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IEEE International Conference on Communications Workshops

作者： Ya-Feng Liu Yu-Hong Dai Zhi-Quan Luo State Key Lab. of Scientific and Engineering Computing Chinese Academy of Sciences Dept. of Electronic and Computer Engineering University of Minnesota

ISBN: (纸本)9781612842325

Consider the max-min fairness linear transceiver design for a multi-user MIMO interference channel. Assuming perfect channel knowledge, this problem can be formulated as the maximization of minimum SINR utility, subject to individual power constraints at each transmitter. In this paper, it is shown that when the number of antennas at each transmitter (receiver) is at least two and at each receiver (transmitter) is at least three, the problem of checking whether the given target SINR is feasible is strongly NP-hard. A cyclic coordinate ascent algorithm is also proposed for this design problem. Monotonicity and global convergence to KKT solution of the proposed algorithm are proved.

关键词： Interference channels transmitter receivers Transceivers multiple input multiple output systems Individual Power SINR global convergence Transmitters ANTENNA

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Research on automatic construction of the dynamic Chinese porn feature knowledge system

Research on automatic construction of the dynamic Chinese po...

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2010 International Conference on Computer Design and Applications, ICCDA 2010

作者： Peno, Yu-Zhong Yuan, Chang-An Qin, Xiao Key Lab. of Scientific Computing and Intelligent Information Processing in Universities of Guangxi School of Computer and Information Engineering Guangxi Teacher Education University Nanning 530001 China

ISBN: (纸本)9781424471638

As the Web continues to grow, the pornographic texts in varied forms run rampant on Internet, despite repeated prohibitionsm. It severely does harms to the development of people's mental health and the stability of sociality. In this paper, We propose a novel and effective feature weight-value calculating method named FEFP for such objectionable information, and design a scheme to auto-build system of porn feature knowledge which can be dynamically updated. The experiments are designed and conducted to compare the FEFP with four famous existing methods of Web page feature extraction. Experimental results show that the proposed approach has both higher feature coverage and lower redundancy rates for either porn on conventional forms or porn whose form has been changed. It is very good and very suitable for processing the harmful information in current form which is volatile and increasingly hidden. © 2010 IEEE.

关键词： Feature extraction

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Research on network Chinese pornography characteristic and corresponding filtering system's model

Research on network Chinese pornography characteristic and c...

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International Conference on Internet Technology and Applications, ITAP 2010

作者： Peng, Yu-Zhong School of Computer and Information Engineering Key Lab. of Scientific Computing and Intelligent Information Processing in Universities of Guangxi Guangxi Teacher Education University Nanning 53001 China

ISBN: (纸本)9781424451432

At present,the internet pornographic text is in varied forms and changeful, although it is prohibited ever. It severely harms people's mental and physical health development and social stability. There are IP-based,keyword-based and intelligent content analysis filtering systems against it today. But they are difficult to deal with manifestations of diversity, changeful, and increasingly concealed porn. In this paper, a in-depth research has done for the appeared characteristics of such undesirable information on our statistical analysis. And based on this characteristics, a new text pre-processing algorithm PA-PTCI is proposed, and a effective model combined with content filtering technology to the current text information filtering pornography problem is designed. The experimental result shows the PA-PTCI algorithm and the proposed model are quite effective. ©2010 IEEE.

关键词： Information filtering

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ON THE COMPLEXITY OF OPTIMAL COORDINATED DOWNLINK BEAMFORMING

ON THE COMPLEXITY OF OPTIMAL COORDINATED DOWNLINK BEAMFORMIN...

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IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Ya-Feng Liu Yu-Hong Dai Zhi-Quan Luo State Key Lab. of Scientific and Engineering Computing Chinese Academy of Sciences Beijing 100190 China Dept. of ECE University of Minnesota Minneapolis MN 55455 USA

ISBN: (纸本)9781424442959

In a cellular wireless system, users located at cell edges often suffer significant out-of-cell interference. In this paper we consider a coordinated beamforming approach whereby multiple base stations jointly optimize their downlink beamforming vectors in order to simultaneously improve the data rates of a given group of cell edge users. Assuming perfect channel knowledge, we formulate this problem as the maximization of a system utility function (which balances user fairness and average user rates), subject to individual power constraints at each base station. We show that, for the single carrier case and when the number of antennas at each base station is at least two, the optimal coordinated beam-forming problem is strongly NP-hard for both the harmonic mean utility function and the proportional fairness utility function. For the min-rate utility function, we show that the problem is solvable in polynomial time.

关键词： Utility functions BASE STATION Beamforming Data transfer rates Complexity Individual Power Nondeterministic polynomial-time hard Polynomial time Wireless cellular systems ANTENNA Soluble

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A compression algorithm for multi-streams based on GEP

A compression algorithm for multi-streams based on GEP

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3rd International Conference on Genetic and Evolutionary computing, WGEC 2009

作者： Ding, Chao Yuan, Chang-An Qin, Xiao Peng, Yu-Zhong Computer and Information Engineering College Guangxi Teachers Education University Nanning 530001 China First Middle School of Mengcheng Anhui Mengcheng233500 China Key Lab. of Scientific Computing and Intelligent Information Processing in Universities of Guangxi Guangxi Teachers Education University Nanning China

ISBN: (纸本)9780769538990

This paper applied the Methods which based on GEP in compress multi-streams. The contributions of this paper include: 1) giving an introduction to data function finding based on GEP(DFF-GEP), defining the main conception of Multi-Streams, and revealing the map relation in it;2) putting forward the Compression Algorithm for Multi-Streams according to map relation lied in data between data streams;and 3)providing an experience with the real data and find that (3.1) the compression ratio of the new methods is 120-150 times as the traditional wavelets method, and 35-70 times as the wavelets and coincidence method;(3.2) the relative error of the new method is about 3??,yet maximum relative error is 0.01 by using the traditional relative error standard, the precision is improved from 7% to 15% as compared with the traditional method. © 2009 IEEE.

