检索结果-内蒙古大学图书馆

SVD-based model for mine quasi-geoid establishment

Procedia Earth and Planetary Science 2009年第1期1卷 1212-1219页

作者： Xu, Chang-hui Qin, Zhen School of Environment Science and Spatial Informatics China University of Mining and Technology Xuzhou 221116 China Jiangsu Key Laboratory of Resources and Environmental Information Engineering Xuzhou 221116 China

Existing rank-defect free network adjustment is to some extent adaptable for singular problems with additional conditions but not responsible for abnormal adjustment including singular and ill-conditioned situations in the establishment of mine quasi-geoid. To avoid additional conditions, a new singular value decomposition (SVD)-based pseudoinverse solution is introduced, which needs only two steps for calculation. The coefficient matrix was transformed into bidiagonal matrix with full orthogonal decomposition, and the accomplishment was carried out by iterative algorithm of implicit symmetric QR decomposition. To evaluate the effects and stability, we compared the result using least squares for full rank including ill-conditioned and singular with that using SVD. Meanwhile, both inside precision and outside precision were used to assess the efficiency of these methods. Based on analyzing two situations with or without coordinates constants, the three methods have the same effect if there is no any constant; however, if there are some constants, only the SVD method can have a right result. © 2009.

关键词： Singular value decomposition Mining Bidiagonal Coefficient matrix Defect free networks Height anomaly If there are Ill conditioned problems Ill conditioned iterative algorithm Least Square matrix Orthogonal decomposition Pseudo inverse solution Q R decomposition singular and ill conditioned problems Singular problem SVD method

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Blind Super-resolution Image Reconstruction Based on POCS Model

Blind Super-resolution Image Reconstruction Based on POCS Mo...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Xie Wei Zhang Feiyan Chen Hao Qin Qianqing Wuhan Univ Natl Engn Res Ctr Multimedia Software Wuhan 430072 Peoples R China Wuhan Univ Sch Elect Informat Wuhan 430072 Peoples R China

ISBN: (纸本)9780769535838

Due to the high cost and physical limitations of the high precision image sensors, it is not easy to directly obtain the desired high resolution (HR) images from sensors in many cases. A new iterative super-resolution (SR) algorithm based on projection onto convex sets (POCS) model is proposed. In this method, a new algorithm is adopted to estimate subpixel shift of the low-resolution (LR) images and do motion compensation. The main stage of the algorithm employs the iterative method of POCS model, utilizing some new constraint operators. The experiment shows the method is robust and e ective. The disadvantage is that the convergence of the algorithm is not very fast.

关键词： Blind super-resolution POCS model subpixel estimate iterative algorithm blurred image

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Rate Control for Scalable Multimedia Applications in Network-on-Chips

Rate Control for Scalable Multimedia Applications in Network...

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International Conference on Scalable Computing and Communications/8th International Conference on Embedded Computing

作者： Mostafavi, Salman Khonsari, Ahmad Talebi, Mohammad S. Ould-Khaoua, Mohamed Univ Tehran ECE Dept Tehran Iran IPM Sch Comp Sci Tehran Iran Univ Soltan Qaboos Dept ECE Muscat Oman

ISBN: (纸本)9781424453320

Network-on-Chip (NoC) architectures are emerged as a promising solution to the lack of scalability in Multi-Processor Systems-on-Chips (MPSoCs). With the explosive growth in the usage of multimedia applications, it is expected that NoC serves as a multimedia server supporting multi-class services. This paper addresses rate control problem for applications with scalable multimedia services in Network-on-Chip architectures. Scalable multimedia applications are relying on multi-class services which use layered encoding schemes. We formulate the rate control for multimedia with multi-class services using the optimization approach. This allows us to devise an iterative rate control algorithm as the solution to the optimization problem. The rate control algorithm can be implemented using a controller with low computational overhead. The validity of the obtained expressions is demonstrated by comparing results predicted by the analytical model against those attained through extensive simulation experiments.

