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Lightweight Cross-Modal Multispectral Pedestrian Detection Based on Spatial Reweighted Attention Mechanism

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Computers, Materials & Continua 2024年第3期78卷 4071-4089页

作者： Lujuan Deng Ruochong Fu Zuhe Li boyi liu Mengze Xue Yuhao Cui School of Computer and Communication Engineering Zhengzhou University of Light IndustryZhengzhou450002China

Multispectral pedestrian detection technology leverages infrared images to provide reliable information for visible light images, demonstrating significant advantages in low-light conditions and background occlusion scenarios. However, while continuously improving cross-modal feature extraction and fusion, ensuring the model’s detection speed is also a challenging issue. We have devised a deep learning network model for cross-modal pedestrian detection based on Resnet50, aiming to focus on more reliable features and enhance the model’s detection efficiency. This model employs a spatial attention mechanism to reweight the input visible light and infrared image data, enhancing the model’s focus on different spatial positions and sharing the weighted feature data across different modalities, thereby reducing the interference of multi-modal features. Subsequently, lightweight modules with depthwise separable convolution are incorporated to reduce the model’s parameter count and computational load through channel-wise and point-wise convolutions. The network model algorithm proposed in this paper was experimentally validated on the publicly available KAIST dataset and compared with other existing methods. The experimental results demonstrate that our approach achieves favorable performance in various complex environments, affirming the effectiveness of the multispectral pedestrian detection technology proposed in this paper.

关键词： Multispectral pedestrian detection convolutional neural networks depth separable convolution spatially reweighted attention mechanism

Planform characteristics and development of inter- channel wetlands in a gravel-bed anastomosing river, Maqu Reach of the Upper Yellow River

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Journal of Geographical Sciences 2017年第11期27卷 1376-1388页

作者： liu boyi WANG Suiji Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China

Both interchannel wetlands and multi-channels are crucial geomorphologic units in an anastomosing river system. Planform characteristics and development of interchannel wetlands and multi-channels control the characteristics of anastomosing rivers. To under- stand the role that interchannel wetlands play in the development of anastomosing rivers, a study was conducted on the Maqu Reach of the Upper Yellow River （MRUYR）, a gravel-bed anastomosing river characterized by highly developed interchannel wetlands and ana- branches. Geomorphologic units in the studied reach were extracted from high resolution satellite imagery in Google Earth. The size distributions of interchannel wetlands and inter- channel wetland clusters （IWCs）, a special combination of interchannel wetlands and ana- branches, were investigated. Geomorphologic parameters, including the ratio of interchannel wetland area to IWC area （P）, shoreline density （DL）, and node density （Dn） were used to analyze planform characteristics of IWCs and the development of multi-channels in the stud- ied reach. The results suggest that small or middle sized interchannel wetlands and large or mega sized IWCs are more common at the study site. The area of IWC （Su） is highly cor- related with other geomorphologic parameters. P increases with increasing Su, and the upper limit is about 80%, which indicates that the development of interchannel wetlands and ana- branches in the IWC is in the equilibrium stage. In contrast, D~ and D, show a tendency to decrease with increasing Su due to diverse evolution processes in IWCs with different sizes. There are three main reasons leading to the formation of IWCs： varying stream power due to the meandering principal channel; development of the river corridor due to the weakening of geologic structure control; and high stability of interchannel wetlands due to conservation by shoreline vegetation.

关键词： channel planform gravel-bed anastomosing river interchannel wetland geomorphologic parameter Yellow River

COVID-19 Public Opinion and Emotion Monitoring System Based on Time Series Thermal New Word Mining

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Computers, Materials & Continua 2020年第9期64卷 1415-1434页

作者： Yixian Zhang Jieren Cheng Yifan Yang Haocheng Li Xinyi Zheng Xi Chen boyi liu Tenglong Ren Naixue Xiong School of Information and Communication Engineering Hainan UniversityHaikou570100China School of Computer Science and Cyberspace Security Hainan UniversityHaikou570100China University of Chinese Academy of Sciences Shenzhen518000China National University of Defense Technology Changsha410000China Department of Mathematics and Computer Science Northeastern State UniversityTahlequahUSA

With the spread and development of new epidemics,it is of great reference value to identify the changing trends of epidemics in public *** designed and implemented the COVID-19 public opinion monitoring system based on time series thermal new word mining.A new word structure discovery scheme based on the timing explosion of network topics and a Chinese sentiment analysis method for the COVID-19 public opinion environment are *** a“Scrapy-Redis-Bloomfilter”distributed crawler framework to collect *** system can judge the positive and negative emotions of the reviewer based on the comments,and can also reflect the depth of the seven emotions such as Hopeful,Happy,and ***,we improved the sentiment discriminant model of this system and compared the sentiment discriminant error of COVID-19 related comments with the Jiagu deep learning *** results show that our model has better generalization ability and smaller discriminant *** designed a large data visualization screen,which can clearly show the trend of public emotions,the proportion of various emotion categories,keywords,hot topics,etc.,and fully and intuitively reflect the development of public opinion.

