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时空卷积自编码网络异常行为检测

国外电子测量技术 2020年第10期39卷 104-108页

作者：宁亚飞赵英亮吴美荣王瑞中北大学信息与通信工程学院太原030051

针对视频监控异常行为检测中行为特征提取不充分且检测效率低的问题,提出一种基于无监督的时空卷积自编码异常检测方法。首先对视频帧进行时空块处理,将只包含正常行为视频中的连续3帧图像做灰度化处理,再将3帧灰度图像作为单帧RGB图像... 详细信息

针对视频监控异常行为检测中行为特征提取不充分且检测效率低的问题,提出一种基于无监督的时空卷积自编码异常检测方法。首先对视频帧进行时空块处理,将只包含正常行为视频中的连续3帧图像做灰度化处理,再将3帧灰度图像作为单帧RGB图像不同通道上的数据输入到卷积自编码器的网络中进行训练以获得视频中正常行为的时空特征,另外,结合编码器的重构误差和相应的规则分数,基于阈值规则对异常行为进行判断。最后利用公共数据集UCSD,验证了该方法的有效性,为视频异常行为检测提供了一个新思路。

关键词：异常行为检测时空卷积卷积自编码网络重构误差

基于虚拟三角网与坡度滤波的LIDAR点云数据滤波方法的研究

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工程地球物理学报 2012年第5期9卷 624-627页

作者：宁亚飞吴笑天张海涛徐巍中国地质大学信息工程学院湖北武汉430074

LIDAR(Light Detection and Ranging)技术由于其在数据获取和处理上的高度自动化,正广泛地被应用于各种地形数据的获取。LIDAR数据是目前最为理想的生产DEM的数据源,利用机载激光雷达获取DEM数据是机载激光雷达最为直接的应用。本文提... 详细信息

LIDAR(Light Detection and Ranging)技术由于其在数据获取和处理上的高度自动化,正广泛地被应用于各种地形数据的获取。LIDAR数据是目前最为理想的生产DEM的数据源,利用机载激光雷达获取DEM数据是机载激光雷达最为直接的应用。本文提出了一种将虚拟三角网与坡度滤波相结合处理LIDAR点云数据的方法,该方法将虚拟三角网的概念用于LIDAR滤波,避免了LIDAR点云内插或者平滑造成的信息损失。在虚拟三角网中进行初始地面点的选取,再由初始地面点生成的初始表面模型,通过坡度滤波可快速提取地面点。

关键词：激光雷达虚拟三角网坡度滤波数字高程模型

Enhancing photovoltaic power prediction using a CNN-LSTM-attention hybrid model with Bayesian hyperparameter optimization

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Global Energy Interconnection 2024年第5期7卷 667-681页

作者： ning Zhou Bowen Shang Mingming Xu Lei Peng yafei Zhang State Grid Henan Electric Power Research Institute Zhengzhou450052P.R.China State Grid Henan Electric Power Corporation Zhengzhou450052P.R.China

Improving the accuracy of solar power forecasting is crucial to ensure grid stability,optimize solar power plant operations,and enhance grid dispatch *** hybrid neural network models can effectively address the complexities of environmental data and power prediction uncertainties,challenges such as labor-intensive parameter adjustments and complex optimization processes ***,this study proposed a novel approach for solar power prediction using a hybrid model(CNN-LSTM-attention)that combines a convolutional neural network(CNN),long short-term memory(LSTM),and attention *** model incorporates Bayesian optimization to refine the parameters and enhance the prediction *** prepare high-quality training data,the solar power data were first preprocessed,including feature selection,data cleaning,imputation,and *** processed data were then used to train a hybrid model based on the CNN-LSTM-attention architecture,followed by hyperparameter optimization employing Bayesian *** experimental results indicated that within acceptable model training times,the CNN-LSTM-attention model outperformed the LSTM,GRU,CNN-LSTM,CNN-LSTM with autoencoders,and parallel CNN-LSTM attention ***,following Bayesian optimization,the optimized model demonstrated significantly reduced prediction errors during periods of data volatility compared to the original model,as evidenced by MRE *** highlights the clear advantage of the optimized model in forecasting fluctuating data.

