检索结果-南通市图书馆

Dempster-Shafer Evidence Theory and Study of Some Key Problems

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2017年第1期15卷 106-112页

作者： Ying-jin Lu jun He School of Management and Economics University of Electronic Science and Technology of ChinaChengdu 610054China

As one of the most important mathematical methods, the Dempster-Shafer（D-S）evidence theory has been widely used in date fusion, risk assessment, target identification, knowledge reasoning,and other fields. This paper summarized the development and recent studies of the explanations of D-S model, evidence combination algorithms, and the improvement of the conflict during evidence combination, and also compared all explanation models,algorithms, improvements, and their applicable conditions. We are trying to provide a reference for future research and applications through this summarization.

关键词： Bayesian reasoning belief uncertainty intuitive summarized explanation decoder applicable likelihood

Hausdorff dimensions of some irregular sets associated with β-expansions

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2016年第3期59卷 445-458页

作者： LI jin jun LI Bing School of Mathematics and Statistics Minnan Normal University School of Mathematics South China University of Technology

The Hausdorff dimensions of some refined irregular sets associated with β-expansions are determined for any β > 1. More precisely, Hausdorff dimensions of the sets {x ∈ [0, 1) :lim inf(n→∞) S_n(x, β)/n= α_1, lim sup (n→∞) S_n(x, β)/n= α_2}, α_1, α_2≥0 are obtained completely, where S_n(x, β) =sum ε_k(x, β) from k=1 to n denotes the sum of the first n digits of the β-expansion of x. As an application, we present another concise proof of that the set of points x ∈ [0, 1) satisfying lim_(n→∞) S_n(x,β)/n does not exist is of full Hausdorff dimension.

关键词： β-expansion irregular sets Hausdorff dimension

A compiled catalog of rotation measures of radio point sources

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第8期14卷 942-958页

作者： jun Xu jin-Lin Han National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

We compiled a catalog of Faraday rotation measures （RMs） for 4553 extragalactic radio point sources published in literature. These RMs were derived from multi-frequency polarization observations. The RM data are compared to those in the NRAO VLA Sky Survey （NVSS） RM catalog. We reveal a systematic uncertainty of about 10.0± 1.5rad m^-2 in the NVSS RM catalog. The Galactic foreground RM is calculated through a weighted averaging method by using the compiled RM catalog together with the NVSS RM catalog, with careful consideration of uncertainties in the RM data. The data from the catalog and the interface for the Galactic foreground RM calculations are publicly available on the webpage： http：//***/RM/.

关键词： catalogs -- polarization -- radio continuum ISM -- ISM magnetic fields

On Strong Embeddability and Finite Decomposition Complexity

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2017年第3期33卷 403-418页

作者： jun XIA Xian jin WANG College of Mathematics and Statistics Chongqing University Chongqing 401331 P. R. China

The strong embeddability is a notion of metric geometry, which is an intermediate property lying between coarse embeddability and property A. In this paper, we study the permanence properties of strong embeddability for metric spaces. We show that strong embeddability is coarsely invariant and it is closed under taking subspaces, direct products, direct limits and finite unions. Furthermore, we show that a metric space is strongly embeddable if and only if it has weak finite decomposition complexity with respect to strong embeddability.

关键词： Metric geometry strong embeddability coarse invariance permanence properties finitedecomposition complexity

Voxel-based meta-analysis of grey matter changes in Alzheimer’s disease

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2015年第1期4卷 39-47页

作者： Wen-Ying Wang jin-Tai Yu Yong Liu Rui-Hua Yin Hui-Fu Wang jun Wang Lin tan Joaquim Radua Lan tan Department of Neurology Qingdao Municipal HospitalSchool of MedicineQingdao UniversityNo.5 Donghai Middle RoadQingdaoShandong Province 266071China College of Medicine and Pharmaceutics Ocean University of ChinaQingdao 266011China Department of Neurology Qingdao Municipal HospitalNanjing Medical UniversityNanjing 266071China Brainnetome Center Institute of AutomationChinese Academy of SciencesBeijing 100190China National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Psychosis Studies Institute of PsychiatryKing’s College LondonLondonUK Research Unit FIDMAG Germanes Hospitala’ries—CIBERSAMSant Boi de LlobregatBarcelonaSpain

Background:Voxel-based morphometry(VBM)using structural brain MRI has been widely used for the assessment of impairment in Alzheimer’s disease(AD),but previous studies in VBM studies on AD remain ***:We conducted meta-analyses to integrate the reported studies to determine the consistent grey matter alterations in AD based on VBM ***:The PubMed,ISI Web of Science,EMBASE and Medline database were searched for articles between 1995 and june *** searches were also conducted,and authors of studies were contacted for additional *** were extracted from clusters with significant grey matter difference between AD patients and healthy controls(HC).Meta-analysis was performed using a new improved voxel-based meta-analytic method,Effect Size Signed Differential Mapping(ES-SDM).Results:Thirty data-sets comprising 960 subjects with AD and 1195 HC met inclusion *** matter volume(GMV)reduction at 334 coordinates in AD and no GMV increase were found in the current *** reductions in GMV were robustly localized in the limbic regions(left parahippocampl gyrus and left posterior cingulate gyrus).In addition,there were GM decreases in right fusiform gyrus and right superior frontal *** findings remain largely unchanged in the jackknife sensitivity ***:Our meta-analysis clearly identified GMV atrophy in *** findings confirm that the most prominent and replicable structural abnormalities in AD are in the limbic regions and contributes to the understanding of pathophysiology underlying AD.

