检索结果-南通市图书馆

Orbital angular momentum-mediated machine learning for high-accuracy mode-feature encoding

Light(Science & Applications) 2024年第3期13卷 466-477页

作者： Xinyuan Fang Xiaonan Hu Baoli Li Hang Su ke cheng Haitao Luan Min Gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Machine learning with optical neural networks has featured unique advantages of the information processing including high speed,ultrawide bandwidths and low energy consumption because the optical dimensions(time,space,wavelength,and polarization)could be utilized to increase the degree of ***,due to the lack of the capability to extract the information features in the orbital angular momentum(OAM)domain,the theoretically unlimited OAM states have never been exploited to represent the signal of the input/output nodes in the neural network ***,we demonstrate OAM-mediated machine learning with an all-optical convolutional neural network(CNN)based on Laguerre-Gaussian(LG)beam modes with diverse diffraction *** proposed CNN architecture is composed of a trainable OAM mode-dispersion impulse as a convolutional kernel for feature extraction,and deep-learning diffractive layers as a *** resultant OAM mode-dispersion selectivity can be applied in information mode-feature encoding,leading to an accuracy as high as 97.2%for MNIST database through detecting the energy weighting coefficients of the encoded OAM modes,as well as a resistance to eavesdropping in point-to-point free-space ***,through extending the target encoded modes into multiplexed OAM states,we realize all-optical dimension reduction for anomaly detection with an accuracy of 85%.Our work provides a deep insight to the mechanism of machine learning with spatial modes basis,which can be further utilized to improve the performances of various machine-vision tasks by constructing the unsupervised learning-based auto-encoder.

关键词： polarization mode momentum

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pharmacotherapy of urethral stricture

引用

Asian Journal of Andrology 2024年第1期26卷 1-9页

作者： Hui Luo ke-cheng Lou Ling-Yu Xie Fei Zeng Jun-Rong Zou The First Clinical College Gannan Medical UniversityGanzhou 341000China Department of Urology The First Affiliated Hospital of Gannan Medical UniversityGanzhou 341000China Institute of Urology The First Affiliated Hospital of Gannan Medical UniversityGanzhou 341000China Jiangxi Engineering Technology Research Center of Calculi Prevention Ganzhou 341000China

Urethral stricture is characterized by the chronic formation of fibrous tissue,leading to the narrowing of the urethral *** the availability of various endoscopic treatments,the recurrence of urethral strictures remains a common *** pharmacotherapy targeting tissue fibrosis is a promising option for reducing recurrence *** drugs cannot replace surgery,they can be used as adjuvant therapies to improve *** this regard,many drugs have been proposed based on the mechanisms underlying the pathophysiology of urethral *** studies have obtained substantial progress in treating urethral strictures,highlighting the potential for improved drug effectiveness through appropriate clinical delivery ***,this review summarizes the latest researches on the mechanisms related to the pathophysiology of urethral stricture and the drugs to provide a theoretical basis and new insights for the effective use and future advancements in drug therapy for urethral stricture.

关键词： adjuvant therapy pathophysiology pharmacotherapy urethra urethral stricture

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Industry-Oriented Detection Method of PCBA Defects Using Semantic Segmentation Models

引用

IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1438-1446页

作者： Yang Li Xiao Wang Zhifan He Ze Wang ke cheng Sanchuan Ding Yijing Fan Xiaotao Li Yawen Niu Shanpeng Xiao Zhenqi Hao Bin Gao Huaqiang Wu Department of Internet of Things Technology and Application China Mobile Research InstituteBeijing 100053China Beijing Advanced Innovation Center for Integrated Circuits the School of Integrated CircuitTsinghua UniversityBeijing 100084China SigmaStar Technology Limited Xiamen 361199China IEEE

