检索结果-内蒙古大学图书馆

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Michael Mitchley Michael Sears Steven Damelin School of Computer Science University of the Witwatersrand Johannesburg South Africa School of Computational and Applied Mathematics University of the Witwatersrand Johannesburg South Africa Department of Mathematical Science Georgia Southern University Statesboro GA USA

A method for the automatic supervised detection of multiple mineral targets in hyperspectral mineral data is presented in this paper. The method makes use of wavelet analysis, wavelet-based denoising using thresholding of wavelet detail coefficients, and feature reduction based on sequential forward selection, which utilises an extension of receiver operating characteristic curves to fuzzy set membership in order to measure discriminating capability. The method is shown to run in time linear to the number of hyperspectral bands, per pixel. Furthermore, an extension of this method to linear unmixing is presented, based on minimising the least-squares error between abundance estimates and actual spectra by varying a thresholding parameter to eliminate outliers and imposing a sum-to-one constraint on the abundances.

关键词： Object detection Hyperspectral imaging Minerals Wavelet analysis Data analysis Hyperspectral sensors Feature extraction Human computer interaction Wavelet domain Africa

来源：评论

学校读者我要写书评

暂无评论

Quadratic fermionic interactions yield Hamiltonians with large ground-state energy gaps

引用

Physical Review A 2009年第3期79卷 032331-032331页

作者： Michael J. O’Hara Dianne P. O’Leary Applied Mathematics Program University of Maryland College Park MD 20742 United States Department of Computer Science Institute for Advanced Computer Studies University of Maryland College Park MD 20742 United States Mathematical and Computational Sciences Division National Institute of Standards and Technology Gaithersburg MD 20899 United States

Polynomially large ground-state energy gaps are rare in many-body quantum systems, but useful in quantum information and an interesting feature of the one-dimensional quantum Ising model. We show analytically that the gap is generically polynomially large not just for the quantum Ising model, but for one-, two-, and three-dimensional interaction lattices and Hamiltonians with certain random interactions. We extend the analysis to Hamiltonian evolutions and we use the Jordan-Wigner transformation and a related transformation for spin-3/2 particles to show that our results can be restated using spin operators in a surprisingly simple manner. These results also yield a new perspective on the one-dimensional cluster state.

关键词： Ising model

来源：评论

学校读者我要写书评

暂无评论

Reducing the dimensionality of hyperspectral data using diffusion maps

Reducing the dimensionality of hyperspectral data using diff...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Louis du Plessis Steven Damelin Michael Sears School of Computational and Applied Mathematics University of the Witwatersrand South Africa Department of Mathematical Sciences Georgia Southern University Statesboro GA USA School of Computer Science University of the Witwatersrand Johannesburg South Africa

We examine the analysis of hyperspectral data produced by the Hy-perspectral Core Imager of AngloGold Ashanti. The dimension of the data is reduced using diffusion maps and the data is then clustered using three divisive clustering strategies. Divisive k-means, PDDP and the NCut algorithm are used. It is shown that the clusterings produced are reasonably accurate compared to a reference clustering, but superior with respect to an internal quality evaluation. Moreover, using a divisive algorithm makes it possible to keep track of inter-cluster similarities. It is also shown that by embedding sample spectra in a dataset it is possible to identify particular minerals within the cluster.

关键词： Hyperspectral imaging Hyperspectral sensors Human computer interaction Minerals Clustering algorithms mathematics computer science Spatial resolution Subspace constraints Africa

来源：评论

学校读者我要写书评

暂无评论

Default network and intelligence difference

Default network and intelligence difference

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Ming Song Yong Liu Yuan Zhou Kun Wang Chunshui Yu Tianzi Jiang Research Center of Computational Medicine Sino-French Laboratory in Computer Science Automation and Applied Mathematics Institution of Automation Chinese Academy and Sciences Beijing China Department of Radiology Xuanwu Hospital of Capital Medical University Beijing China

In the last few years, many studies in the cognitive and system neuroscience found that a consistent network of brain regions, referred to as the default network, showed high levels of activity when no explicit task was performed. Some scientists believed that the resting state activity might reflect some neural functions that consolidate the past, stabilize brain ensembles and prepare us for the future. Here, we modeled default network as undirected weighted graph and then used graph theory to investigate the topological properties of the default network of the two groups of people with different intelligence levels. We found that, in both groups, the posterior cingulate cortex showed the greatest degree in comparison to the other brain regions in the default network, and that the medial temporal lobes and cerebellar tonsils were topologically separations from the other brain regions in the default network. More importantly, we found that the strength of some functional connectivities and the global efficiency of default network were significantly different between the superior intelligence group and the average intelligence group, which indicates that the functional integration of the default network might be related to the individual intelligent performance.

