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Convolution-Transformer for Image Feature Extraction

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 87-106页

作者： Lirong Yin Lei Wang Siyu Lu Ruiyang Wang Youshuai Yang Bo Yang Shan liu Ahmed AlSanad Salman A.AlQahtani zhengtong Yin Xiaolu Li Xiaobing Chen Wenfeng Zheng Department of Geography and Anthropology Louisiana State UniversityBaton RougeLA70803USA School of Automation University of Electronic Science and Technology of ChinaChengdu610054China College of Computer and Information Sciences King Saud UniversityRiyadh11574Saudi Arabia College of Resources and Environmental Engineering Key Laboratory of Karst Georesources and Environment(Guizhou University)Ministry of EducationGuiyang550025China School of Geographical Sciences Southwest UniversityChongqing400715China School of Electrical and Computer Engineering Louisiana State UniversityBaton RougeLA70803USA

This study addresses the limitations of Transformer models in image feature extraction,particularly their lack of inductive bias for visual *** to Convolutional Neural Networks(CNNs),the Transformers are more sensitive to different hyperparameters of optimizers,which leads to a lack of stability and slow *** tackle these challenges,we propose the Convolution-based Efficient Transformer Image Feature Extraction Network(CEFormer)as an enhancement of the Transformer *** model incorporates E-Attention,depthwise separable convolution,and dilated convolution to introduce crucial inductive biases,such as translation invariance,locality,and scale invariance,into the Transformer ***,we implement a lightweight convolution module to process the input images,resulting in faster convergence and improved *** results in an efficient convolution combined Transformer image feature extraction *** results on the ImageNet1k Top-1 dataset demonstrate that the proposed network achieves better accuracy while maintaining high computational *** achieves up to 85.0%accuracy across various model sizes on image classification,outperforming various baseline *** integrated into the Mask Region-ConvolutionalNeuralNetwork(R-CNN)framework as a backbone network,CEFormer outperforms other models and achieves the highest mean Average Precision(mAP)*** research presents a significant advancement in Transformer-based image feature extraction,balancing performance and computational efficiency.

关键词： Transformer E-Attention depth convolution dilated convolution CEFormer

^(18)F-prostate specific membrane antigen positron emission tomography/computerized tomography for lymph node staging in medium/high risk prostate cancer:A systematic review and meta-analysis

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Chinese Medical Journal 2024年第8期137卷 949-958页

作者： zhengtong Lv liuqi Song Miao Wang Huimin Hou Haodong Li Xuan Wang Jianye Wang Jianlong Wang Ming liu Department of Urology Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences Beijing 100730China Peking University Fifth School of Clinical Medicine Beijing 100730China Peking University China-Japan Friendship School of Clinical Medicine Beijing 100029China

Background:Lymph node staging of prostate cancer(PCa)is important for planning and monitoring of treatment.^(18)F-prostate specific membrane antigen positron emission tomography/computerized tomography(^(18)F-PSMA PET/CT)has several advantages over^(68)Ga-PSMA PET/CT,but its diagnostic value requires further *** meta-analysis focused on establishing the diagnostic utility of^(18)F-PSMA PET/CT for lymph node staging in medium/high-risk ***:We searched the EMBASE,PubMed,Cochrane library,and Web of Science databases from inception to October 1,*** cancer,^(18)F,lymph node,PSMA,and PET/CT were used as search terms and the language was limited to *** additionally performed a manual search using the reference lists of key *** and study characteristics were extracted and the QUADAS-2 tool was employed to evaluate the quality of included ***,specificity,the positive and negative likelihood ratio(PLR and NLR),diagnostic odds ratio(DOR),area under the curve(AUC),and 95%confidence interval(CI)were used to evaluate the diagnostic value of^(18)F-PSMA PET/*** 17 software was employed for calculation and statistical ***:A total of eight diagnostic tests including 734 individual samples and 6346 lymph nodes were included in this *** the patient level,the results of each consolidated summary were as follows:sensitivity of 0.57(95%CI 0.39-0.73),specificity of 0.95(95%CI 0.92-0.97),PLR of 11.2(95%CI 6.6-19.0),NLR of 0.46(95%CI 0.31-0.68),DOR of 25(95%CI 11-54),and AUC of 0.94(95%CI 0.92-0.96).At the lesion level,the results of each consolidated summary were as follows:sensitivity of 0.40(95%CI 0.21-0.62),specificity of 0.99(95%CI 0.95-1.00),PLR of 40.0(95%CI 9.1-176.3),NLR of 0.61(95%CI 0.42-0.87),DOR of 66(95%CI 14-311),and AUC of 0.86(95%CI 0.83-0.89).Conclusions:^(18)F-PSMA PET/CT showed moderate sensitivity but high specificity in lymph node staging of medium/high-risk *** diag

