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Evaluation of the McGill‐Tongji Blended Education Program for Teacher Leaders in General Practice:The importance of partnership and contextualization in International Primary Care Training Initiatives
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作者 Ziyue Wang Xinxin Zhao +14 位作者 Huixia Shen Hao Wang Gemma Cheng Ya Ning Gao Wenzhen Zuo Zhuyin Xu Francesco Avallone Anish KArora Manxi Guo Rachel Simmons David Lessard Theresa Beesley Jialin CZheng Bertrand Lebouché Howard Bergman 《Health Care Science》 2024年第4期238-248,共11页
Purpose:Strong primary health care(PHC)systems require well‐established PHC education systems to enhance the skills of general practitioners(GPs).However,the literature on the experiences of international collaborati... Purpose:Strong primary health care(PHC)systems require well‐established PHC education systems to enhance the skills of general practitioners(GPs).However,the literature on the experiences of international collaboration in primary care education in low‐and middle‐income countries remains limited.The purpose of this study was to evaluate the implementation and perceived impact of the McGill‐Tongji Blended Education Program for Teacher Leaders in General Practice(referred to as the“Tongji Program”).Methods:In 2020–2021,the McGill Department of Family Medicine(Montreal,Canada)and Tongji University School of Medicine(TUSM,Shanghai,China)jointly implemented the Tongji Program in Shanghai,China to improve the teaching capacity of PHC teachers.We conducted an exploratory longitudinal case study with a mixed methods design for the evaluation.Quantitative(QUAN)data was collected through questionnaire surveys and qualitative(QUAL)data was collected through focus group discussions.Results:The evaluation showed that learners in Tongji Program were primarily female GPs(21/22,95%)with less than 4 years of experience in teaching(16/22,73%).This program was considered a successful learning experience by most participants(19/22,86%)with higher order learning tasks such as critical thinking and problem‐solving.They also agreed that this program helped them feel more prepared to teach(21/22,95%),and developed a positive attitude toward primary care(21/22,95%).The QUAL interview revealed that both the Tongji and McGill organizers noted that TUSM showed strong leadership in organization,education,and coordination.Both students and teachers agreed that by adapting training content into contextualized delivery formats and settings,the Tongji Program successfully overcame language and technology barriers.Conclusions:Committed partnerships and contextualization were key to the success of the Tongji Program.Future research should focus on how international primary care education programs affect learners'behavior in their practice settings,and explore barriers and facilitators to change. 展开更多
关键词 primary care general practice continuing professional development contextualization international partnership
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Chinese Translation of Japanese Quotation Sentences From the Perspective of Contextual Adaptation
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作者 DING Pinyue 《Sino-US English Teaching》 2025年第2期48-52,共5页