关键词： COVID-19 public opinion monitoring data mining Chinese sentiment analysis data visualization

黄河玛曲砾质网状河段河间湿地形态特征及发育程度

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地理学报 2017年第7期72卷 1195-1206页

作者：刘博一王随继中国科学院地理科学与资源研究所中国科学院陆地水循环及地表过程重点实验室北京100101 中国科学院大学资源与环境学院北京100049

河间湿地是网状河流体系中与多河道系统同等重要的地貌单元,其特征和发育程度与河道系统共同决定着网状河流的特性。本文以黄河玛曲网状河段作为研究对象,利用高分辨率Google Earth影像对研究河段河道与河间湿地等微地貌单元进行提取,... 详细信息

河间湿地是网状河流体系中与多河道系统同等重要的地貌单元,其特征和发育程度与河道系统共同决定着网状河流的特性。本文以黄河玛曲网状河段作为研究对象,利用高分辨率Google Earth影像对研究河段河道与河间湿地等微地貌单元进行提取,利用湿地面积与湿地数对河间湿地的组成进行了分析,利用河间湿地面积占比、岸线密度、分汊点密度3个地貌参数,对河间湿地群体(河间湿地与分支河道特定组合体)的平面形态及多河道发育程度进行了研究。结果表明,河间湿地个体以中小型的为主,河间湿地群体则以大型和巨型的为主。河间湿地群体的发育程度与河间湿地群体面积(Su)明显相关,河间湿地面积占比(P)随Su的增大而增大,P值70%是河间湿地发育成熟的指标,而P值80%基本是河间湿地发育的上限值,此时河间湿地与分支河道基本达到动态平衡态。岸线密度、分汊点密度随Su的增加呈减小趋势,这种变化主要是由于不同大小河间湿地群体中河道发育过程差异导致。黄河玛曲段河间湿地群体的形成在于弯曲主河道的主导作用、地形限制因素削弱导致的河道带的发育,以及植被维护的河岸使得河间湿地群体得以较长时间保存。

关键词：河道平面形态砾质网状河河间湿地地貌参数黄河

An Improved Method for the Fitting and Prediction of the Number of COVID-19 Confirmed Cases Based on LSTM

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Computers, Materials & Continua 2020年第9期64卷 1473-1490页

作者： Bingjie Yan Jun Wang Zhen Zhang Xiangyan Tang Yize Zhou Guopeng Zheng Qi Zou Yao Lu boyi liu Wenxuan Tu Neal Xiong School of Computer Science and Cyberspace Security Hainan UniversityHaikou570228China College of Humanities and Communication Hainan UniversityHaikou570228China University of Chinese Academy of Science Beijing100049China National University of Defense Technology Changsha410073China Department of Mathematics and Computer Science Northeastern State UniversityTahlequahUSA

New coronavirus disease(COVID-19)has constituted a global pandemic and has spread to most countries and regions in the *** understanding the development trend of confirmed cases in a region,the government can control the pandemic by using the corresponding ***,the common traditional mathematical differential equations and population prediction models have limitations for time series population prediction,and even have large estimation *** address this issue,we propose an improved method for predicting confirmed cases based on LSTM(Long-Short Term Memory)neural *** work compares the deviation between the experimental results of the improved LSTM prediction model and the digital prediction models(such as Logistic and Hill equations)with the real data as ***,this work uses the goodness of fitting to evaluate the fitting effect of the *** show that the proposed approach has a smaller prediction deviation and a better fitting *** with the previous forecasting methods,the contributions of our proposed improvement methods are mainly in the following aspects:1)we have fully considered the spatiotemporal characteristics of the data,rather than single standardized data.2)the improved parameter settings and evaluation indicators are more accurate for fitting and forecasting.3)we consider the impact of the epidemic stage and conduct reasonable data processing for different stage.

关键词： COVID-19 LSTM model predictive analysis

拜登政府《临时国家安全战略指南》解读--基于话语分析的视角

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情报杂志 2021年第9期40卷 12-18页

作者：刘博怡国防科技大学国际关系学院南京210039

[目的/意义]拜登政府提前发布《临时国家安全战略指南》,传达关于美国政府对当前国际安全环境的判断。从话语分析角度解读该战略文件,有助于补充发掘拜登政府国家安全战略的新特点、新规律、新动向,补充现有研究。[方法/过程]基于话语... 详细信息

