检索结果-南通市图书馆

Semi-supervised learning based hybrid beamforming under time-varying propagation environments

Digital Communications and Networks 2024年第4期10卷 1168-1177页

作者： yin long Hang Ding Simon Murphy School of Computer Science and Technology Southwest University of Science and TechnologyMianyang621000China Department of Computing Science University of AlbertaEdmontonT6G 2R3Canada

Hybrid precoding is considered as a promising low-cost technique for millimeter wave(mm-wave)massive Multi-Input Multi-Output(MIMO)*** this work,referring to the time-varying propagation circumstances,with semi-supervised Incremental Learning(IL),we propose an online hybrid beamforming ***,given the constraint of constant modulus on analog beamformer and combiner,we propose a new broadnetwork-based structure for the design model of hybrid *** with the existing network structure,the proposed network structure can achieve better transmission performance and lower ***,to enhance the efficiency of IL further,by combining the semi-supervised graph with IL,we propose a hybrid beamforming scheme based on chunk-by-chunk semi-supervised learning,where only few transmissions are required to calculate the label and all other unlabelled transmissions would also be put into a training data *** the existing single-by-single approach where transmissions during the model update are not taken into the consideration of model update,all transmissions,even the ones during the model update,would make contributions to model update in the proposed *** the model update,the amount of unlabelled transmissions is very large and they also carry some information,the prediction performance can be enhanced to some extent by these unlabelled channel *** results demonstrate the spectral efficiency of the proposed method outperforms that of the existing single-by-single ***,we prove the general complexity of the proposed method is lower than that of the existing approach and give the condition under which its absolute complexity outperforms that of the existing approach.

关键词： Hybrid beamforming Time-varying environments Broad network Semi-supervised learning Online learning

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

Polymer-based Nanogenerator for Biomedical Applications

引用

Chemical Research in Chinese Universities 2020年第1期36卷 41-54页

作者： LI Jun long yin WANG Xudong Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWisconsin 53706USA

Polymeric devices are the workhorses of modern *** one of the cutting-edge technology leveraging polymeric materials,nanogenerator that could convert micro-/nano-scale mechanical energy into electri-city based on the mechanism of piezoelectricity and triboelectricity exhibited great promise for biomedical applications,owning to the simple configuration,high efficiency,decent electrical output,biomimetic property as well as excellent *** this manuscript,the recent representative developments of NGs in biomedical applications are ***,such as working mechanisms underneath different NG prototypes are discussed,which is followed by innovative strategies endowing NG with biomimetic mechanical *** attempts to implement NG in specific biomedical fields(e.g.,power source for implantable medical devices,therapeutic electric stimulator,etc.)are introduced and *** manuscript ends up with subsection summarizing existed challenges while providing potential solutions for future NG developments in biomedical engineering.

关键词： Nanogenerator Polymeric material Biomedical application

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

Serving Our Science and Community Better

引用

植物分类学报 2008年第1期46卷 1-2页

作者： Zhi-Duan Chen yin-long Qiu

Journal of Systematics and Evolution (JSE) has just debuted with its first issue. While it continues the tradition of its predecessor, Acta Phytotaxonomica Sinica (APS), in publishing

关键词：期刊编辑出版《植物分类学报》《系统分类与进化学报》

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

Characterization of Growth Hillocks on the Surface of High-Pressure Synthetic Diamond

引用

Chinese Physics Letters 2002年第11期19卷 1707-1710页

作者： yin long-Wei Li Mu-Sen Yuan Quan Xu Bin Hao Zhao-yin College of Materials Science and Engineering Shandong University Ji'nan 250061 College of Mechanical Science and Engineering Shandong University Ji'nan 250061 National Key Laboratory for Superhard Materials Jilin University Changchun 130012

