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telecommunications Market and Regulation in India and Ireland

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china Communications 2008年第2期5卷 83-87页

作者： Chen Xiuyu Beijing university of posts and telecommunications,{3. Beijing Univ posts & Telecommun Beijing Peoples R China

Information and communications technology is apillar industry in India and Ireland,playing an increasinglyimportant role in promoting the economicand social *** market competitionpromotes the rapid development of the *** market regulation andconstant legal system improvement can promote thesmooth development of the *** of new technology promotes a sustainabledevelopment of the *** is proposed that the pace of telecommunicationslegislation in china should be furtherquickened,telecommunications market structureoptimized,and telecommunications regulationstrengthened.

关键词： India Ireland telecommunications market regulation

Neighborhood-following algorithms for linear programming

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Science china Mathematics 2004年第6期47卷 812-820页

作者： Al WenbaoSchool of Science, Beijing university of posts and telecommunications, Beijing 100876, {3. 1. School of Science Beijing University of Posts and Telecommunications 100876 Beijing China

In this paper, we present neighborhood-following algorithms for linear programming. When the neighborhood is a wide neighborhood, our algorithms are wide neighborhood primal-dual interior point algorithms. If the neighborhood degenerates into the central path, our algorithms also degenerate into path-following algorithms. We prove that our algorithms maintain the O9√nL) -iteration complexity still, while the classical wide neighborhood primal-dual interior point algorithms have only the O(nL-iteration complexity. We also proved that the algorithms are quadratic convergence if the optimal vertex is nondegenerate. Finally, we show some computational results of our algorithms.

关键词： linear programming primal-dual interior point methods wide neighborhood methods quadratic convergence

CONDITIONS FOR UNIFORMLY NON-CONFOUNDING OF CAUSAL DISTRIBUTION EFFECTS OVER MULTIPLE COVARIATES

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Journal of Systems Science & Complexity 2010年第4期23卷 796-803页

作者： Xueli WANG School of Science,Beijing university of posts and telecommunications,Beijing 100876,{3.. School of Science Beijing University of Posts and Telecommunications

Causation is a distinct concept from association and more important than association inepidemiologic *** paper proposes the concept of uniform non-confounding for causal distributioneffects over multiple covariates,and gives the sufficient conditions for uniform non-confoundingover a covariate set C including confounders or non-confounders,and also shows the conditions forconditionally non-confounding in the *** these conditions can be tested by observeddata.

关键词： Causal distribution effect confounding covariates uniform non-confounding

Analyzing the Switching Characteristics of a NOLM Demultiplexer with on Analytic and Numrical Methods

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Chinese Journal of Lasers 1999年第5期8卷 419-424页

作者： LIU XianbinG YE Peida(telecommunications Engineering School, Beijing university of posts and telecommunications, Beijing 100876 china) 北京邮电大学电信工程学院北京

The switching characteristics of a NOLM demultiplexer are investigated by using an analytic and numerical method. The results reveal that the switching characteristics of a NOLM demultiplexer depend on parameters such as the power coupling ratio of the coupler,the peak power of control pulses, the walk-off and the initial time delay between signal pulses and control pulses, etc. The efficiency of NOLM is dependent on the peak power of controlpulses However, the switching window profile begins to oscillate as the power exceeds a critica value and this will be detrimental to the demultiplexed signals. The signal-control pulse walk-off can broaden the switching window of NOLM, make the window profile deviate fromits central position, and decrease its switching efficiency.

关键词： OTDM NOLM demultiplexer all-optical switch

Study on EDFA Gain Tilt and Nonlinear Distortion in an AM-VSB CATV Optical Fiber Transmission System

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Chinese Journal of Lasers 1999年第5期8卷 436-443页

作者： MAO Youju WANG Xueqiang(Chongqing university of posts and telecommunications, Chongqing 400065, {3.) 重庆邮电学院重庆 400065 重庆邮电学院重庆

The gain tilt of the erbium-doped fiber amplifier (EDFA) and the nonlinear distortion in an AM-VSB CATV optical fiber transmission system with a cascade of EDFAs are analyzed. It demonstrates that the nonlinear distortion induced by the light source and the EDFA would be counteracted each other to a certain degree as long as the EDFA has a negative gain tilt. As a result, an optimal EDFA negative gain tilt is suggested as a solution to selfcomensation of the nonlinear distortion.

