检索结果-南通市图书馆

A rapid, low-cost deep learning system to classify strawberry disease based on cloud service

Journal of Integrative Agriculture 2022年第2期21卷 460-473页

作者： yang guo-feng yang Yong HE Zi-kang ZHANG Xin-yu HE Yong Agricultural Information Institute Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Key Laboratory of Agricultural Big Data Ministry of Agriculture and Rural AffairsBeijing 100081P.R.China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058P.R.China

Accurate and timely classification of diseases during strawberry planting can help growers deal with them in timely manner, thereby reducing losses. However, the classification of strawberry diseases in real planting environments is facing severe challenges, including complex planting environments, multiple disease categories with small differences, and so on. Although recent mobile vision technology based deep learning has achieved some success in overcoming the above problems, a key problem is how to construct a non-destructive, fast and convenient method to improve the efficiency of strawberry disease identification for the multi-region, multi-space and multi-time classification requirements. We develop and evaluate a rapid, low-cost system for classifying diseases in strawberry cultivation. This involves designing an easy-to-use cloudbased strawberry disease identification system, combined with our novel self-supervised multi-network fusion classification model, which consists of a Location network, a Feedback network and a Classification network to identify the categories of common strawberry diseases. With the help of a novel self-supervision mechanism, the model can effectively identify diseased regions of strawberry disease images without the need for annotations such as bounding boxes. Using accuracy, precision, recall and F1 to evaluate the classification effect, the results of the test set are 92.48, 90.68, 86.32 and 88.45%, respectively. Compared with popular Convolutional Neural Networks(CNN) and five other methods, our network achieves better disease classification effect. Currently, the client(mini program) has been released on the We Chat platform. The mini program has perfect classification effect in the actual test, which verifies the feasibility and effectiveness of the system, and can provide a reference for the intelligent research and application of strawberry disease identification.

关键词： deep learning strawberry disease image classification mini program cloud service

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

THE EFFECT OF WAVE GROUPINESS ON A MOORED SHIP STUDIED BY NUMERICAL SIMULATIONS

引用

Journal of Hydrodynamics 2011年第2期23卷 145-153页

作者： MA Xiao-jian SUN Zhao-chen ZHANG Zhi-ming yang guo-ping ZHOU feng State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China China Communications Planning and Design Institute for Water Transportation Beijing 100007 China

Waves with the same wave parameters, such as significant wave height and period, but with different wave groupiness factors are simulated, to study the motion behavior of a moored ship under the action of waves with different Groupiness Factors of Height （GFH） and Group Length Factors （GLF）. The numerical results show that both the sway and heave motions increase with an increase in GFH. In contrast, the influence of GLF on the motions of a moored ship is weak.

关键词： wave groupiness moored ship Groupiness Factors of Height (GFH) Group Length Factors (GLF)

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

NUMERICAL SIMULATIONS OF WATER WAVE DYNAMICS BASED ON SPH METHODS

引用

Journal of Hydrodynamics 2009年第6期21卷 843-850页

作者： ZHENG Kun SUN Zhao-chen SUN Jia-wen ZHANG Zhi-ming yang guo-ping ZHOU feng State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China CCCC Water Transportation Consultants Co. Ltd Beijing 100007 China

A numerical model was established for simulating water wave dynamic problems by adopting the Smoothed Particle Hydrodynamics （SPH） methods of iterative solution of Poisson＇s equation for pressure field, and meanwhile the sub-grid turbulence model was applied in the simulation so as to more accurately describe the turbulence characteristics at the time of wave breaking. In this article, simulation of the problem of the dam collapsing verifies the compoting accuracy of this method, and its results can be identical with the results of VOF method and the experimental results by comparison. Numerical simulations of the course of solitary wave and cnoidal wave run-up breaking on beaches were conducted, and the results are basically consistent with experimental results This indicates that the SPH method is effective for the numerical simulation of the complex problems of water wave dynamics.