Automated optical inspection(AOI)is a significant process in printed circuit board assembly(PCBA)production lines which aims to detect tiny defects in *** AOI equipment has several deficiencies including low throughput,large computation cost,high latency,and poor flexibility,which limits the efficiency of online PCBA *** this paper,a novel PCBA defect detection method based on a lightweight deep convolution neural network is *** this method,the semantic segmentation model is combined with a rule-based defect recognition algorithm to build up a defect detection *** improve the performance of the model,extensive real PCBA images are collected from production lines as *** optimization methods have been applied in the model according to production demand and enable integration in lightweight computing *** results show that the production line using our method realizes a throughput more than three times higher than traditional *** method can be integrated into a lightweight inference system and pro-mote the flexibility of *** proposed method builds up a general paradigm and excellent example for model design and optimization oriented towards industrial requirements.

关键词： Automated optical inspection(AOI) deep learning defect detection printed circuit board assembly(PCBA) semantic segmentation.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

青春期骨密度变化研究进展

引用

中国儿童保健杂志 2024年第1期32卷 49-53页

作者：程轲兰莉空军军医大学唐都医院儿科陕西西安710038

骨密度是反映骨营养状况的重要指标。儿童骨密度随年龄逐渐增加,青春期骨密度累积大幅度提速,是影响峰值骨量最敏感的时期。性激素促进骨形成与骨密度获得,生长激素和胰岛素样生长因子-1分泌峰值提升骨密度累积。性早熟儿童青春期发育提... 详细信息

骨密度是反映骨营养状况的重要指标。儿童骨密度随年龄逐渐增加,青春期骨密度累积大幅度提速,是影响峰值骨量最敏感的时期。性激素促进骨形成与骨密度获得,生长激素和胰岛素样生长因子-1分泌峰值提升骨密度累积。性早熟儿童青春期发育提前,青春期时长多有缩短,带来骨量累积的改变,促性腺激素释放激素类似物(GnRHa)治疗性早熟的同时影响骨代谢。儿童25-(OH)D3水平随年龄变化呈“U形曲线”,且青春期最低。青春期骨量等体成分改变对骨健康、乃至成年体质产生长远影响。

关键词：青春期骨密度性早熟

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lithium Isotope Analytical Methods and Implications for Rare-Metal Mineralization in Granite-Pegmatite Systems: An Overview

引用

Journal of Earth Science 2024年

作者： Xiang-Ying Ye Bin Li Dong-Bo Tan ke-cheng Liu Zhi-Yong Zhu Hafiz Muhammad Siddique Yi-Lin Xiao key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Ministry of Education)， School of Geosciences and Info-physics， Central South University CAS key Laboratory of Geospace Environment and Department of Plasma Physics and Fusion Engineering， University of Science and Technology of China Institute of Geology， Chinese Academy of Geological Sciences CAS key Laboratory of Crust-Mantle Materials and Environments， School of Earth and Space Sciences， University of Science and Technology of China Chinese Academy of Sciences Center of Excellence in Comparative Planetology

The origin of highly-fractionated granite-pegmatite systems and their associated rare metal mineralization has been widely studied， but there is still ongoing debate. Prevailing hypotheses suggest that pegmatite formation and the associated rare metal mineralization are closely related to aqueous fluid processes. Lithium (Li) isotope analysis has been widely applied to trace granite-pegmatite evolution. This is because lithium is widely present in various minerals (e.g.， mica， tourmaline) that record the melt and fluid compositions， and lithium isotopes are sensitive to magmatic-hydrothermal processes. We briefly review the methodology of Li isotope analyses， the mechanisms of Li isotopic fractionation， and， in particular， Li isotope fractionation in granite-pegmatite system based on Li isotope data we have collected and the latest developments in Li isotope geochemistry. With the development of analytical technology， high-precision measurement of the Li content and isotopic compositions have facilitated a series of scientific breakthroughs in understanding the magmatic-hydrothermal evolution of rare-element ore deposits. Li isotope analysis on bulk mineral separates show ability to trace various hydrothermal processes (e.g. exotic or exsolved fluids). In situ Li isotope analysis methods has been enhanced by the development of new， homogeneous mineral reference materials. In situ SIMS and LA-MC-ICP-MS Li isotope measurements on minerals (e.g.， tourmaline) will likely become more important in studying the fluid–rock interactions in magmatic， metamorphic， and hydrothermal processes， as well as on pegmatite petrogenesis and rare-metal mineralization.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Treatment of primary nasal tuberculosis with anti-tumor necrosis factor immunotherapy:A case report