关键词： ^(18)F-PSMA PET/CT Diagnostic test Lymph node Meta-analysis Prostate cancer

Engineering the spectra of photon triplets generated from micro/nanofiber

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Chinese Physics B 2024年第3期33卷 408-414页

作者：瞿川郭东琴李笑笑刘振旗赵义张胜海卫正统 The College of Basic Department Information Engineering UniversityZhengzhou 450000China

Quantum light sources are the core resources for photonics-based quantum information *** investigate the spectral engineering of photon triplets generated by third-order spontaneous parametric down-conversion in micro/*** phase mismatching at one-third pump frequency gives rise to non-degenerate photon triplets,the joint spectral intensity of which has an elliptical locus with a fixed eccentricity of√6/***,we propose a frequency-division scheme to separate non-degenerate photon triplets into three channels with high heralding efficiency for the first *** an appropriate pump wavelength can compensate for the fabrication errors of micro/nanofiber and also generate narrowband,non-degenerate photon triplet sources with a high signal-to-noise ***,the long-period micro/nanofiber grating introduces a new controllable degree of freedom to tailor phase matching,resulting from the periodic oscillation of *** this scheme,the wavelength of photon triplets can be flexibly tuned using quasi-phase *** study the generation of photon triplets from this novel perspective of spectrum engineering,and we believe that this work will accelerate the practical implementation of photon triplets in quantum information processing.

关键词： photon triplets micro/nanofiber spectrum engineering

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阳山休闲农业园规划设计现状与发展策略研究

山西建筑 2016年第4期42卷 3-4页

作者：刘政通史明江南大学设计学院江苏无锡214122

以阳山休闲农业园为研究对象,通过分析上位规划与现状发展存在的偏差,探讨了休闲农业园存在的问题,依据建筑规划学与景观设计学理论,从规划设计的视角提出了阳山休闲农业园的发展策略。

关键词：休闲农业园度假片区文化特色发展策略

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煤化工灰水介质中304不锈钢的点蚀行为

机械工程材料 2017年第9期41卷 25-31页

作者：赵杰熊丹于云鹏刘正通秦凌北京石油化工学院机械工程学院北京102617 中科合成油工程股份有限公司北京101407

通过电化学试验和浸泡试验,采用动电位扫描技术、交流阻抗技术、扫描电子显微镜分析等方法研究了304不锈钢在模拟煤化工灰水介质中的点蚀行为,探讨了Cl^-、SO_4^(2-)、pH对点蚀行为的影响。结果表明:在试验条件下,随着灰水介质中Cl^-含... 详细信息

通过电化学试验和浸泡试验,采用动电位扫描技术、交流阻抗技术、扫描电子显微镜分析等方法研究了304不锈钢在模拟煤化工灰水介质中的点蚀行为,探讨了Cl^-、SO_4^(2-)、pH对点蚀行为的影响。结果表明:在试验条件下,随着灰水介质中Cl^-含量的增加,试验钢的点蚀程度增大,当Cl^-质量分数为300mg·kg^(-1)时,点蚀程度最轻;随着灰水介质中SO_4^(2-)含量的增加,试验钢的点蚀程度降低,当SO_4^(2-)质量分数为2 000mg·kg^(-1)时,点蚀程度最轻;随着灰水介质pH的增大,试验钢的点蚀程度降低,当pH为10时,点蚀程度最轻。

关键词： 304不锈钢点蚀煤化工灰水

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加工高硫高酸原油蒸馏装置的腐蚀及防护

石油化工腐蚀与防护 2016年第1期33卷 30-34页

作者：王莹赵杰刘正通北京石油化工学院北京102617

常减压蒸馏装置受原油高硫高酸化的影响,腐蚀情况日益严重,对安全生产构成威胁。针对其内部特殊的腐蚀环境,结合工程实际案例总结了主要的腐蚀影响因素,重点介绍了常顶部位和减压塔底泵的腐蚀与防护措施,并对腐蚀在线监测技术进行了阐述... 详细信息