Based on the contextual adaptation perspective of Verschueren’s Adaptation Theory,this paper explores the Chinese translation strategies of Japanese quotation sentences in the Yang translation of The Courage of One f... Based on the contextual adaptation perspective of Verschueren’s Adaptation Theory,this paper explores the Chinese translation strategies of Japanese quotation sentences in the Yang translation of The Courage of One from the perspectives of communicative context and linguistic context.The study finds that the Chinese translation of Japanese quotation sentences involves various strategies,including retaining direct quotations,converting direct quotations into statements,transforming direct quotations into attributive+noun forms,and alternating between direct and indirect quotations.This research provides a new perspective for the Chinese translation of Japanese quotation sentences and offers theoretical support for translation practices in cross-cultural communication. 展开更多
关键词 contextual adaptation communicative context direct quotation
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MMHCA:Multi-feature representations based on multi-scale hierarchical contextual aggregation for UAV-view geo-localization
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作者 Nanhua CHEN Tai-shan LOU Liangyu ZHAO 《Chinese Journal of Aeronautics》 2025年第6期517-532,共16页
In global navigation satellite system denial environment,cross-view geo-localization based on image retrieval presents an exceedingly critical visual localization solution for Unmanned Aerial Vehicle(UAV)systems.The e... In global navigation satellite system denial environment,cross-view geo-localization based on image retrieval presents an exceedingly critical visual localization solution for Unmanned Aerial Vehicle(UAV)systems.The essence of cross-view geo-localization resides in matching images containing the same geographical targets from disparate platforms,such as UAV-view and satellite-view images.However,images of the same geographical targets may suffer from occlusions and geometric distortions due to variations in the capturing platform,view,and timing.The existing methods predominantly extract features by segmenting feature maps,which overlook the holistic semantic distribution and structural information of objects,resulting in loss of image information.To address these challenges,dilated neighborhood attention Transformer is employed as the feature extraction backbone,and Multi-feature representations based on Multi-scale Hierarchical Contextual Aggregation(MMHCA)is proposed.In the proposed MMHCA method,the multiscale hierarchical contextual aggregation method is utilized to extract contextual information from local to global across various granularity levels,establishing feature associations of contextual information with global and local information in the image.Subsequently,the multi-feature representations method is utilized to obtain rich discriminative feature information,bolstering the robustness of model in scenarios characterized by positional shifts,varying distances,and scale ambiguities.Comprehensive experiments conducted on the extensively utilized University-1652 and SUES-200 benchmarks indicate that the MMHCA method surpasses the existing techniques.showing outstanding results in UAV localization and navigation. 展开更多
关键词 Geo-localization Image retrieval UAV Hierarchical contextual aggregation Multi-feature representations
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CPEWS:Contextual Prototype-Based End-to-End Weakly Supervised Semantic Segmentation
