检索结果-南通市图书馆

Energy-Efficient Federated Edge Learning with Joint Communication and Computation Design

在线全文

学校读者我要写书评

暂无评论

Journal of Communications and Information Networks 2021年第2期6卷 110-124页

作者： Xiaopeng Mo jie xu School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China School of Science and Engineering the Chinese University of Hong KongShenzhenShenzhen 518172China

This paper studies a federated edge learning system,in which an edge server coordinates a set of edge devices to train a shared machine learning(ML)model based on their locally distributed data *** the distributed training,we exploit the joint communication and computation design for improving the system energy efficiency,in which both the communication resource allocation for global ML-parameters aggregation and the computation resource allocation for locally updating ML-parameters are jointly *** particular,we consider two transmission protocols for edge devices to upload ML-parameters to edge server,based on the non-orthogonal multiple access(NOMA)and time division multiple access(TDMA),*** both protocols,we minimize the total energy consumption at all edge devices over a particular finite training duration subject to a given training accuracy,by jointly optimizing the transmission power and rates at edge devices for uploading ML-parameters and their central processing unit(CPU)frequencies for local *** propose efficient algorithms to solve the formulated energy minimization problems by using the techniques from convex *** results show that as compared to other benchmark schemes,our proposed joint communication and computation design significantly can improve the energy efficiency of the federated edge learning system,by properly balancing the energy tradeoff between communication and computation.

关键词： federated edge learning energy efficiency joint communication and computation design resource al location non-orthogonal multiple access(NOMA) optimization.

WONG-ZAKAI APPROXIMATIONS FOR STOCHASTIC VOLTERRA EQUATIONS

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

Journal of Computational Mathematics 2024年第6期42卷 1526-1553页

作者： jie xu Mingbo Zhang College of Mathematics and Information Science Henan Normal UniversityXinxiang 453007China School of Statistics and Research Center of Applied Statistics Jiangxi University of Finance and EconomicsNanchang 330013China

In this paper,we shall prove a Wong-Zakai approximation for stochastic Volterra equations under appropriate *** may apply it to a class of stochastic differential equations with the kernel of fractional Brownian motion with Hurst parameter H∈(1/2,1)and subfractional Brownian motion with Hurst parameter H∈(1/2,1).As far as we know,this is the first result on stochastic Volterra equations in this topic.

关键词： Stochastic Volterra equations Wong-Zakai approximations Fractional Brownian motion Subfractional Brownian motion Quadratic mean convergence

Emerging applications of near-infrared fluorescent metal nanoclusters for biological imaging

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

Chinese Chemical Letters 2018年第10期29卷 1436-1444页

作者： jie xu Li Shang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU) NPU-QMUL Joint Research Institute of Advanced Materials and Structures (JRI-AMAS) Northwestern Polytechnical University

Fluorescent metal nanoclusters（MNCs） have recently emerged as a novel kind of promising fluorescent probes for biological imaging because of their ultrasmall core size（〈2 nm）, strong photoluminescence,facile availability and good biocompatibility. In this review, we provide an update on recent advances in the development of near infrared（NIR）-emitting MNCs in terms of synthesis strategies and bioimaging applications. We mainly focus on the utilization of NIR-emitting MNCs（including Au, Ag, Cu and alloy NCs） either as single modal imaging（fluorescence intensity-based imaging, fluorescence lifetime imaging, two-photon imaging） probes or as multimodal imaging（such as NIR fluorescence/X-ray computed tomography/magnetic resonance imaging, NIR fluorescence/photoacoustic imaging/magnetic resonance imaging, NIR fluorescence/single photon emission computed tomography） probes in biological cells and tissues. Finally, we give a brief outlook on the future challenges and prospects of developing NIR-emitting MNCs for bioimaging.