Diamond crystals, with dimensions of about 0.5-0.6mm, were synthesized in the presence of Fe-Ni and Fe-Ni-Si catalyst solvents under high-pressure-high-temperature (HPHT) conditions. The as-known dendritic pattern was clearly seen on the (111) or (100) planes of diamond single crystals grown using Fe-Ni as a catalyst solvent. However, the conventional dendritic pattern was not observed in diamonds grown in the presence of Fe-Ni-Si alloy catalyst. Trigonal-type, pyramid-type, polygonal-type and rectangular-type growth hillocks were clearly observed on the (111) and (100) surfaces of diamonds grown from the Fe-Ni-Si-C system, and the density of the hillocks is very high at some positions. Clear successive growth layers can also be found on the (111) planes of the high-pressure diamond single crystals grown in the presence of Fe-Ni-Si alloy catalyst. The growth hillocks distributed on the (111) and (100) planes of the diamonds generally occur on or near growth steps, and some of the hillocks terminate at certain solid inclusions and voids. Growth hillocks on the (111) and (100) surfaces directly indicate the spiral growth mechanism under HPHT. A possible formation process for growth hillocks is proposed.

关键词： Nickel alloys

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

Single-Shot 360-Degree Cranial Deformity Detection System Using Digital Image Correlation

引用

Journal of Beijing Institute of Technology 2022年第2期31卷 131-139页

作者： Shaogang Liu long yin Wei yin Yuzhen Zhang Chao Zuo School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory of Spectral Imaging&Intelligent Sense Nanjing 210094China Smart Computational Imaging Laboratory(SCILab) Nanjing Uni-versity of Science and TechnologyNanjing 210094China Smart Computational Imaging Research Institute(SCIRI)of Nanjing University of Science and Technology Nanjing 210019China.

In this paper,a single-shot 360-degree cranial deformity detection system using digital image correlation(DIC)is presented to quickly obtain and detect accurate 3D data of infants’*** introducing plane mirrors into a stereo 3D DIC measurement system,a multi-view 3D imaging model is established to convert 3D data from real and virtual perspectives into 360-degree 3D data of the tested infant cranium,achieving single-shot and panoramic 3D ***-imental results showed that the performance and measurement accuracy of the proposed system can meet the requirements for cranial deformity detection,which provides a fast,accurate,and low-cost solution medically.

关键词： single-shot measurement 360-degree measurement cranial deformity detection

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

Global output feedback regulation of time-varying nonlinear systems via the dual-gain method

引用

Science China(Information Sciences) 2024年第5期67卷 333-334页

作者： Xian-long yin Zong-Yao SUN Changyun WEN Institute of Automation Qufu Normal University School of Electrical and Electronic Engineering Nanyang Technological University

Notably, owing to the limited information available, the problem of output feedback stabilization/regulation for nonlinear systems has been explored based on state *** addition, the sensors accounting for state measurement could fail to detect the system states accurately due to the limitations of manufacturing techniques and instruments.

关键词： global systems method dual-gain feedback nonlinear output regulation time-varying

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

Interface Instability of Diamond Crystals at High Temperature and High Pressure

引用

Chinese Physics Letters 2002年第3期19卷 419-421页

作者： yin long-Wei Li Mu-Sen Xu Bin Cui Jian-Jun Hao Zhao-yin School of Materials Science and Engineering Shandong University and Ji'nan 250061 National Key Laboratory for Superhard Materials Jilin University Changchun 130012

Diamond growth instability at high temperature and high pressure (HPHT) has been elucidated by observing the cellular interface in diamond crystals. The HPHT diamond crystals grow layer by layer from solution of carbon in the molten catalyst. In the growth of any other crystals from solution, the growth interface is not stable and should be of the greatest significance to understand further the diamond growth mechanism. During the diamond growth, the carbon atoms are delivered to the growing diamond crystal by diffusion through a diamond crystal-solution boundary layer. In front of the boundary layer, there is a narrow constitutional supercooling zone related to the solubility difference between diamond and graphite in the molten catalyst. The diamond growth stability is broken, and the flat or planar growth interface transforms into a cellular interface due to the light supercooling. The phenomenon of solute trails in the diamonds was observed, the formation of solute trails was closely associated with the cellular interface.