关键词： Photovoltaic power prediction CNN-LSTM-Attention Bayesian optimization

Quantifying impacts of climate and human activities on the grassland in the Three-River Headwater Region after two phases of Ecological Project

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Geography and Sustainability 2022年第2期3卷 164-176页

作者： Xiaogang ning ning Zhu yafei Liu Hao Wang Chinese Academy of Surveying&Mapping Beijing 100036China Shandong University of Science and Technology Qingdao 266590China

The Three-River Headwater Region(TRHR)of China is a typical representative of the alpine environment in the Central Asian plateau and the alpine grassland in the *** degradation is one of its serious eco-logical *** purpose of this study is to quantify the joint impacts of climate and human activities on grassland changes in TRHR after two phases of Ecological Conservation and Construction Project(Ecological Project).Grassland vegetation coverage is selected as an indicator for analyzing grassland *** adopt Sen+Mann-Kendall trend analysis,residual trend analysis and correlation analysis methods to analyze the trends in spatial-temporal changes and driving factors of grassland in TRHR from 2000 to *** results show that:(1)The grassland has been mainly restored,and the degraded grassland area only accounts for 1.66%of *** the implementation of the first phase of the Ecological Project,the percentage of restored grassland area has significantly increased from 8.82%to 24.57%,and slightly decreased during the second phase.(2)The establish-ment of national nature reserves and the implementation of the Ecological Project have changed the situation that“the grassland inside the reserve is worse than that outside the reserve”.(3)Grassland restoration is mainly af-fected by the joint effects of climate and human ***,grassland degradation is mainly affected by human activities such as overgrazing and grassland *** of these findings can enrich our under-standing of grassland restoration in *** measures have certain limitations in promoting grassland *** restoration should be considered when human beings strengthen ecological conservation and transform their production and life styles.

关键词： Three-River Headwater Region Ecological Conservation and Construction Project Grassland degradation Driving factors Human activities

Separation-enrichment method for airborne disease spores based on microfluidic chip

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International Journal of Agricultural and Biological Engineering 2021年第5期14卷 199-205页

作者： yafei Wang Xiaodong Zhang ning Yang Guoxin Ma Xiaoxue Du Hanping Mao School ofAgricultural Engineering Jiangsu UniversitZhenjiang 212013JiansiChina Key Laboratory of Moderm Agricultural Equipment and Techmology Ministry of EducationJiangsu UniversitZhenjiang 212013JiangsuChina School of Electrical and Informnation Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

Airborne diseases are likely to cause crop yield reduction,which has aroused widespread *** this study,a two-stage separation-enrichment structure microfluidic chip with a compound field for separation and enrichment of the greenhouse crops airborne disease spores directly from gas flow was *** chip is mainly composed of three parts:arc structure pretreatment channel,semicircular electrode structure and collection *** 5.1 software was used to simulate the designed microfluidic chip.30μm particles were used to represent *** spores,25μm particles were used to represent *** spores,and 16μm particles were used to represent *** *** simulation results showed that the separation and enrichment efficiency of 16μm particles,25μm particles,and 30μm particles was 88%,91%,and 94%,*** experimental verification results were observed under a *** results showed that the separation and enrichment efficiency of *** spores,*** spores and *** spores was 75.7%,83.8%and 89.4%,*** a result,the designed microfluidic chip can be used to separate and enrich the spores of airborne diseases of greenhouse crops,which can provide a basis for the research of real-time monitoring technology for greenhouse airborne diseases.

