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Bioinformatics analyses for signal transduction networks

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science china(Life sciences) 2008年第11期51卷 994-1002页

作者： LIU Wei1,2, LI Dong2, ZHU YunPing2 & HE FuChu1,2 1 College of Mechanical & electronic engineering and Automatization, national university of defense technology, changsha 4.0073, china 2 State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing 102206, china 1. College of Mechanical & electronic engineering and Automatization National University of Defense Technology Changsha 410073 China 2. State Key Laboratory of Proteomics Beijing Proteome Research Center Beijing Institute of Radiation Medicine Beijing 102206 China

Research in signaling networks contributes to a deeper understanding of organism living activities. With the development of experimental methods in the signal transduction field, more and more mechanisms of signaling pathways have been discovered. This paper introduces such popular bioin-formatics analysis methods for signaling networks as the common mechanism of signaling pathways and database resource on the Internet, summerizes the methods of analyzing the structural properties of networks, including structural Motif finding and automated pathways generation, and discusses the modeling and simulation of signaling networks in detail, as well as the research situation and tendency in this area. Now the investigation of signal transduction is developing from small-scale experiments to large-scale network analysis, and dynamic simulation of networks is closer to the real system. With the investigation going deeper than ever, the bioinformatics analysis of signal transduction would have immense space for development and application.

关键词： signal transduction structural motif automated pathways regeneration dynamics simulation

A GTD model and state space approach based method for extracting the UWB scattering center of moving target

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science china(Information sciences) 2011年第1期54卷 182-196页

作者： WANG Jun,WEI ShaoMing,SUN JinPing & MAO ShiYi school of electronic and Information engineering,Beihang university,Beijing 100191,china 1. school of electronic and Information engineering Beihang University Beijing 100191 China

Movements of the scattering center on the condition of ultra-wideband(UWB)will impact the extraction of *** paper presents an approach for extracting the moving targets’UWB scattering center parameters based on the geometrical theory of diffraction(GTD)model and the state space approach. Firstly,the UWB GTD scattering model is transformed into state-space equations in order to estimate the range and range rate through the singular value ***,the type parameter in the whole bandwidth is indicated dimension-reducedly by orthonormalized basis and estimated by traversal algorithm and minimumnorm ***,the intensity of scattering center is worked out based on the least square *** paper provides the Cramer-Rao bound(CRB)for parameter *** effectiveness of the approach is verified by computer *** approach can estimate range,range rate,reflection intensity and type parameter simultaneously in order to improve the track of scattering centers and the target identification.

关键词： scattering center extraction GTD model state space approach ultra-wideband Doppler processing

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,china 2 school of Information and Communication engineering,Beijing university of Posts and Telecommunications,Beijing 100876,china 3 Key Lab of Universal Wireless Communications,Ministry of Education,Beijing university of Posts and Telecommunications,Beijing 100876,china 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

A Second-Order Conjugate Augmented MUSIC Algorithm for Direction Finding

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A Second-Order Conjugate Augmented MUSIC Algorithm for Direc...

Effect of Asymmetry in a Bistable System Subject to Multiplicative Colored Noise

2006 CIE International Conference on Radar

作者： Jian Liu Hongqi Yu Zhitao Huang Yiyu Zhou school of electronic science and engineering national university of defense technology changsha 4.0073 P.R.china

A new direction finding algorithm called Second-Order Conjugate Augmented MUSIC （SO-CAM） is proposed in this *** basic idea of SO-CAM is to use the conjugate augmented cross-correlation to derive the pseudo-data matrix from which the pseudo covariance matrix is *** the directions of arrivals （DOAs） of the signals are estimated by MUSIC ***-CAM can resolve two times the number of DOAs when compared to MUSIC algorithm for uniform linear array （ULA）.Moreover,simulation results show that the resolution performance of SO-CAM algorithm is better than MUSIC and MUSIC-like in small sample case.

关键词： Array signal processing direction finding MUSIC aperture extension

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Communications in Theoretical Physics 2007年第12期48卷 1059-1062页

作者： ZHOU Yu-Rong~(1,2)GUO Feng~3 and PANG Xiao-Feng~1~1 school of Life science and technology,university of electronic science and technology of china,Chengdu 610054,china~2 school of Information and Electric engineering,Panzhihua university,Panzhihua 617000,china~3 school of Automation engineering,university of electronic science and technology of china,Chengdu 610054,china school of Life science and technology University of Electronic Science and Technology of China school of Information and Electric engineering Panzhihua University school of Automation engineering University of Electronic Science and Technology of Chi

By the method of the stochastic energetics,we investigate the stochastic resonance (SR) phenomenon of anoverdamped Brown particle in an asymmetric bistable potential,driven by external periodical signal and *** expressions have been obtained for the quasi-steady-state probability distribution *** is found thatthe input energy (IE) pumped into the system by the external driving shows an SR-like behavior as a function of thenoise strength,whereas the IE turns to be a monotonic function of the correlation time of the *** effect ofpotential asymmetry is also studied on SR and IE.