关键词： Smoothed Particle Hydrodynamics (SPH) Poisson's equation water wave dynamics

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

Influence of Dry Etching Damage on the Internal Quantum Efficiency of Nanorod InGaN/GaN Multiple Quantum Wells

引用

Chinese Physics Letters 2012年第7期29卷 276-279页

作者： YU Zhi-guo CHEN Peng yang guo-feng LIU Bin XIE Zi-Li XIU Xiang-Qian WU Zhen-Long XU feng XU Zhou HUA Xue-Mei HAN Ping SHI Yi ZHANG Rong ZHENG You-Dou Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials and School of Electronic Science and Engineering Nanjing UniversityNanjing 210093 Nanjing University Institute of Optoelectronics at yangzhou Yangzhou 225009

The influence of dry etching damage on the internal quantum efficiency of InGaN/GaN nanorod multiple quantum wells (MQWs) is *** samples were etched by inductively coupled plasma (ICP) etching via a selfassembled nickel nanomask,and examined by room-temperature photoluminescence *** key parameters in the etching process are rf power and ICP *** internal quantum efficiency of nanorod MQWs shows a 5.6 times decrease substantially with the rf power increasing from 3W to ***,it is slightly influenced by the ICP power,which shows 30% variation over a wide ICP power range between 30W and *** the optimized etching condition,the internal quantum efficiency of nanorod MQWs can be 40% that of the as-grown MQW sample,and the external quantum efficiency of nanorod MQWs can be about 4 times that of the as-grown one.

关键词： InGaN/GaN measurement Efficiency

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

Enhanced Light Output of InGaN-Based Light Emitting Diodes with Roughed p-Type GaN Surface by Using Ni Nanoporous Template

引用

Chinese Physics Letters 2012年第9期29卷 219-221页

作者： YU Zhi-guo CHEN Peng yang guo-feng LIU Bin XIE Zi-Li XIU Xiang-Qian WU Zhen-Long XU feng XU Zhou HUA Xue-Mei HAN Ping SHI YiZHANG Rong ZHENG You-Dou Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials and School of Electronic Science and Engineering Nanjing UniversityNanjing 210093 Nanjing University Institute of Optoelectronics at yangzhou Yangzhou 225009

Roughened surfaces of light-emitting diodes(LEDs)provide substantial improvement in light extraction *** preparing the self-assemble nanoporous Ni template through rapid annealing of a thin Ni film,followed by a low damage dry etching process,a p-side-up LED with a roughened surface has been *** to a conventional LED with plane surface,the light output of LEDs with nanoporous p-GaN surface increases up to 71%and 36%at applied currents of 1 mA and 20 mA,***,the electrical characteristics are not degraded obviously after surface roughening.

关键词： Rough preparing template

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

Loss of p120 catenin aggravates alveolar edema of ventilation induced lung injury

引用

Chinese Medical Journal 2013年第15期126卷 2918-2922页

作者： DAI Chen-yang DAI guo-feng SUN Yu WANG Yue-lan Shandong Univ Dept Clin Med Jinan 250012 Shandong Peoples R China Shandong Univ Qilu Hosp Dept Orthoped Jinan 250012 Shandong Peoples R China Shandong Univ Sch Med Inst Pharmacol Jinan 250012 Shandong Peoples R China Shandong Univ Qianfo Mt Hosp Dept Anesthesiol Jinan 250014 Shandong Peoples R China

Background p120 catenin （p120ctn） is an adheren junction protein that regulates barrier function, but its role has not been explored in alveolar edema induced by ventilation. We measured stretch-induced cell gap formation in MLE 12 cells due to the loss of p120. We hypothesized that alveolar permeability was increased by high tung inflation associated with alveolar epithelia cell tight junctions being destroyed, which resulted from the loss of p120. Methods Cultured MLE12 cells were subjected to being stretched or un-stretched （control） and some cells were pretreated with pp2 （c-src inhibitor）. After the end of stretching for 0, 1, 2, and 4 hours, the cells were lysed, and p120 expression and c-src activation was determined by Western blotting analysis. In vivo, SD rats were taken to different tidal volumes （Vt 7 ml/kg or 40 ml/kg, PEEP=0, respiratory rate 30-40 betas/min） for 0, 1, 2, and 4 hour and some were pretreated with pp2, and alveolar edema was calculated. Rerults It was found that p120 expression was reduced and c-src activation increased in a time-dependent and strain- dependent manner due to cyclic-stretch of the alveolar epithelial cells. These changes could be reversed by inhibition of c-src. We obtained similar changes in rats when they were subjected to large tidal volumes and the alveolar edema increased more than in rats in the low Vt group. Pretreated the rats with inhibition of c-src had less pulmonary edema induced by the high tidal volume ventilation. Conclusions Cyclic stretch MLE 12 cells induced the loss of p120 and may be the same reason by high tidal volume ventilation in rats can aggravate alveolar edema. Maintenance of p120 expression may be a novel therapeutic strategy for the prevention and treatment of ventilation induced lung injury （VILI）.