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作者 Xiaoyan Shao Jiaqi Han +2 位作者 Lingling Li Xuezhuan Zhao Jingjing Yan 《Computers, Materials & Continua》 2025年第4期595-617,共23页
The primary challenge in weakly supervised semantic segmentation is effectively leveraging weak annotations while minimizing the performance gap compared to fully supervised methods.End-to-end model designs have gaine... The primary challenge in weakly supervised semantic segmentation is effectively leveraging weak annotations while minimizing the performance gap compared to fully supervised methods.End-to-end model designs have gained significant attention for improving training efficiency.Most current algorithms rely on Convolutional Neural Networks(CNNs)for feature extraction.Although CNNs are proficient at capturing local features,they often struggle with global context,leading to incomplete and false Class Activation Mapping(CAM).To address these limitations,this work proposes a Contextual Prototype-Based End-to-End Weakly Supervised Semantic Segmentation(CPEWS)model,which improves feature extraction by utilizing the Vision Transformer(ViT).By incorporating its intermediate feature layers to preserve semantic information,this work introduces the Intermediate Supervised Module(ISM)to supervise the final layer’s output,reducing boundary ambiguity and mitigating issues related to incomplete activation.Additionally,the Contextual Prototype Module(CPM)generates class-specific prototypes,while the proposed Prototype Discrimination Loss and Superclass Suppression Loss guide the network’s training,(LPDL)(LSSL)effectively addressing false activation without the need for extra supervision.The CPEWS model proposed in this paper achieves state-of-the-art performance in end-to-end weakly supervised semantic segmentation without additional supervision.The validation set and test set Mean Intersection over Union(MIoU)of PASCAL VOC 2012 dataset achieved 69.8%and 72.6%,respectively.Compared with ToCo(pre trained weight ImageNet-1k),MIoU on the test set is 2.1%higher.In addition,MIoU reached 41.4%on the validation set of the MS COCO 2014 dataset. 展开更多
关键词 End-to-end weakly supervised semantic segmentation vision transformer contextual prototype class activation map
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基于Contextual Transformer的自动驾驶单目3D目标检测
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作者 厍向阳 颜唯佳 董立红 《计算机工程与应用》 CSCD 北大核心 2024年第19期178-189,共12页
针对当前单目3D目标检测中存在的漏检和多尺度目标检测效果不佳的问题,提出了一种基于Contextual Transformer的自动驾驶单目3D目标检测算法(CM-RTM3D)。在ResNet-50网络中引入Contextual Transformer(CoT),构建ResNet-Transformer架构... 针对当前单目3D目标检测中存在的漏检和多尺度目标检测效果不佳的问题,提出了一种基于Contextual Transformer的自动驾驶单目3D目标检测算法(CM-RTM3D)。在ResNet-50网络中引入Contextual Transformer(CoT),构建ResNet-Transformer架构以提取特征。设计多尺度空间感知模块(MSP),通过尺度空间响应操作改善浅层特征的丢失情况,嵌入沿水平和竖直两个空间方向的坐标注意力机制(CA),使用softmax函数生成各尺度的重要性软权重。在偏移损失中采用Huber损失函数代替L1损失函数。实验结果表明:在KITTI自动驾驶数据集上,相较于RTM3D算法,该算法在简单、中等、困难三个难度级别下,AP3D分别提升了4.84、3.82、5.36个百分点,APBEV分别提升了4.75、6.26、3.56个百分点。 展开更多
关键词 自动驾驶 单目3D目标检测 contextual Transformer 多尺度感知 坐标注意力机制
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融合MobileNet与Contextual Transformer的人脸识别研究 被引量:1
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作者 陈经纬 熊继平 程汉权 《智能计算机与应用》 2024年第3期61-66,共6页