常减压蒸馏装置受原油高硫高酸化的影响,腐蚀情况日益严重,对安全生产构成威胁。针对其内部特殊的腐蚀环境,结合工程实际案例总结了主要的腐蚀影响因素,重点介绍了常顶部位和减压塔底泵的腐蚀与防护措施,并对腐蚀在线监测技术进行了阐述,对现阶段常减压蒸馏装置防腐蚀工作的发展趋势进行了展望。

关键词：高硫高酸常减压蒸馏装置腐蚀在线监测

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压缩机管线振动机理及减振技术研究综述

化工设备与管道 2016年第2期43卷 36-42页

作者：袁伟赵杰李峰刘正通北京石油化工学院机械工程学院北京102617

压缩机作为压缩和输送一定气体的装置,在现代工业生产中应用广泛,压缩机及其管线系统的振动问题也日益引起人们的关注。从压缩机管线的振动原因、振动危害、振动控制标准几个方面对该问题进行了阐述,在此基础上,重点介绍了目前对于此类... 详细信息

压缩机作为压缩和输送一定气体的装置,在现代工业生产中应用广泛,压缩机及其管线系统的振动问题也日益引起人们的关注。从压缩机管线的振动原因、振动危害、振动控制标准几个方面对该问题进行了阐述,在此基础上,重点介绍了目前对于此类振动问题在减振技术研究方面的有效控制对策。

关键词：压缩机振动原因振动危害控制标准控制对策

改进YOLOv5s的无人机视角下小目标检测算法

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计算机工程与应用 2024年第1期60卷 110-121页

作者：刘涛高一萌柴蕊李政通辽宁工程技术大学软件学院辽宁葫芦岛125105 辽宁工程技术大学基础教学部辽宁葫芦岛125105

无人机视角的小目标图像具有目标分布密集、类别不均衡以及特征不明显的特点,导致目标检测任务中出现漏检、误检的问题。针对这些问题,提出一种改进YOLOv5s小目标检测方法,以达到提高目标检测准确率与精确度的目的。重新聚类锚框,更精... 详细信息

无人机视角的小目标图像具有目标分布密集、类别不均衡以及特征不明显的特点,导致目标检测任务中出现漏检、误检的问题。针对这些问题,提出一种改进YOLOv5s小目标检测方法,以达到提高目标检测准确率与精确度的目的。重新聚类锚框,更精确地锁定检测区域。更改骨干网络结构,在空间金字塔池化层增加卷积,保证充分获取检测目标特征。同时,将网络结构中的C3模块替换成融合通道注意力机制的轻量级SEC2f模块,以提升网络对于小目标检测的局部特征捕获能力。融合解耦检测头,结合自适应锚框计算,有效提取目标区域的特征。在相同参数、相同环境条件下,在DOTA数据集上和VisDrone数据集上检测精度分别提升6.1%、5.2%,表明改进方法在小目标检测任务上的有效性;在公开数据集voc2007+2012上做通用性对比实验,结果表明改进算法具有通用性。

关键词： YOLOv5s 聚类算法 SEC2f模块空间金字塔池化解耦检测头

改良式上颌窦内提升术在上颌磨牙区的种植应用

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口腔医学 2019年第3期39卷 223-227页

作者：杨惠民刘正彤盐城市口腔医院口腔颌面外科江苏盐城224001

目的探讨改良式上颌窦内提升术在上颌磨牙区骨量不足患者种植修复中的临床疗效。方法选择我院2012年至2016年上颌磨牙区40例牙槽骨高度不足种植患者,随机分为实验组和对照组,实验组20例采用改良式上颌窦内提升技术,同期植入20颗种植体,... 详细信息

目的探讨改良式上颌窦内提升术在上颌磨牙区骨量不足患者种植修复中的临床疗效。方法选择我院2012年至2016年上颌磨牙区40例牙槽骨高度不足种植患者,随机分为实验组和对照组,实验组20例采用改良式上颌窦内提升技术,同期植入20颗种植体,对照组20例采用传统敲击式上颌窦内提升术,同期植入20颗种植体,比较两组的随访预后,随访至少12个月。结果随访期间,两组40枚种植体均获得了良好的骨结合,种植修复取得了较好的临床效果。结论选择合适的适应证,在上颌萎缩后牙区采取改良式上颌窦内提升术同期植入种植体的方法可以取得良好的临床效果,手术简单,可应用于临床实践。

关键词：上颌窦内提升术牙种植骨移植