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Search Results: 1 - 10 of 98242 matches for " Wu Zhen-Wei "
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BLIND SOURCE SEPARATION FOR FMRI SIGNALS USING A NEW INDEPENDENT COMPONENT ANALYSIS ALGORITHM
新的独立成分分析算法实现功能磁共振成像信号的盲分离

WU Zhen-hua,SHI Zhen-wei,TANG Huan-wen,TANG Yi-yuan,
武振华
,史振威,唐焕文,唐一源

生物物理学报 , 2004,
Abstract: In order to separate independent components (task-related signal and other noises) from functional magnetic reasonance imaging(fMRI)signals, a new independent component analysis algorithm was used. In contrast to fastICA, the algorithm reduced computation and raised speed of operation. It also separated independent components from fMRI signals very well.
Wheel-terrain Geometric Contact Angle Estimation of All-terrain Mobile Robots
全地形移动机器人轮-地几何接触角估计

SONG Xiao-Kang,WANG Yue-Chao,TAN Da-Long,WU Zhen-Wei,
宋小康
,王越超,谈大龙,吴镇炜

自动化学报 , 2008,
Abstract: 研究全地形移动机器人在不平坦地形中轮-地几何接触角的实时估计问题.本文以带有被动柔顺机构的六轮全地形移动机器人为对象,抛弃轮-地接触点位于车轮支撑臂延长线上这一假设,通过定义轮-地几何接触角δ来反映轮-地接触点在轮缘上位置的变化和地形不平坦给机器人运动带来的影响,将机器人看成是一个串-并联多刚体系统,基于速度闭链理论建立考虑地形不平坦和车轮滑移的机器人运动学模型,并针对轮-地几何接触角δ难以直接测量的问题,提出一种基于模型的卡尔曼滤波实时估计方法.利用卡尔曼滤波对机器人内部传感器的测量值进行噪声处理,基于机器人整体运动学模型对各个轮-地几何接触角进行实时估计,物理实验数据的处理结果验证了本文方法的有效性,从而为机器人运动学的精确计算和高质量的导航控制奠定了基础.
Estimation of Charge Exchange Recombination Emission Based on Diagnostic Neutral Beam on the Experimental Advanced Superconducting Tokamak
ZHANG Xian-Mei,WAN Bao-Nian,WU Zhen-Wei,
张先梅
,万宝年,吴振伟

中国物理快报 , 2007,
Abstract: Diagnostic neutral beam (DNB) attenuation and charge exchange recombination emission are estimated on EAST tokamak. Approximately 40% of the beam with the energy of 50 keV can reach the plasma centre (r = 0) for the typical parameters of the Experimental Advanced Superconducting Tokamak (EAST) plasma. Emissivities of CVI (n = 8 → 7, 529.0nm) and OVⅢ (n = 10 →9, 607.Ohm) visible charge exchange recombination emissions based on the DNB are estimated. The emissivities of the visible bremsstrahlung emission near this wavelength are also calculated for comparison. The results show that the charge exchange recombination emission is about two orders of magnitude greater than the bremsstrahlung emission. It is theoretically indicated that the ratio of signal of charge exchange recombination spectroscopy to the noise from background bremsstrahlung emission, S/N, is large enough in the EAST tokamak with the typical designed parameters. The present results are helpful for experiment design of charge-exchange recombination spectroscopy based on the DNB in the EAST tokamak.
The carbon impurity particle transport in ohmic discharges on the HT-7 tokamak
The carbon impurity ohmic discharges on particle transport in the HT-7 tokamak

Zhou Qian,Wan Bao-Nian,Wu Zhen-Wei,Huang Juan,
周倩
,万宝年,吴振伟,黄娟

中国物理 B , 2005,
Abstract: The line-integrated optical measurement of impurity radiation profiles for the study of light impurity transport is performed in the HT-7 tokamak. The carbon impurity line emissivity is obtained by Abel inversion. The radial transport behaviours of carbon impurities at different central line averaged electron densities \overline {n_\e} are investigated in ohmic discharges. The diffusion coefficient D_{k}(r), the convection velocity W_{k}(r) and the total flux of the impurity ions \Ga _{k} decrease with the increase of \overline {n_\e} , which shows a reduction in the impurity particle transport at higher electron densities.
Wireless Networked System and Application for the Navigation Mark Intelligent Monitoring Management
无线网络化航标监控系统及应用