关键词： Intelligent networks Humans Artificial intelligence Neuroscience Graph theory Temporal lobe Intelligent sensors Automation Hospitals Alzheimer's disease

来源：评论

学校读者我要写书评

暂无评论

Block Ignition Inertial Confinement Fusion (ICF) with Condensed Matter Cluster Type Targets for p‐B11 Powered Space Propulsion

引用

AIP Conference Proceedings 2009年第1期1103卷 656-672页

作者： George H. Miley H. Hora J. Badziak J. Wolowski Zheng‐Ming Sheng Jie Zhang F. Osman Weiyan Zhang Xia tu He aUniversity of Illinois Urbana‐Champaign NPL Associates 216 Talbot Laboratory 104 S. Wright St. Urbana IL 61801 217‐333‐3772 bDepartment of Theoretical Physics University of New South Wales Sydney Australia cInstitute of Plasma Physics and Laser Microfusion Warsaw Poland dBeijing National Laboratory for CondensedMatter Physics Institute of Physics Chinese Academy of ScienceBeijing 100080 China eSchool of Computer Sciences University of Western Sydney Penrith Australia fChina Academy of Engineering Physics Mianyang China gInstitute of Applied Physics and Computational Mathematics Beijing China hInstitute of Physics Academy of Science Prague Czech Republic

The use of laser‐driven Inertial Confinement Fusion (ICF) for space propulsion has been the subject of several earlier conceptual design studies, (see: Orth, 1998; and other references therein). However, these studies were based on older ICF technology using either “direct “or “in‐direct x‐ray driven” type target irradiation. Important new directions have opened for laser ICF in recent years following the development of “chirped” lasers capable of ultra short pulses with powers of TW up to few PW which leads to the concept of “fast ignition (FI)” to achieve higher energy gains from target implosions. In a recent publication the authors showed that use of a modified type of FI, termed “block ignition” (Miley et al., 2008), could meet many of the requirements anticipated (but not then available) by the designs of the Vehicle for Interplanetary Space Transport Applications (VISTA) ICF fusion propulsion ship (Orth, 2008) for deep space missions. Subsequently the first author devised and presented concepts for imbedding high density condensed matter “clusters” of deuterium into the target to obtain ultra high local fusion reaction rates (Miley, 2008). Such rates are possible due to the high density of the clusters (over an order of magnitude above cryogenic deuterium). Once compressed by the implosion, the yet higher density gives an ultra high reaction rate over the cluster volume since the fusion rate is proportional to the square of the fuel density. Most recently, a new discovery discussed here indicates that the target matrix could be composed of B11 with proton clusters imbedded. This then makes p‐B11 fusion practical, assuming all of the physics issues such as stability of the clusters during compression are resolved. Indeed, p‐B11 power is ideal for fusion propulsion since it has a minimum of unwanted side products while giving most of the reaction energy to energetic alpha particles which can be directed into an exhaust (propulsion) nozzle. Power plants using p‐

关键词：

来源：评论

学校读者我要写书评

暂无评论

A multi-level genetic algorithm for a multi-stage space allocation problem 7

A multi-level genetic algorithm for a multi-stage space allo...

引用

7th International Conference on the Practice and Theory of Automated Timetabling, PATAT 2008

作者： Adewumi, Aderemi O. Montaz Ali, M. Ayeni, Joshua O. School of Computational and Applied Mathematics University of Witwatersrand Johannesburg South Africa Department of Computer Sciences Faculty of Science University of Lagos Lagos Nigeria

We considered the case of a multi-stage hostel space allocation problem based on data set obtained from a tertiary institution. Genetic Algorithm was applied at different levels of the allocation. We studied the effects of parameter change on solutions obtained. The rate of feasibility of the solutions was also determined. © Practice and Theory of Automated Timetabling, PATAT *** right reserved.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Diffusion maps - A probabilistic interpretation for spectral embedding and clustering algorithms

Diffusion maps - A probabilistic interpretation for spectral...