关键词： Metal nanoclusters Fluorescent probes Cellular imaging In vivo Near-infrared

Correlation between intrinsic dipole moment and pyroelectric coefficient of Fe-Mg tourmaline

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2014年第2期21卷 105-112页

作者： Chang-chun Zhao Li-bing Liao jie Xing School of Science China University of Geosciences School of Materials Science and Technology China University of Geosciences

Single-crystal X-ray diffraction structural data of four Fe-Mg tourmalines with different Fe contents from Xinjiang, Sichuan, and Yunnan Provinces, China, were collected at room temperature and-100oC. The intrinsic dipole moments of polyhedra and the total intrinsic dipole moment of the unit cell were calculated. By comparing the intrinsic electric dipole moments of the X, Y, Z, T, and B site polyhedra, it is found that the T site polyhedron makes the greatest contribution to the total intrinsic dipole moment. The pyroelectric coefficients of four Fe-Mg tourmalines were experimentally determined, and the influence of intrinsic dipole moments on their pyroelectric properties was inves-tigated. The experimental results show that, compared with the case at room temperature, the intrinsic dipole moments change with the total Fe content at-100oC in a completely different way. With the decrease of temperature, the total intrinsic dipole moments of tourmaline de-crease. Over the same temperature interval, the pyroelectric coefficients increase with the increase in intrinsic dipole moment.

关键词： tourmaline pyroelectricity dipole moment polyhedra

Robust Video Watermarking Using a Hybrid DCT-DWT Approach

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2020年第2期18卷 179-189页

作者： jie Sang Qi Liu chun-Lin Song School of Computer Science Jiangnan UniversityWuxi 214000

In order to solve the limitations of the digital video watermarking algorithm,this paper proposes a new robust video watermarking algorithm using combining discrete cosine transform(DCT)and discrete wavelet transform(DWT)*** of all,the video frames are randomly selected and then the DCT algorithm is applied to the selected video *** that,the first column of the selected video frames is scrambled using the Arnold ***,every column with 4 direct current(DC)coefficients is reshaped and transformed into four different sub-bands using the DWT ***,the watermark is embedded into the approximation(LL)*** proposed algorithm is easy to carry out because it provides random frames with no special requirements for video *** experiment results indicate that this algorithm can resist against different kinds of watermarking attacks,such as the Gaussian filter attack and sharpen *** addition,it also illustrates that the proposed algorithm has a better result than some other watermarking algorithms.

关键词： Arnold Hybrid DCT

Methods for the construction of DEMs of artificial slopes considering morphological features and semantic information

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第2期19卷 563-577页

作者： xu Yan ZHAO Ming-wei LU jie WANG chun JIANG Ling YANG Can-can HUANG Xiao-li Geographic Information and Tourism.College Chuzhou UniversityChuzhou 239000China State Key Laboratory of Resources and Environmental Information System Beijing 100101China College of Forestry Beijing Forestry UniversityBeijing 100083China

As human activities increase,artificially modified terrain is increasingly widely distributed in road,hydrological,and urban *** modified terrain plays an important role in protecting from geological disasters and in the planning and design of urban *** with natural slopes,artificial slopes have obvious morphological *** modeling methods are no longer suitable for digital elevation model(DEM)modeling of artificial slopes because they often seriously distort the DEM *** this paper,from the perspective of morphological characteristics,artificial slopes are divided into two types,namely,regular slopes and irregular slopes,based on whether the top and bottom lines of the artificial slope are ***,according to the morphological characteristics of the two types of slopes,the following DEM construction methods are designed:the first method(perpendicular+inverse distance weighted)is suitable for regular slopes,and the second method(perpendicular+high-accuracy surface modeling)is suitable for irregular ***,a DEM construction test is carried out using the artificial slopes in the study *** results show that for the regular and irregular slopes in the study area,the construction method proposed in this paper has significant advantages in morphological accuracy over the traditional method(triangulated irregular network),and the elevation accuracy method is also superior to the traditional method(using this method,the mean error and standard deviation error of the regular slope DEM are 0.08 m and 0.13 m,respectively,and those of the irregular slope DEM are 0.08 m and 0.06 m).In addition,the top lines and bottom lines can be included in the DEM construction of the background area after processing the elevation information of the boundary line to realize a smooth transition in the boundary between the artificial slope and the background area.