WU Chun-xue,YU Zhen-wei,LI Guan-yu,
邬春学
,余镇危,李冠宇

计算机应用研究 , 2004,
Abstract: A wireless networked system for pharoses intelligent monitoring management,which is based on GSM/GPRS short message,is introduced.In the system,data collection and treatment are implemented by field computer,and the communication with management computer is done by wireless modem through GSM/GPRS net.The control center collects the data needed via management computer to monitor the pharoses remotely in wireless mode.
Single Machine Scheduling to Minimize Makespan with Bounded Linear Increasing Processing Time
WEN Zhen-wei,MO Ze
Journal of Chongqing Normal University , 2010,
Abstract: Traditional scheduling problems usually involve jobs with constant processing times. In this paper, a single machine scheduling problem 1 | p j(t) (t0, T1, T2) | Cmax is discussed, in which the processing time of a job is a bounded linear increasing function of its starting time. Each job in the job set J = {J1, J2, , Jn} is suppose to be processed on a single machine. The job set is partitioned into two subsets J = 1 + 2. The first job processed on the machine stars at time t0 > 0. The processing time of a job in 1 is pj(t) = ajt (if t < T1) or pj(t) = ajT1 (if t T1), and the processing time of a job in 2 is p j(t) = ajt (if t < T2) or pj(t) = ajT2 (if t T2), where T2 > T1 > t0 are all given constants, and t is the starting time of the job. The objective is to minimize the makespan Cmax. Based on Lemma 2 and Lemma 2 obtained, we show that this scheduling problem is polynomial time solvable and a polynomial time algorithm with complexity nlogn is proposed.
Study of particle behaviour at the edge in HT-7 tokamak
Xu Wei,Wan Bao-Nian,Zhou Qian,Wu Zhen-Wei,Mao Jiao-Shan,Li Jian-Gang,
徐伟
,万宝年,周倩,吴振伟,毛剑珊,李建刚

中国物理 B , 2004,
Abstract: The cross-field diffusion coefficient (D_⊥) at the edge in the HT-7 tokamak is close to the Bohm value when the line average electron density ranges from 1.5×10^{19} to 3.0×10^{19}m^{-3}. The energy profile of the particles is derived directly from the H_α(D_α) line shape; the dissociative excitation of molecules is dominating when the local electron temperature is above 10eV. By means of the Monte Carlo method the D_α line shape is also simulated. We find that the molecular dissociation contributes to 57% of neutral atoms and 53% of emission intensity in front of the limiter, and 85% of neutral atoms and 82% of emission intensity in front of the wall. The influence of atomic and molecular processes on the energy balance is discussed for the scrape-off layer (SOL), and the power loss from molecular dissociation is found to be 6×10^4kW at the SOL. The ion Bernstein wave (IBW) can effectively suppress the magnetohydrodynamic behaviour, the fluctuation levels and the turbulence; the D_⊥ in front of the limiter declines from 0.84 to 0.2m^2·s^{-1} and the particle confinement time rises from 9 to 12ms.
STUDY OF THE ELECTRON THERMAL CONDUCTIVITY OF THE OHMICALLY HEATED DISCHARGES IN THE HT-7 TOKAMAK
HT-7托卡马克等离子体欧姆放电时电子热扩散系数的研究

ZHANG XIAN-MEI,WAN BAO-NIAN,Ruan Huai-lin,WU Zhen-wei,HT-GROUP,
张先梅
,万宝年,阮怀林,吴振伟,HT-组

物理学报 , 2001,
Abstract: The electron thermal conductivity in the HT-7 tokamak is obtained by analyzing the electron power balance. In the HT-7 device, the electron thermal convection loss can be neglected, compared with ohmic input power, and the thermal conduction loss is the main energy loss mechanism. The electron thermal diffusion coefficient increases with the minor radius, and is about 100 times larger than the neo-classical theory calculation. After siliconization, the electron thermal diffusion coefficient decreases obviously at the outer half region, and the energy confinement time is prolonged.
A Survey of the Application-level Multicast
应用层组播综述*

LI Jun-sheng,YU Zhen-wei,PAN Yun,LI Xi,CAO Jian-hu,WU Pu-jun,
李珺晟
,余镇危,潘耘,李霞,曹建华,武浦军

计算机应用研究 , 2004,
Abstract: In order to accelerate the deployment and solve the existing problems of multicast,there has been proposed application-level multicast.It shifts the multicast ability from routers to the end hosts,therefore routers need not maintain the routing table and does not modify the infrastcture of the current network.The multicast function is easily fulfilled.This paper depicts the existing application-level multicast,evaluates and compares with them.In the end the prospect and the future work is discussed.
A New Doppler Shift Spectroscopy for Measurement of Neutral Beam Profile
SHI Yue-Jiang,WANG Guang-Qi,FU Jia,WU Zhen-Wei,CHANG Jia-Feng,SUN Dan-Peng,GAO Wei,HUANG Juan,ZHOU Qian,GAO Xiang,WAN Bao-Nian,
石跃江
,王光祺,符佳,吴振伟,常家峰,孙丹鹏,高伟,黄娟,周倩,高翔,万宝年

中国物理快报 , 2007,
Abstract: A new diagnostic based on Doppler shift is designed to measure the power profile of a hydrogen or deuterium neutral beam on the magnetic confined fusion machines. The interference filters and multi-channel photon detector array (PDA) are the main components of this diagnosis. The multi-channel PDA measures the line integrated Doppler Ha signal emitted by the neutral beam at one section in two directions. The local intensity of neutral beam can be obtained with the tomography technique. Compared to the conventional calorimeter diagnoses, this diagnosis can provide the beam profile without blocking the injection of neutral beam.
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