[目的/意义]拜登政府提前发布《临时国家安全战略指南》,传达关于美国政府对当前国际安全环境的判断。从话语分析角度解读该战略文件,有助于补充发掘拜登政府国家安全战略的新特点、新规律、新动向,补充现有研究。[方法/过程]基于话语分析视角,以《临时国家安全战略指南》及拜登内阁成员公开讲话作为真实语料,综合使用批评隐喻分析、社会行为者网络以及语料库辅助话语研究相结合的方法。[结果/结论]话语分析是情报分析的重要工具,解读拜登政府《临时国家安全战略指南》发现,拜登政府将强势争取世界领导地位,积极修复盟友关系,采取一切手段对抗、消减“中国对美威胁”,同时有效推动美国国内安全问题的解决。

关键词：拜登政府临时国家安全战略指南话语分析语料库

Postsplenectomy overwhelming infection:a case report

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Postsplenectomy overwhelming infection:a case report

英国学派视野下国际情报合作的动因与路径--以美印情报合作为例

中华医学会急诊医学分会第17次全国急诊医学学术年会

作者： chunfeng Sheng boyi liu Haoming Zhang Xiang Zheng Department of Intensive Care Medicine Taihe Hospital

This work aims to deepen the understanding of the pathogenesis,diagnosis,clinical char acteristics,and treatment of overwhelming postsplenectomy infection(OPSI).A case trea ted at Taihe Hospital was reported and relev...

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来源： cnki会议评论

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情报杂志 2024年第12期43卷 42-46,132页

作者：杨康刘博怡国防科技大学外国语学院南京210039 国防大学政治学院上海201602 军事科学院战争研究院北京100091

[研究目的]国际情报合作研究近年来转向拓展研究方法,使用现代案例进行经验总结或预测分析。结合国际关系理论,分析美印情报合作案例,有助于总结国际情报合作的动因和路径,并对未来美印情报合作前景进行思考。[研究方法]基于英国学派的... 详细信息

[研究目的]国际情报合作研究近年来转向拓展研究方法,使用现代案例进行经验总结或预测分析。结合国际关系理论,分析美印情报合作案例,有助于总结国际情报合作的动因和路径,并对未来美印情报合作前景进行思考。[研究方法]基于英国学派的国际社会研究视角,以美印情报合作相关事例为分析案例,综合使用解释学、实证主义等多元方法论,结合对比分析、文本细读方法。[研究结论]英国学派理论适用于情报合作研究,国际情报合作动因是共同的利益、威胁和身份,身份认同使得合作长期化;情报合作路径包括大国、均势、国际法等内容。美印情报合作间的国际法路径,可能促使双方形成长期但不牢固的情报合作关系。

关键词：情报合作英国学派美印情报合作情报合作动因情报合作路径

The curative effect of the associated cell transplantation on the rabbit myocardial infarction

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Stem Cell Discovery 2013年第4期3卷 203-210页

作者： Zhicheng Fang Chang’e Zhou Xiang Zheng boyi liu Li Chen Chunfeng Shen Pei liu Yunfei Huang Department of Intensive Care Unit Taihe Hospital Hubei Medicine University Shiyan China Department of Nephrology Taihe Hospital Hubei Medicine University Shiyan China

Inducing Mesenchymal stem cells to differentiate into cardiomyocycte-like cells and endothelial progenitor cells orientedly and evaluating the curative effect of the associated cell transplantation on the rabbit myocardial infarction (MI). Methods: Mesenchymal stem cells (MSCs) were isolated from the bone marrow of 24 rabbits and cultured in special cell culture medium containing 5-azacytidine (5-AZA), endothelial cell growth supplements (ECGS), vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (BFGF) respectively. The cell transplantation was performed 2 weeks after MI. Rabbits were divided into control group, cardiomyocytes-like cell group, endothelial progenitor cell group and combination group. We used the echocardiography to measure the heart function 2 to 4 weeks after MI, TTC to measure the area of the infarction, flow cytometry to estimate the cell apoptosis. Results: After induced, MSCs were differentiated orientedly into cardiomyocycte-like cells (CLCs) and endothelial progenitor cells (EPCs). CLCs became greater and had a “stick” or “ball” shape. Transmisson electron microscopy showed that the cells had oval nuclei positioned in the central part and well organized myofilaments, atrial granules and mitochomdrion. RT-PCR showed the expression of the atrial natriuretic polypeptide, phospholamban and myosin heavy chain in CLCs. EPCs formed confluent one-celled layer which showed a cobblestone shape by phase-contrast microscope. The expression of CD133 in EPCs was much at first and then descended gradually. Compared with the control group, cell transplantation could improve the heart function, reduce the size of MI, decrease the left ventricular end systole diameter and end diastolic diameter, suppressed cell apoptosis. The curative effect of cell transplantation was better in the associated-cell group than in the single-cell transplantation group (LVEF: 32.49% ± 1.29% vs 53.22% ± 2.13% vs 56.91% ± 2.04% vs 62.61% ± 2.37%, P < 0.05;L

关键词： Mesenchymal Stem Cell Cardiomyocycte-Like Cell Endothelial Progenitor Cell Cell Transplantation