关键词： Network-on-Chip (NoC) Rate Control Multimedia Optimization iterative algorithm

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GEOMETRICAL INTERPRETATION AND IMPROVEMENTS OF THE BLAHUT-ARIMOTO'S algorithm

GEOMETRICAL INTERPRETATION AND IMPROVEMENTS OF THE BLAHUT-AR...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Naja, Ziad Alberge, Florence Duhamel, Pierre Univ Paris Sud L2S 3 Rue Johot Curie F-91192 Gif Sur Yvette France Univ Paris Sud CNRS F-91192 Gif Sur Yvette France

ISBN: (纸本)9781424423538

The paper first recalls the Blahut Arimoto algorithm for computing the capacity of arbitrary discrete memoryless channels, as an example of an iterative algorithm working with probability density estimates. Then, a geometrical interpretation of this algorithm based on projections onto linear and exponential families of probabilities is provided. Finally, this understanding allows also to propose to write the Blahut-Arimoto algorithm, as a true proximal point algorithm. it is shown that the corresponding version has an improved convergence rate, compared to the initial algorithm, as well as in comparison with other improved versions.

关键词： iterative algorithm Blahut-Arimoto algorithm Geometrical interpretation Convergence speed Proximal point method

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Two-phase Flow Parameters Measurement and Gauss-Newton Image Reconstruction algorithm for Electrical Capacitance Tomography

Two-phase Flow Parameters Measurement and Gauss-Newton Image...

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International Conference on Industrial Mechatronics and Automation

作者： Chen Yu Zhang Jian Chen Deyun Northeastern Forestry Univ Informat & Comp Engn Inst Harbin Peoples R China Harbin Univ Sci & Technol Comp Inst Harbin Peoples R China

ISBN: (纸本)9781424438181

To solve the problem of two-phase flow measurement for electrode electrical capacitance tomography (ECT), on the basis of analyzing ECT system measurement principle, we constructed the mathematical model of two-phase flow distribution information according to double integral infinitesimal principle, and formed a set of 12-Electrode two-phase ECT system. And to speed up the slow convergence rate of ordinary iteration method, a Gauss-Newton algorithm is improved on the basis of analyzing mechanism of the algorithm, and the feasibility of using this algorithm for ECT problems is discussed. It shows that it is easy to meet the convergence condition and error of image reconstruction is small. Experimental results and simulation data indicate that the algorithm can provide high quality images and favorable stabilization compared with LBP, Landweber and conjugate gradient algorithms and this new algorithm presents a feasible and effective way to research on image reconstruction algorithm for Electrical Capacitance Tomography System.

关键词： electrical capacitance tomography image reconstruction iterative algorithm Gauss-Newton

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New System of Quasi-variational-like Inclusions Involving monotone Operators in General Banach Spaces

New System of Quasi-variational-like Inclusions Involving mo...

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International Forum on Information Technology and Applications (IFITA 2009)

作者： Ni Renxing Shaoxing Univ Dept Math Shaoxing 313000 Zhejiang Peoples R China

ISBN: (纸本)9780769536002

A new system of set-valued quasi-variational-like inclusions (in short,QVLI) involving H-n-monotone operators is introduced and studied in general Banach spaces without uniform smoothness. Moreover, A new iterative algorithm to find the approximation solutions of the QVLI is suggested and analyzed. It is proved that the iterative sequences generated by the algorithm converge strongly to the exact solution of the QVLI under suitable assumptions. These new results extend and improve the corresponding ones in this field.

关键词： iterative algorithm new system of set-valued quasi-variational-like inclusions H-n-monotone operator resolvent operator technique

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A novel Quasi-Newton Image Reconstruction algorithm For Electrical Capacitance Tomography System

A novel Quasi-Newton Image Reconstruction Algorithm For Elec...