FaceNet作为人脸识别的一大跨越,以其高精度、低硬件配置等优势被广泛应用于各个人脸识别相关领域。本文开源了首个餐厅支付场景下的中国人脸数据集CN-Face,该数据集拥有13000人的人脸图像,总计100000张。此外,本文以CA-SIA-WebFace作... FaceNet作为人脸识别的一大跨越,以其高精度、低硬件配置等优势被广泛应用于各个人脸识别相关领域。本文开源了首个餐厅支付场景下的中国人脸数据集CN-Face,该数据集拥有13000人的人脸图像,总计100000张。此外,本文以CA-SIA-WebFace作为训练集,利用改进后的MobileNet主干网络,采取不同的注意力机制添加方法,改变激活函数并且融入Contextual Transformer模块,大大降低了参数量和识别速度,显著提升了人脸识别精度。相较于原版FaceNet,在LFW测试集下,准确率达到98.79%,提升了2.74%,在CN-Face数据集中准确率达到95.22%,提升了1.35%。 展开更多
关键词 ECA注意力机制 人脸识别 FaceNet 深度学习 contextual Transformer
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Resilience, the 6th Vital Sign: Conceptualizing, Contextualizing, and Operationalizing All Six Vital Signs
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作者 Rose E. Constantino Betty J. Braxter +9 位作者 Chi Ching Vivian Hui Larissa C. Allen Lillian J. Wolfe Katherine H. Endres Jezyl Cempron Cutamora Laurence L. Garcia Daisy R. Palompon Kathleen Thimsen Brayden N. Kameg Margarete L. Zalon 《Health》 2024年第7期657-673,共17页
There are five vital signs that healthcare providers assess: temperature, pulse, respiration, blood pressure, and pain. Normal levels for the five vital signs are published by the American Heart Association, and other... There are five vital signs that healthcare providers assess: temperature, pulse, respiration, blood pressure, and pain. Normal levels for the five vital signs are published by the American Heart Association, and other specialty organizations, however, the sixth vital sign (resilience) which adopts the measure of immune resilience is suggested in this paper. Resilience is the ability of the immune system to respond to attacks and defend effectively against infections and inflammatory stressors, and psychological resilience is the capacity to resist, adapt, recover, thrive, and grow from a challenge or a stressor. Individuals with better optimal immune resilience had better health outcomes than those with minimal immune resilience. The purpose of this paper is to conceptualize, contextualize, and operationalize all six vital signs. We suggest measuring resilience subjectively and objectively. Subjectively, use a 5-item guided interview revised from the Connor-Davidson Resilience Scale (CDRC), a scale of 10 items. The revised CDRC scale is a 5-item scale. The scale is rated on a 5-point Likert scale from 0 (not true) to 4 (true all the time). The total score ranges from 0 to 20, with higher total scores indicating greater resilience. The scale demonstrated good construct validity and internal consistency (α = 0.85) during the development of the scale. The CD-RISC had a good Cronbach’s alpha level of 0.85. The Revised CD-RISC can be completed in 2 - 4 minutes. To measure resilience objectively, we suggest using Immune Resilience (IR) levels, the level of resilience to preserve and/or rapidly restore immune resilience functions that promote disease resistance and control inflammation and other inflammatory stress. IR levels are gauged with two peripheral blood metrics that quantify the balance between CD8 and CD4 T-cell levels and gene expression signatures tracking longevity-associated immunocompetence and mortality- or entropy-associated inflammation. IR deregulation is potentially reversible by decreasing inflammatory stress. IR metrics and mechanisms have utility as vital signs and biomarkers for measuring immune health and improving health outcomes. 展开更多
关键词 CONCEPTUALIZATION contextualization OPERATIONALIZATION Body Temperature Pulse RESPIRATION Blood Pressure Pain RESILIENCE
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素养导向的试题设计:探析情境化问题的合理配置 被引量:4