关键词： greenhouse crop disease airborne spore microfluidic chip

Temporal control of the Aux/IAA genes BnIAA32 and BnIAA34 mediates Brassica napus dual shade responses

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Journal of Integrative Plant Biology 2024年第5期66卷 928-942页

作者： yafei Li Yiyi Guo Yue Cao Pengguo Xia Dongqing Xu ning Sun Lixi Jiang Jie Dong Institute of Crop Science College of Agriculture and BiotechnologyZhejiang UniversityHangzhou 310058China Key Laboratory of Plant Secondary Metabolism and Regulation of Zhejiang Province College of Life Sciences and MedicineZhejiang Sci-TechUniversityHangzhou310018China State Key Laboratory of Crop Genetics and Germplasm Enhancement College of AgricultureNanjing Agricultural UniversityNanjing 210095China Key Laboratory of Growth Regulation and Transformation Research of Zhejiang Province School of Life SciencesWestlake UniversityHangzhou 310024China

Precise responses to changes in light quality are crucial for plant growth and *** example,hypocotyls of shade-avoiding plants typically elongate under shade *** this typical shade-avoidance response(TSR)has been studied in Arabidopsis(Arabidopsis thaliana),the molecular mechanisms underlying shade tolerance are poorly *** we report that ***(Brassica napus)seedlings exhibit dual shade *** addition to the TSR,*** seedlings also display an atypical shade response(ASR),with shorter hypocotyls upon perception of early-shade ***-wide selective sweep analysis indicated that ASR is associated with light and auxin ***,genetic studies demonstrated that phytochrome A(BnphyA)promotes ASR,whereas BnphyB inhibits *** ASR,YUCCA8 expression is activated by early-shade cues,leading to increased auxin *** inhibits hypocotyl elongation,as young *** seedlings are highly sensitive to ***,two non-canonical AUXIN/INDOLE-3-ACETIC ACID(Aux/IAA)repressor genes,BnIAA32 and BnIAA34,are expressed during this early ***32 and BnIAA34 inhibit hypocotyl elongation under shade conditions,and mutations in BnIAA32 and BnIAA34 suppress ***,our study demonstrates that the temporal expression of BnIAA32 and BnIAA34 determines the behavior of *** seedlings following shade-induced auxin biosynthesis.

关键词： Brassica napus high-density planting IAA32/34 light signal transduction shade response temporal gene expression

Detection of spores using polarization image features and BP neural network

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International Journal of Agricultural and Biological Engineering 2024年第5期17卷 213-221页

作者： yafei Wang ning Yang Guoxin Ma Mohamed Farag Taha Hanping Mao Xiaodong Zhang Qiang Shi School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Jiangsu Changdian Technology Co. Ltd.Jiangyin 214400JiangsuChina School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Department of Soil and Water Sciences Faculty of Environmental Agricultural SciencesArish UniversityNorth Sinai 45516Egypt School of Science and Technology Shanghai Open UniversityShanghai 200433China

Timely detection and control of airborne disease is important to improve productivity. This study proposed a novel approach that utilizes micro polarization image features and a backpropagation neural network (BPNN) to classify and identify airborne disease spores in a greenhouse setting. Firstly, disease spores were collected in the greenhouse, and their surface morphological parameters were analyzed. Subsequently, the micropolarization imaging system for disease spores was established, and the micropolarization images of airborne disease spores from greenhouse crops were collected. Then the micropolarization images of airborne disease spores were processed, and the image features of polarization degree and polarization angle of disease spores were extracted. Finally, a disease spore classification model based on the BPNN was ultimately developed. The results showed that the texture position of the surface of the three disease spores was inconsistent, and the texture also showed an irregular shape. Texture information was present on the longitudinal and transverse axes, with the longitudinal axis exhibiting more uneven texture information. The polarization-degree images of the three disease spores exhibit variations in their representation within the entirety of the beam information. The disease spore polarization angle image exhibited the maximum levels of contrast and entropy when the Gabor filter’s direction was set to π/15. The recognition accuracy of cucumber downy mildew spores, tomato gray mildew spores, and cucumber powdery mildew spores were 75.00%, 83.33%, and 96.67%, respectively. The average recognition accuracy of disease spores was 86.67% based on BPNN and micropolarization image features. This study can provide a novel method for the detection of plant disease spores in the greenhouse.