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2nd ISECS International Colloquium on Computing, Communication, Control and Management (CCCM 2009)

作者： Yu, Chen Fan, Sun Bo, Yi Chen Deyun Northeast Forestry Univ Informat & Comp Engn Inst Harbin Peoples R China Harbin Univ Sci & Technol Comp Inst Harbin Peoples R China

ISBN: (纸本)9781424442461

To solve the electrical capacitance tomography(ECT) technology "soft field" effect and pathological problem, a Quasi-Newton new algorithm for electrical capacitance tomography is presented. On the basis of analyzing ECT system measurement principle, constructing corrector formula of secant approximation algorithm in second-order information items of objective functions. The feasibility of using this algorithm for ECT problems is also discussed. It shows that it is easy to meet the convergence condition and error of image reconstruction is small. Experimental results and simulation data indicate that the algorithm can provide high quality images and favorable stabilization compared with LBP and conjugate gradient algorithms and this new algorithm presents a feasible and effective way to research on image reconstruction algorithm for Electrical Capacitance Tomography System.

关键词： electrical capacitance tomography image reconstruction iterative algorithm Quasi-Newton

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A Novel DOA algorithm for CDMA System

A Novel DOA Algorithm for CDMA System

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International Conference on Networks Security, Wireless Communications and Trusted Computing

作者： Peng, Zhenzhe Wan, Fangjie Natl Digital Switching Ctr Zhengzhou Peoples R China

ISBN: (纸本)9780769536101

In this paper, an iterative high-resolution DOA algorithm is proposed for DOA estimation for CDMA systems. The algorithm iteratively removes detected signals from the received data and searches the residue spatial spectrum for further signals. It does not require any computationally expensive eigen decomposition or spatial smoothing in coherent multipath scenarios. Results are presented illustrating high-resolution at significantly lower SNR levels than those obtained by classical DOA algorithms such as MUSIC and MVM.

关键词： DOA CDMA iterative algorithm MUSIC MVM

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An Improved Ordered-subset Simultaneous Algebraic Reconstruction Technique

An Improved Ordered-subset Simultaneous Algebraic Reconstruc...

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2nd International Congress on Image and Signal Processing

作者： Kong, Huihua Pan, Jinxiao N Univ China Dept Math Taiyuan 030051 Shanxi Peoples R China

ISBN: (纸本)9781424441303

Ordered-subset simultaneous algebraic reconstruction technique (OS-SART) was studied by Ge Wang and Ming Jiang in 2004. It accelerate the convergence of SART, but it has some disadvantages, such as increasing the number of subsets accelerates iterative convergence, but there is a point beyond which image quality degrades due to a lack of statistical information within subset. In this paper, a new method of subset partition based on statistical test is proposed as an improved OS-SART (IOS-SART). IOS-SART can automatically adjust the number of the subsets for each iteration according to the statistical information content within subset demanded by user. Numerical simulation and application to practical data demonstrate that this algorithm converge faster and can provide high quality reconstructed images after a small number of iterations.

关键词： image reconstruction iterative algorithm simultaneous algebraic reconstruction technique ordered subsets hypotheis testing

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iterative algorithms with variable anchors for non-expansive mappings

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JOURNAL OF APPLIED MATHEMATICS AND COMPUTING 2008年第1-2期28卷 39-49页

作者： Yao, Yonghong Zhou, Haiyun Liou, Yeong-Cheng Tianjin Polytech Univ Dept Math Tianjin 300160 Peoples R China Shijiazhuang Mech Engn Coll Dept Math Shijiazhuang 050003 Peoples R China Cheng Shiu Univ Dept Informat Management Kaohsiung 833 Taiwan

In this paper, we suggest and analyze some new iterative algorithms with variable anchors for non-expansive mapping in Banach spaces. We prove that the proposed iterative algorithms converge strongly to a fixed point of some non-expansive mapping. We also obtain some corollaries which include some results as special cases. Furthermore, we conclude the strong convergence of the so-called viscosity iterative algorithms.

关键词： Non-expansive mapping iterative algorithm Fixed point Strong convergence

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