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作者 祝智庭 赵晓伟 沈书生 《电化教育研究》 北大核心 2025年第3期5-12,27,共9页
2025年初,深圳南山区的小学数学期末试题因其创新性的命题风格引发社会热议。文章以该试题为窗口,透视其中的问题设置情况,以情境化问题为切入,剖析其在“教—学—评”中的功能定位。研究引入“情境信息丰度”概念,基于信息量的不同,将... 2025年初,深圳南山区的小学数学期末试题因其创新性的命题风格引发社会热议。文章以该试题为窗口,透视其中的问题设置情况,以情境化问题为切入,剖析其在“教—学—评”中的功能定位。研究引入“情境信息丰度”概念,基于信息量的不同,将试题中的情境化问题划分为贫信息问题、简信息问题和富信息问题,并在此基础上探讨其合理配置策略与设计进路。研究强调,以问题思维构建“教—学—评”一体化,建立“信息丰度—知能深度”之间的动态平衡,充分发挥简信息问题的支架作用,并通过等价情境簇优化学生的认知体验,以期为素养导向的试题设计提供参考借鉴。 展开更多
关键词 情境化问题 问题思维 核心素养 命题情境 问题情境
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The Impact of Contextual Teaching Method on Sichuan Folk Song Education and Students’Musical Expressiveness
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作者 Jing Li 《Journal of Contemporary Educational Research》 2024年第9期100-105,共6页
This study explores the application of the contextual teaching method in Sichuan folk song education and its impact on students’musical expressiveness.By incorporating contextual teaching methods in music classes,thi... This study explores the application of the contextual teaching method in Sichuan folk song education and its impact on students’musical expressiveness.By incorporating contextual teaching methods in music classes,this research investigates the effectiveness of this approach in enhancing students’understanding of Sichuan folk songs and improving their musical expressiveness and emotional expression.A mixed-method research approach is employed,utilizing classroom observations,questionnaires,interviews,and statistical analysis to assess the practical outcomes of contextual teaching in folk song education. 展开更多
关键词 contextual teaching Sichuan folk songs Musical expressiveness Music education
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Research on the Influence of Anchor Attributes on Consumers’Online Behaviors in Social E-Commerce Platforms:The Moderating Effect of Platform Contextual Factors
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作者 Xiaodong Yang Gi Young Chung 《Proceedings of Business and Economic Studies》 2024年第5期186-193,共8页
As e-commerce continues to mature,the advantages of live streaming within the industry have become increasingly apparent,offering significant growth opportunities.Social e-commerce platforms,which are user-centered,in... As e-commerce continues to mature,the advantages of live streaming within the industry have become increasingly apparent,offering significant growth opportunities.Social e-commerce platforms,which are user-centered,integrate social networks with e-commerce by leveraging social interactions to drive product sales and enhance the overall consumer shopping experience.This type of e-commerce fosters engagement and promotes products by merging online communities with shopping behavior,creating a more interactive and dynamic marketplace.It not only retains the traditional e-commerce trading and marketing functions but also adds a social dimension,making live stream anchors crucial figures connecting consumers with products.These anchors can attract consumers with their appearance and charm,and use their expertise on live streaming platforms to guide consumers by recommending live content.They can also interact with their audiences and potentially influence them to purchase the recommended goods.It is evident that the attributes of anchors in live streaming rooms significantly impact consumers’online behavior.Therefore,researching how platform contextual factors regulate consumers’online behavior is of great practical significance.This study employs multilevel regression analysis to support its hypotheses using data.The findings indicate that contextual factors of the platform significantly influence online behavior,enhancing the positive relationship between user attachment and online activities. 展开更多
