tracking System Using Correlation Aware LSTM-Based Modified Yolo Algorithm
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作者 R.Anandha Murugan B.Sathyabama 《Intelligent Automation & Soft Computing》 SCIE 2023年第4期353-368,共16页
Improved picture quality is critical to the effectiveness of object recog-nition and tracking.The consistency of those photos is impacted by night-video systems because the contrast between high-profile items and diffe... Improved picture quality is critical to the effectiveness of object recog-nition and tracking.The consistency of those photos is impacted by night-video systems because the contrast between high-profile items and different atmospheric conditions,such as mist,fog,dust etc.The pictures then shift in intensity,colour,polarity and consistency.A general challenge for computer vision analyses lies in the horrid appearance of night images in arbitrary illumination and ambient envir-onments.In recent years,target recognition techniques focused on deep learning and machine learning have become standard algorithms for object detection with the exponential growth of computer performance capabilities.However,the iden-tification of objects in the night world also poses further problems because of the distorted backdrop and dim light.The Correlation aware LSTM based YOLO(You Look Only Once)classifier method for exact object recognition and deter-mining its properties under night vision was a major inspiration for this work.In order to create virtual target sets similar to daily environments,we employ night images as inputs;and to obtain high enhanced image using histogram based enhancement and iterative wienerfilter for removing the noise in the image.The process of the feature extraction and feature selection was done for electing the potential features using the Adaptive internal linear embedding(AILE)and uplift linear discriminant analysis(ULDA).The region of interest mask can be segmen-ted using the Recurrent-Phase Level set Segmentation.Finally,we use deep con-volution feature fusion and region of interest pooling to integrate the presently extremely sophisticated quicker Long short term memory based(LSTM)with YOLO method for object tracking system.A range of experimentalfindings demonstrate that our technique achieves high average accuracy with a precision of 99.7%for object detection of SSAN datasets that is considerably more than that of the other standard object detection mechanism.Our approach may therefore satisfy the true demands of night scene target detection applications.We very much believe that our method will help future research. 展开更多
关键词 Object monitoring night vision image ssan dataset adaptive internal linear embedding uplift linear discriminant analysis recurrent-phase level set segmentation correlation aware LSTM based yolo classifier algorithm
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“沉默的文学”与“不确定内在性”——哈桑后现代主义文艺特征透视 被引量:2
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作者 肖艳平 《太原理工大学学报(社会科学版)》 2017年第1期81-85,共5页
美国文学批评家伊哈布·哈桑通过对西方文学领域中后现代主义特征的独到剖析,赢得西方学界的首肯。他在《后现代的转向》一书中,通过分析"沉默的文学",创造了"不确定内在性"这一概念,用以概括西方后现代主义及... 美国文学批评家伊哈布·哈桑通过对西方文学领域中后现代主义特征的独到剖析,赢得西方学界的首肯。他在《后现代的转向》一书中,通过分析"沉默的文学",创造了"不确定内在性"这一概念,用以概括西方后现代主义及其文学的根本特质。这种特质彰显出后现代主义"多元对话"的倾向。 展开更多
关键词 哈桑 沉默的文学 后现代主义 不确定内在性 《芬尼根的守灵》
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