关键词： Errors

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Surface modelling using fourth order geometric flows

Surface modelling using fourth order geometric flows

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International Conference on Computer Graphics, Imaging and Visualization, CGIV

作者： Guoliang Xu Qing Pan State Key Lab of Scientific and Engineering Computing Institute of Computational Mathematics Academy of Mathematics and System Science Chinese Academy and Sciences China

We use two fourth order geometric partial differential equations to efficiently solve several surface modelling problems, including the surface blending, the N-sided hole filling and the free-form surface fitting with the G/sup 1/ boundary continuity. The nonlinear equations used include the surface diffusion flow and the Willmore flow. These nonlinear equations are discretized using the mixed finite element method based on the combination of the loop's basis and the linear basis. The proposed approach is simple, efficient and gives very desirable results.

关键词： Computational geometry Finite element methods Nonlinear equations Partial differential equations Surface fitting

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C¹ modeling with hybrid multiple-sided a-patches

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International Journal of Foundations of Computer Science 2002年第2期13卷 261-284页

作者： Xu, Guoliang Bajaj, Chandrajit L. Evans, Susan State Key Lab. of Scientific and Engineering Computing ICMSEC Chinese Academy of Sciences Beijing China Department of Computer Science University of Texas Austin TX 78712 United States Department of Computer Science University of Purdue West Lafayette IN United States

We propose a new scheme for modeling a smooth interpolatory surface, from a surface discretization consisting of triangles, quadrilaterals and pentagons, by algebraic surface patches which are subsets of real zero contours of trivariate rational functions defined on a collection of tetrahedra and pyramids. The rational form of the modeling function provides enough degrees of freedom so that the number of the surface patches is significantly reduced, and the surface has quadratic recover property. © 2002 World scientific Publishing Company.

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用于3D深度偏移的螺旋式有限差分法

用于3D深度偏移的螺旋式有限差分法

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SEG第70届年会

作者： Guanquan Zhang Yu Zhang Hongbo Zhou 杨京涛 State Key Lab of Scientific and Engineering Computing Chinese Academy of Sciences Veritas DGC Inc. Veritas DGC Inc.

基于Collino和Joly(1995)及Ristow和Ruhl(1997)的工作,本文提出了在(ω-x-y) 域进行单向向下外推的隐式有限差分偏移新方法。这种方法进一步把2D算子分裂为1D算子, 这样就可应用螺旋式方法来降低数值各向异性,同时又能保持计算的效率。... 详细信息

基于Collino和Joly(1995)及Ristow和Ruhl(1997)的工作,本文提出了在(ω-x-y) 域进行单向向下外推的隐式有限差分偏移新方法。这种方法进一步把2D算子分裂为1D算子, 这样就可应用螺旋式方法来降低数值各向异性,同时又能保持计算的效率。因为有限差分算子的局部性,所以本方法能够处理大的横向速度变化。数值实例表明该算法是准确和有效的。

关键词：深度偏移数值各向异性陡倾角波动方程水平切片算子分裂有限差分法

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Parallel implementation of 2-D prestack depth migration 4

Parallel implementation of 2-D prestack depth migration

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4th International Conference/Exhibition on High Performance computing in the Asia-Pacific Region, HPC-Asia 2000

作者： Zhang, Guanquan Zhang, Wensheng State Key Lab. of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Chinese Academy of Sciences P.O. Box 2719 Beijing China

ISBN: (纸本)0769505902

We present an implementation of parallel prestack depth migration for 2-D Marmousi data. Our implementation is based on the three prestack depth migration methods: finite-difference method, split-step Fourier method and Fourier finite-difference method. In this article, a brief description of the three methods is given, and the performance of parallel implementation with Message Passing Interface (MPI) and the migration profiles of Marmousi data are presented. It is shown that the Fourier finite-difference migration produced more accurate images in the areas of large lateral velocity variations. © 2000 IEEE.

关键词： Finite difference method

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Helical finite-difference schemes for 3-D depth migration

Helical finite-difference schemes for 3-D depth migration

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2000 Society of Exploration Geophysicists Annual Meeting, SEG 2000

作者： Zhang, Guanquan Zhang, Yu Zhou, Hongb State Key Lab of Scientific and Engineering Computing Chinese Academy of Sciences China Veritas DGC Inc. United States

Based on Collino and Joly (1995) and Ristow and Ruhl (1997), we present a new implicit finite-difference implementation of migration with one-way downward extrapolation in (w - x - y) domain. Our method further splits 2-D operators to 1-D operators so that helical schemes can be used to reduce numerical anisotropy and retain computational efficiency. Because of the locality of finite-difference operators, our algorithm can handle large lateral velociy. variation. Numerical examples show that our algorithm is accurate and efficient. © SEG 2000. All rights reserved.

关键词： Computational efficiency

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