关键词 Anchor attribute User attachment Consumers’online behaviors contextual factors
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中国英语口译学习者语境构建能力验证分析 被引量:1
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作者 谌莉文 赵芳贤 谢波 《外语教学》 北大核心 2025年第1期86-93,共8页
语境构建已成为当下口译语境研究的共识,但对口译学习者语境构建能力的构念效度仍缺乏评估。本文对国内4所高校312名英语口译学习者开展交传测试和问卷调查,运用AMOS建模工具,验证分析语境构建能力的要素构成和运作机理及其对口译信息... 语境构建已成为当下口译语境研究的共识,但对口译学习者语境构建能力的构念效度仍缺乏评估。本文对国内4所高校312名英语口译学习者开展交传测试和问卷调查,运用AMOS建模工具,验证分析语境构建能力的要素构成和运作机理及其对口译信息忠实度的影响。结果显示,中国英语口译学习者语境构建能力与情景融入、文化沟通、语篇推理、心理调控4个潜在变量的在线运作有关,前者对后四者的作用力呈递增趋势;同时,语境构建能力与口译信息忠实度直接正相关,4个潜在变量通过语境构建能力间接作用于口译信息忠实度。分析表明,掌握语境资源并不能自动提升传译效果,教学培训中不仅要培养学生的语境资源获取能力,更应着力培养学生语境资源运用能力,重点强化其心理调控能力训练。 展开更多
关键词 口译学习者 语境构建能力 构念效度 验证分析
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《论语》境域式表达方式及对构建我国教育学话语的启示 被引量:3
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作者 王卫华 陈丹萍 《苏州大学学报(教育科学版)》 北大核心 2025年第2期53-64,共12页
中国教育学欲构建具有特色的学术话语及体系,需要立足当下、历史和未来三个维度,遵循现实性、历史性和发展性三条原则。当前世界学术话语对存在论主要是概念式表达,我国国学经典《论语》却提供了另一种表达方式,即境域式表达。境域式表... 中国教育学欲构建具有特色的学术话语及体系,需要立足当下、历史和未来三个维度,遵循现实性、历史性和发展性三条原则。当前世界学术话语对存在论主要是概念式表达,我国国学经典《论语》却提供了另一种表达方式,即境域式表达。境域式表达通过营造态势和描述具象,使自身成为一种动态的意义生发机制,借由主体的参与而开启一个致广大而尽精微的意义空间。它还原了认识原本的发生状态,保持了生活世界的亲熟感,给予理解者自由发挥的空间。中国教育学话语或可采用境域式表达,它有利于解决当前我国教育学话语问题,在传承国学优秀传统的同时,还能够实现与世界学术话语的互补式交流。 展开更多
关键词 中国教育学 学术话语 概念式表达 境域式表达 《论语》
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基于大内核自适应融合的小目标检测算法 被引量:1
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作者 王磊 胡君红 任洋 《计算机工程》 北大核心 2025年第6期65-73,共9页
针对当前基于卷积神经网络的单阶段目标检测算法(YOLO系列、VFNet等)在高空拍摄场景下目标背景复杂、检测精度低、特征混叠等问题,提出一种端到端的目标检测算法CSPENet。首先,采用基于大内核深度卷积CSPNeXt作为模型主干,提高模型捕捉... 针对当前基于卷积神经网络的单阶段目标检测算法(YOLO系列、VFNet等)在高空拍摄场景下目标背景复杂、检测精度低、特征混叠等问题,提出一种端到端的目标检测算法CSPENet。首先,采用基于大内核深度卷积CSPNeXt作为模型主干,提高模型捕捉全局上下文的能力;其次,通过引入特征细化模块(FRM)在空间和通道维度上生成自适应权重,可有效抑制混叠特征,并在特征融合阶段添加基于移动网络的感受野注意力(RFA)机制解决大内核参数共享问题;最后,采用EIoU损失函数作为模型的回归损失函数,并拆分预测框和真实框纵横比的影响因子,以提高模型收敛速度并改善定位效果。实验结果表明,CSPENet在VisDrone-DET数据集上相对于DINO算法平均准确率均值提升4.4百分点,为小目标检测算法的研究及其应用提供新的参考方案。 展开更多
关键词 大内核 小目标 上下文信息 特征细化 自适应融合 感受野
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员工正念对工作绩效的作用效果及机制:基于元分析的证据 被引量:3
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作者 张静 孟煜 +1 位作者 张蒙 陈慧雅 《心理科学进展》 北大核心 2025年第4期647-672,I0001,共27页
为探究员工正念对工作绩效产生的影响效应、作用机制和边界条件,通过文献检索、筛选与编码,对包含220项独立研究、73899个研究样本的188篇文献进行元分析。结果表明:员工正念与任务绩效、关系绩效显著正相关,工作投入与工作倦怠在上述... 为探究员工正念对工作绩效产生的影响效应、作用机制和边界条件,通过文献检索、筛选与编码,对包含220项独立研究、73899个研究样本的188篇文献进行元分析。结果表明:员工正念与任务绩效、关系绩效显著正相关,工作投入与工作倦怠在上述关系中发挥中介作用,且相比于关系绩效,工作投入的中介作用在任务绩效方面更强。员工正念与工作投入的关系受个人主义−集体主义文化的调节,在集体主义的文化背景下,员工正念与工作投入之间的关系更强。基于元分析的研究结果为厘清员工正念与工作绩效间的关系效应提供了综合且可靠的结论,对未来员工正念与工作绩效的相关研究具有一定借鉴意义,也为组织实践中的员工绩效管理思路提供了有益参考。 展开更多
关键词 员工正念 工作投入 工作倦怠 任务绩效 关系绩效
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融合注意力和上下文信息的遥感图像小目标检测算法 被引量:2
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作者 刘赏 周煜炜 +2 位作者 代娆 董林芳 刘猛 《计算机应用》 北大核心 2025年第1期292-300,共9页