关键词： mechanical ventilation adherens junction lung injury alveolar edema

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

模式识别技术在安全级电动阀故障诊断中的应用

引用

核动力工程 2010年第1期31卷 79-82,87页

作者：杨国峰胡守印上海核工程研究设计院上海200233 清华大学核能与新能源技术研究院北京100084

将安全级电动隔离阀故障检测系统实际应用于阀门的故障检测中,并利用模式识别技术对故障类型进行辨识,分析实时故障,给出辨识结果。试验表明:这种诊断方法简单、有效,对于多种故障模式有很细致的表征,对故障种类有很精确的识别。

关键词：模式识别故障诊断特征值

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

EFFECT OF HIGH TIDAL VOLUME VENTILATION AND LIPOPOLYSACCHARIDE ON MITOGEN-ACTIVATED PROTEIN KINASE IN RAT LUNG TISSUE

引用

Chinese Medical Journal 2006年第1期119卷 53-56页

作者： QIU Hai-bo LU Xiao-min ZHOU Shao-xia yang Yi guo feng-mei Department of Critical Care Medicine Zhong-da Hospital and School of Clinical Medicine Southeast University Nanjing 210009 China

Mechanical ventilation, a crucial therapy to acute respiratory distress syndrome （ARDS）,could exacerbate lung injury, and even result in ventilator-induced lung injury （VILI） if misused in some condition1. Over-activating inflammatory cells and expanding inflammatory responses, which are induced by infection, are fundamental reasons for ARDS. Among them,

关键词： mechanical ventilation high tidal volume lipopolysaccharide mitogen-activated protein kinase inflammatory mediator

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

Ship Appearance Optimal Design on RCS Reduction Using Response Surface Method and Genetic Algorithms

引用

Journal of Shanghai Jiaotong university(Science) 2008年第3期13卷 336-342页

作者：杨德庆郭凤骏 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University

Radar cross section (RCS) reduction technologies are very important in survivability of the military naval vessels. Ship appearance shaping as an effective countermeasure of RCS reduction redirects the scattered energy from one angular region of interest in space to another region of little interest. To decrease the scattering electromagnetic signals from ship scientifically, optimization methods should be introduced in shaping design. Based on the assumption of the characteristic section design method, mathematical formulations for optimal shaping design were established. Because of the computation-intensive analysis and singularity in shaping optimization, the response surface method (RSM) combined genetic algorithm (GA) was proposed. The poly-nomial response surface method was adopted in model approximation. Then genetic algorithms were employed to solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design, the superiority and effectiveness of proposed design methodology were verified.

关键词： radar cross section (RCS) characteristic section design method response surface method genetic algorithm (GA)

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

基于故障检测和可靠性约束的传感器布局优化

引用

电子学报 2006年第2期34卷 348-351页

作者：杨光刘冠军李金国杨国峰空军装备研究院雷达所环境与可靠性试验中心北京100085 国防科技大学机电工程研究所湖南长沙410073

传感器布局优化是实现机电设备机内测试(B IT)系统设计优化的重要方法之一,保证系统对检测目标具有较好的检测效能是传感器布局优化的重要约束.通过测试信息模型分析,可知传感器自身可靠性问题将会影响系统效能的实现.本文在分析传感器... 详细信息

传感器布局优化是实现机电设备机内测试(B IT)系统设计优化的重要方法之一,保证系统对检测目标具有较好的检测效能是传感器布局优化的重要约束.通过测试信息模型分析,可知传感器自身可靠性问题将会影响系统效能的实现.本文在分析传感器故障概率对测试系统故障检测效能的影响的基础上,以传感器的故障概率和最小及传感器总价格最小为优化目标,以故障检测率、故障隔离率及虚警率为约束,基于系统故障———传感器的测试信息模型,设计并构建了一个传感器布局多目标优化的非线性整数规划模型(M INLP),对其求解可得到B IT系统的传感器布局优化设计方案,并以某伺服B IT系统为例进行优化设计分析.

关键词：测试系统传感器布局故障检测可靠性

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

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：