引用

World Journal of Clinical Cases 2024年第17期12卷 3271-3276页

作者： Yong-Cai Liu Min-Li Zhou ke-Jia cheng Shui-Hong Zhou Xue Wen Department of Otolaryngology The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangZhou 310003Zhejiang ProvinceChina Department of Otolaryngology The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Department of Pathology The First Affiliated HospitalMedical CollegeZhejiang UniversityHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Primary nasal tuberculosis(TB)is a rare form of extrapulmonary TB,particularly in patients receiving anti-tumor necrosis factor(TNF)*** a result,its diagnosis remains *** SUMMARY A 58-year-old male patient presented to the ear,nose,and throat department with right-sided nasal obstruction and bloody discharge for 1 *** was diagnosed with psoriatic arthritis and received anti-TNF immunotherapy for 3 years prior to *** findings revealed chronic granulomatous inammation and a few acid-fast bacilli,suggestive of primary nasal *** was referred to our TB management department for treatment with oral anti-TB *** 9 months,the nasal lesions had *** recurrence was noted during *** The diagnosis of primary nasal TB should be considered in patients receiving TNF antagonists who exhibit thickening and crusting of the nasal septum mucosa or inferior turbinate,particularly when pathological findings suggest granulomatous inflammation.

关键词： Primary nasal tuberculosis Anti-tumor necrosis factor immunotherapy Granulomatous inflammation Psoriatic arthritis acid-fast bacilli Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

方言差异与企业地理边界扩张

引用

世界经济 2024年第9期 208-232页

作者：陈勇兵程垦厦门大学经济学院厦门大学习近平新时代中国特色社会主义思想研究中心

本文使用2003-2015年工商注册企业新建分公司的数据,探讨同一地级市不同县之间的方言差异如何影响企业地理边界扩张。本文使用泊松伪最大似然估计的回归方法,结果发现,方言差异会阻碍企业地理边界扩张,经过一系列稳健性检验后,结论依然... 详细信息

本文使用2003-2015年工商注册企业新建分公司的数据,探讨同一地级市不同县之间的方言差异如何影响企业地理边界扩张。本文使用泊松伪最大似然估计的回归方法,结果发现,方言差异会阻碍企业地理边界扩张,经过一系列稳健性检验后,结论依然成立。机制分析表明,方言差异主要通过信任效应而非交流效应抑制企业地理边界扩张。更为重要的是,方言差异会更加抑制更依赖地区间相互信任的垂直型扩张、向高技能行业扩张以及向绩效异质程度更大行业的扩张,这进一步证实了信任机制的可靠性。本文还发现方言差异对小规模企业、非国有企业以及地理边界扩张经验欠缺的企业影响更大。本文基于单一国家内部的方言文化差异,从非正式制度的视角丰富了企业地理边界扩张的相关研究。

关键词：方言差异社会信任市场分割企业地理边界扩张

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

分数薛定谔方程中燕尾高斯光束的可控反转与聚焦特性

引用

中国光学（中英文） 2024年第2期17卷 481-492页

作者：黄宏伟程科杨嶒浩姚纳成都信息工程大学光电工程学院四川成都610225 电子科技大学航空航天学院四川成都610054

在光场中引入一维燕尾突变函数,利用分步傅立叶方法研究了燕尾高斯(SG)光束在分数薛定谔方程(FSE)中的演化动力学,详细讨论了线性势、抛物线势、高斯势及无势的情况。在无势情况下,SG光束会因群延迟的变化而分裂成两个子光束,并且分裂... 详细信息