对多尺度的遥感图像进行小目标检测时,基于深度学习的目标检测算法容易出现误检和漏检的情况。这是因为此类算法的特征提取模块进行了多次的下采样操作;而且未能根据不同类别、不同尺度的目标关注所需的上下文信息。为了解决该问题,提... 对多尺度的遥感图像进行小目标检测时,基于深度学习的目标检测算法容易出现误检和漏检的情况。这是因为此类算法的特征提取模块进行了多次的下采样操作;而且未能根据不同类别、不同尺度的目标关注所需的上下文信息。为了解决该问题,提出一种融合注意力和上下文信息的遥感图像小目标检测算法ACM-YOLO(Attention-Context-Multiscale YOLO)。首先,应用细粒度的查询感知稀疏注意力以减少小目标特征信息的丢失,从而避免漏检;其次,设计局部上下文增强(LCE)函数以更好地关注不同类别的遥感目标所需的上下文信息,从而避免误检;最后,使用加权双向特征金字塔网络(BiFPN)强化特征融合模块对遥感图像小目标的多尺度特征融合能力,从而改善算法检测效果。在DOTA数据集和NWPU VHR-10数据集上进行对比实验和消融实验,以验证所提算法的有效性和泛化性。实验结果表明,在2个数据集上所提算法的平均精确率均值(mAP)分别达到了77.33%和96.12%,而相较于YOLOv5算法,召回率分别提升了10.00和7.50个百分点。可见,所提算法能有效提升mAP和召回率,减少误检和漏检。 展开更多
关键词 遥感图像 小目标检测 稀疏采样 局部上下文信息增强 多尺度特征融合
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俄苏量子力学哲学研究的独特进路 被引量:1
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作者 孙玉忠 《哲学分析》 北大核心 2025年第2期16-24,196,共10页
俄苏学者依据晚年维特根斯坦本体论语境依赖的思想,在哥本哈根正统解释的框架内提出了量子语境实在论。量子语境实在论拒绝测量中观察者意识的介入,它既承认观察者和被观察者的区别,又拒绝认知主体与认知客体的二元论,使量子力学的测量... 俄苏学者依据晚年维特根斯坦本体论语境依赖的思想,在哥本哈根正统解释的框架内提出了量子语境实在论。量子语境实在论拒绝测量中观察者意识的介入,它既承认观察者和被观察者的区别,又拒绝认知主体与认知客体的二元论,使量子力学的测量问题变成了一个伪问题。量子语境实在论允许以因果和局域的方式将量子相干性解释为语境中的相关性,消除了量子力学解释中因果关系问题的神秘性。同时,量子语境实在论关注对实在概念的正确理解,在正统解释的框架内建立起波函数与实在的关系。这一方案对量子力学解释中的重大问题均给出了不同以往的回应,凸显出俄苏量子力学哲学研究的独特性。 展开更多
关键词 量子力学哲学 量子语境实在论
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一种基于密集多尺度Unet的山区道路提取方法 被引量:1
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作者 戴激光 常嘉骏 +2 位作者 李宛潼 秦志伟 王继承 《测绘科学》 北大核心 2025年第4期92-102,共11页
针对山区道路在高分辨率遥感影像中形态结构细小、曲折,容易受到树木、房屋及阴影等遮挡分隔,且相邻地物波谱近似,往往造成错提取、漏提取的问题,该文提出了一种基于密集多尺度Unet的山区道路提取方法——DMUnet。通过引入多方向特征融... 针对山区道路在高分辨率遥感影像中形态结构细小、曲折,容易受到树木、房屋及阴影等遮挡分隔,且相邻地物波谱近似,往往造成错提取、漏提取的问题,该文提出了一种基于密集多尺度Unet的山区道路提取方法——DMUnet。通过引入多方向特征融合模块作为初始块,提高网络远程上下文信息的学习能力,帮助网络更好地适应山区道路曲率大、路况复杂的特点,有效区分山区道路与周边地物,减少了地物相似导致的漏提取;在编码器利用密集多尺度通道注意机制,实现网络中多尺度信息的自适应聚焦,增强在山区道路受到严重遮挡环境下网络模型的鲁棒性,提升模型对道路遮挡情况下的提取能力;在解码器阶段设计密集多核卷积模块,进一步整合低级语义信息和高级语义信息,帮助网络捕捉到细小的山区道路,有效减少目标细小导致的漏提取。实验结果显示,本文方法在Recall、Precision、F1和mIoU四项评价指标上均优于其他方法。 展开更多
关键词 高分辨率遥感影像 道路提取 上下文信息 特征融合 语义信息
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边缘-分割交叉引导的伪装目标检测网络
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作者 陈鹏 李旭 +1 位作者 向道岸 余肖生 《计算机科学与探索》 北大核心 2025年第4期1001-1010,共10页
基于边缘感知的模型是伪装目标检测的主流方法之一,其核心是在早期阶段输出边缘预测,能更好地定位和分割伪装目标。而在伪装目标数据集中,由于伪装目标与背景环境有很高的视觉相似性,对早期的边缘预测质量要求很高,错误的前景预测会导... 基于边缘感知的模型是伪装目标检测的主流方法之一,其核心是在早期阶段输出边缘预测,能更好地定位和分割伪装目标。而在伪装目标数据集中,由于伪装目标与背景环境有很高的视觉相似性,对早期的边缘预测质量要求很高,错误的前景预测会导致分割不完整,甚至缺失目标,进而造成伪装目标分割效果不佳。为了解决这一问题,提出了一种边缘-分割交叉引导网络ECGNet。利用ConvNeXt模型作为骨干网络,通过1×1卷积对特征通道进行统一处理,在多尺度上提取全局上下文信息。设计了一个分割诱导边缘融合模块和一个边缘感知引导完整性聚合模块交叉融合,关注伪装目标的整体结构,不断细化分割特征和边缘特征。通过引导残差通道注意模块利用这些连接和卷积更好地提取低层特征中的结构细节。在CAMO、COD10K以及NC4K数据集上的实验结果表明,ECGNet性能优于其他22个具有代表性的模型,比HitNet在S_(α)、E_(ϕ)、F^(ω)_(β)和M方面的性能平均提升了0.019、0.019、0.018和0.009。 展开更多
关键词 伪装目标检测 上下文信息 交叉细化 边缘感知
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当“多情”遇到“多变(遍)”——语境的多维属性对二语词汇习得的影响
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作者 吴诗玉 刘嵩晗 《外语与外语教学》 北大核心 2025年第1期13-25,145,共14页
在语境变异假说框架下,本研究探讨了语境的多维属性(包括语境的变异性、情感效价、唤醒度和具体性)对二语词汇习得的影响。252名高中生和大学生参加了实验,在“多篇”(不同材料)和“多遍”(相同材料)两种语境变异条件下阅读了不同情感... 在语境变异假说框架下,本研究探讨了语境的多维属性(包括语境的变异性、情感效价、唤醒度和具体性)对二语词汇习得的影响。252名高中生和大学生参加了实验,在“多篇”(不同材料)和“多遍”(相同材料)两种语境变异条件下阅读了不同情感效价、唤醒度和具体性的语篇,然后参加词形和词义测试。结果显示,词形习得不受语境变异性、语境情感和具体性的显著影响。然而,在词义习得方面,语境的变异性、情感效价、唤醒度和具体性组合形成复杂的优劣补偿和强化机制。总体来看,不管是浅层语义知识还是高级语义知识的习得,“多篇”的效果都要优于“多遍”。但是,在“多遍”条件下被试也可能因为高语境情感和高具体性而得到“补偿”,获得甚至超过在“多篇”语境之下的词义习得效果,而在“多篇”语境之下,变化语境的优势则可能因为语境情感效价高而得到放大,使得学习者获得更好的高级词汇语义的习得效果。这个结果给二语词汇习得和教学提供了重要启示。 展开更多
关键词 语境的变异性 语境的情感效价 语境的具体性 二语词汇习得
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