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2nd International Conference on Civil Engineering, Architecture and Building Materials (CEABM 2012)

作者： Li, Yuhua Huang, Kai Gao, Yingzhen Dalian Univ Technol Fac Infrastruct Engn Dalian 116024 Liaoning Peoples R China

ISBN: (纸本)9783037854242

When we make design of mixture ratio, we always use normal equation method (NEM), but the solution value of that method may doesn't meet our demand. When we use the new method that proposed in this paper, we can solve the problem. The new method makes an improvement for NEM. By iterative algorithm, the new method uses the gradation data calculated by NEM as initial target value, canceling the relevant aggregate if the result of proportion is negative, and setting the gradation to the boundary value if the target value goes beyond limits. According to the adjusted object value, using NEM again, the new aggregate proportion can be solved. Then the new gradation of mixture will come into being the next target value. Finally, the accurate result will meet our need. The new improved method has good engineering applicability and high accuracy.

关键词： Mixture Ratio Normal Equation Method iterative algorithm Proportion Design

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Regularized Reconstruction of Irregularly Sampled Scalar Light Fields

Regularized Reconstruction of Irregularly Sampled Scalar Lig...

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9th Euro-American Workshop on Information Optics

作者： Uzunov, Vladislav Gotchev, Atanas Egiazarian, Karen Tampere Univ Technol Dept Signal Proc POB 553 FIN-33101 Tampere Finland

ISBN: (纸本)9781424482276

This paper addresses the problem of reconstruction of a monochromatic light field based on data points, irregularly distributed within a volume of interest. Such set up is considered to serve a wide area of applications related with three-dimensional display and beam shaping, where physically inconsistent input data is commonly available. Finite-dimensional models of scalar light fields are used to state the reconstruction problem as matrix inversion. Regularized inversion is done by the Tikhonov method, implemented by the iterative algorithm of conjugate gradients. The problem proves to be ill-posed, where the data points inconsistency is fully compensated by the regularized inversion, showing to be attractive for any application.

关键词： 3D display Tikhonov method beam shaping computer generated holography conjugate gradients finite-dimensional model holography image reconstruction irregularly sampled scalar light field iterative algorithm iterative methods matrix inversion optical pulse shaping regularized inversion regularized reconstruction

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A method for numerical quadrature over an infinite interval using systematically increasing mesh size

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Numerische Mathematik 1971年第5期16卷 397-407页

作者： Clendenin, W.W. Los Alamos Scientific Laboratory University of California Los Alamos New Mexico United States

A quadrature formula for an infinite interval in one dimension is developed for a mesh with a fixed ratio between the lengths of successive mesh intervals. Passage to a finer mesh of this type retains points of the coarser mesh. An iterative algorithm is based on the subdivision of gross intervals by this means. For a power function integrand, the relative error per mesh interval is constant, which is in marked contrast with the case of a uniform mesh. Numerical comparisons of results have been made with those from an iterative Gauss-Laguerre algorithm for integrals with widely differing convergence properties. In the cases examined, the expanding mesh algorithm achieves greater accuracy with fewer mesh points, with the difference especially marked in the case of slowly convergent integrals. © 1971 Springer-Verlag.

关键词： Mesh Size Power Function iterative algorithm Convergence Property Great Accuracy

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Design of iterative Hybrid Beamforming for Multi-User mmWave Massive MIMO Systems

Design of Iterative Hybrid Beamforming for Multi-User mmWave...

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IEEE International Workshop on Signal Processing Systems (IEEE SiPS)

作者： Tsai, Pei-Yun Huang, Xiao-Sheng Natl Cent Univ Dept Elect Engn Taoyuan Taiwan

ISBN: (纸本)9781538663189

Hybrid beamforming that combines analog phase shift and digital processing is a promising solution to alleviate the implementation cost and power consumption in millimeter wave (mmWave) massive MIMO systems. To achieve sum rate optimization, an iterative scheme that considers both the analog and digital precoders in the optimization metric is proposed. The digital precoder is mainly used to remove multiple access interference for enhancing the multiplexing gain. Then, the coordinated beamforming procedure between the base station and mobile stations is performed to exploit the array gain. Although the iterative scheme is used, only few iterations are required. This scheme can also be extended to the systems using precoding and combining vectors from quantized codebooks. Furthermore, with the channel reciprocity property or the two-phase training strategy, the iterative scheme can obtain the required channel information. From the simulation results, the sum rate is improved, especially when quantized codebooks are used.