引用

作者： Nadler, Boaz Lafon, Stephane Coifman, Ronald Kevrekidis, Ioannis G. Department of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot 76100 Israel Google Inc. United States Department of Mathematics Yale University New Haven CT 06520-8283 United States Department of Chemical Engineering Program in Applied and Computational Mathematics Princeton University Princeton NJ 08544 United States

ISBN: (纸本)9783540737490

Spectral embedding and spectral clustering are common methods for non-linear dimensionality reduction and clustering of complex high dimensional datasets. In this paper we provide a diffusion based probabilistic analysis of algorithms that use the normalized graph Laplacian. Given the pairwise adjacency matrix of all points in a dataset, we define a random walk on the graph of points and a diffusion distance between any two points. We show that the diffusion distance is equal to the Euclidean distance in the embedded space with all eigenvectors of the normalized graph Laplacian. This identity shows that characteristic relaxation times and processes of the random walk on the graph are the key concept that governs the properties of these spectral clustering and spectral embedding algorithms. Specifically, for spectral clustering to succeed, a necessary condition is that the mean exit times from each cluster need to be significantly larger than the largest (slowest) of all relaxation times inside all of the individual clusters. For complex, multiscale data, this condition may not hold and multiscale methods need to be developed to handle such situations.

关键词： Relaxation time

来源：评论

学校读者我要写书评

暂无评论

The SAT-tableau calculus

The SAT-tableau calculus

引用

21st International Workshop on Description Logics, DL 2008

作者： Keller, Uwe Heymans, Stijn University of Innsbruck Innsbruck Austria Knowledge-Based Systems Group Institute of Information Systems Technical University of Vienna Austria Department of Applied Mathematics and Computer Science Computational Web Intelligence Ghent University Belgium

来源：评论

学校读者我要写书评

暂无评论

The attractor of the stochastic generalized Ginzburg-Landau equation

引用

science China mathematics 2008年第5期51卷 955-964页

作者： GUO BoLing~1 WANG GuoLian~(2+) Li DongLong~3 1 Institute of applied Physics and computational mathematics,P.O.Box 8009,Beijing 100088,China 2 The Graduate School of China Academy of Engineering Physics,P.O.Box 2101,Beijing 100088,China 3 Department of Information and computer science,Guangxi University of Technology,Liuzhou 545006,China Institute of Applied Physics Computational Mathematics P. O. Box 8009 Beijing 100088 China The Graduate School of China Academy of Engineering Physics P. O. Box 2101 Beijing 100088 China Department of Information Computer Science Guangxi University of Technology Liuzhou 545006 China

The stochastic generalized Ginzburg-Landau equation with additive noise can be solved pathwise and the unique solution generates a random system. Then we prove the random system possesses a global random attractor in ... 详细信息

关键词： generalized Ginzburg-Landau equation random dynamical systems random attractor 35K05

来源：评论

学校读者我要写书评

暂无评论

Hardware-accelerated components for hybrid computing systems

Hardware-accelerated components for hybrid computing systems

引用

2008 Component Based High Performance Workshop - CompFrame/HPC-GECO Workshop Series, CBHPC'08

作者： Chavarría-Miranda, Daniel Nieplocha, Jarek Gorton, Ian High Performance Computing Pacific Northwest National Laboratory United States Computational Sciences and Mathematics Division Pacific Northwest National Laboratory United States Applied Computer Science Pacific Northwest National Laboratory United States

ISBN: (纸本)9781605583112

We present a study on the use of component technology for encapsulating platform-specific hardware-accelerated algorithms on hybrid HPC systems. Our research shows that component technology can have significant benefits from a software engineering point-of-view to increase encapsulation, portability and reduce or eliminate platform dependence for hardware-accelerated algorithms. As a demonstration of this concept, we discuss our experience in designing, implementing and integrating an FPGA-accelerated kernel for Polygraph, an application in computational proteomics. Copyright 2008 ACM.

关键词： computer software portability

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：