关键词： Artificial slopes DEM Morphological characteristics Triangulated irregular network High-accuracy surface modeling

Bi-level Optimal Planning of Voltage Regulator in Distribution Systems Considering Maximization of Incentive-based Photovoltaic Energy Integration

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2023年第6期9卷 2008-2017页

作者： xu xu Youwei Jia chun Sing Lai Minghao Wang Zhao xu Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina Department of Electrical and Electronic Engineering University Key Laboratory of Advanced Wireless Communications of Guangdong ProvinceSouthern University of Science and TechnologyShenzhen 515100China Department of Electronic and Computer Engineering Brunel Institute of Power SystemsBrunel University LondonLondonUB83PH United Kingdom Department of Electrical Engineering Shenzhen Research InstituteThe Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

This paper focuses on optimal voltage regulator(VR)planning to maximize the photovoltaic(PV)energy integration in distribution *** describe the amount of dynamic PV energy that can be integrated into the power system,the concept of PV accommodation capability(PVAC)is introduced and modeled with *** proposed planning model is formulated as a Benders decomposition based bi-level stochastic optimization *** the upper-level problem,VR planning decisions and PVAC are determined via mixed integer linear programming(MILP)before considering *** in the lower-level problem,the feasibility of first-level results is checked by critical network constraints(*** magnitude constraints and line capacity constraints)under uncertainties considered by time-varying loads and PV *** this paper,these uncertainties are represented in the form of operational scenarios,which are generated by the Gaussian copula theory and reduced by a well-studied backward-reduction *** modified IEEE 33-node distribution grid is utilized to verify the effectiveness of the proposed *** results demonstrate that a PV energy integration can be significantly enhanced after optimal voltage regulator planning.

关键词： Bi-level stochastic optimization problem critical network constraints photovoltaic energy integration uncertainties voltage regulator planning

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

基于纸基微芯片的样本前处理方法研究进展

分析测试学报 2025年第1期44卷 91-98页

作者：马亚星顾梦杰李旭东沈先涛华中科技大学同济医学院公共卫生学院湖北武汉430030

纸基微芯片(μPADs)是一种以纸质材料为基底的简易、便携式检测平台,在临床诊断、食品质量控制和环境监测等领域显示出极大的应用前景。作为快速检测平台,纸基微芯片除了需要对目标物进行快速定量,还要完成样本的前处理过程。科学家近... 详细信息

纸基微芯片(μPADs)是一种以纸质材料为基底的简易、便携式检测平台,在临床诊断、食品质量控制和环境监测等领域显示出极大的应用前景。作为快速检测平台,纸基微芯片除了需要对目标物进行快速定量,还要完成样本的前处理过程。科学家近年来开发了多种基于纸基微芯片的样本前处理方法,用于不同样本中目标物的分析。由于纸基具有强兼容性能,增强纸基芯片的样本前处理功能并将其与各种快速检测方法联用,能极大地扩展纸基微芯片的应用领域。该文对纸基微芯片的自驱动以及纸基微芯片自驱动与外驱动相结合的样本前处理方法进行了总结,概述了纸基微芯片在目标分析物提取、富集等前处理方面的研究进展,探讨了各种纸基微芯片前处理方法的优点和局限性。另外还展望了纸基微芯片的发展方向—除了不断提高样品前处理能力来扩展其在样本制备中的应用,还需要开发商业化的纸基微芯片来满足各类行业的检测需求。

关键词：快速分析纸基微芯片分离驱动前处理

Subspace identification for continuous-time errors-in-variables model from sampled data

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1177-1186页

作者： Ping WU chun-jie YANG Zhi-huan SONG State Key Lab of Industrial Control Technology Zhejiang University Hangzhou 310027 China

We study the subspace identification for the continuous-time errors-in-variables model from sampled ***,the filtering approach is applied to handle the time-derivative problem inherent in continuous-time *** generalized Poisson moment functional is focused.A total least squares equation based on this filtering approach is *** by the idea of discrete-time subspace identification based on principal component analysis,we develop two algorithms to deliver consistent estimates for the continuous-time errors-in-variables model by introducing two different instrumental *** determination and other instrumental variables are *** usefulness of the proposed algorithms is illustrated through numerical simulation.

关键词： System identification Errors-in-variables Continuous-time system Subspace method