关键词： gain tilt nonlinear distortion EDFA self-compensation

Robust multiuser MIMO scheduling algorithms with imperfect CSI

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Science china(Information Sciences) 2012年第4期55卷 815-826页

作者： MAO JunLing 1,3.GAO JinChun 1,3.LIU YuanAn 1,3.XIE Gang 2,3.& ZHANG Jian 1,3.1 School of Electronic Engineering,Beijing university of posts and telecommunications,Beijing 100876,{3. 2 School of Information and Communication Engineering,Beijing university of posts and telecommunications,Beijing 100876,{3. 3.Key Lab of Universal Wireless Communications,Ministry of Education,Beijing university of posts and telecommunications,Beijing 100876,{3. 1. School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China3. Key Lab of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China2. School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Robust multiuser multiple-input-multiple-output (MIMO) scheduling algorithms are proposed in this *** imperfect channel state information (CSI),traditional scheduling algorithms for the multiuser MIMO system based on the zero forcing precoding scheme will lose some performance due to the multi-user interference (MUI).In order to improve the system average throughput,we study the robust multiuser MIMO scheduling problem with imperfect *** the average capacity formula,we derive a robust factor which can transform the robust multiuser MIMO scheduling problem into the traditional one,thus most existing non-robust scheduling algorithms can be robust if this factor is *** results show that compared with the traditional algorithms,the proposed robust algorithms can improve the system average throughput significantly under the CSI error environment.

关键词： multiuser MIMO (MU-MIMO) scheduling robust imperfect CSI

Limit theorems for the weighted occupation time for super-Brownian motions on H~d

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Progress in Natural Science:Materials International 2006年第8期16卷 803-807页

作者： TANG Jiashan (College of Mathematics and Physics, Nanjing university of posts and telecommunications, Nanjing 210003. {3.) [a]College of Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing China

Weighted occupation time processes associated with the super-Brownian motions on hyperbolic spaces are investigated. Longtime behavior and a central limit type theorem for the processes are obtained. For all dimension d≥2, the right normings for two fluctuations are t and t1/2 , and the limit results are the Riemannian measure and some centered Gaussian random measure, respectively.

关键词： super-Brownian motion hyperbolic space occupation time process longtime behavior.

On the construction of multi-output Boolean functions with optimal algebraic immunity

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Science china(Information Sciences) 2012年第7期55卷 1617-1623页

作者： ZHANG Jie 1,2 ,SONG ShouChao 1 ,DU Jiao 2,3.& WEN QiaoYan 2 1 School of Science,Beijing university of posts and telecommunications,Beijing 100876,{3. 2 State Key Laboratory of Networking and Switching Technology,Beijing university of posts and telecommunications,Beijing 100876,{3. 3.Department of Mathematics,Xinxiang university,Xinxiang 453.03.{3. 1. School of Science Beijing University of Posts and Telecommunications Beijing 100876 China2. State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China3. Department of Mathematics Xinxiang University Xinxiang 453003 China

In this paper,we show a construction of multi-output Boolean functions with optimal algebraic ***,the relationship between the algebraic immunity of a multi-output Boolean function and those of its component functions is *** show that all the component functions,together with their nonzero linear combination,of the multi-output Boolean functions achieved by this construction have optimal algebraic immunity simultaneously.

关键词： algebraic immunity Boolean functions algebraic attacks annihilators

Distributed GEP query optimization on grid service

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The Journal of china Universities of posts and telecommunications 2010年第3期17卷 118-122,128页

作者： DENG Yong, WANG Ru-chuan College of Computer, Nanjing university of posts and telecommunications, Nanjing 210003. {3. [a] College of Computer Nanjing University of Posts telecommunications Nanjing 210003 China

In order to better solve the problem of distributed query optimization, a query optimization algorithm on gene expression programming （GEP）（QO-GEP） is presented. On the basis of QO-GEP, distributed GEP query optimization on grid service （DGEPQO-GS） is proposed which combines grid service. Simulated experiments show that with the increment of the number of query relation, query time which QO-GEP carries out query decreases apparently. Meanwhile, with the increase of the number of grid nodes, the average querying success rate of DGEPQO-GS increases significantly.

关键词： gene expression programming distributed query grid service query relation