在光场中引入一维燕尾突变函数,利用分步傅立叶方法研究了燕尾高斯(SG)光束在分数薛定谔方程(FSE)中的演化动力学,详细讨论了线性势、抛物线势、高斯势及无势的情况。在无势情况下,SG光束会因群延迟的变化而分裂成两个子光束,并且分裂轨迹会随着Lévy指数的增大出现弯曲。在线性势下,SG光束出现了周期性反转和聚焦行为,Lévy指数和线性势系数分别影响聚焦点峰值强度和反转及聚焦的演化周期,其反转和聚焦周期距离只受线性势影响而与Lévy指数无关。在抛物线势情况下,具有较大Lévy指数的SG光束的主瓣和旁瓣反转和聚焦从杂乱转变为周期性演化,其反转聚焦位置由抛物线势系数和Lévy指数共同决定。在高斯势中,光束的演化在势垒的约束下由于反射主瓣和旁瓣的干扰,窄势垒的周期性反转和聚焦出现杂乱混沌现象,而对于宽势垒,由于旁瓣减弱,周期性演化变得清晰。本文研究结果为利用高阶燕尾光波场实现光调制器和光开关提供了可能。

关键词：燕尾高斯光束分数薛定谔方程 Lévy指数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于DETR的3C装配场景精准视觉检测方法

引用

兵器装备工程学报 2024年第9期45卷 269-276页

作者：程轲陈雯柏刘辉翔北京信息科技大学北京100096

针对当前传统检测算法对3C智能装配场景下小尺度器件识别精度不高,在面对目标器件遮挡情况下产生漏检等问题,提出一种改进的DETR算法,通过引入多尺度特征融合网络PANet,使模型保留更多的细节和上下文信息,从而提高对小目标的感知能力,... 详细信息

针对当前传统检测算法对3C智能装配场景下小尺度器件识别精度不高,在面对目标器件遮挡情况下产生漏检等问题,提出一种改进的DETR算法,通过引入多尺度特征融合网络PANet,使模型保留更多的细节和上下文信息,从而提高对小目标的感知能力,改善小尺度器件识别精度不高的问题;针对骨干网络对多尺度特征提取能力弱,计算和参数量较大的问题,采用了ResNeSt-50骨干网络,使模型拥有更强的特征表示能力,从而改善了泛化能力以及提升了模型的效率;采用ACON自适应激活函数有效的优化了激活函数在负半轴特征信息消失的问题;最后使用Smooth-L 1 Loss可以结合Focal Loss损失函数,使模型收敛精度更高,并且有效的改善了正负样本比例不平衡的问题。在自建3C装配数据集上进行了实验对比,实验结果表明:所提算法的mAP@0.5比基准网络YOLOv5提高了4%,比YOLOv7提升了2%。

关键词：目标检测 DETR 注意力机制特征融合自适应激活

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

利用粒子群算法提高微粒粒径分布反演的精度

引用

四川大学学报（自然科学版） 2024年第2期61卷 106-112页

作者：方龙杰程科何修军成都信息工程大学光电工程学院成都610225

大气粒径分布的反演是大气科学中一个长期存在的难题,消光法是解决这一问题的有效方法 .然而,消光发中采用的线性回归,由于其核心矩阵的病态问题,影响了实际的反演效果.本文提出了一种名为粒子群优化的方法来反演粒径分布,精度比线性回... 详细信息

大气粒径分布的反演是大气科学中一个长期存在的难题,消光法是解决这一问题的有效方法 .然而,消光发中采用的线性回归,由于其核心矩阵的病态问题,影响了实际的反演效果.本文提出了一种名为粒子群优化的方法来反演粒径分布,精度比线性回归方法提高3倍以上.有效性通过仿真手段得到了验证.

关键词：粒径分布病态消光法优化

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：