关键词： greenhouse spores micropolarization image BPNN image processing detection

Comparative transcriptome analysis between rhesus macaques(Macaca mulatta) and crab-eating macaques(M. fascicularis)

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Zoological Research 2024年第2期45卷 299-310页

作者： Yu-Xiang Mao Yamei Li Zikun Yang ning Xu Shilong Zhang Xuankai Wang Xiangyu Yang Qiang Sun yafei Mao Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science&Intelligence TechnologyChinese Academy of SciencesShanghai 200031China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Shanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Genetic Evolution&Animal Models Chinese Academy of SciencesKunmingYunnan 650201China Bio-X Institutes Key Laboratory for the Genetics of Developmental and Neuropsychiatric DisordersMinistry of EducationShanghai Jiao Tong UniversityShanghai 200030China Zhiyuan College Shanghai Jiao Tong UniversityShanghai 200240China Center for Genomic Research International Institutes of MedicineFourth Affiliated HospitalZhejiang UniversityYiwuZhejiang 322000China

Understanding gene expression variations between species is pivotal for deciphering the evolutionary diversity in phenotypes. Rhesus macaques(Macaca mulatta, MMU)and crab-eating macaques(M. fascicularis, MFA) serve as crucial nonhuman primate biomedical models with different phenotypes. To date, however, large-scale comparative transcriptome research between these two species has not yet been fully explored. Here, we conducted systematic comparisons utilizing newly sequenced RNA-seq data from84 samples(41 MFA samples and 43 MMU samples)encompassing 14 common tissues. Our findings revealed a small fraction of genes(3.7%) with differential expression between the two species, as well as 36.5% of genes with tissue-specific expression in both macaques. Comparison of gene expression between macaques and humans indicated that 22.6% of orthologous genes displayed differential expression in at least two tissues. Moreover,19.41% of genes that overlapped with macaque-specific structural variants showed differential expression between humans and macaques. Of these, the FAM220A gene exhibited elevated expression in humans compared to macaques due to lineage-specific duplication. In summary,this study presents a large-scale transcriptomic comparison between MMU and MFA and between macaques and humans. The discovery of gene expression variations not only enhances the biomedical utility of macaque models but also contributes to the wider field of primate genomics.

关键词： Crab-eating macaques Rhesus macaques Comparative transcriptomics Biomedical models Nonhuman primates RNA-seq Duplicated genes

A novel strategy to inhibit the reproduction and translation of hepatitis C virus

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Science China(Life Sciences) 2013年第4期56卷 293-297页

作者： DUAN AiPing ning LiMin LI Chao HOU yafei YANG NaNa SUN LiZhou LI GenXi Department of Biochemistry and State Key Laboratory of Pharmaceutical Biotechnology Nanjing University Laboratory of Biosensing Technology School of Life Sciences Shanghai University Department of Obstetrics the First Affiliated Hospital of Nanjing Medical University

Hepatitis C virus (HCV), a positive single-stranded RNA virus, is a major cause of liver disease in humans. Herein we report a novel strategy to inhibit the reproduction and translation of HCV using a short RNA, named an Additional RNA, to activate the endonuclease activity of Argonaute 2 (Ago2). In the presence of the Additional RNA, the HCV genome RNA has the requisite 12 nucleotides of base-pairing with microRNA-122. This activates the endonuclease activity of Ago2, resulting in cleavage and release of the HCV genome RNA from Ago2 and microRNA-122. The free HCV genome RNA would be susceptible to intracellular degradation, effectively inhibiting its reproduction and translation. This study presents a new method to inhibit HCV that may hold great potential for HCV treatment in the future.

关键词： hepatitis C virus reproduction and translation Argonaute 2 protein electro-analysis biosensor