关键词： Hybrid beamforming massive MIMO multi-user iterative algorithm codebook

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Real-Time Demand Response Multi-Energy Trading Strategy in Multiseller-Multibuyer Smart Distribution Grid 35

Real-Time Demand Response Multi-Energy Trading Strategy in M...

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35th Chinese Control and Decision Conference (CCDC)

作者： Hu, Yunlong Wu, Huaiyu Hu, Mian Chen, Yang Minist Educ Engn Res Ctr Met Automat & Measurement Technol Wuhan 430081 Peoples R China Wuhan Univ Sci & Technol Wuhan 430081 Peoples R China

ISBN: (纸本)9798350334722

The energy crisis caused by the shortage of traditional fossil fuels has greatly promoted the development of multi-energy resources and prompted the great changes in the energy load structure of users, so a new multibuyer-multiseller multi-energy trading framework based on real-time demand response in smart distribution grid is proposed in this paper. During the process of the multi-energy trading, the price competitions among the sellers are modeled as two non-cooperative games. The seller selection competition among the users is modeled as an evolutionary game. The interaction among the sellers and buyers is modeled as a Stackelberg game. Two iterative algorithms are proposed to obtain a Stackelberg equilibrium strategy, which maximizes the benefits of all electricity utility companies (EUCs), gas utility companies (GUCs) and users. Simulation results show that the real-time demand response strategy proposed in this paper can not only reduce the peak demand, reduce the electricity generation cost of EUCs and the gas production cost of GUCs, but also increase the benefits of users.

关键词： smart grid energy trading demand response game theory iterative algorithm

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Artemis I Optical Navigation System Performance

Artemis I Optical Navigation System Performance

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AIAA SciTech Forum

作者： Inman, Rebecca Holt, Greg Christian, John Smith, Kyle D'Souza, Christopher NASA Johnson Space Ctr Houston TX 77058 USA Georgia Inst Technol Guggenheim Sch Aerosp Engn Atlanta GA 30332 USA Charles Stark Draper Lab Houston TX 77058 USA NASA Langley Res Ctr Houston TX USA

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

This paper summarizes the assessment of the Optical Navigation Flight Test Objective (FTO) during the flight of Artemis I. The Optical Navigation (OpNav) System was tested under a variety of range, target, and lighting conditions to evaluate the performance compared to the pre-flight predicted error models. In general, OpNav performed very well-successfully processing over a thousand images of starfields, Earth, and Moon. The performance of the algorithm when processing Moon images matched the pre-flight expected error models. The errors when processing Earth images were notably higher than the preflight models predicted, however this was found to be due to an over-estimation of the atmosphere bias used in the tuning of the algorithm. After the bias was re-tuned and the images reprocessed, performance significantly improved.

关键词： Moon Planets Flight Testing iterative algorithm Earth Atmosphere Image Processing Thermal Effects Star Tracker Navigation algorithm System Architectures

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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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System of generalized nonlinear variational-like inclusions and fixed point problems: graph convergence with an application

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RENDICONTI DEL CIRCOLO MATEMATICO DI PALERMO 2024年第4期73卷 1343-1384页

作者： Balooee, Javad Postolache, Mihai Yao, Yonghong Univ Tehran Coll Sci Sch Math Stat & Comp Sci Tehran Iran North Minzu Univ Key Lab Intelligent Informat & Big Data Proc NingX Yinchuan 750021 Peoples R China North Minzu Univ Hlth Big Data Res Inst Yinchuan 750021 Peoples R China Romanian Acad Gheorghe Mihoc Caius Iacob Inst Math Stat & Appl M Bucharest 050711 Romania Natl Univ Sci & Technol POLITEHN Bucharest NUSTPB Dept Math & Informat Bucharest 060042 Romania Tiangong Univ Sch Math Sci Tianjin 300387 Peoples R China