关键词： Voxel-based morphometry(VBM) Alzheimer’s disease(AD) Grey matter(GM) Meta-analysis Magnetic resonance imaging(MRI) Effect size signed differential mapping(ES-SDM)

Voltage-induced material removal mechanism of copper for electrochemical-mechanical polishing applications

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

中国有色金属学会会刊：英文版 2009年第B9期19卷 262-265页

作者： Sang-jun HAN Yong-jin SEO Nano-Information Material ＆ Device Laboratory Daebul University Chonnam 526-702 Korea School of Fusion Technology Daebul University Chonnam 526-702 Korea

The current-voltage (I-V) curves, such as linear sweep voltammetry (LSV) and cyclic voltammetry (CV), were employed to evaluate the effect of electrolyte concentration on the electrochemical reaction trend. From the I-V curve, the electrochemical states of active, passive, transient and trans-passive region could be characterized. And then, the mechanism of the process of voltage-induced material removal in electrochemical mechanical polishing (ECMP) of copper was investigated. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses were used to observe the surface profile. Finally, the oxidation and reduction processes of the Cu surface were monitored by the repetition of anodic and cathodic potential from cyclic voltammetry (CV) method in acid-and alkali-based electrolyte.

关键词：电化学机械抛光材料去除机理铜电极电压诱导线性扫描伏安法扫描电子显微镜循环伏安法

On Quantitative Sphere Equivalence and Extrapolation Phenomenon

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第4期38卷 709-717页

作者： jun Xi CHEN Qing jin CHENG School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

Let X,Y be Banach *** prove that if their unit spheres S(X)and S(Y)are(α,β)-Hlder homeomorphic for someα,β∈(0,1].Then the unit spheres of Lp[Ω,μ,X)and Lq(Ω,μ,Y)are(min{p/q,α},min{q/p,β})-Hlder homeomorphic for every measure space(Ω,μ)and for every 1≤p,q<∞.In particular,the result yields an interesting application involving extrapolation phenomenon.

关键词： Banach space Hlder equivalence unit sphere Matouek’s extrapolation phenomenon

Grant-Free Random Access in Pilot-Reused Multicell Massive MIMO Systems with Backoff Mechanisms

在线全文

学校读者我要写书评

暂无评论

China Communications 2023年第9期20卷 185-195页

作者： Qi Zhang jun Zhang Shi jin Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China

Grant-free random access(RA)is attractive for future network due to the minimized access *** this paper,we investigate the grantfree RA in multicell massive multiple-input multipleoutput(MIMO)systems with pilot *** backoff mechanism,user equipments(UEs)in each cell are randomly activated,and active UEs randomly select orthogonal pilots from a predefined pilot pool,which results in a random pilot contamination among *** the help of indicators that capture the uncertainties of UE activation and pilot selection,we derive a closed-form approximation of the spectral efficiency per cell after averaging over the channel fading as well as UEs’random *** on the analysis,the optimal backoff parameter and pilot length that maximize the spectral efficiency can be *** find that the backoff mechanism is necessary for the system with large number of UEs,as it can bring significant gains on the spectral ***,as UE number grows,more backoff time is needed.

关键词： backoff mechanism grant-free RA multicell massive MIMO

Tunable absorption characteristics in multilayered structures with graphene for biosensing

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2020年第4期3卷 51-61页

作者： Li jin jun Zhou Puxiang Lai Department of Biomedical Engineering Hong Kong Polytechnic University Hong Kong P.R.China Department of Microelectronic Engineering School of Physical Science&Technology Ningbo University Ningbo 315211 ZhejiangP.R.China

Graphene derivatives,possessing strong Raman scattering and near-infrared absorption intrin-sically,have boosted many exciting biosensing *** tunability of the absorption characteristics,however,remains largely unexplored to ***,we proposed a multilayer configuration constructed by a graphene monolayer sandwiched between a buffer layer and one-dimensional photonic crystal(1DPC)to achieve tunable graphene absorption under total in-ternal reflection(TIR).It is interesting that the unique optical properties of the buffer-graphene-1DPC multilayer structure,the electromagnetically induced transparency(EIT)-like and Fano-like absorptions,can be achieved with pre-determined resonance wavelengths,and furtherly be tuned by adjusting either the structure parameters or the incident angle of *** analyses demonstrate that such EIT-and Fano-like absorptions are due to the interference of light in the multilayer structure and the complete transmission produced by the evanescent wave resonance in the *** enhanced absorptions and the huge electrical field en-hancement effect exhibit potentials for broad applications,such as photoacoustic imaging and Raman imaging.

关键词： Graphene photonic crystal electromagnetically induced transparency absorption