关键词： asymmetric bistable system stochastic resonance stochastic energetics

Electrical property of 8-mol% yttria-stabilized zirconia electrolyte by spark-plasma sintering

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science china(Technological sciences) 2004年第5期47卷 569-576页

作者： JIAN Jiawen1,2, CHANG Aimin3, YANG Bangchao2 & ZHANG Yikang4 1. The school of Information science engineering, Ningbo university, Ningbo 315211, china 2. The school of Microelectronics and Solid-state electronics, university of electronic science and Tech-nology of china, Chengdu 610054, china 3. The Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of sciences, Urumqi 830022, china 4. Hongtak (Chengdu) electronic Co., Ltd, Chengdu 610041, china Correspondence should be addressed to Jian Jiawen 1. The school of Information science engineering Ningbo University 315211 Ningbo China 2. The school of Microelectronics and Solid-state electronics University of Electronic Science and Technology of China 610054 Chengdu China 3. The Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences 830022 Urumqi China 4. Hongtak (Chengdu) electronic Co. Ltd 610041 Chengdu China

Spark-plasma sintering (SPS) process was used to sinter ZrO2 (8Y) powders, and a relative density of 99% has been reached at a low temperature (1350°C) and short dwelling time (10 min) compared to the conventional sintered identical samples (1450°C 4 h)(CS). By the X-ray diffraction (XRD) patterns, the microstructure of the SPS pellet and CS pellet are both indexed by the cubic unit cell (Fm3m). The finer crystallite size (D111) of the SPS pellet is 154 nm and D111 of the CS pellet is more than 1 μm. The AC impedance spectroscopy shows that the ionic conductivity of SPS pellet is different from that of CS pellet. The activation energy for the SPS ceramics, estimated from the slope in the range of 400–800°C, was 91 kJ mol?1, which is in good agreement with CS pellet (96 kJ mol?1), indicating that the conduction mechanism in SPS ceramics is similar to that in CS ceramics.

关键词： yttria-stabilized zirconia electrolyte, spark-plasma sintering, AC impedance.

A new approach for generating function sequences——Hybrid Bridge functions derived from Walsh functions

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Progress in Natural science:Materials International 2009年第9期19卷 1153-1158页

作者： Yan Li, Qing Chang*, Qishan Zhang school of electronic and Information engineering, Beihang university, Beijing 100083, china [a]school of electronic and Information engineering Beihang University Beijing 100083 China

This paper reviews the essence of the Walsh and Bridge functions from the point of view of the recursive relationship; it also unifies their expressions. A new kind of function-the hybrid Bridge function-is constructed from the definition of the hybrid matrix, in which the row vectors are taken from the Walsh and Bridge function matrices. We also propose a new approach for generating function sequences; one that uses the column vectors of the hybrid Bridge function matrix as the new function sequences. These sequences are able to adjust the number of zeroes flexibly; thus, resolving the constraint on the application of excessive zeroes in Bridge function sequences, while at the same time maximizing the research field for function sequences. Through strict mathematical analysis, it is proved that when the initial matrix order of the parent matrices and the similarity of the hybrid matrices meet certain conditions, the hybrid function sequences exhibit good orthogonal characteristics. This provides a theoretical basis for its further applications in communication systems.

关键词： Copy theory Walsh functions Bridge functions Hybrid Bridge functions

Fabrication of Ni_3Al by hot pressing from element powders

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Rare Metals 2007年第3期26卷 222-225页

作者： MENG Jie JIA Chengchang HE Qing school of Materials science and engineering University of Science and Technology Beijing Beijing 100083 China

Ni3Al intermetaUic was synthesized by hot pressing from element powders of nickel, aluminum, and boron. The influences of parameters on the properties of Ni3Al were investigated. The parameters include the particle size of nickel powder, adding or without boron powder, hot pressing temperature, etc. The properties include the density of hot-pressed samples, resultant redo of Ni3A1 phase, and bending strength. The microstructures of hot-pressed samples were investigated by X-ray diffraction and scan electronic microscopy, and the properties, such as density and bending strength, were also measured. The results show that a higher bending strength was obtained under the same hot pressing conditions by the fine nickel powder than the coarse one, and there is little difference about density. Boron powder added in this process accelerates the formation of Ni3Al and markedly increases the hot pressed density. In the temperature range of this study, the density increases along with the hot pressing temperature. Full dense Ni3Al samples were obtained under the condition of 860℃, 10 min, 45 MPa from Ni-22.89A1-0.5B powder.

关键词： Ni3Al intermetallics powder technology hot pressing.

Analysis of realizable rational decimated nonuniform filter banks with direct structure

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Progress in Natural science:Materials International 2008年第12期18卷 1501-1505页

作者： Xuemei Xie Lili Liang Guangming Shi school of electronic engineering,Xidian university,Xi’an 710071,china [a]school of electronic engineering Xidian University Xi’an 710071 China

In the design of nonuniform filter banks (NUFBs) with direct structure,the location of each analysis filter,corresponding to the sampling factor satisfying maximal decimation condition,should be set properly to avoid large *** this paper,a necessary and sufficient condition for the setting of the location of each analysis filter is *** NUFBs,we focus on,have rational decima- tion *** on the derived condition,the frequency support of each analysis filter for the realizable NUFBs can be determined directly in such a way that the analysis filters can extract the corresponding bands of the input *** provides a guideline for the design of NUFBs with direct structure in choosing proper locations of analysis filters.

关键词： Nonuniform filter banks Rational sampling factors Large aliasing Locations of analysis filters