In this paper, we are interested in the investigation of the problem of finding a commonelement of the set of fixed points of a total uniformly L-Lipschitzian mapping and the setof solutions of a system of generalized nonlinear variational-like inclusions. To approximatesuch a point lying in the above two sets, by employing some total uniformly L-Lipschitzianmappings and the notion ofP-eta-proximal-point mapping, a new iterative scheme is con-structed. We apply the notions of graph convergence andP-eta-proximal-point mapping andestablish a new equivalence relationship between graph convergence and proximal-pointmappings convergence of a sequence ofP-eta-accretive mappings. As an application of theobtained equivalence relationship, the strong convergence and stability of the sequence gen-erated by our proposed iterative algorithm to a common point of the above-mentioned twosets are proved. The final section is devoted to the investigation and analysis of the resultsgiven in [Nonlinear Anal. 67(2007), 917-929]. Some comments relating to them are pointedout. These results are new, and improve and generalize many known corresponding results.

关键词： System of generalized nonlinear variational-like inclusions Total uniformly L-Lipschitzian mapping Fixed point problem Graph convergence iterative algorithm P-eta-accretive mapping Proximal-point mapping Convergence analysis 47H05 47H09 47J20 47J22 47J25 49J40

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The Study of Feature Extraction Based on the Optimal Threshold Segmentation algorithm

The Study of Feature Extraction Based on the Optimal Thresho...

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Advanced Polymer Processing International Forum (APPF 2012)

作者： Ren, Xia Ma, Lianxiang Qingdao Univ Sci & Technol Coll Electromech Engn Qingdao Shandong Peoples R China

ISBN: (纸本)9783037857212

Image segmentation technology is crucial for feature extraction. In this paper, the traditional thresholding method has been improved, and the optimal threshold segmentation method is proposed by combining the iterative algorithm and mathematical morphology. Through analyzing the target area of image, the scope of the general gray-scale is determined. Based on the image edge and region, fast iterative algorithm is used to choose the optimum threshold as segmentation criteria. Moreover, morphology open computing is applied to the image threshold segmentation. Then the method is used in processing marine oil spill and solar flares. Different experiments of marine oil spill and solar flares based on the method show that this method can not only extract a clearer definition of interesting areas, but also can show a more clear-cut edge.

关键词： image segmentation optimal threshold iterative algorithm mathematical morphology

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Optical Correlation Recognition Based On LCOS

Optical Correlation Recognition Based On LCOS

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5th International Symposium on Photoelectronic Detection and Imaging (ISPDI) - Optical Storage and Display Technology

作者： Tang, Mingchuan Wu, Jianhong Soochow Univ Inst Informat Opt Engn Suzhou 215006 Peoples R China

ISBN: (纸本)9780819497826

Vander-Lugt correlator([1]) plays an important role in optical pattern recognition due to the characteristics of accurate positioning and high signal-to-noise ratio. The ideal Vander-Lugt correlator should have the ability of outputting strong and sharp correlation peak in allusion to the true target, in the existing Spatial Light Modulators([2]), Liquid Crystal On Silicon(LCOS) has been the most competitive candidate for the matched filter owing to the continuous phase modulation peculiarity. Allowing for the distortions of the target to be identified including rotations, scaling changes, perspective changes, which can severely impact the correlation recognition results, herein, we present a modified Vander-Lugt correlator based on the LCOS by means of applying an iterative algorithm to the design of the filter so that the correlator can invariant to the distortions while maintaining good performance. The results of numerical simulation demonstrate that the filter could get the similar recognition results for all the training images. And the experiment shows that the modified correlator achieves the 180 degrees rotating tolerance significantly improving the recognition efficiency of the correlator.

关键词： Vander Lugt correlator LCOS iterative algorithm

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