关键词： Diamonds

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

The effects of Te on the performance of Mo-V catalysts prepared by hydrothermal synthesis

引用

Chinese Chemical Letters 2007年第5期18卷 585-587页

作者： Hua Chang Jiang Ling Zeng Bin long yin Zhejiang University of Science and Technology Hangzhou 310012 PR China

Some Mo-V-Te--La catalysts with varied component were prepared by hydrothermal synthesis and dried with microwave method. The component of the catalyst were greatly affected the crystal structure and Raman spectrum. The phase in the catalysts was different when the Mo, V, and Te content varied. When the catalyst containing the same Mo, V content, due to the effect of dopant of Te element （V0.07 Mo0.93）5O14 became the main phase in the catalyst. The catalyst also showed good activity for the reaction of selective oxidation propane to acrolein and acrylic acid.

关键词： Mo-V based catalysts Hydrothermal synthesis Propane Acrylic acid

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

Document-Level Neural Machine Translation with Hierarchical Modeling of Global Context

引用

Journal of Computer Science & Technology 2022年第2期37卷 295-308页

作者： Xin Tan long-yin Zhang Guo-Dong Zhou School of Computer Science and Technology Soochow UniversitySuzhou 215006China

Document-level machine translation(MT)remains challenging due to its difficulty in efficiently using documentlevel global context for *** this paper,we propose a hierarchical model to learn the global context for documentlevel neural machine translation(NMT).This is done through a sentence encoder to capture intra-sentence dependencies and a document encoder to model document-level inter-sentence consistency and *** this hierarchical architecture,we feedback the extracted document-level global context to each word in a top-down fashion to distinguish different translations of a word according to its specific surrounding ***,we explore the effect of three popular attention functions during the information backward-distribution phase to take a deep look into the global context information distribution of our *** addition,since large-scale in-domain document-level parallel corpora are usually unavailable,we use a two-step training strategy to take advantage of a large-scale corpus with out-of-domain parallel sentence pairs and a small-scale corpus with in-domain parallel document pairs to achieve the domain *** results of our model on Chinese-English and English-German corpora significantly improve the Transformer baseline by 4.5 BLEU points on average which demonstrates the effectiveness of our proposed hierarchical model in document-level NMT.

关键词： neural machine translation document-level translation global context hierarchical model

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

Experimental study and cellular automata simulation of corrosion behavior of ferritic stainless steel in molten aluminum

引用

Journal of Iron and Steel Research International 2022年第9期29卷 1485-1494页

作者： Ji-yin long Tian-tian Zhao Mei-yi Yuan Yi-tao Yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The corrosion behavior of feritic stainless steel(446)after being immersed in molten Al alloy at 750℃ for 1,2,4,and 8 h has been investigated experimentally and *** microstructure and composition distribution at the corrosion interface were characterized using the optical microscope,scanning electron microscope,and energy dispersive *** results showed that Cr and Si synergistically delay the progress of corrosion at the interface of the intermetallic compounds(IMC).In the early stage of corrosion,Si element was enriched at the interface of IMC1 and IMC2,and the diffusion channels of Al element were occupied by ***,as the corrosion progresses,Cr and Si gradually gather to form a band-like structure and coarsen,causing their hindering effect to be *** the corrosion time increases,the banded structure was further aggregated and coarsened,and the inhibitory effect of Cr and Si elements on corrosion was strongly *** addition,based on the cellular automata dynamics model of reaction-diffusion,the corrosion process of ferritic stainless steel in aluminum alloy melts was *** is demonstrated that if there is no stabilizing effect of Cr element,the thickness of IMC will be doubled.

关键词： Stainless steel Molten Al alloy Intermetallic Diffusion-Cellular automata

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：